fix(controller): support parsing github enterprise urls

internal/gitprovider/github/github.go

@@ -4,7 +4,6 @@
 	"context"
 	"fmt"
 	"net/url"
-	"regexp"
 	"strings"
 
 	"github.com/google/go-github/v56/github"
@@ -146,13 +145,18 @@
 	}
 }
 
-func parseGitHubURL(u string) (string, string, error) {
-	regex := regexp.MustCompile(`^https\://github\.com/([\w-]+)/([\w-]+).*`)
-	parts := regex.FindStringSubmatch(u)
-	if len(parts) != 3 {
-		return "", "", fmt.Errorf("error parsing github repository URL %q", u)
+func parseGitHubURL(repoURL string) (string, string, error) {
+	u, err := url.Parse(repoURL)
+	if err != nil {
+		return "", "", fmt.Errorf("error parsing github repository URL %q: %w", u, err)
+	}
+	path := strings.TrimPrefix(u.Path, "/")
+	path = strings.TrimSuffix(path, ".git")
+	parts := strings.Split(path, "/")
+	if len(parts) != 2 {
+		return "", "", fmt.Errorf("could not parse github repository URL %q", u)
 	}
-	return parts[1], parts[2], nil
+	return parts[0], parts[1], nil
 }
 
 func (g *GitHubProvider) IsPullRequestMerged(ctx context.Context, repoURL string, id int64) (bool, error) {

internal/gitprovider/github/github_test.go

@@ -0,0 +1,54 @@
+package github
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseGitHubURL(t *testing.T) {
+	testCases := []struct {
+		url           string
+		expectedOwner string
+		expectedRepo  string
+		errExpected   bool
+	}{
+		{
+			url:         "not-a-url",
+			errExpected: true,
+		},
+		{
+			url:         "https://github.com/akuity",
+			errExpected: true,
+		},
+		{
+			url:           "https://github.com/akuity/kargo",
+			expectedOwner: "akuity",
+			expectedRepo:  "kargo",
+		},
+		{
+			url:           "https://github.com/akuity/kargo.git",
+			expectedOwner: "akuity",
+			expectedRepo:  "kargo",
+		},
+		{
+			// This isn't a real URL. It's just to validate that the function can
+			// handle GitHub Enterprise URLs.
+			url:           "https://github.akuity.io/akuity/kargo.git",
+			expectedOwner: "akuity",
+			expectedRepo:  "kargo",
+		},
+	}
+	for _, testCase := range testCases {
+		t.Run(testCase.url, func(t *testing.T) {
+			owner, repo, err := parseGitHubURL(testCase.url)
+			if testCase.errExpected {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+				require.Equal(t, testCase.expectedOwner, owner)
+				require.Equal(t, testCase.expectedRepo, repo)
+			}
+		})
+	}
+}