Feature: Share private bookmarks using a URL containing a private key

  - Add a share link next to « Permalink » in linklist (using share icon
from fork awesome)
  - This link generates a private key associated to the bookmark
  - Accessing the bookmark while logged out with the proper key will
display it

Fixes #475

10 files changed, 268 insertions, 23 deletions

diff --git a/application/bookmark/BookmarkFileService.php b/application/bookmark/BookmarkFileService.php
index eb7899bf..14b3d620 100644
--- a/application/bookmark/BookmarkFileService.php
+++ b/application/bookmark/BookmarkFileService.php
@@ -97,12 +97,15 @@ class BookmarkFileService implements BookmarkServiceInterface
     /**
      * @inheritDoc
      */
-    public function findByHash(string $hash): Bookmark
+    public function findByHash(string $hash, string $privateKey = null): Bookmark
     {
         $bookmark = $this->bookmarkFilter->filter(BookmarkFilter::$FILTER_HASH, $hash);
         // PHP 7.3 introduced array_key_first() to avoid this hack
         $first = reset($bookmark);
-        if (! $this->isLoggedIn && $first->isPrivate()) {
+        if (!$this->isLoggedIn
+            && $first->isPrivate()
+            && (empty($privateKey) || $privateKey !== $first->getAdditionalContentEntry('private_key'))
+        ) {
             throw new Exception('Not authorized');
         }
 
diff --git a/application/bookmark/BookmarkServiceInterface.php b/application/bookmark/BookmarkServiceInterface.php
index 37a54d03..9fa61533 100644
--- a/application/bookmark/BookmarkServiceInterface.php
+++ b/application/bookmark/BookmarkServiceInterface.php
@@ -20,13 +20,14 @@ interface BookmarkServiceInterface
     /**
      * Find a bookmark by hash
      *
-     * @param string $hash
+     * @param string      $hash       Bookmark's hash
+     * @param string|null $privateKey Optional key used to access private links while logged out
      *
      * @return Bookmark
      *
      * @throws \Exception
      */
-    public function findByHash(string $hash): Bookmark;
+    public function findByHash(string $hash, string $privateKey = null);
 
     /**
      * @param $url
diff --git a/application/front/controller/admin/ManageShaareController.php b/application/front/controller/admin/ManageShaareController.php
index 908ebae3..e490f85a 100644
--- a/application/front/controller/admin/ManageShaareController.php
+++ b/application/front/controller/admin/ManageShaareController.php
@@ -321,6 +321,32 @@ class ManageShaareController extends ShaarliAdminController
     }
 
     /**
+     * GET /admin/shaare/private/{hash} - Attach a private key to given bookmark, then redirect to the sharing URL.
+     */
+    public function sharePrivate(Request $request, Response $response, array $args): Response
+    {
+        $this->checkToken($request);
+
+        $hash = $args['hash'] ?? '';
+        $bookmark = $this->container->bookmarkService->findByHash($hash);
+
+        if ($bookmark->isPrivate() !== true) {
+            return $this->redirect($response, '/shaare/' . $hash);
+        }
+
+        if (empty($bookmark->getAdditionalContentEntry('private_key'))) {
+            $privateKey = bin2hex(random_bytes(16));
+            $bookmark->addAdditionalContentEntry('private_key', $privateKey);
+            $this->container->bookmarkService->set($bookmark);
+        }
+
+        return $this->redirect(
+            $response,
+            '/shaare/' . $hash . '?key=' . $bookmark->getAdditionalContentEntry('private_key')
+        );
+    }
+
+    /**
      * Helper function used to display the shaare form whether it's a new or existing bookmark.
      *
      * @param array $link data used in template, either from parameters or from the data store
diff --git a/application/front/controller/visitor/BookmarkListController.php b/application/front/controller/visitor/BookmarkListController.php
index 5267c8f5..78c474c9 100644
--- a/application/front/controller/visitor/BookmarkListController.php
+++ b/application/front/controller/visitor/BookmarkListController.php
@@ -137,8 +137,10 @@ class BookmarkListController extends ShaarliVisitorController
      */
     public function permalink(Request $request, Response $response, array $args): Response
     {
+        $privateKey = $request->getParam('key');
+
         try {
-            $bookmark = $this->container->bookmarkService->findByHash($args['hash']);
+            $bookmark = $this->container->bookmarkService->findByHash($args['hash'], $privateKey);
         } catch (BookmarkNotFoundException $e) {
             $this->assignView('error_message', $e->getMessage());
 
diff --git a/inc/languages/fr/LC_MESSAGES/shaarli.po b/inc/languages/fr/LC_MESSAGES/shaarli.po
index db6bfa3e..3f14d22c 100644
--- a/inc/languages/fr/LC_MESSAGES/shaarli.po
+++ b/inc/languages/fr/LC_MESSAGES/shaarli.po
@@ -1,8 +1,8 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: Shaarli\n"
-"POT-Creation-Date: 2020-10-21 15:00+0200\n"
-"PO-Revision-Date: 2020-10-21 15:06+0200\n"
+"POT-Creation-Date: 2020-10-27 19:32+0100\n"
+"PO-Revision-Date: 2020-10-27 19:32+0100\n"
 "Last-Translator: \n"
 "Language-Team: Shaarli\n"
 "Language: fr_FR\n"
@@ -123,38 +123,38 @@ msgstr ""
 "l'extension php-gd doit être chargée pour utiliser les miniatures. Les "
 "miniatures sont désormais désactivées. Rechargez la page."
 
-#: application/Utils.php:383
+#: application/Utils.php:385
 msgid "Setting not set"
 msgstr "Paramètre non défini"
 
-#: application/Utils.php:390
+#: application/Utils.php:392
 msgid "Unlimited"
 msgstr "Illimité"
 
-#: application/Utils.php:393
+#: application/Utils.php:395
 msgid "B"
 msgstr "o"
 
-#: application/Utils.php:393
+#: application/Utils.php:395
 msgid "kiB"
 msgstr "ko"
 
-#: application/Utils.php:393
+#: application/Utils.php:395
 msgid "MiB"
 msgstr "Mo"
 
-#: application/Utils.php:393
+#: application/Utils.php:395
 msgid "GiB"
 msgstr "Go"
 
-#: application/bookmark/BookmarkFileService.php:180
-#: application/bookmark/BookmarkFileService.php:202
-#: application/bookmark/BookmarkFileService.php:224
-#: application/bookmark/BookmarkFileService.php:238
+#: application/bookmark/BookmarkFileService.php:183
+#: application/bookmark/BookmarkFileService.php:205
+#: application/bookmark/BookmarkFileService.php:227
+#: application/bookmark/BookmarkFileService.php:241
 msgid "You're not authorized to alter the datastore"
 msgstr "Vous n'êtes pas autorisé à modifier les données"
 
-#: application/bookmark/BookmarkFileService.php:205
+#: application/bookmark/BookmarkFileService.php:208
 msgid "This bookmarks already exists"
 msgstr "Ce marque-page existe déjà."
 
@@ -439,12 +439,12 @@ msgstr "ID du lien non valide."
 msgid "Invalid visibility provided."
 msgstr "Visibilité du lien non valide."
 
-#: application/front/controller/admin/ManageShaareController.php:352
+#: application/front/controller/admin/ManageShaareController.php:378
 #: tmp/linklist.b91ef64efc3688266305ea9b42e5017e.rtpl.php:171
 msgid "Edit"
 msgstr "Modifier"
 
-#: application/front/controller/admin/ManageShaareController.php:355
+#: application/front/controller/admin/ManageShaareController.php:381
 #: tmp/page.header.b91ef64efc3688266305ea9b42e5017e.rtpl.php:28
 #: tmp/page.header.cedf684561d925457130839629000a81.rtpl.php:28
 msgid "Shaare"
@@ -551,7 +551,7 @@ msgstr "Hier"
 msgid "Daily"
 msgstr "Quotidien"
 
-#: application/front/controller/visitor/ErrorController.php:36
+#: application/front/controller/visitor/ErrorController.php:33
 msgid "An unexpected error occurred."
 msgstr "Une erreur inattendue s'est produite."
 
@@ -604,7 +604,7 @@ msgstr "Permissions insuffisantes :"
 msgid "Login"
 msgstr "Connexion"
 
-#: application/front/controller/visitor/LoginController.php:78
+#: application/front/controller/visitor/LoginController.php:77
 msgid "Wrong login/password."
 msgstr "Nom d'utilisateur ou mot de passe incorrect(s)."
 
@@ -738,7 +738,7 @@ msgstr "Impossible de purger %s : le répertoire n'existe pas"
 msgid "An error occurred while running the update "
 msgstr "Une erreur s'est produite lors de l'exécution de la mise à jour "
 
-#: index.php:65
+#: index.php:80
 msgid "Shared bookmarks on "
 msgstr "Liens partagés sur "
 
@@ -1376,6 +1376,10 @@ msgstr "Changer statut épinglé"
 msgid "Sticky"
 msgstr "Épinglé"
 
+#: tmp/linklist.b91ef64efc3688266305ea9b42e5017e.rtpl.php:189
+msgid "Share a private link"
+msgstr "Partager un lien privé"
+
 #: tmp/linklist.paging.b91ef64efc3688266305ea9b42e5017e.rtpl.php:5
 #: tmp/linklist.paging.cedf684561d925457130839629000a81.rtpl.php:5
 msgid "Filters"
diff --git a/index.php b/index.php
index a46e32c9..0ed52bad 100644
--- a/index.php
+++ b/index.php
@@ -128,6 +128,7 @@ $app->group('/admin', function () {
     $this->get('/add-shaare', '\Shaarli\Front\Controller\Admin\ManageShaareController:addShaare');
     $this->get('/shaare', '\Shaarli\Front\Controller\Admin\ManageShaareController:displayCreateForm');
     $this->get('/shaare/{id:[0-9]+}', '\Shaarli\Front\Controller\Admin\ManageShaareController:displayEditForm');
+    $this->get('/shaare/private/{hash}', '\Shaarli\Front\Controller\Admin\ManageShaareController:sharePrivate');
     $this->post('/shaare', '\Shaarli\Front\Controller\Admin\ManageShaareController:save');
     $this->get('/shaare/delete', '\Shaarli\Front\Controller\Admin\ManageShaareController:deleteBookmark');
     $this->get('/shaare/visibility', '\Shaarli\Front\Controller\Admin\ManageShaareController:changeVisibility');
diff --git a/tests/bookmark/BookmarkFileServiceTest.php b/tests/bookmark/BookmarkFileServiceTest.php
index daafd250..47970117 100644
--- a/tests/bookmark/BookmarkFileServiceTest.php
+++ b/tests/bookmark/BookmarkFileServiceTest.php
@@ -898,6 +898,37 @@ class BookmarkFileServiceTest extends TestCase
     }
 
     /**
+     * Test filterHash() on a private bookmark while logged out.
+     */
+    public function testFilterHashPrivateWhileLoggedOut()
+    {
+        $this->expectException(\Exception::class);
+        $this->expectExceptionMessage('Not authorized');
+
+        $hash = smallHash('20141125_084734' . 6);
+
+        $this->publicLinkDB->findByHash($hash);
+    }
+
+    /**
+     * Test filterHash() with private key.
+     */
+    public function testFilterHashWithPrivateKey()
+    {
+        $hash = smallHash('20141125_084734' . 6);
+        $privateKey = 'this is usually auto generated';
+
+        $bookmark = $this->privateLinkDB->findByHash($hash);
+        $bookmark->addAdditionalContentEntry('private_key', $privateKey);
+        $this->privateLinkDB->save();
+
+        $this->privateLinkDB = new BookmarkFileService($this->conf, $this->history, $this->mutex, false);
+        $bookmark = $this->privateLinkDB->findByHash($hash, $privateKey);
+
+        static::assertSame(6, $bookmark->getId());
+    }
+
+    /**
      * Test linksCountPerTag all tags without filter.
      * Equal occurrences should be sorted alphabetically.
      */
diff --git a/tests/front/controller/admin/ManageShaareControllerTest/SharePrivateTest.php b/tests/front/controller/admin/ManageShaareControllerTest/SharePrivateTest.php
new file mode 100644
index 00000000..1e7877c7
--- /dev/null
+++ b/tests/front/controller/admin/ManageShaareControllerTest/SharePrivateTest.php
@@ -0,0 +1,139 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Admin\ManageShaareControllerTest;
+
+use Shaarli\Bookmark\Bookmark;
+use Shaarli\Front\Controller\Admin\FrontAdminControllerMockHelper;
+use Shaarli\Front\Controller\Admin\ManageShaareController;
+use Shaarli\Http\HttpAccess;
+use Shaarli\TestCase;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Test GET /admin/shaare/private/{hash}
+ */
+class SharePrivateTest extends TestCase
+{
+    use FrontAdminControllerMockHelper;
+
+    /** @var ManageShaareController */
+    protected $controller;
+
+    public function setUp(): void
+    {
+        $this->createContainer();
+
+        $this->container->httpAccess = $this->createMock(HttpAccess::class);
+        $this->controller = new ManageShaareController($this->container);
+    }
+
+    /**
+     * Test shaare private with a private bookmark which does not have a key yet.
+     */
+    public function testSharePrivateWithNewPrivateBookmark(): void
+    {
+        $hash = 'abcdcef';
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $bookmark = (new Bookmark())
+            ->setId(123)
+            ->setUrl('http://domain.tld')
+            ->setTitle('Title 123')
+            ->setPrivate(true)
+        ;
+
+        $this->container->bookmarkService
+            ->expects(static::once())
+            ->method('findByHash')
+            ->with($hash)
+            ->willReturn($bookmark)
+        ;
+        $this->container->bookmarkService
+            ->expects(static::once())
+            ->method('set')
+            ->with($bookmark, true)
+            ->willReturnCallback(function (Bookmark $bookmark): Bookmark {
+                static::assertSame(32, strlen($bookmark->getAdditionalContentEntry('private_key')));
+
+                return $bookmark;
+            })
+        ;
+
+        $result = $this->controller->sharePrivate($request, $response, ['hash' => $hash]);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertRegExp('#/subfolder/shaare/' . $hash . '\?key=\w{32}#', $result->getHeaderLine('Location'));
+    }
+
+    /**
+     * Test shaare private with a private bookmark which does already have a key.
+     */
+    public function testSharePrivateWithExistingPrivateBookmark(): void
+    {
+        $hash = 'abcdcef';
+        $existingKey = 'this is a private key';
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $bookmark = (new Bookmark())
+            ->setId(123)
+            ->setUrl('http://domain.tld')
+            ->setTitle('Title 123')
+            ->setPrivate(true)
+            ->addAdditionalContentEntry('private_key', $existingKey)
+        ;
+
+        $this->container->bookmarkService
+            ->expects(static::once())
+            ->method('findByHash')
+            ->with($hash)
+            ->willReturn($bookmark)
+        ;
+        $this->container->bookmarkService
+            ->expects(static::never())
+            ->method('set')
+        ;
+
+        $result = $this->controller->sharePrivate($request, $response, ['hash' => $hash]);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame('/subfolder/shaare/' . $hash . '?key=' . $existingKey, $result->getHeaderLine('Location'));
+    }
+
+    /**
+     * Test shaare private with a public bookmark.
+     */
+    public function testSharePrivateWithPublicBookmark(): void
+    {
+        $hash = 'abcdcef';
+        $request = $this->createMock(Request::class);
+        $response = new Response();
+
+        $bookmark = (new Bookmark())
+            ->setId(123)
+            ->setUrl('http://domain.tld')
+            ->setTitle('Title 123')
+            ->setPrivate(false)
+        ;
+
+        $this->container->bookmarkService
+            ->expects(static::once())
+            ->method('findByHash')
+            ->with($hash)
+            ->willReturn($bookmark)
+        ;
+        $this->container->bookmarkService
+            ->expects(static::never())
+            ->method('set')
+        ;
+
+        $result = $this->controller->sharePrivate($request, $response, ['hash' => $hash]);
+
+        static::assertSame(302, $result->getStatusCode());
+        static::assertSame('/subfolder/shaare/' . $hash, $result->getHeaderLine('Location'));
+    }
+}
diff --git a/tests/front/controller/visitor/BookmarkListControllerTest.php b/tests/front/controller/visitor/BookmarkListControllerTest.php
index 5ca92507..5cbc8c73 100644
--- a/tests/front/controller/visitor/BookmarkListControllerTest.php
+++ b/tests/front/controller/visitor/BookmarkListControllerTest.php
@@ -292,6 +292,37 @@ class BookmarkListControllerTest extends TestCase
     }
 
     /**
+     * Test GET /shaare/{hash}?key={key} - Find a link by hash using a private link.
+     */
+    public function testPermalinkWithPrivateKey(): void
+    {
+        $hash = 'abcdef';
+        $privateKey = 'this is a private key';
+
+        $assignedVariables = [];
+        $this->assignTemplateVars($assignedVariables);
+
+        $request = $this->createMock(Request::class);
+        $request->method('getParam')->willReturnCallback(function (string $key, $default = null) use ($privateKey) {
+            return $key === 'key' ? $privateKey : $default;
+        });
+        $response = new Response();
+
+        $this->container->bookmarkService
+            ->expects(static::once())
+            ->method('findByHash')
+            ->with($hash, $privateKey)
+            ->willReturn((new Bookmark())->setId(123)->setTitle('Title 1')->setUrl('http://url1.tld'))
+        ;
+
+        $result = $this->controller->permalink($request, $response, ['hash' => $hash]);
+
+        static::assertSame(200, $result->getStatusCode());
+        static::assertSame('linklist', (string) $result->getBody());
+        static::assertCount(1, $assignedVariables['links']);
+    }
+
+    /**
      * Test getting link list with thumbnail updates.
      *   -> 2 thumbnails update, only 1 datastore write
      */
diff --git a/tpl/default/linklist.html b/tpl/default/linklist.html
index 48cd9aad..e1115d49 100644
--- a/tpl/default/linklist.html
+++ b/tpl/default/linklist.html
@@ -129,6 +129,7 @@
       {$strAddTag=t('Add tag')}
       {$strToggleSticky=t('Toggle sticky')}
       {$strSticky=t('Sticky')}
+      {$strShaarePrivate=t('Share a private link')}
       {ignore}End of translations{/ignore}
       {loop="links"}
         <div class="anchor" id="{$value.shorturl}"></div>
@@ -241,6 +242,12 @@
                   {$strPermalinkLc}
                 </a>
 
+                {if="$is_logged_in && $value.private"}
+                  <a href="{$base_path}/admin/shaare/private/{$value.shorturl}?token={$token}" title="{$strShaarePrivate}">
+                    <i class="fa fa-share-alt"></i>
+                  </a>
+                {/if}
+
                 <div class="pure-u-0 pure-u-lg-visible">
                   {if="isset($value.link_plugin)"}
                     &middot;