CODEWITHSUNDEEP
flutterdarthmacsha1
Tai-sung Wang
Tai-sung Wang

Reputation: 73

Flutter/Dart HMAC-SHA1 encoding, and then request web api with header

I want to get a web API. The web request using HMAC-SHA1 encoding.Just like below: enter image description here

Following is my code:

getData(){
  String APPID = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF";
  String APPKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXX";

  final String time = readTimestamp(DateTime.now().millisecondsSinceEpoch);
  final signDate = "x-date: $time";
  var key = utf8.encode(APPKey);
  var hmacSha1 = new Hmac(sha1, key);
  var hmac = hmacSha1.convert(utf8.encode(signDate));
  var base64HmacString = Base64Encoder().convert(hmac.bytes);

  var bytes = utf8.encode(""""hmac username=$APPID, algorithm="hmac-sha1", headers="x-date", signature=$base64HmacString""");
  var digest = hmacSha1.convert(bytes);
  visitAPI(time, '$digest');
}

String readTimestamp(int timestamp){
  var format = new DateFormat("EEE, dd MMM yyyy HH:mm:ss");
  var time = format.format(DateTime.now().toUtc()) + " GMT";

  print(time.toString());
  return time.toString();
}

Future<void> visitAPI(String xdate, String authorization) async {
  final url = "https://ptx.transportdata.tw/MOTC/v2/Bus/RealTimeByFrequency/Streaming/City/Hsinchu?\$top=30&\$format=JSON";
  final response = await http.get(url,
      headers: {"x-date": xdate, "Authorization": authorization});
  final jsonSt = json.decode(response.body);
  print(response.body);
}

I have tried many time but I still got the message:"HMAC signature cannot be verified". Is there any problem on my code? Please help me. Thanks.

Upvotes: 0

Views: 1117

Answers (0)

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