openapi: 3.0.3
info:
  title: Stella Ops Artifact Store API
  description: |
    Unified artifact storage API with bom-ref support.
    
    Sprint: SPRINT_20260118_017_Evidence_artifact_store_unification (AS-005, AS-007)
    
    ## Overview
    
    The Artifact Store API provides unified storage and retrieval of evidence artifacts
    (SBOMs, VEX, DSSE envelopes, Rekor proofs) using a bom-ref based path convention.
    
    ## Path Convention
    
    Artifacts are stored at: `/artifacts/{bom-ref-encoded}/{serialNumber}/{artifactId}.json`
    
    Where:
    - `bom-ref-encoded`: URL-safe base64 encoded PURL
    - `serialNumber`: CycloneDX serial number (URN UUID)
    - `artifactId`: Unique artifact identifier
    
  version: 1.0.0
  contact:
    name: Stella Ops Team
  license:
    name: BUSL-1.1

servers:
  - url: /api/v1
    description: API v1

tags:
  - name: Artifacts
    description: Artifact storage and retrieval operations
  - name: Evidence
    description: Evidence submission operations

paths:
  /evidence:
    post:
      operationId: submitEvidence
      tags: [Evidence]
      summary: Submit evidence artifact
      description: |
        Ingests DSSE envelopes with SBOM references and stores in unified ArtifactStore.
        Extracts and validates bom_ref and cyclonedx_serial from the envelope.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EvidenceSubmissionRequest'
      responses:
        '201':
          description: Evidence stored successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ArtifactMetadata'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: Artifact already exists
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ArtifactMetadata'

  /artifacts:
    get:
      operationId: listArtifacts
      tags: [Artifacts]
      summary: List artifacts by bom-ref
      description: |
        Returns paginated list of artifacts for a given bom-ref.
        Supports filtering by serial_number and time range.
      parameters:
        - name: bom_ref
          in: query
          required: true
          description: Package URL or component reference
          schema:
            type: string
          example: "pkg:docker/acme/api@sha256:abc123"
        - name: serial_number
          in: query
          required: false
          description: CycloneDX serial number filter
          schema:
            type: string
          example: "urn:uuid:12345678-1234-1234-1234-123456789012"
        - name: from
          in: query
          required: false
          description: Start date filter (ISO 8601)
          schema:
            type: string
            format: date-time
        - name: to
          in: query
          required: false
          description: End date filter (ISO 8601)
          schema:
            type: string
            format: date-time
        - name: limit
          in: query
          required: false
          description: Maximum results per page (default 50, max 1000)
          schema:
            type: integer
            minimum: 1
            maximum: 1000
            default: 50
        - name: continuation_token
          in: query
          required: false
          description: Token for pagination
          schema:
            type: string
      responses:
        '200':
          description: Artifacts retrieved successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ArtifactListResponse'

  /artifacts/{artifact_id}:
    get:
      operationId: getArtifact
      tags: [Artifacts]
      summary: Get artifact by ID
      description: Returns artifact metadata and optionally content
      parameters:
        - name: artifact_id
          in: path
          required: true
          schema:
            type: string
            format: uuid
        - name: include_content
          in: query
          required: false
          description: Include artifact content in response
          schema:
            type: boolean
            default: false
      responses:
        '200':
          description: Artifact retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ArtifactResponse'
        '404':
          description: Artifact not found

    delete:
      operationId: deleteArtifact
      tags: [Artifacts]
      summary: Delete artifact (soft delete)
      description: Marks artifact as deleted without removing from storage
      parameters:
        - name: artifact_id
          in: path
          required: true
          schema:
            type: string
            format: uuid
      responses:
        '204':
          description: Artifact deleted
        '404':
          description: Artifact not found

  /artifacts/{artifact_id}/content:
    get:
      operationId: getArtifactContent
      tags: [Artifacts]
      summary: Get artifact content
      description: Returns the raw artifact content
      parameters:
        - name: artifact_id
          in: path
          required: true
          schema:
            type: string
            format: uuid
      responses:
        '200':
          description: Artifact content
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
            application/json:
              schema:
                type: object
            application/vnd.dsse+json:
              schema:
                type: object
            application/vnd.cyclonedx+json:
              schema:
                type: object
        '404':
          description: Artifact not found

components:
  schemas:
    EvidenceSubmissionRequest:
      type: object
      required:
        - bom_ref
      properties:
        bom_ref:
          type: string
          description: Package URL or component reference
          example: "pkg:docker/acme/api@sha256:abc123def456"
        cyclonedx_serial:
          type: string
          description: CycloneDX serial number (URN UUID)
          example: "urn:uuid:12345678-1234-1234-1234-123456789012"
        dsse_uri:
          type: string
          description: URI to DSSE envelope (s3://, file://, https://)
          example: "s3://evidence-bucket/path/to/envelope.json"
        rekor_uuid:
          type: string
          description: Rekor log entry UUID
          example: "f1a2b3c4d5e6f7a8"
        content:
          type: string
          format: byte
          description: Base64-encoded artifact content (alternative to dsse_uri)
        content_type:
          type: string
          description: MIME type of content
          example: "application/vnd.dsse+json"
        metadata:
          type: object
          additionalProperties:
            type: string
          description: Additional metadata key-value pairs

    ArtifactMetadata:
      type: object
      required:
        - artifact_id
        - bom_ref
        - storage_key
        - sha256
        - created_at
      properties:
        artifact_id:
          type: string
          format: uuid
          description: Unique artifact identifier
        bom_ref:
          type: string
          description: Package URL or component reference
        serial_number:
          type: string
          nullable: true
          description: CycloneDX serial number
        storage_key:
          type: string
          description: Storage path for artifact
        content_type:
          type: string
          description: MIME type
        size_bytes:
          type: integer
          format: int64
          description: Content size in bytes
        sha256:
          type: string
          description: SHA-256 hash of content
        created_at:
          type: string
          format: date-time
          description: Creation timestamp
        rekor_uuid:
          type: string
          nullable: true
          description: Rekor log entry UUID if linked
        metadata:
          type: object
          additionalProperties:
            type: string
          description: Additional metadata

    ArtifactListResponse:
      type: object
      required:
        - artifacts
        - total
      properties:
        artifacts:
          type: array
          items:
            $ref: '#/components/schemas/ArtifactMetadata'
        total:
          type: integer
          description: Total matching artifacts
        continuation_token:
          type: string
          nullable: true
          description: Token for next page

    ArtifactResponse:
      allOf:
        - $ref: '#/components/schemas/ArtifactMetadata'
        - type: object
          properties:
            content:
              type: string
              format: byte
              nullable: true
              description: Base64-encoded content (if include_content=true)

    ErrorResponse:
      type: object
      required:
        - error
        - message
      properties:
        error:
          type: string
          description: Error code
        message:
          type: string
          description: Human-readable error message
        details:
          type: object
          additionalProperties: true
          description: Additional error details