func ExtractTopicFromRequestPath()

in internal/events/pubsub/pubsub.go [50:63]

• 11 lines of code
• 2 McCabe index (conditional complexity)

func ExtractTopicFromRequestPath(path string) (string, error) {
	re := regexp.MustCompile(`(projects\/[^/?]+\/topics\/[^/?]+)/*`)
	matches := re.FindStringSubmatch(path)
	if matches == nil {
		// Prevent log injection by removing newline characters in path
		replacer := strings.NewReplacer("\n", "", "\r", "")
		escapedPath := replacer.Replace(path)
		return "", fmt.Errorf("failed to extract Pub/Sub topic name from the URL request path: %q, configure your subscription's push endpoint to use the following path pattern: 'projects/PROJECT_NAME/topics/TOPIC_NAME'",
			escapedPath)
	}

	// Index 0 is the entire input string matched, index 1 is the first submatch
	return matches[1], nil
}