go-github: add support for issue locking / unlocking

Fixes #279.

Change-Id: I55ffdadfe5970d664ac94048e8bc2b8f5d935903

github/github.go

@@ -56,6 +56,9 @@ const (
 
 	// https://developer.github.com/changes/2015-11-11-protected-branches-api/
 	mediaTypeProtectedBranchesPreview = "application/vnd.github.loki-preview+json"
+
+	// https://developer.github.com/changes/2016-02-11-issue-locking-api/
+	mediaTypeIssueLockingPreview = "application/vnd.github.the-key-preview+json"
 )
 
 // A Client manages communication with the GitHub API.

github/issues.go

@@ -260,3 +260,35 @@ func (s *IssuesService) Edit(owner string, repo string, number int, issue *Issue
 
 	return i, resp, err
 }
+
+// Lock an issue's conversation.
+//
+// GitHub API docs: https://developer.github.com/v3/issues/#lock-an-issue
+func (s *IssuesService) Lock(owner string, repo string, number int) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/issues/%d/lock", owner, repo, number)
+	req, err := s.client.NewRequest("PUT", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeIssueLockingPreview)
+
+	return s.client.Do(req, nil)
+}
+
+// Unlock an issue's conversation.
+//
+// GitHub API docs: https://developer.github.com/v3/issues/#unlock-an-issue
+func (s *IssuesService) Unlock(owner string, repo string, number int) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/issues/%d/lock", owner, repo, number)
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeIssueLockingPreview)
+
+	return s.client.Do(req, nil)
+}

github/issues_test.go

@@ -240,3 +240,35 @@ func TestIssuesService_Edit_invalidOwner(t *testing.T) {
 	_, _, err := client.Issues.Edit("%", "r", 1, nil)
 	testURLParseError(t, err)
 }
+
+func TestIssuesService_Lock(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/issues/1/lock", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "PUT")
+		testHeader(t, r, "Accept", mediaTypeIssueLockingPreview)
+
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	if _, err := client.Issues.Lock("o", "r", 1); err != nil {
+		t.Errorf("Issues.Lock returned error: %v", err)
+	}
+}
+
+func TestIssuesService_Unlock(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/issues/1/lock", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "DELETE")
+		testHeader(t, r, "Accept", mediaTypeIssueLockingPreview)
+
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	if _, err := client.Issues.Unlock("o", "r", 1); err != nil {
+		t.Errorf("Issues.Unlock returned error: %v", err)
+	}
+}