Implement licenses.get_license_by_url

Rather than exploding in the user's face (for example if we custom-configure
licenses in our MG instance, and there are still media with now "unknown"
licenses in the db), simply return a License object as a fallback, where all
attributes are set to the URL we were handed.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/mediagoblin/tools/licenses.py b/mediagoblin/tools/licenses.py
index cda3c1f6..a964980e 100644
--- a/mediagoblin/tools/licenses.py
+++ b/mediagoblin/tools/licenses.py
@@ -50,6 +50,16 @@ SORTED_LICENSES = [
 SUPPORTED_LICENSES = dict(((l.uri, l) for l in SORTED_LICENSES))
 
 
+def get_license_by_url(url):
+    """Look up a license by its url and return the License object"""
+    try:
+        return SUPPORTED_LICENSES[url]
+    except KeyError:
+        # in case of an unknown License, just display the url given
+        # rather than exploding in the user's face.
+        return License(url, url, url)
+
+
 def licenses_as_choices():
     """List of (uri, abbreviation) tuples for HTML choice field population