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最近项目移动端需要实现微信自定义分享功能，包含分享自定义标题、描述等。
jsapi_ticket
生成签名之前必须先了解一下jsapi_ticket，jsapi_ticket是公众号用于调用微信js接口的临时票据。正常情况下，jsapi_ticket的有效期为7200秒，通过access_token来获取。由于获取jsapi_ticket的api调用次数非常有限，频繁刷新jsapi_ticket会导致api调用受限，影响自身业务，开发者必须在自己的服务全局缓存jsapi_ticket 。
生成签名步骤，获取accesstoken-》获取jsapiticket-》生成签名
appsettings配置文件添加配置
我要评论 "api": {
"jsjdkbaseapi": "https://api.weixin.qq.com/cgi-bin"
},
"jsjdk": {
"appid": "***",
"secret": "****"
}
public class jssdksignhelper
{
private static accesstokenresponse singleaccesstoken;
private string _tencentapi { get; set; }
private string _appid { get; set; }
private string _appsecret { get; set; }
public jssdksignhelper(iconfiguration config)
{
_tencentapi = config["api:jsjdkbaseapi"];
_appid = config["jsjdk:appid"];
_appsecret = config["jsjdk:secret"];
}
public string getaccesstokensingle(out bool isnewobj)
{
isnewobj = false;
if (singleaccesstoken != null && (singleaccesstoken.expire_out > datetime.now.addhours(2)))
{
return singleaccesstoken.access_token;
}
else
{
var response = getaccesstoken();
if (response.errcode == 0)
{
response.expire_out = datetime.now.addhours(expirehour);
singleaccesstoken = response;
isnewobj = true;
return response?.access_token;
}
}
return null;
}
/// <summary>
/// 获取access_token
/// </summary>
/// <returns></returns>
private accesstokenresponse getaccesstoken()
{
string url = _tencentapi + "/token?grant_type=client_credential&appid=" + _appid + "&secret=" + _appsecret;
var response = apiclient.getjson<accesstokenresponse>(url);
return response;
}
/// <summary>
/// 获取jsapiticket
/// </summary>
/// <param name="accesstoken"></param>
/// <returns></returns>
public string getjsapiticket(string accesstoken)
{
if (string.isnullorwhitespace(accesstoken))
{
return null;
}
string url = _tencentapi + $"/ticket/getticket?type=jsapi&access_token={accesstoken}";
var response = apiclient.getjson<accessticketresponse>(url);
return response?.ticket;
}
/// <summary>
/// 获取签名
/// </summary>
/// <param name="jsapi_ticket"></param>
/// <param name="noncestr">随机字符串(必须与wx.config中的noncestr相同)</param>
/// <param name="timestamp">时间戳(必须与wx.config中的timestamp相同)</param>
/// <param name="url">当前网页的url，不包含#及其后面部分(必须是调用js接口页面的完整url)</param>
/// <returns></returns>
public string getsignature(string jsapi_ticket, string noncestr, string timestamp, string url)
{
if (string.isnullorempty(jsapi_ticket) || string.isnullorempty(noncestr) || string.isnullorempty(timestamp) || string.isnullorempty(url))
return null;
var string1builder = new stringbuilder();
string1builder.append("jsapi_ticket=").append(jsapi_ticket).append("&")
.append("noncestr=").append(noncestr).append("&")
.append("timestamp=").append(timestamp).append("&")
.append("url=").append(url.indexof("#") >= 0 ? url.substring(0, url.indexof("#")) : url);
return sha1sign(string1builder.tostring());
}
/// <summary>
/// sha1加密签名
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public string sha1sign(string str)
{
sha1 sha1 = new sha1cryptoserviceprovider();
byte[] bytes_sha1_in = system.text.utf8encoding.default.getbytes(str);
byte[] bytes_sha1_out = sha1.computehash(bytes_sha1_in);
string signature = bitconverter.tostring(bytes_sha1_out);
signature = signature.replace("-", "").tolower();
return signature;
}
}
public class accesstokenresponse: baseresponse
{
/// <summary>
/// 返回access_token值，有效期7200秒
/// </summary>
public string access_token { get; set; }
/// <summary>
/// 过期时间，单位小时
/// </summary>
public datetime expire_out { get; set; }
}
public class accessticketresponse : baseresponse
{
/// <summary>
/// 返回ticket票据，有效期7200秒
/// </summary>
public string ticket { get; set; }
}
public class baseresponse
{
/// <summary>
/// 过期时间，单位秒
/// </summary>
public string expire_in { get; set; }
/// <summary>
/// 错误代码
/// </summary>
public int32 errcode { get; set; }
/// <summary>
/// 错误信息描述
/// </summary>
public string errmsg { get; set; }
}
/// <summary>
/// 获取微信js-jdk时间戳
/// </summary>
/// <returns></returns>
public static string gettimestamp()
{
timespan ts = datetime.utcnow - new datetime(1970, 1, 1, 0, 0, 0);
return convert.toint64(ts.totalseconds).tostring();
}
/// <summary>
/// js-jdk 创建随机字符串
/// </summary>
/// <returns></returns>
public static string creatennonce_str()
{
random r = new random();
var sb = new stringbuilder();
var length = strs.length;
for (int i = 0; i < 15; i++)
{
sb.append(strs[r.next(length - 1)]);
}
return sb.tostring();
}
[httppost]
[route("getsignature")]
public string getsignature(string url= "http://www.sina.cn/")
{
try
{
if (string.isnullorempty(url)) return "url不能为空";
string _jsticket = null, _signature = null;
string _accesstoken = _jssignhelper.getaccesstokensingle(out bool isnewobj);
wxconfigmodel model = new wxconfigmodel();
model.appid = appid;
model.timestamp = myutil.gettimestamp();
model.noncestr = myutil.creatennonce_str();
if (isnewobj|| _wxconfigmodel.signature==null)
{
_jsticket = _jssignhelper.getjsapiticket(_accesstoken);
_signature = _jssignhelper.getsignature(_jsticket, model.noncestr, model.timestamp, url);
model.jsticket = _jsticket;
model.signature = _signature;
_wxconfigmodel = model;
}
return jsonconvert.serializeobject(model);
}
catch (exception ex)
{
throw ex;
}
}
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