Validate license categories

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

src/licensedcode/data/licenses/cvwl.yml

@@ -1,7 +1,7 @@
 key: cvwl
 short_name: Collaborative Virtual Workspace License
 name: Collaborative Virtual Workspace License
-category: Proprietary
+category: Proprietary Free
 owner: Mitre
 homepage_url: https://opensource.org/licenses/mitrepl
 minimum_coverage: 30

src/licensedcode/data/licenses/ecma-documentation.yml

@@ -1,6 +1,6 @@
 key: ecma-documentation
 short_name: ECMA Documentation License
 name: ECMA Documentation License
-category: Free restricted
+category: Free Restricted
 owner: Ecma International
 homepage_url: http://www.ecma-international.org/publications/DISCLAIMER.pdf

src/licensedcode/data/licenses/flora-1.1.yml

@@ -1,7 +1,7 @@
 key: flora-1.1
 short_name: Flora License v1.1
 name: Flora License v1.1
-category: Proprietary
+category: Proprietary Free
 owner: Tizen Association
 
 other_urls:

src/licensedcode/data/licenses/redis-sala-proprietary-1.0.yml

@@ -1,5 +1,5 @@
 key: redis-sala-proprietary-1.0
 short_name: Redis Source Available License Agreement 1.0
 name: Redis Source Available License Agreement 1.0
-category: Proprietary
+category: Proprietary Free
 owner: Redis Labs Ltd.

src/licensedcode/data/licenses/us-govt-unlimited-rights.yml

@@ -1,7 +1,7 @@
 key: us-govt-unlimited-rights
 short_name: US govt. Unlimited Rights
 name: US govt. Unlimited Rights
-category: Unspecified
+category: Permissive
 owner: US Government
 text_urls:
     - https://github.com/Slicer/Slicer/blob/v4.6.2/COPYRIGHT.txt

src/licensedcode/models.py

@@ -69,6 +69,26 @@
 TRACE_REPR = False
 
 
+FOSS_CATEGORIES = set([
+    'Copyleft',
+    'Copyleft Limited',
+    'Patent License',
+    'Permissive',
+    'Public Domain',
+])
+
+
+OTHER_CATEGORIES = set([
+    'Commercial',
+    'Free Restricted',
+    'Proprietary Free',
+    'Unstated License',
+])
+
+
+CATEGORIES = FOSS_CATEGORIES | OTHER_CATEGORIES
+
+
 @attr.s(slots=True)
 class License(object):
     """
@@ -252,6 +272,7 @@ def load(self):
                     assert self.key == v, 'Inconsistent YAML key and file names for %r' % self.key
 
                 setattr(self, k, v)
+            assert self.category in CATEGORIES, 'Unknown license category: {}'.format(self.category)
 
         except Exception, e:
             # this is a rare case: fail loudly