openapi: 3.1.0
info:
  title: File Access Agent API
  version: 0.1.0
  description: >
    File Access Agent controls access to files stored in bucket / file space.
    Upload uses Member Center JWT access tokens. Download uses delegated short-lived
    tokens issued and validated by Member Center. Deployment model is single-tenant
    per instance, and service is stateless by default without a required DB.

servers:
  - url: http://localhost:5081
    description: Local development

tags:
  - name: Files
  - name: System

paths:
  /files/{objectKey}:
    put:
      tags: [Files]
      summary: Upload file
      description: >
        Upload a file through File Access Agent. Requires a Member Center JWT access token
        with audience `file_access_api`, scope `files:upload.write`, and claim `tenant_id`.
      security:
        - BearerAuth: [files:upload.write]
      parameters:
        - in: path
          name: objectKey
          required: true
          schema:
            type: string
          description: URL-encoded object key
        - in: header
          name: X-File-Id
          required: false
          schema:
            type: string
      requestBody:
        required: true
        content:
          application/octet-stream:
            schema:
              type: string
              format: binary
          multipart/form-data:
            schema:
              type: object
              required: [file]
              properties:
                file:
                  type: string
                  format: binary
      responses:
        '201':
          description: File uploaded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FileObjectResponse'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: Conflict
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '413':
          description: Payload too large
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
    get:
      tags: [Files]
      summary: Download file
      description: >
        Download a file through File Access Agent using a delegated short-lived token
        previously issued by Member Center.
      security:
        - BearerAuth: [files:download.read]
      parameters:
        - in: path
          name: objectKey
          required: true
          schema:
            type: string
          description: URL-encoded object key
      responses:
        '200':
          description: File stream
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: File not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
    head:
      tags: [Files]
      summary: Check file metadata headers
      description: >
        Return file existence and metadata headers without the body.
        Requires a Member Center JWT access token with scope `files:metadata.read`.
      security:
        - BearerAuth: [files:metadata.read]
      parameters:
        - in: path
          name: objectKey
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Metadata headers returned
        '401':
          description: Unauthorized
        '403':
          description: Forbidden
        '404':
          description: File not found
    delete:
      tags: [Files]
      summary: Delete file
      description: >
        Delete a file through File Access Agent. Requires a Member Center JWT access token
        with scope `files:delete`.
      security:
        - BearerAuth: [files:delete]
      parameters:
        - in: path
          name: objectKey
          required: true
          schema:
            type: string
      responses:
        '204':
          description: File deleted
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: File not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'

  /files/metadata/{objectKey}:
    get:
      tags: [Files]
      summary: Get file metadata
      description: >
        Read file metadata without returning the file body.
        Requires a Member Center JWT access token with scope `files:metadata.read`.
      security:
        - BearerAuth: [files:metadata.read]
      parameters:
        - in: path
          name: objectKey
          required: true
          schema:
            type: string
      responses:
        '200':
          description: File metadata
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FileObjectResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Forbidden
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: File not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'

  /health:
    get:
      tags: [System]
      summary: Health check
      responses:
        '200':
          description: Service healthy
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HealthResponse'

components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT or delegated token

  schemas:
    FileObjectResponse:
      type: object
      required:
        - tenant_id
        - object_key
        - content_type
        - size
        - last_modified_at
      properties:
        tenant_id:
          type: string
          format: uuid
        file_id:
          type: string
          nullable: true
        object_key:
          type: string
        content_type:
          type: string
        size:
          type: integer
          format: int64
        etag:
          type: string
          nullable: true
        last_modified_at:
          type: string
          format: date-time

    ErrorResponse:
      type: object
      required:
        - error
        - message
        - request_id
      properties:
        error:
          type: string
        message:
          type: string
        request_id:
          type: string
          format: uuid

    HealthResponse:
      type: object
      required: [status]
      properties:
        status:
          type: string
          example: ok