package handler
import (
"encoding/json"
"html/template"
"net/http"
"github.com/graphql-go/graphql"
)
// page is the page data structure of the rendered GraphiQL page
type graphiqlPage struct {
GraphiqlVersion string
QueryString string
ResultString string
VariablesString string
OperationName string
}
// renderGraphiQL renders the GraphiQL GUI
func renderGraphiQL(w http.ResponseWriter, params graphql.Params) {
t := template.New("GraphiQL")
t, err := t.Parse(graphiqlTemplate)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Create variables string
vars, err := json.MarshalIndent(params.VariableValues, "", " ")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
varsString := string(vars)
if varsString == "null" {
varsString = ""
}
// Create result string
var resString string
if params.RequestString == "" {
resString = ""
} else {
result, err := json.MarshalIndent(graphql.Do(params), "", " ")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
resString = string(result)
}
p := graphiqlPage{
GraphiqlVersion: graphiqlVersion,
QueryString: params.RequestString,
ResultString: resString,
VariablesString: varsString,
OperationName: params.OperationName,
}
err = t.ExecuteTemplate(w, "index", p)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
return
}
// graphiqlVersion is the current version of GraphiQL
const graphiqlVersion = "0.11.3"
// tmpl is the page template to render GraphiQL
const graphiqlTemplate = `
{{ define "index" }}
GraphiQL
{{ end }}
`