Implement Push Notifications (#1842)

* Add Pushserver component with Pushers API

Co-authored-by: Tommie Gannert <tommie@gannert.se>
Co-authored-by: Dan Peleg <dan@globekeeper.com>

* Wire Pushserver component

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

* Add PushGatewayClient.

The full event format is required for Sytest.

* Add a pushrules module.

* Change user API account creation to use the new pushrules module's defaults.

Introduces "scope" as required by client API, and some small field
tweaks to make some 61push Sytests pass.

* Add push rules query/put API in Pushserver.

This manipulates account data over User API, and fires sync messages
for changes. Those sync messages should, according to an existing TODO
in clientapi, be moved to userapi.

Forks clientapi/producers/syncapi.go to pushserver/ for later extension.

* Add clientapi routes for push rules to Pushserver.

A cleanup would be to move more of the name-splitting logic into
pushrules.go, to depollute routing.go.

* Output rooms.join.unread_notifications in /sync.

This is the read-side. Pushserver will be the write-side.

* Implement pushserver/storage for notifications.

* Use PushGatewayClient and the pushrules module in Pushserver's room consumer.

* Use one goroutine per user to avoid locking up the entire server for
  one bad push gateway.
* Split pushing by format.
* Send one device per push. Sytest does not support coalescing
  multiple devices into one push. Matches Synapse. Either we change
  Sytest, or remove the group-by-url-and-format logic.
* Write OutputNotificationData from push server. Sync API is already
  the consumer.

* Implement read receipt consumers in Pushserver.

Supports m.read and m.fully_read receipts.

* Add clientapi route for /unstable/notifications.

* Rename to UpsertPusher for clarity and handle pusher update

* Fix linter errors

* Ignore body.Close() error check

* Fix push server internal http wiring

* Add 40 newly passing 61push tests to whitelist

* Add next 12 newly passing 61push tests to whitelist

* Send notification data before notifying users in EDU server consumer

* NATS JetStream

* Goodbye sarama

* Fix `NewStreamTokenFromString`

* Consume on the correct topic for the roomserver

* Don't panic, NAK instead

* Move push notifications into the User API

* Don't set null values since that apparently causes Element upsetti

* Also set omitempty on conditions

* Fix bug so that we don't override the push rules unnecessarily

* Tweak defaults

* Update defaults

* More tweaks

* Move `/notifications` onto `r0`/`v3` mux

* User API will consume events and read/fully read markers from the sync API with stream positions, instead of consuming directly

Co-authored-by: Piotr Kozimor <p1996k@gmail.com>
Co-authored-by: Tommie Gannert <tommie@gannert.se>
Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

1 files changed, 169 insertions, 2 deletions

diff --git a/userapi/internal/api.go b/userapi/internal/api.go
index f54cc613..7a42fc60 100644
--- a/userapi/internal/api.go
+++ b/userapi/internal/api.go
@@ -20,6 +20,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"strconv"
+	"time"
 
 	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
@@ -27,16 +29,22 @@ import (
 
 	"github.com/matrix-org/dendrite/appservice/types"
 	"github.com/matrix-org/dendrite/clientapi/userutil"
+	"github.com/matrix-org/dendrite/internal/pushrules"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
 	keyapi "github.com/matrix-org/dendrite/keyserver/api"
 	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/matrix-org/dendrite/userapi/api"
+	"github.com/matrix-org/dendrite/userapi/producers"
 	"github.com/matrix-org/dendrite/userapi/storage"
+	"github.com/matrix-org/dendrite/userapi/storage/tables"
 )
 
 type UserInternalAPI struct {
-	DB         storage.Database
-	ServerName gomatrixserverlib.ServerName
+	DB           storage.Database
+	SyncProducer *producers.SyncAPI
+
+	DisableTLSValidation bool
+	ServerName           gomatrixserverlib.ServerName
 	// AppServices is the list of all registered AS
 	AppServices []config.ApplicationService
 	KeyAPI      keyapi.KeyInternalAPI
@@ -595,3 +603,162 @@ func (a *UserInternalAPI) QueryKeyBackup(ctx context.Context, req *api.QueryKeyB
 	}
 	res.Keys = result
 }
+
+func (a *UserInternalAPI) QueryNotifications(ctx context.Context, req *api.QueryNotificationsRequest, res *api.QueryNotificationsResponse) error {
+	if req.Limit == 0 || req.Limit > 1000 {
+		req.Limit = 1000
+	}
+
+	var fromID int64
+	var err error
+	if req.From != "" {
+		fromID, err = strconv.ParseInt(req.From, 10, 64)
+		if err != nil {
+			return fmt.Errorf("QueryNotifications: parsing 'from': %w", err)
+		}
+	}
+	var filter tables.NotificationFilter = tables.AllNotifications
+	if req.Only == "highlight" {
+		filter = tables.HighlightNotifications
+	}
+	notifs, lastID, err := a.DB.GetNotifications(ctx, req.Localpart, fromID, req.Limit, filter)
+	if err != nil {
+		return err
+	}
+	if notifs == nil {
+		// This ensures empty is JSON-encoded as [] instead of null.
+		notifs = []*api.Notification{}
+	}
+	res.Notifications = notifs
+	if lastID >= 0 {
+		res.NextToken = strconv.FormatInt(lastID+1, 10)
+	}
+	return nil
+}
+
+func (a *UserInternalAPI) PerformPusherSet(ctx context.Context, req *api.PerformPusherSetRequest, res *struct{}) error {
+	util.GetLogger(ctx).WithFields(logrus.Fields{
+		"localpart":    req.Localpart,
+		"pushkey":      req.Pusher.PushKey,
+		"display_name": req.Pusher.AppDisplayName,
+	}).Info("PerformPusherCreation")
+	if !req.Append {
+		err := a.DB.RemovePushers(ctx, req.Pusher.AppID, req.Pusher.PushKey)
+		if err != nil {
+			return err
+		}
+	}
+	if req.Pusher.Kind == "" {
+		return a.DB.RemovePusher(ctx, req.Pusher.AppID, req.Pusher.PushKey, req.Localpart)
+	}
+	if req.Pusher.PushKeyTS == 0 {
+		req.Pusher.PushKeyTS = gomatrixserverlib.AsTimestamp(time.Now())
+	}
+	return a.DB.UpsertPusher(ctx, req.Pusher, req.Localpart)
+}
+
+func (a *UserInternalAPI) PerformPusherDeletion(ctx context.Context, req *api.PerformPusherDeletionRequest, res *struct{}) error {
+	pushers, err := a.DB.GetPushers(ctx, req.Localpart)
+	if err != nil {
+		return err
+	}
+	for i := range pushers {
+		logrus.Warnf("pusher session: %d, req session: %d", pushers[i].SessionID, req.SessionID)
+		if pushers[i].SessionID != req.SessionID {
+			err := a.DB.RemovePusher(ctx, pushers[i].AppID, pushers[i].PushKey, req.Localpart)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (a *UserInternalAPI) QueryPushers(ctx context.Context, req *api.QueryPushersRequest, res *api.QueryPushersResponse) error {
+	var err error
+	res.Pushers, err = a.DB.GetPushers(ctx, req.Localpart)
+	return err
+}
+
+func (a *UserInternalAPI) PerformPushRulesPut(
+	ctx context.Context,
+	req *api.PerformPushRulesPutRequest,
+	_ *struct{},
+) error {
+	bs, err := json.Marshal(&req.RuleSets)
+	if err != nil {
+		return err
+	}
+	userReq := api.InputAccountDataRequest{
+		UserID:      req.UserID,
+		DataType:    pushRulesAccountDataType,
+		AccountData: json.RawMessage(bs),
+	}
+	var userRes api.InputAccountDataResponse // empty
+	if err := a.InputAccountData(ctx, &userReq, &userRes); err != nil {
+		return err
+	}
+
+	if err := a.SyncProducer.SendAccountData(req.UserID, "" /* roomID */, pushRulesAccountDataType); err != nil {
+		util.GetLogger(ctx).WithError(err).Errorf("syncProducer.SendData failed")
+	}
+
+	return nil
+}
+
+func (a *UserInternalAPI) QueryPushRules(ctx context.Context, req *api.QueryPushRulesRequest, res *api.QueryPushRulesResponse) error {
+	userReq := api.QueryAccountDataRequest{
+		UserID:   req.UserID,
+		DataType: pushRulesAccountDataType,
+	}
+	var userRes api.QueryAccountDataResponse
+	if err := a.QueryAccountData(ctx, &userReq, &userRes); err != nil {
+		return err
+	}
+	bs, ok := userRes.GlobalAccountData[pushRulesAccountDataType]
+	if ok {
+		// Legacy Dendrite users will have completely empty push rules, so we should
+		// detect that situation and set some defaults.
+		var rules struct {
+			G struct {
+				Content   []json.RawMessage `json:"content"`
+				Override  []json.RawMessage `json:"override"`
+				Room      []json.RawMessage `json:"room"`
+				Sender    []json.RawMessage `json:"sender"`
+				Underride []json.RawMessage `json:"underride"`
+			} `json:"global"`
+		}
+		if err := json.Unmarshal([]byte(bs), &rules); err == nil {
+			count := len(rules.G.Content) + len(rules.G.Override) +
+				len(rules.G.Room) + len(rules.G.Sender) + len(rules.G.Underride)
+			ok = count > 0
+		}
+	}
+	if !ok {
+		// If we didn't find any default push rules then we should just generate some
+		// fresh ones.
+		localpart, _, err := gomatrixserverlib.SplitID('@', req.UserID)
+		if err != nil {
+			return fmt.Errorf("failed to split user ID %q for push rules", req.UserID)
+		}
+		pushRuleSets := pushrules.DefaultAccountRuleSets(localpart, a.ServerName)
+		prbs, err := json.Marshal(pushRuleSets)
+		if err != nil {
+			return fmt.Errorf("failed to marshal default push rules: %w", err)
+		}
+		if err := a.DB.SaveAccountData(ctx, localpart, "", pushRulesAccountDataType, json.RawMessage(prbs)); err != nil {
+			return fmt.Errorf("failed to save default push rules: %w", err)
+		}
+		res.RuleSets = pushRuleSets
+		return nil
+	}
+	var data pushrules.AccountRuleSets
+	if err := json.Unmarshal([]byte(bs), &data); err != nil {
+		util.GetLogger(ctx).WithError(err).Error("json.Unmarshal of push rules failed")
+		return err
+	}
+	res.RuleSets = &data
+	return nil
+}
+
+const pushRulesAccountDataType = "m.push_rules"