[afs] Implemented decodeUri for AFS provider

Allows retrieval of the web URL for an AFS layer

python/core/auto_generated/qgsproviderregistry.sip.in

@@ -96,12 +96,12 @@ Returns the provider capabilities
 
     QVariantMap decodeUri( const QString &providerKey, const QString &uri );
 %Docstring
-Returns the components (e.g. file path, layer name) of a provider uri
+Breaks a provider data source URI into its component paths (e.g. file path, layer name).
 
 :param providerKey: identifier of the provider
 :param uri: uri string
 
-:return: map containing components
+:return: map containing components. Standard components include "path", "layerName", "url".
 
 .. note::
 

src/core/qgsproviderregistry.h

@@ -108,12 +108,12 @@ class CORE_EXPORT QgsProviderRegistry
     int providerCapabilities( const QString &providerKey ) const;
 
     /**
-     * Returns the components (e.g. file path, layer name) of a provider uri
-        \param providerKey identifier of the provider
-        \param uri uri string
-        \returns map containing components
-        \note this function may not be supported by all providers, an empty map will be returned in such case
-        \since QGIS 3.4
+     * Breaks a provider data source URI into its component paths (e.g. file path, layer name).
+     * \param providerKey identifier of the provider
+     * \param uri uri string
+     * \returns map containing components. Standard components include "path", "layerName", "url".
+     * \note this function may not be supported by all providers, an empty map will be returned in such case
+     * \since QGIS 3.4
      */
     QVariantMap decodeUri( const QString &providerKey, const QString &uri );
 

src/providers/arcgisrest/qgsafsproviderextern.cpp

@@ -59,3 +59,12 @@ QGISEXTERN int dataCapabilities()
 {
   return  QgsDataProvider::Net;
 }
+
+QGISEXTERN QVariantMap decodeUri( const QString &uri )
+{
+  QgsDataSourceUri dsUri = QgsDataSourceUri( uri );
+
+  QVariantMap components;
+  components.insert( QStringLiteral( "url" ), dsUri.param( QStringLiteral( "url" ) ) );
+  return components;
+}

tests/src/python/test_provider_afs.py

@@ -28,7 +28,8 @@ from qgis.core import (NULL,
                        QgsApplication,
                        QgsSettings,
                        QgsRectangle,
-                       QgsCategorizedSymbolRenderer
+                       QgsCategorizedSymbolRenderer,
+                       QgsProviderRegistry
                        )
 from qgis.testing import (start_app,
                           unittest
@@ -417,6 +418,14 @@ class TestPyQgsAFSProvider(unittest.TestCase, ProviderTestCase):
         """
         pass
 
+    def testDecodeUri(self):
+        """
+        Test decoding an AFS uri
+        """
+        uri = self.vl.source()
+        parts = QgsProviderRegistry.instance().decodeUri(self.vl.dataProvider().name(), uri)
+        self.assertEqual(parts, {'url': 'http://' + self.basetestpath + '/fake_qgis_http_endpoint'})
+
     def testObjectIdDifferentName(self):
         """ Test that object id fields not named OBJECTID work correctly """