Plugin system: allow plugins to provide custom routes

  - each route will be prefixed by `/plugin/<plugin_name>`
  - add a new template for plugins rendering
  - add a live example in the demo_plugin

Check out the "Plugin System" documentation for more detail.

Related to #143

3 files changed, 96 insertions, 11 deletions

diff --git a/application/container/ContainerBuilder.php b/application/container/ContainerBuilder.php
index f0234eca..6d69a880 100644
--- a/application/container/ContainerBuilder.php
+++ b/application/container/ContainerBuilder.php
@@ -50,6 +50,9 @@ class ContainerBuilder
     /** @var LoginManager */
     protected $login;
 
+    /** @var PluginManager */
+    protected $pluginManager;
+
     /** @var LoggerInterface */
     protected $logger;
 
@@ -61,12 +64,14 @@ class ContainerBuilder
         SessionManager $session,
         CookieManager $cookieManager,
         LoginManager $login,
+        PluginManager $pluginManager,
         LoggerInterface $logger
     ) {
         $this->conf = $conf;
         $this->session = $session;
         $this->login = $login;
         $this->cookieManager = $cookieManager;
+        $this->pluginManager = $pluginManager;
         $this->logger = $logger;
     }
 
@@ -78,12 +83,10 @@ class ContainerBuilder
         $container['sessionManager'] = $this->session;
         $container['cookieManager'] = $this->cookieManager;
         $container['loginManager'] = $this->login;
+        $container['pluginManager'] = $this->pluginManager;
         $container['logger'] = $this->logger;
         $container['basePath'] = $this->basePath;
 
-        $container['plugins'] = function (ShaarliContainer $container): PluginManager {
-            return new PluginManager($container->conf);
-        };
 
         $container['history'] = function (ShaarliContainer $container): History {
             return new History($container->conf->get('resource.history'));
@@ -113,14 +116,6 @@ class ContainerBuilder
             );
         };
 
-        $container['pluginManager'] = function (ShaarliContainer $container): PluginManager {
-            $pluginManager = new PluginManager($container->conf);
-
-            $pluginManager->load($container->conf->get('general.enabled_plugins'));
-
-            return $pluginManager;
-        };
-
         $container['formatterFactory'] = function (ShaarliContainer $container): FormatterFactory {
             return new FormatterFactory(
                 $container->conf,
diff --git a/application/plugin/PluginManager.php b/application/plugin/PluginManager.php
index 3ea55728..7fc0cb04 100644
--- a/application/plugin/PluginManager.php
+++ b/application/plugin/PluginManager.php
@@ -4,6 +4,7 @@ namespace Shaarli\Plugin;
 
 use Shaarli\Config\ConfigManager;
 use Shaarli\Plugin\Exception\PluginFileNotFoundException;
+use Shaarli\Plugin\Exception\PluginInvalidRouteException;
 
 /**
  * Class PluginManager
@@ -26,6 +27,14 @@ class PluginManager
      */
     private $loadedPlugins = [];
 
+    /** @var array List of registered routes. Contains keys:
+     *               - `method`: HTTP method, GET/POST/PUT/PATCH/DELETE
+     *               - `route` (path): without prefix, e.g. `/up/{variable}`
+     *                 It will be later prefixed by `/plugin/<plugin name>/`.
+     *               - `callable` string, function name or FQN class's method, e.g. `demo_plugin_custom_controller`.
+     */
+    protected $registeredRoutes = [];
+
     /**
      * @var ConfigManager Configuration Manager instance.
      */
@@ -86,6 +95,9 @@ class PluginManager
                 $this->loadPlugin($dirs[$index], $plugin);
             } catch (PluginFileNotFoundException $e) {
                 error_log($e->getMessage());
+            } catch (\Throwable $e) {
+                $error = $plugin . t(' [plugin incompatibility]: ') . $e->getMessage();
+                $this->errors = array_unique(array_merge($this->errors, [$error]));
             }
         }
     }
@@ -166,6 +178,22 @@ class PluginManager
             }
         }
 
+        $registerRouteFunction = $pluginName . '_register_routes';
+        $routes = null;
+        if (function_exists($registerRouteFunction)) {
+            $routes = call_user_func($registerRouteFunction);
+        }
+
+        if ($routes !== null) {
+            foreach ($routes as $route) {
+                if (static::validateRouteRegistration($route)) {
+                    $this->registeredRoutes[$pluginName][] = $route;
+                } else {
+                    throw new PluginInvalidRouteException($pluginName);
+                }
+            }
+        }
+
         $this->loadedPlugins[] = $pluginName;
     }
 
@@ -238,6 +266,14 @@ class PluginManager
     }
 
     /**
+     * @return array List of registered custom routes by plugins.
+     */
+    public function getRegisteredRoutes(): array
+    {
+        return $this->registeredRoutes;
+    }
+
+    /**
      * Return the list of encountered errors.
      *
      * @return array List of errors (empty array if none exists).
@@ -246,4 +282,32 @@ class PluginManager
     {
         return $this->errors;
     }
+
+    /**
+     * Checks whether provided input is valid to register a new route.
+     * It must contain keys `method`, `route`, `callable` (all strings).
+     *
+     * @param string[] $input
+     *
+     * @return bool
+     */
+    protected static function validateRouteRegistration(array $input): bool
+    {
+        if (
+            !array_key_exists('method', $input)
+            || !in_array(strtoupper($input['method']), ['GET', 'PUT', 'PATCH', 'POST', 'DELETE'])
+        ) {
+            return false;
+        }
+
+        if (!array_key_exists('route', $input) || !preg_match('#^[a-z\d/\.\-_]+$#', $input['route'])) {
+            return false;
+        }
+
+        if (!array_key_exists('callable', $input)) {
+            return false;
+        }
+
+        return true;
+    }
 }
diff --git a/application/plugin/exception/PluginInvalidRouteException.php b/application/plugin/exception/PluginInvalidRouteException.php
new file mode 100644
index 00000000..6ba9bc43
--- /dev/null
+++ b/application/plugin/exception/PluginInvalidRouteException.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Plugin\Exception;
+
+use Exception;
+
+/**
+ * Class PluginFileNotFoundException
+ *
+ * Raise when plugin files can't be found.
+ */
+class PluginInvalidRouteException extends Exception
+{
+    /**
+     * Construct exception with plugin name.
+     * Generate message.
+     *
+     * @param string $pluginName name of the plugin not found
+     */
+    public function __construct()
+    {
+        $this->message = 'trying to register invalid route.';
+    }
+}