Add the preferences API for apps and users

src/Id/Resources/Preferences.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace Anikeen\Id\Resources;
+
+/**
+ * The preferences of a user in one namespace, sorted by key (at most 50, no pagination).
+ */
+class Preferences extends BaseCollection
+{
+    /**
+     * The preference of a key; null when it isn't set. Reads the list, no request.
+     */
+    public function find(string $id): ?Preference
+    {
+        $data = $this->item($id);
+
+        if ($data === null) {
+            return null;
+        }
+
+        $result = clone $this->result;
+        $result->data = $data;
+
+        return new Preference(fn () => $result);
+    }
+
+    /**
+     * The value of a key, or $default when it isn't set.
+     */
+    public function get(string $key, mixed $default = null): mixed
+    {
+        $data = $this->item($key);
+
+        return $data !== null ? $data->value : $default;
+    }
+
+    public function has(string $key): bool
+    {
+        return $this->item($key) !== null;
+    }
+
+    /**
+     * The values by key.
+     *
+     * @return array<string, mixed>
+     */
+    public function values(): array
+    {
+        $values = [];
+
+        foreach ((array) $this->result->data as $data) {
+            $values[$data->key] = $data->value;
+        }
+
+        return $values;
+    }
+
+    private function item(string $key): ?object
+    {
+        foreach ((array) $this->result->data as $data) {
+            if (($data->key ?? null) === $key) {
+                return $data;
+            }
+        }
+
+        return null;
+    }
+}