如何使用JWT for Google Firebase生成身份验证令牌？

Question

所以我试图authenticate the Firebase REST API. 我使用Vapor framework服务器端快速和我安装JWT package。

我正在尝试使用serviceAccountKey.json文件和JWT中的数据生成身份验证令牌。

这里是我试过的代码：

let payload = try JSON(node: [ 
     "iat": Date().timeIntervalSince1970, 
     "exp": Date().timeIntervalSince1970 + 3600, 
     "iss": "client_email from serviceAccountKey.json", 
     "aud": "https://accounts.google.com/o/oauth2/token", 
     "scope": [ 
      "https://www.googleapis.com/auth/firebase.database", 
      "https://www.googleapis.com/auth/userinfo.email" 
     ] 
    ]) 
    let privateKey = "copied from serviceAccountKey.json" 

    let signer = try HS256(bytes: privateKey.bytes) 

    let jwt = try JWT(payload: payload, signer: signer) 
    let token = try jwt.createToken() 
    print(token) 

serviceAccountKey.json

{ 
    "type": "service_account", 
    "project_id": "", 
    "private_key_id": "", 
    "private_key": "", 
    "client_email": "", 
    "client_id": "", 
    "auth_uri": "https://accounts.google.com/o/oauth2/auth", 
    "token_uri": "https://accounts.google.com/o/oauth2/token", 
    "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs", 
    "client_x509_cert_url": "" 
} 

Answer 1

如果你只是想要得到的东西的工作，最好不要使用1.5.0版本

.Package(url: "https://github.com/gtchance/FirebaseSwift.git", Version(1,5,0)), 

并使用遗留的秘密。项目设置>服务帐户>数据库秘密

Answer 2

此时我正在使用Xcode 8.3.3。 Package.swift包含：

let package = Package(
name: "StripePayment", 
dependencies: [ 
    .Package(url: "https://github.com/vapor/vapor.git", majorVersion: 1, minor: 5), 
    .Package(url:"https://github.com/vapor/jwt.git", majorVersion: 0,minor: 8), 
    .Package(url: "https://github.com/SwiftyJSON/SwiftyJSON.git", versions: Version(1, 0, 0)..<Version(3, .max, .max)) 

], 
exclude: [ 
    "Config", 
    "Database", 
    "Localization", 
    "Public", 
    "Resources", 
    "Tests", 
] 
) 

如果你生成你需要记住具备以下，从https://cloud.google.com/storage/docs/authentication采取了服务帐户凭据：您可以通过创建一个OAuth用户端ID在云中创建平台控制台私钥一个服务帐户。您可以使用JSON和PKCS12格式获取私钥：

如果您在Google云端平台之外的生产环境中使用Application Default Credentials，则需要JSON密钥。 JSON密钥不能转换为其他格式。 PKCS12（.p12）受许多不同编程语言和库支持。如果需要，您可以使用OpenSSL将密钥转换为其他格式（see Converting the private key to other formats）。但是，PKCS12密钥不能转换为JSON格式。

注意：您请勿需要在console.cloud.google.com上生成服务帐户。只需按照下面列出的步骤1 ... 6。

1. 转到https://console.firebase.google.com，点击您的项目，旁边的概述点击滚轮设置，单击服务帐户，滚动到页面底部，然后点击生成新的私钥。

2. 转换的第12页（a.k.a PKCS12）文件。质子交换膜（a.k.a PKCS1）使用OpenSSL

   cat /path/to/xxxx-privatekey.p12 | openssl pkcs12 -nodes -nocerts -passin pass:notasecret | openssl rsa > /path/to/secret.pem

3. 去GitHub搜索VaporJWT和Xcode中导入。它将帮助您创建一个签名的JSON Web令牌。

4. 在这个github页面上，您将学习如何提取RSA使用的私钥。

5. 转换。质子交换膜为DER
   openssl rsa -in /path/to/secret.pem -outform der -out /path/to/private.der

6. 转换.der来。base64
   openssl base64 -in /path/to/private.der -out /path/to/Desktop/private.txt
   在private.txt中，您有用base64编码的私钥，您最终可以使用它来签署JWT。然后，您可以使用签名的JWT拨打Google API电话。

``

import Vapor 
import VaporJWT 

let drop = Droplet() 
var tokenID:String! 

//set current date 
let dateNow = Date() 

// assign to expDate the validity period of the token returned by OAuth server (3600 seconds) 
var expDate = String(Int(dateNow.timeIntervalSince1970 + (60 * 60))) 

// assign to iatDate the time when the call was made to request an access token 
var iatDate = String(Int(dateNow.timeIntervalSince1970)) 

// the header of the JSON Web Token (first part of the JWT) 
let headerJWT = ["alg":"RS256","typ":"JWT"] 

// the claim set of the JSON Web Token 
let jwtClaimSet = 
    ["iss":"firebase-adminsdk-c7i38@fir-30c9e.iam.gserviceaccount.com", 
    "scope":"https://www.googleapis.com/auth/firebase.database", 
    "aud":"https://www.googleapis.com/oauth2/v4/token", 
    "exp": expDate, 
    "iat": iatDate] 


//Using VaporJWT construct a JSON Web Token and sign it with RS256 algorithm 
//The only signing algorithm supported by the Google OAuth 2.0 Authorization  
//Server is RSA using SHA-256 hashing algorithm. 

    let jwt = try JWT(headers: Node(node: headerJWT), payload: Node(node:jwtClaimSet), encoding: Base64URLEncoding(), signer: RS256(encodedKey: "copy paste here what you have in private.txt as explained at point 7 above ")) 

// create the JSON Web Token 
    let JWTtoken = try jwt.createToken() 
let grant_type = "urn:ietf:params:oauth:grant-type:jwt-bearer" // this value must not be changed 
    let unreserved = "*-._" 
    let allowed = NSMutableCharacterSet.alphanumeric() 
    allowed.addCharacters(in: unreserved) 

// percent or URL encode grant_type 
let grant_URLEncoded = grant_type.addingPercentEncoding(withAllowedCharacters: allowed as CharacterSet) 

// create a string made of grant_type and assertion. NOTE!!! only grant_type's value is URL encoded. 
//JSON Web Token value does not need to be URL encoded 
    var fullString = "grant_type=\(grant_URLEncoded!)&assertion=\(JWTtoken)" 


    //pass fullString in the body parameter 
    drop.get("call") { request in 


    let response = try drop.client.post("https://www.googleapis.com/oauth2/v4/token", headers: ["Content-Type": "application/x-www-form-urlencoded"], query: [:],body: fullString) 

    let serverResp = response.headers 
    let serverBody = response.body.bytes 
     let serverJson = try JSON(bytes: serverBody!) 
     print(serverJson) 

    return "Success"