private string GetKey(string areaId, string type, string date, string appId, string privateKey)
{
var hmac = HMACSHA1.Create();
var publicKey = GetPublicKey(areaId, type, date, appId);
var data = System.Text.Encoding.UTF8.GetBytes(publicKey);
//密钥
var key = System.Text.Encoding.UTF8.GetBytes(privateKey);
hmac.Key = key;
//对数据进行签名
var signedData = hmac.ComputeHash(data);
return Convert.ToBase64String(signedData);
}
private string GetPublicKey(string areaId, string type, string date, string appId)
{
return string.Format("http://open.weather.com.cn/data/?area, areaId, type, date, appId);
}
/// <summary>
/// 获取请求URL
/// </summary>
/// <param name="areaId">地区ID,例:北京=101010100</param>
/// <param name="type">预警:alarm 实况:observe 指数:index 常规预报(24小时):forecast1d</param>
/// <param name="date">日期,年月日时分,例:201410091040</param>
/// <param name="appId"></param>
/// <param name="privateKey"></param>
/// <returns></returns>
public string GetUrl(string areaId, string type, string date, string appId, string privateKey)
{
string key = GetKey(areaId, type, date, appId, privateKey);
return string.Format("http://open.weather.com.cn/data/?area,
areaId, type, date, appId.Substring(0, 6), HttpUtility.UrlEncodeUnicode(key));
}