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package middleware
import "net/http"
func CORS(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
writeMethods(w, r)
writeOrigins(w, r)
writeHeaders(w)
next.ServeHTTP(w, r)
})
}
func writeMethods(responseWriter http.ResponseWriter, request *http.Request) {
method := request.Header.Get("Access-Control-Request-Method")
if isPreflight(request) {
responseWriter.Header().Add("Access-Control-Allow-Methods", method)
}
}
func writeOrigins(responseWriter http.ResponseWriter, request *http.Request) {
origin := request.Header.Get("Origin")
if origin == "http://localhost:5173" {
responseWriter.Header().Add("Access-Control-Allow-Origin", origin)
}
}
func writeHeaders(responseWriter http.ResponseWriter) {
responseWriter.Header().Add("Access-Control-Allow-Headers", "*")
}
func isPreflight(request *http.Request) bool {
return request.Method == "OPTIONS" &&
request.Header.Get("Origin") != "" &&
request.Header.Get("Access-Control-Request-Method") != ""
}
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