Tweak AS registration check and AS component HTTP clients (#1785)

* Tweak AS registration check

* Check appservice usernames using correct function

* Update sytest-whitelist

* Use gomatrixserverlib.Client since that allows us to disable TLS validation using the config

* Add appservice-specific client and ability to control TLS validation for appservices only

* Set timeout on appservice client

* Review comments

* Remove dead code

* Enforce LoginTypeApplicationService after all

* Check correct auth type field

3 files changed, 13 insertions, 39 deletions

diff --git a/appservice/appservice.go b/appservice/appservice.go
index d783c7eb..f608e8e7 100644
--- a/appservice/appservice.go
+++ b/appservice/appservice.go
@@ -16,9 +16,7 @@ package appservice
 
 import (
 	"context"
-	"net/http"
 	"sync"
-	"time"
 
 	"github.com/gorilla/mux"
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
@@ -48,6 +46,7 @@ func NewInternalAPI(
 	userAPI userapi.UserInternalAPI,
 	rsAPI roomserverAPI.RoomserverInternalAPI,
 ) appserviceAPI.AppServiceQueryAPI {
+	client := base.CreateAppserviceClient()
 	consumer, _ := kafka.SetupConsumerProducer(&base.Cfg.Global.Kafka)
 
 	// Create a connection to the appservice postgres DB
@@ -79,10 +78,8 @@ func NewInternalAPI(
 	// Create appserivce query API with an HTTP client that will be used for all
 	// outbound and inbound requests (inbound only for the internal API)
 	appserviceQueryAPI := &query.AppServiceQueryAPI{
-		HTTPClient: &http.Client{
-			Timeout: time.Second * 30,
-		},
-		Cfg: base.Cfg,
+		HTTPClient: client,
+		Cfg:        base.Cfg,
 	}
 
 	// Only consume if we actually have ASes to track, else we'll just chew cycles needlessly.
@@ -98,7 +95,7 @@ func NewInternalAPI(
 	}
 
 	// Create application service transaction workers
-	if err := workers.SetupTransactionWorkers(appserviceDB, workerStates); err != nil {
+	if err := workers.SetupTransactionWorkers(client, appserviceDB, workerStates); err != nil {
 		logrus.WithError(err).Panicf("failed to start app service transaction workers")
 	}
 	return appserviceQueryAPI
diff --git a/appservice/query/query.go b/appservice/query/query.go
index 7e5ac475..b4c33528 100644
--- a/appservice/query/query.go
+++ b/appservice/query/query.go
@@ -20,10 +20,10 @@ import (
 	"context"
 	"net/http"
 	"net/url"
-	"time"
 
 	"github.com/matrix-org/dendrite/appservice/api"
 	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/gomatrixserverlib"
 	opentracing "github.com/opentracing/opentracing-go"
 	log "github.com/sirupsen/logrus"
 )
@@ -33,7 +33,7 @@ const userIDExistsPath = "/users/"
 
 // AppServiceQueryAPI is an implementation of api.AppServiceQueryAPI
 type AppServiceQueryAPI struct {
-	HTTPClient *http.Client
+	HTTPClient *gomatrixserverlib.Client
 	Cfg        *config.Dendrite
 }
 
@@ -47,11 +47,6 @@ func (a *AppServiceQueryAPI) RoomAliasExists(
 	span, ctx := opentracing.StartSpanFromContext(ctx, "ApplicationServiceRoomAlias")
 	defer span.Finish()
 
-	// Create an HTTP client if one does not already exist
-	if a.HTTPClient == nil {
-		a.HTTPClient = makeHTTPClient()
-	}
-
 	// Determine which application service should handle this request
 	for _, appservice := range a.Cfg.Derived.ApplicationServices {
 		if appservice.URL != "" && appservice.IsInterestedInRoomAlias(request.Alias) {
@@ -68,7 +63,7 @@ func (a *AppServiceQueryAPI) RoomAliasExists(
 			}
 			req = req.WithContext(ctx)
 
-			resp, err := a.HTTPClient.Do(req)
+			resp, err := a.HTTPClient.DoHTTPRequest(ctx, req)
 			if resp != nil {
 				defer func() {
 					err = resp.Body.Close()
@@ -115,11 +110,6 @@ func (a *AppServiceQueryAPI) UserIDExists(
 	span, ctx := opentracing.StartSpanFromContext(ctx, "ApplicationServiceUserID")
 	defer span.Finish()
 
-	// Create an HTTP client if one does not already exist
-	if a.HTTPClient == nil {
-		a.HTTPClient = makeHTTPClient()
-	}
-
 	// Determine which application service should handle this request
 	for _, appservice := range a.Cfg.Derived.ApplicationServices {
 		if appservice.URL != "" && appservice.IsInterestedInUserID(request.UserID) {
@@ -134,7 +124,7 @@ func (a *AppServiceQueryAPI) UserIDExists(
 			if err != nil {
 				return err
 			}
-			resp, err := a.HTTPClient.Do(req.WithContext(ctx))
+			resp, err := a.HTTPClient.DoHTTPRequest(ctx, req)
 			if resp != nil {
 				defer func() {
 					err = resp.Body.Close()
@@ -169,10 +159,3 @@ func (a *AppServiceQueryAPI) UserIDExists(
 	response.UserIDExists = false
 	return nil
 }
-
-// makeHTTPClient creates an HTTP client with certain options that will be used for all query requests to application services
-func makeHTTPClient() *http.Client {
-	return &http.Client{
-		Timeout: time.Second * 30,
-	}
-}
diff --git a/appservice/workers/transaction_scheduler.go b/appservice/workers/transaction_scheduler.go
index 45748c21..47d447c2 100644
--- a/appservice/workers/transaction_scheduler.go
+++ b/appservice/workers/transaction_scheduler.go
@@ -34,8 +34,6 @@ import (
 var (
 	// Maximum size of events sent in each transaction.
 	transactionBatchSize = 50
-	// Timeout for sending a single transaction to an application service.
-	transactionTimeout = time.Second * 60
 )
 
 // SetupTransactionWorkers spawns a separate goroutine for each application
@@ -44,6 +42,7 @@ var (
 // size), then send that off to the AS's /transactions/{txnID} endpoint. It also
 // handles exponentially backing off in case the AS isn't currently available.
 func SetupTransactionWorkers(
+	client *gomatrixserverlib.Client,
 	appserviceDB storage.Database,
 	workerStates []types.ApplicationServiceWorkerState,
 ) error {
@@ -51,7 +50,7 @@ func SetupTransactionWorkers(
 	for _, workerState := range workerStates {
 		// Don't create a worker if this AS doesn't want to receive events
 		if workerState.AppService.URL != "" {
-			go worker(appserviceDB, workerState)
+			go worker(client, appserviceDB, workerState)
 		}
 	}
 	return nil
@@ -59,17 +58,12 @@ func SetupTransactionWorkers(
 
 // worker is a goroutine that sends any queued events to the application service
 // it is given.
-func worker(db storage.Database, ws types.ApplicationServiceWorkerState) {
+func worker(client *gomatrixserverlib.Client, db storage.Database, ws types.ApplicationServiceWorkerState) {
 	log.WithFields(log.Fields{
 		"appservice": ws.AppService.ID,
 	}).Info("Starting application service")
 	ctx := context.Background()
 
-	// Create a HTTP client for sending requests to app services
-	client := &http.Client{
-		Timeout: transactionTimeout,
-	}
-
 	// Initial check for any leftover events to send from last time
 	eventCount, err := db.CountEventsWithAppServiceID(ctx, ws.AppService.ID)
 	if err != nil {
@@ -206,7 +200,7 @@ func createTransaction(
 // send sends events to an application service. Returns an error if an OK was not
 // received back from the application service or the request timed out.
 func send(
-	client *http.Client,
+	client *gomatrixserverlib.Client,
 	appservice config.ApplicationService,
 	txnID int,
 	transaction []byte,
@@ -219,7 +213,7 @@ func send(
 		return err
 	}
 	req.Header.Set("Content-Type", "application/json")
-	resp, err := client.Do(req)
+	resp, err := client.DoHTTPRequest(context.TODO(), req)
 	if err != nil {
 		return err
 	}