1 files changed, 97 insertions, 0 deletions
diff --git a/crocoite/tools.py b/crocoite/tools.py
new file mode 100644
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+++ b/crocoite/tools.py
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+# Copyright (c) 2018 crocoite contributors
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+"""
+Misc tools
+"""
+
+import shutil, sys, re, os, logging, argparse
+from warcio.archiveiterator import ArchiveIterator
+from warcio.warcwriter import WARCWriter
+
+def mergeWarc ():
+    """
+    Merge multiple WARC files into a single file, writing revisit records for
+    items which occur multiple times
+    """
+
+    parser = argparse.ArgumentParser(description='Merge WARCs, reads filenames from stdin.')
+    parser.add_argument('--verbose', '-v', action='store_true')
+    parser.add_argument('output', type=argparse.FileType ('wb'), help='Output WARC')
+
+    args = parser.parse_args()
+    loglevel = logging.DEBUG if args.verbose else logging.INFO
+    logging.basicConfig (level=loglevel)
+
+    unique = 0
+    revisit = 0
+    payloadMap = {}
+    writer = WARCWriter (args.output, gzip=True)
+    for l in sys.stdin:
+        l = l.strip ()
+        with open (l, 'rb') as fd:
+            for record in ArchiveIterator (fd):
+                if record.rec_type in {'resource', 'response'}:
+                    headers = record.rec_headers
+                    rid = headers.get_header('WARC-Record-ID')
+                    csum = headers.get_header('WARC-Payload-Digest')
+                    dup = payloadMap.get (csum, None)
+                    if dup is None:
+                        payloadMap[csum] = {'uri': headers.get_header('WARC-Target-URI'),
+                                'id': rid, 'date': headers.get_header('WARC-Date')}
+                        unique += 1
+                    else:
+                        logging.debug ('Record {} is duplicate of {}'.format (rid, dup['id']))
+                        record = writer.create_revisit_record (dup['uri'], csum, dup['uri'], dup['date'])
+                        record.rec_headers.add_header ('WARC-Truncated', 'length')
+                        record.rec_headers.add_header ('WARC-Refers-To', dup['id'])
+                        revisit += 1
+                else:
+                    unique += 1
+                writer.write_record (record)
+    logging.info ('Wrote {} unique records, {} revisits'.format (unique, revisit))
+
+def extractScreenshot ():
+    """
+    Extract page screenshots from a WARC generated by crocoite into files
+    """
+
+    parser = argparse.ArgumentParser(description='Extract screenshots.')
+    parser.add_argument('-f', '--force', action='store_true', help='Overwrite existing files')
+    parser.add_argument('input', type=argparse.FileType ('rb'), help='Input WARC')
+    parser.add_argument('prefix', help='Output file prefix')
+
+    args = parser.parse_args()
+
+    screenshotRe = re.compile (r'^urn:crocoite:screenshot-(\d+)-(\d+).png$', re.I)
+    with args.input:
+        for record in ArchiveIterator(args.input):
+            uri = record.rec_headers.get_header('WARC-Target-URI')
+            if record.rec_type == 'resource':
+                m = screenshotRe.match (uri)
+                xoff, yoff = m.groups ()
+                if m:
+                    outpath = '{}-{}-{}.png'.format (args.prefix, xoff, yoff)
+                    if args.force or not os.path.exists (outpath):
+                        with open (outpath, 'wb') as out:
+                            shutil.copyfileobj (record.raw_stream, out)
+                    else:
+                        print ('not overwriting {}'.format (outpath))
+