这是最终工作的代码：
static String generateSignature(
String method, String base, List<String> sortedItems) {
String param = '';
for (int i = 0; i < sortedItems.length; i++) {
if (i == 0)
param = sortedItems[i];
else
param += '&${sortedItems[i]}';
}
String sig =
'$method&${Uri.encodeComponent(base)}&${Uri.encodeComponent(param)}';
String key =
'${Uri.encodeComponent(_secretKey)}&${Uri.encodeComponent(twitter.secret)}';
var digest = Hmac(sha1, utf8.encode(key)).convert(utf8.encode(sig));
return base64.encode(digest.bytes);
}
Twitter接听电话的便捷方法：
Future<http.Response> _twitterGet(
String base, List<List<String>> params) async {
if (twitter == null) await _startSession();
String oauthConsumer =
'oauth_consumer_key="${Uri.encodeComponent(_consumerKey)}"';
String oauthToken = 'oauth_token="${Uri.encodeComponent(twitter.token)}"';
String oauthNonce =
'oauth_nonce="${Uri.encodeComponent(randomAlphaNumeric(42))}"';
String oauthVersion = 'oauth_version="${Uri.encodeComponent("1.0")}"';
String oauthTime =
'oauth_timestamp="${(DateTime.Now().millisecondsSinceEpoch / 1000).toString()}"';
String oauthMethod =
'oauth_signature_method="${Uri.encodeComponent("HMAC-SHA1")}"';
var oauthList = [
oauthConsumer.replaceAll('"', ""),
oauthNonce.replaceAll('"', ""),
oauthMethod.replaceAll('"', ""),
oauthTime.replaceAll('"', ""),
oauthToken.replaceAll('"', ""),
oauthVersion.replaceAll('"', "")
];
var paramMap = Map<String, String>();
for (List<String> param in params) {
oauthList.add(
'${Uri.encodeComponent(param[0])}=${Uri.encodeComponent(param[1])}');
paramMap[param[0]] = param[1];
}
oauthList.sort();
String oauthSig =
'oauth_signature="${Uri.encodeComponent(generateSignature("GET", "https://api.twitter.com$base", oauthList))}"';
return await http
.get(new Uri.https("api.twitter.com", base, paramMap), headers: {
"Authorization":
'Oauth $oauthConsumer, $oauthNonce, $oauthSig, $oauthMethod, $oauthTime, $oauthToken, $oauthVersion',
"Content-Type": "application/json"
}).timeout(Duration(seconds: 15));
}
示例调用：
Future<User> getUser(String tag) async {
String base = '/1.1/users/show.json';
final response = await _twitterGet(base, [
["screen_name", tag],
["tweet_mode", "extended"]
]);
if (response.statusCode == 200) {
try {
return User(json.decode(response.body));
} catch (e) {
print(e);
return null;
}
} else {
print("Error retrieving user");
print(response.body);
return null;
}
}
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