1 files changed, 45 insertions, 0 deletions
diff --git a/matrix-specification/UserIdentifier.php b/matrix-specification/UserIdentifier.php
new file mode 100644
index 0000000..63f939a
--- /dev/null
+++ b/matrix-specification/UserIdentifier.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace Matrix;
+
+use Matrix\Enums\UserIdentifierType;
+
+class UserIdentifier implements \JsonSerializable
+{
+  public function __construct(
+    private UserIdentifierType $type,
+    private ?string $user = null,
+    private ?string $thirdPartyMedium = null,
+    private ?string $thirdPartyAddress = null,
+    private ?string $phoneCountry = null,
+    private ?string $phoneNumber = null,
+  )
+  {}
+
+  public function jsonSerialize(): array
+  {
+    $userIdentifier = [
+      "type" => $this->type,
+    ];
+
+    $userIdentifier += match ($this->type) {
+      UserIdentifierType::USER => [
+        "user" => $this->user,
+      ],
+
+      UserIdentifierType::THIRDPARTY => [
+        "medium" => $this->thirdPartyMedium,
+        "address" => $this->thirdPartyAddress,
+      ],
+
+      UserIdentifierType::PHONE => [
+        "country" => $this->phoneCountry,
+        "phone" => $this->phoneNumber,
+      ],
+
+      default => [],
+    };
+
+    return $userIdentifier;
+  }
+}