openapi: "3.0.3"
info:
  title: "Imputnet Cobalt API"
  description: >
    OpenAPI specification for the Imputnet Cobalt API. This API provides endpoints 
    for retrieving content (such as videos or images) from various services and for 
    obtaining authentication tokens. Note: Official hosted instances (e.g. 
    "api.cobalt.tools") may enforce bot protection; self-hosting or obtaining 
    explicit access is recommended.
  version: "1.0.0"
servers:
  - url: "https://api.cobalt.tools"
    description: "Example public API instance (may require permission)"
  - url: "http://localhost:9000"
    description: "Local instance for self-hosting (default port 9000)"
security:
  - ApiKeyAuth: []
  - BearerAuth: []
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: "API Key authentication via 'Authorization: Api-Key <API_TOKEN>'"
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: "Bearer JWT authentication via 'Authorization: Bearer <JWT_TOKEN>' (obtained from the /session endpoint)"
  schemas:
    DownloadRequest:
      type: object
      required:
        - url
      description: "Request payload for content download. Must include a target URL and can specify optional parameters (quality, format, etc.)."
      properties:
        url:
          type: string
          format: uri
          description: "The URL of the content to download (required)."
        videoQuality:
          type: string
          enum: ["144", "240", "360", "480", "720", "1080", "1440", "2160", "4320", "max"]
          description: "Video resolution quality (e.g., '144', '720', '1080', up to '4320' or 'max')."
        audioFormat:
          type: string
          enum: ["best", "mp3", "ogg", "wav", "opus"]
          description: "Audio format for extraction or conversion."
        audioBitrate:
          type: string
          enum: ["320", "256", "128", "96", "64", "8"]
          description: "Audio bitrate in kbps for conversion; applies only when converting to audio."
        filenameStyle:
          type: string
          enum: ["classic", "pretty", "basic", "nerdy"]
          description: "File naming style for the output file."
        downloadMode:
          type: string
          enum: ["auto", "audio", "mute"]
          description: "Download mode: 'auto' (video with audio), 'audio' (audio-only), or 'mute' (video without audio)."
        youtubeVideoCodec:
          type: string
          enum: ["h264", "av1", "vp9"]
          description: "Preferred video codec for YouTube downloads."
        youtubeDubLang:
          type: string
          description: "Language code for dubbed audio on YouTube (if applicable), e.g. 'en', 'ru', 'ja', 'es-US'."
        alwaysProxy:
          type: boolean
          description: "If true, forces all downloads to proxy through the server."
        disableMetadata:
          type: boolean
          description: "If true, do not embed metadata (like title or artist tags) in the output file."
        tiktokFullAudio:
          type: boolean
          description: "If true, download the original sound for a TikTok video when available."
        tiktokH265:
          type: boolean
          description: "If true, allow H.265/HEVC video for TikTok (and Xiaohongshu) if available."
        twitterGif:
          type: boolean
          description: "If true, convert Twitter 'GIFs' (video format) into actual .gif files."
        youtubeHLS:
          type: boolean
          description: "If true, use HLS streaming for YouTube video/audio downloads when available."
    RedirectResponse:
      type: object
      required:
        - status
        - url
        - filename
      description: "Response indicating the client should be redirected to an external URL for the content."
      properties:
        status:
          type: string
          enum: ["redirect"]
          description: "Redirect status indicator."
        url:
          type: string
          format: uri
          description: "External URL to download the content directly."
        filename:
          type: string
          description: "Suggested filename for the downloaded content."
    TunnelResponse:
      type: object
      required:
        - status
        - url
        - filename
      description: "Response indicating the content is being proxied (tunneled) through the Cobalt server."
      properties:
        status:
          type: string
          enum: ["tunnel"]
          description: "Tunnel status indicator."
        url:
          type: string
          format: uri
          description: "Cobalt tunnel URL to fetch the content via the server proxy."
        filename:
          type: string
          description: "Suggested filename for the downloaded content."
    PickerItem:
      type: object
      required:
        - type
        - url
      description: "An individual media entry available for selection (in a picker response)."
      properties:
        type:
          type: string
          enum: ["photo", "video", "gif"]
          description: "Type of media item (photo, video, or gif)."
        url:
          type: string
          format: uri
          description: "Direct URL of the media item."
        thumb:
          type: string
          format: uri
          description: "Thumbnail URL for the media (optional)."
    PickerResponse:
      type: object
      required:
        - status
        - picker
      description: "Response indicating multiple media items to choose from (e.g., an image slideshow)."
      properties:
        status:
          type: string
          enum: ["picker"]
          description: "Picker status indicator."
        audio:
          type: string
          format: uri
          description: "URL to a background audio track (if the content has separate audio)."
        audioFilename:
          type: string
          description: "Filename for the audio track, if provided."
        picker:
          type: array
          description: "Array of media items available for selection."
          items:
            $ref: "#/components/schemas/PickerItem"
    ErrorContext:
      type: object
      description: "Optional additional context for an error, providing extra details."
      properties:
        service:
          type: string
          description: "Service/source involved in the error (e.g., 'youtube')."
        limit:
          type: number
          description: "Numeric limit related to the error (e.g., rate limit or duration limit)."
    ErrorDetail:
      type: object
      required:
        - code
      description: "Error details object containing a code and optional context information."
      properties:
        code:
          type: string
          description: "Machine-readable error code explaining the reason."
        context:
          $ref: "#/components/schemas/ErrorContext"
    ErrorResponse:
      type: object
      required:
        - status
        - error
      description: "Response indicating an error occurred during the request."
      properties:
        status:
          type: string
          enum: ["error"]
          description: "Error status indicator."
        error:
          $ref: "#/components/schemas/ErrorDetail"
    ServerInfoResponse:
      type: object
      required:
        - cobalt
        - git
      description: "Server status information, including Cobalt instance details and git info."
      properties:
        cobalt:
          type: object
          description: "Information about the Cobalt instance."
          properties:
            version:
              type: string
              description: "Current version of the Cobalt server instance."
            url:
              type: string
              description: "Base URL of the server instance."
            startTime:
              type: number
              description: "Server start time (Unix timestamp in milliseconds)."
            durationLimit:
              type: number
              description: "Maximum allowed video duration for downloads (in seconds)."
            services:
              type: array
              items:
                type: string
              description: "List of supported service names for this instance."
          required:
            - version
            - url
            - startTime
            - durationLimit
            - services
        git:
          type: object
          description: "Git repository information for the running codebase."
          properties:
            commit:
              type: string
              description: "Git commit hash of the currently running code."
            branch:
              type: string
              description: "Git branch name of the currently running code."
            remote:
              type: string
              description: "Git remote URL of the repository."
          required:
            - commit
            - branch
            - remote
    SessionResponse:
      type: object
      required:
        - token
        - exp
      description: "Response containing a newly issued JWT token and its expiration time."
      properties:
        token:
          type: string
          description: "JWT token to use for Bearer authentication in subsequent requests."
        exp:
          type: number
          description: "Token lifetime (expiration time in seconds from issuance)."
paths:
  "/":
    get:
      summary: "Get Server Information"
      description: "Retrieve basic information about the Cobalt server instance (version, uptime, supported services, etc.)."
      responses:
        "200":
          description: "Server info retrieved successfully"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ServerInfoResponse"
              examples:
                example:
                  summary: "Example server info"
                  value:
                    cobalt:
                      version: "1.0.0"
                      url: "https://api.cobalt.tools"
                      startTime: 1700000000000
                      durationLimit: 600
                      services:
                        - "youtube"
                        - "tiktok"
                        - "twitter"
                    git:
                      commit: "abcdef1234567890"
                      branch: "main"
                      remote: "https://github.com/imputnet/cobalt.git"
        "401":
          description: "Unauthorized – missing or invalid API key/Bearer token"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
              examples:
                authRequired:
                  summary: "Authentication required error"
                  value:
                    status: "error"
                    error:
                      code: "api.auth.api-key.missing"
                      context: {}
        default:
          description: "Unexpected error"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
              examples:
                errorExample:
                  summary: "General error example"
                  value:
                    status: "error"
                    error:
                      code: "error.api.fetch.critical"
                      context:
                        service: "youtube"
    post:
      summary: "Process Download Request"
      description: >
        Submit a URL to download content. The server will process the request and respond with 
        either a direct link, a proxy tunnel, a picker for multiple items, or an error.
        **Headers**: This endpoint requires 'Accept: application/json' and 'Content-Type: application/json'.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/DownloadRequest"
            example:
              url: "https://youtu.be/dQw4w9WgXcQ"
              videoQuality: "720"
              audioFormat: "mp3"
              downloadMode: "audio"
      responses:
        "200":
          description: "Request processed successfully (see 'status' field for result type)"
          content:
            application/json:
              schema:
                oneOf:
                  - $ref: "#/components/schemas/RedirectResponse"
                  - $ref: "#/components/schemas/TunnelResponse"
                  - $ref: "#/components/schemas/PickerResponse"
              examples:
                redirect:
                  summary: "Redirect response example"
                  value:
                    status: "redirect"
                    url: "https://example.com/path/to/content.mp4"
                    filename: "video.mp4"
                tunnel:
                  summary: "Tunnel response example"
                  value:
                    status: "tunnel"
                    url: "https://api.cobalt.tools/tunnel/123e4567-e89b-12d3-a456-426614174000"
                    filename: "video.mp4"
                picker:
                  summary: "Picker response example"
                  value:
                    status: "picker"
                    audio: "https://api.cobalt.tools/tunnel/audio/abc12345.mp3"
                    audioFilename: "background_audio.mp3"
                    picker:
                      - type: "photo"
                        url: "https://api.cobalt.tools/tunnel/image1.jpg"
                        thumb: "https://api.cobalt.tools/tunnel/image1_thumb.jpg"
                      - type: "photo"
                        url: "https://api.cobalt.tools/tunnel/image2.jpg"
                        thumb: "https://api.cobalt.tools/tunnel/image2_thumb.jpg"
        "400":
          description: "Bad request or processing error"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
              examples:
                processingError:
                  summary: "Processing error example"
                  value:
                    status: "error"
                    error:
                      code: "error.api.fetch.critical"
                      context:
                        service: "youtube"
        "401":
          description: "Unauthorized – missing or invalid API key/Bearer token"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
              examples:
                authError:
                  summary: "Authentication error example"
                  value:
                    status: "error"
                    error:
                      code: "api.auth.bearer.missing"
                      context: {}
        default:
          description: "Unexpected server error"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
  "/session":
    post:
      summary: "Create Session Token"
      description: >
        Generate a short-lived JWT token (Bearer) by proving a successful Turnstile challenge solution.
        The client must provide the Turnstile response token in the 'cf-turnstile-response' header.
      security: []
      parameters:
        - name: "cf-turnstile-response"
          in: header
          required: true
          schema:
            type: string
          description: "Turnstile challenge response token provided by the client."
      responses:
        "200":
          description: "A new JWT token has been issued."
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/SessionResponse"
              example:
                token: "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...<snip>"
                exp: 1800
        "400":
          description: "Invalid or missing challenge response (token not provided or verification failed)."
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
              examples:
                challengeError:
                  summary: "Challenge failure example"
                  value:
                    status: "error"
                    error:
                      code: "api.auth.turnstile.missing"
                      context: {}
        default:
          description: "Unexpected error during token generation."
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ErrorResponse"
              examples:
                errorExample:
                  summary: "General error example"
                  value:
                    status: "error"
                    error:
                      code: "error.unknown"
                      context: {}