我实施了OAuth身份验证，并希望使用以下代码搜索推文：
private void searchTweetsWithQuery(string query)
{
var oauth_token = xxx;
var oauth_token_secret = xxx;
var oauth_consumer_key = this.context.ConsumerKey;
var oauth_consumer_secret = this.context.ConsumerSecret;
// oauth implementation details
var oauth_version = "1.0";
var oauth_signature_method = "HMAC-SHA1";
// unique request details
var oauth_nonce = Convert.ToBase64String(
new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
var timeSpan = DateTime.UtcNow
- new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();
// message api details
var status = "Updating status via REST API if this works";
//var resource_url = "https://api.twitter.com/1.1/statuses/user_timeline.json";
var resource_url = "https://api.twitter.com/1.1/search/tweets.json";
var screen_name = "nikogamulin";
// create oauth signature
var baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
"&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}";
var baseString = string.Format(baseFormat,
oauth_consumer_key,
oauth_nonce,
oauth_signature_method,
oauth_timestamp,
oauth_token,
oauth_version
);
baseString = string.Concat("GET&", Uri.EscapeDataString(resource_url), "&", Uri.EscapeDataString(baseString));
var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret),
"&", Uri.EscapeDataString(oauth_token_secret));
string oauth_signature;
using (HMACSHA1 hasher = new HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey)))
{
oauth_signature = Convert.ToBase64String(
hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)));
}
// create the request header
var headerFormat = "OAuth oauth_consumer_key=\"{3}\", oauth_nonce=\"{0}\", oauth_signature=\"{5}\", oauth_signature_method=\"{1}\", " +
"oauth_timestamp=\"{2}\", " +
"oauth_token=\"{4}\", " +
"oauth_version=\"{6}\"";
var authHeader = string.Format(headerFormat,
Uri.EscapeDataString(oauth_nonce),
Uri.EscapeDataString(oauth_signature_method),
Uri.EscapeDataString(oauth_timestamp),
Uri.EscapeDataString(oauth_consumer_key),
Uri.EscapeDataString(oauth_token),
Uri.EscapeDataString(oauth_signature),
Uri.EscapeDataString(oauth_version)
);
// make the request
ServicePointManager.Expect100Continue = false;
var postBody = "screen_name=" + Uri.EscapeDataString(screen_name);//
resource_url += "?q=" + query;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resource_url);
request.Headers.Add("Authorization", authHeader);
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";
WebResponse response = request.GetResponse();
string responseData = new StreamReader(response.GetResponseStream()).ReadToEnd();
}
尝试运行代码时，我在request.GetResponse（）：
时遇到异常The remote server returned an error: (401) Unauthorized.
我尝试使用相同的代码来获取用户状态（“https://api.twitter.com/1.1/statuses/user_timeline.json”）并且它运行正常。有谁知道导致异常的原因是什么？
我尝试运行以下curl命令，它也运行良好：
curl --get 'https://api.twitter.com/1.1/search/tweets.json' --data 'q=ENGAGE' --header 'Authorization: OAuth oauth_consumer_key="xxx", oauth_nonce="xxx", oauth_signature="xxx", oauth_signature_method="HMAC-SHA1", oauth_timestamp="xxx", oauth_token="xxx", oauth_version="1.0"' --verbose
我尝试制作等效的WebRequest对象但尚未设法成功运行它。如果可能的话，我还要感谢是否有人可以展示如何使WebRequest对象发出与上面的curl命令相同的请求。
谢谢！
答案 0 :(得分：0)
解决了这个问题。事实证明，基本字符串中的参数序列很重要。它与其他Twitter API GET请求相同。
这是正确的基本字符串的示例：
var baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
"&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&q={6}";
var baseString = string.Format(baseFormat,
oauth_consumer_key,
oauth_nonce,
oauth_signature_method,
oauth_timestamp,
oauth_token,
oauth_version,
query
);
而以下返回401 Unauthorized：
var baseFormat = "q={6}&oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
"&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}";
var baseString = string.Format(baseFormat,
oauth_consumer_key,
oauth_nonce,
oauth_signature_method,
oauth_timestamp,
oauth_token,
oauth_version,
query
);
以下是返回搜索结果的完整工作方法：
private void searchTweetsWithQuery(string query)
{
var oauth_token = xxx;
var oauth_token_secret = xxx;
var oauth_consumer_key = xxx;
var oauth_consumer_secret = xxx;
// oauth implementation details
var oauth_version = "1.0";
var oauth_signature_method = "HMAC-SHA1";
// unique request details
var oauth_nonce = Convert.ToBase64String(
new ASCIIEncoding().GetBytes(DateTime.Now.Ticks.ToString()));
var timeSpan = DateTime.UtcNow
- new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
var oauth_timestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString();
// message api details
var status = "Updating status via REST API if this works";
//working example: https://dev.twitter.com/discussions/12758
var resource_url = "https://api.twitter.com/1.1/search/tweets.json";
var screen_name = "ENGAGEinterreg";
// create oauth signature
var baseFormat = "oauth_consumer_key={0}&oauth_nonce={1}&oauth_signature_method={2}" +
"&oauth_timestamp={3}&oauth_token={4}&oauth_version={5}&q={6}";
var baseString = string.Format(baseFormat,
oauth_consumer_key,
oauth_nonce,
oauth_signature_method,
oauth_timestamp,
oauth_token,
oauth_version,
query
);
baseString = string.Concat("GET&", Uri.EscapeDataString(resource_url), "&", Uri.EscapeDataString(baseString));
var compositeKey = string.Concat(Uri.EscapeDataString(oauth_consumer_secret),
"&", Uri.EscapeDataString(oauth_token_secret));
string oauth_signature;
using (HMACSHA1 hasher = new HMACSHA1(ASCIIEncoding.ASCII.GetBytes(compositeKey)))
{
oauth_signature = Convert.ToBase64String(
hasher.ComputeHash(ASCIIEncoding.ASCII.GetBytes(baseString)));
}
// create the request header
var headerFormat = "OAuth oauth_consumer_key=\"{3}\", oauth_nonce=\"{0}\", oauth_signature=\"{5}\", oauth_signature_method=\"{1}\", " +
"oauth_timestamp=\"{2}\", " +
"oauth_token=\"{4}\", " +
"oauth_version=\"{6}\"";
var authHeader = string.Format(headerFormat,
Uri.EscapeDataString(oauth_nonce),
Uri.EscapeDataString(oauth_signature_method),
Uri.EscapeDataString(oauth_timestamp),
Uri.EscapeDataString(oauth_consumer_key),
Uri.EscapeDataString(oauth_token),
Uri.EscapeDataString(oauth_signature),
Uri.EscapeDataString(oauth_version)
);
// make the request
ServicePointManager.Expect100Continue = false;
var postBody = "screen_name=" + Uri.EscapeDataString(screen_name);//
resource_url += "?q=" + query;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(resource_url);
request.Headers.Add("Authorization", authHeader);
request.Method = "GET";
request.ContentType = "application/x-www-form-urlencoded";
WebResponse response = request.GetResponse();
string responseData = new StreamReader(response.GetResponseStream()).ReadToEnd();
}