Fix body delivery bytes being incorrectly copied

CHANGELOG

@@ -1,5 +1,6 @@
 v0.2.1 2018-08-19
 
+* Request body is now correctly copied when sending federation messages.
 * Change RWType and FollowResponse to bool and uint8, respectively.
 * Update README with applications using the go-fed/activity library.
 * Update README with links to official implementation reports for go-fed.

pub/fed_test.go

@@ -6616,3 +6616,55 @@ func TestIssue75(t *testing.T) {
 		t.Fatalf("unexpected callback object: %s", err)
 	}
 }
+
+func TestDelivery_Bytes(t *testing.T) {
+	app, socialApp, fedApp, socialCb, fedCb, d, httpClient, p := NewPubberTest(t)
+	PreparePubberPostOutboxTest(t, app, socialApp, fedApp, socialCb, fedCb, d, httpClient, p)
+	resp := httptest.NewRecorder()
+	req := Sign(ActivityPubRequest(httptest.NewRequest("POST", testOutboxURI, bytes.NewBuffer(MustSerialize(testCreateNote)))))
+	socialCb.create = func(c context.Context, s *streams.Create) error {
+		return nil
+	}
+	gotHttpDo := 0
+	var httpDeliveryRequest *http.Request
+	httpClient.do = func(req *http.Request) (*http.Response, error) {
+		gotHttpDo++
+		if gotHttpDo == 1 {
+			actorResp := &http.Response{
+				StatusCode: http.StatusOK,
+				Body:       ioutil.NopCloser(bytes.NewBuffer(samActorJSON)),
+			}
+			return actorResp, nil
+		} else if gotHttpDo == 2 {
+			actorResp := &http.Response{
+				StatusCode: http.StatusOK,
+				Body:       ioutil.NopCloser(bytes.NewBuffer(sallyActorJSON)),
+			}
+			return actorResp, nil
+		} else if gotHttpDo == 3 {
+			httpDeliveryRequest = req
+			okResp := &http.Response{
+				StatusCode: http.StatusOK,
+				Body:       ioutil.NopCloser(bytes.NewBuffer([]byte{})),
+			}
+			return okResp, nil
+		}
+		return nil, nil
+	}
+	handled, err := p.PostOutbox(context.Background(), resp, req)
+	if err != nil {
+		t.Fatal(err)
+	} else if !handled {
+		t.Fatalf("expected handled, got !handled")
+	} else if gotHttpDo != 3 {
+		t.Fatalf("expected %d, got %d", 3, gotHttpDo)
+	} else if httpDeliveryRequest.Method != "POST" {
+		t.Fatalf("expected %s, got %s", "POST", httpDeliveryRequest.Method)
+	} else if deliveryBody, err := ioutil.ReadAll(httpDeliveryRequest.Body); err != nil {
+		t.Fatal(err)
+	} else if len(deliveryBody) == 0 {
+		t.Fatalf("empty delivery body")
+	} else if s := httpDeliveryRequest.URL.String(); s != samIRIInboxString {
+		t.Fatalf("expected %s, got %s", samIRIInboxString, s)
+	}
+}

pub/internal.go

@@ -167,8 +167,8 @@ func (f *federator) dereferenceAsUser(boxIRI, fetchIRI *url.URL) (obj vocab.Obje
 //
 // creds is able to be nil.
 func postToOutbox(c HttpClient, b []byte, to *url.URL, agent string, creds *creds, clock Clock) error {
-	byteCopy := make([]byte, 0, len(b))
-	copy(b, byteCopy)
+	byteCopy := make([]byte, len(b))
+	copy(byteCopy, b)
 	buf := bytes.NewBuffer(byteCopy)
 	req, err := http.NewRequest("POST", to.String(), buf)
 	if err != nil {