Want to generate oauth signature in dart? Use the following example code to generate oauth signature in dart.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 | import 'dart:async'; import 'dart:convert'; import 'dart:math'; import 'package:http/http.dart' as http; import 'package:convert/convert.dart'; import 'package:crypto/crypto.dart'; // TwitterApi class adapted from DanTup: // https://blog.dantup.com/2017/01/simplest-dart-code-to-post-a-tweet-using-oauth/ class FatSecretApi { final String fatSecretApiBaseUrl = "platform.fatsecret.com"; bool isJson = true; final String consumerKey, consumerKeySecret, accessToken, accessTokenSecret; Hmac _sigHasher; FatSecretApi(this.consumerKey, this.consumerKeySecret, this.accessToken, this.accessTokenSecret) { var bytes = utf8.encode("$consumerKeySecret&$accessTokenSecret"); _sigHasher = new Hmac(sha1, bytes); } FatSecretApi forceXml() { this.isJson = false; return this; } /// Sends a tweet with the supplied text and returns the response from the Twitter API. Future<http.Response> request(Map<String, String> data) { if (isJson) { data["format"] = "json"; } return _callGetApi("rest/server.api", data); } Future<http.Response> _callGetApi(String url, Map<String, String> data) { Uri requestUrl = Uri.https(fatSecretApiBaseUrl, url); print(data["method"]); _setAuthParams("GET", requestUrl.toString(), data); requestUrl = Uri.https(requestUrl.authority, requestUrl.path, data); String oAuthHeader = _generateOAuthHeader(data); // Build the OAuth HTTP Header from the data. // Build the form data (exclude OAuth stuff that's already in the header). // var formData = _filterMap(data, (k) => !k.startsWith("oauth_")); return _sendGetRequest(requestUrl, oAuthHeader); } void _setAuthParams(String requestMethod, String url, Map<String, String> data) { // Timestamps are in seconds since 1/1/1970. // var timestamp = new DateTime.now().toUtc().difference(_epochUtc).inSeconds; var millisecondsSinceEpoch = new DateTime.now().toUtc().millisecondsSinceEpoch; var timestamp = (millisecondsSinceEpoch / 100).round(); // Add all the OAuth headers we'll need to use when constructing the hash. data["oauth_consumer_key"] = consumerKey; data["oauth_signature_method"] = "HMAC-SHA1"; data["oauth_timestamp"] = timestamp.toString(); data["oauth_nonce"] = _randomString(8); // Required, but Twitter doesn't appear to use it if (accessToken != null && accessToken.isNotEmpty) data["oauth_token"] = accessToken; data["oauth_version"] = "1.0"; // Generate the OAuth signature and add it to our payload. data["oauth_signature"] = _generateSignature(requestMethod, Uri.parse(url), data); } /// Generate an OAuth signature from OAuth header values. String _generateSignature(String requestMethod, Uri url, Map<String, String> data) { var sigString = _toQueryString(data); var fullSigData = "$requestMethod&${_encode(url.toString())}&${_encode(sigString)}"; return base64.encode(_hash(fullSigData)); } /// Generate the raw OAuth HTML header from the values (including signature). String _generateOAuthHeader(Map<String, String> data) { var oauthHeaderValues = _filterMap(data, (k) => k.startsWith("oauth_")); return "OAuth " + _toOAuthHeader(oauthHeaderValues); } /// Send HTTP Request and return the response. Future<http.Response> _sendGetRequest(Uri fullUrl, String oAuthHeader) async { return await http.get(fullUrl, headers: { }); } Map<String, String> _filterMap( Map<String, String> map, bool test(String key)) { return new Map.fromIterable(map.keys.where(test), value: (k) => map[k]); } String _toQueryString(Map<String, String> data) { var items = data.keys.map((k) => "$k=${_encode(data[k])}").toList(); items.sort(); return items.join("&"); } String _toOAuthHeader(Map<String, String> data) { var items = data.keys.map((k) => "$k=\"${_encode(data[k])}\"").toList(); items.sort(); return items.join(", "); } List<int> _hash(String data) => _sigHasher.convert(data.codeUnits).bytes; String _encode(String data) => percent.encode(data.codeUnits); String _randomString(int length) { var rand = new Random(); var codeUnits = new List.generate( length, (index){ return rand.nextInt(26)+97; } ); return new String.fromCharCodes(codeUnits); } } |
If you like this question & answer and want to contribute, then write your question & answer and email to freewebmentor[@]gmail.com. Your question and answer will appear on FreeWebMentor.com and help other developers.
