/
ping.go
51 lines (40 loc) · 1.2 KB
/
ping.go
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/*
Copyright 2018 Google LLC
Copyright 2022 David Gageot
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package handlers
import (
"net/http"
"net/url"
)
// Ping does http HEAD on a URL and returns its status.
func Ping(w http.ResponseWriter, r *http.Request) {
// No need to ping when in grid view mode.
if isGridView(r.Referer()) {
return
}
url := r.FormValue("url")
resp, err := http.Head(url)
if err != nil {
http.Error(w, "Unable to ping", http.StatusInternalServerError)
return
}
defer resp.Body.Close()
w.WriteHeader(resp.StatusCode)
}
func isGridView(referer string) bool {
refererURL, err := url.Parse(referer)
if err != nil {
return false // Silently ignore
}
return refererURL.Query().Get("grid") == "true"
}