refactor: migrate to Tencent Cloud backend

server/src/lib/cos.js

@@ -0,0 +1,38 @@
+const COS = require('cos-nodejs-sdk-v5')
+const config = require('../config')
+
+let client
+
+function getClient() {
+  if (!client) {
+    client = new COS({
+      SecretId: config.cos.secretId,
+      SecretKey: config.cos.secretKey
+    })
+  }
+  return client
+}
+
+function getObjectUrl(key, expiresSeconds) {
+  return getClient().getObjectUrl({
+    Bucket: config.cos.bucket,
+    Region: config.cos.region,
+    Key: key,
+    Sign: true,
+    Expires: expiresSeconds || 600
+  })
+}
+
+function getPutObjectUrl(key, contentType, expiresSeconds) {
+  return getClient().getObjectUrl({
+    Bucket: config.cos.bucket,
+    Region: config.cos.region,
+    Key: key,
+    Method: 'PUT',
+    Sign: true,
+    Expires: expiresSeconds || 600,
+    Headers: contentType ? { 'Content-Type': contentType } : undefined
+  })
+}
+
+module.exports = { getClient, getObjectUrl, getPutObjectUrl }