Merge branch 'metadata-fix' into 'master'

fix: multivalue tags

See merge request joelilas/filebrowser!2

.gitignore

@@ -37,3 +37,12 @@ build/
 
 default.nix
 Dockerfile.dev
+filebrowser.log
+filebrowser.pid
+frontend-dev.log
+frontend.pid
+SWAG.mp3
+test/M5.flac
+test/MALIBU.flac
+test/SWAG.mp3
+test

CHANGELOG.md

@@ -2,6 +2,25 @@
 
 All notable changes to this project will be documented in this file. See [commit-and-tag-version](https://github.com/absolute-version/commit-and-tag-version) for commit guidelines.
 
+## [2.57.0] (2026-01-28)
+
+
+### Features
+
+* Add "Modify metadata" action and modal for MP3/FLAC with batch edit support
+* Expose audio tags in API (GET /api/resources?metadata=1) and implement metadata updates (PATCH action=metadata)
+* Update i18n (EN/FR) with metadata labels and modal texts
+* Include ffmpeg in s6 Docker image to enable metadata writes in containers
+
+
+### Bug Fixes
+
+* Avoid 400/409 errors on metadata PATCH by skipping parent/stat checks when destination is empty
+* Preserve existing tags on update using ffmpeg `-map_metadata 0`; apply only non-empty fields; no-op when no changes
+* Use temp file with original extension for ffmpeg; capture stderr to improve error messages
+* Exclude raw APIC frames from returned tags to prevent large payloads; keep preview-friendly picture key
+* Modal polish: fix column alignment jitter and title capitalization
+
 ## [2.56.0](https://github.com/filebrowser/filebrowser/compare/v2.55.0...v2.56.0) (2026-01-24)
 
 

Dockerfile.full

@@ -0,0 +1,86 @@
+# Multi-stage build: compile frontend + backend, then package
+# This is a full build Dockerfile for filebrowser from source
+
+##############################################################################
+# Stage 1: Build frontend (Node.js / pnpm)
+##############################################################################
+FROM node:20-alpine AS frontend-builder
+
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+
+COPY frontend/ ./
+RUN pnpm run build
+
+##############################################################################
+# Stage 2: Build backend (Go)
+##############################################################################
+FROM golang:1.25-alpine AS backend-builder
+
+RUN apk add --no-cache git
+
+WORKDIR /app
+COPY . .
+COPY --from=frontend-builder /app/frontend/dist ./frontend/dist
+
+RUN go mod tidy && go mod download
+
+ARG VERSION=dev
+ARG GIT_COMMIT=unknown
+
+RUN CGO_ENABLED=0 go build \
+    -ldflags="-s -w -X 'github.com/filebrowser/filebrowser/v2/version.Version=${VERSION}' -X 'github.com/filebrowser/filebrowser/v2/version.CommitSHA=${GIT_COMMIT}'" \
+    -o filebrowser .
+
+##############################################################################
+# Stage 3: Fetch runtime dependencies
+##############################################################################
+FROM alpine:3.23 AS fetcher
+
+RUN apk update && \
+    apk --no-cache add ca-certificates mailcap tini-static && \
+    wget -O /JSON.sh https://raw.githubusercontent.com/dominictarr/JSON.sh/0d5e5c77365f63809bf6e77ef44a1f34b0e05840/JSON.sh
+
+##############################################################################
+# Stage 4: Final runtime image (Alpine with ffmpeg)
+##############################################################################
+FROM alpine:3.23
+
+ENV UID=1000
+ENV GID=1000
+
+RUN addgroup -g $GID user && \
+    adduser -D -u $UID -G user user && \
+    apk add --no-cache ffmpeg flac
+
+# Copy compiled binary from backend-builder
+COPY --from=backend-builder --chown=user:user /app/filebrowser /bin/filebrowser
+
+# Copy scripts and configs from repo
+COPY --chown=user:user docker/common/ /
+COPY --chown=user:user docker/alpine/ /
+
+# Copy runtime deps from fetcher
+COPY --chown=user:user --from=fetcher /sbin/tini-static /bin/tini
+COPY --from=fetcher /JSON.sh /JSON.sh
+COPY --from=fetcher /etc/ca-certificates.conf /etc/ca-certificates.conf
+COPY --from=fetcher /etc/ca-certificates /etc/ca-certificates
+COPY --from=fetcher /etc/mime.types /etc/mime.types
+COPY --from=fetcher /etc/ssl /etc/ssl
+
+RUN mkdir -p /config /database /srv && \
+    chown -R user:user /config /database /srv && \
+    chmod +x /healthcheck.sh
+
+HEALTHCHECK --start-period=2s --interval=5s --timeout=3s CMD /healthcheck.sh
+
+USER user
+
+VOLUME /srv /config /database
+
+EXPOSE 80
+
+ENTRYPOINT [ "tini", "--", "/init.sh" ]

Dockerfile.s6

@@ -1,7 +1,7 @@
 FROM ghcr.io/linuxserver/baseimage-alpine:3.23
 
 RUN apk update && \
-  apk --no-cache add ca-certificates mailcap jq libcap
+  apk --no-cache add ca-certificates mailcap jq libcap ffmpeg
 
 # Make user and create necessary directories
 RUN mkdir -p /config /database /srv && \

README.md

@@ -28,3 +28,4 @@ Contributions are always welcome. To start contributing to this project, read ou
 ## License
 
 [Apache License 2.0](LICENSE) © File Browser Contributors
+# Work in progress: metadata modifier

files/file.go

@@ -48,6 +48,8 @@ type FileInfo struct {
 	Subtitles []string          `json:"subtitles,omitempty"`
 	Content   string            `json:"content,omitempty"`
 	Checksums map[string]string `json:"checksums,omitempty"`
+	// Tags holds audio metadata (ID3, VorbisComment, MP4 tags, ...)
+	Tags       map[string]interface{} `json:"tags,omitempty"`
 	Token      string                 `json:"token,omitempty"`
 	currentDir []os.FileInfo          `json:"-"`
 	Resolution *ImageResolution       `json:"resolution,omitempty"`

files/tags.go

@@ -0,0 +1,221 @@
+package files
+
+import (
+	"bytes"
+	"encoding/base64"
+	"io"
+	"log"
+	"os/exec"
+	"path/filepath"
+	"strings"
+
+	"github.com/dhowden/tag"
+)
+
+// ReadAudioTags extracts common audio metadata from the file and stores it in
+// the FileInfo.Tags map. It attempts to extract common fields and includes
+// embedded picture(s) as base64 where present.
+// Multi-valued tags like ARTISTS and ALBUMARTISTS are extracted as arrays.
+func (i *FileInfo) ReadAudioTags() error {
+	if i.IsDir {
+		return nil
+	}
+
+	f, err := i.Fs.Open(i.Path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	m, err := tag.ReadFrom(f)
+	if err != nil {
+		// don't fail hard; log and return nil so callers still get file info
+		log.Printf("ReadAudioTags: failed to read tags for %s: %v", i.Path, err)
+		return nil
+	}
+
+	tags := map[string]interface{}{}
+
+	if v := m.Title(); v != "" {
+		tags["title"] = v
+	}
+	if v := m.Album(); v != "" {
+		tags["album"] = v
+	}
+	if v := m.Artist(); v != "" {
+		tags["artist"] = v
+	}
+	if v := m.AlbumArtist(); v != "" {
+		tags["albumartist"] = v
+	}
+	if v := m.Composer(); v != "" {
+		tags["composer"] = v
+	}
+	if v := m.Year(); v != 0 {
+		tags["year"] = v
+	}
+	if t, _ := m.Track(); t > 0 {
+		tags["track"] = t
+	}
+	if dnum, _ := m.Disc(); dnum > 0 {
+		tags["disc"] = dnum
+	}
+	if v := m.Genre(); v != "" {
+		tags["genre"] = v
+	}
+
+	// Pictures: encode as data URI (base64) so frontend can preview if needed.
+	if pic := m.Picture(); pic != nil {
+		// safe encode image bytes as base64
+		var buf bytes.Buffer
+		if _, err := io.Copy(&buf, bytes.NewReader(pic.Data)); err == nil {
+			b64 := base64.StdEncoding.EncodeToString(buf.Bytes())
+			dataURI := "data:" + pic.MIMEType + ";base64," + b64
+			tags["picture"] = map[string]interface{}{
+				"mime": pic.MIMEType,
+				"data": dataURI,
+			}
+		}
+	}
+
+	// Keep raw metadata map if available (some formats expose additional fields)
+	// Also extract multi-valued tags like ARTISTS and ALBUMARTISTS
+	if raw := m.Raw(); raw != nil {
+		// First pass: collect multi-valued tags (ARTISTS, ALBUMARTISTS)
+		artists := extractMultiValuedTag(raw, "ARTISTS", "artists")
+		albumArtists := extractMultiValuedTag(raw, "ALBUMARTISTS", "albumartists")
+
+		// Store multi-valued tags as arrays if present
+		if len(artists) > 0 {
+			tags["artists"] = artists
+		}
+		if len(albumArtists) > 0 {
+			tags["albumartists"] = albumArtists
+		}
+
+		for k, v := range raw {
+			// Skip raw APIC entries (attached picture frame) to avoid
+			// exposing large binary blobs. We already expose a friendly
+			// `picture` key above when a picture exists.
+			if strings.EqualFold(k, "APIC") {
+				continue
+			}
+			// Skip multi-valued tags we already handled
+			kLower := strings.ToLower(k)
+			if kLower == "artists" || kLower == "albumartists" {
+				continue
+			}
+			// avoid overwriting already set common fields
+			if _, ok := tags[k]; !ok {
+				tags[k] = v
+			}
+		}
+	}
+
+	// For FLAC files, use metaflac to read multi-valued tags properly
+	// since dhowden/tag doesn't handle them correctly
+	if realPath := i.RealPath(); realPath != "" && strings.EqualFold(filepath.Ext(realPath), ".flac") {
+		if multiTags := readMultiValuedTagsWithMetaflac(realPath); multiTags != nil {
+			if artists, ok := multiTags["ARTISTS"]; ok && len(artists) > 0 {
+				tags["artists"] = artists
+			}
+			if albumArtists, ok := multiTags["ALBUMARTISTS"]; ok && len(albumArtists) > 0 {
+				tags["albumartists"] = albumArtists
+			}
+		}
+	}
+
+	// Attach tags map
+	if len(tags) > 0 {
+		i.Tags = tags
+	}
+
+	return nil
+}
+
+// extractMultiValuedTag extracts values for a multi-valued tag from raw metadata.
+// It handles both Vorbis-style (multiple entries with same key) and ID3-style
+// (single string that may need splitting) formats.
+func extractMultiValuedTag(raw map[string]interface{}, keys ...string) []string {
+	var result []string
+	seen := make(map[string]bool)
+
+	for _, key := range keys {
+		for rawKey, rawVal := range raw {
+			if !strings.EqualFold(rawKey, key) {
+				continue
+			}
+			// Handle different value types returned by the tag library
+			switch v := rawVal.(type) {
+			case string:
+				v = strings.TrimSpace(v)
+				if v != "" && !seen[v] {
+					result = append(result, v)
+					seen[v] = true
+				}
+			case []string:
+				for _, s := range v {
+					s = strings.TrimSpace(s)
+					if s != "" && !seen[s] {
+						result = append(result, s)
+						seen[s] = true
+					}
+				}
+			case []interface{}:
+				for _, item := range v {
+					if s, ok := item.(string); ok {
+						s = strings.TrimSpace(s)
+						if s != "" && !seen[s] {
+							result = append(result, s)
+							seen[s] = true
+						}
+					}
+				}
+			}
+		}
+	}
+	return result
+}
+
+// readMultiValuedTagsWithMetaflac uses metaflac to read Vorbis comments from FLAC files.
+// This properly handles multi-valued tags (multiple entries with same key).
+func readMultiValuedTagsWithMetaflac(filepath string) map[string][]string {
+	if _, err := exec.LookPath("metaflac"); err != nil {
+		return nil
+	}
+
+	// Use metaflac to export all tags
+	cmd := exec.Command("metaflac", "--export-tags-to=-", filepath)
+	out, err := cmd.Output()
+	if err != nil {
+		log.Printf("metaflac export failed for %s: %v", filepath, err)
+		return nil
+	}
+
+	// Parse output: each line is TAG=VALUE
+	result := make(map[string][]string)
+	for _, line := range strings.Split(string(out), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		idx := strings.Index(line, "=")
+		if idx < 0 {
+			continue
+		}
+		key := strings.ToUpper(strings.TrimSpace(line[:idx]))
+		value := strings.TrimSpace(line[idx+1:])
+		if value == "" {
+			continue
+		}
+		// Collect multi-valued artist tags (ARTISTS, ARTIST, ALBUMARTISTS)
+		// Normalize key variations
+		if key == "ARTISTS" || key == "ARTIST" {
+			result["ARTISTS"] = append(result["ARTISTS"], value)
+		} else if key == "ALBUMARTISTS" || key == "ALBUMARTIST" || key == "ALBUM ARTIST" || key == "ALBUM_ARTIST" {
+			result["ALBUMARTISTS"] = append(result["ALBUMARTISTS"], value)
+		}
+	}
+
+	return result
+}

files/write_mp3.go

@@ -0,0 +1,7 @@
+package files
+
+// This file is a placeholder to avoid accidental module resolution for
+// non-implemented MP3 metadata writers. The actual implementation is not
+// required at runtime, and we should not import external packages here.
+
+// Intentionally left blank.

frontend/src/api/files.ts

@@ -188,6 +188,38 @@ export async function checksum(url: string, algo: ChecksumAlg) {
   return (await data.json()).checksums[algo];
 }
 
+export async function metadata(url: string) {
+  // Fetch metadata for a resource. Backend support is required for this to work.
+  const res = await resourceAction(`${url}?metadata=1`, "GET");
+  try {
+    const data = await res.json();
+    // backend returns a FileInfo object; prefer returning the audio tags map when present
+    if (data && typeof data === "object" && data.tags) {
+      return data.tags;
+    }
+    // fallback: if server returned just the tags map or other structure
+    return data;
+  } catch (e) {
+    return null;
+  }
+}
+
+import { normalizeChanges, normalizeMixedChanges } from "@/utils/metadata";
+
+export async function updateMetadata(url: string, content: any) {
+  // Update metadata for a resource. Backend must support PATCH with action=metadata.
+  // Normalize outgoing changes to canonical keys so backend gets stable names, preserving arrays for multi-valued tags.
+  if (content && content.__clear__) {
+    const clear = content.__clear__;
+    const { __clear__, ...rest } = content;
+    content = normalizeMixedChanges(rest || {});
+    content.__clear__ = clear;
+  } else {
+    content = normalizeMixedChanges(content || {});
+  }
+  return resourceAction(`${url}?action=metadata`, "PATCH", JSON.stringify(content));
+}
+
 export function getDownloadURL(file: ResourceItem, inline: any) {
   const params = {
     ...(inline && { inline: "true" }),

frontend/src/components/prompts/ModifyMetadata.vue

@@ -0,0 +1,834 @@
+<template>
+  <div class="card floating metadata-card">
+    <div class="card-title title-with-actions">
+      <h2>{{ trans('files.metadata','Metadata') }}</h2>
+      <div class="title-actions">
+        <button
+          type="button"
+          class="button button--flat"
+          @click="toggleAddField"
+          :aria-label="trans('buttons.addField','Add field')"
+          :title="trans('buttons.addField','Add field')"
+        >
+          {{ trans('buttons.addField','Add field') }}
+        </button>
+        <button
+          type="button"
+          class="button button--primary"
+          @click.prevent="applyAll"
+          :aria-label="trans('buttons.apply','Apply')"
+          :title="trans('buttons.apply','Apply')"
+        >
+          {{ trans('buttons.apply','Apply') }}
+        </button>
+      </div>
+    </div>
+
+    <div class="card-content">
+      <p v-if="selectedCount > 1">
+        {{ $t('prompts.filesSelected', { count: selectedCount }) }}
+      </p>
+
+      <template v-if="selectedCount === 0">
+        <p>{{ $t('prompts.noFileSelected') }}</p>
+      </template>
+
+      <template v-else>
+        <div v-if="addFieldVisible" class="add-field-row">
+          <div class="add-field-controls">
+            <input
+              v-model="addFieldKey"
+              type="text"
+              :placeholder="trans('prompts.newFieldName','Field name')"
+              list="tag-suggestions"
+            />
+            <datalist id="tag-suggestions">
+              <option v-for="s in tagSuggestions" :key="s" :value="s">{{ s }}</option>
+            </datalist>
+            <input
+              v-model="addFieldValue"
+              type="text"
+              :placeholder="trans('prompts.newFieldValue','Value')"
+            />
+            <button
+              type="button"
+              class="button button--primary"
+              @click="confirmAddField"
+              :aria-label="trans('buttons.add','Add')"
+              :title="trans('buttons.add','Add')"
+            >
+              {{ trans('buttons.add','Add') }}
+            </button>
+            <button
+              type="button"
+              class="button button--flat"
+              @click="cancelAddField"
+            >
+              {{ trans('buttons.cancel','Cancel') }}
+            </button>
+          </div>
+        </div>
+        <div class="metadata-table-wrapper">
+          <table class="metadata-table">
+            <colgroup>
+              <col class="col-label" />
+              <col class="col-current" />
+              <col class="col-new" />
+            </colgroup>
+            <thead>
+              <tr>
+                <th class="hdr-field">{{ trans('prompts.field','Field') }}</th>
+                <th class="hdr-current">{{ trans('prompts.current','Current') }}</th>
+                <th class="hdr-new">{{ trans('prompts.new','New') }}</th>
+              </tr>
+            </thead>
+            <tbody>
+              <tr v-for="field in fields" :key="field" class="metadata-row">
+                <td class="metadata-title">
+                  <strong>{{ fieldLabel(field) }}</strong>
+                  <span v-if="isMultiValued(field)" class="multi-value-hint">{{ trans('prompts.multiValueHint','(multi-valued)') }}</span>
+                </td>
+                <td class="metadata-current">
+                  <template v-if="isPicture(field)">
+                    <img :src="pictureSrc(field)" alt="cover" class="cover-preview" v-if="pictureSrc(field)" />
+                    <span v-else class="metadata-muted">{{ trans('prompts.noCover','No cover') }}</span>
+                  </template>
+                  <template v-else-if="isMultiValued(field)">
+                    <div class="multi-value-display">
+                      <div v-for="(val, idx) in displayCurrentArray(field)" :key="idx" class="multi-value-item">
+                        {{ val }}
+                      </div>
+                      <span v-if="displayCurrentArray(field).length === 0" class="metadata-muted">—</span>
+                    </div>
+                  </template>
+                  <template v-else>
+                    {{ displayCurrent(field) }}
+                  </template>
+                </td>
+                <td class="metadata-edit-cell">
+                  <div class="edit-with-actions">
+                    <template v-if="isMultiValued(field)">
+                      <div class="multi-value-editor">
+                        <div v-for="(val, idx) in getMultiValueEntries(field)" :key="idx" class="multi-value-entry">
+                          <input
+                            :value="val"
+                            @input="updateMultiValueEntry(field, idx, $event.target.value)"
+                            :placeholder="trans('prompts.artistName','Artist name')"
+                            type="text"
+                            class="multi-value-input"
+                          />
+                          <button
+                            type="button"
+                            class="button button--flat button--red icon-button mini-button"
+                            :aria-label="trans('buttons.removeEntry','Remove')"
+                            :title="trans('buttons.removeEntry','Remove')"
+                            @click="removeMultiValueEntry(field, idx)"
+                          >
+                            <i class="material-icons">close</i>
+                          </button>
+                        </div>
+                        <button
+                          type="button"
+                          class="button button--flat button--small add-entry-btn"
+                          @click="addMultiValueEntry(field)"
+                        >
+                          <i class="material-icons">add</i>
+                          {{ trans('buttons.addEntry','Add entry') }}
+                        </button>
+                      </div>
+                    </template>
+                    <template v-else>
+                      <input
+                        v-model="newValues[field]"
+                        :placeholder="placeholders[field] || ''"
+                        type="text"
+                      />
+                    </template>
+                    <button
+                      type="button"
+                      class="button button--flat button--red icon-button"
+                      :aria-label="trans('buttons.remove','Remove field')"
+                      :title="trans('buttons.remove','Remove field')"
+                      @click="removeField(field)"
+                    >
+                      <i class="material-icons">delete</i>
+                    </button>
+                  </div>
+                </td>
+              </tr>
+            </tbody>
+          </table>
+        </div>
+      </template>
+    </div>
+
+    <div class="card-action">
+      <button
+        id="focus-prompt"
+        type="button"
+        @click="closeHovers"
+        class="button button--flat"
+        :aria-label="trans('buttons.ok','OK')"
+        :title="trans('buttons.ok','OK')"
+      >
+        {{ trans('buttons.ok','OK') }}
+      </button>
+
+      <button
+        id="apply-metadata"
+        type="button"
+        @click.prevent="applyAll"
+        class="button button--primary"
+        :aria-label="trans('buttons.apply','Apply')"
+        :title="trans('buttons.apply','Apply')"
+      >
+        {{ trans('buttons.apply','Apply') }}
+      </button>
+    </div>
+  </div>
+</template>
+
+<script>
+import { mapActions, mapState } from "pinia";
+import { useFileStore } from "@/stores/file";
+import { useLayoutStore } from "@/stores/layout";
+import { metadata as apiMetadata, updateMetadata } from "@/api/files";
+import { fieldLabelFor, normalizeChanges, canonicalizeKeys, canonicalizeKey, navidromeTags, isMultiValuedTag, isMultiValuedKey, splitMultiValues, normalizeMixedChanges, formatMultiValueDisplay, parseMultiValueInput } from "@/utils/metadata";
+
+export default {
+  name: "modifyMetadata",
+  inject: ["$showError"],
+    data() {
+      return {
+        // fields will be derived dynamically from metadata across selected files
+        fields: [],
+        fieldLabels: {},
+        placeholders: {},
+        metadataList: [],
+        newValues: {},
+          toClear: new Set(),
+        // add field UI state
+        addFieldVisible: false,
+        addFieldKey: "",
+        addFieldValue: "",
+        tagSuggestions: navidromeTags,
+      };
+    },
+  computed: {
+    ...mapState(useFileStore, ["req", "selected", "selectedCount"]),
+  },
+  methods: {
+    ...mapActions(useLayoutStore, ["closeHovers"]),
+    fieldLabel(key) {
+      return fieldLabelFor(key);
+    },
+    async mountedFetch() {
+      if (!this.req) return;
+
+      const files = this.selected.map((i) => this.req.items[i].url);
+
+      // Fetch metadata for each selected file if possible
+      try {
+        const promises = files.map((u) => apiMetadata(u));
+        this.metadataList = (await Promise.all(promises)).map((m) => m || {});
+      } catch (e) {
+        this.metadataList = [];
+      }
+
+      // Build union of fields
+      const keys = new Set();
+      this.metadataList.forEach((m) => {
+        Object.keys(m).forEach((k) => keys.add(k));
+      });
+
+      // Ensure stable ordering: put common fields first (including multi-valued artists/albumartists)
+      const preferred = ["title", "artist", "artists", "album", "track", "genre", "date", "comment", "disc", "composer", "year", "albumartist", "albumartists", "picture", "cover"];
+      const rest = Array.from(keys).filter((k) => !preferred.includes(k)).sort();
+      this.fields = preferred.filter((k) => keys.has(k)).concat(rest);
+
+      // Setup field labels (use translation when available, otherwise humanize)
+      // For multi-valued fields, initialize newValues appropriately
+      this.fields.forEach((f) => {
+        this.fieldLabels[f] = this.trans(`prompts.${f}`, this.humanize(f));
+        if (isMultiValuedKey(f)) {
+          // Initialize with current values or empty array
+          const current = this.getCurrentMultiValues(f);
+          this.newValues[f] = current.length > 0 ? [...current] : [];
+        } else {
+          this.newValues[f] = "";
+        }
+      });
+    },
+    // Get current multi-values directly from metadataList (for initialization)
+    getCurrentMultiValues(field) {
+      if (!this.metadataList || this.metadataList.length === 0) return [];
+      const allValues = [];
+      const seen = new Set();
+      for (const m of this.metadataList) {
+        const v = m[field];
+        if (Array.isArray(v)) {
+          for (const item of v) {
+            const s = String(item || '').trim();
+            if (s && !seen.has(s)) {
+              allValues.push(s);
+              seen.add(s);
+            }
+          }
+        } else if (v !== undefined && v !== null) {
+          const s = String(v).trim();
+          if (s && !seen.has(s)) {
+            allValues.push(s);
+            seen.add(s);
+          }
+        }
+      }
+      return allValues;
+    },
+    toggleAddField() {
+      this.addFieldVisible = !this.addFieldVisible;
+      if (this.addFieldVisible) {
+        this.addFieldKey = "";
+        this.addFieldValue = "";
+      }
+    },
+    cancelAddField() {
+      this.addFieldVisible = false;
+      this.addFieldKey = "";
+      this.addFieldValue = "";
+    },
+    confirmAddField() {
+      const key = String(this.addFieldKey || "").trim();
+      const val = String(this.addFieldValue || "").trim();
+      if (!key) return;
+      // If field doesn't exist yet, add it to the top for visibility
+      if (!this.fields.includes(key)) {
+        this.fields.unshift(key);
+        // keep labels in English technical form
+        // label is computed via fieldLabel()
+      }
+      // Initialize newValues entry and set initial value if provided
+      if (isMultiValuedTag(canonicalizeKey(key))) {
+        // For multi-valued tags, initialize as array
+        if (val) {
+          this.newValues[key] = splitMultiValues(val);
+        } else {
+          this.newValues[key] = [''];
+        }
+      } else {
+        if (!(key in this.newValues)) this.newValues[key] = "";
+        if (val !== "") this.newValues[key] = val;
+      }
+      this.cancelAddField();
+    },
+    // Check if a field is multi-valued (ARTISTS, ALBUMARTISTS)
+    isMultiValued(field) {
+      return isMultiValuedKey(field);
+    },
+    // Get current values as array for multi-valued display
+    displayCurrentArray(field) {
+      return this.getCurrentMultiValues(field);
+    },
+    // Get entries for editing multi-valued field
+    getMultiValueEntries(field) {
+      const val = this.newValues[field];
+      if (Array.isArray(val)) {
+        return val;
+      }
+      // Initialize from current if not yet edited
+      if (!val || val === '') {
+        const current = this.getCurrentMultiValues(field);
+        if (current.length > 0) {
+          this.newValues[field] = [...current];
+          return this.newValues[field];
+        }
+        // Return empty array with one entry for new field
+        this.newValues[field] = [''];
+        return this.newValues[field];
+      }
+      // Handle legacy string format
+      const arr = splitMultiValues(String(val));
+      this.newValues[field] = arr.length > 0 ? arr : [''];
+      return this.newValues[field];
+    },
+    // Update a single entry in a multi-valued field
+    updateMultiValueEntry(field, index, value) {
+      if (!Array.isArray(this.newValues[field])) {
+        this.newValues[field] = this.getMultiValueEntries(field);
+      }
+      this.newValues[field][index] = value;
+    },
+    // Remove an entry from a multi-valued field
+    removeMultiValueEntry(field, index) {
+      if (!Array.isArray(this.newValues[field])) {
+        this.newValues[field] = this.getMultiValueEntries(field);
+      }
+      this.newValues[field].splice(index, 1);
+      // Keep at least one empty entry for UX
+      if (this.newValues[field].length === 0) {
+        this.newValues[field] = [''];
+      }
+    },
+    // Add a new entry to a multi-valued field
+    addMultiValueEntry(field) {
+      if (!Array.isArray(this.newValues[field])) {
+        this.newValues[field] = this.getMultiValueEntries(field);
+      }
+      this.newValues[field].push('');
+    },
+    removeField(field) {
+      // Remove an added or existing field from the edit list (UI only)
+      this.fields = this.fields.filter((f) => f !== field);
+      delete this.newValues[field];
+      delete this.placeholders[field];
+      delete this.fieldLabels[field];
+      // Mark field for clearing on apply
+      const canon = canonicalizeKey(field);
+      this.toClear.add(canon);
+    },
+    displayCurrent(field) {
+      if (!this.metadataList || this.metadataList.length === 0) return "";
+
+      const vals = this.metadataList.map((m) => {
+        const v = m[field];
+        if (v === undefined || v === null) return "";
+        if (typeof v === "object") return JSON.stringify(v);
+        return String(v);
+      });
+
+  const nonEmpty = vals.filter((v) => v !== "");
+      if (nonEmpty.length === 0) return "";
+
+      const allEqual = nonEmpty.every((v) => v === nonEmpty[0]);
+      if (allEqual) return nonEmpty[0];
+
+      // Count how many distinct values
+      const distinct = new Set(nonEmpty);
+      // If fields are objects (e.g., picture) avoid returning huge JSON blobs.
+      // Prefer a short summary.
+      const sample = nonEmpty[0];
+      if (typeof sample === 'string') {
+        return this.trans('prompts.multipleValuesCount', `(different on ${distinct.size} files)`).replace('{count}', String(distinct.size));
+      }
+
+      try {
+        const s = JSON.stringify(sample);
+        return s.length > 200 ? s.slice(0, 200) + '…' : s;
+      } catch (e) {
+        return this.trans('prompts.multipleValuesCount', `(different on ${distinct.size} files)`).replace('{count}', String(distinct.size));
+      }
+    },
+
+    isPicture(field) {
+      if (!this.metadataList || this.metadataList.length === 0) return false;
+      for (const m of this.metadataList) {
+        const v = m[field];
+        if (v && typeof v === 'object') {
+          if (v.data && typeof v.data === 'string') return true;
+          if (v.picture && v.picture.data) return true;
+        }
+      }
+      return false;
+    },
+
+    pictureSrc(field) {
+      if (!this.metadataList) return null;
+      for (const m of this.metadataList) {
+        const v = m[field];
+        if (v && typeof v === 'object') {
+          if (v.data && typeof v.data === 'string') return v.data;
+          if (v.picture && v.picture.data) return v.picture.data;
+          // sometimes library stores a raw buffer as base64 directly in 'data'
+        }
+      }
+      return null;
+    },
+    trans(key, fallback) {
+      // Fallback to a human readable string if translation key is missing
+      try {
+        if (this.$te && this.$te(key)) return this.$t(key);
+      } catch (e) {
+        // ignore
+      }
+      return fallback;
+    },
+
+    humanize(str) {
+      if (!str) return str;
+      // replace camelCase / snake_case / dots with spaces and capitalize
+      const s = String(str)
+        .replace(/([a-z0-9])([A-Z])/g, "$1 $2")
+        .replace(/[_\.\-]+/g, " ");
+      return s.charAt(0).toUpperCase() + s.slice(1);
+    },
+
+    async applyAll() {
+      if (!this.req) return;
+
+      // collect changed fields
+      const changes = {};
+      Object.keys(this.newValues).forEach((k) => {
+        const v = this.newValues[k];
+        const canon = canonicalizeKey(k);
+        if (isMultiValuedTag(canon)) {
+          // For multi-valued tags, filter out empty entries
+          let arr = Array.isArray(v) ? v : splitMultiValues(String(v || ""));
+          arr = arr.map(s => String(s || '').trim()).filter(Boolean);
+          if (arr.length > 0) changes[canon] = arr;
+        } else if (v !== undefined && v !== null && String(v).trim() !== "") {
+          changes[canon] = v;
+        }
+      });
+
+      // If no value changes but some fields were removed, proceed
+      const hasValueChanges = Object.keys(changes).length > 0;
+      const hasClears = this.toClear && this.toClear.size > 0;
+      if (!hasValueChanges && !hasClears) {
+        return;
+      }
+
+      const files = this.selected.map((i) => this.req.items[i].url);
+
+      try {
+        // apply changes to each file
+        // Normalize keys on client before sending
+        const toSend = normalizeMixedChanges(changes);
+        // Attach clear list (canonicalized) so backend can remove tags
+        toSend.__clear__ = canonicalizeKeys(Array.from(this.toClear));
+        await Promise.all(files.map((u) => updateMetadata(u, toSend)));
+        // refresh listing
+        const fileStore = useFileStore();
+        fileStore.reload = true;
+        this.closeHovers();
+        this.toClear = new Set();
+      } catch (e) {
+        this.$showError(e);
+      }
+    },
+    // per-field apply removed in favor of global applyAll
+  },
+  mounted() {
+    this.mountedFetch();
+  },
+};
+</script>
+
+<style scoped>
+.metadata-card {
+  max-height: calc(100vh - 120px);
+  display: flex;
+  flex-direction: column;
+  box-sizing: border-box;
+  /* prefer a wider layout on large screens but stay responsive */
+  /* increase target width to give more horizontal space */
+  width: min(1400px, 98vw);
+  max-width: 98vw;
+  min-width: 680px;
+  border-radius: 12px;
+  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
+}
+
+.title-with-actions {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+}
+.title-actions {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.add-field-row {
+  padding: 0 1rem 0.5rem 1rem;
+}
+.add-field-controls {
+  display: flex;
+  gap: 0.5rem;
+}
+.add-field-controls input {
+  flex: 1 1 auto;
+}
+
+/* Override global small max-width for floating cards for this metadata modal */
+.card.floating.metadata-card {
+  /* remove the global max-width:25em constraint */
+  max-width: none !important;
+  width: min(1400px, 98vw) !important;
+  left: 50% !important;
+  transform: translate(-50%, -50%) !important;
+}
+.metadata-field {
+  margin-bottom: 1rem;
+}
+.metadata-title {
+  margin: 0.25rem 0;
+}
+.metadata-current {
+  color: var(--color-muted, #666);
+  margin: 0.25rem 0 0.5rem 0;
+}
+.metadata-edit {
+  display: flex;
+  gap: 0.5rem;
+}
+.metadata-edit input {
+  flex: 1 1 auto;
+}
+
+.edit-with-actions {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.icon-button {
+  padding: 0.25em 0.4em;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+}
+.icon-button .material-icons {
+  font-size: 18px;
+  line-height: 1;
+}
+
+.metadata-table-wrapper {
+  overflow-x: auto;
+  width: 100%;
+  padding: 0 1rem; /* add horizontal padding so left column isn't flush to modal edge */
+}
+.metadata-table {
+  border-collapse: separate;
+  width: auto; /* allow table to size to content */
+  /* allow a comfortable minimum width for readable columns on very large screens
+     but let it shrink responsively in smaller viewports */
+  min-width: 0;
+  max-width: 100%;
+  table-layout: auto;
+  border-spacing: 0;
+  border: 1px solid rgba(0,0,0,0.08);
+  border-radius: 10px;
+  overflow: hidden;
+}
+.metadata-table td, .metadata-table th { word-break: break-word; }
+.metadata-table th,
+.metadata-table td {
+  border: none;
+  padding: 0.75rem;
+  text-align: left;
+  vertical-align: top;
+}
+
+/* Header styling: subtle background and divider */
+.metadata-table thead {
+  background: rgba(0,0,0,0.04);
+}
+.metadata-table thead th {
+  border-bottom: 1px solid rgba(0,0,0,0.08);
+}
+
+/* extra left padding for the first column so labels don't touch the modal edge */
+.metadata-table td:first-child,
+.metadata-table th:first-child,
+.metadata-title {
+  padding-left: 1rem;
+}
+
+/* Use CSS Grid per row so columns adapt to content without one taking all space */
+.metadata-table thead tr,
+.metadata-table tbody tr {
+  display: grid;
+  /* Fix column widths to prevent jitter when a cell contains very long content.
+     First column (labels) is fixed; current/new columns are flexible with a comfortable minimum. */
+  grid-template-columns: 220px minmax(280px, 1fr) minmax(280px, 1fr);
+  gap: 1rem;
+  align-items: start;
+}
+.metadata-table thead tr {
+  border-bottom: none;
+}
+.metadata-table thead th,
+.metadata-table tbody td {
+  display: block; /* make cells behave as grid items */
+}
+.metadata-table thead th { font-weight: 600; }
+
+/* column sizing helpers */
+.metadata-table .col-label { width: 1%; }
+.metadata-table .col-current { width: auto; }
+.metadata-table .col-new { width: auto; }
+.metadata-edit-cell input {
+  width: 100%;
+  box-sizing: border-box;
+  border-radius: 8px;
+  border: 1px solid rgba(0,0,0,0.12);
+  padding: 0.5rem 0.6rem;
+}
+
+/* Ensure long labels wrap inside the first column without expanding it */
+.metadata-title strong {
+  display: block;
+  word-break: break-word;
+  overflow-wrap: anywhere;
+}
+
+/* Row aesthetics: zebra striping and hover */
+.metadata-table tbody tr {
+  border-top: 1px solid rgba(0,0,0,0.06);
+  border-bottom: 1px solid rgba(0,0,0,0.06);
+}
+.metadata-table tbody tr:nth-child(odd) {
+  background: rgba(0,0,0,0.02);
+}
+.metadata-table tbody tr:hover {
+  background: rgba(0,0,0,0.04);
+}
+
+/* Subtle vertical separators between columns */
+.metadata-table tbody td:not(:last-child) {
+  border-right: 1px solid rgba(0,0,0,0.06);
+}
+
+/* On small screens, stack rows to improve readability */
+@media (max-width: 640px) {
+  .metadata-table {
+    min-width: 0;
+  }
+  .metadata-table thead {
+    display: none;
+  }
+  .metadata-table tr {
+    display: block;
+    margin-bottom: 0.75rem;
+    border: 1px solid rgba(0,0,0,0.08);
+    padding: 0.75rem;
+    border-radius: 10px;
+    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
+  }
+  .metadata-table td {
+    display: block;
+    width: 100%;
+    padding: 0.25rem 0;
+  }
+  .metadata-title {
+    font-weight: 600;
+  }
+}
+
+/* On medium screens allow a comfortable min width; on very large screens keep roomy layout */
+@media (min-width: 1200px) {
+  .metadata-table {
+    min-width: 100ch;
+  }
+}
+
+/* Make sure table cells wrap content and images don't overflow */
+.metadata-table td, .metadata-table th {
+  overflow-wrap: anywhere;
+  word-break: break-word;
+  hyphens: auto;
+}
+.metadata-table img {
+  max-width: 100%;
+  height: auto;
+  display: block;
+}
+.cover-preview {
+  max-width: 160px;
+  max-height: 160px;
+  object-fit: contain;
+  border-radius: 8px;
+  box-shadow: 0 2px 10px rgba(0,0,0,0.12);
+}
+.metadata-muted { color: var(--color-muted, #666); font-size: 0.9em; }
+.metadata-current-row td {
+  color: var(--color-muted, #666);
+}
+.metadata-edit-row td {
+  background: rgba(0,0,0,0.02);
+}
+
+/* Multi-valued tag styling */
+.multi-value-hint {
+  display: block;
+  font-size: 0.75em;
+  color: var(--color-muted, #888);
+  font-weight: normal;
+  margin-top: 0.15em;
+}
+
+.multi-value-display {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.multi-value-item {
+  background: rgba(0,0,0,0.04);
+  padding: 0.25rem 0.5rem;
+  border-radius: 4px;
+  font-size: 0.9em;
+}
+
+.multi-value-editor {
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
+  flex: 1;
+}
+
+.multi-value-entry {
+  display: flex;
+  align-items: center;
+  gap: 0.25rem;
+}
+
+.multi-value-input {
+  flex: 1;
+  box-sizing: border-box;
+  border-radius: 6px;
+  border: 1px solid rgba(0,0,0,0.12);
+  padding: 0.35rem 0.5rem;
+  font-size: 0.9em;
+}
+
+.mini-button {
+  padding: 0.15em 0.25em !important;
+  min-width: auto !important;
+}
+
+.mini-button .material-icons {
+  font-size: 16px !important;
+}
+
+.add-entry-btn {
+  align-self: flex-start;
+  display: inline-flex;
+  align-items: center;
+  gap: 0.25rem;
+  font-size: 0.85em;
+  padding: 0.25rem 0.5rem;
+  margin-top: 0.15rem;
+}
+
+.add-entry-btn .material-icons {
+  font-size: 16px;
+}
+
+/* Ensure multi-value editor aligns well in the edit cell */
+.edit-with-actions {
+  display: flex;
+  align-items: flex-start;
+  gap: 0.5rem;
+}
+
+.edit-with-actions > .multi-value-editor {
+  flex: 1;
+}
+
+.edit-with-actions > .icon-button {
+  flex-shrink: 0;
+  margin-top: 0.25rem;
+}
+</style>

frontend/src/components/prompts/Prompts.vue

@@ -25,6 +25,7 @@ import Share from "./Share.vue";
 import ShareDelete from "./ShareDelete.vue";
 import Upload from "./Upload.vue";
 import DiscardEditorChanges from "./DiscardEditorChanges.vue";
+import ModifyMetadata from "./ModifyMetadata.vue";
 
 const layoutStore = useLayoutStore();
 
@@ -44,6 +45,7 @@ const components = new Map<string, any>([
   ["replace-rename", ReplaceRename],
   ["share", Share],
   ["upload", Upload],
+  ["modifyMetadata", ModifyMetadata],
   ["share-delete", ShareDelete],
   ["deleteUser", DeleteUser],
   ["discardEditorChanges", DiscardEditorChanges],

frontend/src/i18n/en.json

@@ -22,6 +22,9 @@
     "new": "New",
     "next": "Next",
     "ok": "OK",
+    "apply": "Apply",
+    "addField": "Add field",
+    "add": "Add",
     "permalink": "Get Permanent Link",
     "previous": "Previous",
     "preview": "Preview",
@@ -159,7 +162,41 @@
     "uploadMessage": "Select an option to upload.",
     "optionalPassword": "Optional password",
     "resolution": "Resolution",
-    "discardEditorChanges": "Are you sure you wish to discard the changes you've made?"
+    "discardEditorChanges": "Are you sure you wish to discard the changes you've made?",
+    "field": "Field",
+    "current": "Current",
+    "new": "New",
+    "multipleValuesCount": "Different on {count} files",
+    "noCover": "No cover",
+    "newFieldName": "Field name",
+    "newFieldValue": "Value",
+    "title": "Title",
+    "artist": "Artist",
+    "album": "Album",
+    "track": "Track",
+    "genre": "Genre",
+    "date": "Date",
+    "comment": "Comment",
+    "disc": "Disc",
+    "composer": "Composer",
+    "year": "Year",
+    "albumartist": "Album artist",
+    "picture": "Cover",
+    "cover": "Cover",
+    "musicbrainz_releasegroupid": "MusicBrainz Release Group ID",
+    "musicbrainz_trackid": "MusicBrainz Track ID",
+    "musicbrainz_albumid": "MusicBrainz Album ID",
+    "musicbrainz_artistid": "MusicBrainz Artist ID",
+    "tsrc": "ISRC",
+    "encoded_by": "Encoded by",
+    "encoder": "Encoder",
+    "copyright": "Copyright"
+  },
+  "metadata": {
+    "field": "Field",
+    "current": "Current",
+    "new": "New",
+    "multipleValuesCount": "Different on {count} files"
   },
   "search": {
     "images": "Images",

frontend/src/i18n/fr.json

@@ -22,6 +22,9 @@
     "new": "Nouveau",
     "next": "Suivant",
     "ok": "OK",
+    "apply": "Appliquer",
+    "addField": "Ajouter un champ",
+    "add": "Ajouter",
     "permalink": "Obtenir le lien permanent",
     "previous": "Précédent",
     "preview": "Prévisualiser",
@@ -159,7 +162,41 @@
     "uploadMessage": "Sélectionnez une option d'import.",
     "optionalPassword": "Mot de passe optionnel",
     "resolution": "Résolution",
-    "discardEditorChanges": "Êtes-vous sûr de vouloir annuler les modifications apportées ?"
+    "discardEditorChanges": "Êtes-vous sûr de vouloir annuler les modifications apportées ?",
+    "field": "Champ",
+    "current": "Actuel",
+    "new": "Nouveau",
+    "multipleValuesCount": "Différent sur {count} fichiers",
+    "noCover": "Pas de pochette",
+    "newFieldName": "Nom du champ",
+    "newFieldValue": "Valeur",
+    "title": "Titre",
+    "artist": "Artiste",
+    "album": "Album",
+    "track": "Piste",
+    "genre": "Genre",
+    "date": "Date",
+    "comment": "Commentaire",
+    "disc": "Disque",
+    "composer": "Compositeur",
+    "year": "Année",
+    "albumartist": "Artiste de l'album",
+    "picture": "Pochette",
+    "cover": "Pochette",
+    "musicbrainz_releasegroupid": "ID du groupe de publication MusicBrainz",
+    "musicbrainz_trackid": "ID de piste MusicBrainz",
+    "musicbrainz_albumid": "ID d'album MusicBrainz",
+    "musicbrainz_artistid": "ID d'artiste MusicBrainz",
+    "tsrc": "ISRC",
+    "encoded_by": "Encodé par",
+    "encoder": "Encodeur",
+    "copyright": "Copyright"
+  },
+  "metadata": {
+    "field": "Champ",
+    "current": "Actuel",
+    "new": "Nouveau",
+    "multipleValuesCount": "Différent sur {count} fichiers"
   },
   "search": {
     "images": "Images",

frontend/src/utils/metadata.ts

@@ -0,0 +1,241 @@
+// Frontend helpers for metadata fields: canonicalization, labels, and payload normalization
+
+export type Changes = Record<string, string>;
+export type MultiChanges = Record<string, string[]>; // for multi-valued tags
+export type MixedChanges = Record<string, string | string[]>; // combined type
+
+// Canonical names used for UI display
+export const Canonical = {
+  Title: "Title",
+  Artist: "Artist",
+  Artists: "Artists",
+  Album: "Album",
+  AlbumArtist: "AlbumArtist",
+  AlbumArtists: "AlbumArtists",
+  Composer: "Composer",
+  Track: "Track",
+  TrackNumber: "TrackNumber",
+  Disc: "Disc",
+  DiscNumber: "DiscNumber",
+  Genre: "Genre",
+  Date: "Date",
+  Year: "Year",
+  Comment: "Comment",
+  Lyrics: "Lyrics",
+} as const;
+
+const allowedCanonicals = new Set<string>(Object.values(Canonical));
+
+// Multi-valued tag canonical names
+export const multiValuedTags = new Set<string>([
+  Canonical.Artists,
+  Canonical.AlbumArtists,
+]);
+
+// Map various inputs (singular/plural/localized) to canonical names
+const canonicalMap: Record<string, string> = {
+  // title
+  "title": Canonical.Title,
+  "titre": Canonical.Title,
+  "song": Canonical.Title,
+
+  // artist
+  "artist": Canonical.Artist,
+  "artiste": Canonical.Artist,
+  // explicit multi-valued
+  "artists": Canonical.Artists,
+
+  // album
+  "album": Canonical.Album,
+
+  // album artist
+  "albumartist": Canonical.AlbumArtist,
+  "album artist": Canonical.AlbumArtist,
+  "album_artist": Canonical.AlbumArtist,
+  "artistesdelalbum": Canonical.AlbumArtist,
+  "artistealbum": Canonical.AlbumArtist,
+  // explicit multi-valued
+  "albumartists": Canonical.AlbumArtists,
+
+  // composer
+  "composer": Canonical.Composer,
+  "auteur": Canonical.Composer,
+
+  // track
+  "track": Canonical.Track,
+  "tracknumber": Canonical.Track,
+  "trackno": Canonical.Track,
+  "piste": Canonical.Track,
+  "track number": Canonical.TrackNumber,
+  "track_number": Canonical.TrackNumber,
+
+  // disc
+  "disc": Canonical.Disc,
+  "discnumber": Canonical.Disc,
+  "disque": Canonical.Disc,
+  "disc number": Canonical.DiscNumber,
+  "disc_number": Canonical.DiscNumber,
+
+  // genre
+  "genre": Canonical.Genre,
+
+  // date/year
+  "date": Canonical.Date,
+  "year": Canonical.Year,
+  "annee": Canonical.Year,
+  "année": Canonical.Year,
+
+  // comment
+  "comment": Canonical.Comment,
+  "commentaire": Canonical.Comment,
+
+  // lyrics
+  "lyrics": Canonical.Lyrics,
+};
+
+function normalizeToken(key: string): string {
+  return key
+    .trim()
+    .toLowerCase()
+    .replace(/[_-]+/g, " ")
+    .replace(/\s+/g, " ");
+}
+
+// Canonicalize a user-entered key (or backend key) to our display canonical
+export function canonicalizeKey(key: string): string {
+  const token = normalizeToken(key);
+  const mapped = canonicalMap[token];
+  if (mapped) return mapped;
+  // If user already provided a canonical we accept, keep it
+  if (allowedCanonicals.has(key)) return key;
+  return key; // unknown: keep as-is
+}
+
+// Given a backend key like "albumartist" or "title", return English display label
+export function fieldLabelFor(key: string): string {
+  const canon = canonicalizeKey(key);
+  // ensure nice spacing for camel case labels
+  if (allowedCanonicals.has(canon)) return canon;
+  // fallback: humanize
+  return humanize(key);
+}
+
+export function humanize(str: string): string {
+  if (!str) return str;
+  const s = String(str)
+    .replace(/([a-z0-9])([A-Z])/g, "$1 $2")
+    .replace(/[_\.\-]+/g, " ");
+  return s.charAt(0).toUpperCase() + s.slice(1);
+}
+
+// Normalize outgoing payload so backend gets canonical/expected keys
+export function normalizeChanges(changes: Changes): Changes {
+  const out: Changes = {};
+  for (const [k, v] of Object.entries(changes)) {
+    const val = String(v ?? "").trim();
+    if (!val) continue;
+    const canon = canonicalizeKey(k);
+    if (allowedCanonicals.has(canon)) {
+      out[canon] = val;
+    } else {
+      // keep unknowns but trimmed; backend will filter if unsupported
+      out[k] = val;
+    }
+  }
+  return out;
+}
+
+export function canonicalizeKeys(keys: string[]): string[] {
+  const out: string[] = [];
+  for (const k of keys) {
+    const canon = canonicalizeKey(k);
+    if (allowedCanonicals.has(canon)) out.push(canon);
+  }
+  return out;
+}
+
+// Recommended Navidrome-sensitive tags for Add Field suggestions
+export const navidromeTags: string[] = [
+  Canonical.Title,
+  Canonical.Artist,
+  Canonical.Artists,
+  Canonical.Album,
+  Canonical.AlbumArtist,
+  Canonical.AlbumArtists,
+  Canonical.Track,
+  Canonical.TrackNumber,
+  Canonical.Disc,
+  Canonical.DiscNumber,
+  Canonical.Genre,
+  Canonical.Date,
+  Canonical.Year,
+  Canonical.Composer,
+  Canonical.Lyrics,
+  // common MusicBrainz IDs (Vorbis comments)
+  "MUSICBRAINZ_ARTISTID",
+  "MUSICBRAINZ_ALBUMID",
+  "MUSICBRAINZ_TRACKID",
+  "MUSICBRAINZ_RELEASEGROUPID",
+];
+
+export function isMultiValuedTag(canon: string): boolean {
+  return multiValuedTags.has(canon);
+}
+
+// Check if a key (after canonicalization) is a multi-valued tag
+export function isMultiValuedKey(key: string): boolean {
+  const canon = canonicalizeKey(key);
+  return isMultiValuedTag(canon);
+}
+
+// Format multi-valued array for display (join with line breaks)
+export function formatMultiValueDisplay(values: string[]): string {
+  if (!values || values.length === 0) return "";
+  return values.join("\n");
+}
+
+// Parse display string back to array (split by newlines)
+export function parseMultiValueInput(input: string): string[] {
+  if (!input) return [];
+  return input
+    .split(/\n/)
+    .map((s) => s.trim())
+    .filter(Boolean);
+}
+
+// Split a user-entered multi-valued string into individual entries using
+// safe separators. Avoid splitting on plain '/' to not break names like AC/DC;
+// prefer ' / ' with spaces, ';', and ' feat. '.
+export function splitMultiValues(input: string): string[] {
+  let s = (input || "").trim();
+  if (!s) return [];
+  const parts: string[] = [];
+  const separators = [/\s;\s?/, /\s\/\s/, /\sfeat\.\s/i];
+  // Normalize separators to a unified delimiter
+  for (const sep of separators) {
+    s = s.replace(sep, "|||");
+  }
+  s.split("|||").forEach((p) => {
+    const v = p.trim();
+    if (v) parts.push(v);
+  });
+  return parts;
+}
+
+// Normalize mixed changes (strings + arrays) for multi-valued tags.
+export function normalizeMixedChanges(changes: Record<string, any>): Record<string, any> {
+  const out: Record<string, any> = {};
+  for (const [k, v] of Object.entries(changes)) {
+    const canon = canonicalizeKey(k);
+    if (Array.isArray(v)) {
+      const values = v.map((x) => String(x || "").trim()).filter(Boolean);
+      if (values.length === 0) continue;
+      out[canon] = values;
+      continue;
+    }
+    const val = String(v ?? "").trim();
+    if (!val) continue;
+    out[canon] = val;
+  }
+  return out;
+}

frontend/src/views/files/FileListing.vue

@@ -72,6 +72,12 @@
           :label="t('buttons.upload')"
           @action="uploadFunc"
         />
+        <action
+          v-if="headerButtons.metadata"
+          icon="library_music"
+          :label="t('metadata')"
+          @action="openMetadata"
+        />
         <action icon="info" :label="t('buttons.info')" show="info" />
         <action
           icon="check_circle"
@@ -302,6 +308,12 @@
             @action="download"
             :counter="fileStore.selectedCount"
           />
+          <action
+            v-if="headerButtons.metadata"
+            icon="library_music"
+            :label="t('metadata')"
+            @action="openMetadata"
+          />
           <action icon="info" :label="t('buttons.info')" show="info" />
         </context-menu>
 
@@ -483,9 +495,29 @@ const headerButtons = computed(() => {
     share: fileStore.selectedCount === 1 && authStore.user?.perm.share,
     move: fileStore.selectedCount > 0 && authStore.user?.perm.rename,
     copy: fileStore.selectedCount > 0 && authStore.user?.perm.create,
+    metadata:
+      fileStore.selectedCount > 0 &&
+      fileStore.req &&
+      fileStore.selected.every((i) => {
+        const name = fileStore.req!.items[i].name || "";
+        const idx = name.lastIndexOf(".");
+        const ext = idx === -1 ? "" : name.substring(idx).toLowerCase();
+        return [".mp3", ".flac", ".m4a", ".m4b", ".mp4"].includes(ext);
+      }),
   };
 });
 
+const openMetadata = () => {
+  if (!fileStore.req) return;
+
+  const files: string[] = [];
+  for (const i of fileStore.selected) {
+    files.push(fileStore.req.items[i].url);
+  }
+
+  layoutStore.showHover({ prompt: "modifyMetadata", props: { files } });
+};
+
 const isMobile = computed(() => {
   return width.value <= 736;
 });

go.mod

@@ -41,6 +41,8 @@ require (
 	github.com/bodgit/windows v1.0.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.6 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/dhowden/tag v0.0.0-20240417053706-3d75831295e8 // indirect
+	github.com/bogem/id3v2/v2 v2.1.4
 	github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 // indirect
 	github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd // indirect
 	github.com/dsoprea/go-utility/v2 v2.0.0-20221003172846-a3e1774ef349 // indirect

go.sum

@@ -1,464 +0,0 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
-cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
-cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
-cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/DataDog/zstd v1.4.1 h1:3oxKN3wbHibqx897utPC2LTQU4J+IHWWJO+glkAkpFM=
-github.com/DataDog/zstd v1.4.1/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
-github.com/STARRY-S/zip v0.2.3 h1:luE4dMvRPDOWQdeDdUxUoZkzUIpTccdKdhHHsQJ1fm4=
-github.com/STARRY-S/zip v0.2.3/go.mod h1:lqJ9JdeRipyOQJrYSOtpNAiaesFO6zVDsE8GIGFaoSk=
-github.com/Sereal/Sereal v0.0.0-20190618215532-0b8ac451a863 h1:BRrxwOZBolJN4gIwvZMJY1tzqBvQgpaZiQRuIDD40jM=
-github.com/Sereal/Sereal v0.0.0-20190618215532-0b8ac451a863/go.mod h1:D0JMgToj/WdxCgd30Kc1UcA9E+WdZoJqeVOuYW7iTBM=
-github.com/andybalholm/brotli v1.2.0 h1:ukwgCxwYrmACq68yiUqwIWnGY0cTPox/M94sVwToPjQ=
-github.com/andybalholm/brotli v1.2.0/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
-github.com/asdine/storm/v3 v3.2.1 h1:I5AqhkPK6nBZ/qJXySdI7ot5BlXSZ7qvDY1zAn5ZJac=
-github.com/asdine/storm/v3 v3.2.1/go.mod h1:LEpXwGt4pIqrE/XcTvCnZHT5MgZCV6Ub9q7yQzOFWr0=
-github.com/asticode/go-astikit v0.20.0/go.mod h1:h4ly7idim1tNhaVkdVBeXQZEE3L0xblP7fCWbgwipF0=
-github.com/asticode/go-astikit v0.30.0/go.mod h1:h4ly7idim1tNhaVkdVBeXQZEE3L0xblP7fCWbgwipF0=
-github.com/asticode/go-astikit v0.56.0 h1:DmD2p7YnvxiPdF0h+dRmos3bsejNEXbycENsY5JfBqw=
-github.com/asticode/go-astikit v0.56.0/go.mod h1:fV43j20UZYfXzP9oBn33udkvCvDvCDhzjVqoLFuuYZE=
-github.com/asticode/go-astisub v0.38.0 h1:Qh3IO8Cotn0wwok5maid7xqsIJTwn2DtABT1UajKJaI=
-github.com/asticode/go-astisub v0.38.0/go.mod h1:WTkuSzFB+Bp7wezuSf2Oxulj5A8zu2zLRVFf6bIFQK8=
-github.com/asticode/go-astits v1.8.0/go.mod h1:DkOWmBNQpnr9mv24KfZjq4JawCFX1FCqjLVGvO0DygQ=
-github.com/asticode/go-astits v1.13.0 h1:XOgkaadfZODnyZRR5Y0/DWkA9vrkLLPLeeOvDwfKZ1c=
-github.com/asticode/go-astits v1.13.0/go.mod h1:QSHmknZ51pf6KJdHKZHJTLlMegIrhega3LPWz3ND/iI=
-github.com/bodgit/plumbing v1.3.0 h1:pf9Itz1JOQgn7vEOE7v7nlEfBykYqvUYioC61TwWCFU=
-github.com/bodgit/plumbing v1.3.0/go.mod h1:JOTb4XiRu5xfnmdnDJo6GmSbSbtSyufrsyZFByMtKEs=
-github.com/bodgit/sevenzip v1.6.1 h1:kikg2pUMYC9ljU7W9SaqHXhym5HyKm8/M/jd31fYan4=
-github.com/bodgit/sevenzip v1.6.1/go.mod h1:GVoYQbEVbOGT8n2pfqCIMRUaRjQ8F9oSqoBEqZh5fQ8=
-github.com/bodgit/windows v1.0.1 h1:tF7K6KOluPYygXa3Z2594zxlkbKPAOvqr97etrGNIz4=
-github.com/bodgit/windows v1.0.1/go.mod h1:a6JLwrB4KrTR5hBpp8FI9/9W9jJfeQ2h4XDXU74ZCdM=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
-github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
-github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
-github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/cpuguy83/go-md2man/v2 v2.0.6 h1:XJtiaUW6dEEqVuZiMTn1ldk455QWwEIsMIJlo5vtkx0=
-github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
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-github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 h1:2tV76y6Q9BB+NEBasnqvs7e49aEBFI8ejC89PSnWH+4=
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-github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
-github.com/dsoprea/go-exif/v2 v2.0.0-20200321225314-640175a69fe4/go.mod h1:Lm2lMM2zx8p4a34ZemkaUV95AnMl4ZvLbCUbwOvLC2E=
-github.com/dsoprea/go-exif/v3 v3.0.0-20200717053412-08f1b6708903/go.mod h1:0nsO1ce0mh5czxGeLo4+OCZ/C6Eo6ZlMWsz7rH/Gxv8=
-github.com/dsoprea/go-exif/v3 v3.0.0-20210625224831-a6301f85c82b/go.mod h1:cg5SNYKHMmzxsr9X6ZeLh/nfBRHHp5PngtEPcujONtk=
-github.com/dsoprea/go-exif/v3 v3.0.0-20221003160559-cf5cd88aa559/go.mod h1:rW6DMEv25U9zCtE5ukC7ttBRllXj7g7TAHl7tQrT5No=
-github.com/dsoprea/go-exif/v3 v3.0.0-20221003171958-de6cb6e380a8/go.mod h1:akyZEJZ/k5bmbC9gA612ZLQkcED8enS9vuTiuAkENr0=
-github.com/dsoprea/go-exif/v3 v3.0.1 h1:/IE4iW7gvY7BablV1XY0unqhMv26EYpOquVMwoBo/wc=
-github.com/dsoprea/go-exif/v3 v3.0.1/go.mod h1:10HkA1Wz3h398cDP66L+Is9kKDmlqlIJGPv8pk4EWvc=
-github.com/dsoprea/go-logging v0.0.0-20190624164917-c4f10aab7696/go.mod h1:Nm/x2ZUNRW6Fe5C3LxdY1PyZY5wmDv/s5dkPJ/VB3iA=
-github.com/dsoprea/go-logging v0.0.0-20200517223158-a10564966e9d/go.mod h1:7I+3Pe2o/YSU88W0hWlm9S22W7XI1JFNJ86U0zPKMf8=
-github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd h1:l+vLbuxptsC6VQyQsfD7NnEC8BZuFpz45PgY+pH8YTg=
-github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd/go.mod h1:7I+3Pe2o/YSU88W0hWlm9S22W7XI1JFNJ86U0zPKMf8=
-github.com/dsoprea/go-utility v0.0.0-20200711062821-fab8125e9bdf/go.mod h1:95+K3z2L0mqsVYd6yveIv1lmtT3tcQQ3dVakPySffW8=
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-gopkg.in/natefinch/lumberjack.v2 v2.2.1 h1:bBRl1b0OH9s/DuPhuXpNl+VtCaJXFZ5/uEFST95x9zc=
-gopkg.in/natefinch/lumberjack.v2 v2.2.1/go.mod h1:YD8tP3GAjkrDg1eZH7EGmyESg/lsYskCTPBJVb9jqSc=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

http/data.go

@@ -48,9 +48,32 @@ func (d *data) Check(path string) bool {
 }
 
 func handle(fn handleFunc, prefix string, store *storage.Storage, server *settings.Server) http.Handler {
+    // trackingWriter wraps the ResponseWriter to detect if headers/body were already written.
+    type trackingWriter struct {
+        http.ResponseWriter
+        wroteHeader bool
+        wroteBody   bool
+    }
+    func (tw *trackingWriter) WriteHeader(code int) {
+        if !tw.wroteHeader {
+            tw.wroteHeader = true
+            tw.ResponseWriter.WriteHeader(code)
+        }
+    }
+    func (tw *trackingWriter) Write(b []byte) (int, error) {
+        // Any Write implies headers committed (status 200 if none set)
+        if !tw.wroteHeader {
+            tw.wroteHeader = true
+        }
+        tw.wroteBody = true
+        return tw.ResponseWriter.Write(b)
+    }
+
     handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        // Wrap writer to prevent superfluous WriteHeader calls
+        tw := &trackingWriter{ResponseWriter: w}
 		for k, v := range globalHeaders {
-			w.Header().Set(k, v)
+			tw.Header().Set(k, v)
 		}
 
 		settings, err := store.Settings.Get()
@@ -59,7 +82,7 @@ func handle(fn handleFunc, prefix string, store *storage.Storage, server *settin
 			return
 		}
 
-		status, err := fn(w, r, &data{
+		status, err := fn(tw, r, &data{
 			Runner:   &runner.Runner{Enabled: server.EnableExec, Settings: settings},
 			store:    store,
 			settings: settings,
@@ -76,7 +99,10 @@ func handle(fn handleFunc, prefix string, store *storage.Storage, server *settin
 			if status == http.StatusBadRequest && err != nil {
 				txt += " (" + err.Error() + ")"
 			}
-			http.Error(w, strconv.Itoa(status)+" "+txt, status)
+			// Only write an error response if nothing was written yet.
+			if !tw.wroteHeader && !tw.wroteBody {
+				http.Error(tw, strconv.Itoa(status)+" "+txt, status)
+			}
 			return
 		}
 	})

http/id3_clear.go

@@ -0,0 +1,117 @@
+package fbhttp
+
+import (
+    "strings"
+    "unicode"
+    id3v2 "github.com/bogem/id3v2/v2"
+)
+
+// clearID3v2Frames removes specific ID3v2 frames from an MP3 file.
+// frames: list of standard frame IDs (e.g., TIT2, TPE1, TPE2, TRCK, TPOS, TCON, TDRC, COMM, USLT)
+// txxxDescs: list of UserDefinedText (TXXX) descriptions to remove (e.g., "Artists", "AlbumArtists").
+func clearID3v2Frames(path string, frames []string, txxxDescs []string, removeNumericEmpty bool) error {
+    tag, err := id3v2.Open(path, id3v2.Options{Parse: true})
+    if err != nil {
+        return err
+    }
+    defer tag.Close()
+
+    // Delete standard frames
+    for _, id := range frames {
+        tag.DeleteFrames(id)
+    }
+
+    // Delete matching TXXX frames by description (preserve others)
+    if len(txxxDescs) > 0 {
+        fs := tag.GetFrames("TXXX")
+        keep := []id3v2.UserDefinedTextFrame{}
+        for _, f := range fs {
+            udf, ok := f.(id3v2.UserDefinedTextFrame)
+            if !ok {
+                continue
+            }
+            remove := false
+            for _, d := range txxxDescs {
+                if strings.EqualFold(udf.Description, d) {
+                    remove = true
+                    break
+                }
+            }
+            if !remove && removeNumericEmpty {
+                desc := strings.TrimSpace(udf.Description)
+                if desc == "" {
+                    remove = true
+                } else {
+                    // numeric-only descriptions like "0", "1", "2"
+                    allDigits := true
+                    for _, r := range desc {
+                        if !unicode.IsDigit(r) {
+                            allDigits = false
+                            break
+                        }
+                    }
+                    if allDigits {
+                        remove = true
+                    }
+                }
+            }
+            if !remove {
+                keep = append(keep, udf)
+            }
+        }
+        // Remove all TXXX frames, then re-add the ones we keep
+        tag.DeleteFrames("TXXX")
+        for _, udf := range keep {
+            tag.AddFrame("TXXX", udf)
+        }
+    }
+
+    return tag.Save()
+}
+
+// cleanupNumericEmptyTXXX removes any TXXX frames whose descriptions are empty
+// or purely numeric (e.g., "0", "1", "2"…), which are common artifacts.
+func cleanupNumericEmptyTXXX(path string) error {
+    tag, err := id3v2.Open(path, id3v2.Options{Parse: true})
+    if err != nil {
+        return err
+    }
+    defer tag.Close()
+
+    fs := tag.GetFrames("TXXX")
+    keep := []id3v2.UserDefinedTextFrame{}
+    for _, f := range fs {
+        udf, ok := f.(id3v2.UserDefinedTextFrame)
+        if !ok {
+            continue
+        }
+        desc := strings.TrimSpace(udf.Description)
+        remove := false
+        if desc == "" {
+            remove = true
+        } else {
+            allDigits := true
+            for _, r := range desc {
+                if !unicode.IsDigit(r) {
+                    allDigits = false
+                    break
+                }
+            }
+            if allDigits {
+                remove = true
+            }
+        }
+        if !remove {
+            keep = append(keep, udf)
+        }
+    }
+    // If nothing to change, return early
+    if len(keep) == len(fs) {
+        return nil
+    }
+    tag.DeleteFrames("TXXX")
+    for _, udf := range keep {
+        tag.AddFrame("TXXX", udf)
+    }
+    return tag.Save()
+}

http/metadata.go

@@ -0,0 +1,257 @@
+package fbhttp
+
+import (
+    "strings"
+)
+
+// canonicalMap maps various user-entered or localized keys to canonical tag names.
+// Canonical names are English, PascalCase where appropriate (e.g., AlbumArtist).
+var canonicalMap = map[string]string{
+    // title
+    "title": "Title",
+    "titre": "Title",
+    "song": "Title",
+
+    // artist (main)
+    "artist": "Artist",
+    "artiste": "Artist",
+    "artists": "Artist",
+
+    // album
+    "album": "Album",
+
+    // album artist
+    "albumartist": "AlbumArtist",
+    "album artist": "AlbumArtist",
+    "album_artist": "AlbumArtist",
+    "artistesdelalbum": "AlbumArtist",
+    "artistealbum": "AlbumArtist",
+
+    // composer / author
+    "composer": "Composer",
+    "auteur": "Composer",
+
+    // track
+    "track": "Track",
+    "tracknumber": "Track",
+    "trackno": "Track",
+    "piste": "Track",
+
+    // disc
+    "disc": "Disc",
+    "discnumber": "Disc",
+    "disque": "Disc",
+
+    // genre
+    "genre": "Genre",
+
+    // year/date
+    "year": "Year",
+    "annee": "Year",
+    "année": "Year",
+    "date": "Date",
+
+    // comment
+    "comment": "Comment",
+    "commentaire": "Comment",
+
+    // lyrics
+    "lyrics": "Lyrics",
+}
+
+// ffmpegKey maps canonical names to ffmpeg metadata keys.
+// FFmpeg expects lower-case keys; AlbumArtist becomes album_artist, Year maps to date.
+var ffmpegKey = map[string]string{
+    "Title":       "title",
+    "Artist":      "artist",
+    "Album":       "album",
+    "AlbumArtist": "album_artist",
+    "Composer":    "composer",
+    "Track":       "track",
+    "TrackNumber": "track",
+    "Disc":        "disc",
+    "DiscNumber":  "disc",
+    "Genre":       "genre",
+    "Date":        "date",
+    "Year":        "date", // prefer date for ffmpeg
+    "Comment":     "comment",
+    "Lyrics":      "lyrics",
+}
+
+// ffmpegMultiKey maps multi-valued canonical names to ffmpeg/Vorbis keys.
+// For FLAC/Vorbis, use uppercase ARTISTS/ALBUMARTISTS for proper multi-value support.
+var ffmpegMultiKey = map[string]string{
+    "Artists":      "ARTISTS",
+    "AlbumArtists": "ALBUMARTISTS",
+}
+
+// allowedCanonicals is the set of canonical tags we accept for writes.
+var allowedCanonicals = func() map[string]struct{} {
+    m := make(map[string]struct{}, len(ffmpegKey)+len(ffmpegMultiKey))
+    for k := range ffmpegKey {
+        m[k] = struct{}{}
+    }
+    for k := range ffmpegMultiKey {
+        m[k] = struct{}{}
+    }
+    return m
+}()
+
+// normalizeKey reduces a user-provided key to a lookup token: lowercased, trimmed
+// and with common separators removed.
+func normalizeKey(s string) string {
+    s = strings.TrimSpace(s)
+    s = strings.ToLower(s)
+    // normalize separators so that "Album Artist", "album-artist", "album_artist" match
+    s = strings.ReplaceAll(s, "_", " ")
+    s = strings.ReplaceAll(s, "-", " ")
+    s = strings.Join(strings.Fields(s), " ") // collapse multiple spaces
+    return s
+}
+
+// normalizeAndMapToFFmpeg takes arbitrary incoming tags, applies key normalization
+// and synonym mapping, filters to allowed canonical keys, and returns a map of
+// ffmpeg-ready metadata keys with their values (empty values are dropped).
+func normalizeAndMapToFFmpeg(in map[string]string) map[string]string {
+    out := map[string]string{}
+    for k, v := range in {
+        if strings.TrimSpace(v) == "" {
+            continue
+        }
+        token := normalizeKey(k)
+        canonical, ok := canonicalMap[token]
+        if !ok {
+            // If user already provided a canonical name, accept it
+            // (e.g., Title, Artist, AlbumArtist)
+            c2 := strings.TrimSpace(k)
+            if _, allowed := allowedCanonicals[c2]; allowed {
+                canonical = c2
+            } else {
+                // unrecognized key: skip
+                continue
+            }
+        }
+        ffk, ok := ffmpegKey[canonical]
+        if !ok {
+            continue
+        }
+        out[ffk] = v
+    }
+    return out
+}
+// normalizeMultiToFFmpeg maps multi-valued canonical keys to ffmpeg keys, preserving arrays.
+// Uses ffmpegMultiKey for proper Vorbis comment names (ARTISTS, ALBUMARTISTS).
+func normalizeMultiToFFmpeg(in map[string][]string) map[string][]string {
+    out := map[string][]string{}
+    for k, arr := range in {
+        token := normalizeKey(k)
+        canonical, ok := canonicalMap[token]
+        if !ok {
+            // if already canonical, keep as-is
+            if _, allowed := allowedCanonicals[k]; allowed {
+                canonical = k
+            } else {
+                continue
+            }
+        }
+        // First check if this is a multi-valued tag
+        ffk, ok := ffmpegMultiKey[canonical]
+        if !ok {
+            // Fall back to regular ffmpeg key
+            ffk, ok = ffmpegKey[canonical]
+            if !ok {
+                continue
+            }
+        }
+        vals := []string{}
+        for _, v := range arr {
+            v = strings.TrimSpace(v)
+            if v == "" {
+                continue
+            }
+            vals = append(vals, v)
+        }
+        if len(vals) > 0 {
+            out[ffk] = vals
+        }
+    }
+    return out
+}
+
+// mapClearCanonicalsToFFmpeg converts a list of canonical names to ffmpeg keys
+// intended to be cleared by setting them to empty value.
+func mapClearCanonicalsToFFmpeg(keys []string) map[string]struct{} {
+    out := map[string]struct{}{}
+    for _, k := range keys {
+        token := normalizeKey(k)
+        canonical, ok := canonicalMap[token]
+        if !ok {
+            // if already canonical and allowed, keep
+            if _, allowed := allowedCanonicals[k]; allowed {
+                canonical = k
+            } else {
+                continue
+            }
+        }
+        if ffk, ok := ffmpegKey[canonical]; ok {
+            out[ffk] = struct{}{}
+        }
+    }
+    return out
+}
+
+// mapClearsToID3Frames converts canonical clear keys to ID3v2 frame IDs
+func mapClearsToID3Frames(keys []string) []string {
+    out := []string{}
+    for _, k := range keys {
+        token := normalizeKey(k)
+        canonical, ok := canonicalMap[token]
+        if !ok {
+            if _, allowed := allowedCanonicals[k]; allowed {
+                canonical = k
+            } else {
+                continue
+            }
+        }
+        switch canonical {
+        case "Title":
+            out = append(out, "TIT2")
+        case "Artist", "Artists":
+            out = append(out, "TPE1")
+        case "Album":
+            out = append(out, "TALB")
+        case "AlbumArtist", "AlbumArtists":
+            out = append(out, "TPE2")
+        case "Composer":
+            out = append(out, "TCOM")
+        case "Track", "TrackNumber":
+            out = append(out, "TRCK")
+        case "Disc", "DiscNumber":
+            out = append(out, "TPOS")
+        case "Genre":
+            out = append(out, "TCON")
+        case "Date", "Year":
+            // Prefer TDRC; TYER used historically
+            out = append(out, "TDRC", "TYER")
+        case "Comment":
+            out = append(out, "COMM")
+        case "Lyrics":
+            out = append(out, "USLT")
+        }
+    }
+    return out
+}
+
+func mapClearsToTXXX(keys []string) []string {
+    out := []string{}
+    for _, k := range keys {
+        token := normalizeKey(k)
+        switch token {
+        case "artists":
+            out = append(out, "Artists", "ARTISTS")
+        case "albumartists":
+            out = append(out, "AlbumArtists", "ALBUMARTISTS")
+        }
+    }
+    return out
+}

http/resource.go

@@ -2,6 +2,7 @@ package fbhttp
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -10,9 +11,11 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"os/exec"
 	"path"
 	"path/filepath"
 	"strings"
+    "time"
 
 	"github.com/shirou/gopsutil/v4/disk"
 	"github.com/spf13/afero"
@@ -54,6 +57,13 @@ var resourceGetHandler = withUser(func(w http.ResponseWriter, r *http.Request, d
 		file.Content = ""
 	}
 
+	// If metadata requested, attempt to read audio tags and attach them
+	if r.URL.Query().Get("metadata") == "1" {
+		if err := file.ReadAudioTags(); err != nil {
+			log.Printf("warning: failed reading audio tags for %s: %v", file.Path, err)
+		}
+	}
+
 	return renderJSON(w, r, file)
 })
 
@@ -201,14 +211,20 @@ func resourcePatchHandler(fileCache FileCache) handleFunc {
 			return http.StatusForbidden, nil
 		}
 
+		// Only check parent relationship when a destination was provided.
+		// Some actions (like metadata) don't provide a destination and calling
+		// filepath.Rel with an empty dst returns an error "can't make relative to ...".
+		if dst != "" {
 			err = checkParent(src, dst)
 			if err != nil {
 				return http.StatusBadRequest, err
 			}
+		}
 
 		override := r.URL.Query().Get("override") == "true"
 		rename := r.URL.Query().Get("rename") == "true"
-		if !override && !rename {
+		// Only check destination existence when a destination was provided.
+		if dst != "" && !override && !rename {
 			if _, err = d.user.Fs.Stat(dst); err == nil {
 				return http.StatusConflict, nil
 			}
@@ -222,6 +238,89 @@ func resourcePatchHandler(fileCache FileCache) handleFunc {
 			return http.StatusForbidden, nil
 		}
 
+		// Special-case metadata action because it needs the request body
+		if action == "metadata" {
+			if !d.user.Perm.Modify {
+				return http.StatusForbidden, nil
+			}
+
+			var tags map[string]string
+			multi := map[string][]string{}
+			var clear []string
+			body, err := io.ReadAll(r.Body)
+			if err != nil {
+				return http.StatusBadRequest, err
+			}
+			// Accept both plain tag maps and objects with __clear__ array
+			var raw map[string]any
+			if err := json.Unmarshal(body, &raw); err == nil && raw != nil {
+				// extract string-valued entries into tags
+				tags = map[string]string{}
+				for k, v := range raw {
+					if k == "__clear__" {
+						// parse array of strings
+						if arr, ok := v.([]any); ok {
+							for _, itm := range arr {
+								if s, ok := itm.(string); ok {
+									s = strings.TrimSpace(s)
+									if s != "" {
+										clear = append(clear, s)
+									}
+								}
+							}
+						}
+						continue
+					}
+					if sv, ok := v.(string); ok {
+						tags[k] = sv
+						continue
+					}
+					if arr, ok := v.([]any); ok {
+						vals := []string{}
+						for _, itm := range arr {
+							if s, ok := itm.(string); ok {
+								s = strings.TrimSpace(s)
+								if s != "" {
+									vals = append(vals, s)
+								}
+							}
+						}
+						if len(vals) > 0 {
+							multi[k] = vals
+						}
+					}
+				}
+			} else {
+				// fallback to simple map
+				tags = map[string]string{}
+				if err := json.Unmarshal(body, &tags); err != nil {
+					return http.StatusBadRequest, err
+				}
+			}
+
+			// If the source is a directory, apply changes to all audio files within.
+			// Otherwise, apply to the single file.
+			err = d.RunHook(func() error {
+				fi, statErr := files.NewFileInfo(&files.FileOptions{
+					Fs:         d.user.Fs,
+					Path:       src,
+					Modify:     d.user.Perm.Modify,
+					Expand:     false,
+					ReadHeader: false,
+					Checker:    d,
+				})
+				if statErr != nil {
+					return statErr
+				}
+				if fi.IsDir {
+					return applyMetadataToDir(r.Context(), d, src, tags, multi, clear)
+				}
+				return applyMetadataWithFFmpeg(r.Context(), d, src, tags, multi, clear)
+			}, action, src, dst, d.user)
+
+			return errToStatus(err), err
+		}
+
 		err = d.RunHook(func() error {
 			return patchAction(r.Context(), action, src, dst, d, fileCache)
 		}, action, src, dst, d.user)
@@ -230,6 +329,257 @@ func resourcePatchHandler(fileCache FileCache) handleFunc {
 	})
 }
 
+// applyMetadataWithFFmpeg attempts to write metadata using ffmpeg by creating
+// a temporary file and replacing the original. This requires that the
+// underlying filesystem exposes a real path (see FileInfo.RealPath()).
+// For FLAC files with multi-valued tags (ARTISTS, ALBUMARTISTS), it uses
+// metaflac directly since ffmpeg doesn't support true multi-valued Vorbis comments.
+func applyMetadataWithFFmpeg(ctx context.Context, d *data, src string, tags map[string]string, multi map[string][]string, clear []string) error {
+	fi, err := files.NewFileInfo(&files.FileOptions{
+		Fs:         d.user.Fs,
+		Path:       src,
+		Modify:     d.user.Perm.Modify,
+		Expand:     false,
+		ReadHeader: false,
+		Checker:    d,
+	})
+	if err != nil {
+		return err
+	}
+
+	real := fi.RealPath()
+	// If RealPath returns the same virtual path, we cannot run ffmpeg on it.
+	if real == "" || real == fi.Path {
+		return fmt.Errorf("unable to obtain underlying real file path for %s: %w", fi.Path, fberrors.ErrInvalidRequestParams)
+	}
+
+	// Ensure ffmpeg is available
+	if _, err := exec.LookPath("ffmpeg"); err != nil {
+		return fmt.Errorf("ffmpeg not found: %w", err)
+	}
+
+	dir := filepath.Dir(real)
+
+	// Create a unique temporary filename in the same directory and keep the
+	// same extension as the original so ffmpeg can infer the output format.
+	ext := filepath.Ext(real)
+	tmp := filepath.Join(dir, fmt.Sprintf(".metadata_tmp_%d%s", time.Now().UnixNano(), ext))
+
+	// Ensure the temp file is removed on error
+	defer func() {
+		if _, statErr := os.Stat(tmp); statErr == nil {
+			_ = os.Remove(tmp)
+		}
+	}()
+
+	// Build ffmpeg args to preserve existing metadata and override only the
+	// provided non-empty fields. We explicitly map input global metadata (0)
+	// to output, and avoid `-map_metadata -1` which would clear everything.
+	args := []string{"-y", "-i", real, "-map_metadata", "0", "-c", "copy"}
+	// For MP3, prefer ID3v2.4 to support multi-valued tags properly
+	isMP3 := strings.EqualFold(ext, ".mp3")
+	// Treat M4A/MP4 similarly for metadata handling specifics
+	isMP4 := strings.EqualFold(ext, ".m4a") || strings.EqualFold(ext, ".m4b") || strings.EqualFold(ext, ".mp4")
+	// FLAC supports true multi-valued Vorbis comments via metaflac
+	isFLAC := strings.EqualFold(ext, ".flac")
+	if isMP3 {
+		args = append(args, "-id3v2_version", "4")
+	}
+
+	// For FLAC files with multi-valued tags, use metaflac which properly supports
+	// multiple values for the same tag (Vorbis comments).
+	if isFLAC && len(multi) > 0 {
+		if _, err := exec.LookPath("metaflac"); err == nil {
+			// Use metaflac for multi-valued tags
+			if err := applyMultiValuedTagsWithMetaflac(ctx, real, tags, multi, clear); err != nil {
+				log.Printf("metaflac failed, falling back to ffmpeg: %v", err)
+				// Fall through to ffmpeg
+			} else {
+				return nil
+			}
+		}
+	}
+
+	// If MP3 and there are clears, perform ID3v2 in-place removal first.
+	// This avoids ffmpeg creating unwanted empty entries (e.g., TXXX artifacts).
+	didID3Clear := false
+	if isMP3 && len(clear) > 0 {
+		frames := mapClearsToID3Frames(clear)
+		txxx := mapClearsToTXXX(clear)
+		removeNumeric := false
+		for _, c := range clear {
+			tok := normalizeKey(c)
+			if tok == "artists" || tok == "albumartists" {
+				removeNumeric = true
+				break
+			}
+		}
+		if err := clearID3v2Frames(real, frames, txxx, removeNumeric); err == nil {
+			didID3Clear = true
+		}
+		// If ID3 clear failed, we'll still try ffmpeg below; but we won't add ffmpeg clears for MP3.
+	}
+
+	// Normalize incoming keys and map to ffmpeg keys
+	norm := normalizeAndMapToFFmpeg(tags)
+	changes := 0
+	setKeys := map[string]struct{}{}
+	for k, v := range norm {
+		args = append(args, "-metadata", fmt.Sprintf("%s=%s", k, v))
+		changes++
+		setKeys[k] = struct{}{}
+	}
+	// Handle multi-valued tags (e.g., Artists, AlbumArtists)
+	if len(multi) > 0 {
+		mm := normalizeMultiToFFmpeg(multi)
+		for ffk, vals := range mm {
+			// MP4/M4A expects a single value; join for compatibility
+			if isMP4 && (ffk == "artist" || ffk == "album_artist") {
+				if len(vals) > 0 {
+					joined := strings.Join(vals, "; ")
+					args = append(args, "-metadata", fmt.Sprintf("%s=%s", ffk, joined))
+					changes++
+					setKeys[ffk] = struct{}{}
+				}
+				continue
+			}
+			// MP3 (ID3): prefer writing consolidated artist/album_artist rather than TXXX ARTISTS
+			if isMP3 {
+				if ffk == "ARTISTS" {
+					if len(vals) > 0 {
+						joined := strings.Join(vals, "; ")
+						args = append(args, "-metadata", fmt.Sprintf("%s=%s", "artist", joined))
+						changes++
+						setKeys["artist"] = struct{}{}
+					}
+					continue
+				}
+				if ffk == "ALBUMARTISTS" {
+					if len(vals) > 0 {
+						joined := strings.Join(vals, "; ")
+						args = append(args, "-metadata", fmt.Sprintf("%s=%s", "album_artist", joined))
+						changes++
+						setKeys["album_artist"] = struct{}{}
+					}
+					continue
+				}
+			}
+			// Default: add repeated metadata entries for formats that support it (e.g., Vorbis)
+			for _, v := range vals {
+				args = append(args, "-metadata", fmt.Sprintf("%s=%s", ffk, v))
+				changes++
+			}
+			setKeys[ffk] = struct{}{}
+		}
+	}
+	// Map cleared canonical keys to ffmpeg keys and set to empty value.
+	// For MP3, we skip ffmpeg-based clears because ID3v2 in-place removal is preferred.
+	if len(clear) > 0 && !isMP3 {
+		for ffk := range mapClearCanonicalsToFFmpeg(clear) {
+			// Avoid clearing a key we are explicitly setting in this operation,
+			// which could result in an empty extra value (e.g., trailing NUL).
+			if _, isSet := setKeys[ffk]; isSet {
+				continue
+			}
+			args = append(args, "-metadata", fmt.Sprintf("%s=", ffk))
+			changes++
+		}
+	}
+
+	// If no ffmpeg changes are needed (e.g., only clears on MP3), we can return.
+	if changes == 0 {
+		// If we performed ID3 clear or there was simply nothing to change, exit early.
+		if didID3Clear || len(clear) == 0 {
+			if isMP3 {
+				// Best-effort cleanup of numeric/empty TXXX artifacts
+				_ = cleanupNumericEmptyTXXX(real)
+			}
+			return nil
+		}
+		// Otherwise continue and let ffmpeg run (non-MP3 clears already added above).
+	}
+	args = append(args, tmp)
+
+	cmd := exec.CommandContext(ctx, "ffmpeg", args...)
+	// Capture combined output to provide actionable errors when ffmpeg fails
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("ffmpeg error: %w: %s", err, strings.TrimSpace(string(out)))
+	}
+
+	// replace original
+	if err := os.Rename(tmp, real); err != nil {
+		return err
+	}
+	if isMP3 {
+		// Post-write cleanup for numeric/empty TXXX artifacts
+		_ = cleanupNumericEmptyTXXX(real)
+	}
+	return nil
+}
+
+// applyMetadataToDir iterates all immediate files in a directory and applies
+// metadata changes to each supported audio file.
+func applyMetadataToDir(ctx context.Context, d *data, dir string, tags map[string]string, multi map[string][]string, clear []string) error {
+	// List directory entries
+	f, err := d.user.Fs.Open(dir)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	names, err := f.Readdirnames(0)
+	if err != nil {
+		return err
+	}
+
+	// Supported audio extensions for metadata updates
+	isAudio := func(ext string) bool {
+		ext = strings.ToLower(ext)
+		switch ext {
+		case ".mp3", ".flac", ".m4a", ".mp4", ".ogg", ".wav":
+			return true
+		default:
+			return false
+		}
+	}
+
+	processed := 0
+	failed := 0
+	for _, name := range names {
+		p := filepath.Join(dir, name)
+		info, err := d.user.Fs.Stat(p)
+		if err != nil {
+			// skip entries we can't stat
+			log.Printf("metadata: skip %s: %v", p, err)
+			continue
+		}
+		if info.IsDir() {
+			continue
+		}
+		if !isAudio(filepath.Ext(name)) {
+			continue
+		}
+		if err := applyMetadataWithFFmpeg(ctx, d, p, tags, multi, clear); err != nil {
+			failed++
+			log.Printf("metadata: failed for %s: %v", p, err)
+			continue
+		}
+		processed++
+	}
+
+	if processed == 0 {
+		return fmt.Errorf("no audio files found in album: %w", fberrors.ErrInvalidRequestParams)
+	}
+	if failed > 0 {
+		// Do not fail entire album operation; return success and rely on logs
+		// to indicate which files failed. This avoids a 500 when some files
+		// are temporarily locked or have unsupported formats.
+		return nil
+	}
+	return nil
+}
+
 func checkParent(src, dst string) error {
 	rel, err := filepath.Rel(src, dst)
 	if err != nil {
@@ -380,3 +730,94 @@ var diskUsage = withUser(func(w http.ResponseWriter, r *http.Request, d *data) (
 		Used:  usage.Used,
 	})
 })
+
+// applyMultiValuedTagsWithMetaflac uses metaflac to write tags to FLAC files.
+// Unlike ffmpeg, metaflac properly supports multiple values for the same tag.
+func applyMultiValuedTagsWithMetaflac(ctx context.Context, filepath string, tags map[string]string, multi map[string][]string, clear []string) error {
+	// Normalize tags and multi to proper Vorbis comment names
+	norm := normalizeAndMapToFFmpeg(tags)
+	mm := normalizeMultiToFFmpeg(multi)
+
+	// Build metaflac arguments
+	// First, remove tags that we're going to set (to avoid duplicates)
+	removeArgs := []string{}
+	for k := range norm {
+		upperK := strings.ToUpper(k)
+		removeArgs = append(removeArgs, "--remove-tag="+upperK)
+		// Also handle ALBUM_ARTIST vs "ALBUM ARTIST" variants
+		if upperK == "ALBUM_ARTIST" {
+			removeArgs = append(removeArgs, "--remove-tag=ALBUM ARTIST")
+			removeArgs = append(removeArgs, "--remove-tag=ALBUMARTIST")
+		}
+	}
+	for k := range mm {
+		removeArgs = append(removeArgs, "--remove-tag="+k)
+	}
+	// Also remove cleared tags
+	for _, c := range clear {
+		token := normalizeKey(c)
+		canonical, ok := canonicalMap[token]
+		if !ok {
+			if _, allowed := allowedCanonicals[c]; allowed {
+				canonical = c
+			} else {
+				continue
+			}
+		}
+		// Check multi-valued tags first
+		if ffk, ok := ffmpegMultiKey[canonical]; ok {
+			removeArgs = append(removeArgs, "--remove-tag="+ffk)
+		}
+		// Also check regular tags
+		if ffk, ok := ffmpegKey[canonical]; ok {
+			upperK := strings.ToUpper(ffk)
+			removeArgs = append(removeArgs, "--remove-tag="+upperK)
+			// Handle all variants of album artist
+			if canonical == "AlbumArtist" {
+				removeArgs = append(removeArgs, "--remove-tag=ALBUM ARTIST")
+				removeArgs = append(removeArgs, "--remove-tag=ALBUMARTIST")
+				removeArgs = append(removeArgs, "--remove-tag=ALBUM_ARTIST")
+			}
+			// Handle artist variants (lowercase/uppercase)
+			if canonical == "Artist" {
+				removeArgs = append(removeArgs, "--remove-tag=artist")
+				removeArgs = append(removeArgs, "--remove-tag=ARTIST")
+			}
+		}
+	}
+
+	// Execute removal first if needed
+	if len(removeArgs) > 0 {
+		removeArgs = append(removeArgs, filepath)
+		cmd := exec.CommandContext(ctx, "metaflac", removeArgs...)
+		if out, err := cmd.CombinedOutput(); err != nil {
+			return fmt.Errorf("metaflac remove failed: %w: %s", err, string(out))
+		}
+	}
+
+	// Now set the new tags
+	setArgs := []string{}
+	for k, v := range norm {
+		// Use uppercase for Vorbis comments (standard convention)
+		setArgs = append(setArgs, fmt.Sprintf("--set-tag=%s=%s", strings.ToUpper(k), v))
+	}
+	// Add multi-valued tags (each value as a separate --set-tag)
+	for k, vals := range mm {
+		for _, v := range vals {
+			setArgs = append(setArgs, fmt.Sprintf("--set-tag=%s=%s", k, v))
+		}
+	}
+
+	// If nothing to set, we're done (removal was already executed above)
+	if len(setArgs) == 0 {
+		return nil
+	}
+
+	setArgs = append(setArgs, filepath)
+	cmd := exec.CommandContext(ctx, "metaflac", setArgs...)
+	if out, err := cmd.CombinedOutput(); err != nil {
+		return fmt.Errorf("metaflac set failed: %w: %s", err, string(out))
+	}
+
+	return nil
+}

package-lock.json

@@ -0,0 +1,6 @@
+{
+  "name": "filebrowser",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}

start-dev.sh

@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PROJECT_ROOT="$(cd "$(dirname "$0")" && pwd)"
+export PATH="$HOME/.local/go/bin:$PATH"
+
+echo "Project root: $PROJECT_ROOT"
+
+# Stop any existing dev servers first
+if [ -x "$PROJECT_ROOT/stop-dev.sh" ]; then
+  echo "Stopping existing dev servers..."
+  "$PROJECT_ROOT/stop-dev.sh" || true
+fi
+
+cd "$PROJECT_ROOT"
+
+echo "Starting backend..."
+if [ -f filebrowser.log ]; then
+  mv filebrowser.log filebrowser.log.$(date +%s)
+fi
+nohup go run main.go > filebrowser.log 2>&1 &
+backend_pid=$!
+echo $backend_pid > filebrowser.pid
+echo "Backend pid: $backend_pid"
+
+echo "Waiting for backend to listen on 127.0.0.1:8080..."
+for i in $(seq 1 15); do
+  if ss -ltn | grep -q "127.0.0.1:8080"; then
+    echo "Backend listening."
+    break
+  fi
+  sleep 1
+done
+
+echo "Starting frontend (Vite)..."
+if [ ! -d "$PROJECT_ROOT/frontend" ]; then
+  echo "ERROR: frontend directory not found: $PROJECT_ROOT/frontend"
+  exit 1
+fi
+cd "$PROJECT_ROOT/frontend"
+
+if [ ! -d node_modules ]; then
+  if command -v pnpm >/dev/null 2>&1; then
+    pnpm install --no-audit --no-fund
+  else
+    npm install --no-audit --no-fund
+  fi
+fi
+
+if [ -f "$PROJECT_ROOT/frontend-dev.log" ]; then
+  mv "$PROJECT_ROOT/frontend-dev.log" "$PROJECT_ROOT/frontend-dev.log.$(date +%s)"
+fi
+
+if command -v pnpm >/dev/null 2>&1; then
+  nohup pnpm run dev > "$PROJECT_ROOT/frontend-dev.log" 2>&1 &
+  frontend_pid=$!
+else
+  nohup npm run dev > "$PROJECT_ROOT/frontend-dev.log" 2>&1 &
+  frontend_pid=$!
+fi
+echo $frontend_pid > "$PROJECT_ROOT/frontend.pid"
+echo "Frontend pid: $frontend_pid"
+
+echo "Waiting for frontend on 5173..."
+for i in $(seq 1 10); do
+  if ss -ltn | grep -q ":5173"; then
+    echo "Frontend listening."
+    break
+  fi
+  sleep 1
+done
+
+echo "Started. Backend logs: $PROJECT_ROOT/filebrowser.log"
+echo "Frontend logs: $PROJECT_ROOT/frontend-dev.log"
+echo "Open http://localhost:5173/ to use the dev UI"

stop-dev.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+PROJECT_ROOT="$(cd "$(dirname "$0")" && pwd)"
+
+echo "Stopping dev servers (project root: $PROJECT_ROOT)"
+
+# Kill backend from pid file
+if [ -f "$PROJECT_ROOT/filebrowser.pid" ]; then
+  pid=$(cat "$PROJECT_ROOT/filebrowser.pid")
+  if kill -0 "$pid" 2>/dev/null; then
+    echo "Killing backend pid $pid"
+    kill "$pid" || true
+    sleep 1
+    if kill -0 "$pid" 2>/dev/null; then
+      kill -9 "$pid" || true
+    fi
+  fi
+  rm -f "$PROJECT_ROOT/filebrowser.pid"
+fi
+
+# Kill frontend from pid file
+if [ -f "$PROJECT_ROOT/frontend.pid" ]; then
+  pid=$(cat "$PROJECT_ROOT/frontend.pid")
+  if kill -0 "$pid" 2>/dev/null; then
+    echo "Killing frontend pid $pid"
+    kill "$pid" || true
+    sleep 1
+    if kill -0 "$pid" 2>/dev/null; then
+      kill -9 "$pid" || true
+    fi
+  fi
+  rm -f "$PROJECT_ROOT/frontend.pid"
+fi
+
+# Also attempt to free ports 8080 and 5173 by killing processes listening on them (best-effort)
+pids=$(ss -ltnp | grep -E '127\.0\.0\.1:8080|:5173' | grep -oP 'pid=\K[0-9]+' | sort -u || true)
+for p in $pids; do
+  if [ -n "$p" ]; then
+    if kill -0 "$p" 2>/dev/null; then
+      echo "Killing leftover pid $p"
+      kill "$p" || true
+      sleep 1
+      if kill -0 "$p" 2>/dev/null; then
+        kill -9 "$p" || true
+      fi
+    fi
+  fi
+done
+
+echo "Stopped."