/*
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* 分会活动文件下载
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*/
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import Vue from 'vue';
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const _that = new Vue();
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export class ActivityFile {
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static async downloadFile(file_id, file_path, file_type, points) {
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try {
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if (points) {
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// 检查用户积分
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const hasEnoughPoints = await this.checkUserPoints(points);
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if (!hasEnoughPoints) {
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await this.showPointsNotEnough()
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return false;
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}
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// 显示积分确认弹窗
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const confirm = await this.showPointsConfirm(points)
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if (!confirm) {
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return false;
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}
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}
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// 执行下载
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await this.executeDownload(file_id, file_path, file_type, points)
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return true;
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} catch (error) {
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console.error('下载失败:', error)
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uni.showToast({
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title: '下载失败',
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icon: 'none'
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})
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return false;
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}
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}
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static async getFilePath(file_id) {
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return new Promise((resolve) => {
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_that._get(
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'branch.activity/getFilePath', {
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file_id: file_id,
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is_original: 1 // 获取原图
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},
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function(res) {
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resolve(res.data.file_path);
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}
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);
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})
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}
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// 检查用户积分
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static async checkUserPoints(points) {
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return new Promise((resolve) => {
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_that._get(
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'branch.activity/checkUserPoints', {
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points: points
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},
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function(res) {
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resolve(res.data.is_enough);
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}
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);
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})
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}
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static async showPointsConfirm(points) {
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return new Promise((resolve) => {
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uni.showModal({
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title: '下载确认',
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content: `需要花费${points}个${_that.points_name()}，确认下载吗？`,
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success: (res) => {
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resolve(res.confirm)
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}
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})
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})
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}
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static async showPointsNotEnough() {
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return new Promise((resolve) => {
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uni.showModal({
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title: `${_that.points_name()}不足`,
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content: `您的${_that.points_name()}不足，无法下载`,
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showCancel: false,
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success: resolve
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})
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})
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}
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static async executeDownload(file_id, file_path, file_type = 'image', points) {
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await uni.showLoading({
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title: '下载中，请稍后...'
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})
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// 如果文件路径为空，需要从服务器获取
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if (!file_path) {
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file_path = await this.getFilePath(file_id);
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}
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// 生成文件名
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const file_name = new Date().toISOString().replace(/[-:T.Z]/g, '').slice(0, 14) +
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Math.random().toString().slice(2, 6);
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// #ifdef H5
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// 在H5环境中使用Blob方式下载
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return await this.downloadViaBlob(file_path, file_name, points);
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// #endif
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// #ifdef APP-PLUS || MP-WEIXIN
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// 在App和微信环境中使用uni.downloadFile
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return await this.downloadInApp(file_path, points);
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// #endif
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}
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/**
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* H5环境下的安全下载
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*/
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static async downloadViaBlob(file_path, file_name, points) {
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try {
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const response = await fetch(file_path);
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const blob = await response.blob();
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const objectUrl = URL.createObjectURL(blob);
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const a = document.createElement('a');
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a.href = objectUrl;
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a.download = file_name;
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document.body.appendChild(a);
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a.click();
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document.body.removeChild(a);
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setTimeout(() => URL.revokeObjectURL(objectUrl), 1000);
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await uni.hideLoading();
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// 扣除积分
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await this.deductPoints(points);
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uni.showToast({
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title: '下载成功',
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icon: 'success'
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})
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} catch (error) {
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await uni.hideLoading();
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throw new Error(`下载失败: ${error.message}`);
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}
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}
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static async downloadInApp(file_path, points) {
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try {
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// 下载文件到临时路径
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const downloadResult = await uni.downloadFile({
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url: file_path
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})
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if (downloadResult.statusCode !== 200) {
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throw new Error('下载文件失败')
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}
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const { tempFilePath } = downloadResult;
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// 检查相册权限
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const hasPermission = await this.checkPhotoAlbumPermission()
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if (!hasPermission) {
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throw new Error('无相册权限')
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}
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if (file_type = 'image') {
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// 保存到相册
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await uni.saveImageToPhotosAlbum({
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filePath: tempFilePath
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})
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} else {
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// 保存到相册
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await uni.saveVideoToPhotosAlbum({
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filePath: tempFilePath
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})
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}
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await uni.hideLoading();
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// 扣除积分
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await this.deductPoints(points);
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uni.showToast({
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title: '下载成功',
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icon: 'success'
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})
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} catch (error) {
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await uni.hideLoading();
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throw error
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}
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}
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static async checkPhotoAlbumPermission() {
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return new Promise((resolve) => {
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// #ifdef MP-WEIXIN
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uni.getSetting({
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success: (res) => {
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if (res.authSetting['scope.writePhotosAlbum']) {
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resolve(true)
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} else if (res.authSetting['scope.writePhotosAlbum'] === undefined) {
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// 首次尝试授权
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uni.authorize({
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scope: 'scope.writePhotosAlbum',
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success: () => resolve(true),
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fail: () => {
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this.showAuthGuide()
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resolve(false)
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}
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})
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} else {
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this.showAuthGuide()
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resolve(false)
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}
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}
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})
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// #endif
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// #ifdef APP-PLUS || H5
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resolve(true)
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// #endif
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})
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}
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static showAuthGuide() {
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uni.showModal({
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title: '权限申请',
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content: '需要您授权相册权限才能保存图片或视频',
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success: (res) => {
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if (res.confirm) {
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uni.openSetting()
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}
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}
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})
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}
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// 扣除积分
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static async deductPoints(points) {
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return new Promise((resolve) => {
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_that._get(
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'branch.activity/deductPoints', {
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points: points
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},
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function(res) {
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resolve();
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}
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);
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})
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}
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}
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