.Net|.Net Core微信服务商二次进件的开发 .NetCore微信服务商二次进件的开

最近商城进行微信服务商二次进件的开发，大致有几个点
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

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电商二级商户进件申请单-状态流转

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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 = https://www.it610.com/article/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 GetSrvCert(){string uri = "/v3/certificates"; var auth = SrvPayBuildAuthAsync(uri, "", "GET"); var header = new Dictionary{{ "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(uri, header); }#endregion

使用的实体：CertificatesOutModel

public sealed class CertificatesOutModel : IWXResponse{[JsonPropertyName("data")]public IEnumerable 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 GetUrlAsync(string url, Dictionary 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(); }catch{var result = await res.Content.ReadAsStringAsync(); if (result == null){return default; }return result.ToJson(); }}

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(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 GetUrlBytesAsync(string url, Dictionary 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

/// /// 上传图片/// /// /// public async Task> 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Bytesif ((fileBytes?.Length ?? 0) == 0){return new MKResult(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(uri, meta.ToJson(), httpContent); return new MKResult(res, 1); }

private async Task V3UpLoadFile(string uri, string meta, MultipartFormDataContent content){var auth = SrvPayBuildAuthAsync(uri, meta); var header = new Dictionary{{ "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(uri, header, content); }

protected async Task V3PostFileAsync(string url, Dictionary 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(); }catch{var result = await res.Content.ReadAsStringAsync(); if (result == null){return default; }return result.ToJson(); }finally{if (content != null){content.Dispose(); }}}

#region 二进制内容进行sha256private 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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