(WIP) example of using TokenSource

example/pr_review.go

@@ -0,0 +1,99 @@
+// Copyright 2018 Palantir Technologies, Inc.
+//
+// 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.
+
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/google/go-github/v33/github"
+	"github.com/palantir/go-githubapp/githubapp"
+
+	"github.com/go-git/go-git"
+	"github.com/go-git/go-git/storage/memory"
+	transport_http "github.com/go-git/go-git/v5/plumbing/transport/http"
+	"github.com/pkg/errors"
+	"github.com/rs/zerolog"
+)
+
+type PRReviewHandler struct {
+	githubapp.ClientCreator
+
+	preamble string
+}
+
+func (h *PRReviewHandler) Handles() []string {
+	return []string{"pull_request"}
+}
+
+func (h *PRReviewHandler) Handle(ctx context.Context, eventType, deliveryID string, payload []byte) error {
+	var event github.IssueCommentEvent
+	if err := json.Unmarshal(payload, &event); err != nil {
+		return errors.Wrap(err, "failed to parse issue comment event payload")
+	}
+
+	if !event.GetIssue().IsPullRequest() {
+		zerolog.Ctx(ctx).Debug().Msg("Issue comment event is not for a pull request")
+		return nil
+	}
+
+	repo := event.GetRepo()
+	prNum := event.GetIssue().GetNumber()
+	installationID := githubapp.GetInstallationIDFromEvent(&event)
+
+	ctx, logger := githubapp.PreparePRContext(ctx, installationID, repo, event.GetIssue().GetNumber())
+
+	logger.Debug().Msgf("Event action is %s", event.GetAction())
+	if event.GetAction() != "created" {
+		return nil
+	}
+
+	client, ts, err := h.NewInstallationClient(installationID)
+	if err != nil {
+		return err
+	}
+
+	token, err := ts.Token(context.Background())
+	tokenAuth := &transport_http.TokenAuth{Token: token}
+	storer := memory.NewStorage()
+	gitRepo, err := git.Clone(storer, nil, &git.CloneOptions{
+		URL:  "https://github.com/palantir/go-githubapp.git",
+		Auth: tokenAuth,
+	})
+
+	repoOwner := repo.GetOwner().GetLogin()
+	repoName := repo.GetName()
+	author := event.GetComment().GetUser().GetLogin()
+	body := event.GetComment().GetBody()
+
+	if strings.HasSuffix(author, "[bot]") {
+		logger.Debug().Msg("Issue comment was created by a bot")
+		return nil
+	}
+
+	logger.Debug().Msgf("Echoing comment on %s/%s#%d by %s", repoOwner, repoName, prNum, author)
+	msg := fmt.Sprintf("%s\n%s said\n```\n%s\n```\n", h.preamble, author, body)
+	prComment := github.IssueComment{
+		Body: &msg,
+	}
+
+	if _, _, err := client.Issues.CreateComment(ctx, repoOwner, repoName, prNum, &prComment); err != nil {
+		logger.Error().Err(err).Msg("Failed to comment on pull request")
+	}
+
+	return nil
+}

go.mod

@@ -5,6 +5,7 @@ go 1.13
 require (
 	github.com/alexedwards/scs v1.4.1
 	github.com/bradleyfalzon/ghinstallation v1.1.1
+	github.com/go-git/go-git/v5 v5.3.0 // indirect
 	github.com/google/go-github/v29 v29.0.3 // indirect
 	github.com/google/go-github/v33 v33.0.0
 	github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79
@@ -17,5 +18,5 @@ require (
 	github.com/shurcooL/graphql v0.0.0-20181231061246-d48a9a75455f // indirect
 	goji.io v2.0.2+incompatible
 	golang.org/x/oauth2 v0.0.0-20210113205817-d3ed898aa8a3
-	gopkg.in/yaml.v2 v2.2.8
+	gopkg.in/yaml.v2 v2.3.0
 )