Add Gravatar fallback and improve logging

Readme.md

@@ -2,6 +2,8 @@
 
 A set of scripts to download profile images from Google and write them to vcards. Useful for completing the migration from Google to Nextcloud or ownCloud.
 
+As a fallback, if a user doesn't have a Google profile photo, the script will check [Gravatar](https://www.gravatar.com).
+
 ## Setup
 
 To run, you first need to set up a few config files

google_photo_to_vcard/add_photo.py

@@ -5,6 +5,7 @@ import vobject
 
 from google_photo_to_vcard.util import build_photo_path
 from google_photo_to_vcard.util import download_url_to_path
+from google_photo_to_vcard.util import generate_gravatar_url
 from google_photo_to_vcard.util import read_email_photo_json
 
 
@@ -52,15 +53,25 @@ def generate_cards():
 def main():
     email_to_photo = read_email_photo_json()
     for card, card_path in generate_cards():
+        if hasattr(card, 'photo'):
+            logging.info('%s has photo', card.fn.value)
+            continue
         for email_elem in card.contents.get('email', []):
             email = email_elem.value
             photo_path = Path(build_photo_path(email))
-            if not photo_path.exists() and email in email_to_photo:
-                download_url_to_path(email_to_photo[email], photo_path)
+            if not photo_path.exists():
+                if email in email_to_photo:
+                    logging.debug('Downloading google photo for %s', card.fn.value)
+                    download_url_to_path(email_to_photo[email], photo_path)
+                else:
+                    logging.debug('Downloading Gravatar photo for %s', card.fn.value)
+                    gravatar_url = generate_gravatar_url(email)
+                    download_url_to_path(gravatar_url, photo_path)
             if photo_path.exists():
                 if maybe_add_photo(card, photo_path):
                     write_card_to_path(card, card_path)
                     logging.info('Added photo to %s', card.fn.value)
+                    break
 
 
 if __name__ == '__main__':

google_photo_to_vcard/util.py

@@ -2,6 +2,7 @@ import json
 import logging
 import urllib.request as request
 from urllib.error import HTTPError
+from hashlib import md5
 
 
 EMAIL_TO_PHOTO_JSON_PATH = 'build/email_to_photo.json'
@@ -18,14 +19,22 @@ def read_email_photo_json():
 
 
 def build_photo_path(email):
-    return 'build/photos/{}.jpeg'.format(email)
+    return 'build/photos/{}.jpeg'.format(email.lower())
 
 
 def download_url_to_path(url, path):
     try:
-        with open(path, mode='xb') as f, request.urlopen(url) as r:
-            f.write(r.read())
+        with request.urlopen(url) as r:
+            with open(path, mode='xb') as f:
+                f.write(r.read())
             return path
     except HTTPError as e:
         logging.error(e)
         return None
+
+
+def generate_gravatar_url(email, size=200, default='404'):
+    email_hash = md5(email.lower().encode('utf-8')).hexdigest()
+    return 'https://www.gravatar.com/avatar/{}?s={}&d={}'.format(
+        email_hash, str(size), default
+    )