link previews

1 files changed, 44 insertions, 1 deletions

diff --git a/Digitigrade/Model/Note.php b/Digitigrade/Model/Note.php
index d5d4e69..ac9cc3c 100644
--- a/Digitigrade/Model/Note.php
+++ b/Digitigrade/Model/Note.php
@@ -4,12 +4,16 @@ namespace Digitigrade\Model;
 use Digitigrade\Db;
 use Digitigrade\FormattingProvider\CommonMark;
 use Digitigrade\FormattingProvider\SanitisedHtml;
+use Digitigrade\LinkPreview;
 use Digitigrade\Model\HomeTimelineItem;
 use Digitigrade\Notification\Notifyable;
 use Digitigrade\Timeline\TimelineIncludeable;
 use Digitigrade\Timeline\TimelineItem;
+use JsonMapper;
 
 class Note extends PushableModel implements TimelineIncludeable, Notifyable {
+    public const EXTENSION_LINK_PREVIEWS = 'https://pawpub.entities.org.uk/extension/link-previews';
+
     public ?int $id;
     public string $uri;
     public \DateTimeImmutable $created;
@@ -265,6 +269,45 @@ class Note extends PushableModel implements TimelineIncludeable, Notifyable {
         return htmlspecialchars($this->plainContent);
     }
 
+    /**
+     * Gets a list of LinkPreviews applicable to this note
+     * @return LinkPreview[]
+     */
+    public function getLinkPreviews(): array {
+        if (($this->extensions[self::EXTENSION_LINK_PREVIEWS] ?? []) == []) {
+            return [];
+        }
+        $mapper = new JsonMapper();
+        $results = [];
+        foreach ($this->extensions[self::EXTENSION_LINK_PREVIEWS] as $preview) {
+            $results[] = $mapper->map($preview, LinkPreview::class);
+        }
+        return $results;
+    }
+
+    /**
+     * Generates new LinkPreviews for this note (but does not save them automatically)
+     * @return LinkPreview[] the new link previews
+     */
+    public function generateLinkPreviews(): array {
+        $matches = [];
+        preg_match_all(
+            '`[a-z+]+://[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b(([-a-zA-Z0-9@:(%_\+.~#?&/=]|\)[^\s])*)`',
+            $this->getFormattedContent('text/markdown') ?? $this->plainContent,
+            $matches
+        );
+        $urls = $matches[0] ?? [];
+        $previews = array_filter(
+            array_map(fn($url) => LinkPreview::generate($url), $urls),
+            fn($p) => $p != null
+        );
+        $this->extensions[self::EXTENSION_LINK_PREVIEWS] = array_map(
+            fn($p) => json_decode(json_encode($p)),
+            $previews
+        );
+        return $previews;
+    }
+
     public function renderAsHtml() {
         render_template('note', ['note' => $this]);
     }
@@ -345,7 +388,7 @@ class Note extends PushableModel implements TimelineIncludeable, Notifyable {
                     'description' => $attachment->description
                 ];
             }, $this->attachments),
-            //'extensions' => []
+            'extensions' => $this->extensions
         ];
     }
 }
\ No newline at end of file