Use github.com/matrix-org/util

src/github.com/matrix-org/go-neb/api/handlers/auth.go

@@ -10,9 +10,9 @@ import (
 	log "github.com/Sirupsen/logrus"
 	"github.com/matrix-org/go-neb/api"
 	"github.com/matrix-org/go-neb/database"
-	"github.com/matrix-org/go-neb/errors"
 	"github.com/matrix-org/go-neb/metrics"
 	"github.com/matrix-org/go-neb/types"
+	"github.com/matrix-org/util"
 )
 
 // RequestAuthSession represents an HTTP handler capable of processing /admin/requestAuthSession requests.
@@ -40,13 +40,13 @@ type RequestAuthSession struct {
 //  {
 //      // AuthRealm-specific information
 //  }
-func (h *RequestAuthSession) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (h *RequestAuthSession) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	if req.Method != "POST" {
-		return nil, &errors.HTTPError{nil, "Unsupported Method", 405}
+		return nil, &util.HTTPError{nil, "Unsupported Method", 405}
 	}
 	var body api.RequestAuthSessionRequest
 	if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing request JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing request JSON", 400}
 	}
 	log.WithFields(log.Fields{
 		"realm_id": body.RealmID,
@@ -54,17 +54,17 @@ func (h *RequestAuthSession) OnIncomingRequest(req *http.Request) (interface{},
 	}).Print("Incoming auth session request")
 
 	if err := body.Check(); err != nil {
-		return nil, &errors.HTTPError{err, err.Error(), 400}
+		return nil, &util.HTTPError{err, err.Error(), 400}
 	}
 
 	realm, err := h.Db.LoadAuthRealm(body.RealmID)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Unknown RealmID", 400}
+		return nil, &util.HTTPError{err, "Unknown RealmID", 400}
 	}
 
 	response := realm.RequestAuthSession(body.UserID, body.Config)
 	if response == nil {
-		return nil, &errors.HTTPError{nil, "Failed to request auth session", 500}
+		return nil, &util.HTTPError{nil, "Failed to request auth session", 500}
 	}
 
 	metrics.IncrementAuthSession(realm.Type())
@@ -90,16 +90,16 @@ type RemoveAuthSession struct {
 // Response:
 //  HTTP/1.1 200 OK
 //  {}
-func (h *RemoveAuthSession) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (h *RemoveAuthSession) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	if req.Method != "POST" {
-		return nil, &errors.HTTPError{nil, "Unsupported Method", 405}
+		return nil, &util.HTTPError{nil, "Unsupported Method", 405}
 	}
 	var body struct {
 		RealmID string
 		UserID  string
 	}
 	if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing request JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing request JSON", 400}
 	}
 	log.WithFields(log.Fields{
 		"realm_id": body.RealmID,
@@ -107,16 +107,16 @@ func (h *RemoveAuthSession) OnIncomingRequest(req *http.Request) (interface{}, *
 	}).Print("Incoming remove auth session request")
 
 	if body.UserID == "" || body.RealmID == "" {
-		return nil, &errors.HTTPError{nil, `Must supply a "UserID", a "RealmID"`, 400}
+		return nil, &util.HTTPError{nil, `Must supply a "UserID", a "RealmID"`, 400}
 	}
 
 	_, err := h.Db.LoadAuthRealm(body.RealmID)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Unknown RealmID", 400}
+		return nil, &util.HTTPError{err, "Unknown RealmID", 400}
 	}
 
 	if err := h.Db.RemoveAuthSession(body.RealmID, body.UserID); err != nil {
-		return nil, &errors.HTTPError{err, "Failed to remove auth session", 500}
+		return nil, &util.HTTPError{err, "Failed to remove auth session", 500}
 	}
 
 	return []byte(`{}`), nil
@@ -186,31 +186,31 @@ type ConfigureAuthRealm struct {
 //          // New auth realm config information
 //      },
 //  }
-func (h *ConfigureAuthRealm) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (h *ConfigureAuthRealm) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	if req.Method != "POST" {
-		return nil, &errors.HTTPError{nil, "Unsupported Method", 405}
+		return nil, &util.HTTPError{nil, "Unsupported Method", 405}
 	}
 	var body api.ConfigureAuthRealmRequest
 	if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing request JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing request JSON", 400}
 	}
 
 	if err := body.Check(); err != nil {
-		return nil, &errors.HTTPError{err, err.Error(), 400}
+		return nil, &util.HTTPError{err, err.Error(), 400}
 	}
 
 	realm, err := types.CreateAuthRealm(body.ID, body.Type, body.Config)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing config JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing config JSON", 400}
 	}
 
 	if err = realm.Register(); err != nil {
-		return nil, &errors.HTTPError{err, "Error registering auth realm", 400}
+		return nil, &util.HTTPError{err, "Error registering auth realm", 400}
 	}
 
 	oldRealm, err := h.Db.StoreAuthRealm(realm)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Error storing realm", 500}
+		return nil, &util.HTTPError{err, "Error storing realm", 500}
 	}
 
 	return &struct {
@@ -252,25 +252,25 @@ type GetSession struct {
 //  {
 //      "Authenticated": false
 //  }
-func (h *GetSession) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (h *GetSession) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	if req.Method != "POST" {
-		return nil, &errors.HTTPError{nil, "Unsupported Method", 405}
+		return nil, &util.HTTPError{nil, "Unsupported Method", 405}
 	}
 	var body struct {
 		RealmID string
 		UserID  string
 	}
 	if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing request JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing request JSON", 400}
 	}
 
 	if body.RealmID == "" || body.UserID == "" {
-		return nil, &errors.HTTPError{nil, `Must supply a "RealmID" and "UserID"`, 400}
+		return nil, &util.HTTPError{nil, `Must supply a "RealmID" and "UserID"`, 400}
 	}
 
 	session, err := h.Db.LoadAuthSessionByUser(body.RealmID, body.UserID)
 	if err != nil && err != sql.ErrNoRows {
-		return nil, &errors.HTTPError{err, `Failed to load session`, 500}
+		return nil, &util.HTTPError{err, `Failed to load session`, 500}
 	}
 	if err == sql.ErrNoRows {
 		return &struct {

src/github.com/matrix-org/go-neb/api/handlers/client.go

@@ -6,7 +6,7 @@ import (
 
 	"github.com/matrix-org/go-neb/api"
 	"github.com/matrix-org/go-neb/clients"
-	"github.com/matrix-org/go-neb/errors"
+	"github.com/matrix-org/util"
 )
 
 // ConfigureClient represents an HTTP handler capable of processing /admin/configureClient requests.
@@ -39,23 +39,23 @@ type ConfigureClient struct {
 //         // The new api.ClientConfig
 //       }
 //  }
-func (s *ConfigureClient) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (s *ConfigureClient) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	if req.Method != "POST" {
-		return nil, &errors.HTTPError{nil, "Unsupported Method", 405}
+		return nil, &util.HTTPError{nil, "Unsupported Method", 405}
 	}
 
 	var body api.ClientConfig
 	if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing request JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing request JSON", 400}
 	}
 
 	if err := body.Check(); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing client config", 400}
+		return nil, &util.HTTPError{err, "Error parsing client config", 400}
 	}
 
 	oldClient, err := s.Clients.Update(body)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Error storing token", 500}
+		return nil, &util.HTTPError{err, "Error storing token", 500}
 	}
 
 	return &struct {

src/github.com/matrix-org/go-neb/api/handlers/heartbeat.go

@@ -11,7 +11,7 @@ package handlers
 import (
 	"net/http"
 
-	"github.com/matrix-org/go-neb/errors"
+	"github.com/matrix-org/util"
 )
 
 // Heartbeat implements the heartbeat API
@@ -26,6 +26,6 @@ type Heartbeat struct{}
 // Response:
 //  HTTP/1.1 200 OK
 //  {}
-func (*Heartbeat) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (*Heartbeat) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	return &struct{}{}, nil
 }

src/github.com/matrix-org/go-neb/api/handlers/service.go

@@ -11,12 +11,12 @@ import (
 	"github.com/matrix-org/go-neb/api"
 	"github.com/matrix-org/go-neb/clients"
 	"github.com/matrix-org/go-neb/database"
-	"github.com/matrix-org/go-neb/errors"
 	"github.com/matrix-org/go-neb/matrix"
 	"github.com/matrix-org/go-neb/metrics"
 	"github.com/matrix-org/go-neb/polling"
 	"github.com/matrix-org/go-neb/types"
 	"github.com/matrix-org/gomatrix"
+	"github.com/matrix-org/util"
 )
 
 // ConfigureService represents an HTTP handler which can process /admin/configureService requests.
@@ -76,9 +76,9 @@ func (s *ConfigureService) getMutexForServiceID(serviceID string) *sync.Mutex {
 //          // new service-specific config information
 //      },
 //  }
-func (s *ConfigureService) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (s *ConfigureService) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	if req.Method != "POST" {
-		return nil, &errors.HTTPError{nil, "Unsupported Method", 405}
+		return nil, &util.HTTPError{nil, "Unsupported Method", 405}
 	}
 
 	service, httpErr := s.createService(req)
@@ -98,25 +98,25 @@ func (s *ConfigureService) OnIncomingRequest(req *http.Request) (interface{}, *e
 
 	old, err := s.db.LoadService(service.ServiceID())
 	if err != nil && err != sql.ErrNoRows {
-		return nil, &errors.HTTPError{err, "Error loading old service", 500}
+		return nil, &util.HTTPError{err, "Error loading old service", 500}
 	}
 
 	client, err := s.clients.Client(service.ServiceUserID())
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Unknown matrix client", 400}
+		return nil, &util.HTTPError{err, "Unknown matrix client", 400}
 	}
 
 	if err := checkClientForService(service, client); err != nil {
-		return nil, &errors.HTTPError{err, err.Error(), 400}
+		return nil, &util.HTTPError{err, err.Error(), 400}
 	}
 
 	if err = service.Register(old, client); err != nil {
-		return nil, &errors.HTTPError{err, "Failed to register service: " + err.Error(), 500}
+		return nil, &util.HTTPError{err, "Failed to register service: " + err.Error(), 500}
 	}
 
 	oldService, err := s.db.StoreService(service)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Error storing service", 500}
+		return nil, &util.HTTPError{err, "Error storing service", 500}
 	}
 
 	// Start any polling NOW because they may decide to stop it in PostRegister, and we want to make
@@ -141,19 +141,19 @@ func (s *ConfigureService) OnIncomingRequest(req *http.Request) (interface{}, *e
 	}{service.ServiceID(), service.ServiceType(), oldService, service}, nil
 }
 
-func (s *ConfigureService) createService(req *http.Request) (types.Service, *errors.HTTPError) {
+func (s *ConfigureService) createService(req *http.Request) (types.Service, *util.HTTPError) {
 	var body api.ConfigureServiceRequest
 	if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing request JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing request JSON", 400}
 	}
 
 	if err := body.Check(); err != nil {
-		return nil, &errors.HTTPError{err, err.Error(), 400}
+		return nil, &util.HTTPError{err, err.Error(), 400}
 	}
 
 	service, err := types.CreateService(body.ID, body.Type, body.UserID, body.Config)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing config JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing config JSON", 400}
 	}
 	return service, nil
 }
@@ -182,27 +182,27 @@ type GetService struct {
 //          // service-specific config information
 //      }
 //  }
-func (h *GetService) OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError) {
+func (h *GetService) OnIncomingRequest(req *http.Request) (interface{}, *util.HTTPError) {
 	if req.Method != "POST" {
-		return nil, &errors.HTTPError{nil, "Unsupported Method", 405}
+		return nil, &util.HTTPError{nil, "Unsupported Method", 405}
 	}
 	var body struct {
 		ID string
 	}
 	if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
-		return nil, &errors.HTTPError{err, "Error parsing request JSON", 400}
+		return nil, &util.HTTPError{err, "Error parsing request JSON", 400}
 	}
 
 	if body.ID == "" {
-		return nil, &errors.HTTPError{nil, `Must supply a "ID"`, 400}
+		return nil, &util.HTTPError{nil, `Must supply a "ID"`, 400}
 	}
 
 	srv, err := h.Db.LoadService(body.ID)
 	if err != nil {
 		if err == sql.ErrNoRows {
-			return nil, &errors.HTTPError{err, `Service not found`, 404}
+			return nil, &util.HTTPError{err, `Service not found`, 404}
 		}
-		return nil, &errors.HTTPError{err, `Failed to load service`, 500}
+		return nil, &util.HTTPError{err, `Failed to load service`, 500}
 	}
 
 	return &struct {

src/github.com/matrix-org/go-neb/goneb.go

@@ -19,7 +19,6 @@ import (
 	"github.com/matrix-org/go-neb/polling"
 	_ "github.com/matrix-org/go-neb/realms/github"
 	_ "github.com/matrix-org/go-neb/realms/jira"
-	"github.com/matrix-org/go-neb/server"
 	_ "github.com/matrix-org/go-neb/services/echo"
 	_ "github.com/matrix-org/go-neb/services/giphy"
 	_ "github.com/matrix-org/go-neb/services/github"
@@ -29,6 +28,7 @@ import (
 	_ "github.com/matrix-org/go-neb/services/slackapi"
 	_ "github.com/matrix-org/go-neb/services/travisci"
 	"github.com/matrix-org/go-neb/types"
+	"github.com/matrix-org/util"
 	_ "github.com/mattn/go-sqlite3"
 	"github.com/prometheus/client_golang/prometheus"
 	yaml "gopkg.in/yaml.v2"
@@ -175,11 +175,11 @@ func setup(e envVars, mux *http.ServeMux, matrixClient *http.Client) {
 
 	// Handle non-admin paths for normal NEB functioning
 	mux.Handle("/metrics", prometheus.Handler())
-	mux.Handle("/test", prometheus.InstrumentHandler("test", server.MakeJSONAPI(&handlers.Heartbeat{})))
+	mux.Handle("/test", prometheus.InstrumentHandler("test", util.MakeJSONAPI(&handlers.Heartbeat{})))
 	wh := handlers.NewWebhook(db, clients)
-	mux.HandleFunc("/services/hooks/", prometheus.InstrumentHandlerFunc("webhookHandler", server.Protect(wh.Handle)))
+	mux.HandleFunc("/services/hooks/", prometheus.InstrumentHandlerFunc("webhookHandler", util.Protect(wh.Handle)))
 	rh := &handlers.RealmRedirect{db}
-	mux.HandleFunc("/realms/redirects/", prometheus.InstrumentHandlerFunc("realmRedirectHandler", server.Protect(rh.Handle)))
+	mux.HandleFunc("/realms/redirects/", prometheus.InstrumentHandlerFunc("realmRedirectHandler", util.Protect(rh.Handle)))
 
 	// Read exclusively from the config file if one was supplied.
 	// Otherwise, add HTTP listeners for new Services/Sessions/Clients/etc.
@@ -190,13 +190,13 @@ func setup(e envVars, mux *http.ServeMux, matrixClient *http.Client) {
 
 		log.Info("Inserted ", len(cfg.Services), " services")
 	} else {
-		mux.Handle("/admin/getService", prometheus.InstrumentHandler("getService", server.MakeJSONAPI(&handlers.GetService{db})))
-		mux.Handle("/admin/getSession", prometheus.InstrumentHandler("getSession", server.MakeJSONAPI(&handlers.GetSession{db})))
-		mux.Handle("/admin/configureClient", prometheus.InstrumentHandler("configureClient", server.MakeJSONAPI(&handlers.ConfigureClient{clients})))
-		mux.Handle("/admin/configureService", prometheus.InstrumentHandler("configureService", server.MakeJSONAPI(handlers.NewConfigureService(db, clients))))
-		mux.Handle("/admin/configureAuthRealm", prometheus.InstrumentHandler("configureAuthRealm", server.MakeJSONAPI(&handlers.ConfigureAuthRealm{db})))
-		mux.Handle("/admin/requestAuthSession", prometheus.InstrumentHandler("requestAuthSession", server.MakeJSONAPI(&handlers.RequestAuthSession{db})))
-		mux.Handle("/admin/removeAuthSession", prometheus.InstrumentHandler("removeAuthSession", server.MakeJSONAPI(&handlers.RemoveAuthSession{db})))
+		mux.Handle("/admin/getService", prometheus.InstrumentHandler("getService", util.MakeJSONAPI(&handlers.GetService{db})))
+		mux.Handle("/admin/getSession", prometheus.InstrumentHandler("getSession", util.MakeJSONAPI(&handlers.GetSession{db})))
+		mux.Handle("/admin/configureClient", prometheus.InstrumentHandler("configureClient", util.MakeJSONAPI(&handlers.ConfigureClient{clients})))
+		mux.Handle("/admin/configureService", prometheus.InstrumentHandler("configureService", util.MakeJSONAPI(handlers.NewConfigureService(db, clients))))
+		mux.Handle("/admin/configureAuthRealm", prometheus.InstrumentHandler("configureAuthRealm", util.MakeJSONAPI(&handlers.ConfigureAuthRealm{db})))
+		mux.Handle("/admin/requestAuthSession", prometheus.InstrumentHandler("requestAuthSession", util.MakeJSONAPI(&handlers.RequestAuthSession{db})))
+		mux.Handle("/admin/removeAuthSession", prometheus.InstrumentHandler("removeAuthSession", util.MakeJSONAPI(&handlers.RemoveAuthSession{db})))
 	}
 	polling.SetClients(clients)
 	if err := polling.Start(); err != nil {

src/github.com/matrix-org/go-neb/server/server_test.go

@@ -1,28 +0,0 @@
-package server
-
-import (
-	"net/http"
-	"net/http/httptest"
-	"testing"
-)
-
-func TestProtect(t *testing.T) {
-	mockWriter := httptest.NewRecorder()
-	mockReq, _ := http.NewRequest("GET", "http://example.com/foo", nil)
-	h := Protect(func(w http.ResponseWriter, req *http.Request) {
-		panic("oh noes!")
-	})
-
-	h(mockWriter, mockReq)
-
-	expectCode := 500
-	if mockWriter.Code != expectCode {
-		t.Errorf("TestProtect wanted HTTP status %d, got %d", expectCode, mockWriter.Code)
-	}
-
-	expectBody := `{"message":"Internal Server Error"}`
-	actualBody := mockWriter.Body.String()
-	if actualBody != expectBody {
-		t.Errorf("TestProtect wanted body %s, got %s", expectBody, actualBody)
-	}
-}

src/github.com/matrix-org/go-neb/services/github/github_webhook.go

@@ -12,7 +12,6 @@ import (
 	"github.com/matrix-org/go-neb/services/github/client"
 	"github.com/matrix-org/go-neb/services/github/webhook"
 	"github.com/matrix-org/go-neb/types"
-	"github.com/matrix-org/go-neb/util"
 	"github.com/matrix-org/gomatrix"
 )
 
@@ -178,7 +177,7 @@ func (s *WebhookService) Register(oldService types.Service, client *gomatrix.Cli
 	reposForWebhooks := s.repoList()
 
 	// Add hooks for the newly added repos but don't remove hooks for the removed repos: we'll clean those out later
-	newRepos, removedRepos := util.Difference(reposForWebhooks, oldRepos)
+	newRepos, removedRepos := difference(reposForWebhooks, oldRepos)
 	if len(reposForWebhooks) == 0 && len(removedRepos) == 0 {
 		// The user didn't specify any webhooks. This may be a bug or it may be
 		// a conscious decision to remove all webhooks for this service. Figure out
@@ -224,7 +223,7 @@ func (s *WebhookService) PostRegister(oldService types.Service) {
 	newRepos := s.repoList()
 
 	// Register() handled adding the new repos, we just want to clean up after ourselves
-	_, removedRepos := util.Difference(newRepos, oldRepos)
+	_, removedRepos := difference(newRepos, oldRepos)
 	for _, r := range removedRepos {
 		segs := strings.Split(r, "/")
 		if err := s.deleteHook(segs[0], segs[1]); err != nil {
@@ -398,6 +397,36 @@ func sameRepos(a *WebhookService, b *WebhookService) bool {
 	return true
 }
 
+// difference returns the elements that are only in the first list and
+// the elements that are only in the second. As a side-effect this sorts
+// the input lists in-place.
+func difference(a, b []string) (onlyA, onlyB []string) {
+	sort.Strings(a)
+	sort.Strings(b)
+	for {
+		if len(b) == 0 {
+			onlyA = append(onlyA, a...)
+			return
+		}
+		if len(a) == 0 {
+			onlyB = append(onlyB, b...)
+			return
+		}
+		xA := a[0]
+		xB := b[0]
+		if xA < xB {
+			onlyA = append(onlyA, xA)
+			a = a[1:]
+		} else if xA > xB {
+			onlyB = append(onlyB, xB)
+			b = b[1:]
+		} else {
+			a = a[1:]
+			b = b[1:]
+		}
+	}
+}
+
 func (s *WebhookService) githubClientFor(userID string, allowUnauth bool) *gogithub.Client {
 	token, err := getTokenForUser(s.RealmID, userID)
 	if err != nil {

src/github.com/matrix-org/go-neb/services/github/webhook/webhook.go

@@ -13,22 +13,22 @@ import (
 
 	log "github.com/Sirupsen/logrus"
 	"github.com/google/go-github/github"
-	"github.com/matrix-org/go-neb/errors"
 	"github.com/matrix-org/gomatrix"
+	"github.com/matrix-org/util"
 )
 
 // OnReceiveRequest processes incoming github webhook requests and returns a
 // matrix message to send, along with parsed repo information.
 // The secretToken, if supplied, will be used to verify the request is from
 // Github. If it isn't, an error is returned.
-func OnReceiveRequest(r *http.Request, secretToken string) (string, *github.Repository, *gomatrix.HTMLMessage, *errors.HTTPError) {
+func OnReceiveRequest(r *http.Request, secretToken string) (string, *github.Repository, *gomatrix.HTMLMessage, *util.HTTPError) {
 	// Verify the HMAC signature if NEB was configured with a secret token
 	eventType := r.Header.Get("X-GitHub-Event")
 	signatureSHA1 := r.Header.Get("X-Hub-Signature")
 	content, err := ioutil.ReadAll(r.Body)
 	if err != nil {
 		log.WithError(err).Print("Failed to read Github webhook body")
-		return "", nil, nil, &errors.HTTPError{nil, "Failed to parse body", 400}
+		return "", nil, nil, &util.HTTPError{nil, "Failed to parse body", 400}
 	}
 	// Verify request if a secret token has been supplied.
 	if secretToken != "" {
@@ -38,14 +38,14 @@ func OnReceiveRequest(r *http.Request, secretToken string) (string, *github.Repo
 		if err != nil {
 			log.WithError(err).WithField("X-Hub-Signature", sigHex).Print(
 				"Failed to decode signature as hex.")
-			return "", nil, nil, &errors.HTTPError{nil, "Failed to decode signature", 400}
+			return "", nil, nil, &util.HTTPError{nil, "Failed to decode signature", 400}
 		}
 
 		if !checkMAC([]byte(content), sigBytes, []byte(secretToken)) {
 			log.WithFields(log.Fields{
 				"X-Hub-Signature": signatureSHA1,
 			}).Print("Received Github event which failed MAC check.")
-			return "", nil, nil, &errors.HTTPError{nil, "Bad signature", 403}
+			return "", nil, nil, &util.HTTPError{nil, "Bad signature", 403}
 		}
 	}
 
@@ -58,13 +58,13 @@ func OnReceiveRequest(r *http.Request, secretToken string) (string, *github.Repo
 		// Github will send a "ping" event when the webhook is first created. We need
 		// to return a 200 in order for the webhook to be marked as "up" (this doesn't
 		// affect delivery, just the tick/cross status flag).
-		return "", nil, nil, &errors.HTTPError{nil, "pong", 200}
+		return "", nil, nil, &util.HTTPError{nil, "pong", 200}
 	}
 
 	htmlStr, repo, refinedType, err := parseGithubEvent(eventType, content)
 	if err != nil {
 		log.WithError(err).Print("Failed to parse github event")
-		return "", nil, nil, &errors.HTTPError{nil, "Failed to parse github event", 500}
+		return "", nil, nil, &util.HTTPError{nil, "Failed to parse github event", 500}
 	}
 
 	msg := gomatrix.GetHTMLMessage("m.notice", htmlStr)

src/github.com/matrix-org/go-neb/services/jira/webhook/webhook.go

@@ -9,8 +9,8 @@ import (
 	log "github.com/Sirupsen/logrus"
 	gojira "github.com/andygrunwald/go-jira"
 	"github.com/matrix-org/go-neb/database"
-	"github.com/matrix-org/go-neb/errors"
 	"github.com/matrix-org/go-neb/realms/jira"
+	"github.com/matrix-org/util"
 )
 
 type jiraWebhook struct {
@@ -101,17 +101,17 @@ func RegisterHook(jrealm *jira.Realm, projects []string, userID, webhookEndpoint
 
 // OnReceiveRequest is called when JIRA hits NEB with an update.
 // Returns the project key and webhook event, or an error.
-func OnReceiveRequest(req *http.Request) (string, *Event, *errors.HTTPError) {
+func OnReceiveRequest(req *http.Request) (string, *Event, *util.HTTPError) {
 	// extract the JIRA webhook event JSON
 	defer req.Body.Close()
 	var whe Event
 	err := json.NewDecoder(req.Body).Decode(&whe)
 	if err != nil {
-		return "", nil, &errors.HTTPError{err, "Failed to parse request JSON", 400}
+		return "", nil, &util.HTTPError{err, "Failed to parse request JSON", 400}
 	}
 
 	if err != nil {
-		return "", nil, &errors.HTTPError{err, "Failed to parse JIRA URL", 400}
+		return "", nil, &util.HTTPError{err, "Failed to parse JIRA URL", 400}
 	}
 	projKey := strings.Split(whe.Issue.Key, "-")[0]
 	projKey = strings.ToUpper(projKey)
@@ -153,18 +153,18 @@ func createWebhook(jrealm *jira.Realm, webhookEndpointURL, userID string) error
 	return err
 }
 
-func getWebhook(cli *gojira.Client, webhookEndpointURL string) (*jiraWebhook, *errors.HTTPError) {
+func getWebhook(cli *gojira.Client, webhookEndpointURL string) (*jiraWebhook, *util.HTTPError) {
 	req, err := cli.NewRequest("GET", "rest/webhooks/1.0/webhook", nil)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Failed to prepare webhook request", 500}
+		return nil, &util.HTTPError{err, "Failed to prepare webhook request", 500}
 	}
 	var webhookList []jiraWebhook
 	res, err := cli.Do(req, &webhookList)
 	if err != nil {
-		return nil, &errors.HTTPError{err, "Failed to query webhooks", 502}
+		return nil, &util.HTTPError{err, "Failed to query webhooks", 502}
 	}
 	if res.StatusCode < 200 || res.StatusCode >= 300 {
-		return nil, &errors.HTTPError{
+		return nil, &util.HTTPError{
 			err,
 			fmt.Sprintf("Querying webhook returned HTTP %d", res.StatusCode),
 			403,
@@ -181,23 +181,23 @@ func getWebhook(cli *gojira.Client, webhookEndpointURL string) (*jiraWebhook, *e
 	return nebWH, nil
 }
 
-func checkProjectsArePublic(jrealm *jira.Realm, projects []string, userID string) *errors.HTTPError {
+func checkProjectsArePublic(jrealm *jira.Realm, projects []string, userID string) *util.HTTPError {
 	publicCli, err := jrealm.JIRAClient("", true)
 	if err != nil {
-		return &errors.HTTPError{err, "Cannot create public JIRA client", 500}
+		return &util.HTTPError{err, "Cannot create public JIRA client", 500}
 	}
 	for _, projectKey := range projects {
 		// check you can query this project with a public client
 		req, err := publicCli.NewRequest("GET", "rest/api/2/project/"+projectKey, nil)
 		if err != nil {
-			return &errors.HTTPError{err, "Failed to create project URL", 500}
+			return &util.HTTPError{err, "Failed to create project URL", 500}
 		}
 		res, err := publicCli.Do(req, nil)
 		if err != nil {
-			return &errors.HTTPError{err, fmt.Sprintf("Failed to query project %s", projectKey), 500}
+			return &util.HTTPError{err, fmt.Sprintf("Failed to query project %s", projectKey), 500}
 		}
 		if res.StatusCode < 200 || res.StatusCode >= 300 {
-			return &errors.HTTPError{err, fmt.Sprintf("Project %s is not public. (HTTP %d)", projectKey, res.StatusCode), 403}
+			return &util.HTTPError{err, fmt.Sprintf("Project %s is not public. (HTTP %d)", projectKey, res.StatusCode), 403}
 		}
 	}
 	return nil

src/github.com/matrix-org/go-neb/util/util.go

@@ -1,35 +0,0 @@
-package util
-
-import (
-	"sort"
-)
-
-// Difference returns the elements that are only in the first list and
-// the elements that are only in the second. As a side-effect this sorts
-// the input lists in-place.
-func Difference(a, b []string) (onlyA, onlyB []string) {
-	sort.Strings(a)
-	sort.Strings(b)
-	for {
-		if len(b) == 0 {
-			onlyA = append(onlyA, a...)
-			return
-		}
-		if len(a) == 0 {
-			onlyB = append(onlyB, b...)
-			return
-		}
-		xA := a[0]
-		xB := b[0]
-		if xA < xB {
-			onlyA = append(onlyA, xA)
-			a = a[1:]
-		} else if xA > xB {
-			onlyB = append(onlyB, xB)
-			b = b[1:]
-		} else {
-			a = a[1:]
-			b = b[1:]
-		}
-	}
-}

vendor/manifest

@@ -141,6 +141,12 @@
 			"revision": "e66d1ef529b7851262b49dc42a26ff1f1d1d9e4d",
 			"branch": "master"
 		},
+		{
+			"importpath": "github.com/matrix-org/util",
+			"repository": "https://github.com/matrix-org/util",
+			"revision": "9b44af331cdd83d702e4f16433e47341d983c23b",
+			"branch": "master"
+		},
 		{
 			"importpath": "github.com/mattn/go-shellwords",
 			"repository": "https://github.com/mattn/go-shellwords",
@@ -218,13 +224,6 @@
 			"revision": "abf152e5f3e97f2fafac028d2cc06c1feb87ffa5",
 			"branch": "master"
 		},
-		{
-			"importpath": "github.com/syndtr/goleveldb/leveldb",
-			"repository": "https://github.com/syndtr/goleveldb",
-			"revision": "6b4daa5362b502898ddf367c5c11deb9e7a5c727",
-			"branch": "master",
-			"path": "/leveldb"
-		},
 		{
 			"importpath": "github.com/russross/blackfriday",
 			"repository": "https://github.com/russross/blackfriday",
@@ -237,6 +236,13 @@
 			"revision": "10ef21a441db47d8b13ebcc5fd2310f636973c77",
 			"branch": "master"
 		},
+		{
+			"importpath": "github.com/syndtr/goleveldb/leveldb",
+			"repository": "https://github.com/syndtr/goleveldb",
+			"revision": "6b4daa5362b502898ddf367c5c11deb9e7a5c727",
+			"branch": "master",
+			"path": "/leveldb"
+		},
 		{
 			"importpath": "golang.org/x/net/context",
 			"repository": "https://go.googlesource.com/net",

vendor/src/github.com/matrix-org/util/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
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+      Work and such Derivative Works in Source or Object form.
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+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
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+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
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+   4. Redistribution. You may reproduce and distribute copies of the
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
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+          include a readable copy of the attribution notices contained
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+          of the following places: within a NOTICE text file distributed
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "{}"
+      replaced with your own identifying information. (Don't include
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+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
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+
+   Copyright {yyyy} {name of copyright owner}
+
+   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.

vendor/src/github.com/matrix-org/util/README.md

@@ -0,0 +1,7 @@
+# util
+
+[![GoDoc](https://godoc.org/github.com/matrix-org/util?status.svg)](https://godoc.org/github.com/matrix-org/util)
+[![Build Status](https://travis-ci.org/matrix-org/util.svg?branch=master)](https://travis-ci.org/matrix-org/util)
+[![Coverage Status](https://coveralls.io/repos/github/matrix-org/util/badge.svg)](https://coveralls.io/github/matrix-org/util)
+
+A loose collection of Golang functions that we use at matrix.org 

src/github.com/matrix-org/go-neb/errors/errors.go → vendor/src/github.com/matrix-org/util/error.go

@@ -1,8 +1,6 @@
-package errors
+package util
 
-import (
-	"fmt"
-)
+import "fmt"
 
 // HTTPError An HTTP Error response, which may wrap an underlying native Go Error.
 type HTTPError struct {

vendor/src/github.com/matrix-org/util/hooks/install.sh

@@ -0,0 +1,5 @@
+#! /bin/bash
+
+DOT_GIT="$(dirname $0)/../.git"
+
+ln -s "../../hooks/pre-commit" "$DOT_GIT/hooks/pre-commit"

vendor/src/github.com/matrix-org/util/hooks/pre-commit

@@ -0,0 +1,9 @@
+#! /bin/bash
+
+set -eu
+
+golint
+go fmt
+go tool vet --all --shadow .
+gocyclo -over 12 .
+go test -timeout 5s -test.v

src/github.com/matrix-org/go-neb/server/server.go → vendor/src/github.com/matrix-org/util/json.go

@@ -1,21 +1,29 @@
-// Package server contains building blocks for REST APIs.
-package server
+package util
 
 import (
+	"context"
 	"encoding/json"
-	log "github.com/Sirupsen/logrus"
-	"github.com/matrix-org/go-neb/errors"
+	"fmt"
+	"math/rand"
 	"net/http"
 	"runtime/debug"
+
+	log "github.com/Sirupsen/logrus"
 )
 
+// ContextKeys is a type alias for string to namespace Context keys per-package.
+type ContextKeys string
+
+// CtxValueLogger is the key to extract the logrus Logger.
+const CtxValueLogger = ContextKeys("logger")
+
 // JSONRequestHandler represents an interface that must be satisfied in order to respond to incoming
 // HTTP requests with JSON. The interface returned will be marshalled into JSON to be sent to the client,
 // unless the interface is []byte in which case the bytes are sent to the client unchanged.
 // If an error is returned, a JSON error response will also be returned, unless the error code
 // is a 302 REDIRECT in which case a redirect is sent based on the Message field.
 type JSONRequestHandler interface {
-	OnIncomingRequest(req *http.Request) (interface{}, *errors.HTTPError)
+	OnIncomingRequest(req *http.Request) (interface{}, *HTTPError)
 }
 
 // JSONError represents a JSON API error response
@@ -23,34 +31,21 @@ type JSONError struct {
 	Message string `json:"message"`
 }
 
-// WithCORSOptions intercepts all OPTIONS requests and responds with CORS headers. The request handler
-// is not invoked when this happens.
-func WithCORSOptions(handler http.HandlerFunc) http.HandlerFunc {
-	return func(w http.ResponseWriter, req *http.Request) {
-		if req.Method == "OPTIONS" {
-			SetCORSHeaders(w)
-			return
-		}
-		handler(w, req)
-	}
-}
-
 // Protect panicking HTTP requests from taking down the entire process, and log them using
 // the correct logger, returning a 500 with a JSON response rather than abruptly closing the
-// connection.
+// connection. The http.Request MUST have a CtxValueLogger.
 func Protect(handler http.HandlerFunc) http.HandlerFunc {
 	return func(w http.ResponseWriter, req *http.Request) {
 		defer func() {
 			if r := recover(); r != nil {
-				log.WithFields(log.Fields{
+				logger := req.Context().Value(CtxValueLogger).(*log.Entry)
+				logger.WithFields(log.Fields{
 					"panic": r,
-					"method": req.Method,
-					"url":    req.URL,
 				}).Errorf(
 					"Request panicked!\n%s", debug.Stack(),
 				)
 				jsonErrorResponse(
-					w, req, &errors.HTTPError{nil, "Internal Server Error", 500},
+					w, req, &HTTPError{nil, "Internal Server Error", 500},
 				)
 			}
 		}()
@@ -59,12 +54,19 @@ func Protect(handler http.HandlerFunc) http.HandlerFunc {
 }
 
 // MakeJSONAPI creates an HTTP handler which always responds to incoming requests with JSON responses.
+// Incoming http.Requests will have a logger (with a request ID/method/path logged) attached to the Context.
+// This can be accessed via the const CtxValueLogger. The type of the logger is *log.Entry from github.com/Sirupsen/logrus
 func MakeJSONAPI(handler JSONRequestHandler) http.HandlerFunc {
 	return Protect(func(w http.ResponseWriter, req *http.Request) {
-		logger := log.WithFields(log.Fields{
-			"method": req.Method,
-			"url":    req.URL,
-		})
+		// Set a Logger on the context
+		ctx := context.WithValue(req.Context(), CtxValueLogger, log.WithFields(log.Fields{
+			"req.method": req.Method,
+			"req.path":   req.URL.Path,
+			"req.id":     RandomString(12),
+		}))
+		req = req.WithContext(ctx)
+
+		logger := req.Context().Value(CtxValueLogger).(*log.Entry)
 		logger.Print("Incoming request")
 
 		res, httpErr := handler.OnIncomingRequest(req)
@@ -85,28 +87,25 @@ func MakeJSONAPI(handler JSONRequestHandler) http.HandlerFunc {
 		if !ok {
 			r, err := json.Marshal(res)
 			if err != nil {
-				jsonErrorResponse(w, req, &errors.HTTPError{nil, "Failed to serialise response as JSON", 500})
+				jsonErrorResponse(w, req, &HTTPError{nil, "Failed to serialise response as JSON", 500})
 				return
 			}
-			logger.Print("<<< Returning response ", string(r))
 			resBytes = r
 		}
+		logger.Print(fmt.Sprintf("Responding (%d bytes)", len(resBytes)))
 		w.Write(resBytes)
 	})
 }
 
-func jsonErrorResponse(w http.ResponseWriter, req *http.Request, httpErr *errors.HTTPError) {
+func jsonErrorResponse(w http.ResponseWriter, req *http.Request, httpErr *HTTPError) {
+	logger := req.Context().Value(CtxValueLogger).(*log.Entry)
 	if httpErr.Code == 302 {
-		log.WithField("err", httpErr.Error()).Print("Redirecting")
+		logger.WithField("err", httpErr.Error()).Print("Redirecting")
 		http.Redirect(w, req, httpErr.Message, 302)
 		return
 	}
-
-	log.WithField("err", httpErr.Error()).Print("Request failed")
-	log.WithFields(log.Fields{
-		"url":     req.URL,
-		"code":    httpErr.Code,
-		"message": httpErr.Message,
+	logger.WithFields(log.Fields{
+		log.ErrorKey: httpErr,
 	}).Print("Responding with error")
 
 	w.WriteHeader(httpErr.Code) // Set response code
@@ -117,7 +116,7 @@ func jsonErrorResponse(w http.ResponseWriter, req *http.Request, httpErr *errors
 	if err != nil {
 		// We should never fail to marshal the JSON error response, but in this event just skip
 		// marshalling altogether
-		log.Warn("Failed to marshal error response")
+		logger.Warn("Failed to marshal error response")
 		w.Write([]byte(`{}`))
 		return
 	}
@@ -130,3 +129,14 @@ func SetCORSHeaders(w http.ResponseWriter) {
 	w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
 	w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")
 }
+
+const alphanumerics = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+// RandomString generates a pseudo-random string of length n.
+func RandomString(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = alphanumerics[rand.Int63()%int64(len(alphanumerics))]
+	}
+	return string(b)
+}

vendor/src/github.com/matrix-org/util/json_test.go

@@ -0,0 +1,99 @@
+package util
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	log "github.com/Sirupsen/logrus"
+)
+
+type MockJSONRequestHandler struct {
+	handler func(req *http.Request) (interface{}, *HTTPError)
+}
+
+func (h *MockJSONRequestHandler) OnIncomingRequest(req *http.Request) (interface{}, *HTTPError) {
+	return h.handler(req)
+}
+
+type MockResponse struct {
+	Foo string `json:"foo"`
+}
+
+func TestMakeJSONAPI(t *testing.T) {
+	log.SetLevel(log.PanicLevel) // suppress logs in test output
+	tests := []struct {
+		Return     interface{}
+		Err        *HTTPError
+		ExpectCode int
+		ExpectJSON string
+	}{
+		{nil, &HTTPError{nil, "Everything is broken", 500}, 500, `{"message":"Everything is broken"}`},         // Error return values
+		{nil, &HTTPError{nil, "Not here", 404}, 404, `{"message":"Not here"}`},                                 // With different status codes
+		{&MockResponse{"yep"}, nil, 200, `{"foo":"yep"}`},                                                      // Success return values
+		{[]MockResponse{{"yep"}, {"narp"}}, nil, 200, `[{"foo":"yep"},{"foo":"narp"}]`},                        // Top-level array success values
+		{[]byte(`actually bytes`), nil, 200, `actually bytes`},                                                 // raw []byte escape hatch
+		{func(cannotBe, marshalled string) {}, nil, 500, `{"message":"Failed to serialise response as JSON"}`}, // impossible marshal
+	}
+
+	for _, tst := range tests {
+		mock := MockJSONRequestHandler{func(req *http.Request) (interface{}, *HTTPError) {
+			return tst.Return, tst.Err
+		}}
+		mockReq, _ := http.NewRequest("GET", "http://example.com/foo", nil)
+		mockWriter := httptest.NewRecorder()
+		handlerFunc := MakeJSONAPI(&mock)
+		handlerFunc(mockWriter, mockReq)
+		if mockWriter.Code != tst.ExpectCode {
+			t.Errorf("TestMakeJSONAPI wanted HTTP status %d, got %d", tst.ExpectCode, mockWriter.Code)
+		}
+		actualBody := mockWriter.Body.String()
+		if actualBody != tst.ExpectJSON {
+			t.Errorf("TestMakeJSONAPI wanted body '%s', got '%s'", tst.ExpectJSON, actualBody)
+		}
+	}
+}
+
+func TestMakeJSONAPIRedirect(t *testing.T) {
+	log.SetLevel(log.PanicLevel) // suppress logs in test output
+	mock := MockJSONRequestHandler{func(req *http.Request) (interface{}, *HTTPError) {
+		return nil, &HTTPError{nil, "https://matrix.org", 302}
+	}}
+	mockReq, _ := http.NewRequest("GET", "http://example.com/foo", nil)
+	mockWriter := httptest.NewRecorder()
+	handlerFunc := MakeJSONAPI(&mock)
+	handlerFunc(mockWriter, mockReq)
+	if mockWriter.Code != 302 {
+		t.Errorf("TestMakeJSONAPIRedirect wanted HTTP status 302, got %d", mockWriter.Code)
+	}
+	location := mockWriter.Header().Get("Location")
+	if location != "https://matrix.org" {
+		t.Errorf("TestMakeJSONAPIRedirect wanted Location header 'https://matrix.org', got '%s'", location)
+	}
+}
+
+func TestProtect(t *testing.T) {
+	log.SetLevel(log.PanicLevel) // suppress logs in test output
+	mockWriter := httptest.NewRecorder()
+	mockReq, _ := http.NewRequest("GET", "http://example.com/foo", nil)
+	mockReq = mockReq.WithContext(
+		context.WithValue(mockReq.Context(), CtxValueLogger, log.WithField("test", "yep")),
+	)
+	h := Protect(func(w http.ResponseWriter, req *http.Request) {
+		panic("oh noes!")
+	})
+
+	h(mockWriter, mockReq)
+
+	expectCode := 500
+	if mockWriter.Code != expectCode {
+		t.Errorf("TestProtect wanted HTTP status %d, got %d", expectCode, mockWriter.Code)
+	}
+
+	expectBody := `{"message":"Internal Server Error"}`
+	actualBody := mockWriter.Body.String()
+	if actualBody != expectBody {
+		t.Errorf("TestProtect wanted body %s, got %s", expectBody, actualBody)
+	}
+}