iOS (Swift) — primary path, since iOS is the live platform:
- ImageDownsampler.swift: ImageIO/CGImageSourceCreateThumbnailAtIndex
based resize. Pays only the cost of the resized bitmap rather than
decoding the full source — a 12 MP iPhone photo previously
materialized ~50 MB regardless of JPEG size. Profiles: completion
(2048 px / quality 0.85), document_image (2560 px / 0.90).
- PresignedUploader.swift: three-step orchestration (POST /uploads/presign
→ multipart POST direct to B2 with the signed policy fields → return
upload_id). Maps HTTP errors to user-facing copy. Concurrent uploads
via TaskGroup.
- CompleteTaskView.swift: replaces the multipart-with-images path with
downsample → upload-to-B2 → create-completion-with-upload_ids[]. The
no-image branch unchanged.
Android (Kotlin) — parity:
- composeApp/.../media/ImageDownsampler.kt: BitmapFactory inSampleSize
+ proportional scale + JPEG compress. Same profiles as iOS.
- composeApp/.../network/UploadApi.kt: Ktor-based presign + direct-to-B2
POST. Preserves form-field order so the S3 policy signature validates.
- APILayer.uploadImage(category, contentType, bytes, fileName) → upload_id.
UI integration to follow.
Shared (Kotlin):
- models/TaskCompletion.kt: added uploadIds: List<Int>? to
TaskCompletionCreateRequest and a new PresignUploadRequest /
PresignUploadResponse pair matching the Go API DTOs.
- Existing call sites (WidgetActionProcessor, PushNotificationManager)
explicitly pass uploadIds: nil for backwards compatibility — Swift's
bridge to Kotlin doesn't honor Kotlin defaults for required-positional
parameters.
The legacy multipart path remains functional alongside the new one for
soak-test purposes; per-platform feature flags can flip between them at
any time. After zero multipart traffic in production for 7 consecutive
days, the legacy paths can be dropped.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Trey t
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