gf/g/util/gvalid/gvalid_check_struct.go

// Copyright 2017-2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

package gvalid

import (
	"strings"

	"github.com/gogf/gf/g/text/gstr"
	"github.com/gogf/gf/g/util/gconv"
	"github.com/gogf/gf/third/github.com/fatih/structs"
)

// 校验struct对象属性，object参数也可以是一个指向对象的指针，返回值同CheckMap方法。
// struct的数据校验结果信息是顺序的。
func CheckStruct(object interface{}, rules interface{}, msgs ...CustomMsg) *Error {
	fields := structs.Fields(object)
	params := make(map[string]interface{})
	checkRules := make(map[string]string)
	customMsgs := make(CustomMsg)
	// 返回的顺序规则
	errorRules := make([]string, 0)
	// 返回的校验错误
	errorMaps := make(ErrorMap)
	// 解析rules参数
	switch v := rules.(type) {
	// 支持校验错误顺序: []sequence tag
	case []string:
		for _, tag := range v {
			name, rule, msg := parseSequenceTag(tag)
			if len(name) == 0 {
				continue
			}
			// 错误提示
			if len(msg) > 0 {
				ruleArray := strings.Split(rule, "|")
				msgArray := strings.Split(msg, "|")
				for k, v := range ruleArray {
					// 如果msg条数比rule少，那么多余的rule使用默认的错误信息
					if len(msgArray) <= k {
						continue
					}
					if len(msgArray[k]) == 0 {
						continue
					}
					array := strings.Split(v, ":")
					if _, ok := customMsgs[name]; !ok {
						customMsgs[name] = make(map[string]string)
					}
					customMsgs[name].(map[string]string)[strings.TrimSpace(array[0])] = strings.TrimSpace(msgArray[k])
				}
			}
			checkRules[name] = rule
			errorRules = append(errorRules, name+"@"+rule)
		}

		// 不支持校验错误顺序: map[键名]校验规则
	case map[string]string:
		checkRules = v
	}
	// 首先, 按照属性循环一遍将struct的属性、数值、tag解析
	for _, field := range fields {
		fieldName := field.Name()
		// 只检测公开属性
		if !gstr.IsLetterUpper(fieldName[0]) {
			continue
		}
		params[fieldName] = field.Value()
		// 同时支持valid和gvalid标签，优先使用valid
		tag := field.Tag("valid")
		if tag == "" {
			tag = field.Tag("gvalid")
		}
		if tag != "" {
			// sequence tag == struct tag, 这里的name为别名
			name, rule, msg := parseSequenceTag(tag)
			if len(name) == 0 {
				name = fieldName
			}
			// params参数使用别名**扩容**(而不仅仅使用别名)，仅用于验证使用
			if _, ok := params[name]; !ok {
				params[name] = field.Value()
			}
			// 校验规则
			if _, ok := checkRules[name]; !ok {
				checkRules[name] = rule
				errorRules = append(errorRules, name+"@"+rule)
			} else {
				// 传递的rules规则会覆盖struct tag的规则
				continue
			}
			// 错误提示
			if len(msg) > 0 {
				ruleArray := strings.Split(rule, "|")
				msgArray := strings.Split(msg, "|")
				for k, v := range ruleArray {
					// 如果msg条数比rule少，那么多余的rule使用默认的错误信息
					if len(msgArray) <= k {
						continue
					}
					if len(msgArray[k]) == 0 {
						continue
					}
					array := strings.Split(v, ":")
					if _, ok := customMsgs[name]; !ok {
						customMsgs[name] = make(map[string]string)
					}
					customMsgs[name].(map[string]string)[strings.TrimSpace(array[0])] = strings.TrimSpace(msgArray[k])
				}
			}
		}
	}
	// 自定义错误消息，非必须参数，优先级比rules参数中以及struct tag中定义的错误消息更高
	if len(msgs) > 0 && len(msgs[0]) > 0 {
		if len(customMsgs) > 0 {
			for k, v := range msgs[0] {
				customMsgs[k] = v
			}
		} else {
			customMsgs = msgs[0]
		}
	}

	/* 以下逻辑和CheckMap相同 */

	// 开始执行校验: 以校验规则作为基础进行遍历校验
	var value interface{}
	// 这里的rule变量为多条校验规则，不包含名字或者错误信息定义
	for key, rule := range checkRules {
		value = nil
		if v, ok := params[key]; ok {
			value = v
		}
		if e := Check(value, rule, customMsgs[key], params); e != nil {
			_, item := e.FirstItem()
			// 如果值为nil|""，并且不需要require*验证时，其他验证失效
			if value == nil || gconv.String(value) == "" {
				required := false
				// rule => error
				for k := range item {
					if _, ok := mustCheckRulesEvenValueEmpty[k]; ok {
						required = true
						break
					}
				}
				if !required {
					continue
				}
			}
			if _, ok := errorMaps[key]; !ok {
				errorMaps[key] = make(map[string]string)
			}
			for k, v := range item {
				errorMaps[key][k] = v
			}
		}
	}
	if len(errorMaps) > 0 {
		return newError(errorRules, errorMaps)
	}
	return nil
}