fix: a Discord source takes only messages with an image attached, from the posters it names, and knows its channel's name (#4481)

- A message with no image or video attachment is chat: extract_media returns
  nothing for it, so nothing downloads and no post record is written. A
  message that passes keeps every file, numbered as gallery-dl numbers them.
- `discord_authors` in a source's config limits the walk to those posters
  (id, username or display name); the edit dialog has a field for it and no
  longer drops config keys it has no field for.
- source.display_name (migration 0115), refreshed by every Discord walk, shows
  on Subscriptions in place of the two-id URL; a Discord post card names its
  channel from the record's `channel`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/components/posts/PostCard.vue

@@ -26,6 +26,7 @@
         :to="{ name: 'artist', params: { slug: post.artist.slug } }"
         class="fc-post-card__artist"
       >{{ post.artist.name }}</RouterLink>
+      <span v-if="post.channel" class="fc-post-card__meta">#{{ post.channel }}</span>
       <span class="fc-post-card__date" :title="absoluteDate">{{ relativeDate }}</span>
       <span v-if="totalImages" class="fc-post-card__meta">
         · {{ totalImages }} image{{ totalImages === 1 ? '' : 's' }}

frontend/src/components/subscriptions/SourceCard.vue

@@ -16,7 +16,7 @@
       <a
         :href="source.url" target="_blank" rel="noopener"
         class="fc-source-card__url" @click.stop
-      >{{ source.url }}</a>
+      >{{ source.display_name || source.url }}</a>
       <v-btn
         icon="mdi-pencil" size="x-small" variant="text"
         @click.stop="$emit('edit', source)"

frontend/src/components/subscriptions/SourceFormDialog.vue

@@ -44,6 +44,14 @@
               v-model="structuredSince" label="Skip posts older than (YYYY-MM-DD)"
               placeholder="2024-01-01" hide-details class="mt-2"
             />
+            <!-- A creator's server is full of other members posting their own
+                 pictures; the source is subscribed to the creator (#4481). -->
+            <v-text-field
+              v-if="platform === 'discord'"
+              v-model="structuredAuthors" label="Only posts by (Discord names or ids)"
+              placeholder="Todding" hint="Comma-separated. Empty takes everyone's."
+              persistent-hint class="mt-2"
+            />
             <p class="text-caption mt-2" style="opacity: 0.75">
               More per-platform fields land here over time. Use Advanced JSON for everything else.
             </p>
@@ -98,6 +106,24 @@ const urlError = ref('')
 const configTab = ref('structured')
 const structuredVideos = ref(true)
 const structuredSince = ref('')
+const structuredAuthors = ref('')
+// Keys the structured view has no field for, carried through its saves so
+// switching tabs never drops what the JSON view set.
+const otherConfig = ref({})
+const STRUCTURED_KEYS = ['videos', 'since', 'discord_authors']
+
+function splitAuthors(txt) {
+  return (txt || '').split(',').map(s => s.trim()).filter(Boolean)
+}
+
+function takeConfig(co) {
+  structuredVideos.value = co.videos !== false
+  structuredSince.value = co.since ?? ''
+  structuredAuthors.value = Array.isArray(co.discord_authors) ? co.discord_authors.join(', ') : ''
+  otherConfig.value = Object.fromEntries(
+    Object.entries(co).filter(([k]) => !STRUCTURED_KEYS.includes(k)),
+  )
+}
 const jsonText = ref('{}')
 const jsonError = ref('')
 
@@ -105,13 +131,15 @@ const busy = ref(false)
 
 // Sync config_overrides between the two views.
 const config = computed(() => {
-  const out = {}
+  const out = { ...otherConfig.value }
   if (!structuredVideos.value) out.videos = false
   if (structuredSince.value) out.since = structuredSince.value
+  const authors = splitAuthors(structuredAuthors.value)
+  if (authors.length) out.discord_authors = authors
   return out
 })
 
-watch([structuredVideos, structuredSince], () => {
+watch([structuredVideos, structuredSince, structuredAuthors], () => {
   if (configTab.value === 'structured') {
     jsonText.value = JSON.stringify(config.value, null, 2)
     jsonError.value = ''
@@ -128,8 +156,7 @@ watch(jsonText, (txt) => {
     }
     jsonError.value = ''
     // Reflect recognized keys into the structured view.
-    structuredVideos.value = parsed.videos !== false
-    structuredSince.value = parsed.since ?? ''
+    takeConfig(parsed)
   } catch {
     jsonError.value = 'Invalid JSON'
   }
@@ -146,14 +173,13 @@ watch(() => props.modelValue, async (open) => {
     url.value = props.source.url
     enabled.value = props.source.enabled
     const co = props.source.config_overrides || {}
-    structuredVideos.value = co.videos !== false
-    structuredSince.value = co.since ?? ''
+    takeConfig(co)
     jsonText.value = JSON.stringify(co, null, 2)
     artistChoice.value = { id: props.source.artist_id, name: props.source.artist_name }
   } else {
     platform.value = platformsStore.list[0]?.key || 'patreon'
     url.value = ''; enabled.value = true
-    structuredVideos.value = true; structuredSince.value = ''
+    takeConfig({})
     jsonText.value = '{}'
     artistChoice.value = props.initialArtist
       ? { id: props.initialArtist.id, name: props.initialArtist.name }

frontend/src/components/subscriptions/SourceRow.vue

@@ -10,7 +10,7 @@
       <div class="fc-source-row__url-wrap">
         <a :href="source.url" target="_blank" rel="noopener" class="fc-source-row__url"
            @click.stop>
-          {{ source.url }}
+          {{ source.display_name || source.url }}
         </a>
         <!-- Edit sits next to the source identity (operator-requested), not in
              the action cluster where it was easy to fat-finger Remove. -->

frontend/src/components/subscriptions/SubscriptionsTab.vue

@@ -108,7 +108,7 @@
             v-if="item.singleSource"
             :href="item.singleSource.url" target="_blank" rel="noopener"
             class="fc-subs__sub-url" @click.stop
-          >{{ item.singleSource.url }}</a>
+          >{{ item.singleSource.display_name || item.singleSource.url }}</a>
         </template>
 
         <template #item.platforms="{ item }">
@@ -517,6 +517,7 @@ const filteredGroups = computed(() => {
         g.sources.some(
           (s) =>
             (s.url || '').toLowerCase().includes(q) ||
+            (s.display_name || '').toLowerCase().includes(q) ||
             (s.platform || '').toLowerCase().includes(q),
         ),
     )