windows azure：使用NodeJS设置blob CORS属性

Question

REST API已于2月发布，用于设置blob CORS property，但尚未针对NodeJS实施。

由于我需要此功能，我尝试在运行NodeJS的azure网站的模块中实现它。

基于REST API文档to change CORS properties和generate authentification key，在this使用NodeJS实现身份验证密钥生成时，我尝试按照this帖子中接受的答案，但它对我不起作用。

以下是我在setcrosproperties.js中的内容：

var crypto = require('crypto');
var request = require('request');


exports.setCors = function (MY_ACCOUNT_URL, MY_ACCOUNT_NAME, MY_ACCOUNT_HOST, accountKey) {
    var MY_CORS_XML =
    '<?xml version="1.0" encoding="utf-8"?>'+
        '<StorageServiceProperties>'+
            '<Cors>'+
                '<CorsRule>'+
                    '<AllowedOrigins>*</AllowedOrigins>'+
                    '<AllowedMethods>GET,PUT</AllowedMethods>'+
                    '<MaxAgeInSeconds>500</MaxAgeInSeconds>'+
                    '<ExposedHeaders>x-ms-meta-data*,x-ms-meta-customheader</ExposedHeaders>'+
                    '<AllowedHeaders>x-ms-meta-target*,x-ms-meta-customheader</AllowedHeaders>'+
                '</CorsRule>'+
            '</Cors>'+
            '<DefaultServiceVersion>2013-08-15</DefaultServiceVersion>'+
        '</StorageServiceProperties>';


    var url = MY_ACCOUNT_URL + '/?restype=service&comp=properties';
    var canonicalizedResource = '/' + MY_ACCOUNT_NAME + '/?comp=properties';
    var corsMD5 = crypto.createHash('md5' ).update(MY_CORS_XML).digest('base64');
    var date = (new Date()).toUTCString();
    var headers = {
        'x-ms-version': '2013-08-15',
        'x-ms-date': date,
        'Host': MY_ACCOUNT_HOST
    };

    var canonicalizedHeaders = buildCanonicalizedHeaders( headers );

    // THIS
    var key = buildSharedKeyLite( 'PUT', corsMD5, 'text/plain; charset=UTF-8', canonicalizedHeaders, canonicalizedResource, accountKey);

    // AND THIS, BOTH YIELD THE SAME SERVER RESPONSE
    // var key = buildSharedKeyLite( 'PUT', "", "", canonicalizedHeaders, canonicalizedResource, accountKey);

    headers['Authorization'] = 'SharedKeyLite ' + MY_ACCOUNT_NAME + ':' + key;

    var options = {
        url: url,
        body: MY_CORS_XML,
        headers: headers
    };

    console.log("url : " + url);
    console.log("canonicalizedResource : " + canonicalizedResource);
    console.log("canonicalizedHeaders : " + canonicalizedHeaders);
    console.log("corsMD5 : " + corsMD5);
    console.log("key : " + key);
    console.log("options : " + JSON.stringify(options));

    function onPropertiesSet(error, response, body) {
        if (!error && response.statusCode == 202) {
            console.log("CORS: OK");
        }
        else {
            console.log("CORS: " + response.statusCode);
            console.log("body : " + body);
        }
    }
    request.put(options, onPropertiesSet); // require('request')
};

function buildCanonicalizedHeaders( headers ) {

    var xmsHeaders = [];
    var canHeaders = "";

    for ( var name in headers ) {
        if ( name.indexOf('x-ms-') == 0 ) {
            xmsHeaders.push( name );
        }
    }

    xmsHeaders.sort();

    for ( var i = 0; i < xmsHeaders.length; i++ ) {
        name = xmsHeaders[i];
        canHeaders = canHeaders + name.toLowerCase().trim() + ':' + headers[name] + '\n';
    }
    return canHeaders;
}

function buildSharedKeyLite( verb, contentMD5, contentType, canonicalizedHeaders, canonicalizedResource, accountKey) {

    var stringToSign = verb + "\n" +
        contentMD5 + "\n" +
        contentType + "\n" +
        "" + "\n" + // date is to be empty because we use x-ms-date
        canonicalizedHeaders +
        canonicalizedResource;

    // return crypto.createHmac('sha256', accountKey).update(encodeURIComponent(stringToSign)).digest('base64');
    return crypto.createHmac('sha256', new Buffer(accountKey, 'base64')).update(stringToSign).digest('base64');
}

以下是我从server.js文件中调用此函数的方法：

var setcrosproperties = require('./setcrosproperties.js');
// setCors(MY_ACCOUNT_URL, MY_ACCOUNT_NAME, MY_ACCOUNT_HOST, accountKey)
setcrosproperties.setCors(
    'https://'+process.env['AZURE_STORAGE_ACCOUNT']+'.blob.core.windows.net',
    process.env['AZURE_STORAGE_ACCOUNT'],
    process.env['AZURE_STORAGE_ACCOUNT']+'.blob.core.windows.net',
    process.env['AZURE_STORAGE_ACCESS_KEY']);

我不明白与变量MY_ACCOUNT_UTL（我假设的URL）和MY_ACCOUNT_HOST的差异是什么，所以我对函数的两个参数使用相同的值。

（我删除了“cors”参数，似乎未使用。）

以下是我在控制台中获得的内容：

  

网址：https://NAME_OF_MY_STORAGE_ACCOUNT.blob.core.windows.net/?restype=service&comp=properties   canonicalizedResource：/ NAME_OF_MY_STORAGE_ACCOUNT /？comp = properties   canonicalizedHeaders：x-ms-date：Sun，09 Mar Mar 12:33:41 GMT   X-MS-版本：2013-08-15   corsMD5：+ ij ... w ==   key：sNB ... JrY =   选项：{“url”：“https://NAME_OF_MY_STORAGE_ACCOUNT.blob.core.windows.net/?restype=service&comp=properties”，“body”：“ GET，PUT500x-ms-meta-data ，x-ms-meta-customheaderx-ms-meta-target *，x-ms-meta-customheader2013-08-15“，”header“：{”x-ms-version“：”2013-08-15“，”x-ms-date“：”Sun，2014年3月9日12:33:41 GMT“，”主持人“：”NAME_OF_MY_STORAGE_ACCOUNT.blob.core.windows.net“，”授权“：”SharedKeyLite NAME_OF_MY_STORAGE_ACCOUNT：sNB ... rY =“}}   CORS：403   body：AuthenticationFailed服务器无法验证请求。确保正确形成Authorization标头的值，包括签名。   请求ID：1e6abfe3-e0e8-4b9c-922D-7cb34485eec9   时间：2014-03-09T12：33：41.7262308Z在HTTP请求'sNB中找到的MAC签名... JrY ='与任何计算签名不同。服务器使用以下字符串进行签名：'PUT

     

x-ms-date：太阳报，2014年3月9日12:33:41 GMT   X-MS-版本：2013-08-15   / NAME_OF_MY_STORAGE_ACCOUNT /？排版=属性。

对我在这里做错了什么的想法？谢谢你的帮助

Answer 1

要配置CORS，请使用Node.js的Azure存储库。

你可以npm install azure-storage来获取它。源代码位于https://github.com/Azure/azure-storage-node。

与npm包azure（a.k.a。azure-sdk-for-node）一起使用的那个使用旧的azure-storage-legacy包，它不支持CORS。

您可以使用以下代码设置CORS：

var service = azure.createBlobService();
var serviceProperties = {
  Cors: {
    CorsRule: [{
      AllowedOrigins: ['*'],
      AllowedMethods: ['GET'],
      AllowedHeaders: [],
      ExposedHeaders: [],
      MaxAgeInSeconds: 60
    }]
  }
}; 


service.setServiceProperties(serviceProperties, callback);

Answer 2

请在Content-Type数组中添加Content-MD5和headers，这应该可以解决问题。这是修改后的代码：

var crypto = require('crypto');
var request = require('request');


exports.setCors = function (MY_ACCOUNT_URL, MY_ACCOUNT_NAME, MY_ACCOUNT_HOST, accountKey) {
    var MY_CORS_XML =
    '<?xml version="1.0" encoding="utf-8"?>'+
        '<StorageServiceProperties>'+
            '<Cors>'+
                '<CorsRule>'+
                    '<AllowedOrigins>*</AllowedOrigins>'+
                    '<AllowedMethods>GET,PUT</AllowedMethods>'+
                    '<MaxAgeInSeconds>500</MaxAgeInSeconds>'+
                    '<ExposedHeaders>x-ms-meta-data*,x-ms-meta-customheader</ExposedHeaders>'+
                    '<AllowedHeaders>x-ms-meta-target*,x-ms-meta-customheader</AllowedHeaders>'+
                '</CorsRule>'+
            '</Cors>'+
            '<DefaultServiceVersion>2013-08-15</DefaultServiceVersion>'+
        '</StorageServiceProperties>';


    var url = MY_ACCOUNT_URL + '/?restype=service&comp=properties';
    var canonicalizedResource = '/' + MY_ACCOUNT_NAME + '/?comp=properties';
    var corsMD5 = crypto.createHash('md5' ).update(MY_CORS_XML).digest('base64');
    var date = (new Date()).toUTCString();
    var headers = {
        'x-ms-version': '2013-08-15',
        'x-ms-date': date,
        'Host': MY_ACCOUNT_HOST,
        'Content-Type': 'text/plain; charset=UTF-8',//Added this line
        'Content-MD5': corsMD5,//Added this line
    };

    var canonicalizedHeaders = buildCanonicalizedHeaders( headers );

    // THIS
    var key = buildSharedKeyLite( 'PUT', corsMD5, 'text/plain; charset=UTF-8', canonicalizedHeaders, canonicalizedResource, accountKey);

    // AND THIS, BOTH YIELD THE SAME SERVER RESPONSE
    // var key = buildSharedKeyLite( 'PUT', "", "", canonicalizedHeaders, canonicalizedResource, accountKey);

    headers['Authorization'] = 'SharedKeyLite ' + MY_ACCOUNT_NAME + ':' + key;

    var options = {
        url: url,
        body: MY_CORS_XML,
        headers: headers
    };

    console.log("url : " + url);
    console.log("canonicalizedResource : " + canonicalizedResource);
    console.log("canonicalizedHeaders : " + canonicalizedHeaders);
    console.log("corsMD5 : " + corsMD5);
    console.log("key : " + key);
    console.log("options : " + JSON.stringify(options));

    function onPropertiesSet(error, response, body) {
        if (!error && response.statusCode == 202) {
            console.log("CORS: OK");
        }
        else {
            console.log("CORS: " + response.statusCode);
            console.log("body : " + body);
        }
    }
    request.put(options, onPropertiesSet); // require('request')
};

function buildCanonicalizedHeaders( headers ) {

    var xmsHeaders = [];
    var canHeaders = "";

    for ( var name in headers ) {
        if ( name.indexOf('x-ms-') == 0 ) {
            xmsHeaders.push( name );
        }
    }

    xmsHeaders.sort();

    for ( var i = 0; i < xmsHeaders.length; i++ ) {
        name = xmsHeaders[i];
        canHeaders = canHeaders + name.toLowerCase().trim() + ':' + headers[name] + '\n';
    }
    return canHeaders;
}

function buildSharedKeyLite( verb, contentMD5, contentType, canonicalizedHeaders, canonicalizedResource, accountKey) {

    var stringToSign = verb + "\n" +
        contentMD5 + "\n" +
        contentType + "\n" +
        "" + "\n" + // date is to be empty because we use x-ms-date
        canonicalizedHeaders +
        canonicalizedResource;

    // return crypto.createHmac('sha256', accountKey).update(encodeURIComponent(stringToSign)).digest('base64');
    return crypto.createHmac('sha256', new Buffer(accountKey, 'base64')).update(stringToSign).digest('base64');
}