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package ghinstance
import (
"errors"
"fmt"
"strings"
)
// DefaultHostname is the domain name of the default GitHub instance.
const defaultHostname = "github.com"
// Localhost is the domain name of a local GitHub instance.
const localhost = "github.localhost"
// TenancyHost is the domain name of a tenancy GitHub instance.
const tenancyHost = "ghe.com"
// Default returns the host name of the default GitHub instance.
func Default() string {
return defaultHostname
}
// IsEnterprise reports whether a non-normalized host name looks like a GHE instance.
func IsEnterprise(h string) bool {
normalizedHostName := NormalizeHostname(h)
return normalizedHostName != defaultHostname && normalizedHostName != localhost
}
// IsTenancy reports whether a non-normalized host name looks like a tenancy instance.
func IsTenancy(h string) bool {
normalizedHostName := NormalizeHostname(h)
return strings.HasSuffix(normalizedHostName, "."+tenancyHost)
}
// TenantName extracts the tenant name from tenancy host name and
// reports whether it found the tenant name.
func TenantName(h string) (string, bool) {
normalizedHostName := NormalizeHostname(h)
return cutSuffix(normalizedHostName, "."+tenancyHost)
}
func isGarage(h string) bool {
return strings.EqualFold(h, "garage.github.com")
}
// NormalizeHostname returns the canonical host name of a GitHub instance.
func NormalizeHostname(h string) string {
hostname := strings.ToLower(h)
if strings.HasSuffix(hostname, "."+defaultHostname) {
return defaultHostname
}
if strings.HasSuffix(hostname, "."+localhost) {
return localhost
}
if before, found := cutSuffix(hostname, "."+tenancyHost); found {
idx := strings.LastIndex(before, ".")
return fmt.Sprintf("%s.%s", before[idx+1:], tenancyHost)
}
return hostname
}
func HostnameValidator(hostname string) error {
if len(strings.TrimSpace(hostname)) < 1 {
return errors.New("a value is required")
}
if strings.ContainsRune(hostname, '/') || strings.ContainsRune(hostname, ':') {
return errors.New("invalid hostname")
}
return nil
}
func GraphQLEndpoint(hostname string) string {
if isGarage(hostname) {
return fmt.Sprintf("https://%s/api/graphql", hostname)
}
if IsEnterprise(hostname) {
return fmt.Sprintf("https://%s/api/graphql", hostname)
}
if strings.EqualFold(hostname, localhost) {
return fmt.Sprintf("http://api.%s/graphql", hostname)
}
return fmt.Sprintf("https://api.%s/graphql", hostname)
}
func RESTPrefix(hostname string) string {
if isGarage(hostname) {
return fmt.Sprintf("https://%s/api/v3/", hostname)
}
if IsEnterprise(hostname) {
return fmt.Sprintf("https://%s/api/v3/", hostname)
}
if strings.EqualFold(hostname, localhost) {
return fmt.Sprintf("http://api.%s/", hostname)
}
return fmt.Sprintf("https://api.%s/", hostname)
}
func GistPrefix(hostname string) string {
prefix := "https://"
if strings.EqualFold(hostname, localhost) {
prefix = "http://"
}
return prefix + GistHost(hostname)
}
func GistHost(hostname string) string {
if isGarage(hostname) {
return fmt.Sprintf("%s/gist/", hostname)
}
if IsEnterprise(hostname) {
return fmt.Sprintf("%s/gist/", hostname)
}
if strings.EqualFold(hostname, localhost) {
return fmt.Sprintf("%s/gist/", hostname)
}
return fmt.Sprintf("gist.%s/", hostname)
}
func HostPrefix(hostname string) string {
if strings.EqualFold(hostname, localhost) {
return fmt.Sprintf("http://%s/", hostname)
}
return fmt.Sprintf("https://%s/", hostname)
}
// Backport strings.CutSuffix from Go 1.20.
func cutSuffix(s, suffix string) (string, bool) {
if !strings.HasSuffix(s, suffix) {
return s, false
}
return s[:len(s)-len(suffix)], true
}
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