init

middlewares/ValidateDto.js

@@ -0,0 +1,47 @@
+const { validate } = require('class-validator')
+const { plainToClass } = require('class-transformer')
+
+const data_from_array = ['body','query','params','cookie']
+
+/**
+ * 
+ * @param {new ()=>void} dto 
+ * @param {'body'|'query'|'params'|'headers'|'cookie'} from 
+ * @returns {RequestHandler}
+ */
+module.exports = function (dtoFunc,from) {
+  if(!data_from_array.includes(from)) {
+    throw new Error('校验数据源无效')
+  }
+  
+  return async function (req,res,next) {
+
+
+    const dto = plainToClass(dtoFunc,req[from],{ enableImplicitConversion:true,excludeExtraneousValues:true })
+
+    req[from] = dto
+    
+    try{
+      var errors = await validate(dto)
+    }catch(err) {
+      console.error('数据校验过程中报错')
+      res.status(500)
+      res.error('内部错误',500)
+      return
+    }
+
+    if(errors.length === 0) {
+      console.log('数据校验通过')
+      return next()
+    }
+    
+    console.error('数据校验不通过',errors)
+
+    const error = errors[0]
+
+    const errorMsg = Object.entries(error.constraints)[0][1]
+
+    res.error(errorMsg,400,{ is_validate:true,field:error.property,from })
+
+  }
+}