feat: add rich link annotation type

PiperOrigin-RevId: 615897483

google/chat/v1/annotation.proto

@@ -16,6 +16,7 @@ syntax = "proto3";
 
 package google.chat.v1;
 
+import "google/chat/v1/attachment.proto";
 import "google/chat/v1/user.proto";
 
 option csharp_namespace = "Google.Apps.Chat.V1";
@@ -72,6 +73,9 @@ message Annotation {
 
     // The metadata for a slash command.
     SlashCommandMetadata slash_command = 5;
+
+    // The metadata for a rich link.
+    RichLinkMetadata rich_link_metadata = 6;
   }
 }
 
@@ -124,6 +128,41 @@ message SlashCommandMetadata {
   bool triggers_dialog = 5;
 }
 
+// A rich link to a resource.
+message RichLinkMetadata {
+  // The rich link type. More types might be added in the future.
+  enum RichLinkType {
+    // Default value for the enum. Don't use.
+    RICH_LINK_TYPE_UNSPECIFIED = 0;
+
+    // A Google Drive rich link type.
+    DRIVE_FILE = 1;
+  }
+
+  // The URI of this link.
+  string uri = 1;
+
+  // The rich link type.
+  RichLinkType rich_link_type = 2;
+
+  // Data for the linked resource.
+  oneof data {
+    // Data for a drive link.
+    DriveLinkData drive_link_data = 3;
+  }
+}
+
+// Data for Google Drive links.
+message DriveLinkData {
+  // A
+  // [DriveDataRef](https://developers.google.com/chat/api/reference/rest/v1/spaces.messages.attachments#drivedataref)
+  // which references a Google Drive file.
+  DriveDataRef drive_data_ref = 1;
+
+  // The mime type of the linked Google Drive resource.
+  string mime_type = 2;
+}
+
 // Type of the annotation.
 enum AnnotationType {
   // Default value for the enum. Don't use.
@@ -134,4 +173,7 @@ enum AnnotationType {
 
   // A slash command is invoked.
   SLASH_COMMAND = 2;
+
+  // A rich link annotation.
+  RICH_LINK = 3;
 }