/*
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* @Author: lixiong
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* @Date: 2019-09-06 14:13:27
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* @Last Modified by: lixiong
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* @Last Modified time: 2019-10-15 09:44:41
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*/
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// 基础请求封装
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export default class BaseFetch {
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/**
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* constructor 构造函数
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* @param {Object} conf 实例全局配置，配置项基本同 defaultConf
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*/
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constructor(conf = {}) {
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this.defaultConf = {
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timeout: 30000,
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method: 'post',
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headers: {
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'Content-Type': 'application/json;charset=UTF-8'
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}
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}
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this.specialBodyKeys = ['body', 'method', 'headers']
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this.init(conf)
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}
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/**
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* 初始化，合并配置
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* @param {Object} conf 全局配置
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*/
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init(conf) {
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const { defaultConf } = this
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this.conf = Object.assign({}, { ...defaultConf }, { ...conf })
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}
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/**
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* post 请求处理
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* @param {String} api 接口地址
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* @param {Object|String} body 请求参数
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* @param {Object} conf 请求配置信息
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*/
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toPost(api, body = {}, conf = {}) {
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return this.toFetch(api, body, { method: 'post', ...conf })
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}
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/**
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* get 请求处理
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* @param {String} api 接口地址
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* @param {Object|String} body 请求参数
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* @param {Object} conf 请求配置信息
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*/
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toGet(api, body = {}, conf = {}) {
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return this.toFetch(api, body, { method: 'get', ...conf })
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}
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/**
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* mixConf 合并配置项
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* @param {Object} conf 请求配置项
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* @param {Object} body 参数或包含参数的配置项 @example {data: {name: 'someone'}}
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* @param {Object} conf 请求配置信息
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*/
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mixConf(api, body = {}, conf = {}) {
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const { specialBodyKeys } = this
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let mixConf = { ...this.conf, ...conf }
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if (typeof body === 'string') {
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mixConf = { ...mixConf, body }
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}
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if (typeof body === 'object') {
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// body包含配置项，则body为配置信息
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if (Object.keys(body).some(key => specialBodyKeys.includes(key))) {
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mixConf = { ...mixConf, ...body }
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} else {
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mixConf = { ...mixConf, body }
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}
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}
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const { method, body: mixBody, headers, ...other } = mixConf
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const url = this.getUrl(api, mixConf)
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let result =
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headers === false
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? { url, method, ...other }
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: { url, method, headers, ...other }
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if (method.toLocaleLowerCase() !== 'get') {
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result = { ...result, body: this.getBody(mixConf) }
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}
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return result
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}
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/**
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* joinPath拼接路径，去重中间重复连接符/
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* @param {Array} pathArr 路径数组
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* @param {Boolean} isReplaceFirst 是否去除第一个路径前的/
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*/
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joinPath(pathArr, isReplaceFirst = false) {
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return pathArr.reduce((pre, curr, index) => {
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const nextPath = curr.replace(/^\/+/, '')
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curr = index === 0 && !isReplaceFirst ? curr : nextPath
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pre = pre === '' ? curr : `${pre.replace(/\/+$/, '')}/${nextPath}`
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return pre
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}, '')
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}
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/**
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* getUrl 获取请求url完整地址
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* @param {String} api请求地址
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* @param {Object} mixConf 混入后的请求配置
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*/
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getUrl(api, mixConf) {
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const { method, body } = mixConf
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if (method.toLocaleLowerCase() === 'get') {
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const str = this.getUrlbody(api, body)
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api = api.includes('?') ? `${api}&${str}` : `${api}?${str}`
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}
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return api
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}
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/**
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* getUrlbody 拼接url字符串
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* @param {String} api 接口地址
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* @param {Object|String} body 请求参数
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* @param {Object} conf 请求配置信息
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*/
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getUrlbody(api, body) {
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if (typeof body === 'object') {
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body = Object.keys(body).reduce((pre, curr) => {
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const val =
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typeof body[curr] === 'object'
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? JSON.stringify(body[curr])
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: body[curr]
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pre = pre === '' ? pre : `${pre}&`
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pre = `${pre}${curr}=${val}`
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return pre
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}, '')
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}
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return body
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}
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/**
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* getBody 根据headers信息，
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* @param {Object} mixConf 请求配置项
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*/
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getBody(mixConf) {
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let { body, headers } = mixConf
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if (typeof headers === 'object') {
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Object.keys(headers).forEach(key => {
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if (key.toLocaleLowerCase() === 'content-type') {
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// json string
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if (
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headers[key].includes('application/json') &&
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typeof body !== 'string'
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) {
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body = JSON.stringify(body)
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}
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// body
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if (headers[key].includes('application/x-www-form-urlencoded')) {
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body = this.getUrlbody(body)
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}
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// file
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if (
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headers[key].includes('multipart/form-data') &&
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!(body instanceof FormData)
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) {
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const formData = new FormData()
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Object.keys(body).forEach(key => {
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formData.append(key, body[key])
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})
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}
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}
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})
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}
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return body
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}
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/**
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* 请求统一入口
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* @param {String} api 接口地址
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* @param {Object|String} body 请求参数
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* @param {Object} conf 请求配置信息
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*/
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toFetch(api, body = {}, conf = {}) {
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const { url, ...other } = this.mixConf(api, body, conf)
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return new Promise((resolve, reject) => {
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fetch(url, other).then(res => {
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if (res.ok) {
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resolve(res.json())
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}
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reject(new Error(`接口：${url}，请求异常！`))
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})
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})
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}
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}
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