Proper implementation of /bcloud/texture-libraries endpoint.

It now also checks for the existence of a group_texture node type,
and whether there are top-level group_texture nodes.

pillar/application/modules/blender_cloud.py

@@ -1,25 +1,61 @@
-from flask import Blueprint, request
+import logging
+
+from flask import Blueprint, request, current_app, g
 from eve.methods.get import get
 from eve.utils import config as eve_config
 
 from application import utils
+from application.utils.authorization import require_login
 
 TEXTURE_LIBRARY_QUERY_ARGS = {
     eve_config.QUERY_PROJECTION: utils.dumps({
-        'name': 1, 'url': 1, 'permissions': 1, 'node_types.name': 1,}),
+        'name': 1,
+        'url': 1,
+        'permissions': 1,
+    }),
     eve_config.QUERY_SORT: utils.dumps([('name', 1)]),
-    'max_results': 'null',}
+    'max_results': 'null',  # this needs to be there, or we get a KeyError.
+}
 
 blueprint = Blueprint('blender_cloud', __name__)
+log = logging.getLogger(__name__)
 
 
 @blueprint.route('/texture-libraries')
+@require_login()
 def texture_libraries():
     # Use Eve method so that we get filtering on permissions for free.
+    # This gives all the projects that contain the required node types.
     request.args = TEXTURE_LIBRARY_QUERY_ARGS
-    projects = get('projects', {'node_types.name': 'texture'})
+    groups = g.current_user['groups']
 
-    return utils.jsonify(projects)
+    result, _, _, status, headers = get(
+        'projects',
+        {'$or': [
+            {'permissions.groups': {'$in': groups}},
+            {'permissions.world': 'GET'}
+        ]})
+
+    if status == 200:
+        # Filter those projects that don't contain a top-level texture or group_texture node.
+        result['_items'] = [proj for proj in result['_items']
+                            if has_texture_node(proj)]
+
+    resp = utils.jsonify(result)
+    resp.headers.extend(headers)
+    return resp, status
+
+
+def has_texture_node(proj):
+    """Returns True iff the project has a top-level (group)texture node."""
+
+    nodes_collection = current_app.data.driver.db['nodes']
+
+    count = nodes_collection.count(
+        {'node_type': 'group_texture',
+         'project': proj['_id'],
+         'parent': None})
+    return count > 0
 
 
 def setup_app(app, url_prefix):