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82 lines
2.5 KiB
Python
82 lines
2.5 KiB
Python
# Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""MCP ImageContent formatting helpers for tool output."""
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from __future__ import annotations
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import base64
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from typing import Optional, Tuple
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import httpx
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from ..utils import (
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decode_base64_payload,
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extract_base64_payload,
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infer_file_type_from_bytes,
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is_url,
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)
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def _mime_type_from_image_bytes(data: bytes) -> str:
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if infer_file_type_from_bytes(data) != "image":
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return "image/jpeg"
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import puremagic
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mime = puremagic.from_string(data, mime=True)
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if mime.startswith("image/"):
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return mime
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return "image/jpeg"
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def normalize_mcp_image_payload(raw: str) -> Optional[Tuple[str, str]]:
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"""Convert provider image payloads to MCP ImageContent (base64 + mimeType)."""
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value = raw.strip()
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if not value:
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return None
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if is_url(value):
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try:
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with httpx.Client(timeout=30.0) as client:
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response = client.get(value)
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response.raise_for_status()
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data = response.content
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return (
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base64.b64encode(data).decode("ascii"),
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_mime_type_from_image_bytes(data),
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)
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except Exception:
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return None
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if value.startswith("data:"):
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try:
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data = decode_base64_payload(extract_base64_payload(value))
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mime = "image/jpeg"
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header = value[5:].split(",", 1)[0]
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if ";" in header:
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declared = header.split(";", 1)[0]
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if declared.startswith("image/"):
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mime = declared
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if mime == "image/jpeg":
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mime = _mime_type_from_image_bytes(data)
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return base64.b64encode(data).decode("ascii"), mime
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except ValueError:
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return None
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try:
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data = decode_base64_payload(value)
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return value, _mime_type_from_image_bytes(data)
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except ValueError:
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return None
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