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import base64
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import hashlib
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import hmac
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import logging
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import os
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import time
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from typing import Optional
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from flask import current_app
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from extensions.ext_storage import storage
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IMAGE_EXTENSIONS = ['jpg', 'jpeg', 'png', 'webp', 'gif', 'svg']
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IMAGE_EXTENSIONS.extend([ext.upper() for ext in IMAGE_EXTENSIONS])
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class UploadFileParser:
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@classmethod
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def get_image_data(cls, upload_file, force_url: bool = False) -> Optional[str]:
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if not upload_file:
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return None
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if upload_file.extension not in IMAGE_EXTENSIONS:
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return None
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if current_app.config['MULTIMODAL_SEND_IMAGE_FORMAT'] == 'url' or force_url:
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return cls.get_signed_temp_image_url(upload_file.id)
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else:
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try:
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data = storage.load(upload_file.key)
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except FileNotFoundError:
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logging.error(f'File not found: {upload_file.key}')
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return None
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encoded_string = base64.b64encode(data).decode('utf-8')
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return f'data:{upload_file.mime_type};base64,{encoded_string}'
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@classmethod
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def get_signed_temp_image_url(cls, upload_file_id) -> str:
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"""
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get signed url from upload file
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:param upload_file: UploadFile object
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:return:
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"""
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base_url = current_app.config.get('FILES_URL')
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image_preview_url = f'{base_url}/files/{upload_file_id}/image-preview'
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timestamp = str(int(time.time()))
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nonce = os.urandom(16).hex()
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data_to_sign = f"image-preview|{upload_file_id}|{timestamp}|{nonce}"
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secret_key = current_app.config['SECRET_KEY'].encode()
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sign = hmac.new(secret_key, data_to_sign.encode(), hashlib.sha256).digest()
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encoded_sign = base64.urlsafe_b64encode(sign).decode()
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return f"{image_preview_url}?timestamp={timestamp}&nonce={nonce}&sign={encoded_sign}"
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@classmethod
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def verify_image_file_signature(cls, upload_file_id: str, timestamp: str, nonce: str, sign: str) -> bool:
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"""
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verify signature
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:param upload_file_id: file id
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:param timestamp: timestamp
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:param nonce: nonce
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:param sign: signature
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:return:
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"""
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data_to_sign = f"image-preview|{upload_file_id}|{timestamp}|{nonce}"
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secret_key = current_app.config['SECRET_KEY'].encode()
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recalculated_sign = hmac.new(secret_key, data_to_sign.encode(), hashlib.sha256).digest()
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recalculated_encoded_sign = base64.urlsafe_b64encode(recalculated_sign).decode()
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if sign != recalculated_encoded_sign:
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return False
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current_time = int(time.time())
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return current_time - int(timestamp) <= 300
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