Add screenshot extraction script to contrib/

1 files changed, 54 insertions, 0 deletions

diff --git a/contrib/extractScreenshot.py b/contrib/extractScreenshot.py
new file mode 100755
index 0000000..80911d5
--- /dev/null
+++ b/contrib/extractScreenshot.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2017 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.
+
+"""
+Extract page screenshots from a WARC generated by crocoite into files
+"""
+
+import shutil, sys, re, os
+from warcio.archiveiterator import ArchiveIterator
+
+if __name__ == '__main__':
+    import argparse
+
+    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))
+