Changes allowing mapclient handle layer groups

mapclient/controllers/api.py

@@ -23,6 +23,7 @@
 import uuid
 import string
 import time
+import urllib2
 
 from mapclient.lib.ogr2ogr import main as ogr_export
 from publicamundi.data.api import *
@@ -569,6 +570,80 @@ def wps(self):
                 'details': (ex.message if config['dataapi.error.details'] else ''),
                 'token': None
             }, None)
+
+
+    def describe_layergroups(self):
+        """ Provides a json representation of GeoServer's Layer Group's structure
+        """
+        layer_groups_structure = {'layergroups':{}}
+
+        try:
+            layer_groups = self._get_layergroups()
+        except RuntimeError as ex:
+            return json.dumps(layer_groups_structure)
+
+        for layer_group in layer_groups:
+            layer_groups_structure['layergroups'][layer_group] = []
+
+            try:
+                members = self._get_layergroup_members(layer_group.split(':')[1])
+            except RuntimeError as ex:
+                members = []
+
+            for member in members:
+                layer_groups_structure['layergroups'][layer_group].append(member)
+
+        return json.dumps(layer_groups_structure)
+
+
+    def _get_layergroups(self):
+        workspace = config['mapclient.geoserver.workspace']        
+        path = 'workspaces/' + workspace + '/layergroups.json' 
+
+        result = json.loads(self._make_geoserver_rest_request(path))
+        layer_groups = []
+        if result['layerGroups'] and result['layerGroups']['layerGroup']:
+            layer_groups = [workspace + ':' + x['name'] for x in result['layerGroups']['layerGroup']]
+
+        return layer_groups
+
+
+
+    def _get_layergroup_members(self, layergroup):
+
+        workspace = config['mapclient.geoserver.workspace']
+        path = 'workspaces/' + workspace + '/layergroups/' + layergroup + '.json' 
+
+        result = json.loads(self._make_geoserver_rest_request(path))
+        members = [workspace + ':' + x['name'] for x in result['layerGroup']['publishables']['published']]
+
+        return members
+
+
+    def _make_geoserver_rest_request(self, path, data=None):
+        url = config['mapclient.geoserver.api_url'] + 'rest/' + path
+        username = config['mapclient.geoserver.username']
+        password = config['mapclient.geoserver.password']
+
+        request = urllib2.Request(url = url)
+
+        #TODO Check POST case
+        if data:
+            request.add_data(data.encode('utf-8'))
+
+        request.add_header('Authorization', 
+                           'Basic ' + ((username + ':' + password).encode('base64').rstrip()))
+        try:
+            response = urllib2.urlopen(request)
+        except urllib2.HTTPError as ex:
+            try:
+                detail = ex.read()
+            except:
+                detail = 'n/a'
+            raise RuntimeError('GeoServer REST Request \'%s\' failed with '
+                               'exception: \'%s\'. Details: %s' % (path, ex, detail))
+        return response.read()   
+
 
     def _parse_query(self):
         if request.environ["REQUEST_METHOD"] == 'POST':

mapclient/public/content/css/app/default.css

@@ -443,6 +443,10 @@ ul {
     border-bottom: solid 1px #E7E7E7;
 }
 
+.layer-group {
+    cursor: pointer;
+}
+
 .inactive {
     cursor: not-allowed;
 }
@@ -860,6 +864,14 @@ div.legend-container {
     width: 24px;
 }
 
+div.layergroup-legend-container > table {
+    width: 100%;
+}
+
+div.layergroup-legend-container td {
+	padding: 2px 5px 2px 5px;
+}
+
 img.legend {
     height: 24px;
     width: 24px;