使用 nodeJs 开发微信公众号（上传图片）

var express = require(‘express‘)
var path = require(‘path‘)
var router = express.Router()
var multer = require(‘multer‘)
//uuid工具可以生成唯一标示 需要安装
var UUID = require(‘uuid‘)
var request = require(‘request‘)
var fs = require(‘fs‘)

const MediaModel = require(‘../model/media‘)

//临时路径
var baseApi = `https://api.weixin.qq.com/cgi-bin/media/upload`
//永久路径
// var baseApi = `https://api.weixin.qq.com/cgi-bin/material/add_material`

//设置保存规则
var storage = multer.diskStorage({
    //destination：字段设置上传路径，可以为函数
    destination: path.resolve(__dirname, ‘../upload‘),

    //filename：设置文件保存的文件名
    filename: function(req, file, cb) {
        let extName = file.originalname.slice(file.originalname.lastIndexOf(‘.‘))
        let fileName = UUID.v1()
        cb(null, fileName + extName)
    }
})

//设置过滤规则（可选）
var imageFilter = function(req, file, cb){
    var acceptableMime = [‘image/jpeg‘, ‘image/png‘, ‘image/jpg‘, ‘image/gif‘]
    //微信公众号只接收上述四种类型的图片
    if(acceptableMime.indexOf(file.mimetype) !== -1){
        cb(null, true)
    }else{
        cb(null, false)
    }
}

//设置限制（可选）
var imageLimit = {
    fieldSize: ‘2MB‘
}

//创建 multer 实例
var imageUploader = multer({ 
    storage: storage,
    fileFilter: imageFilter,
    limits: imageLimit
}).array(‘photos‘, 12)    //定义表单字段、数量限制

var videoFilter = function(req, file, cb){
    var acceptableMime = [‘video/mp4‘]
    //微信公众号只接收上述四种类型的图片
    if(acceptableMime.indexOf(file.mimetype) !== -1){
        cb(null, true)
    }else{
        cb(null, false)
    }
}

var videoUploader = multer({ 
    storage: storage,
    fileFilter: videoFilter,
    limits: {
        fieldSize: ‘10MB‘
    }
}).array(‘video‘, 10)

router.post(‘/image‘, imageUploader, function(req, res, next) {
    var api = `${baseApi}?access_token=${global.accessToken}&type=image`
    req.files.forEach(file => {
        var formData = {
            media: fs.createReadStream(file.path)
        }
        request.post({url: api, formData: formData}, function(err,response,body){
            if(err) {
                console.log(‘上传图片失败‘ , err);
                return
            }
            let data = {
                media_id: JSON.parse(response.body).media_id,
                local_url: path.join(path.resolve(__dirname, ‘../upload‘), file.filename),
                type: ‘image‘
            }
　　　　　　　//保存数据库
            MediaModel.create(data).then(res => {
                console.log(`保存图片${res.dataValues.media_id}成功`);
            })
        })
    })
})

router.post(‘/video‘, videoUploader, function(req, res, next) {
    console.log(req.files);
})


module.exports = router