graphql/playground/playground.go (123 lines of code) (raw):
package playground
import (
"html/template"
"net/http"
"net/url"
)
var page = template.Must(template.New("graphiql").Parse(`<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>{{.title}}</title>
<style>
body {
height: 100%;
margin: 0;
width: 100%;
overflow: hidden;
}
#graphiql {
height: 100vh;
}
</style>
<script
src="https://cdn.jsdelivr.net/npm/react@18.2.0/umd/react.production.min.js"
integrity="{{.reactSRI}}"
crossorigin="anonymous"
></script>
<script
src="https://cdn.jsdelivr.net/npm/react-dom@18.2.0/umd/react-dom.production.min.js"
integrity="{{.reactDOMSRI}}"
crossorigin="anonymous"
></script>
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/graphiql@{{.version}}/graphiql.min.css"
integrity="{{.cssSRI}}"
crossorigin="anonymous"
/>
</head>
<body>
<div id="graphiql">Loading...</div>
<script
src="https://cdn.jsdelivr.net/npm/graphiql@{{.version}}/graphiql.min.js"
integrity="{{.jsSRI}}"
crossorigin="anonymous"
></script>
<script>
{{- if .endpointIsAbsolute}}
const url = {{.endpoint}};
const subscriptionUrl = {{.subscriptionEndpoint}};
{{- else}}
const url = location.protocol + '//' + location.host + {{.endpoint}};
const wsProto = location.protocol == 'https:' ? 'wss:' : 'ws:';
const subscriptionUrl = wsProto + '//' + location.host + {{.endpoint}};
{{- end}}
{{- if .fetcherHeaders}}
const fetcherHeaders = {{.fetcherHeaders}};
{{- else}}
const fetcherHeaders = undefined;
{{- end}}
{{- if .uiHeaders}}
const uiHeaders = {{.uiHeaders}};
{{- else}}
const uiHeaders = undefined;
{{- end}}
const fetcher = GraphiQL.createFetcher({ url, subscriptionUrl, headers: fetcherHeaders });
ReactDOM.render(
React.createElement(GraphiQL, {
fetcher: fetcher,
isHeadersEditorEnabled: true,
shouldPersistHeaders: true,
headers: JSON.stringify(uiHeaders, null, 2)
}),
document.getElementById('graphiql'),
);
</script>
</body>
</html>
`))
// Handler responsible for setting up the playground
func Handler(title, endpoint string) http.HandlerFunc {
return HandlerWithHeaders(title, endpoint, nil, nil)
}
// HandlerWithHeaders sets up the playground.
// fetcherHeaders are used by the playground's fetcher instance and will not be visible in the UI.
// uiHeaders are default headers that will show up in the UI headers editor.
func HandlerWithHeaders(
title, endpoint string,
fetcherHeaders, uiHeaders map[string]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]any{
"title": title,
"endpoint": endpoint,
"fetcherHeaders": fetcherHeaders,
"uiHeaders": uiHeaders,
"endpointIsAbsolute": endpointHasScheme(endpoint),
"subscriptionEndpoint": getSubscriptionEndpoint(endpoint),
"version": "3.7.0",
"cssSRI": "sha256-Dbkv2LUWis+0H4Z+IzxLBxM2ka1J133lSjqqtSu49o8=",
"jsSRI": "sha256-qsScAZytFdTAEOM8REpljROHu8DvdvxXBK7xhoq5XD0=",
"reactSRI": "sha256-S0lp+k7zWUMk2ixteM6HZvu8L9Eh//OVrt+ZfbCpmgY=",
"reactDOMSRI": "sha256-IXWO0ITNDjfnNXIu5POVfqlgYoop36bDzhodR6LW5Pc=",
})
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()
}