如何从iOS应用程序内的Firebase云函数设置和访问环境变量（专用api密钥）

我使用Firebase作为后端、远程通知，并在iOS应用程序中使用谷歌地图和Places API。一切正常，但我想

要发送远程通知，我需要Firebase的服务器密钥；要访问Google Maps和Places API，我需要他们的API凭据

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    static var fbServerKey = "someReallyLongFirebaseServerKey"

    override init() {
        super.init()

        Messaging.messaging().delegate = self
        FirebaseApp.configure()

        GMSPlacesClient.provideAPIKey("my_Places_API_Key") // places api credential key
        GMSServices.provideAPIKey("my_Maps_API_Key") // maps api credential key

        GMSPlacesClient.openSourceLicenseInfo()
        GMSServices.openSourceLicenseInfo()
        GADMobileAds.sharedInstance().start(completionHandler: nil)    
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    }
}

要发送推送通知，我从AppDelegate访问

fbServerKey

：

let fbServerKey = AppDelegate.fbServerKey // *** 1. the server key is accessed here and used below ***

var params = [String: Any]() // add keys and values to params

var request = URLRequest(url: URL(string: "https://fcm.googleapis.com/fcm/send")!)
request.httpMethod = "POST"

// *** 2. the server key is used HERE ***
request.setValue("key=\(fbServerKey)", forHTTPHeaderField: "Authorization")

let task = URLSession.shared.dataTask(with: request) { (data, response, error) in ...

我有我的Firebase规则，但是如果你看上面的代码，fbServerKey和maps/places API凭证都是纯文本的

为了避免这个问题，我转而使用CloudKit：

// these keys are all set prior to going live and won't be inside the user's applications
NSUbiquitousKeyValueStore().set("someReallyLongFirebaseServerKey", forKey: "fbServerKey")
NSUbiquitousKeyValueStore().set("my_Places_API_Key", forKey: "placesAPIKey")
NSUbiquitousKeyValueStore().set("my_Maps_API_Key", forKey: "mapsAPIKey")
NSUbiquitousKeyValueStore().synchronize()

要检索密钥，请执行以下操作：

static var fbServerKey = NSUbiquitousKeyValueStore()string(forKey: "fbServerKey")

GMSPlacesClient.provideAPIKey(NSUbiquitousKeyValueStore()string(forKey: "placesAPIKey"))
GMSServices.provideAPIKey(NSUbiquitousKeyValueStore()string(forKey: "mapsAPIKey"))

这里的问题是，如果用户未连接到iCloud，他们将无法访问密钥。

现在我正在切换到Firebase云功能。问题是我不清楚如何使用它

1-在终端I

cd

中，转到我的Xcode项目文件夹并运行

// $ firebase init functions *** I initially used this command but DO NOT RUN THIS line >firebase init functions<. Read the first comment below from @DougStevenson for the reason to avoid it
$ npm install -g firebase-tools
$ npm install --save firebase-functions@latest

4-在提供的

functions/index.js

文件夹中，我添加了一些代码来设置步骤3中的代码

const functions = require('firebase-functions'); // already present
// don't know what to add here???

5-要部署我运行的代码，请执行以下操作：

$ firebase deploy --only functions

6-既然代码在云中，我可以从我的应用程序中调用代码来安全访问密钥

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    static var fbServerKey = somehow_Call_The_Firebase_GetFunction_For_This_Server_Key

    override init() {
        super.init()

        Messaging.messaging().delegate = self
        FirebaseApp.configure()

        GMSPlacesClient.provideAPIKey(somehow_Call_The_Firebase_GetFunction_For_This_Places_Key) // places api credential key
        GMSServices.provideAPIKey(somehow_Call_The_Firebase_GetFunction_For_This_Maps_Key) // maps api credential key

        GMSPlacesClient.openSourceLicenseInfo()
        GMSServices.openSourceLicenseInfo()
        GADMobileAds.sharedInstance().start(completionHandler: nil)    
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    }
}

---

我需要步骤3、4和6的帮助

我不会在我的xcode项目中运行

firebase init

。我会把它放在一个单独的位置，这样它就不可能和xcode的东西发生冲突。好的，谢谢道格，我将从我的问题中删除它。我不知道

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    static var fbServerKey = somehow_Call_The_Firebase_GetFunction_For_This_Server_Key

    override init() {
        super.init()

        Messaging.messaging().delegate = self
        FirebaseApp.configure()

        GMSPlacesClient.provideAPIKey(somehow_Call_The_Firebase_GetFunction_For_This_Places_Key) // places api credential key
        GMSServices.provideAPIKey(somehow_Call_The_Firebase_GetFunction_For_This_Maps_Key) // maps api credential key

        GMSPlacesClient.openSourceLicenseInfo()
        GMSServices.openSourceLicenseInfo()
        GADMobileAds.sharedInstance().start(completionHandler: nil)    
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    }
}