Implement caching mechanism

administrator/components/com_patchtester/config.xml

@@ -29,7 +29,7 @@
 			<option value="0">JNO</option>
 		</field>
 
-		<field name="cache_lifetime" type="password" default="60"
+		<field name="cache_lifetime" type="text" default="60"
 			description="COM_PATCHTESTER_FIELD_CACHE_LIFETIME_DESC"
 			label="COM_PATCHTESTER_FIELD_CACHE_LIFETIME_LABEL"
 		/>

administrator/components/com_patchtester/controller.php

@@ -23,4 +23,32 @@ class PatchTesterController extends JControllerLegacy
 	 * @since  1.0
 	 */
 	protected $default_view = 'pulls';
+
+	/**
+	 * Method to purge the cache
+	 *
+	 * @return  void
+	 *
+	 * @since   2.0
+	 */
+	public function purge()
+	{
+		// Check for request forgeries
+		JSession::checkToken() or jexit(JText::_('JINVALID_TOKEN'));
+
+		jimport('joomla.filesystem.file');
+
+		if (file_exists(JPATH_CACHE . '/patchtester.json') && !JFile::delete(JPATH_CACHE . '/patchtester.json'))
+		{
+			$msg     = JText::_('COM_PATCHTESTER_PURGE_FAIL');
+			$msgType = 'error';
+		}
+		else
+		{
+			$msg     = JText::_('COM_PATCHTESTER_PURGE_SUCCESS');
+			$msgType = 'message';
+		}
+
+		$this->setRedirect('index.php?option=com_patchtester&view=pulls', $msg, $msgType);
+	}
 }

administrator/components/com_patchtester/language/en-GB/en-GB.com_patchtester.ini

@@ -33,6 +33,9 @@ COM_PATCHTESTER_NO_CREDENTIALS="No user credentials are saved, this will allow o
 COM_PATCHTESTER_NOT_APPLIED="Not Applied"
 COM_PATCHTESTER_OPEN_IN_GITHUB="Open in GitHub"
 COM_PATCHTESTER_OPEN_IN_JOOMLACODE="Open in JoomlaCode"
+COM_PATCHTESTER_PURGE_CACHE="Purge Cache"
+COM_PATCHTESTER_PURGE_FAIL="Could not purge the cache"
+COM_PATCHTESTER_PURGE_SUCCESS="Cache purged successfully"
 COM_PATCHTESTER_REPO_IS_GONE="The patch could not be applied because the repository is missing"
 COM_PATCHTESTER_REVERT_OK="Patch successfully reverted"
 COM_PATCHTESTER_REVERT_PATCH="Revert Patch"

administrator/components/com_patchtester/models/pulls.php

@@ -164,17 +164,63 @@ class PatchtesterModelPulls extends JModelList
 
 		$this->ordering = $this->getState('list.ordering', 'title');
 		$this->orderDir = $this->getState('list.direction', 'asc');
-		$search         = $this->getState('filter.search');
-		$searchId       = $this->getState('filter.searchid');
-
-		$page = $this->getPagination()->pagesCurrent;
 
 		try
+		{
+			$cacheFile = JPATH_CACHE . '/patchtester.json';
+			$params    = $this->getState('params');
+
+			// Check if caching is enabled
+			if ($params->get('cache', 1) == 1)
+			{
+				// Fetch cache time from component parameters and convert to seconds
+				$cacheTime = $params->get('cache_lifetime', 60);
+				$cacheTime = $cacheTime * 60;
+
+				// Cache files expired?
+				if (!file_exists($cacheFile) || (time() - @filemtime($cacheFile) > $cacheTime))
+				{
+					// Do a request to the GitHub API for new data
+					$pulls = $this->requestFromGithub();
+				}
+				else
+				{
+					// Render from the cached data
+					$pulls = json_decode(file_get_contents($cacheFile));
+				}
+			}
+			else
+			{
+				// No caching, request from GitHub
+				$pulls = $this->requestFromGithub();
+			}
+
+			return $pulls;
+		}
+		catch (Exception $e)
+		{
+			JFactory::getApplication()->enqueueMessage($e->getMessage(), 'error');
+
+			return array();
+		}
+	}
+
+	/**
+	 * Method to request new data from GitHub
+	 *
+	 * @return  array  Pull request data
+	 *
+	 * @since   2.0
+	 */
+	protected function requestFromGithub()
 	{
 		// If over the API limit, we can't build this list
-			// TODO - Cache the request data in case of API limiting
 		if ($this->rate->remaining > 0)
 		{
+			$page     = $this->getPagination()->pagesCurrent;
+			$search   = $this->getState('filter.search');
+			$searchId = $this->getState('filter.searchid');
+
 			$pulls = $this->github->pulls->getList($this->getState('github_user'), $this->getState('github_repo'), 'open', $page);
 			usort($pulls, array($this, 'sortItems'));
 
@@ -218,6 +264,15 @@ class PatchtesterModelPulls extends JModelList
 					}
 				}
 			}
+
+			// If caching is enabled, save the request data
+			$params = $this->getState('params');
+
+			if ($params->get('cache') == 1)
+			{
+				$data = json_encode($pulls);
+				file_put_contents(JPATH_CACHE . '/patchtester.json', $data);
+			}
 		}
 		else
 		{
@@ -226,13 +281,6 @@ class PatchtesterModelPulls extends JModelList
 
 		return $pulls;
 	}
-		catch (Exception $e)
-		{
-			JFactory::getApplication()->enqueueMessage($e->getMessage(), 'error');
-
-			return array();
-		}
-	}
 
 	/**
 	 * Method to sort the items array

administrator/components/com_patchtester/views/pulls/view.html.php

@@ -117,6 +117,7 @@ class PatchtesterViewPulls extends JViewLegacy
 	protected function addToolbar()
 	{
 		JToolBarHelper::title(JText::_('COM_PATCHTESTER'), 'patchtester');
+		JToolbarHelper::custom('purge', 'delete.png', 'delete_f2.png', 'COM_PATCHTESTER_PURGE_CACHE', false);
 		JToolBarHelper::preferences('com_patchtester');
 
 		JFactory::getDocument()->addStyleDeclaration(