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#!/usr/bin/env python3
"""
Helpers to create Web Capture entities from extracted wayback content.
Works as a stand-alone script (for debugging) or as library routines.
"""
import sys
import json
import base64
import hashlib
import requests
import datetime
import argparse
from bs4 import BeautifulSoup
from fatcat_client import *
CDX_API_BASE = "https://web.archive.org/cdx/search/cdx"
GWB_URL_BASE = "https://web.archive.org/web"
REQ_SESSION = requests.Session()
def b32_hex(s):
"""copy/pasta from elsewhere"""
s = s.strip().split()[0].lower()
if s.startswith("sha1:"):
s = s[5:]
if len(s) != 32:
return s
return base64.b16encode(base64.b32decode(s.upper())).lower().decode('utf-8')
def parse_wbm_url(url):
"""Takes a wayback machine URL, and returns a tuple:
(timestamp, datetime, original_url)
"""
chunks = url.split('/')
assert len(chunks) >= 6
assert chunks[2] == 'web.archive.org'
assert chunks[3] == 'web'
return (chunks[4],
parse_wbm_timestamp(chunks[4]),
'/'.join(chunks[5:]))
def test_parse_wbm_url():
u = "http://web.archive.org/web/20010712114837/http://www.dlib.org/dlib/june01/reich/06reich.html"
assert parse_wbm_url(u) == (
"20010712114837",
datetime.datetime(2001, 7, 12, 11, 48, 37),
"http://www.dlib.org/dlib/june01/reich/06reich.html")
def parse_wbm_timestamp(timestamp):
"""
Takes a complete WBM timestamp string (like "20020327115625") and returns a
python datetime object (UTC)
"""
# strip any "im_" or "id_" suffix
if timestamp.endswith('_'):
timestamp = timestamp[:-3]
# inflexible; require the full second-precision timestamp
assert len(timestamp) == 14
return datetime.datetime(
year=int(timestamp[0:4]),
month=int(timestamp[4:6]),
day=int(timestamp[6:8]),
hour=int(timestamp[8:10]),
minute=int(timestamp[10:12]),
second=int(timestamp[12:14]))
def test_parse_wbm_timestamp():
assert parse_wbm_timestamp("20010712114837") == \
datetime.datetime(2001, 7, 12, 11, 48, 37)
def fetch_wbm(url):
resp = REQ_SESSION.get(url)
resp.raise_for_status()
assert resp.content
return resp.content
def lookup_cdx(embed_url, verify_hashes=True, cdx_output=None):
assert embed_url.startswith('/web/')
embed_url = embed_url.split('/')
timestamp = embed_url[2]
if timestamp.endswith('_'):
timestamp = timestamp[:-3]
url = '/'.join(embed_url[3:])
#print((timestamp, url))
resp = REQ_SESSION.get(CDX_API_BASE, params=dict(
url=url,
closest=timestamp,
sort="closest",
resolveRevisits="true",
matchType="exact",
limit=1,
))
resp.raise_for_status()
#print(resp.url)
if resp.content:
hit = resp.content.decode('utf-8').split('\n')[0]
if cdx_output:
cdx_output.write(hit + "\n")
cdx = hit.split(' ')
cdx = [x if (x and x != '-') else None for x in cdx]
webcapture_cdx = WebcaptureEntityCdx(
surt=cdx[0],
timestamp=parse_wbm_timestamp(cdx[1]),
url=cdx[2],
mimetype=cdx[3],
status_code=(cdx[4] and int(cdx[4])) or None,
sha1=b32_hex(cdx[5]),
sha256=None,
)
if verify_hashes:
resp = REQ_SESSION.get(GWB_URL_BASE + "/{}id_/{}".format(
cdx[1], # raw timestamp
webcapture_cdx.url))
resp.raise_for_status()
assert webcapture_cdx.sha1 == hashlib.sha1(resp.content).digest().hex()
webcapture_cdx.sha256 = hashlib.sha256(resp.content).digest().hex()
return webcapture_cdx
else:
return None
def extract_embeds(soup):
embeds = set()
# <link href="">
for tag in soup.find_all('link', href=True):
if tag['href'].startswith('/web/'):
embeds.add(tag['href'])
# <img src="">
for tag in soup.find_all('img', src=True):
if tag['src'].startswith('/web/'):
embeds.add(tag['src'])
# <script src="">
for tag in soup.find_all('script', src=True):
if tag['src'].startswith('/web/'):
embeds.add(tag['src'])
return list(embeds)
def static_wayback_webcapture(wayback_url, cdx_output=None):
"""
Given a complete wayback machine capture URL, like:
http://web.archive.org/web/20010712114837/http://www.dlib.org/dlib/june01/reich/06reich.html
Will return a new ("bare") fatcat webcapture entity python object, with all
the CDX entries filled in.
"""
wbm_html = fetch_wbm(wayback_url)
raw_timestamp, timestamp, original_url = parse_wbm_url(wayback_url)
#with open(rewritten_path, 'r') as fp:
# soup = BeautifulSoup(fp, "lxml")
soup = BeautifulSoup(wbm_html, "lxml")
embeds = extract_embeds(soup)
cdx_obj = lookup_cdx("/web/{}/{}".format(raw_timestamp, original_url),
cdx_output=cdx_output)
cdx_list = [cdx_obj]
for url in embeds:
cdx_obj = lookup_cdx(url, cdx_output=cdx_output)
cdx_list.append(cdx_obj)
archive_urls = WebcaptureEntityArchiveUrls(
rel="wayback",
url="https://web.archive.org/web/",
)
wc = WebcaptureEntity(
cdx=cdx_list,
timestamp=timestamp,
original_url=original_url,
archive_urls=archive_urls,
release_ids=None)
return wc
def main():
parser = argparse.ArgumentParser()
parser.add_argument('--verbose',
action='store_true',
help="verbose output")
parser.add_argument('wayback_url',
type=str,
help="URL of wayback capture to extract from")
parser.add_argument('--json-output',
type=argparse.FileType('w'), default=sys.stdout,
help="where to write out webcapture entity (as JSON)")
parser.add_argument('--cdx-output',
type=argparse.FileType('w'), default=None,
help="(optional) file to write out CDX stub")
args = parser.parse_args()
# entity-to-JSON code; duplicate of entity_to_dict()
api_client = ApiClient()
wc = static_wayback_webcapture(args.wayback_url, cdx_output=args.cdx_output)
wc_dict = api_client.sanitize_for_serialization(wc)
print(json.dumps(wc_dict))
if __name__ == '__main__':
main()
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