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85 lines
3.1 KiB
Python
85 lines
3.1 KiB
Python
#!/usr/bin/env python3
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"""Fetch the pinned, licensed PDF test fixtures outside the checkout."""
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import argparse
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import hashlib
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import json
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import os
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from pathlib import Path
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import tempfile
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import time
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import urllib.error
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import urllib.parse
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import urllib.request
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class _HttpsOnlyRedirectHandler(urllib.request.HTTPRedirectHandler):
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def redirect_request(self, req, fp, code, msg, headers, newurl):
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if urllib.parse.urlsplit(newurl).scheme != "https":
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raise ValueError("refusing to follow a non-HTTPS redirect")
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return super().redirect_request(req, fp, code, msg, headers, newurl)
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urllib.request.install_opener(urllib.request.build_opener(_HttpsOnlyRedirectHandler))
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def fetch(url):
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if urllib.parse.urlsplit(url).scheme != "https":
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raise ValueError("refusing to fetch a non-HTTPS URL")
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for attempt in range(3):
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try:
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with urllib.request.urlopen(url, timeout=60) as response:
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return response.read(16 * 1024 * 1024 + 1)
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except urllib.error.HTTPError as error:
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if error.code not in (408, 429) and not 500 <= error.code <= 599:
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raise
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if attempt == 2:
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raise
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error.close()
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except (urllib.error.URLError, TimeoutError, ConnectionError):
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if attempt == 2:
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raise
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time.sleep(attempt + 1)
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raise RuntimeError("fixture download retries exhausted")
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def main():
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument("destination", type=Path)
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args = parser.parse_args()
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root = Path(__file__).resolve().parent.parent
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destination = args.destination.resolve()
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if destination == root or root in destination.parents:
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parser.error("fixtures must be stored outside the checkout")
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fixtures = json.loads((root / "crates/pdf/tests/fonts.json").read_text())
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destination.mkdir(parents=True, exist_ok=True)
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for fixture in fixtures:
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name, url, digest = fixture["name"], fixture["source"], fixture["sha256"]
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if Path(name).name != name or name in ("", ".", "..") or not url.startswith("https://"):
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raise ValueError("invalid fixture name or source")
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path = (destination / name).resolve()
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if path.parent != destination:
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raise ValueError(f"fixture path escapes destination: {name}")
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if path.is_file() and hashlib.sha256(path.read_bytes()).hexdigest() == digest:
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print(f"Verified {name}")
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continue
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data = fetch(url)
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if len(data) > 16 * 1024 * 1024 or hashlib.sha256(data).hexdigest() != digest:
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raise ValueError(f"fixture size or SHA-256 mismatch: {name}")
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fd, tmp = tempfile.mkstemp(dir=destination, prefix=f".{name}.", suffix=".tmp")
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try:
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with os.fdopen(fd, "wb") as handle:
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handle.write(data)
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os.replace(tmp, destination / name)
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except BaseException:
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try:
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os.unlink(tmp)
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except OSError:
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pass
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raise
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print(f"Fetched and verified {name}")
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if __name__ == "__main__":
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main()
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