Ffeldberg/rel 4888/support enterprise instances (#147)

Adding support for instantiating a github enterprise client if the PR we
are checking isn't in a regular GH account.

Also adds some safety for nil pointer references and a fallback value
for required flag link values.

---------

Co-authored-by: collinmurd <collinmurdock22@gmail.com>

Author: monsagri

CHANGELOG.md

@@ -2,10 +2,14 @@
 
 ### Added
 
+- Add support for enterprise hosted github instances [More info](https://github.com/launchdarkly/find-code-references-in-pull-request/issues/102)
+
 ### Changed
 
 ### Fixed
 
+ - Potential null pointer error when creating flag links
+
 ## 2.0.2
 
 ### Changed

config/config.go

@@ -98,14 +98,27 @@ func ValidateInputandParse(ctx context.Context) (*Config, error) {
 		config.CreateFlagLinks = createFlagLinks
 	}
 
-	config.GHClient = getGithubClient(ctx)
+	client, err := getGithubClient(ctx)
+	if err != nil {
+		return nil, err
+	}
+	config.GHClient = client
+
 	return &config, nil
 }
 
-func getGithubClient(ctx context.Context) *github.Client {
+func getGithubClient(ctx context.Context) (*github.Client, error) {
 	ts := oauth2.StaticTokenSource(
 		&oauth2.Token{AccessToken: os.Getenv("GITHUB_TOKEN")},
 	)
 	tc := oauth2.NewClient(ctx, ts)
-	return github.NewClient(tc)
+	gc := github.NewClient(tc)
+
+	host := os.Getenv("GITHUB_SERVER_URL")
+	if host != "https://github.com" && host != "" {
+		gha.Log("Using GitHub Enterprise host. baseUrl: %s, uploadUrl: %s", host+"/api/v3/", host+"/api/uploads/")
+		return gc.WithEnterpriseURLs(host+"/api/v3/", host+"/api/uploads/")
+	}
+
+	return gc, nil
 }

internal/ldclient/flag_links.go

@@ -14,6 +14,7 @@ import (
 	ldapi "github.com/launchdarkly/api-client-go/v15"
 	lcr "github.com/launchdarkly/find-code-references-in-pull-request/config"
 	gha "github.com/launchdarkly/find-code-references-in-pull-request/internal/github_actions"
+	"github.com/launchdarkly/find-code-references-in-pull-request/internal/utils"
 	"github.com/launchdarkly/find-code-references-in-pull-request/internal/version"
 
 	flags "github.com/launchdarkly/find-code-references-in-pull-request/internal/references"
@@ -101,23 +102,24 @@ func makeFlagLinkRep(event *github.PullRequestEvent, flagKey, message string) *l
 		return nil
 	}
 
+	authorLogin := utils.SafeString(pr.User.Login)
 	metadata := map[string]string{
 		"message":   message,
 		"prNumber":  strconv.Itoa(*pr.Number),
-		"prTitle":   *pr.Title,
-		"prBody":    *pr.Body,
-		"state":     *pr.State,
-		"avatarUrl": *pr.User.AvatarURL,
-		"repoName":  *event.Repo.FullName,
-		"repoUrl":   *event.Repo.HTMLURL,
+		"prTitle":   utils.SafeString(pr.Title),
+		"prBody":    utils.SafeString(pr.Body),
+		"state":     utils.SafeString(pr.State),
+		"avatarUrl": utils.SafeString(pr.User.AvatarURL),
+		"repoName":  utils.SafeString(event.Repo.FullName),
+		"repoUrl":   utils.SafeString(event.Repo.HTMLURL),
 	}
 
 	if pr.User.Name != nil {
-		metadata["authorName"] = *pr.User.Name
-		metadata["authorDisplayName"] = *pr.User.Name
+		metadata["authorName"] = utils.SafeString(pr.User.Name)
+		metadata["authorDisplayName"] = utils.SafeString(pr.User.Name)
 	} else {
-		metadata["authorDisplayName"] = *pr.User.Login
-		metadata["authorLogin"] = *pr.User.Login
+		metadata["authorDisplayName"] = authorLogin
+		metadata["authorLogin"] = authorLogin
 	}
 
 	var timestamp *int64
@@ -131,25 +133,30 @@ func makeFlagLinkRep(event *github.PullRequestEvent, flagKey, message string) *l
 	// key must be unique
 	key := fmt.Sprintf("github-pr-%s-%s", id, flagKey)
 
+	description := utils.SafeString(pr.Body)
+	// Flag links require a description
+	if description == "" {
+		description = "Empty PR Body"
+	}
 	return &ldapi.FlagLinkPost{
 		DeepLink:       pr.HTMLURL,
 		Key:            &key,
 		IntegrationKey: &integration,
 		Timestamp:      timestamp,
 		Title:          getLinkTitle(event),
-		Description:    pr.Body,
+		Description:    &description,
 		Metadata:       &metadata,
 	}
 }
 
 func getLinkTitle(event *github.PullRequestEvent) *string {
 	builder := new(strings.Builder)
-	builder.WriteString(fmt.Sprintf("[%s]", *event.Repo.FullName))
+	builder.WriteString(fmt.Sprintf("[%s]", utils.SafeString(event.Repo.FullName)))
 
 	pr := event.PullRequest
 	if pr.Title != nil {
 		builder.WriteString(" ")
-		builder.WriteString(*pr.Title)
+		builder.WriteString(utils.SafeString(pr.Title))
 		if pr.Number != nil {
 			builder.WriteString(fmt.Sprintf(" (#%d)", *pr.Number))
 		}

internal/utils/utils.go

@@ -14,3 +14,10 @@ func Dedupe(s []string) []string {
 	}
 	return ret
 }
+
+func SafeString(s *string) string {
+	if s != nil {
+		return *s
+	}
+	return ""
+}

internal/version/version.go

@@ -1,3 +1,3 @@
 package version
 
-const Version = "2.0.2"
+const Version = "2.0.3-alpha"

testdata/test

@@ -5,4 +5,4 @@ show-widgets
 show_widgets
 mobile-app-promo-ios
 mobile-app-promo-ios
-beta-ui
+beta-ui