使用AWS IOS SDK验证用户身份

我创建了一个lamdba函数，它执行以下操作：

var param =
{
    IdentityPoolId: "us-east-1:the-full-identity-id",
    Logins: {} // To have provider name in a variable
};
param.Logins["com.test.website.login"] = userIdICreatedAndStoredInDynamoDB;

cognitoidentity.getOpenIdTokenForDeveloperIdentity(param,
function(err, data)
{
    if (err) return fn(err); // an error occurred
    else fn(null, data.IdentityId, data.Token); // successful response
});

它返回该用户的标识ID和令牌。所有内容都是使用IAM角色和AWS Cognito标识设置的，并且似乎在控制台中进行身份验证

我有两个问题：

如何在应用程序中测试用户是否经过身份验证？我将标识ID和令牌保存在应用程序设备中

身份验证持续多长时间？我希望用户保持登录状态。我使用的大多数应用程序都是这样工作的，并一直保持登录状态，直到它们退出

---

谢谢。

要测试他们是否登录，您需要设置一个服务，根据Cognito检查令牌。快速而肮脏的方法是设置一个基本lambda，通过API网关将其公开，授权者指向您的用户标识池。lambda需要做的就是返回http200，因为您真正要检查的是授权者。然后让您的应用程序get/post/etc访问该API URL，并带有“Authorization”标题：$ACCESS\u令牌。它要么在成功时回退200，要么返回未经授权的消息

您的Cognito令牌只能使用一个小时，但您可以刷新令牌以保持用户登录。当用户进行身份验证时，他们得到三个令牌：ID、Access和Refresh令牌。您可以使用后者来请求新的访问令牌

---

回答第一个问题，请参见：

：

如何在应用程序中测试用户是否经过身份验证？我将

identityId

和令牌保存在应用程序设备中

您可以通过创建“自定义授权人”来测试身份验证

创建新函数时，可以在Lambda示例函数中找到AWS示例函数 （如果您过滤到NodeJS 4.3函数，则它位于后面）

或者你可以看看哪一个是相同的东西，只是在GitHub上

我在这里做了一些修改：

"use strict";

const
    codes  = {
        100: "Continue", 101: "Switching Protocols", 102: "Processing",
        200: "OK", 201: "Created", 202: "Accepted", 203: "Non-Authoritative Information", 204: "No Content", 205: "Reset Content", 206: "Partial Content", 207: "Multi-Status", 208: "Already Reported", 226: "IM Used",
        300: "Multiple Choices", 301: "Moved Permanently", 302: "Found", 303: "See Other", 304: "Not Modified", 305: "Use Proxy", 307: "Temporary Redirect", 308: "Permanent Redirect",
        400: "Bad Request", 401: "Unauthorized", 402: "Payment Required", 403: "Forbidden", 404: "Not Found", 405: "Method Not Allowed", 406: "Not Acceptable", 407: "Proxy Authentication Required", 408: "Request Timeout", 409: "Conflict", 410: "Gone", 411: "Length Required", 412: "Precondition Failed", 413: "Payload Too Large", 414: "URI Too Long",
        415: "Unsupported Media Type", 416: "Range Not Satisfiable", 417: "Expectation Failed", 418: "I'm a teapot", 421: "Misdirected Request", 422: "Unprocessable Entity", 423: "Locked", 424: "Failed Dependency", 425: "Unordered Collection", 426: "Upgrade Required", 428: "Precondition Required", 429: "Too Many Requests", 431: "Request Header Fields Too Large", 451: "Unavailable For Legal Reasons",
        500: "Internal Server Error", 501: "Not Implemented", 502: "Bad Gateway", 503: "Service Unavailable", 504: "Gateway Timeout", 505: "HTTP Version Not Supported", 506: "Variant Also Negotiates", 507: "Insufficient Storage", 508: "Loop Detected", 509: "Bandwidth Limit Exceeded", 510: "Not Extended", 511: "Network Authentication Required"
    },
    resp   = ( statusCode, data ) => ( { statusCode, message: codes[ statusCode ], data } ),
    AWS    = require( "aws-sdk" ),
    crypto = require( "crypto" ),
    COG    = new AWS.CognitoIdentity(),
    token  = {
        algorithm: "aes-256-ctr",
        encrypt: item => {
            item = JSON.stringify( item );
            let cipher = crypto.createCipher( token.algorithm, process.env.PoolId ),
                crypted = cipher.update( item, 'utf8', 'base64' );
            crypted += cipher.final( 'base64' );
            return crypted;
        },
        decrypt: item => {
            let decipher = crypto.createDecipher( token.algorithm, process.env.PoolId ),
                dec = decipher.update( item, 'base64', 'utf8' );
            dec += decipher.final( 'utf8' );
            return dec;
        }
    };

function AuthPolicy( principal, awsAccountId, apiOptions ) {
    this.awsAccountId = awsAccountId;
    this.principalId = principal;
    this.version = '2012-10-17';
    this.pathRegex = new RegExp( '^[/.a-zA-Z0-9-\*]+$' );
    this.allowMethods = [];
    this.denyMethods = [];

    if( !apiOptions || !apiOptions.restApiId ) this.restApiId = '*';
    else this.restApiId = apiOptions.restApiId;
    
    if( !apiOptions || !apiOptions.region ) this.region = '*';
    else this.region = apiOptions.region;
    
    if( !apiOptions || !apiOptions.stage ) this.stage = '*';
    else this.stage = apiOptions.stage;
}

AuthPolicy.HttpVerb = {
    GET: 'GET',
    POST: 'POST',
    PUT: 'PUT',
    PATCH: 'PATCH',
    HEAD: 'HEAD',
    DELETE: 'DELETE',
    OPTIONS: 'OPTIONS',
    ALL: '*',
};

AuthPolicy.prototype = ( function AuthPolicyClass() {

    function addMethod( effect, verb, resource, conditions ) {
        if( verb !== '*' && !Object.prototype.hasOwnProperty.call( AuthPolicy.HttpVerb, verb ) ) {
            throw new Error( `Invalid HTTP verb ${verb}. Allowed verbs in AuthPolicy.HttpVerb` );
        }

        if( !this.pathRegex.test( resource ) )
            throw new Error( `Invalid resource path: ${resource}. Path should match ${this.pathRegex}` );

        let cleanedResource = resource;
        
        if( resource.substring( 0, 1 ) === '/' )
            cleanedResource = resource.substring( 1, resource.length );
        
        const resourceArn = `arn:aws:execute-api:${this.region}:${this.awsAccountId}:${this.restApiId}/${this.stage}/${verb}/${cleanedResource}`;

        if( effect.toLowerCase() === 'allow' )
            this.allowMethods.push( {
                resourceArn,
                conditions,
            } );
        else if( effect.toLowerCase() === 'deny' )
            this.denyMethods.push( {
                resourceArn,
                conditions,
            } );
    }
    
    function getEmptyStatement( effect ) {
        const statement = {};
        statement.Action = 'execute-api:Invoke';
        statement.Effect = effect.substring( 0, 1 ).toUpperCase() + effect.substring( 1, effect.length ).toLowerCase();
        statement.Resource = [];

        return statement;
    }
    
    function getStatementsForEffect( effect, methods ) {
        const statements = [];

        if( methods.length > 0 ) {
            const statement = getEmptyStatement( effect );

            for( let i = 0; i < methods.length; i++ ) {
                const curMethod = methods[ i ];
                if( curMethod.conditions === null || curMethod.conditions.length === 0 )
                    statement.Resource.push( curMethod.resourceArn );
                else {
                    const conditionalStatement = getEmptyStatement( effect );
                    conditionalStatement.Resource.push( curMethod.resourceArn );
                    conditionalStatement.Condition = curMethod.conditions;
                    statements.push( conditionalStatement );
                }
            }

            if( statement.Resource !== null && statement.Resource.length > 0 )
                statements.push( statement );
        }
        return statements;
    }

    return {
        constructor: AuthPolicy,
        allowAllMethods() {
            addMethod.call( this, 'allow', '*', '*', null );
        },
        denyAllMethods() {
            addMethod.call( this, 'deny', '*', '*', null );
        },
        allowMethod( verb, resource ) {
            addMethod.call( this, 'allow', verb, resource, null );
        },
        denyMethod( verb, resource ) {
            addMethod.call( this, 'deny', verb, resource, null );
        },
        allowMethodWithConditions( verb, resource, conditions ) {
            addMethod.call( this, 'allow', verb, resource, conditions );
        },
        denyMethodWithConditions( verb, resource, conditions ) {
            addMethod.call( this, 'deny', verb, resource, conditions );
        },
        build() {
            if( ( !this.allowMethods || this.allowMethods.length === 0 ) &&
                ( !this.denyMethods || this.denyMethods.length === 0 ) )
                throw new Error( 'No statements defined for the policy' );

            const policy = {}, doc = {};
            policy.principalId = this.principalId;

            doc.Version = this.version;
            doc.Statement = [];
            doc.Statement = doc.Statement.concat( getStatementsForEffect.call( this, 'Allow', this.allowMethods ) );
            doc.Statement = doc.Statement.concat( getStatementsForEffect.call( this, 'Deny', this.denyMethods ) );

            policy.policyDocument = doc;

            return policy;
        },
    };
} () );


exports.handler = ( event, context, cb ) => {
    const
        principalId      = process.env.principalId,
        tmp              = event.methodArn.split( ':' ),
        apiGatewayArnTmp = tmp[ 5 ].split( '/' ),
        awsAccountId     = tmp[ 4 ],
        apiOptions       = {
            region: tmp[ 3 ],
            restApiId: apiGatewayArnTmp[ 0 ],
            stage: apiGatewayArnTmp[ 1 ]
        },
        policy = new AuthPolicy( principalId, awsAccountId, apiOptions );

    let response;

    if( !event.authorizationToken || typeof event.authorizationToken !== "string" )
        response = resp( 401 );

    let item = token.decrypt( event.authorizationToken );

    try { item = resp( 100, JSON.parse( item ) ); }
    catch( e ) { item = resp( 401 ); }

    if( item.statusCode !== 100 )
        response = resp( 401 );
    else if( item.data.Expiration <= new Date().getTime() )
        response = resp( 407 );
    else
        response = resp( 100 );

    if( response.statusCode >= 400 ) {
        policy.denyAllMethods();
        const authResponse = policy.build();
        authResponse.context = response;
        cb( null, authResponse );
    } else {
        COG.getCredentialsForIdentity( {
            IdentityId: item.data.IdentityId,
            Logins: {
                'cognito-identity.amazonaws.com': item.data.Token
            }
        }, ( e, d ) => {
            if( e ) {
                policy.denyAllMethods();
                response = resp( 401 );
            } else {
                policy.allowMethod( AuthPolicy.HttpVerb.GET, "/user" );
                policy.allowMethod( AuthPolicy.HttpVerb.DELETE, "/user" );
                response = resp( 202 );
            }

            const authResponse = policy.build();
            authResponse.context = response;
            cb( null, authResponse );
        } );
    }
};

基本上，我把一些我想要的东西包在一个加密的简单密钥中，这样我就可以把我所有的信息传递给easy peasy。 （我将身份池作为散列传递，以使其更酷、更简单，只要您从不将身份池ID发送到前端，我们就可以了！）

自定义授权器需要一个令牌，而不是一个JSON块，您可以说它是一个“令牌”或其他东西（您可以这样做，但它看起来很愚蠢）

因此，我们有一个统一的令牌被传入，我调用

decrypt

函数将其展开（稍后我将展示加密示例）

现在有些人可能会说“哦，那不是真正的加密，它很容易被破解”——我的回答是：“嗯，它本来是未加密的原始文本，为什么不让它变得简单呢？”

好的，现在您看到了这一部分，请转到函数的底部

let response;

if( !event.authorizationToken || typeof event.authorizationToken !== "string" )
    response = resp( 401 );

let item = token.decrypt( event.authorizationToken );

try { item = resp( 100, JSON.parse( item ) ); }
catch( e ) { item = resp( 401 ); }

if( item.statusCode !== 100 )
    response = resp( 401 );
else if( item.data.Expiration <= new Date().getTime() )
    response = resp( 407 );
else
    response = resp( 100 );

if( response.statusCode >= 400 ) {
    policy.denyAllMethods();
    const authResponse = policy.build();
    authResponse.context = response;
    cb( null, authResponse );
} else {
    COG.getCredentialsForIdentity( {
        IdentityId: item.data.IdentityId,
        Logins: {
            'cognito-identity.amazonaws.com': item.data.Token
        }
    }, ( e, d ) => {
        if( e ) {
            policy.denyAllMethods();
            response = resp( 401 );
        } else {
            policy.allowMethod( AuthPolicy.HttpVerb.GET, "/user" );
            policy.allowMethod( AuthPolicy.HttpVerb.DELETE, "/user" );
            response = resp( 202 );
        }

        const authResponse = policy.build();
        authResponse.context = response;
        cb( null, authResponse );
    } );
}

请注意：

持续时间

部分

这是你第二个问题的答案：

身份验证持续多长时间？我希望用户保持登录状态。我使用的大多数应用程序都是这样工作并保持登录状态，直到它们退出

您可以使用他们的电子邮件或任何您想要识别他们的东西创建一个

OpenIdToken

，并且

TokenDuration

的持续时间为秒。我建议您创建一周或两周，但如果您想要一年或更长的时间，则可以使用

31536000

。另一种方法是创建一个只提供y的函数当出现

407

场景时，您可以使用唯一的方法调用

allowMethod（POST，/updateCreds）；

或类似的方法，而不是在授权者中调用

denyAll

。这样，您可以每隔一段时间刷新他们的内容

这方面的伪标准是：

删除：

if( response.statusCode >= 400 )
else

并且做：

if( statusCode >= 400 )
    denyAll
else if( statusCode === 407 )
    allow refresh function
else
    allow everything else

---

希望这能有所帮助！

我在用户池可用之前就开始了这项工作，因此我的情况有所不同。我只获得了一个标识ID和令牌。改为使用联合标识。仍在搜索一个好的答案。有关详细信息，请参阅下面的评论。

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": "execute-api:Invoke",
            "Effect": "Deny",
            "Resource": [
                "arn:aws:execute-api:<region>:<Account_ID>:<API_ID>/<Stage>/*/*"
            ]
        }
    ]
}

token.getToken = obj => {
    return new Promise( ( res, rej ) => {
        COG.getOpenIdTokenForDeveloperIdentity( {
            IdentityPoolId: process.env.PoolId,
            Logins: {
                "com.whatever.developerIdthing": obj.email
            },
            TokenDuration: duration
        }, ( e, r ) => {
            r.Expiration = new Date().getTime() + ( duration * 1000 );
            if( e ) rej( e );
            else res( token.encrypt( r ) );
        } );
    } );
};

if( response.statusCode >= 400 )
else

if( statusCode >= 400 )
    denyAll
else if( statusCode === 407 )
    allow refresh function
else
    allow everything else