Add manual configuration for root URL

This new setting under 'general.root_url' allows to override automatic discovery of Shaarli instance's URL.

Fixes #1339

application/feed/FeedBuilder.php

@@ -122,9 +122,9 @@ public function buildData(string $feedType, ?array $userInput)
         $data['language'] = $this->getTypeLanguage($feedType);
         $data['last_update'] = $this->getLatestDateFormatted($feedType);
         $data['show_dates'] = !$this->hideDates || $this->isLoggedIn;
-        // Remove leading slash from REQUEST_URI.
-        $data['self_link'] = escape(server_url($this->serverInfo))
-            . escape($this->serverInfo['REQUEST_URI']);
+        // Remove leading path from REQUEST_URI (already contained in $pageaddr).
+        $requestUri = preg_replace('#(.*?/)(feed.*)#', '$2', escape($this->serverInfo['REQUEST_URI']));
+        $data['self_link'] = $pageaddr . $requestUri;
         $data['index_url'] = $pageaddr;
         $data['usepermalinks'] = $this->usePermalinks === true;
         $data['links'] = $linkDisplayed;

application/http/HttpUtils.php

@@ -369,7 +369,11 @@ function server_url($server)
  */
 function index_url($server)
 {
-    $scriptname = $server['SCRIPT_NAME'] ?? '';
+    if (defined('SHAARLI_ROOT_URL') && null !== SHAARLI_ROOT_URL) {
+        return rtrim(SHAARLI_ROOT_URL, '/') . '/';
+    }
+
+    $scriptname = !empty($server['SCRIPT_NAME']) ? $server['SCRIPT_NAME'] : '/';
     if (endsWith($scriptname, 'index.php')) {
         $scriptname = substr($scriptname, 0, -9);
     }
@@ -392,7 +396,7 @@ function page_url($server)
         $scriptname = substr($scriptname, 0, -9);
     }
 
-    $route = ltrim($server['REQUEST_URI'] ?? '', $scriptname);
+    $route = preg_replace('@^' . $scriptname . '@', '', $server['REQUEST_URI'] ?? '');
     if (! empty($server['QUERY_STRING'])) {
         return index_url($server) . $route . '?' . $server['QUERY_STRING'];
     }

doc/md/Shaarli-configuration.md

@@ -151,6 +151,7 @@ _These settings should not be edited_
 - **enabled_plugins**: List of enabled plugins.
 - **default_note_title**: Default title of a new note.
 - **retrieve_description** (boolean): If set to true, for every new Shaare Shaarli will try to retrieve the description and keywords from the HTML meta tags.
+- **root_url**: Overrides automatic discovery of Shaarli instance's URL (e.g.) `https://sub.domain.tld/shaarli-folder/`.
 
 ### Security
 

index.php

@@ -35,6 +35,9 @@
 
 $conf = new ConfigManager();
 
+// Manually override root URL for complex server configurations
+define('SHAARLI_ROOT_URL', $conf->get('general.root_url', null));
+
 // In dev mode, throw exception on any warning
 if ($conf->get('dev.debug', false)) {
     // See all errors (for debugging only)

tests/http/HttpUtils/IndexUrlTest.php

@@ -5,12 +5,14 @@
 
 namespace Shaarli\Http;
 
+use PHPUnit\Framework\TestCase;
+
 require_once 'application/http/HttpUtils.php';
 
 /**
  * Unitary tests for index_url()
  */
-class IndexUrlTest extends \PHPUnit\Framework\TestCase
+class IndexUrlTest extends TestCase
 {
     /**
      * If on the main page, remove "index.php" from the URL resource
@@ -103,4 +105,36 @@ public function testPageUrlWithRoute()
             )
         );
     }
+
+    /**
+     * The route is stored in REQUEST_URI and subfolder
+     */
+    public function testPageUrlWithRouteUnderSubfolder()
+    {
+        $this->assertEquals(
+            'http://host.tld/subfolder/picture-wall',
+            page_url(
+                array(
+                    'HTTPS' => 'Off',
+                    'SERVER_NAME' => 'host.tld',
+                    'SERVER_PORT' => '80',
+                    'SCRIPT_NAME' => '/subfolder/index.php',
+                    'REQUEST_URI' => '/subfolder/picture-wall',
+                )
+            )
+        );
+
+        $this->assertEquals(
+            'http://host.tld/subfolder/admin/picture-wall',
+            page_url(
+                array(
+                    'HTTPS' => 'Off',
+                    'SERVER_NAME' => 'host.tld',
+                    'SERVER_PORT' => '80',
+                    'SCRIPT_NAME' => '/subfolder/admin/index.php',
+                    'REQUEST_URI' => '/subfolder/admin/picture-wall',
+                )
+            )
+        );
+    }
 }

tests/http/HttpUtils/IndexUrlTestWithConstant.php

@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Http;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test index_url with SHAARLI_ROOT_URL defined to override automatic retrieval.
+ * This should stay in its dedicated class to make sure to not alter other tests of the suite.
+ */
+class IndexUrlTestWithConstant extends TestCase
+{
+    public static function setUpBeforeClass(): void
+    {
+        define('SHAARLI_ROOT_URL', 'http://other-host.tld/subfolder/');
+    }
+
+    /**
+     * The route is stored in REQUEST_URI and subfolder
+     */
+    public function testIndexUrlWithConstantDefined()
+    {
+        $this->assertEquals(
+            'http://other-host.tld/subfolder/',
+            index_url(
+                array(
+                    'HTTPS' => 'Off',
+                    'SERVER_NAME' => 'host.tld',
+                    'SERVER_PORT' => '80',
+                    'SCRIPT_NAME' => '/index.php',
+                    'REQUEST_URI' => '/picture-wall',
+                )
+            )
+        );
+
+        $this->assertEquals(
+            'http://other-host.tld/subfolder/',
+            index_url(
+                array(
+                    'HTTPS' => 'Off',
+                    'SERVER_NAME' => 'host.tld',
+                    'SERVER_PORT' => '80',
+                    'SCRIPT_NAME' => '/admin/index.php',
+                    'REQUEST_URI' => '/admin/picture-wall',
+                )
+            )
+        );
+    }
+}