# External Editor API Routing

Source of truth: `docs/openapi/genarrative-external-v1.openapi.json`.

## Base

- Fixed base URL: `https://www.genarrative.world/`.
- Public contract: `GET /api/external/v1/openapi.json`.
- Authenticated calls: `Authorization: Bearer <tnr_sk_...>`.
- Default credentials file: `~/.config/genarrative/external-editor-api.json` with an `apiKey` string.
- Generation clients should allow long-running responses. Use at least 420 seconds for character animation and video; 70 seconds is too short for animation.

## Canvas Session and Art Spec

At the start of a new conversation, ask for a canvas name before the first generation call unless the user already supplied `projectId` and `assetFolderId`. Create or reuse:

1. `POST /api/external/v1/editor/projects` with `title` = canvas name.
2. `GET /api/external/v1/editor/assets/library`; if no folder has the same label, `POST /api/external/v1/editor/assets/folders` with `label` = canvas name.
3. Keep `canvasName`, `projectId`, `assetFolderId`, and the current art spec in conversation state.

Before generating art assets, normalize the user's request into a current art spec with `assetType`, `subject`, `style`, `palette`, `composition`, `format`, `constraints`, and `references`. Ask follow-up questions only for missing fields that block the selected endpoint. Reuse the current spec automatically when the user asks for another asset without changing style/spec requirements. Put the spec in `generationInputs.artSpec` and summarize it in the prompt when useful.

## Intent Routing

Infer the endpoint from the user's description. Do not present this as a menu unless the request is genuinely ambiguous.

| User says | Route |
| --- | --- |
| "生成图片", "生图", "做一张背景/角色/宣发图" | `POST /api/external/v1/editor/images/generations` |
| "重绘", "调整这张图", "基于这张图修改" | `POST /api/external/v1/editor/images/edits` |
| "用这张参考图", "参考本地图片生成", "基于本地图做图" | Upload local image first, then pass returned `objectKey` into the generation/edit reference field |
| "按规范图生成图标", "拆图标" | `POST /api/external/v1/editor/icon-spritesheets/generations` |
| "从 UI 设计图提取素材" | `POST /api/external/v1/editor/ui-designs/assets/extractions` |
| "让角色动起来", "生成角色动画帧" | `POST /api/external/v1/editor/character-animations/generations` |
| "生成视频" | `POST /api/external/v1/editor/videos/generations` |
| "生成音效" | `POST /api/external/v1/editor/audios/sound-effects/generations` |
| "生成背景音乐/BGM" | `POST /api/external/v1/editor/audios/background-music/generations` |
| "上传本地素材/图片/音频/视频" | Upload flow: direct upload ticket -> OSS form upload -> object confirm |
| "保存画板布局" | `PATCH /api/external/v1/editor/projects/{projectId}/canvas` |
| "创建/读取/删除画板项目" | Project endpoints |
| "素材库/文件夹/素材记录" | Asset library endpoints |
| "读取私有素材/拿可访问链接" | `GET /api/external/v1/assets/read-url` |

Ask a follow-up only when two routes could both be correct and produce different artifacts, for example "处理这张图" without saying edit, extract UI assets, or use it as a reference for new generation.

## Endpoint Map

| User intent | Endpoint | Minimum request |
| --- | --- | --- |
| Read contract | `GET /api/external/v1/openapi.json` | No auth required |
| List projects | `GET /api/external/v1/editor/projects` | API Key |
| Create project | `POST /api/external/v1/editor/projects` | Optional `title` |
| Load recent project | `GET /api/external/v1/editor/projects/recent` | API Key |
| Get/delete project | `GET` or `DELETE /api/external/v1/editor/projects/{projectId}` | `projectId` |
| Rename project | `PATCH /api/external/v1/editor/projects/{projectId}/metadata` | `title` |
| Save canvas layout | `PATCH /api/external/v1/editor/projects/{projectId}/canvas` | `viewport`, `layers` |
| Add project resource | `POST /api/external/v1/editor/projects/{projectId}/resources` | `imageSrc`, `width`, `height`, `sourceType` |
| Create upload ticket | `POST /api/external/v1/assets/direct-upload-tickets` | `legacyPrefix`, `fileName` |
| Confirm uploaded object | `POST /api/external/v1/assets/objects/confirm` | `objectKey`, `assetKind` |
| Get signed read URL | `GET /api/external/v1/assets/read-url` | `objectKey` or `legacyPublicPath` |
| Read asset library | `GET /api/external/v1/editor/assets/library` | API Key |
| Create/update/delete folder | `POST /api/external/v1/editor/assets/folders`, `PATCH`/`DELETE /api/external/v1/editor/assets/folders/{folderId}` | create: `label`; update: `label` or `collapsed` |
| Create asset record | `POST /api/external/v1/editor/assets` | `folderId`, `label`, `imageSrc`, `width`, `height`, `sourceType` |
| Update/delete asset | `PATCH`/`DELETE /api/external/v1/editor/assets/{assetId}` | update: `label` or `folderId` |

## Generation Endpoints

| User intent | Endpoint | Required fields | Common optional fields |
| --- | --- | --- | --- |
| Generate image/spec/character/UI/publication material | `POST /api/external/v1/editor/images/generations` | `prompt` | `kind`, `model`, `aspectRatio`, `imageSize`, `size`, `referenceImageSrcs`, `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs` |
| Edit/redraw image | `POST /api/external/v1/editor/images/edits` | `prompt`, `sourceImageSrc` | `referenceImageSrcs`, `model`, `size`, `projectId`, `assetFolderId`, `assetLabel`, `sourceResourceId`, `targetLayerId`, `canvasCompletion` |
| Generate icon spritesheet | `POST /api/external/v1/editor/icon-spritesheets/generations` | `referenceImageSrc`, `iconDescriptions` | `referenceImageSrcs`, `model`, `aspectRatio`, `imageSize`, `projectId`, `assetFolderId`, `canvasCompletion` |
| Extract assets from UI design | `POST /api/external/v1/editor/ui-designs/assets/extractions` | `sourceImageSrc`, `aspectRatio`, `imageSize` | `model`, `referenceImageSrcs`, `projectId`, `assetFolderId`, `spritesheetLabel`, `canvasCompletion` |
| Generate character animation | `POST /api/external/v1/editor/character-animations/generations` | `sourceLayerId`, `sourceImageSrc`, `sourceWidth`, `sourceHeight`, `promptText`, `resolution`, `ratio`, `frameCount`, `durationSeconds`, `model` | `projectId`, `sourceResourceId`, `canvasCompletion`; then create a library asset from the first returned frame |
| Generate video | `POST /api/external/v1/editor/videos/generations` | `prompt`, `model`, `aspectRatio`, `durationSeconds`, `resolution`, `mode`, `sound` | `referenceImageSrcs`, `referenceVideoSrcs`, `referenceAudioSrcs`, `webSearchEnabled`, `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion` |
| Generate sound effect | `POST /api/external/v1/editor/audios/sound-effects/generations` | `prompt`, `duration` | `model`, `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs` |
| Generate background music | `POST /api/external/v1/editor/audios/background-music/generations` | `gptDescriptionPrompt`, `makeInstrumental` | `projectId`, `assetFolderId`, `assetLabel`, `canvasCompletion`, `generationInputs` |

All generation requests should be placed into both the current canvas and its same-name asset-library folder. For endpoints that support `assetLabel`, pass it. For UI extraction, use `spritesheetLabel`. For icon spritesheet, the folder is enough. For character animation, the endpoint does not return `asset`; after success call `POST /api/external/v1/editor/assets` using the first returned frame as `imageSrc`, the session `assetFolderId`, and `assetKind: "character-animation"`.

## HTTP 2xx Warning Handling

Character image generation (including character redraw through `kind: "character"`), icon spritesheet generation, and UI asset extraction may return HTTP 2xx while carrying a structured `warning`; completion does not imply that all post-processed derivatives exist.

- Consume the returned `project` and media snapshots as authoritative: character responses use `resource` / `asset`, while icon spritesheet and UI extraction responses use `spritesheetResource` / `spritesheetAsset`. `warning.code: "postprocess-failed-source-preserved"` means the saved provider source is the main result. Character output has no transparent derivative, while icon spritesheet and UI extraction have no transparent spritesheet and no slices. Display `warning.reason` directly; do not construct missing assets or retry the provider generation from scratch.
- `sliceWarning` is only for a transparent spritesheet that was created successfully but could not be split automatically. Use the complete transparent spritesheet and preserve `sliceWarning.reason` as the original diagnostic; it is not a post-processing/source-preserved warning.
- The service contract keeps `warning` and `sliceWarning` mutually exclusive. If a malformed response contains both, prioritize the general `warning` over `sliceWarning` defensively.

## Reference Image Upload

If the user provides a local file as a reference image, run upload before the generation request:

1. `POST /api/external/v1/assets/direct-upload-tickets`.
   Use `legacyPrefix: "generated-character-drafts"`, `pathSegments: ["editor", "external-editor-references"]`, original `fileName`, detected image `contentType`, and `access: "private"`.
2. Upload the file to the returned OSS form endpoint with all returned `formFields`.
3. `POST /api/external/v1/assets/objects/confirm` with returned `objectKey`, detected `contentType`, `contentLength` if known, `assetKind: "editor_reference_image"`, and `accessPolicy: "private"`.
4. Use the returned `objectKey` in the actual editor request.

OSS form upload uses `upload.host` and every non-null `upload.formFields` entry, then the file part named `file`. Default responses expose `upload`; envelope responses expose `data.upload`. Save the upload ticket response as `ticket.json`:

```bash
node - <<'NODE' ticket.json /path/to/reference.png
const fs = require('fs');
const path = require('path');

(async () => {
  const body = JSON.parse(fs.readFileSync(process.argv[2], 'utf8'));
  const ticket = body.upload || body.data?.upload;
  if (!ticket) throw new Error('Upload ticket response missing upload payload');
  const filePath = process.argv[3];
  const form = new FormData();
  for (const [key, value] of Object.entries(ticket.formFields)) {
    if (value != null) form.append(key, value);
  }
  const bytes = fs.readFileSync(filePath);
  form.append(
    'file',
    new Blob([bytes], { type: ticket.contentType || 'application/octet-stream' }),
    path.basename(filePath),
  );
  const response = await fetch(ticket.host, { method: 'POST', body: form });
  if (!response.ok) {
    throw new Error(`OSS upload failed: ${response.status} ${await response.text()}`);
  }
})().catch((error) => {
  console.error(error.message);
  process.exit(1);
});
NODE
```

Field mapping after upload:

| Target API | Put uploaded `objectKey` in |
| --- | --- |
| Image generation | `referenceImageSrcs` |
| Image edit/redraw | `sourceImageSrc`; additional references in `referenceImageSrcs` |
| Icon spritesheet | `referenceImageSrc`; additional style refs in `referenceImageSrcs` |
| UI design extraction | `sourceImageSrc`; additional refs in `referenceImageSrcs` |
| Character animation | `sourceImageSrc` |
| Video generation with image references | `referenceImageSrcs` |

Do not put the signed read URL into generation fields. Signed URLs are for user-visible preview/download; generation fields should use the stable `objectKey` for uploaded private references.

## Common Enums

- Image `kind`: `spec`, `character`, `quick-edit`, `ui-design`, `publication-material`.
- Image `model`: `gpt-image-2`, `gemini-3.1-flash-image-preview`, `nanobanana2`, `nano-banana`.
- Image `aspectRatio`: `1:1`, `2:3`, `3:2`, `9:16`, `16:9`.
- Image `imageSize`: `0.5K`, `1K`, `2K`.
- Video `model`: `seedance2.0`, `seedance2.0-fast`, `kling3.0`, `kling3.0-omni`, `veo3.1`, `veo3.1-fast`.
- Video `aspectRatio`: `16:9`, `9:16`, `1:1`, `4:3`, `3:4`, `21:9`.
- Video `resolution`: `480p`, `720p`, `1080p`.
- Video `mode`: always `std`.
- Video `sound`: `on`, `off`.
- Character animation `model`: always `seedance2.0-fast`.
- Character animation `resolution`: `480p`, `720p`; `frameCount`: `32`, `40`, `48`; `durationSeconds`: `4`, `5`, `6`; `ratio`: `same`, `1:1`, `4:3`, `16:9`, `9:16`, `3:4`.

## Local Reference Media Details

- `contentLength` in object confirm is a JSON number from local byte size, not a string.
- For character animation, use an existing project layer ID as `sourceLayerId` when available.
- If the source is only an uploaded local image, derive `sourceLayerId` from the file name, such as `external-reference-hero`, and keep it stable across retries.
- Read `sourceWidth` and `sourceHeight` from the local image. If dimensions cannot be read, ask instead of inventing dimensions.
- UI design extraction uses fixed `aspectRatio: "1:1"`; choose `imageSize: "1K"` for normal/small extractions and `2K` for dense designs.
- Video image/video/audio references are supported only by the Seedance 2.0 family; default referenced-media video requests to `model: "seedance2.0-fast"`, `mode: "std"`, and explicit `sound`.
- Image edit/redraw can pass `targetLayerId` with `projectId` to replace an existing canvas layer when no explicit `canvasCompletion` is supplied.
- Image, edit, video, sound effect, and BGM generation can pass `assetFolderId` and `assetLabel`; response `asset` is the created/updated library record.
- Icon spritesheet and UI extraction can pass `assetFolderId`; UI extraction can also pass `spritesheetLabel`.

## Canvas Completion

Use `canvasCompletion` for generation in this skill so the generated result is written back into the project canvas by the backend.

Required:

```json
{
  "title": "素材名称",
  "placeholder": {
    "x": 0,
    "y": 0,
    "width": 512,
    "height": 512,
    "originalWidth": 512,
    "originalHeight": 512
  }
}
```

`dialogId` is optional. If the response includes `project`, `resource`, or `asset`, use those snapshots instead of reconstructing canvas/resource/library state locally.

## Upload Flow

For a local file that should become a project resource or library asset:

1. `POST /api/external/v1/assets/direct-upload-tickets` with `legacyPrefix`, `fileName`, and optional `contentType`, `access`, `maxSizeBytes`.
2. Submit the file to the returned OSS form endpoint with returned `formFields`.
3. `POST /api/external/v1/assets/objects/confirm` with returned `objectKey` and an `assetKind`.
4. Create a project resource or library asset with the confirmed `assetObjectId`/`objectKey`.

For reading private/generated assets, call `GET /api/external/v1/assets/read-url?objectKey=...` and use the returned `signedUrl`.