Add email sending functionality and configuration

Sources/App/Management/Configuration.swift

@@ -3,6 +3,26 @@ import Foundation
 struct Configuration {
 
     let serverPort: Int
+
+    let mail: EMail
+
+    struct EMail {
+
+        /// The url to the root of the server
+        let serverDomain: String
+
+        /// SMTP server address
+        let emailHostname: String
+
+        /// username to login
+        let email: String
+
+        /// password to login
+        let password: String
+
+        /// The number of minutes until a password reset token is no longer valid
+        let tokenExpiryDuration: Int
+    }
 }
 
 extension Configuration {
@@ -27,6 +47,11 @@ extension Configuration {
         }
     }
 }
+
+extension Configuration.EMail: Codable {
+    
+}
+
 extension Configuration: Codable {
 
 }

Sources/App/Management/SQLiteDatabase.swift

@@ -1,6 +1,7 @@
 import Foundation
 import Fluent
 import Vapor
+import SwiftSMTP
 
 typealias PasswordHash = String
 typealias SessionToken = String
@@ -15,8 +16,20 @@ final class SQLiteDatabase {
 
     private let tables: TableManagement
 
-    init(db: Database) throws {
+    private let mailConfiguration: Configuration.EMail
+
+    private let smtp: SMTP
+
+    private let mailSender: Mail.User
+
+    init(db: Database, mail: Configuration.EMail) throws {
         self.tables = try TableManagement(db: db)
+        self.smtp = SMTP(
+            hostname: mail.emailHostname,
+            email: mail.email,
+            password: mail.password)
+        self.mailSender = Mail.User(name: "Schafkopf Server", email: mail.email)
+        self.mailConfiguration = mail
     }
 
     func registerPlayer(named name: PlayerName, hash: PasswordHash, in database: Database) -> EventLoopFuture<SessionToken> {
@@ -33,6 +46,37 @@ final class SQLiteDatabase {
             }
     }
 
+    private func sendEmail(name: PlayerName, email: String, token: String) {
+        let recipient = Mail.User(name: name, email: email)
+        let url = "\(mailConfiguration.serverDomain)/player/reset?token=\(token)"
+        let mail = Mail(
+            from: mailSender,
+            to: [recipient],
+            subject: "Schafkopf Server Password Reset",
+            text:
+                    """
+                    Hello \(name),
+
+                    a reset of your account password has been requested for the Schafkopf Server at \(mailConfiguration.serverDomain).
+                    To choose a new password, click the following link:
+
+                    <a href="\(url)">\(url)</a>
+
+                    The link will expire in \(mailConfiguration.tokenExpiryDuration) minutes. If you didn't request the password reset, you don't have to do anything.
+
+                    Regards,
+
+                    The Schafkopf Server Team
+                    """
+        )
+
+        self.smtp.send(mail) { (error) in
+            if let error = error {
+                print("Failed to send recovery email to \(email): \(error)")
+            }
+        }
+    }
+
     func passwordHashForExistingPlayer(named name: PlayerName, in database: Database) -> EventLoopFuture<PasswordHash> {
         User.query(on: database).filter(\.$name == name).first()
             .unwrap(or: Abort(.forbidden)).map { $0.passwordHash }

Sources/App/configure.swift

@@ -36,7 +36,7 @@ public func configure(_ app: Application) throws {
     app.middleware.use(FileMiddleware(publicDirectory: app.directory.publicDirectory))
 
     let db = app.databases.database(.sqlite, logger: .init(label: "Init"), on: app.databases.eventLoopGroup.next())!
-    server = try SQLiteDatabase(db: db)
+    server = try SQLiteDatabase(db: db, mail: configuration.mail)
     
     // Gracefully shut down by closing potentially open socket
     DispatchQueue.global(qos: .utility).asyncAfter(deadline: .now() + .seconds(5)) {