Add bare bones user API (#1127)

* Add bare bones user API

with tests!

* linting

6 files changed, 373 insertions, 0 deletions

diff --git a/userapi/api/api.go b/userapi/api/api.go
new file mode 100644
index 00000000..8534fb17
--- /dev/null
+++ b/userapi/api/api.go
@@ -0,0 +1,38 @@
+// Copyright 2020 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 api
+
+import "context"
+
+// UserInternalAPI is the internal API for information about users and devices.
+type UserInternalAPI interface {
+	QueryProfile(ctx context.Context, req *QueryProfileRequest, res *QueryProfileResponse) error
+}
+
+// QueryProfileRequest is the request for QueryProfile
+type QueryProfileRequest struct {
+	// The user ID to query
+	UserID string
+}
+
+// QueryProfileResponse is the response for QueryProfile
+type QueryProfileResponse struct {
+	// True if the user has been created. Querying for a profile does not create them.
+	UserExists bool
+	// The current display name if set.
+	DisplayName string
+	// The current avatar URL if set.
+	AvatarURL string
+}
diff --git a/userapi/internal/api.go b/userapi/internal/api.go
new file mode 100644
index 00000000..0144526c
--- /dev/null
+++ b/userapi/internal/api.go
@@ -0,0 +1,53 @@
+// Copyright 2020 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 internal
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type UserInternalAPI struct {
+	AccountDB  accounts.Database
+	DeviceDB   devices.Database
+	ServerName gomatrixserverlib.ServerName
+}
+
+func (a *UserInternalAPI) QueryProfile(ctx context.Context, req *api.QueryProfileRequest, res *api.QueryProfileResponse) error {
+	local, domain, err := gomatrixserverlib.SplitID('@', req.UserID)
+	if err != nil {
+		return err
+	}
+	if domain != a.ServerName {
+		return fmt.Errorf("cannot query profile of remote users: got %s want %s", domain, a.ServerName)
+	}
+	prof, err := a.AccountDB.GetProfileByLocalpart(ctx, local)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil
+		}
+		return err
+	}
+	res.UserExists = true
+	res.AvatarURL = prof.AvatarURL
+	res.DisplayName = prof.DisplayName
+	return nil
+}
diff --git a/userapi/inthttp/client.go b/userapi/inthttp/client.go
new file mode 100644
index 00000000..90cc54a4
--- /dev/null
+++ b/userapi/inthttp/client.go
@@ -0,0 +1,62 @@
+// Copyright 2020 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 inthttp
+
+import (
+	"context"
+	"errors"
+	"net/http"
+
+	"github.com/matrix-org/dendrite/internal/httputil"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/opentracing/opentracing-go"
+)
+
+// HTTP paths for the internal HTTP APIs
+const (
+	QueryProfilePath = "/userapi/queryProfile"
+)
+
+// NewUserAPIClient creates a UserInternalAPI implemented by talking to a HTTP POST API.
+// If httpClient is nil an error is returned
+func NewUserAPIClient(
+	apiURL string,
+	httpClient *http.Client,
+) (api.UserInternalAPI, error) {
+	if httpClient == nil {
+		return nil, errors.New("NewUserAPIClient: httpClient is <nil>")
+	}
+	return &httpUserInternalAPI{
+		apiURL:     apiURL,
+		httpClient: httpClient,
+	}, nil
+}
+
+type httpUserInternalAPI struct {
+	apiURL     string
+	httpClient *http.Client
+}
+
+func (h *httpUserInternalAPI) QueryProfile(
+	ctx context.Context,
+	request *api.QueryProfileRequest,
+	response *api.QueryProfileResponse,
+) error {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "QueryProfile")
+	defer span.Finish()
+
+	apiURL := h.apiURL + QueryProfilePath
+	return httputil.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
+}
diff --git a/userapi/inthttp/server.go b/userapi/inthttp/server.go
new file mode 100644
index 00000000..f3c17ccd
--- /dev/null
+++ b/userapi/inthttp/server.go
@@ -0,0 +1,41 @@
+// Copyright 2020 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 inthttp
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	"github.com/matrix-org/dendrite/internal/httputil"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/util"
+)
+
+func AddRoutes(internalAPIMux *mux.Router, s api.UserInternalAPI) {
+	internalAPIMux.Handle(QueryProfilePath,
+		httputil.MakeInternalAPI("queryProfile", func(req *http.Request) util.JSONResponse {
+			request := api.QueryProfileRequest{}
+			response := api.QueryProfileResponse{}
+			if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
+				return util.MessageResponse(http.StatusBadRequest, err.Error())
+			}
+			if err := s.QueryProfile(req.Context(), &request, &response); err != nil {
+				return util.ErrorResponse(err)
+			}
+			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
+		}),
+	)
+}
diff --git a/userapi/userapi.go b/userapi/userapi.go
new file mode 100644
index 00000000..32f851cc
--- /dev/null
+++ b/userapi/userapi.go
@@ -0,0 +1,41 @@
+// Copyright 2020 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 userapi
+
+import (
+	"github.com/gorilla/mux"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/dendrite/userapi/internal"
+	"github.com/matrix-org/dendrite/userapi/inthttp"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// AddInternalRoutes registers HTTP handlers for the internal API. Invokes functions
+// on the given input API.
+func AddInternalRoutes(router *mux.Router, intAPI api.UserInternalAPI) {
+	inthttp.AddRoutes(router, intAPI)
+}
+
+// NewInternalAPI returns a concerete implementation of the internal API. Callers
+// can call functions directly on the returned API or via an HTTP interface using AddInternalRoutes.
+func NewInternalAPI(accountDB accounts.Database, deviceDB devices.Database, serverName gomatrixserverlib.ServerName) api.UserInternalAPI {
+	return &internal.UserInternalAPI{
+		AccountDB:  accountDB,
+		DeviceDB:   deviceDB,
+		ServerName: serverName,
+	}
+}
diff --git a/userapi/userapi_test.go b/userapi/userapi_test.go
new file mode 100644
index 00000000..423a8612
--- /dev/null
+++ b/userapi/userapi_test.go
@@ -0,0 +1,138 @@
+package userapi_test
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/http"
+	"reflect"
+	"sync"
+	"testing"
+
+	"github.com/gorilla/mux"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices"
+	"github.com/matrix-org/dendrite/internal/httputil"
+	"github.com/matrix-org/dendrite/userapi"
+	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/dendrite/userapi/inthttp"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const (
+	serverName = gomatrixserverlib.ServerName("example.com")
+)
+
+func MustMakeInternalAPI(t *testing.T) (api.UserInternalAPI, accounts.Database, devices.Database) {
+	accountDB, err := accounts.NewDatabase("file::memory:", nil, serverName)
+	if err != nil {
+		t.Fatalf("failed to create account DB: %s", err)
+	}
+	deviceDB, err := devices.NewDatabase("file::memory:", nil, serverName)
+	if err != nil {
+		t.Fatalf("failed to create device DB: %s", err)
+	}
+
+	return userapi.NewInternalAPI(accountDB, deviceDB, serverName), accountDB, deviceDB
+}
+
+func TestQueryProfile(t *testing.T) {
+	aliceAvatarURL := "mxc://example.com/alice"
+	aliceDisplayName := "Alice"
+	userAPI, accountDB, _ := MustMakeInternalAPI(t)
+	_, err := accountDB.CreateAccount(context.TODO(), "alice", "foobar", "")
+	if err != nil {
+		t.Fatalf("failed to make account: %s", err)
+	}
+	if err := accountDB.SetAvatarURL(context.TODO(), "alice", aliceAvatarURL); err != nil {
+		t.Fatalf("failed to set avatar url: %s", err)
+	}
+	if err := accountDB.SetDisplayName(context.TODO(), "alice", aliceDisplayName); err != nil {
+		t.Fatalf("failed to set display name: %s", err)
+	}
+
+	testCases := []struct {
+		req     api.QueryProfileRequest
+		wantRes api.QueryProfileResponse
+		wantErr error
+	}{
+		{
+			req: api.QueryProfileRequest{
+				UserID: fmt.Sprintf("@alice:%s", serverName),
+			},
+			wantRes: api.QueryProfileResponse{
+				UserExists:  true,
+				AvatarURL:   aliceAvatarURL,
+				DisplayName: aliceDisplayName,
+			},
+		},
+		{
+			req: api.QueryProfileRequest{
+				UserID: fmt.Sprintf("@bob:%s", serverName),
+			},
+			wantRes: api.QueryProfileResponse{
+				UserExists: false,
+			},
+		},
+		{
+			req: api.QueryProfileRequest{
+				UserID: "@alice:wrongdomain.com",
+			},
+			wantErr: fmt.Errorf("wrong domain"),
+		},
+	}
+
+	runCases := func(testAPI api.UserInternalAPI) {
+		for _, tc := range testCases {
+			var gotRes api.QueryProfileResponse
+			gotErr := testAPI.QueryProfile(context.TODO(), &tc.req, &gotRes)
+			if tc.wantErr == nil && gotErr != nil || tc.wantErr != nil && gotErr == nil {
+				t.Errorf("QueryProfile error, got %s want %s", gotErr, tc.wantErr)
+				continue
+			}
+			if !reflect.DeepEqual(tc.wantRes, gotRes) {
+				t.Errorf("QueryProfile response got %+v want %+v", gotRes, tc.wantRes)
+			}
+		}
+	}
+
+	t.Run("HTTP API", func(t *testing.T) {
+		router := mux.NewRouter().PathPrefix(httputil.InternalPathPrefix).Subrouter()
+		userapi.AddInternalRoutes(router, userAPI)
+		apiURL, cancel := listenAndServe(t, router)
+		defer cancel()
+		httpAPI, err := inthttp.NewUserAPIClient(apiURL, &http.Client{})
+		if err != nil {
+			t.Fatalf("failed to create HTTP client")
+		}
+		runCases(httpAPI)
+	})
+	t.Run("Monolith", func(t *testing.T) {
+		runCases(userAPI)
+	})
+}
+
+func listenAndServe(t *testing.T, router *mux.Router) (apiURL string, cancel func()) {
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		t.Fatalf("failed to listen: %s", err)
+	}
+	port := listener.Addr().(*net.TCPAddr).Port
+	srv := http.Server{}
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		srv.Handler = router
+		err := srv.Serve(listener)
+		if err != nil && err != http.ErrServerClosed {
+			t.Logf("Listen failed: %s", err)
+		}
+	}()
+
+	return fmt.Sprintf("http://localhost:%d", port), func() {
+		srv.Shutdown(context.Background())
+		wg.Wait()
+	}
+}