一，服务商签名
二，服务商证书获取
三，图片上传
四，敏感信息加密
五，查询进件状态
除此之外，就是进件信息的拼装
电商二级商户进件申请单-状态流转
一 服务商签名
首先准备必须的配置：商户号、证书、秘钥、小程序appid、appsecret
#region 服务商签名
private string srvpaybuildauthasync(string uri, string body, string method = "post")
{
var timestamp = datetimeoffset.now.tounixtimeseconds();
string nonce = guid.newguid().tostring();
string message = $"{method}\n{uri}\n{timestamp}\n{nonce}\n{body}\n";
string signature = srvsign(message);
return $"mchid=\"{_wxcfg.srvpaymerchantid}\",nonce_str=\"{nonce}\",timestamp=\"{timestamp}\",serial_no=\"{_wxcfg.srvpaycertno}\",signature=\"{signature}\"";
}
private string srvsign(string message)
{
var bytes = utils.readbytesifexist(_wxcfg.srvpaycertfile);
if (bytes is null)
{
return "";
}
x509certificate2 cert = new(bytes, _wxcfg.srvpaymerchantid);
rsa rsa = cert.getrsaprivatekey();
var signdata = rsa.signdata(encoding.utf8.getbytes(message), hashalgorithmname.sha256, rsasignaturepadding.pkcs1);
return convert.tobase64string(signdata);
}
二 获取证书
分为：第一步获取证书，第二步解密证书
1 获取证书
https://api.mch.weixin.qq.com/v3/certificates
#region 获取平台证书
public async task<certificatesoutmodel> getsrvcert()
{
string uri = "/v3/certificates";
var auth = srvpaybuildauthasync(uri, "", "get");
var header = new dictionary<string, string>
{
{ "authorization",$"wechatpay2-sha256-rsa2048 {auth}"},
{ "accept","*/*" },
{ "accept-encoding","gzip,deflate,brn" },
{ "user-agent", "mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/90.0.4430.85 safari/537.36 edg/90.0.818.46" },
};
return await geturlasync<certificatesoutmodel>(uri, header);
}
#endregion
使用的实体：certificatesoutmodel
public sealed class certificatesoutmodel : iwxresponse
{
[jsonpropertyname("data")]
public ienumerable<certificates> data { get; set; }
public string code { get; set; }
public string message { get; set; }
}
public class certificates
{
[jsonpropertyname("serial_no")]
public string serialno { get; set; }
[jsonpropertyname("effective_time")]
public string effectivetime { get; set; }
[jsonpropertyname("expire_time")]
public string expiretime { get; set; }
[jsonpropertyname("encrypt_certificate")]
public encryptcertificate encryptcertificate { get; set; }
}
请求方法：geturlasync
protected async task<t> geturlasync<t>(string url, dictionary<string, string> headers = null)
{
httpresponsemessage res = null;
try
{
if (headers != null && headers.count > 0)
{
foreach (var header in headers)
{
_client.defaultrequestheaders.tryaddwithoutvalidation(header.key, header.value);
}
}
res = await _client.getasync(url);
res.ensuresuccessstatuscode();
var result = await res.content.readasstringasync();
if (result == null)
{
return default;
}
return result.tojson<t>();
}
catch
{
var result = await res.content.readasstringasync();
if (result == null)
{
return default;
}
return result.tojson<t>();
}
}
解密方法
//获取证书
var cert = await _wxclient.getsrvcert();
var certificatemodel = cert.data.firstordefault();
if (!cert.data.any())
{
return new mkresult<v3wxpayapplymentidoutmodel>(code: 400, msg: "未获取到平台证书");
}
if (!string.isnullorempty(applyment.body.serialno))
{
certificatemodel = cert.data.singleordefault(s => s.serialno == applyment.body.serialno);
}
certificatemodel.encryptcertificate.ciphertext = aesutility.aesgcmdecrypt(
_wxcfg.srvapiv3key,
certificatemodel.encryptcertificate.associateddata,
certificatemodel.encryptcertificate.nonce,
certificatemodel.encryptcertificate.ciphertext
);
三，上传图片
因为我的图片保存在oss，首先要网络图片bytes，对图片进行sha256，方法在后面
protected async task<byte[]> geturlbytesasync(string url, dictionary<string, string> headers = null)
{
try
{
if (headers != null && headers.count > 0)
{
foreach (var header in headers)
{
_client.defaultrequestheaders.tryaddwithoutvalidation(header.key, header.value);
}
}
var res = await _client.getasync(url);
res.ensuresuccessstatuscode();
return await res.content.readasbytearrayasync();
}
catch
{
return default;
}
}
然后上传图片
/// <summary>
/// 上传图片
/// </summary>
/// <param name="url"></param>
/// <returns></returns>
public async task<mkresult<v3wxpayfileuploadoutmodel>> uploadfile(string url)
{
string filecontenttype;
string filetype;
if (url!.contains(".bmp", stringcomparison.ordinalignorecase))
{
filecontenttype = "image/bmp";
filetype = ".bmp";
}
else if (url!.contains(".jpg", stringcomparison.ordinalignorecase))
{
filecontenttype = "image/jpeg";
filetype = ".jpg";
}
else if (url!.contains(".jpeg", stringcomparison.ordinalignorecase))
{
filecontenttype = "image/jpeg";
filetype = ".jpeg";
}
else
{
filecontenttype = "image/png";
filetype = ".png";
}
uploadmerchantmediaimagerequest meta = new();
var filebytes = await geturlbytesasync(url);//获取网络图片bytes
if ((filebytes?.length ?? 0) == 0)
{
return new mkresult<v3wxpayfileuploadoutmodel>(code: 400, msg: "转换图片失败");
}
meta.filehash = gethash(filebytes);
meta.filename = guid.newguid().tostring("n").tolower() + filetype;
string boundary = "--boundary--" + datetimeoffset.now.ticks.tostring("x");
using var filecontent = new bytearraycontent(filebytes);
using var metacontent = new stringcontent(meta.tojson(), encoding.utf8, "application/json");
using var httpcontent = new multipartformdatacontent(boundary);
httpcontent.add(metacontent, "\"meta\"");//meta 必须要加双引号
httpcontent.add(filecontent, "\"file\"", "\"" + meta.filename + "\"");//必须要加双引号
httpcontent.headers.contenttype = mediatypeheadervalue.parse("multipart/form-data; boundary=" + boundary);// boundary不能加引号
metacontent.headers.contenttype = mediatypeheadervalue.parse("application/json");
filecontent.headers.contenttype = mediatypeheadervalue.parse(filecontenttype);
var uri = $"/v3/merchant/media/upload";
var res = await v3uploadfile<v3wxpayfileuploadoutmodel>(uri, meta.tojson(), httpcontent);
return new mkresult<v3wxpayfileuploadoutmodel>(res, 1);
}
private async task<t> v3uploadfile<t>(string uri, string meta, multipartformdatacontent content)
{
var auth = srvpaybuildauthasync(uri, meta);
var header = new dictionary<string, string>
{
{ "authorization",$"wechatpay2-sha256-rsa2048 {auth}"},
{ "accept","*/*" },
{ "accept-encoding","gzip,deflate,brn" },
{ "user-agent", "mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/90.0.4430.85 safari/537.36 edg/90.0.818.46" },
};
return await v3postfileasync<t>(uri, header, content);
}
protected async task<t> v3postfileasync<t>(string url, dictionary<string, string> headers, multipartformdatacontent content)
{
httpresponsemessage res = null;
try
{
if (headers != null && headers.count > 0)
{
foreach (var header in headers)
{
_client.defaultrequestheaders.tryaddwithoutvalidation(header.key, header.value);
}
}
res = await _client.postasync(url, content);
res.ensuresuccessstatuscode();
var result = await res.content.readasstringasync();
if (result == null)
{
return default;
}
return result.tojson<t>();
}
catch
{
var result = await res.content.readasstringasync();
if (result == null)
{
return default;
}
return result.tojson<t>();
}
finally
{
if (content != null)
{
content.dispose();
}
}
}
#region 二进制内容进行sha256
private static string gethash(byte[] bytes)
{
if (bytes == null) throw new argumentnullexception(nameof(bytes));
using sha256 sha = sha256.create();
byte[] hashbytes = sha.computehash(bytes);
return bitconverter.tostring(hashbytes).replace("-", "").tolower();
}
四，敏感信息加密
使用获取到的证书certificatemodel，进行加密
public static class rsautility
{
public static string rsaencrypt(string text, certificates certificatemodel)
{
var bytes = encoding.utf8.getbytes(certificatemodel.encryptcertificate.ciphertext);
using var x509 = new x509certificate2(bytes);
var rsaparam = x509.getrsapublickey().exportparameters(false);
var rsa = new rsacryptoserviceprovider();
rsa.importparameters(rsaparam);
var buff = rsa.encrypt(encoding.utf8.getbytes(text), true);
return convert.tobase64string(buff);
}
}
五，查询进件状态
直接使用进件返回的id,调用接口查询就ok了
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