Add support for authentication as a GitHub App

.travis.yml

@@ -3,9 +3,9 @@ sudo: false
 matrix:
   include:
   - os: osx
-    go: 1.14.x
+    go: 1.16.x
   - os: linux
-    go: 1.14.x
+    go: 1.16.x
 notifications:
   email: false
 script:

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.14 as builder
+FROM golang:1.16 as builder
 ADD . /go/src/github.com/telia-oss/github-pr-resource
 WORKDIR /go/src/github.com/telia-oss/github-pr-resource
 RUN curl -sL https://taskfile.dev/install.sh | sh

github.go

@@ -12,6 +12,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/bradleyfalzon/ghinstallation/v2"
 	"github.com/google/go-github/v28/github"
 	"github.com/shurcooL/githubv4"
 	"golang.org/x/oauth2"
@@ -44,22 +45,45 @@ func NewGithubClient(s *Source) (*GithubClient, error) {
 		return nil, err
 	}
 
+	// We need a transport that we can update if using GitHub App authentication
+	transport := http.DefaultTransport.(*http.Transport).Clone()
+
 	// Skip SSL verification for self-signed certificates
 	// source: https://github.com/google/go-github/pull/598#issuecomment-333039238
 	var ctx context.Context
 	if s.SkipSSLVerification {
-		insecureClient := &http.Client{Transport: &http.Transport{
-			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
-		},
-		}
+		transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
+		insecureClient := &http.Client{Transport: transport}
 		ctx = context.WithValue(context.TODO(), oauth2.HTTPClient, insecureClient)
 	} else {
 		ctx = context.TODO()
 	}
 
-	client := oauth2.NewClient(ctx, oauth2.StaticTokenSource(
-		&oauth2.Token{AccessToken: s.AccessToken},
-	))
+	var client *http.Client
+	if s.UseGitHubApp {
+		var ghAppInstallationTransport *ghinstallation.Transport
+		if s.PrivateKeyFile != "" {
+			ghAppInstallationTransport, err = ghinstallation.NewKeyFromFile(transport, s.ApplicationID, s.InstallationID, s.PrivateKeyFile)
+			if err != nil {
+				return nil, fmt.Errorf("failed to generate application installation access token using private key file: %s", err)
+			}
+		} else {
+			ghAppInstallationTransport, err = ghinstallation.New(transport, s.ApplicationID, s.InstallationID, []byte(s.PrivateKey))
+			if err != nil {
+				return nil, fmt.Errorf("failed to generate application installation access token using private key: %s", err)
+			}
+		}
+
+		// Client using ghinstallation transport
+		client = &http.Client{
+			Transport: ghAppInstallationTransport,
+		}
+	} else {
+		// Client using oauth2 wrapper
+		client = oauth2.NewClient(ctx, oauth2.StaticTokenSource(
+			&oauth2.Token{AccessToken: s.AccessToken},
+		))
+	}
 
 	var v3 *github.Client
 	if s.V3Endpoint != "" {

go.mod

@@ -1,17 +1,15 @@
 module github.com/telia-oss/github-pr-resource
 
 require (
+	github.com/bradleyfalzon/ghinstallation/v2 v2.1.0
 	github.com/golang/protobuf v1.4.0 // indirect
 	github.com/google/go-github/v28 v28.1.1
 	github.com/maxbrunsfeld/counterfeiter/v6 v6.2.3
 	github.com/shurcooL/githubv4 v0.0.0-20200414012201-bbc966b061dd
 	github.com/shurcooL/graphql v0.0.0-20181231061246-d48a9a75455f // indirect
 	github.com/stretchr/testify v1.3.0
-	golang.org/x/crypto v0.0.0-20200423211502-4bdfaf469ed5 // indirect
-	golang.org/x/net v0.0.0-20200421231249-e086a090c8fd // indirect
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
 	golang.org/x/tools v0.0.0-20200423205358-59e73619c742 // indirect
-	google.golang.org/appengine v1.6.6 // indirect
 )
 
-go 1.14
+go 1.16

go.sum

@@ -1,11 +1,14 @@
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@@ -14,32 +17,31 @@ github.com/golang/protobuf v1.4.0 h1:oOuy+ugB+P/kBdUnG5QaMXSIyJ1q38wWSojYCb3z5VQ
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@@ -51,12 +53,10 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
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-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
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@@ -69,31 +69,29 @@ golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR
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-golang.org/x/tools v0.0.0-20200301222351-066e0c02454c h1:FD7jysxM+EJqg5UYYy3XYDsAiUickFsn4UiaanJkf8c=
 golang.org/x/tools v0.0.0-20200301222351-066e0c02454c/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20200423205358-59e73619c742 h1:9OGWpORUXvk8AsaBJlpzzDx7Srv/rSK6rvjcsJq4rJo=
 golang.org/x/tools v0.0.0-20200423205358-59e73619c742/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
@@ -103,21 +101,17 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IV
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
-google.golang.org/appengine v1.6.6 h1:lMO5rYAqUxkmaj76jAkRUvt5JZgFymx/+Q5Mzfivuhc=
-google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
+google.golang.org/appengine v1.6.7 h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=
+google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0 h1:qdOKuR/EIArgaWNjetjgTzgVTAZ+S/WXVrq9HW9zimw=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

models.go

@@ -27,12 +27,28 @@ type Source struct {
 	RequiredReviewApprovals int                         `json:"required_review_approvals"`
 	Labels                  []string                    `json:"labels"`
 	States                  []githubv4.PullRequestState `json:"states"`
+	UseGitHubApp            bool                        `json:"use_github_app"`
+	PrivateKey              string                      `json:"private_key"`
+	PrivateKeyFile          string                      `json:"private_key_file"`
+	ApplicationID           int64                       `json:"application_id"`
+	InstallationID          int64                       `json:"installation_id"`
 }
 
 // Validate the source configuration.
 func (s *Source) Validate() error {
-	if s.AccessToken == "" {
-		return errors.New("access_token must be set")
+	if s.AccessToken == "" && !s.UseGitHubApp {
+		return errors.New("access_token must be set if not using GitHub App authentication")
+	}
+	if s.UseGitHubApp {
+		if s.PrivateKey == "" && s.PrivateKeyFile == "" {
+			return errors.New("Either private_key or private_key_file should be supplied if using GitHub App authentication")
+		}
+		if s.ApplicationID == 0 || s.InstallationID == 0 {
+			return errors.New("application_id and installation_id must be set if using GitHub App authentication")
+		}
+		if s.AccessToken != "" {
+			return errors.New("access_token is not required when using GitHub App authentication")
+		}
 	}
 	if s.Repository == "" {
 		return errors.New("repository must be set")