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Comment / issue / chat images uploaded inside the Desktop app rendered
as the broken-image fallback. The editor was persisting a site-relative
`/api/attachments/<id>/download` URL into markdown — that path only
resolves when the document origin proxies /api to the API host (apps/web
via Next.js rewrite). On Electron's file:// origin it never resolved.
Per GPT-Boy's plan, move the durable-URL choice from the client to the
server so the persisted shape is correct regardless of which client
performed the upload.
Server:
- AttachmentResponse gains a markdown_url field, computed by
buildMarkdownURL from the deployment policy:
• storage URL is already absolute + unsigned (public CDN, S3 public
bucket, LocalStorage with MULTICA_LOCAL_UPLOAD_BASE_URL on https) →
use it verbatim;
• CloudFront-signed mode → never expose the raw S3 URL (private
bucket); return cfg.PublicURL + /api/attachments/<id>/download so
the server can re-sign on every request;
• LocalStorage relative + cfg.PublicURL set → same prefixed API
endpoint;
• cfg.PublicURL unset → fall back to site-relative path so web's
Next.js rewrite still works.
- isDurablePublicURL helper rejects URLs carrying CloudFront / S3
signature query params, so a freshly-signed download_url can never
leak into persistence — the original MUL-3130 bug stays closed.
Frontend:
- Attachment type + AttachmentResponseSchema (and apps/mobile mirror)
carry markdown_url. Schema lenient-defaults to '' so a backend old
enough to predate this field doesn't break clients.
- useFileUpload picks markdownLink with three-layer fallback:
(1) att.markdown_url (modern server),
(2) attachmentDownloadPath(att.id) — legacy site-relative shape,
retained for backends old enough to omit markdown_url,
(3) att.url — no-workspace avatar branch with no attachment-row id.
- attachment.tsx keeps the relative→absolute absolutize pass, but
reframed as the legacy-compat fallback for already-persisted
/api/attachments/<id>/download or /uploads/<key> URLs in old
bodies. New content writes absolute URLs and skips this path.
- ContentEditor still tracks freshly-uploaded records into
AttachmentDownloadProvider so Quick Create's editor can swap the URL
via the resolver during the same session even before the server-side
binding lands.
Tests:
- server/internal/handler/file_test.go: 5 new buildMarkdownURL matrix
tests (public CDN passthrough, CloudFront-signed swap, relative
prefixing, PublicURL unset fallback, trailing-slash strip) + 15
table-driven isDurablePublicURL cases.
- packages/core/hooks/use-file-upload.test.ts: new file, 4 cases
covering modern server / legacy server / no-id avatar / oversize.
- packages/views/editor/attachment.test.tsx + content-editor.test.tsx:
10 cases for the absolutize matrix and in-session attachment merge.
- 6 existing test fixtures updated to include markdown_url.
Verification: 1236 @multica/views tests pass; 514 @multica/core tests
pass (4 new); server handler package tests pass for the new matrix
plus all pre-existing TestAttachmentToResponse* and TestDownload*
cases. Typecheck green for views/core/web/desktop. Lint clean on
touched files.
Quick Create attachment_ids binding (orphaned attachment relationship
on the resulting issue) is a follow-up — it requires a new --attachment-id
CLI flag and daemon prompt-template work and is intentionally scoped
out of this PR.
Refs: MUL-3192
Co-authored-by: Eve <eve@multica-ai.local>
Co-authored-by: multica-agent <github@multica.ai>