Mailgun Mailing Lists Subscribing

Mailgun+Lists.swift

//
//  Mailgun+Lists.swift
//  Canteen
//
//  Created by Anthony Castelli on 5/18/17.
//
//

import Foundation
import FormData
import Multipart

extension MailProtocol {
    public func addSubscriber(_ email: String, toList list: String) throws {
        if let mailgun = self as? Mailgun {
            try mailgun.addSubscriber(email, toList: list)
        }
    }
}

extension Mailgun {
    public func addSubscriber(_ email: String, toList list: String) throws {
        let uri = try URI("https://api.mailgun.net/v3/lists/\(list)/members")
        let req = Request(method: .post, uri: uri)
        
        let basic = "api:\(apiKey)".makeBytes().base64Encoded.makeString()
        req.headers["Authorization"] = "Basic \(basic)"
        
        let subscribed = FormData.Field(
            name: "subscribed",
            filename: nil,
            part: Part(
                headers: [:],
                body: "true".makeBytes()
            )
        )
        
        let address = FormData.Field(
            name: "address",
            filename: nil,
            part: Part(
                headers: [:],
                body: email.makeBytes()
            )
        )
        
        
        req.formData = [
            "subscribed": subscribed,
            "address": address
        ]
        
        let client = try clientFactory.makeClient(
            hostname: apiURI.hostname,
            port: apiURI.port ?? 443,
            securityLayer: .tls(EngineClient.defaultTLSContext())
        )
        let res = try client.respond(to: req)
        guard res.status.statusCode < 400 else {
            throw Abort.badRequest
        }
    }
}