Custom service and DirectoryConfig usage example (Vapor 3)

1_EmailSender.swift

import Service
import Foundation
import SwiftSMTP

struct EmailSenderConfig: Service {
    let fromEmail: String
    let fromName: String
    let smtpHostname: String
    let smtpPort: Int
    let smtpEmail: String
    let smtpPassword: String
}

final class EmailSender: ServiceType {
    private let header: String
    private let footer: String
    private let config: EmailSenderConfig

    private init(header: String, footer: String, config: EmailSenderConfig) {
        self.header = header
        self.footer = footer
        self.config = config
    }

    static func makeService(for worker: Container) throws -> EmailSender {
        let directoryConfig = try worker.make(DirectoryConfig.self)
        let header = try String(contentsOfFile: directoryConfig.workDir + "Resources/mail-header.html")
        let footer = try String(contentsOfFile: directoryConfig.workDir + "Resources/mail-footer.html")
        return EmailSender(header: header, footer: footer, config: try worker.make())
    }

    func send(to email: String, name: String, subject: String = "***", content: String) {
        let html = header + content + footer

        let mail = Mail(
            from: Mail.User(name: config.fromName, email: config.fromEmail),
            to: [Mail.User(name: name, email: email)],
            subject: subject,
            text: html)

        SMTP(
            hostname: config.smtpHostname,
            email: config.smtpEmail,
            password: config.smtpPassword,
            port: config.smtpPort,
            tlsMode = .requireTLS   
        ).send(mail)
    }
}

2_configure.swift

// ... imports omitted ...

public func configure(_ config: inout Config, _ env: inout Environment, _ services: inout Services) throws {
    // ... other services omitted to keep the sample short ...

    
    // TODO: you should consider using environment variables instead of hardcoding credentials
    let smtpConfig = EmailSenderConfig(
        fromEmail: "[email protected]",
        fromName: "Foo Bar",
        smtpHostname: "something.something",
        smtpPort: 465,
        smtpEmail: "my",
        smtpPassword: "*******")

    services.register(smtpConfig)
    services.register(EmailSender.self)
}

3_routes.swift

// ... imports omitted ...

/// Register your application's routes here.
public func routes(_ router: Router) throws {
    // ... other routes omitted ...
    
    router.get("email") { req -> String in
        let sender = try req.make(EmailSender.self)
        sender.send(to: "[email protected]", name: "Baz Qux", subject: "Test Email", content: "Hello World!")
        return "OK"
    }
}