[Client] Add register methods

lib/src/client.dart

@@ -234,14 +234,69 @@ class Client {
     }
   }
 
+  /// Checks to see if a username is available, and valid, for the server.
+  /// You have to call [checkServer] first to set a homeserver.
+  Future<bool> usernameAvailable(String username) async {
+    final Map<String, dynamic> response = await this.jsonRequest(
+      type: HTTPType.GET,
+      action: "/client/r0/register/available?username=$username",
+    );
+    return response["available"];
+  }
+
+  /// Checks to see if a username is available, and valid, for the server.
+  /// Returns the fully-qualified Matrix user ID (MXID) that has been registered.
+  /// You have to call [checkServer] first to set a homeserver.
+  Future<Map<String, dynamic>> register({
+    String kind,
+    String username,
+    String password,
+    Map<String, dynamic> auth,
+    String deviceId,
+    String initialDeviceDisplayName,
+    bool inhibitLogin,
+  }) async {
+    final String action =
+        "/client/r0/register" + (kind != null ? "?kind=$kind" : "");
+    Map<String, dynamic> data = {};
+    if (username != null) data["username"] = username;
+    if (password != null) data["password"] = password;
+    if (auth != null) data["auth"] = auth;
+    if (deviceId != null) data["device_id"] = deviceId;
+    if (initialDeviceDisplayName != null) {
+      data["initial_device_display_name"] = initialDeviceDisplayName;
+    }
+    if (inhibitLogin != null) data["inhibit_login"] = inhibitLogin;
+    final Map<String, dynamic> response =
+        await this.jsonRequest(type: HTTPType.POST, action: action, data: data);
+
+    // Connect if there is an access token in the response.
+    if (response.containsKey("access_token") &&
+        response.containsKey("device_id") &&
+        response.containsKey("user_id")) {
+      await this.connect(
+          newToken: response["access_token"],
+          newUserID: response["user_id"],
+          newHomeserver: homeserver,
+          newDeviceName: initialDeviceDisplayName ?? "",
+          newDeviceID: response["device_id"],
+          newMatrixVersions: matrixVersions,
+          newLazyLoadMembers: lazyLoadMembers);
+    }
+    return response;
+  }
+
   /// Handles the login and allows the client to call all APIs which require
   /// authentication. Returns false if the login was not successful. Throws
   /// MatrixException if login was not successful.
-  Future<bool> login(String username, String password) async {
-    final loginResp = await jsonRequest(
-        type: HTTPType.POST,
-        action: "/client/r0/login",
-        data: {
+  /// You have to call [checkServer] first to set a homeserver.
+  Future<bool> login(
+    String username,
+    String password, {
+    String initialDeviceDisplayName,
+    String deviceId,
+  }) async {
+    Map<String, dynamic> data = {
       "type": "m.login.password",
       "user": username,
       "identifier": {
@@ -249,25 +304,30 @@ class Client {
         "user": username,
       },
       "password": password,
-          "initial_device_display_name": "Famedly Talk"
-        });
-
-    final userID = loginResp["user_id"];
-    final accessToken = loginResp["access_token"];
-    if (userID == null || accessToken == null) {
-      return false;
+    };
+    if (deviceId != null) data["device_id"] = deviceId;
+    if (initialDeviceDisplayName != null) {
+      data["initial_device_display_name"] = initialDeviceDisplayName;
     }
 
+    final loginResp = await jsonRequest(
+        type: HTTPType.POST, action: "/client/r0/login", data: data);
+
+    if (loginResp.containsKey("user_id") &&
+        loginResp.containsKey("access_token") &&
+        loginResp.containsKey("device_id")) {
       await this.connect(
-        newToken: accessToken,
-        newUserID: userID,
+          newToken: loginResp["access_token"],
+          newUserID: loginResp["user_id"],
           newHomeserver: homeserver,
-        newDeviceName: "",
-        newDeviceID: "",
+          newDeviceName: initialDeviceDisplayName ?? "",
+          newDeviceID: loginResp["device_id"],
           newMatrixVersions: matrixVersions,
           newLazyLoadMembers: lazyLoadMembers);
       return true;
     }
+    return false;
+  }
 
   /// Sends a logout command to the homeserver and clears all local data,
   /// including all persistent data from the store.

lib/src/utils/matrix_exception.dart

@@ -87,8 +87,8 @@ class MatrixException implements Exception {
     if (!raw.containsKey("flows") || !(raw["flows"] is List)) return null;
     List<AuthenticationFlow> flows = [];
     for (Map<String, dynamic> flow in raw["flows"]) {
-      if (flow["stages"] is List<String>) {
-        flows.add(AuthenticationFlow(flow["stages"]));
+      if (flow["stages"] is List) {
+        flows.add(AuthenticationFlow(List<String>.from(flow["stages"])));
       }
     }
     return flows;

test/client_test.dart

@@ -88,6 +88,18 @@ void main() {
         "initial_device_display_name": "Fluffy Matrix Client"
       });
 
+      final bool available = await matrix.usernameAvailable("testuser");
+      expect(available, true);
+
+      Map registerResponse = await matrix.register(username: "testuser");
+      expect(registerResponse["user_id"], "@testuser:example.com");
+      registerResponse =
+          await matrix.register(username: "testuser", kind: "user");
+      expect(registerResponse["user_id"], "@testuser:example.com");
+      registerResponse =
+          await matrix.register(username: "testuser", kind: "guest");
+      expect(registerResponse["user_id"], "@testuser:example.com");
+
       Future<LoginState> loginStateFuture =
           matrix.onLoginStateChanged.stream.first;
       Future<bool> firstSyncFuture = matrix.onFirstSync.stream.first;

test/fake_matrix_api.dart

@@ -756,8 +756,15 @@ class FakeMatrixApi extends MockClient {
           (var req) => archiveSyncResponse,
       "/client/r0/sync?filter=%7B%22room%22:%7B%22state%22:%7B%22lazy_load_members%22:true%7D%7D%7D":
           (var req) => syncResponse,
+      "/client/r0/register/available?username=testuser": (var req) =>
+          {"available": true},
     },
     "POST": {
+      "/client/r0/register": (var req) => {"user_id": "@testuser:example.com"},
+      "/client/r0/register?kind=user": (var req) =>
+          {"user_id": "@testuser:example.com"},
+      "/client/r0/register?kind=guest": (var req) =>
+          {"user_id": "@testuser:example.com"},
       "/client/r0/user/@test:fakeServer.notExisting/openid/request_token":
           (var req) => {
                 "access_token": "SomeT0kenHere",