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authorBryan Newbold <bnewbold@robocracy.org>2019-03-19 15:23:48 -0700
committerBryan Newbold <bnewbold@robocracy.org>2019-03-19 15:23:48 -0700
commita712cf6a8732ba11d393b80e28b4fc487362ea00 (patch)
treee938c4c28541b0b105c5512461f3221d1dd3873e
parent81a82573dc78a8cbf2f86100043f74f1305f4c56 (diff)
downloadfatcat-a712cf6a8732ba11d393b80e28b4fc487362ea00.tar.gz
fatcat-a712cf6a8732ba11d393b80e28b4fc487362ea00.zip
initial wayback-to-webcapture helper
-rwxr-xr-xextra/demo_entities/static_wayback.py203
1 files changed, 203 insertions, 0 deletions
diff --git a/extra/demo_entities/static_wayback.py b/extra/demo_entities/static_wayback.py
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+++ b/extra/demo_entities/static_wayback.py
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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()