package graphiql
import (
"html/template"
"net/http"
"net/url"
)
var page = template.Must(template.New("graphiql").Parse(`
{{.title}}
Loading...
`))
// Handler responsible for setting up the playground
func Handler(title string, endpoint string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "text/html; charset=UTF-8")
err := page.Execute(w, map[string]interface{}{
"title": title,
"endpoint": endpoint,
"endpointIsAbsolute": endpointHasScheme(endpoint),
"subscriptionEndpoint": getSubscriptionEndpoint(endpoint),
"version": "2.4.1",
"reactVersion": "17.0.2",
"cssSRI": "sha256-bGeEsMhcAqeXBjh2w0eQzBTFAxwlxhM0PKIKqMshlnk=",
"jsSRI": "sha256-s+f7CFAPSUIygFnRC2nfoiEKd3liCUy+snSdYFAoLUc=",
"reactSRI": "sha256-Ipu/TQ50iCCVZBUsZyNJfxrDk0E2yhaEIz0vqI+kFG8=",
"reactDOMSRI": "sha256-nbMykgB6tsOFJ7OdVmPpdqMFVk4ZsqWocT6issAPUF0=",
})
if err != nil {
panic(err)
}
}
}
// endpointHasScheme checks if the endpoint has a scheme.
func endpointHasScheme(endpoint string) bool {
u, err := url.Parse(endpoint)
return err == nil && u.Scheme != ""
}
// getSubscriptionEndpoint returns the subscription endpoint for the given
// endpoint if it is parsable as a URL, or an empty string.
func getSubscriptionEndpoint(endpoint string) string {
u, err := url.Parse(endpoint)
if err != nil {
return ""
}
switch u.Scheme {
case "https":
u.Scheme = "wss"
default:
u.Scheme = "ws"
}
return u.String()
}