Firebase 3：使用.net和c＃创建自定义身份验证令牌-Java 学习之路

我正在尝试使用自定义令牌实施Firebase 3身份验证机制（如https：// firebase.google.com/docs/auth/server/create-custom-tokens中所述） .

我的服务器是ASP.NET MVC Application .

所以根据说明（https://firebase.google.com/docs/server/setup）我've created a service account for my Firebase application and generated a key in ' .p12'格式 .

之后根据此处的说明（https://firebase.google.com/docs/auth/server/create-custom-tokens#create_custom_tokens_using_a_third-party_jwt_library），我尝试生成自定义令牌，并使用上一步收到的密钥对其进行签名 . 对于令牌生成，我使用了Microsoft的SystemIdentityModel.Tokens.Jwt库，因此代码如下所示：

var now = DateTime.UtcNow;
var tokenHandler = new JwtSecurityTokenHandler();
var key = new X509AsymmetricSecurityKey(new X509Certificate2(p12path, p12pwd));
var signinCredentials = new SigningCredentials(key, "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256", "http://www.w3.org/2001/04/xmlenc#rsa-sha256");
Int32 nowInUnixTimestamp = (Int32)(now.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;

var token = tokenHandler.CreateToken(
            issuer: serviceAccountEmail,
            audience: "https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit",                
            signingCredentials: signinCredentials,
            subject: new ClaimsIdentity(new Claim[]
                    {
                    new Claim("sub", serviceAccountEmail),
                    new Claim("iat", nowInUnixTimestamp.ToString()),
                    new Claim("exp", (nowInUnixTimestamp + (60*60)).ToString()),
                    new Claim("uid", uid)
                    })
            );

var tokenString = tokenHandler.WriteToken(token);

然后尝试使用Firebase Javascript SDK在React Native应用程序中登录用户，使用以下代码：

//omitting initialization code
firebase.auth().signInWithCustomToken(firebaseJWT).catch(function(error) {
            console.log('Error authenticating Firebase user. Code: ' + error.code + ' Message: ' + error.message);            
        });

但Firebase的错误说：

验证Firebase用户时出错 . 代码：auth / invalid-custom-token消息：自定义标记格式不正确 . 请查看文档 .

尝试为令牌到期控制添加不同的声明也没有帮助 .

此外，我尝试使用“dvsekhvalnov / jose-jwt”库生成令牌，但无法使用“RS256”算法 .

所以问题是：

Any suggestion on what am I doing wrong?

4 回答

这个纯.NET解决方案适用于我，使用Org.BouncyCastle（https://www.nuget.org/packages/BouncyCastle/）和Jose.JWT（https://www.nuget.org/packages/jose-jwt/）库 .

我按照以下步骤操作：

在Firebase控制台中，单击项目名称旁边左上角的'cog'图标，然后单击'Permissions' .
在IAM和管理员页面，单击左侧的'Service Accounts'
单击顶部的'Create Service Account'，输入'Service Account Name'，在角色选择中选择'Project->Editor'，勾选'Furnish a new private key'复选框并选择JSON
单击'Create'并下载服务帐户JSON文件并确保其安全 .
在合适的文本编辑器中打开服务帐户JSON文件，并将值放入以下代码中：

// private_key from the Service Account JSON file
public static string firebasePrivateKey=@"-----BEGIN PRIVATE KEY-----\nMIIE...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n...\n-----END PRIVATE KEY-----\n";

// Same for everyone
public static string firebasePayloadAUD="https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit";

// client_email from the Service Account JSON file
public static string firebasePayloadISS="serviceaccountname@projectname.iam.gserviceaccount.com";
public static string firebasePayloadSUB="serviceaccountname@projectname.iam.gserviceaccount.com";

// the token 'exp' - max 3600 seconds - see https://firebase.google.com/docs/auth/server/create-custom-tokens
public static int firebaseTokenExpirySecs=3600;

private static RsaPrivateCrtKeyParameters _rsaParams;
private static object _rsaParamsLocker=new object();

void Main() {
    // Example with custom claims
    var uid="myuserid";
    var claims=new Dictionary<string, object> {
        {"premium_account", true}
    };
    Console.WriteLine(EncodeToken(uid, claims));
}

public static string EncodeToken(string uid, Dictionary<string, object> claims) {
    // Get the RsaPrivateCrtKeyParameters if we haven't already determined them
    if (_rsaParams == null) {
        lock (_rsaParamsLocker) {
            if (_rsaParams == null) {
                StreamReader sr = new StreamReader(GenerateStreamFromString(firebasePrivateKey.Replace(@"\n","\n")));
                var pr = new Org.BouncyCastle.OpenSsl.PemReader(sr);
                _rsaParams = (RsaPrivateCrtKeyParameters)pr.ReadObject();
            }
        }
    }

    var payload = new Dictionary<string, object> {
        {"claims", claims}
        ,{"uid", uid}
        ,{"iat", secondsSinceEpoch(DateTime.UtcNow)}
        ,{"exp", secondsSinceEpoch(DateTime.UtcNow.AddSeconds(firebaseTokenExpirySecs))}
        ,{"aud", firebasePayloadAUD}
        ,{"iss", firebasePayloadISS}
        ,{"sub", firebasePayloadSUB}
    };

    return Jose.JWT.Encode(payload, Org.BouncyCastle.Security.DotNetUtilities.ToRSA(_rsaParams), JwsAlgorithm.RS256);
}

private static long secondsSinceEpoch(DateTime dt) {
    TimeSpan t = dt - new DateTime(1970, 1, 1);
    return (long)t.TotalSeconds;
}

private static Stream GenerateStreamFromString(string s) {
    MemoryStream stream = new MemoryStream();
    StreamWriter writer = new StreamWriter(stream);
    writer.Write(s);
    writer.Flush();
    stream.Position = 0;
    return stream;
}

为了在IIS中工作，我需要更改应用程序的池标识并将“加载用户配置文件”设置为true .

回复于 2024-05-15T00:23:54+08:00

到目前为止还没有找到问题的直接答案，所以现在最终得到以下解决方案：

Using instruction here使用服务帐户详细信息生成了一个JSON文件，并使用Firebase服务器SDK创建了一个基本的Node.js服务器，该服务器SDK使用以下代码为Firebase生成正确的自定义令牌：

var http = require('http');
var httpdispatcher = require('httpdispatcher');
var firebase = require('firebase');

var config = {
    serviceAccount: {
    projectId: "{projectId}",
    clientEmail: "{projectServiceEmail}",
    privateKey: "-----BEGIN PRIVATE KEY----- ... ---END PRIVATE KEY-----\n"
  },
  databaseURL: "https://{projectId}.firebaseio.com"
};

firebase.initializeApp(config);    

const PORT=8080; 

httpdispatcher.onGet("/firebaseCustomToken", function(req, res) {
    var uid = req.params.uid;

    if (uid) {
        var customToken = firebase.auth().createCustomToken(uid);
        res.writeHead(200, {'Content-Type': 'application/json'});
        res.end(JSON.stringify({'firebaseJWT' : customToken}));
    } else {
        res.writeHead(400, {'Content-Type': 'text/plain'});
        res.end('No uid parameter specified');
    }
});    

function handleRequest(request, response){
     try {
        //log the request on console
        console.log(request.url);
        //Disptach
        httpdispatcher.dispatch(request, response);
    } catch(err) {
        console.log(err);
    }    
}

//create a server
var server = http.createServer(handleRequest);

//start our server
server.listen(PORT, function(){       
    console.log("Server listening on: http://localhost:%s", PORT);
});

也许有人会觉得这很有帮助 .

回复于 2024-05-15T00:23:54+08:00

@ Elliveny的代码在本地工作，但在azure中抛出一个错误：“系统找不到指定的文件” . 由于我已经更改了一点代码，现在可以在两个服务器上运行 .

private string EncodeToken(string uid, Dictionary<string, object> claims)
    {

        string jwt = string.Empty;
        RsaPrivateCrtKeyParameters _rsaParams;

        using (StreamReader sr = new StreamReader(GenerateStreamFromString(private_key.Replace(@"\n", "\n"))))
        {
            var pr = new Org.BouncyCastle.OpenSsl.PemReader(sr);
            _rsaParams = (RsaPrivateCrtKeyParameters)pr.ReadObject();
        }


        using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
        {
            Dictionary<string, object> payload = new Dictionary<string, object> {
                {"claims", claims}
                ,{"uid", uid}
                ,{"iat", secondsSinceEpoch(DateTime.UtcNow)}
                ,{"exp", secondsSinceEpoch(DateTime.UtcNow.AddSeconds(firebaseTokenExpirySecs))}
                ,{"aud", firebasePayloadAUD}
                ,{"iss", client_email}
                ,{"sub", client_email}
            };

            RSAParameters rsaParams = DotNetUtilities.ToRSAParameters(_rsaParams);
            rsa.ImportParameters(rsaParams);
            jwt = JWT.Encode(payload, rsa, Jose.JwsAlgorithm.RS256);
        }

        return jwt;

    }

回复于 2024-05-15T00:23:54+08:00

@ Elliveny的回答对我很有帮助 . 我在.NET Core 2.0应用程序中使用它，并 Build 在已接受的答案上，将此解决方案转换为可在app services容器中注册为singleton依赖项的类，以及通过构造函数传递的配置，以便我们可以将.NET秘密用于本地开发配置和环境变量以进行生产环境配置 .

我还整理了一下流处理 .

Note for .NET Core devs - 你需要使用Portable.BouncyCastle

您可以通过使用Jwt.IO解析输出JWT标记来测试编码结果

using Jose;
using Org.BouncyCastle.Crypto.Parameters;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

public class FirebaseTokenGenerator
{
    // private_key from the Service Account JSON file
    public static string firebasePrivateKey;

    // Same for everyone
    public static string firebasePayloadAUD = "https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit";

    // client_email from the Service Account JSON file
    public static string firebasePayloadISS;
    public static string firebasePayloadSUB;

    // the token 'exp' - max 3600 seconds - see https://firebase.google.com/docs/auth/server/create-custom-tokens
    public static int firebaseTokenExpirySecs = 3600;

    private static RsaPrivateCrtKeyParameters _rsaParams;
    private static object _rsaParamsLocker = new object();

    public FirebaseTokenGenerator(string privateKey, string clientEmail)
    {
        firebasePrivateKey = privateKey ?? throw new ArgumentNullException(nameof(privateKey));
        firebasePayloadISS = clientEmail ?? throw new ArgumentNullException(nameof(clientEmail));
        firebasePayloadSUB = clientEmail;
    }

    public static string EncodeToken(string uid)
    {
        return EncodeToken(uid, null);
    }

    public static string EncodeToken(string uid, Dictionary<string, object> claims)
    {
        // Get the RsaPrivateCrtKeyParameters if we haven't already determined them
        if (_rsaParams == null)
        {
            lock (_rsaParamsLocker)
            {
                if (_rsaParams == null)
                {
                    using (var streamWriter = WriteToStreamWithString(firebasePrivateKey.Replace(@"\n", "\n")))
                    {
                        using (var sr = new StreamReader(streamWriter.BaseStream))
                        {
                            var pr = new Org.BouncyCastle.OpenSsl.PemReader(sr);
                            _rsaParams = (RsaPrivateCrtKeyParameters)pr.ReadObject();
                        }
                    }
                }
            }
        }

        var payload = new Dictionary<string, object> {
        {"uid", uid}
        ,{"iat", SecondsSinceEpoch(DateTime.UtcNow)}
        ,{"exp", SecondsSinceEpoch(DateTime.UtcNow.AddSeconds(firebaseTokenExpirySecs))}
        ,{"aud", firebasePayloadAUD}
        ,{"iss", firebasePayloadISS}
        ,{"sub", firebasePayloadSUB}
    };

        if (claims != null && claims.Any())
        {
            payload.Add("claims", claims);
        }

        return JWT.Encode(payload, Org.BouncyCastle.Security.DotNetUtilities.ToRSA(_rsaParams), JwsAlgorithm.RS256);
    }


    private static long SecondsSinceEpoch(DateTime dt)
    {
        TimeSpan t = dt - new DateTime(1970, 1, 1);
        return (long) t.TotalSeconds;
    }

    private static StreamWriter WriteToStreamWithString(string s)
    {
        MemoryStream stream = new MemoryStream();
        StreamWriter writer = new StreamWriter(stream);
        writer.Write(s);
        writer.Flush();
        stream.Position = 0;
        return writer;
    }
}

回复于 2024-05-15T00:23:54+08:00

Firebase 3：使用.net和c＃创建自定义身份验证令牌

4 回答

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