- Sanitize Content-Disposition filenames to prevent header injection (strip control chars, quotes, semicolons)
- Add CloudFront cookie refresh middleware so cookies are re-issued when expired
- Log errors in groupAttachments instead of silently swallowing them
- Move useFileUpload hook to shared/hooks/ per project architecture conventions
- Add uploadWithToast helper to deduplicate try/catch/toast pattern across 3 components
- Refactor ApiClient.uploadFile to reuse auth headers, 401 handling, and error parsing
- Allow empty MIME types client-side (let server sniff and decide)
- Constrain Image extension max-width in rich-text-editor to prevent layout overflow
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add CloudFrontSigner.SignedURL() for generating per-resource signed URLs
- Attachment responses include download_url (5-min signed URL for CLI)
- Eager load attachments on comments and timeline (same pattern as reactions)
- Add ListAttachmentsByCommentIDs query for batch loading
- Update Comment and TimelineEntry types with attachments field
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Add attachment table with workspace/issue/comment associations
- Upload handler creates attachment record when workspace context exists
- Add GET /api/issues/{id}/attachments and DELETE /api/attachments/{id}
- Frontend passes issueId context during uploads for tracking
- Add Attachment type, listAttachments, deleteAttachment to API client
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Single-purpose bucket with randomized hex keys doesn't benefit from
a prefix — no lifecycle policies or access controls scoped to it.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Use http.DetectContentType() instead of trusting client-declared MIME type
- Sanitize quotes in filename for Content-Disposition header injection
- Add uploads/ prefix to S3 keys for better organization
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add POST /api/upload-file endpoint that uploads files to S3 and returns
CDN URLs protected by CloudFront signed cookies (same pattern as Linear).
Infrastructure:
- Two private S3 buckets (static.multica.ai, static-staging.multica.ai)
- Two CloudFront distributions with OAC and Trusted Key Groups
- ACM wildcard cert in us-east-1, DNS records in Route 53
- RSA signing key stored in AWS Secrets Manager
Backend:
- S3 storage service with CloudFront CDN domain support
- CloudFront signed cookie generation (RSA-SHA1)
- Private key loaded from Secrets Manager (env var fallback for local dev)
- Cookies set on login (VerifyCode) with 72h expiry matching JWT
- Upload handler: multipart form → S3 → CloudFront URL response
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
