url-encode.h

/* MIT License
 * 
 * Copyright (c) 2022 Masayuki Sugahara
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE. 
 */
#ifndef URL_ENCODE_H
#define URL_ENCODE_H

#include <WString.h>

String urlEncode(const char *msg) {
  const char *hex = "0123456789ABCDEF";
  String encodedMsg = "";

  while (*msg != '\0') {
    if (
        ('a' <= *msg && *msg <= 'z') || ('A' <= *msg && *msg <= 'Z') || ('0' <= *msg && *msg <= '9') || *msg == '-' || *msg == '_' || *msg == '.' || *msg == '~') {
      encodedMsg += *msg;
    } else {
      encodedMsg += '%';
      encodedMsg += hex[(unsigned char)*msg >> 4];
      encodedMsg += hex[*msg & 0xf];
    }
    msg++;
  }
  return encodedMsg;
}

String urlEncode(String msg) {
  return urlEncode(msg.c_str());
}

#endif // URL_ENCODE_H