微信小程序环境下将文件上传到 OSS

迷南。 2021-09-19 16:46 333阅读 0赞

步骤 1： 配置 Bucket 跨域  
客户端进行表单直传到 OSS 时，会从浏览器向 OSS 发送带有 Origin 的请求消息。OSS 对带有 Origin 头的请求消息会进行跨域规则（CORS）的验证。因此需要为 Bucket 设置跨域规则以支持 Post 方法。

![image.png][]

## 步骤 2：配置外网域名到小程序的上传域名白名单中 ##

1.  通过 OSS 控制台查看外网域名。  
    [![image][]][image 1]
2.  登录微信小程序平台，配置小程序的上传域名白名单。[![image][image 2]][image_image 2]

步骤 3：使用 Web 端直传实践方案 Demo 进行上传测试

下载应用服务器代码

修改 Demo 中 upload.js 的密钥和地址。  
[![image][image 3]][image_image 3]

进行上传测试。

![image.png][image.png 1]

![image.png][image.png 2]

![image.png][image.png 3]

获取上传需要的签名（signature）和加密策略（policy）

使用微信小程序上传图片  
使用 chooseImage API 进行图片选择，然后调用 uploadFile 进行文件上传

[![image][image 4]][image_image 4]

[https://help.aliyun.com/product/31815.html?spm=a2c4g.11186623.6.540.155a7eaeW7iaPX][https_help.aliyun.com_product_31815.html_spm_a2c4g.11186623.6.540.155a7eaeW7iaPX]

## upload.js ##

accessid= '';
    accesskey= '';
    host = '';
    
    g_dirname = ''
    g_object_name = ''
    g_object_name_type = ''
    now = timestamp = Date.parse(new Date()) / 1000; 
    
    var policyText = {
        "expiration": "2020-01-01T12:00:00.000Z", //设置该Policy的失效时间，超过这个失效时间之后，就没有办法通过这个policy上传文件了
        "conditions": [
        ["content-length-range", 0, 1048576000] // 设置上传文件的大小限制
        ]
    };
    
    var policyBase64 = Base64.encode(JSON.stringify(policyText))
    message = policyBase64
    var bytes = Crypto.HMAC(Crypto.SHA1, message, accesskey, { asBytes: true }) ;
    var signature = Crypto.util.bytesToBase64(bytes);
    
    function check_object_radio() {
        var tt = document.getElementsByName('myradio');
        for (var i = 0; i < tt.length ; i++ )
        {
            if(tt[i].checked)
            {
                g_object_name_type = tt[i].value;
                break;
            }
        }
    }
    
    function get_dirname()
    {
        dir = document.getElementById("dirname").value;
        if (dir != '' && dir.indexOf('/') != dir.length - 1)
        {
            dir = dir + '/'
        }
        //alert(dir)
        g_dirname = dir
    }
    
    function random_string(len) {
    　　len = len || 32;
    　　var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';   
    　　var maxPos = chars.length;
    　　var pwd = '';
    　　for (i = 0; i < len; i++) {
        　　pwd += chars.charAt(Math.floor(Math.random() * maxPos));
        }
        return pwd;
    }
    
    function get_suffix(filename) {
        pos = filename.lastIndexOf('.')
        suffix = ''
        if (pos != -1) {
            suffix = filename.substring(pos)
        }
        return suffix;
    }
    
    function calculate_object_name(filename)
    {
        if (g_object_name_type == 'local_name')
        {
            g_object_name += "${filename}"
        }
        else if (g_object_name_type == 'random_name')
        {
            suffix = get_suffix(filename)
            g_object_name = g_dirname + random_string(10) + suffix
        }
        return ''
    }
    
    function get_uploaded_object_name(filename)
    {
        if (g_object_name_type == 'local_name')
        {
            tmp_name = g_object_name
            tmp_name = tmp_name.replace("${filename}", filename);
            return tmp_name
        }
        else if(g_object_name_type == 'random_name')
        {
            return g_object_name
        }
    }
    
    function set_upload_param(up, filename, ret)
    {
        g_object_name = g_dirname;
        if (filename != '') {
            suffix = get_suffix(filename)
            calculate_object_name(filename)
        }
        new_multipart_params = {
            'key' : g_object_name,
            'policy': policyBase64,
            'OSSAccessKeyId': accessid, 
            'success_action_status' : '200', //让服务端返回200,不然，默认会返回204
            'signature': signature,
        };
    
        up.setOption({
            'url': host,
            'multipart_params': new_multipart_params
        });
    
        up.start();
    }
    
    var uploader = new plupload.Uploader({
    	runtimes : 'html5,flash,silverlight,html4',
    	browse_button : 'selectfiles', 
        //multi_selection: false,
    	container: document.getElementById('container'),
    	flash_swf_url : 'lib/plupload-2.1.2/js/Moxie.swf',
    	silverlight_xap_url : 'lib/plupload-2.1.2/js/Moxie.xap',
        url : 'http://oss.aliyuncs.com',
    
    	init: {
    		PostInit: function() {
    			document.getElementById('ossfile').innerHTML = '';
    			document.getElementById('postfiles').onclick = function() {
                set_upload_param(uploader, '', false);
                return false;
    			};
    		},
    
    		FilesAdded: function(up, files) {
    			plupload.each(files, function(file) {
    				document.getElementById('ossfile').innerHTML += '<div id="' + file.id + '">' + file.name + ' (' + plupload.formatSize(file.size) + ')<b></b>'
    				+'<div class="progress"><div class="progress-bar" style="width: 0%"></div></div>'
    				+'</div>';
    			});
    		},
    
    		BeforeUpload: function(up, file) {
                check_object_radio();
                get_dirname();
                set_upload_param(up, file.name, true);
            },
    
    		UploadProgress: function(up, file) {
    			var d = document.getElementById(file.id);
    			d.getElementsByTagName('b')[0].innerHTML = '<span>' + file.percent + "%</span>";
                var prog = d.getElementsByTagName('div')[0];
    			var progBar = prog.getElementsByTagName('div')[0]
    			progBar.style.width= 2*file.percent+'px';
    			progBar.setAttribute('aria-valuenow', file.percent);
    		},
    
    		FileUploaded: function(up, file, info) {
                if (info.status == 200)
                {
                    document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = 'upload to oss success, object name:' + get_uploaded_object_name(file.name);
                }
                else
                {
                    document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = info.response;
                } 
    		},
    
    		Error: function(up, err) {
    			document.getElementById('console').appendChild(document.createTextNode("\nError xml:" + err.response));
    		}
    	}
    });
    
    uploader.init();

## index.html ##

<!DOCTYPE html>
    <html>
    <head>
    	<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    	<title>OSS web直传</title>
    	<link rel="stylesheet" type="text/css" href="style.css"/>
    	<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
    </head>
    <body>
    
    <h2>OSS web直传---直接在JS签名</h2>
    <ol>
    <li>基于plupload封装 </li>
    <li>支持html5,flash,silverlight,html4 等协议上传</li>
    <li>可以运行在PC浏览器，手机浏览器，微信</li>
    <li>可以选择多文件上传</li>
    <li>显示上传进度条</li>
    <li>可以控制上传文件的大小</li>
    <li>最关键的是，让你10分钟之内就能移植到你的系统，实现以上牛逼的功能！</li>
    <li>注意一点，bucket必须设置了Cors(Post打勾）,不然没有办法上传</li>
    <li>注意一点，把upload.js 里面的host/accessid/accesskey改成您上传所需要的信息即可</li>
    <li>此方法是直接在前端签名，有accessid/accesskey泄漏的风险, 线上生产请使用后端签名例子<a href="https://help.aliyun.com/document_detail/oss/practice/pc_web_upload/js_php_upload.html">点击查看详细文档</a></li>
    </ol>
    <br>
    <form name=theform>
    <input type="radio" name="myradio" value="local_name" checked=true/> 上传文件名字保持本地文件名字
    <input type="radio" name="myradio" value="random_name" /> 上传文件名字是随机文件名
    <br/>
    上传到指定目录:<input type="text" id='dirname' placeholder="如果不填，默认是上传到根目录" size=50>
    </form>
    
    <h4>您所选择的文件列表：</h4>
    <div id="ossfile">你的浏览器不支持flash,Silverlight或者HTML5！</div>
    
    <br/>
    
    <div id="container">
    	<a id="selectfiles" href="javascript:void(0);" class='btn'>选择文件</a>
    	<a id="postfiles" href="javascript:void(0);" class='btn'>开始上传</a>
    </div>
    
    <pre id="console"></pre>
    
    <p> </p>
    
    </body>
    <script type="text/javascript" src="lib/crypto1/crypto/crypto.js"></script>
    <script type="text/javascript" src="lib/crypto1/hmac/hmac.js"></script>
    <script type="text/javascript" src="lib/crypto1/sha1/sha1.js"></script>
    <script type="text/javascript" src="lib/base64.js"></script>
    <script type="text/javascript" src="lib/plupload-2.1.2/js/plupload.full.min.js"></script>
    <script type="text/javascript" src="upload.js"></script>
    </html>

## 实现点击按钮选择图片后显示图片并且可以预览该图片 ##

![image.png][image.png 4]

![image.png][image.png 5]

![image.png][image.png 6]

![image.png][image.png 7]

跳转的按钮在子组件

this.$navigate({url:"content"})
    
    this.$parent.$navigate({url:"content"})
    
    wepy.navigateTo({
    url: '/pages/content'
    })

--------------------

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