Appservice Login (2nd attempt)

clientapi/auth/login.go

@@ -15,7 +15,6 @@
 package auth
 
 import (
-	"context"
 	"encoding/json"
 	"io"
 	"net/http"
@@ -32,8 +31,13 @@ import (
 // called after authorization has completed, with the result of the authorization.
 // If the final return value is non-nil, an error occurred and the cleanup function
 // is nil.
-func LoginFromJSONReader(ctx context.Context, r io.Reader, useraccountAPI uapi.UserLoginAPI, userAPI UserInternalAPIForLogin, cfg *config.ClientAPI) (*Login, LoginCleanupFunc, *util.JSONResponse) {
-	reqBytes, err := io.ReadAll(r)
+func LoginFromJSONReader(
+	req *http.Request,
+	useraccountAPI uapi.UserLoginAPI,
+	userAPI UserInternalAPIForLogin,
+	cfg *config.ClientAPI,
+) (*Login, LoginCleanupFunc, *util.JSONResponse) {
+	reqBytes, err := io.ReadAll(req.Body)
 	if err != nil {
 		err := &util.JSONResponse{
 			Code: http.StatusBadRequest,
@@ -65,6 +69,20 @@ func LoginFromJSONReader(ctx context.Context, r io.Reader, useraccountAPI uapi.U
 			UserAPI: userAPI,
 			Config:  cfg,
 		}
+	case authtypes.LoginTypeApplicationService:
+		token, err := ExtractAccessToken(req)
+		if err != nil {
+			err := &util.JSONResponse{
+				Code: http.StatusForbidden,
+				JSON: spec.MissingToken(err.Error()),
+			}
+			return nil, nil, err
+		}
+
+		typ = &LoginTypeApplicationService{
+			Config: cfg,
+			Token:  token,
+		}
 	default:
 		err := util.JSONResponse{
 			Code: http.StatusBadRequest,
@@ -73,7 +91,7 @@ func LoginFromJSONReader(ctx context.Context, r io.Reader, useraccountAPI uapi.U
 		return nil, nil, &err
 	}
 
-	return typ.LoginFromJSON(ctx, reqBytes)
+	return typ.LoginFromJSON(req.Context(), reqBytes)
 }
 
 // UserInternalAPIForLogin contains the aspects of UserAPI required for logging in.

clientapi/auth/login_application_service.go

@@ -0,0 +1,55 @@
+// Copyright 2023 The Matrix.org Foundation C.I.C.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package auth
+
+import (
+	"context"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
+	"github.com/matrix-org/dendrite/clientapi/httputil"
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/util"
+)
+
+// LoginTypeApplicationService describes how to authenticate as an
+// application service
+type LoginTypeApplicationService struct {
+	Config *config.ClientAPI
+	Token  string
+}
+
+// Name implements Type
+func (t *LoginTypeApplicationService) Name() string {
+	return authtypes.LoginTypeApplicationService
+}
+
+// LoginFromJSON implements Type
+func (t *LoginTypeApplicationService) LoginFromJSON(
+	ctx context.Context, reqBytes []byte,
+) (*Login, LoginCleanupFunc, *util.JSONResponse) {
+	var r Login
+	if err := httputil.UnmarshalJSON(reqBytes, &r); err != nil {
+		return nil, nil, err
+	}
+
+	_, err := internal.ValidateApplicationServiceRequest(t.Config, r.Identifier.User, t.Token)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	cleanup := func(ctx context.Context, j *util.JSONResponse) {}
+	return &r, cleanup, nil
+}

clientapi/auth/login_test.go

@@ -17,7 +17,9 @@ package auth
 import (
 	"context"
 	"net/http"
+	"net/http/httptest"
 	"reflect"
+	"regexp"
 	"strings"
 	"testing"
 
@@ -33,8 +35,9 @@ func TestLoginFromJSONReader(t *testing.T) {
 	ctx := context.Background()
 
 	tsts := []struct {
-		Name string
-		Body string
+		Name  string
+		Body  string
+		Token string
 
 		WantUsername      string
 		WantDeviceID      string
@@ -62,6 +65,30 @@ func TestLoginFromJSONReader(t *testing.T) {
 			WantDeviceID:      "adevice",
 			WantDeletedTokens: []string{"atoken"},
 		},
+		{
+			Name: "appServiceWorksUserID",
+			Body: `{
+				"type": "m.login.application_service",
+				"identifier": { "type": "m.id.user", "user": "@alice:example.com" },
+				"device_id": "adevice"
+			}`,
+			Token: "astoken",
+
+			WantUsername: "@alice:example.com",
+			WantDeviceID: "adevice",
+		},
+		{
+			Name: "appServiceWorksLocalpart",
+			Body: `{
+				"type": "m.login.application_service",
+				"identifier": { "type": "m.id.user", "user": "alice" },
+				"device_id": "adevice"
+			}`,
+			Token: "astoken",
+
+			WantUsername: "alice",
+			WantDeviceID: "adevice",
+		},
 	}
 	for _, tst := range tsts {
 		t.Run(tst.Name, func(t *testing.T) {
@@ -72,11 +99,35 @@ func TestLoginFromJSONReader(t *testing.T) {
 						ServerName: serverName,
 					},
 				},
+				Derived: &config.Derived{
+					ApplicationServices: []config.ApplicationService{
+						{
+							ID:      "anapplicationservice",
+							ASToken: "astoken",
+							NamespaceMap: map[string][]config.ApplicationServiceNamespace{
+								"users": {
+									{
+										Exclusive:    true,
+										Regex:        "@alice:example.com",
+										RegexpObject: regexp.MustCompile("@alice:example.com"),
+									},
+								},
+							},
+						},
+					},
+				},
 			}
-			login, cleanup, err := LoginFromJSONReader(ctx, strings.NewReader(tst.Body), &userAPI, &userAPI, cfg)
-			if err != nil {
-				t.Fatalf("LoginFromJSONReader failed: %+v", err)
+
+			req := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(tst.Body))
+			if tst.Token != "" {
+				req.Header.Add("Authorization", "Bearer "+tst.Token)
 			}
+
+			login, cleanup, jsonErr := LoginFromJSONReader(req, &userAPI, &userAPI, cfg)
+			if jsonErr != nil {
+				t.Fatalf("LoginFromJSONReader failed: %+v", jsonErr)
+			}
+
 			cleanup(ctx, &util.JSONResponse{Code: http.StatusOK})
 
 			if login.Username() != tst.WantUsername {
@@ -104,8 +155,9 @@ func TestBadLoginFromJSONReader(t *testing.T) {
 	ctx := context.Background()
 
 	tsts := []struct {
-		Name string
-		Body string
+		Name  string
+		Body  string
+		Token string
 
 		WantErrCode spec.MatrixErrorCode
 	}{
@@ -142,6 +194,45 @@ func TestBadLoginFromJSONReader(t *testing.T) {
             }`,
 			WantErrCode: spec.ErrorInvalidParam,
 		},
+		{
+			Name: "noASToken",
+			Body: `{
+				"type": "m.login.application_service",
+				"identifier": { "type": "m.id.user", "user": "@alice:example.com" },
+				"device_id": "adevice"
+			}`,
+			WantErrCode: "M_MISSING_TOKEN",
+		},
+		{
+			Name:  "badASToken",
+			Token: "badastoken",
+			Body: `{
+				"type": "m.login.application_service",
+				"identifier": { "type": "m.id.user", "user": "@alice:example.com" },
+				"device_id": "adevice"
+			}`,
+			WantErrCode: "M_UNKNOWN_TOKEN",
+		},
+		{
+			Name:  "badASNamespace",
+			Token: "astoken",
+			Body: `{
+				"type": "m.login.application_service",
+				"identifier": { "type": "m.id.user", "user": "@bob:example.com" },
+				"device_id": "adevice"
+			}`,
+			WantErrCode: "M_EXCLUSIVE",
+		},
+		{
+			Name:  "badASUserID",
+			Token: "astoken",
+			Body: `{
+				"type": "m.login.application_service",
+				"identifier": { "type": "m.id.user", "user": "@alice:wrong.example.com" },
+				"device_id": "adevice"
+			}`,
+			WantErrCode: "M_INVALID_USERNAME",
+		},
 	}
 	for _, tst := range tsts {
 		t.Run(tst.Name, func(t *testing.T) {
@@ -152,8 +243,30 @@ func TestBadLoginFromJSONReader(t *testing.T) {
 						ServerName: serverName,
 					},
 				},
+				Derived: &config.Derived{
+					ApplicationServices: []config.ApplicationService{
+						{
+							ID:      "anapplicationservice",
+							ASToken: "astoken",
+							NamespaceMap: map[string][]config.ApplicationServiceNamespace{
+								"users": {
+									{
+										Exclusive:    true,
+										Regex:        "@alice:example.com",
+										RegexpObject: regexp.MustCompile("@alice:example.com"),
+									},
+								},
+							},
+						},
+					},
+				},
 			}
-			_, cleanup, errRes := LoginFromJSONReader(ctx, strings.NewReader(tst.Body), &userAPI, &userAPI, cfg)
+			req := httptest.NewRequest(http.MethodPost, "/", strings.NewReader(tst.Body))
+			if tst.Token != "" {
+				req.Header.Add("Authorization", "Bearer "+tst.Token)
+			}
+
+			_, cleanup, errRes := LoginFromJSONReader(req, &userAPI, &userAPI, cfg)
 			if errRes == nil {
 				cleanup(ctx, nil)
 				t.Fatalf("LoginFromJSONReader err: got %+v, want code %q", errRes, tst.WantErrCode)

clientapi/auth/user_interactive.go

@@ -55,7 +55,7 @@ type LoginCleanupFunc func(context.Context, *util.JSONResponse)
 // https://matrix.org/docs/spec/client_server/r0.6.1#identifier-types
 type LoginIdentifier struct {
 	Type string `json:"type"`
-	// when type = m.id.user
+	// when type = m.id.user or m.id.application_service
 	User string `json:"user"`
 	// when type = m.id.thirdparty
 	Medium  string `json:"medium"`

clientapi/routing/login.go

@@ -19,6 +19,7 @@ import (
 	"net/http"
 
 	"github.com/matrix-org/dendrite/clientapi/auth"
+	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 	"github.com/matrix-org/dendrite/clientapi/userutil"
 	"github.com/matrix-org/dendrite/setup/config"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
@@ -40,28 +41,24 @@ type flow struct {
 	Type string `json:"type"`
 }
 
-func passwordLogin() flows {
-	f := flows{}
-	s := flow{
-		Type: "m.login.password",
-	}
-	f.Flows = append(f.Flows, s)
-	return f
-}
-
 // Login implements GET and POST /login
 func Login(
 	req *http.Request, userAPI userapi.ClientUserAPI,
 	cfg *config.ClientAPI,
 ) util.JSONResponse {
 	if req.Method == http.MethodGet {
-		// TODO: support other forms of login other than password, depending on config options
+		// TODO: support other forms of login, depending on config options
 		return util.JSONResponse{
 			Code: http.StatusOK,
-			JSON: passwordLogin(),
+			JSON: flows{
+				Flows: []flow{
+					{Type: authtypes.LoginTypePassword},
+					{Type: authtypes.LoginTypeApplicationService},
+				},
+			},
 		}
 	} else if req.Method == http.MethodPost {
-		login, cleanup, authErr := auth.LoginFromJSONReader(req.Context(), req.Body, userAPI, userAPI, cfg)
+		login, cleanup, authErr := auth.LoginFromJSONReader(req, userAPI, userAPI, cfg)
 		if authErr != nil {
 			return *authErr
 		}

clientapi/routing/login_test.go

@@ -113,6 +113,39 @@ func TestLogin(t *testing.T) {
 
 		ctx := context.Background()
 
+		t.Run("Supported log-in flows are returned", func(t *testing.T) {
+			req := test.NewRequest(t, http.MethodGet, "/_matrix/client/v3/login")
+			rec := httptest.NewRecorder()
+			routers.Client.ServeHTTP(rec, req)
+			if rec.Code != http.StatusOK {
+				t.Fatalf("failed to get log-in flows: %s", rec.Body.String())
+			}
+
+			t.Logf("response: %s", rec.Body.String())
+			resp := flows{}
+			if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+				t.Fatal(err)
+			}
+
+			appServiceFound := false
+			passwordFound := false
+			for _, flow := range resp.Flows {
+				if flow.Type == "m.login.password" {
+					passwordFound = true
+				} else if flow.Type == "m.login.application_service" {
+					appServiceFound = true
+				} else {
+					t.Fatalf("got unknown login flow: %s", flow.Type)
+				}
+			}
+			if !appServiceFound {
+				t.Fatal("m.login.application_service missing from login flows")
+			}
+			if !passwordFound {
+				t.Fatal("m.login.password missing from login flows")
+			}
+		})
+
 		for _, tc := range testCases {
 			t.Run(tc.name, func(t *testing.T) {
 				req := test.NewRequest(t, http.MethodPost, "/_matrix/client/v3/login", test.WithJSONBody(t, map[string]interface{}{