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65 lines
2.0 KiB
Python
65 lines
2.0 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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"""Encoding helpers shared by input contract and inference adapters."""
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from __future__ import annotations
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import base64
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import re
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from typing import Optional
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from urllib.parse import urlparse
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def is_url(value: str) -> bool:
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if not (value.startswith("http://") or value.startswith("https://")):
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return False
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result = urlparse(value)
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return all([result.scheme, result.netloc]) and result.scheme in ("http", "https")
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def is_base64(value: str) -> bool:
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pattern = r"^[A-Za-z0-9+/]+={0,2}$"
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return bool(re.fullmatch(pattern, value))
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def extract_base64_payload(input_data: str) -> str:
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if input_data.startswith("data:"):
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if "," not in input_data:
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raise ValueError("Invalid data URL: expected a comma after the MIME type.")
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return input_data.split(",", 1)[1]
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return input_data
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def decode_base64_payload(payload: str) -> bytes:
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try:
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return base64.b64decode(payload, validate=True)
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except Exception as e:
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raise ValueError(
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f"Invalid Base64 input: {e}. "
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"Ensure the string is complete and correctly padded."
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) from e
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def infer_file_type_from_bytes(data: bytes) -> Optional[str]:
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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 "image"
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if mime == "application/pdf":
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return "pdf"
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return None
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