Added endpoint to list APIs from whitelist

Author: lachiebol

API.php

@@ -24,6 +24,26 @@
  */
 class API extends \Piwik\Plugin\API
 {
+    /**
+     * Return the OpenApiDocs plugin whitelist from config/plugins.php.
+     *
+     * /index.php?module=API&method=OpenApiDocs.getPluginWhitelist
+     *
+     * @return array<int, string>
+     * @throws \Exception
+     */
+    public function getPluginWhitelist(): array
+    {
+        Piwik::checkUserHasSomeViewAccess();
+
+        $pluginWhitelist = $this->loadPluginWhitelist();
+        if (!is_array($pluginWhitelist)) {
+            throw new \Exception('OpenApiDocs plugin whitelist config is invalid.');
+        }
+
+        return $pluginWhitelist;
+    }
+
     /**
      * Get a pre-generated OpenAPI spec file if it exists. This endpoint only reads
      * the generated JSON file and does not trigger spec generation.
@@ -71,6 +91,14 @@ protected function getSpecFilePath(string $pluginName): string
         return $this->getSpecPathResolver()->getSpecFilePath($pluginName);
     }
 
+    /**
+     * @return mixed
+     */
+    protected function loadPluginWhitelist()
+    {
+        return require __DIR__ . '/config/plugins.php';
+    }
+
     protected function isSpecFileReadable(string $filePath): bool
     {
         return is_file($filePath) && is_readable($filePath);

tests/Unit/APITest.php

@@ -61,6 +61,31 @@ public function testGetOpenApiSpecReturnsDecodedJsonForPlugin()
         $this->assertSame($expectedSpec, $result);
     }
 
+    public function testGetPluginWhitelistReturnsConfigValuesInOrder()
+    {
+        $expectedWhitelist = ['RollUpReporting', 'Login', 'ActivityLog'];
+
+        $api = $this->getMockBuilder(API::class)
+            ->onlyMethods(['loadPluginWhitelist'])
+            ->getMock();
+        $api->method('loadPluginWhitelist')->willReturn($expectedWhitelist);
+
+        $this->assertSame($expectedWhitelist, $api->getPluginWhitelist());
+    }
+
+    public function testGetPluginWhitelistThrowsExceptionWhenConfigIsInvalid()
+    {
+        $api = $this->getMockBuilder(API::class)
+            ->onlyMethods(['loadPluginWhitelist'])
+            ->getMock();
+        $api->method('loadPluginWhitelist')->willReturn('invalid');
+
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('OpenApiDocs plugin whitelist config is invalid.');
+
+        $api->getPluginWhitelist();
+    }
+
     public function testGetOpenApiSpecThrowsExceptionWhenFileMissing()
     {
         $api = $this->buildApiMock('/tmp/CustomAlerts_openapi_spec_v1.0.0.json', false);