TIC 3265 - option to add links to coursewares in link block and table of contents

Closes #3265

Merge request studip/studip!2646

3 files changed, 53 insertions, 4 deletions

diff --git a/lib/models/Courseware/BlockTypes/Link.json b/lib/models/Courseware/BlockTypes/Link.json
index a6b6db2..351983f 100644
--- a/lib/models/Courseware/BlockTypes/Link.json
+++ b/lib/models/Courseware/BlockTypes/Link.json
@@ -8,6 +8,9 @@
         "target": {
             "type": "string"
         },
+        "unit-target": {
+            "type": "string"
+        },
         "url": {
             "type": "string"
         },
diff --git a/lib/models/Courseware/BlockTypes/Link.php b/lib/models/Courseware/BlockTypes/Link.php
index 3282e2c..8e14079 100644
--- a/lib/models/Courseware/BlockTypes/Link.php
+++ b/lib/models/Courseware/BlockTypes/Link.php
@@ -30,8 +30,9 @@ class Link extends BlockType
     public function initialPayload(): array
     {
         return [
-            'type' => '',
+            'type' => 'external',
             'target' => '',
+            'unit-target' => '',
             'url' => '',
             'title' => '',
         ];
@@ -61,9 +62,21 @@ class Link extends BlockType
     public static function getTags(): array
     {
         return [
-            _('URL'), _('Verlinkung'), _('Webseite'), _('extern'), _('weiterleiten'),
-            _('Material'), _('Zusatz'), _('Weiterleitung'), _('intern'), _('Verweis'),
-            _('Index'), _('Hyperlink'), _('Quellenangabe'), _('Linkliste'), _('Linksammlung')
+            _('URL'),
+            _('Verlinkung'),
+            _('Webseite'),
+            _('extern'),
+            _('weiterleiten'),
+            _('Material'),
+            _('Zusatz'),
+            _('Weiterleitung'),
+            _('intern'),
+            _('Verweis'),
+            _('Index'),
+            _('Hyperlink'),
+            _('Quellenangabe'),
+            _('Linkliste'),
+            _('Linksammlung')
         ];
     }
 }
diff --git a/lib/models/Courseware/Instance.php b/lib/models/Courseware/Instance.php
index 2676a41..c9005de 100644
--- a/lib/models/Courseware/Instance.php
+++ b/lib/models/Courseware/Instance.php
@@ -585,4 +585,37 @@ class Instance
         return $data;
     }
 
+   /* 
+    *
+    *  LINKED UNITS
+    *
+    */
+    public function getLinkedUnits(): array
+    {
+        $config = $this->unit->config->getArrayCopy();
+        if (array_key_exists('linked_units', $config)) {
+            return $config['linked_units'];
+        }
+
+        return [];
+    }
+
+    public function setLinkedUnits(array $units): void
+    {
+        $this->validateLinkedUnits($units);
+        $this->unit->config['linked_units'] = $units;
+    }
+
+    public function isValidLinkedUnits($units): bool
+    {
+        return is_array($units);
+    }
+
+    private function validateLinkedUnits($units): void
+    {
+        if (!$this->isValidLinkedUnits($units)) {
+            throw new \InvalidArgumentException('Invalid linked units for courseware.');
+        }
+    }
+
 }