first commit

util/file.js

@@ -0,0 +1,38 @@
+const fs = require('fs')
+
+const getFileBuffer = (path) => fs.readFileSync(path)
+
+const getFilePath = (prefixStr = '', postfixStr = '') => {
+  // 文件名称
+  const uuid = () => {
+    function s4 () {
+      return Math.floor((1 + Math.random()) * 0x10000)
+        .toString(16)
+        .substring(1)
+    }
+    return s4() + s4() + s4() + s4() + s4() + s4() + s4() + s4()
+  }
+  // 文件扩展名 toLowerCase 转小写
+  let prefix = prefixStr
+  if (prefixStr && prefix.substr(prefix.length - 1, 1) !== '/') { prefix += '/' }
+  // 后缀
+  let postfix = ''
+  if (postfixStr) { postfix = '_' + postfixStr }
+  return prefix + uuid() + postfix + '.jpg'
+}
+
+const uuid = () => {
+  function s4 () {
+    return Math.floor((1 + Math.random()) * 0x10000)
+      .toString(16)
+      .substring(1)
+  }
+  return s4() + s4() + s4()
+}
+
+
+module.exports = {
+  getFileBuffer,
+  getFilePath,
+  uuid
+}