Added plugin to upload generated gallery to Amazon S3

AUTHORS

@@ -2,6 +2,7 @@ Sigal is written and maintained by Simon Conseil and contributors (in
 alphabetical order):
 
 - Christophe-Marie Duquesne
+- Jonas Kaufmann
 - Antoine Pitrou
 - Matthias Vogelgesang
 - Vikram Shirgur

sigal/plugins/upload_s3.py

@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+
+"""Plugin to upload generated files to Amazon S3.
+
+This plugin requires boto_. All generated files are uploaded to a specified S3 bucket.
+When using this plugin you have to make sure that the bucket already exists and the 
+you have access to the S3 bucket. The access credentials are managed by boto_ and
+can be given as environment variables, configuration files etc. More information
+can be found on the boto_ documentation.
+
+.. _boto: https://pypi.python.org/pypi/boto
+
+Settings (all settings are wrapped in ``upload_s3_options`` dict):
+
+- ``bucket``: The to-be-used bucket for uploading.
+
+"""
+
+import logging
+import os
+from sigal import signals
+import boto
+from boto.s3.key import Key
+
+logger = logging.getLogger(__name__)
+
+
+def upload_s3(gallery, settings=None):
+    upload_files = []
+
+    for album in gallery.albums.values():
+        logger.debug("Processing album: %s" % (album))
+        for media in album.medias:
+            upload_files.append(os.path.join(album.path, media.filename))
+            upload_files.append(os.path.join(album.path, gallery.settings['thumb_dir'], media.filename))
+
+        # generated HTML files
+        html_file_upload_path = album.path if album.path != '.' else ''
+        upload_files.append(os.path.join(html_file_upload_path, album.output_file))
+
+    # static directory from template
+    static_path = os.path.join(gallery.settings['destination'], 'static')
+    static_files = [ os.path.join(root[len(gallery.settings['destination'])+1:], name) 
+                     for root, dirs, files in os.walk(static_path) 
+                     for name in files ]
+    upload_files += static_files
+
+
+    conn = boto.connect_s3()
+    bucket = conn.get_bucket(gallery.settings['upload_s3_options']['bucket'])
+    for f in upload_files:
+        logger.debug("Uploading file %s" % (f))
+        key = Key(bucket)
+        key.key = f
+        key.set_contents_from_filename(os.path.join(gallery.settings['destination'], f))
+    return None
+
+
+def register(settings):
+    if settings.get('upload_s3_options'):
+        signals.gallery_build.connect(upload_s3)
+    else:
+        logger.warning('Upload to S3 is not configured.')