小程序上传图片到腾讯云

// 前端代码示例
wx.chooseImage({
  success: function(res) {
    const tempFilePaths = res.tempFilePaths;
    wx.uploadFile({
      url: 'https://<your-bucket-name>.cos.<region>.myqcloud.com', // 替换为你的COS地址
      filePath: tempFilePaths[0],
      name: 'file',
      formData: {
        'key': 'your-object-key', // 替换为你的对象键
        'Signature': 'your-signature', // 替换为你的签名
        'x-cos-meta-uuid': '123456789' // 自定义元数据
      },
      success: function(res) {
        console.log('上传成功', res);
      },
      fail: function(err) {
        console.error('上传失败', err);
      }
    });
  }
});

# 后端代码示例（Python）
import hmac
import hashlib
import base64
from datetime import datetime

def get_signature(secret_id, secret_key, method, path, expires):
    string_to_sign = f"{method}\n\n\n{expires}\n/{path}"
    hmac_str = hmac.new(secret_key.encode('utf-8'), string_to_sign.encode('utf-8'), hashlib.sha1).digest()
    signature = base64.b64encode(hmac_str).decode('utf-8')
    return signature

# 示例调用
secret_id = 'your-secret-id'
secret_key = 'your-secret-key'
method = 'PUT'
path = 'your-object-key'
expires = int((datetime.utcnow() + timedelta(seconds=30)).timestamp())
signature = get_signature(secret_id, secret_key, method, path, expires)
print(signature)