Added support for GitHub App auth

Signed-off-by: Andrew Block <andy.block@gmail.com>

Author: sabre1041

go.mod

@@ -6,6 +6,7 @@ require (
 	code.gitea.io/sdk/gitea v0.22.1
 	github.com/Masterminds/semver/v3 v3.4.0
 	github.com/argoproj-labs/argocd-operator v0.15.0
+	github.com/bradleyfalzon/ghinstallation/v2 v2.17.0
 	github.com/go-errors/errors v1.5.1
 	github.com/go-git/go-git/v5 v5.16.4
 	github.com/go-logr/logr v1.4.3
@@ -51,7 +52,6 @@ require (
 	github.com/bmatcuk/doublestar/v4 v4.9.1 // indirect
 	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect
 	github.com/bombsimon/logrusr/v4 v4.1.0 // indirect
-	github.com/bradleyfalzon/ghinstallation/v2 v2.17.0 // indirect
 	github.com/casbin/casbin/v2 v2.127.0 // indirect
 	github.com/casbin/govaluate v1.10.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect

hack/build.sh

@@ -5,7 +5,7 @@ GIT_VERSION=$(git describe --always --tags || true)
 VERSION=${CI_UPSTREAM_VERSION:-${GIT_VERSION}}
 GIT_COMMIT=$(git rev-list -1 HEAD || true)
 COMMIT=${CI_UPSTREAM_COMMIT:-${GIT_COMMIT}}
-BUILD_DATE=$(date --utc -Iseconds)
+BUILD_DATE=$(TZ=UTC date -Iseconds)
 
 LDFLAGS="-s -w "
 REPO="github.com/hybrid-cloud-patterns/patterns-operator"

internal/controller/checkout.go

@@ -17,11 +17,13 @@ limitations under the License.
 package controllers
 
 import (
+	"context"
 	"fmt"
 	nethttp "net/http"
 	"os"
 	"regexp"
 	"strings"
+	"time"
 
 	"path/filepath"
 
@@ -35,15 +37,18 @@ import (
 	"github.com/go-git/go-git/v5/plumbing/transport/http"
 	"github.com/go-git/go-git/v5/plumbing/transport/ssh"
 
+	"github.com/bradleyfalzon/ghinstallation/v2"
+
 	argogit "github.com/argoproj/argo-cd/v3/util/git"
 )
 
 type GitAuthenticationBackend uint
 
 const (
-	GitAuthNone     GitAuthenticationBackend = 0
-	GitAuthPassword GitAuthenticationBackend = 1
-	GitAuthSsh      GitAuthenticationBackend = 2
+	GitAuthNone      GitAuthenticationBackend = 0
+	GitAuthPassword  GitAuthenticationBackend = 1
+	GitAuthSsh       GitAuthenticationBackend = 2
+	GitAuthGitHubApp GitAuthenticationBackend = 3
 )
 
 const GitCustomCAFile = "/tmp/vp-git-cas.pem"
@@ -176,7 +181,7 @@ func checkoutRevision(fullClient kubernetes.Interface, gitOps GitOperations, url
 	if repo == nil { // we mocked the above OpenRepository
 		return nil
 	}
-	foptions, err := getFetchOptions(url, secret)
+	foptions, err := getFetchOptions(fullClient, url, secret)
 	if err != nil {
 		return err
 	}
@@ -235,7 +240,7 @@ func cloneRepo(fullClient kubernetes.Interface, gitOps GitOperations, url, direc
 	}
 	fmt.Printf("git clone %s into %s\n", url, directory)
 
-	options, err := getCloneOptions(url, secret)
+	options, err := getCloneOptions(fullClient, url, secret)
 	if err != nil {
 		return err
 	}
@@ -259,7 +264,7 @@ func cloneRepo(fullClient kubernetes.Interface, gitOps GitOperations, url, direc
 	return nil
 }
 
-func getFetchOptions(url string, secret map[string][]byte) (*git.FetchOptions, error) {
+func getFetchOptions(fullClient kubernetes.Interface, url string, secret map[string][]byte) (*git.FetchOptions, error) {
 	var foptions = &git.FetchOptions{
 		RemoteName:      "origin",
 		Force:           true,
@@ -275,12 +280,19 @@ func getFetchOptions(url string, secret map[string][]byte) (*git.FetchOptions, e
 			return nil, err
 		}
 		foptions.Auth = publicKey
+	case GitAuthGitHubApp:
+		gitHubAppAuth, err := getGitHubAppAuth(fullClient, secret)
+		if err != nil {
+			return nil, err
+		}
+
+		foptions.Auth = gitHubAppAuth
 	}
 
 	return foptions, nil
 }
 
-func getCloneOptions(url string, secret map[string][]byte) (*git.CloneOptions, error) {
+func getCloneOptions(fullClient kubernetes.Interface, url string, secret map[string][]byte) (*git.CloneOptions, error) {
 	// Clone the given repository to the given directory
 	var options = &git.CloneOptions{
 		URL:          url,
@@ -300,6 +312,13 @@ func getCloneOptions(url string, secret map[string][]byte) (*git.CloneOptions, e
 			return nil, err
 		}
 		options.Auth = publicKey
+	case GitAuthGitHubApp:
+		gitHubAppAuth, err := getGitHubAppAuth(fullClient, secret)
+		if err != nil {
+			return nil, err
+		}
+
+		options.Auth = gitHubAppAuth
 	}
 
 	return options, nil
@@ -333,6 +352,55 @@ func getSshPublicKey(url string, secret map[string][]byte) (*ssh.PublicKeys, err
 	return publicKey, nil
 }
 
+func getGitHubAppAuth(fullClient kubernetes.Interface, secret map[string][]byte) (*http.BasicAuth, error) {
+
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	baseURL := "https://api.github.com"
+
+	if githubAppEnterpriseBaseUrl := getField(secret, "username"); githubAppEnterpriseBaseUrl != nil {
+		baseURL = strings.TrimSuffix(string(githubAppEnterpriseBaseUrl), "/")
+	}
+
+	transport := getHTTPSTransport(fullClient)
+
+	githubAppID, err := IntOrZero(secret, "githubAppID")
+	if err != nil {
+		return nil, err
+	}
+
+	githubAppInstallationID, err := IntOrZero(secret, "githubAppInstallationID")
+	if err != nil {
+		return nil, err
+	}
+
+	itr, err := ghinstallation.New(transport,
+		githubAppID,
+		githubAppInstallationID,
+		getField(secret, "githubAppPrivateKey"),
+	)
+
+	if err != nil {
+		return nil, fmt.Errorf("failed to initialize GitHub installation transport: %w", err)
+	}
+
+	itr.BaseURL = baseURL
+
+	accessToken, err := itr.Token(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("could not get GitHub App installation token: %w", err)
+	}
+
+	auth := &http.BasicAuth{
+		Username: "x-access-token",
+		Password: accessToken,
+	}
+
+	return auth, nil
+
+}
+
 // This returns the user prefix in git urls like:
 // git@github.com:/foo/bar or "" when not found
 func getUserFromURL(url string) string {
@@ -362,14 +430,27 @@ func repoHash(directory string) (string, error) {
 // if a secret has
 // returns "" if a secret could not be parse, "ssh" if it is an ssh auth, and "password" if a username + pass auth
 func detectGitAuthType(secret map[string][]byte) GitAuthenticationBackend {
+	// SSH
 	if _, ok := secret["sshPrivateKey"]; ok {
 		return GitAuthSsh
 	}
+
+	// Username + Password
 	_, hasUser := secret["username"]
 	_, hasPassword := secret["password"]
 	if hasUser && hasPassword {
 		return GitAuthPassword
 	}
+
+	// GitHub App
+	_, hasGithubAppID := secret["githubAppID"]
+	_, hasGithubAppInstallationID := secret["githubAppInstallationID"]
+	_, hasGithubAppPrivateKey := secret["githubAppPrivateKey"]
+	if hasGithubAppID && hasGithubAppInstallationID && hasGithubAppPrivateKey {
+		return GitAuthGitHubApp
+	}
+
+	// None
 	return GitAuthNone
 }
 

internal/controller/utils.go

@@ -27,6 +27,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 
 	"crypto/rand"
@@ -404,3 +405,13 @@ func IsCommonSlimmed(patternPath string) bool {
 	}
 	return true
 }
+
+// IntOrZero retrieves an integer value from a map by key.
+func IntOrZero(secret map[string][]byte, key string) (int64, error) {
+	val, present := secret[key]
+	if !present {
+		return 0, nil
+	}
+
+	return strconv.ParseInt(string(val), 10, 64)
+}