feat: content schema with registered and sampled meta fields

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7
2026-09-25 22:04:04 +02:00
parent 261972751f
commit b3f4b7ba65
9 changed files with 600 additions and 0 deletions
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\WordPress\Schema;
+
+/**
+ * Meta keys actually used by the most recent posts of a type. Keys starting with
+ * "_" are internal and only shown when another source knows them.
+ */
+final class SampledMetaSource extends MetaFieldSource
+{
+    private const SAMPLE_POSTS = 50;
+    private const MAX_KEYS = 200;
+
+    public function __construct(private ?\wpdb $db = null)
+    {
+    }
+
+    public function id(): string
+    {
+        return 'sample';
+    }
+
+    public function fieldsFor(string $postType): array
+    {
+        $wpdb = $this->db ?? $GLOBALS['wpdb'];
+        // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- only core table names interpolated.
+        $keys = $wpdb->get_col($wpdb->prepare(
+            "SELECT DISTINCT pm.meta_key FROM {$wpdb->postmeta} pm
+             INNER JOIN (
+                SELECT ID FROM {$wpdb->posts}
+                WHERE post_type = %s AND post_status NOT IN ('auto-draft', 'trash')
+                ORDER BY ID DESC LIMIT %d
+             ) recent ON recent.ID = pm.post_id
+             ORDER BY pm.meta_key LIMIT %d",
+            $postType,
+            self::SAMPLE_POSTS,
+            self::MAX_KEYS
+        ));
+
+        $fields = [];
+        foreach ((array) $keys as $key) {
+            $key = (string) $key;
+            if ($key === '' || str_starts_with($key, '_')) {
+                continue;
+            }
+
+            $fields[] = new FieldDefinition($key, $key, 'unknown', 'sample', FieldDefinition::UNKNOWN);
+        }
+
+        return $fields;
+    }
+}