Created
October 16, 2020 14:46
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| package main | |
| import ( | |
| "fmt" | |
| "net/http" | |
| "net/http/httputil" | |
| "net/url" | |
| "os" | |
| ) | |
| func getEnv(key, fallback string) string { | |
| if value, ok := os.LookupEnv(key); ok { | |
| return value | |
| } | |
| return fallback | |
| } | |
| func getListenAddress() string { | |
| port := getEnv("PORT", "1338") | |
| return ":" + port | |
| } | |
| func getFCMToken() string { | |
| token := getEnv("FCM_TOKEN", | |
| "token_token_token_token_token_token_token_token") | |
| return token | |
| } | |
| func serveReverseProxy(target string, res http.ResponseWriter, req *http.Request) { | |
| fcmUrl, _ := url.Parse(target) | |
| proxy := httputil.NewSingleHostReverseProxy(fcmUrl) | |
| req.URL.Host = fcmUrl.Host | |
| req.URL.Scheme = fcmUrl.Scheme | |
| req.Header.Set("X-Forwarded-Host", req.Header.Get("Host")) | |
| req.Header.Set("Authorization", "key="+getFCMToken()) | |
| req.Host = fcmUrl.Host | |
| proxy.ServeHTTP(res, req) | |
| } | |
| func handleRequestAndRedirect(res http.ResponseWriter, req *http.Request) { | |
| fmt.Println(req.Header.Get("Authorization"))//todo magic | |
| serveReverseProxy("https://fcm.googleapis.com", res, req) | |
| } | |
| func main() { | |
| http.HandleFunc("/", handleRequestAndRedirect) | |
| if err := http.ListenAndServe(getListenAddress(), nil); err != nil { | |
| fmt.Println("HTTP Server", err.Error()) | |
| } | |
| } |
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