media_artifacts.py DOX

Purpose

• Own the media_artifacts.py helper module.
• This module validates, decodes, names, and normalizes media artifact payloads.
• Keep this file-level DOX profile synchronized with media_artifacts.py because this directory is intentionally flat.

Ownership

• media_artifacts.py owns the runtime implementation.
• media_artifacts.py.dox.md owns durable notes about responsibilities, contracts, side effects, and verification for that implementation.
• Classes:
• MediaArtifactError (ValueError)
• EmptyBase64Data (MediaArtifactError)
• InvalidBase64Data (MediaArtifactError)
• ArtifactTooLarge (MediaArtifactError)
• Base64Payload (no explicit base class)
• ImageDataUrl (no explicit base class)
• SavedArtifact (no explicit base class)
• Top-level functions:
• compact_base64(data: str) -> str
• estimated_base64_decoded_size(data: str) -> int
• decode_base64_payload(data: str, max_bytes: int | None=...) -> Base64Payload
• normalize_mime(mime_type: str, default: str=..., required_prefix: str=...) -> str
• guess_extension(mime_type: str, fallback: str=...) -> str
• filename_from_uri(uri: str) -> str
• safe_filename(value: str, default: str=..., default_extension: str=...) -> str
• image_data_url_from_base64(data: str, mime_type: str=..., max_bytes: int | None=...) -> ImageDataUrl
• save_base64_artifact(data: str, mime_type: str=..., directory_parts: tuple[str, ...], preferred_name: str=..., default_filename: str=..., max_bytes: int | None=...) -> SavedArtifact
• Notable constants/configuration names: DEFAULT_MAX_ARTIFACT_SIZE_BYTES.

Runtime Contracts

• Helper modules own reusable framework APIs and must preserve public callers unless all callers, tests, and docs are updated together.
• Update this file whenever public functions, classes, persistence behavior, path/security assumptions, side effects, or cross-module contracts change.
• Observed side-effect areas: filesystem reads, filesystem writes, network calls.
• Imported dependency areas include: __future__, base64, binascii, dataclasses, helpers, mimetypes, pathlib, urllib.parse, uuid.

Key Concepts

• Important called helpers/classes observed in the source: dataclass, join, compact_base64, Base64Payload, str.strip.lower, str.strip, urlparse, decode_base64_payload, normalize_mime, ImageDataUrl, guess_extension, safe_filename, Path, artifact_dir.mkdir, path.write_bytes, SavedArtifact, super.__init__, EmptyBase64Data, estimated_base64_decoded_size, base64.b64decode.
• Keep request/response, tool, or helper semantics documented here at the same time as source changes.

Work Guidance

• Preserve public helper APIs used by core code and plugins unless every caller is updated.
• Keep path, auth, secret, persistence, network, and subprocess behavior explicit and bounded.
• Prefer adding cohesive helper functions here only when behavior is reused across modules.

Verification

• Run targeted tests for changed helper behavior; run security regressions for auth, filesystem, WebSocket, tunnel, upload, or secret-handling helpers.
• Related tests observed by source search:
  • tests/test_mcp_handler_multimodal.py
  • tests/test_media_artifacts.py

Child DOX Index

No child DOX files.