forked from 99designs/gqlgen
/
playground.go
119 lines (108 loc) · 3.1 KB
/
playground.go
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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@17.0.2/umd/react.production.min.js"
integrity="{{.reactSRI}}"
crossorigin="anonymous"
></script>
<script
src="https://cdn.jsdelivr.net/npm/react-dom@17.0.2/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}}
const fetcher = GraphiQL.createFetcher({ url, subscriptionUrl });
ReactDOM.render(
React.createElement(GraphiQL, {
fetcher: fetcher,
isHeadersEditorEnabled: true,
shouldPersistHeaders: true
}),
document.getElementById('graphiql'),
);
</script>
</body>
</html>
`))
// 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": "2.0.7",
"cssSRI": "sha256-gQryfbGYeYFxnJYnfPStPYFt0+uv8RP8Dm++eh00G9c=",
"jsSRI": "sha256-qQ6pw7LwTLC+GfzN+cJsYXfVWRKH9O5o7+5H96gTJhQ=",
"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()
}