com.github.jurajburian.mailer.SessionFactory.scala Maven / Gradle / Ivy

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Thin wrapper of JavaMail library written in Scala language. Mailer is aim to be used in situations when is necessary send multiple mails, e.t. instance of javax.mail.Session is created and used by Mailer.

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package com.github.jurajburian.mailer

import java.util.Properties
import jakarta.mail.{PasswordAuthentication, Authenticator, Session}

import scala.annotation.tailrec


/**
	* Represents the factory, used to create ''JavaMail'' session with selected properties.
	*
	* @author jubu
	*/
trait SessionFactory {
	/**
		* Adds the given ''JavaMail'' property to the set of existing properties.
		*
		* @param p property to add
		* @return instance of [[com.github.jurajburian.mailer.SessionFactory]] itself
		*/
	def append(p: Prop): SessionFactory

	/**
		* Adds the given ''JavaMail'' property to the set of existing properties (used usually as the
		* prepend operator).
		*
		* @param p property to add
		* @return instance of [[com.github.jurajburian.mailer.SessionFactory]] itself
		*/
	def ::(p: Prop): SessionFactory = append(p)

	/**
		* Adds the given ''JavaMail'' property to the set of existing properties (used usually as the
		* append operator).
		*
		* @param p property to add
		* @return instance of [[com.github.jurajburian.mailer.SessionFactory]] itself
		*/
	def +(p: Prop): SessionFactory = ::(p)

	/**
		* Returns the created ''JavaMail'' session, optionally credentials can be provided if required.
		*
		* @param credentials credentials, represented as the pair of (username, password), optional
		* @return Plain mail Session
		*/
	def session(credentials: Option[(String, String)] = None): Session
}

/**
	* Provides set of operations needed to create [[com.github.jurajburian.mailer.SessionFactory]] instance.
	*/
object SessionFactory {
	def apply() = new SessionFactory {
		override def append(p: Prop): SessionFactory = {
			@tailrec
			def walk(p: impl, properties: Properties = new Properties()): Properties = {
				p.prop.convert.map { p => properties.setProperty(p._1, p._2.toString) }
				if (p.prev == null) {
					properties
				} else {
					walk(p.prev, properties)
				}
			}
			case class impl(prev: impl, prop: Prop) extends SessionFactory {
				override def append(p: Prop): SessionFactory = new impl(this, p)

				def properties(): Properties = {
					walk(this)
				}

				override def session(credentials: Option[(String, String)] = None): Session = {
					val ps = properties()
					credentials match {
						case None => {
							Session.getInstance(ps)
						}
						case Some((u, pass)) => {
							ps.put("mail.smtp.auth", true.toString)
							Session.getInstance(ps, new Authenticator {
								protected override def getPasswordAuthentication() = new PasswordAuthentication(u, pass)
							})
						}
					}
				}
			}
			impl(null, p)
		}

		override def session(credentials: Option[(String, String)] = None): Session = {
			throw new NotImplementedError()
		}
	}
}