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#!/usr/bin/env python3
import sys
import json
import base64
from typing import Optional, List
import requests
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.util.retry import Retry # pylint: disable=import-error
def requests_retry_session(
retries: int = 10,
backoff_factor: int = 3,
status_forcelist: List[int] = [500, 502, 504],
session: requests.Session = None,
) -> requests.Session:
"""
From: https://www.peterbe.com/plog/best-practice-with-retries-with-requests
"""
session = session or requests.Session()
retry = Retry(
total=retries,
read=retries,
connect=retries,
backoff_factor=backoff_factor,
status_forcelist=status_forcelist,
)
adapter = HTTPAdapter(max_retries=retry)
session.mount("http://", adapter)
session.mount("https://", adapter)
return session
def b32_hex(s: str) -> str:
"""
Converts a base32-encoded SHA-1 checksum into hex-encoded
base32 checksums are used by, eg, heritrix and in wayback CDX files
"""
s = s.strip().split()[0].lower()
if s.startswith("sha1:"):
s = s[5:]
if len(s) != 32:
if len(s) == 40:
return s
raise ValueError("not a base-32 encoded SHA-1 hash: {}".format(s))
return base64.b16encode(base64.b32decode(s.upper())).lower().decode("utf-8")
SANDCRAWLER_POSTGREST_URL = "http://wbgrp-svc506.us.archive.org:3030"
def get_db_cdx(url: str, http_session) -> List[dict]:
resp = http_session.get(SANDCRAWLER_POSTGREST_URL + "/cdx", params=dict(url="eq." + url))
resp.raise_for_status()
rows = resp.json()
return rows or []
CDX_API_URL = "https://web.archive.org/cdx/search/cdx"
def get_api_cdx(url: str, partial_dt: str, http_session) -> Optional[dict]:
params = {
"url": url,
"from": partial_dt,
"to": partial_dt,
"matchType": "exact",
"output": "json",
"limit": 20,
# can't filter status because might be warc/revisit
#"filter": "statuscode:200",
}
resp = http_session.get(CDX_API_URL, params=params)
resp.raise_for_status()
rows = resp.json()
if not rows:
return None
#print(rows, file=sys.stderr)
if len(rows) < 2:
return None
for raw in rows[1:]:
record = dict(
surt=raw[0],
datetime=raw[1],
url=raw[2],
mimetype=raw[3],
status_code=raw[4],
sha1b32=raw[5],
sha1hex=b32_hex(raw[5]),
)
if record['url'] != url:
# TODO: could allow HTTP/HTTPS fuzzy match
print("CDX API near match: URL", file=sys.stderr)
continue
if not record['datetime'].startswith(partial_dt):
print(f"CDX API near match: datetime {partial_dt} {record['datetime']}", file=sys.stderr)
continue
if record['status_code'] == "200" or (record['status_code'] == '-' and record['mimetype'] == 'warc/revisit'):
return record
else:
print(f"CDX API near match: status {record['status_code']}", file=sys.stderr)
return None
def process_file(fe, session) -> dict:
short_urls = []
self_urls = dict()
full_urls = dict()
status = "unknown"
for pair in fe['urls']:
u = pair['url']
if not '://web.archive.org/web/' in u:
continue
seg = u.split('/')
assert seg[2] == "web.archive.org"
assert seg[3] == "web"
assert seg[4].isdigit()
original_url = "/".join(seg[5:])
if len(seg[4]) == 12 or len(seg[4]) == 4:
short_urls.append(u)
elif len(seg[4]) == 14:
self_urls[original_url] = u
else:
print(f"other bogus ts: {seg[4]}", file=sys.stderr)
return dict(file_entity=fe, full_urls=full_urls, status="fail-bogus-ts")
if len(short_urls) == 0:
return dict(file_entity=fe, full_urls=[], status="skip-no-shorts")
for short in list(set(short_urls)):
seg = short.split('/')
ts = seg[4]
assert len(ts) in [12,4] and ts.isdigit()
original_url = '/'.join(seg[5:])
if short in full_urls:
continue
if original_url in self_urls and ts in self_urls[original_url]:
full_urls[short] = self_urls[original_url]
status = "success-self"
continue
cdx_row_list = get_db_cdx(original_url, http_session=session)
for cdx_row in cdx_row_list:
if cdx_row['sha1hex'] == fe['sha1'] and cdx_row['url'] == original_url and cdx_row['datetime'].startswith(ts):
assert len(cdx_row['datetime']) == 14 and cdx_row['datetime'].isdigit()
full_urls[short] = f"https://web.archive.org/web/{cdx_row['datetime']}/{original_url}"
status = "success-db"
break
else:
#print(f"cdx DB found, but no match", file=sys.stderr)
pass
cdx_row = None
if short in full_urls:
continue
cdx_record = None
try:
cdx_record = get_api_cdx(original_url, partial_dt=ts, http_session=session)
except requests.exceptions.HTTPError as e:
if e.response.status_code == 403:
return dict(file_entity=fe, full_urls=full_urls, status="fail-cdx-403")
else:
raise
if cdx_record:
if cdx_record['sha1hex'] == fe['sha1'] and cdx_record['url'] == original_url and cdx_record['datetime'].startswith(ts):
assert len(cdx_record['datetime']) == 14 and cdx_record['datetime'].isdigit()
full_urls[short] = f"https://web.archive.org/web/{cdx_record['datetime']}/{original_url}"
status = "success-api"
break
else:
print(f"cdx API found, but no match", file=sys.stderr)
else:
print(f"no CDX API record found: {original_url}", file=sys.stderr)
if short not in full_urls:
return dict(file_entity=fe, full_urls=full_urls, status="fail-not-found")
return dict(
file_entity=fe,
full_urls=full_urls,
status=status,
)
def main():
session = requests_retry_session()
session.headers.update({
"User-Agent": "Mozilla/5.0 fatcat.CdxFixupBot",
})
for line in sys.stdin:
if not line.strip():
continue
fe = json.loads(line)
print(json.dumps(process_file(fe, session=session)))
if __name__=="__main__":
main()
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