Test the scope of a transaction IDs

This adds two tests, which check the current spec behaviour of
transaction IDs, which are that they are scoped to a series of access
tokens, and not the device ID.

The first test highlight this behaviour, by logging in with refresh
token enabled, sending an event, using the refresh token and syncing
with the new access token. On the sync, the transaction ID should be
there, but currently in Synapse it is not.

The second test highlight that the transaction ID is not scoped to the
device ID, by logging in twice with the same device ID, sending an event
with the first access token, and syncing with the second access token.
In that case, the sync should not contain the transaction ID, but
I think it's the case in HS implementations which use the device ID to
scope the transaction IDs, like Conduit.

Related: matrix-org/matrix-spec#1133, matrix-org/matrix-spec#1236, matrix-org/synapse#13064 and matrix-org/synapse#13083

internal/client/client.go

@@ -438,7 +438,81 @@ func (c *CSAPI) LoginUser(t *testing.T, localpart, password string) (userID, acc
 	return userID, accessToken, deviceID
 }
 
-//RegisterUser will register the user with given parameters and
+// LoginUserWithDeviceID will log in to a homeserver on an existing device
+func (c *CSAPI) LoginUserWithDeviceID(t *testing.T, localpart, password, deviceID string) (userID, accessToken string) {
+	t.Helper()
+	reqBody := map[string]interface{}{
+		"identifier": map[string]interface{}{
+			"type": "m.id.user",
+			"user": localpart,
+		},
+		"device_id": deviceID,
+		"password":  password,
+		"type":      "m.login.password",
+	}
+	res := c.MustDoFunc(t, "POST", []string{"_matrix", "client", "v3", "login"}, WithJSONBody(t, reqBody))
+
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Fatalf("unable to read response body: %v", err)
+	}
+
+	userID = gjson.GetBytes(body, "user_id").Str
+	accessToken = gjson.GetBytes(body, "access_token").Str
+	if gjson.GetBytes(body, "device_id").Str != deviceID {
+		t.Fatalf("device_id returned by login does not match the one requested")
+	}
+	return userID, accessToken
+}
+
+// LoginUserWithRefreshToken will log in to a homeserver, with refresh token enabled,
+// and create a new device on an existing user.
+func (c *CSAPI) LoginUserWithRefreshToken(t *testing.T, localpart, password string) (userID, accessToken, refreshToken, deviceID string, expiresInMs int64) {
+	t.Helper()
+	reqBody := map[string]interface{}{
+		"identifier": map[string]interface{}{
+			"type": "m.id.user",
+			"user": localpart,
+		},
+		"password":      password,
+		"type":          "m.login.password",
+		"refresh_token": true,
+	}
+	res := c.MustDoFunc(t, "POST", []string{"_matrix", "client", "v3", "login"}, WithJSONBody(t, reqBody))
+
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Fatalf("unable to read response body: %v", err)
+	}
+
+	userID = gjson.GetBytes(body, "user_id").Str
+	accessToken = gjson.GetBytes(body, "access_token").Str
+	deviceID = gjson.GetBytes(body, "device_id").Str
+	refreshToken = gjson.GetBytes(body, "refresh_token").Str
+	expiresInMs = gjson.GetBytes(body, "expires_in_ms").Int()
+	return userID, accessToken, refreshToken, deviceID, expiresInMs
+}
+
+// RefreshToken will consume a refresh token and return a new access token and refresh token.
+func (c *CSAPI) ConsumeRefreshToken(t *testing.T, refreshToken string) (newAccessToken, newRefreshToken string, expiresInMs int64) {
+	t.Helper()
+	reqBody := map[string]interface{}{
+		"refresh_token": refreshToken,
+	}
+	res := c.MustDoFunc(t, "POST", []string{"_matrix", "client", "v3", "refresh"}, WithJSONBody(t, reqBody))
+
+	body, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Fatalf("unable to read response body: %v", err)
+	}
+
+	newAccessToken = gjson.GetBytes(body, "access_token").Str
+	newRefreshToken = gjson.GetBytes(body, "refresh_token").Str
+	expiresInMs = gjson.GetBytes(body, "expires_in_ms").Int()
+	return newAccessToken, newRefreshToken, expiresInMs
+}
+
+// RegisterUser will register the user with given parameters and
 // return user ID & access token, and fail the test on network error
 func (c *CSAPI) RegisterUser(t *testing.T, localpart, password string) (userID, accessToken, deviceID string) {
 	t.Helper()

tests/csapi/txnid_scope_test.go

@@ -0,0 +1,121 @@
+package csapi_tests
+
+import (
+	"testing"
+
+	"github.com/matrix-org/complement/internal/b"
+	"github.com/matrix-org/complement/internal/client"
+	"github.com/matrix-org/complement/runtime"
+	"github.com/tidwall/gjson"
+)
+
+func mustHaveTransactionID(t *testing.T, roomID, eventID string) client.SyncCheckOpt {
+	return client.SyncTimelineHas(roomID, func(r gjson.Result) bool {
+		if r.Get("event_id").Str == eventID {
+			if !r.Get("unsigned.transaction_id").Exists() {
+				t.Fatalf("Event %s in room %s should have a 'transaction_id', but it did not", eventID, roomID)
+			}
+
+			return true
+		}
+
+		return false
+	})
+}
+
+func mustNotHaveTransactionID(t *testing.T, roomID, eventID string) client.SyncCheckOpt {
+	return client.SyncTimelineHas(roomID, func(r gjson.Result) bool {
+		if r.Get("event_id").Str == eventID {
+			res := r.Get("unsigned.transaction_id")
+			if res.Exists() {
+				t.Fatalf("Event %s in room %s should NOT have a 'transaction_id', but it did (%s)", eventID, roomID, res.Str)
+			}
+
+			return true
+		}
+
+		return false
+	})
+}
+
+// TestTxnAfterRefresh tests that when a client refreshes its access token,
+// it still gets back a transaction ID in the sync response.
+func TestTxnAfterRefresh(t *testing.T) {
+	// Dendrite doesn't support refresh tokens yet.
+	runtime.SkipIf(t, runtime.Dendrite)
+
+	deployment := Deploy(t, b.BlueprintCleanHS)
+	defer deployment.Destroy(t)
+
+	deployment.RegisterUser(t, "hs1", "alice", "password", false)
+
+	c := deployment.Client(t, "hs1", "")
+
+	var refreshToken string
+	c.UserID, c.AccessToken, refreshToken, c.DeviceID, _ = c.LoginUserWithRefreshToken(t, "alice", "password")
+
+	// Create a room where we can send events.
+	roomID := c.CreateRoom(t, map[string]interface{}{})
+
+	// Let's send an event, and wait for it to appear in the sync.
+	eventID := c.SendEventUnsynced(t, roomID, b.Event{
+		Type: "m.room.message",
+		Content: map[string]interface{}{
+			"msgtype": "m.text",
+			"body":    "first",
+		},
+	})
+
+	// When syncing, we should find the event and it should have a transaction ID.
+	token := c.MustSyncUntil(t, client.SyncReq{}, mustHaveTransactionID(t, roomID, eventID))
+
+	// Now do the same, but refresh the token before syncing.
+	eventID = c.SendEventUnsynced(t, roomID, b.Event{
+		Type: "m.room.message",
+		Content: map[string]interface{}{
+			"msgtype": "m.text",
+			"body":    "second",
+		},
+	})
+
+	// Use the refresh token to get a new access token.
+	c.AccessToken, refreshToken, _ = c.ConsumeRefreshToken(t, refreshToken)
+
+	// When syncing, we should find the event and it should also have a transaction ID.
+	c.MustSyncUntil(t, client.SyncReq{Since: token}, mustHaveTransactionID(t, roomID, eventID))
+}
+
+// TestTxnScope tests that transaction IDs are scoped to the access token, not the device
+func TestTxnScope(t *testing.T) {
+	deployment := Deploy(t, b.BlueprintCleanHS)
+	defer deployment.Destroy(t)
+
+	deployment.RegisterUser(t, "hs1", "alice", "password", false)
+
+	// Create a first client, which allocates a device ID.
+	c1 := deployment.Client(t, "hs1", "")
+	c1.UserID, c1.AccessToken, c1.DeviceID = c1.LoginUser(t, "alice", "password")
+
+	// Create a room where we can send events.
+	roomID := c1.CreateRoom(t, map[string]interface{}{})
+
+	// Let's send an event, and wait for it to appear in the timeline.
+	eventID := c1.SendEventUnsynced(t, roomID, b.Event{
+		Type: "m.room.message",
+		Content: map[string]interface{}{
+			"msgtype": "m.text",
+			"body":    "first",
+		},
+	})
+
+	// When syncing, we should find the event and it should have a transaction ID on the first client.
+	c1.MustSyncUntil(t, client.SyncReq{}, mustHaveTransactionID(t, roomID, eventID))
+
+	// Create a second client, inheriting the first device ID.
+	c2 := deployment.Client(t, "hs1", "")
+	c2.UserID, c2.AccessToken = c2.LoginUserWithDeviceID(t, "alice", "password", c1.DeviceID)
+	c2.DeviceID = c1.DeviceID
+
+	// When syncing, we should find the event and it should *not* have a transaction ID on the second client.
+	c2.MustSyncUntil(t, client.SyncReq{}, mustNotHaveTransactionID(t, roomID, eventID))
+}