Support for m.login.token (#2014)

* Add GOPATH to PATH in find-lint.sh.

The user doesn't necessarily have it in PATH.

* Refactor LoginTypePassword and Type to support m.login.token and m.login.sso.

For login token:

* m.login.token will require deleting the token after completeAuth has
  generated an access token, so a cleanup function is returned by
  Type.Login.
* Allowing different login types will require parsing the /login body
  twice: first to extract the "type" and then the type-specific parsing.
  Thus, we will have to buffer the request JSON in /login, like
  UserInteractive already does.

For SSO:

* NewUserInteractive will have to also use GetAccountByLocalpart. It
  makes more sense to just pass a (narrowed-down) accountDB interface
  to it than adding more function pointers.

Code quality:

* Passing around (and down-casting) interface{} for login request types
  has drawbacks in terms of type-safety, and no inherent benefits. We
  always decode JSON anyway. Hence renaming to Type.LoginFromJSON. Code
  that directly uses LoginTypePassword with parsed data can still use
  Login.
* Removed a TODO for SSO. This is already tracked in #1297.
* httputil.UnmarshalJSON is useful because it returns a JSONResponse.

This change is intended to have no functional changes.

* Support login tokens in User API.

This adds full lifecycle functions for login tokens: create, query, delete.

* Support m.login.token in /login.

* Fixes for PR review.

* Set @matrix-org/dendrite-core as repository code owner

* Return event NID from `StoreEvent`, match PSQL vs SQLite behaviour, tweak backfill persistence (#2071)

Co-authored-by: kegsay <kegan@matrix.org>
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

clientapi/auth/login_test.go

@@ -0,0 +1,194 @@
+// Copyright 2021 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"
+	"database/sql"
+	"net/http"
+	"reflect"
+	"strings"
+	"testing"
+
+	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	"github.com/matrix-org/dendrite/setup/config"
+	uapi "github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/util"
+)
+
+func TestLoginFromJSONReader(t *testing.T) {
+	ctx := context.Background()
+
+	tsts := []struct {
+		Name string
+		Body string
+
+		WantUsername      string
+		WantDeviceID      string
+		WantDeletedTokens []string
+	}{
+		{
+			Name: "passwordWorks",
+			Body: `{
+				"type": "m.login.password",
+				"identifier": { "type": "m.id.user", "user": "alice" },
+				"password": "herpassword",
+				"device_id": "adevice"
+            }`,
+			WantUsername: "alice",
+			WantDeviceID: "adevice",
+		},
+		{
+			Name: "tokenWorks",
+			Body: `{
+				"type": "m.login.token",
+				"token": "atoken",
+				"device_id": "adevice"
+            }`,
+			WantUsername:      "@auser:example.com",
+			WantDeviceID:      "adevice",
+			WantDeletedTokens: []string{"atoken"},
+		},
+	}
+	for _, tst := range tsts {
+		t.Run(tst.Name, func(t *testing.T) {
+			var accountDB fakeAccountDB
+			var userAPI fakeUserInternalAPI
+			cfg := &config.ClientAPI{
+				Matrix: &config.Global{
+					ServerName: serverName,
+				},
+			}
+			login, cleanup, err := LoginFromJSONReader(ctx, strings.NewReader(tst.Body), &accountDB, &userAPI, cfg)
+			if err != nil {
+				t.Fatalf("LoginFromJSONReader failed: %+v", err)
+			}
+			cleanup(ctx, &util.JSONResponse{Code: http.StatusOK})
+
+			if login.Username() != tst.WantUsername {
+				t.Errorf("Username: got %q, want %q", login.Username(), tst.WantUsername)
+			}
+
+			if login.DeviceID == nil {
+				if tst.WantDeviceID != "" {
+					t.Errorf("DeviceID: got %v, want %q", login.DeviceID, tst.WantDeviceID)
+				}
+			} else {
+				if *login.DeviceID != tst.WantDeviceID {
+					t.Errorf("DeviceID: got %q, want %q", *login.DeviceID, tst.WantDeviceID)
+				}
+			}
+
+			if !reflect.DeepEqual(userAPI.DeletedTokens, tst.WantDeletedTokens) {
+				t.Errorf("DeletedTokens: got %+v, want %+v", userAPI.DeletedTokens, tst.WantDeletedTokens)
+			}
+		})
+	}
+}
+
+func TestBadLoginFromJSONReader(t *testing.T) {
+	ctx := context.Background()
+
+	tsts := []struct {
+		Name string
+		Body string
+
+		WantErrCode string
+	}{
+		{Name: "empty", WantErrCode: "M_BAD_JSON"},
+		{
+			Name:        "badUnmarshal",
+			Body:        `badsyntaxJSON`,
+			WantErrCode: "M_BAD_JSON",
+		},
+		{
+			Name: "badPassword",
+			Body: `{
+				"type": "m.login.password",
+				"identifier": { "type": "m.id.user", "user": "alice" },
+				"password": "invalidpassword",
+				"device_id": "adevice"
+            }`,
+			WantErrCode: "M_FORBIDDEN",
+		},
+		{
+			Name: "badToken",
+			Body: `{
+				"type": "m.login.token",
+				"token": "invalidtoken",
+				"device_id": "adevice"
+            }`,
+			WantErrCode: "M_FORBIDDEN",
+		},
+		{
+			Name: "badType",
+			Body: `{
+				"type": "m.login.invalid",
+				"device_id": "adevice"
+            }`,
+			WantErrCode: "M_INVALID_ARGUMENT_VALUE",
+		},
+	}
+	for _, tst := range tsts {
+		t.Run(tst.Name, func(t *testing.T) {
+			var accountDB fakeAccountDB
+			var userAPI fakeUserInternalAPI
+			cfg := &config.ClientAPI{
+				Matrix: &config.Global{
+					ServerName: serverName,
+				},
+			}
+			_, cleanup, errRes := LoginFromJSONReader(ctx, strings.NewReader(tst.Body), &accountDB, &userAPI, cfg)
+			if errRes == nil {
+				cleanup(ctx, nil)
+				t.Fatalf("LoginFromJSONReader err: got %+v, want code %q", errRes, tst.WantErrCode)
+			} else if merr, ok := errRes.JSON.(*jsonerror.MatrixError); ok && merr.ErrCode != tst.WantErrCode {
+				t.Fatalf("LoginFromJSONReader err: got %+v, want code %q", errRes, tst.WantErrCode)
+			}
+		})
+	}
+}
+
+type fakeAccountDB struct {
+	AccountDatabase
+}
+
+func (*fakeAccountDB) GetAccountByPassword(ctx context.Context, localpart, password string) (*uapi.Account, error) {
+	if password == "invalidpassword" {
+		return nil, sql.ErrNoRows
+	}
+
+	return &uapi.Account{}, nil
+}
+
+type fakeUserInternalAPI struct {
+	UserInternalAPIForLogin
+
+	DeletedTokens []string
+}
+
+func (ua *fakeUserInternalAPI) PerformLoginTokenDeletion(ctx context.Context, req *uapi.PerformLoginTokenDeletionRequest, res *uapi.PerformLoginTokenDeletionResponse) error {
+	ua.DeletedTokens = append(ua.DeletedTokens, req.Token)
+	return nil
+}
+
+func (*fakeUserInternalAPI) QueryLoginToken(ctx context.Context, req *uapi.QueryLoginTokenRequest, res *uapi.QueryLoginTokenResponse) error {
+	if req.Token == "invalidtoken" {
+		return nil
+	}
+
+	res.Data = &uapi.LoginTokenData{UserID: "@auser:example.com"}
+	return nil
+}