467 lines
17 KiB
Python
467 lines
17 KiB
Python
import asyncio
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import hashlib
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import mimetypes
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import os
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import re
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import shutil
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import tempfile
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import zipfile
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from pathlib import Path
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from urllib.parse import parse_qsl, unquote, urlparse
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import aiohttp
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import structlog
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from multidict import CIMultiDictProxy
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from yarl import URL
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from skyvern.config import settings
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from skyvern.constants import BROWSER_DOWNLOAD_TIMEOUT, BROWSER_DOWNLOADING_SUFFIX, REPO_ROOT_DIR
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from skyvern.exceptions import DownloadFileMaxSizeExceeded, DownloadFileMaxWaitingTime
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from skyvern.forge import app
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from skyvern.forge.sdk.api.aws import AsyncAWSClient
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from skyvern.utils.url_validators import encode_url
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LOG = structlog.get_logger()
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async def download_from_s3(client: AsyncAWSClient, s3_uri: str) -> str:
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downloaded_bytes = await client.download_file(uri=s3_uri)
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filename = s3_uri.split("/")[-1] # Extract filename from the end of S3 URI
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file_path = create_named_temporary_file(delete=False, file_name=filename)
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LOG.info(f"Downloaded file to {file_path.name}")
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file_path.write(downloaded_bytes)
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return file_path.name
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def get_file_name_and_suffix_from_headers(headers: CIMultiDictProxy[str] | dict[str, str]) -> tuple[str, str]:
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file_stem = ""
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file_suffix: str | None = ""
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# retrieve the stem and suffix from Content-Disposition
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content_disposition = headers.get("Content-Disposition")
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if content_disposition:
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filename = re.findall('filename="(.+)"', content_disposition, re.IGNORECASE)
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if len(filename) > 0:
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file_stem = Path(filename[0]).stem
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file_suffix = Path(filename[0]).suffix
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if file_suffix:
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return file_stem, file_suffix
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# retrieve the suffix from Content-Type
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content_type = headers.get("Content-Type")
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if content_type:
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if file_suffix := mimetypes.guess_extension(content_type):
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return file_stem, file_suffix
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return file_stem, file_suffix or ""
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def extract_google_drive_file_id(url: str) -> str | None:
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"""Extract file ID from Google Drive URL."""
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# Handle format: https://drive.google.com/file/d/{file_id}/view
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match = re.search(r"/file/d/([a-zA-Z0-9_-]+)", url)
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if match:
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return match.group(1)
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return None
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def is_valid_mime_type(file_path: str) -> bool:
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mime_type, _ = mimetypes.guess_type(file_path)
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return mime_type is not None
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def _determine_download_filename(
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filename: str | None,
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response_headers: dict,
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url: str,
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) -> str:
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"""Determine the filename for a downloaded file."""
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if filename:
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file_name = filename
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if not os.path.splitext(file_name)[1]:
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content_type = response_headers.get("Content-Type", "")
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if content_type:
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ext = mimetypes.guess_extension(content_type.split(";")[0].strip())
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if ext:
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file_name = file_name + ext
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return sanitize_filename(file_name)
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file_name = ""
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file_suffix = ""
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try:
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file_name, file_suffix = get_file_name_and_suffix_from_headers(response_headers)
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if not file_suffix:
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LOG.warning("No extension name retrieved from HTTP headers")
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except Exception:
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LOG.exception("Failed to retrieve the file extension from HTTP headers")
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query_params = dict(parse_qsl(urlparse(url).query))
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if "download" in query_params:
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file_name = query_params["download"]
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if not file_name:
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LOG.info("No file name retrieved from HTTP headers, using the file name from the URL")
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file_name = os.path.basename(urlparse(url).path) or "download"
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if not is_valid_mime_type(file_name) and file_suffix:
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LOG.info("No file extension detected, adding the extension from HTTP headers")
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file_name = file_name + file_suffix
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return sanitize_filename(file_name)
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def validate_download_url(url: str) -> bool:
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"""Validate if a URL is supported for downloading.
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Security validation for URL downloads to prevent:
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- File system access outside allowed directories
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- Access to local file system in non-local environments
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- Unsupported or dangerous URL schemes
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Args:
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url: The URL to validate
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Returns:
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True if valid, False otherwise.
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"""
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try:
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parsed_url = urlparse(url)
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scheme = parsed_url.scheme.lower()
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# Allow http/https URLs (includes Google Drive which uses https)
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if scheme in ("http", "https"):
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return True
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# Allow S3 URIs for Skyvern uploads bucket
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if scheme == "s3":
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if url.startswith(f"s3://{settings.AWS_S3_BUCKET_UPLOADS}/{settings.ENV}/o_"):
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return True
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return False
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# Allow Azure URIs for Skyvern uploads container
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if scheme == "azure":
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if url.startswith(f"azure://{settings.AZURE_STORAGE_CONTAINER_UPLOADS}/{settings.ENV}/o_"):
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return True
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return False
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# Allow file:// URLs only in local environment
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if scheme == "file":
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if settings.ENV != "local":
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return False
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# Validate the file path is within allowed directories
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try:
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file_path = parse_uri_to_path(url)
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allowed_prefix = f"{REPO_ROOT_DIR}/downloads"
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if not file_path.startswith(allowed_prefix):
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return False
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return True
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except ValueError:
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return False
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# Reject unsupported schemes
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return False
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except Exception:
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return False
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async def download_file(
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url: str,
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max_size_mb: int | None = None,
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headers: dict[str, str] | None = None,
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output_dir: str | None = None,
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filename: str | None = None,
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) -> str:
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try:
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# Check if URL is a Google Drive link
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if "drive.google.com" in url:
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file_id = extract_google_drive_file_id(url)
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if file_id:
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# Convert to direct download URL
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url = f"https://drive.google.com/uc?export=download&id={file_id}"
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LOG.info("Converting Google Drive link to direct download", url=url)
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# Check if URL is a cloud storage URI (S3 or Azure)
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parsed = urlparse(url)
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if parsed.scheme == "s3":
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uploads_prefix = f"s3://{settings.AWS_S3_BUCKET_UPLOADS}/{settings.ENV}/o_"
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if url.startswith(uploads_prefix):
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LOG.info("Downloading Skyvern file from S3", url=url)
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data = await app.STORAGE.download_uploaded_file(url)
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if data is None:
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raise Exception(f"Failed to download file from S3: {url}")
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filename = url.split("/")[-1]
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temp_file = create_named_temporary_file(delete=False, file_name=filename)
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LOG.info(f"Downloaded file to {temp_file.name}")
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temp_file.write(data)
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return temp_file.name
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elif parsed.scheme == "azure":
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uploads_prefix = f"azure://{settings.AZURE_STORAGE_CONTAINER_UPLOADS}/{settings.ENV}/o_"
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if url.startswith(uploads_prefix):
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LOG.info("Downloading Skyvern file from Azure Blob Storage", url=url)
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data = await app.STORAGE.download_uploaded_file(url)
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if data is None:
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raise Exception(f"Failed to download file from Azure Blob Storage: {url}")
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filename = url.split("/")[-1]
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temp_file = create_named_temporary_file(delete=False, file_name=filename)
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LOG.info(f"Downloaded file to {temp_file.name}")
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temp_file.write(data)
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return temp_file.name
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# Check if URL is a file:// URI
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# we only support to download local files when the environment is local
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# and the file is in the skyvern downloads directory
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if url.startswith("file://") and settings.ENV == "local":
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local_path = parse_uri_to_path(url)
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if local_path.startswith(f"{REPO_ROOT_DIR}/downloads"):
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LOG.info("Downloading file from local file system", url=url)
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return local_path
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async with aiohttp.ClientSession(raise_for_status=True) as session:
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LOG.info("Starting to download file", url=url)
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encoded_url = encode_url(url)
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async with session.get(URL(encoded_url, encoded=True), headers=headers) as response:
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# Check the content length if available
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if max_size_mb and response.content_length and response.content_length > max_size_mb * 1024 * 1024:
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# todo: move to root exception.py
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raise DownloadFileMaxSizeExceeded(max_size_mb)
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# Get the file name
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if output_dir:
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os.makedirs(output_dir, exist_ok=True)
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download_dir = output_dir
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else:
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download_dir = make_temp_directory(prefix="skyvern_downloads_")
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# Determine filename - use provided filename or derive from response/URL
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file_name = _determine_download_filename(filename, dict(response.headers), url)
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file_path = os.path.join(download_dir, file_name)
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LOG.info(f"Downloading file to {file_path}")
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with open(file_path, "wb") as f:
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# Write the content of the request into the file
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total_bytes_downloaded = 0
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async for chunk in response.content.iter_chunked(1024):
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f.write(chunk)
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total_bytes_downloaded += len(chunk)
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if max_size_mb and total_bytes_downloaded > max_size_mb * 1024 * 1024:
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raise DownloadFileMaxSizeExceeded(max_size_mb)
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LOG.info(f"File downloaded successfully to {file_path}")
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return file_path
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except aiohttp.ClientResponseError as e:
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LOG.exception(f"Failed to download file, status code: {e.status}")
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raise
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except DownloadFileMaxSizeExceeded as e:
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LOG.exception(f"Failed to download file, max size exceeded: {e.max_size}")
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raise
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except Exception:
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LOG.exception("Failed to download file")
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raise
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def zip_files(files_path: str, zip_file_path: str) -> str:
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with zipfile.ZipFile(zip_file_path, "w", zipfile.ZIP_DEFLATED) as zipf:
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for root, dirs, files in os.walk(files_path):
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for file in files:
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file_path = os.path.join(root, file)
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arcname = os.path.relpath(file_path, files_path) # Relative path within the zip
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zipf.write(file_path, arcname)
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return zip_file_path
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def unzip_files(zip_file_path: str, output_dir: str) -> None:
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with zipfile.ZipFile(zip_file_path, "r") as zip_ref:
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zip_ref.extractall(output_dir)
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def get_path_for_workflow_download_directory(run_id: str | None) -> Path:
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return Path(get_download_dir(run_id=run_id))
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def get_download_dir(run_id: str | None) -> str:
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download_dir = os.path.join(settings.DOWNLOAD_PATH, str(run_id))
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os.makedirs(download_dir, exist_ok=True)
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return download_dir
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def list_files_in_directory(directory: Path, recursive: bool = False) -> list[str]:
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listed_files: list[str] = []
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for root, dirs, files in os.walk(directory):
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listed_files.extend([os.path.join(root, file) for file in files])
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if not recursive:
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break
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return listed_files
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def list_downloading_files_in_directory(
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directory: Path, downloading_suffix: str = BROWSER_DOWNLOADING_SUFFIX
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) -> list[str]:
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# check if there's any file is still downloading
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downloading_files: list[str] = []
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for file in list_files_in_directory(directory):
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path = Path(file)
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if path.suffix == downloading_suffix:
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downloading_files.append(file)
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return downloading_files
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async def wait_for_download_finished(downloading_files: list[str], timeout: float = BROWSER_DOWNLOAD_TIMEOUT) -> None:
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cur_downloading_files = downloading_files
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try:
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async with asyncio.timeout(timeout):
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while len(cur_downloading_files) > 0:
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new_downloading_files: list[str] = []
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for path in cur_downloading_files:
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# Check for cloud storage URIs (S3 or Azure)
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parsed = urlparse(path)
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if parsed.scheme in ("s3", "azure"):
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if not await app.STORAGE.file_exists(path):
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LOG.debug(
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"downloading file is not found in cloud storage, means the file finished downloading",
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path=path,
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)
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continue
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else:
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if not Path(path).exists():
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LOG.debug(
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"downloading file is not found in the local file system, means the file finished downloading",
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path=path,
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)
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continue
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new_downloading_files.append(path)
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cur_downloading_files = new_downloading_files
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await asyncio.sleep(1)
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except asyncio.TimeoutError:
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raise DownloadFileMaxWaitingTime(downloading_files=cur_downloading_files)
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async def check_downloading_files_and_wait_for_download_to_complete(
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download_dir: Path,
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organization_id: str,
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browser_session_id: str | None = None,
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timeout: float = BROWSER_DOWNLOAD_TIMEOUT,
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) -> None:
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# check if there's any file is still downloading
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downloading_files = list_downloading_files_in_directory(download_dir)
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if browser_session_id:
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files_in_browser_session = await app.STORAGE.list_downloading_files_in_browser_session(
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organization_id=organization_id, browser_session_id=browser_session_id
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)
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downloading_files = downloading_files + files_in_browser_session
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if len(downloading_files) == 0:
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return
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LOG.info(
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"File downloading hasn't completed, wait for a while",
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downloading_files=downloading_files,
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)
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try:
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await wait_for_download_finished(
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downloading_files=downloading_files,
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timeout=timeout,
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)
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except DownloadFileMaxWaitingTime as e:
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LOG.warning(
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"There're several long-time downloading files, these files might be broken",
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downloading_files=e.downloading_files,
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)
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def get_number_of_files_in_directory(directory: Path, recursive: bool = False) -> int:
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return len(list_files_in_directory(directory, recursive))
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def sanitize_filename(filename: str) -> str:
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return "".join(c for c in filename if c.isalnum() or c in ["-", "_", ".", "%", " "])
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def rename_file(file_path: str, new_file_name: str) -> str:
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try:
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new_file_name = sanitize_filename(new_file_name)
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new_file_path = os.path.join(os.path.dirname(file_path), new_file_name)
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os.rename(file_path, new_file_path)
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return new_file_path
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except Exception:
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LOG.exception(f"Failed to rename file {file_path} to {new_file_name}")
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return file_path
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def calculate_sha256_for_file(file_path: str) -> str:
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"""Helper function to calculate SHA256 hash of a file."""
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sha256_hash = hashlib.sha256()
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with open(file_path, "rb") as f:
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for byte_block in iter(lambda: f.read(4096), b""):
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sha256_hash.update(byte_block)
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return sha256_hash.hexdigest()
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def create_folder_if_not_exist(dir: str) -> None:
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path = Path(dir)
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path.mkdir(parents=True, exist_ok=True)
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def get_skyvern_temp_dir() -> str:
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temp_dir = settings.TEMP_PATH
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create_folder_if_not_exist(temp_dir)
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return temp_dir
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def make_temp_directory(
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suffix: str | None = None,
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prefix: str | None = None,
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) -> str:
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temp_dir = settings.TEMP_PATH
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create_folder_if_not_exist(temp_dir)
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return tempfile.mkdtemp(suffix=suffix, prefix=prefix, dir=temp_dir)
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def create_named_temporary_file(delete: bool = True, file_name: str | None = None) -> tempfile._TemporaryFileWrapper:
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temp_dir = settings.TEMP_PATH
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create_folder_if_not_exist(temp_dir)
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if file_name:
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# Sanitize the filename to remove any dangerous characters
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safe_file_name = sanitize_filename(file_name)
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# Create file with exact name (without random characters)
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file_path = os.path.join(temp_dir, safe_file_name)
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# Open in binary mode and return a NamedTemporaryFile-like object
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file = open(file_path, "wb")
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return tempfile._TemporaryFileWrapper(file, file_path, delete=delete)
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return tempfile.NamedTemporaryFile(dir=temp_dir, delete=delete)
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def clean_up_dir(dir: str) -> None:
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if not os.path.exists(dir):
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return
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if os.path.isfile(dir):
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os.unlink(dir)
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return
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for item in os.listdir(dir):
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item_path = os.path.join(dir, item)
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if os.path.isfile(item_path) or os.path.islink(item_path):
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os.unlink(item_path)
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elif os.path.isdir(item_path):
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shutil.rmtree(item_path)
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return
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def clean_up_skyvern_temp_dir() -> None:
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return clean_up_dir(get_skyvern_temp_dir())
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def parse_uri_to_path(uri: str) -> str:
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parsed_uri = urlparse(uri)
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if parsed_uri.scheme != "file":
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raise ValueError(f"Invalid URI scheme: {parsed_uri.scheme} expected: file")
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path = parsed_uri.netloc + parsed_uri.path
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return unquote(path)
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