Added support for reading service account from JSON string env variable.

README.md

@@ -54,20 +54,26 @@ func configure(_ app: Application) throws {
     app.fcm.configuration = .envServiceAccountKey
 
     /// case 2
+    /// with service account json string
+    /// put into your environment variable the following key:
+    /// FCM_SERVICE_ACCOUNT_KEY="{"prohect_id": "my_project123",...}"
+    app.fcm.configuration = .envServiceAccountKey
+
+    /// case 3
     /// put into your environment variables the following keys:
     /// FCM_EMAIL=...          // `client_email` in service.json
     /// FCM_PROJECT_ID=...     // `project_id` in service.json
     /// FCM_PRIVATE_KEY=...    // `private_key` in service.json
     app.fcm.configuration = .envServiceAccountKeyFields
 
-    /// case 3
+    /// case 4
     /// put into your environment variables the following keys:
     /// FCM_EMAIL=...
     /// FCM_PROJECT_ID=...
     /// FCM_KEY_PATH=path/to/key.pem
     app.fcm.configuration = .envCredentials
 
-    /// case 4
+    /// case 5
     /// manually
     app.fcm.configuration = .init(email: "...", projectId: "...", key: "...")
 }

Sources/FCM/FCMConfiguration.swift

@@ -38,6 +38,15 @@ public struct FCMConfiguration {
         self.senderId = s.sender_id ?? Environment.get("FCM_SENDER_ID")
     }
 
+    public init (fromJSON json: String) {
+        let s = Self.parseServiceAccount(from: json)
+        self.email = s.client_email
+        self.projectId = s.project_id
+        self.key = s.private_key
+        self.serverKey = s.server_key ?? Environment.get("FCM_SERVER_KEY")
+        self.senderId = s.sender_id ?? Environment.get("FCM_SENDER_ID")
+    }
+
     // MARK: Static initializers
 
     /// It will try to read
@@ -60,9 +69,11 @@ public struct FCMConfiguration {
 
     /// It will try to read path to service account key from environment variables
     public static var envServiceAccountKey: FCMConfiguration {
-        guard let path = Environment.get("FCM_SERVICE_ACCOUNT_KEY_PATH")
-            else { fatalError("FCM envServiceAccountKey not set") }
-        return .init(pathToServiceAccountKey: path)
+        if let path = Environment.get("FCM_SERVICE_ACCOUNT_KEY_PATH") {
+            return .init(pathToServiceAccountKey: path)
+        } else if let jsonString = Environment.get("FCM_SERVICE_ACCOUNT_KEY") {
+            return .init(fromJSON: jsonString)
+        } else { fatalError("FCM envServiceAccountKey not set") }
     }
 
     /// It will try to read
@@ -109,4 +120,11 @@ public struct FCMConfiguration {
         }
         return serviceAccount
     }
+
+    private static func parseServiceAccount(from json: String) -> ServiceAccount {
+        guard let data = json.data(using: .utf8), let serviceAccount = try? JSONDecoder().decode(ServiceAccount.self, from: data) else {
+            fatalError("FCM unable to decode serviceAccount from json string: \(json)")
+        }
+        return serviceAccount
+    }
 }