运行环境

操作系统：win平台

Python版本：3.9.6

请求示例

from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA256
import base64
import http.client
import time

def RSA_sign(data):
    privateKey = open("私钥文件地址").read()
    priKey = RSA.importKey(privateKey)
    signer = PKCS1_v1_5.new(priKey)
    hash_obj = SHA256.new(data.encode('utf-8'))
    signature = base64.b64encode(signer.sign(hash_obj)).decode('utf8')
    return signature

if __name__ == '__main__':
    method = "请求方法，例如GET、POST"
    url = "请求接口地址，例如/v3/certificates"
    non_str = "随机字符串"
    t = str(int(time.time()))
    body = "请求body内容，取决业务接口是否需要传入，不需要的情况下，使用空字符"
    data = method+"\n"+url+"\n"+t+"\n"+non_str+"\n"+body+"\n"
    signature = RSA_sign(data)
    serial_no = "证书序列号，可以登录商户平台自行查看"
    mch_id = "商户号"
    Authorization = 'WECHATPAY2-SHA256-RSA2048 mchid="'+mch_id+'",nonce_str="'+non_str+'",signature="'+signature+'",timestamp="'+t+'",serial_no="'+serial_no+'"'
    
    conn = http.client.HTTPSConnection("api.mch.weixin.qq.com")
    headers = {
        'Authorization': Authorization,
        'Accept': 'application/json',
        'User-Agent': '请求UA',
        'Content-Type': 'application/json'
    }
    conn.request(method, url, body, headers)
    res = conn.getresponse()
    data = res.read()
    print(data.decode("utf-8"))

基于http.client请求图片上传示例

def upload():
    method = "POST"
    url = "/v3/merchant/media/upload"
    filePath = '文件地址'
    file = open(filePath, 'rb').read()
    fileName = os.path.basename(filePath)
    fileType = mimetypes.guess_type(filePath)[0] or 'application/octet-stream'
    fileSha256 = hashlib.sha256()
    fileSha256.update(file)
    metaRaw = {
        'filename': fileName,
        'sha256': fileSha256.hexdigest()
    }
    info = json.dumps(metaRaw)
    dataList = []
    boundary = '自定义边界信息'
    dataList.append(encode('--' + boundary))
    dataList.append(encode('Content-Disposition: form-data; name="meta";'))
    dataList.append(encode('Content-Type: application/json;'))
    dataList.append(encode(''))
    dataList.append(encode(info))
    dataList.append(encode('--' + boundary))
    dataList.append(encode('Content-Disposition: form-data; name="file"; filename="' + fileName + '"'))
    dataList.append(encode('Content-Type: ' + fileType))
    dataList.append(encode(''))
    dataList.append(file)
    dataList.append(encode('--' + boundary + '--'))
    dataList.append(encode(''))
    body = b'\r\n'.join(dataList)
    #后面的就不写了，注意的点就是header头里面'Content-Type': 'application/json'改成'Content-type': 'multipart/form-data; boundary=' + boundary

其他事项

1、图片上传也可以使用request库来实现，而且更加的方便、简洁，只需要注意'Content-Type': 'application/json'修改成'Content-Type': 'multipart/form-data'

2、如果出现请求图片提示"输入源“/body/file”映射到字段“图片文件”必填性规则校验失败，此字段为必填项"这样的信息，建议看下边界设置是否有问题，顺带记得看下file、filename是否有加双引号

3、签名失败的，通常是边界设置问题，或者就是请求头中的content-type设置成错误的格式