feat: Add samples for Chat search messages API (#660)

Author: gtondello

advanced/chat.gs

@@ -120,3 +120,45 @@ function listMemberships(spaceName) {
   }
 }
 // [END chat_list_memberships]
+
+// [START chat_search_messages]
+/**
+ * Searches for unread messages for the caller user in all Chat spaces.
+ */
+function searchMessages() {
+  let response;
+  let pageToken = null;
+  try {
+    do {
+      response = Chat.Spaces.Messages.search(
+        {
+          filter: 'is_unread()'
+        },
+        'spaces/-',
+        {
+          pageSize: 10,
+          pageToken: pageToken,
+        }
+      );
+      if (!response.results || response.results.length === 0) {
+        pageToken = response.nextPageToken;
+        continue;
+      }
+      for (const result of response.results) {
+        const message = result.message;
+        console.log(
+          "**%s at %s in %s:**\n%s",
+          message.sender.name,
+          message.createTime,
+          message.space.name,
+          message.text,
+        );
+      }
+      pageToken = response.nextPageToken;
+    } while (pageToken);
+  } catch (err) {
+    // TODO (developer) - Handle exception
+    console.log("Failed with error %s", err.message);
+  }
+}
+// [END chat_search_messages]

chat/advanced-service/Main.gs

@@ -771,6 +771,46 @@ function listSpacesUserCred() {
 }
 // [END chat_list_spaces_user_cred]
 
+// [START chat_search_messages_user_cred]
+/**
+ * This sample shows how to search messages with user credential
+ *
+ * It relies on the OAuth2 scope 'https://www.googleapis.com/auth/chat.messages.readonly'
+ * referenced in the manifest file (appsscript.json).
+ */
+function searchMessagesUserCred() {
+  // Initialize request argument(s)
+  // TODO(developer): Replace FILTER here with an actual filter query
+  const filter = "FILTER";
+  const parent = "spaces/-";
+
+  // Iterate through the response pages using page tokens
+  let responsePage;
+  let pageToken = null;
+  do {
+    // Request response pages
+    responsePage = Chat.Spaces.Messages.search(
+      {
+        filter: filter,
+      },
+      parent,
+      {
+        pageSize: 10,
+        pageToken: pageToken,
+      }
+    );
+    // Handle response pages
+    if (responsePage.results) {
+      for (const result of responsePage.results) {
+        console.log(result);
+      }
+    }
+    // Update the page token to the next one
+    pageToken = responsePage.nextPageToken;
+  } while (pageToken);
+}
+// [END chat_search_messages_user_cred]
+
 // [START chat_set_up_space_user_cred]
 /**
  * This sample shows how to set up a named space with one initial member with