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A thundr module for interacting with Mailgun APIs
There is a newer version: 2.0.0
/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://www.3wks.com.au/thundr
 * Copyright (C) 2013 3wks, 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.threewks.thundr.mailgun;

import java.util.Map;

import com.atomicleopard.expressive.Expressive;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.threewks.thundr.http.HttpSupport;
import com.threewks.thundr.http.service.HttpRequest;
import com.threewks.thundr.http.service.HttpResponse;
import com.threewks.thundr.http.service.HttpService;

public class MailgunImpl implements Mailgun {

	private static final String MailgunApiFormat = "https://api.mailgun.net/v2/";

	private HttpService httpService;
	private String domain;
	private String apiUrl;
	private String apiKey;
	private GsonBuilder gsonBuilder;

	public MailgunImpl(HttpService httpService, String mailgunDomain, String mailgunApiKey) {
		this.httpService = httpService;
		this.domain = mailgunDomain;
		this.apiKey = mailgunApiKey;
		this.apiUrl = MailgunApiFormat + mailgunDomain + "/";
		this.gsonBuilder = new GsonBuilder();
	}

	@Override
	public String getDomain() {
		return domain;
	}

	@Override
	public Log log(Integer skip, Integer limit) {
		Map params = Expressive.map();
		if (skip != null) {
			params.put("skip", skip);
		}
		if (limit != null) {
			params.put("limit", limit);
		}

		return getOrPost(Service.Log, Log.class, params, true);
	}

	@Override
	public MessageSend sendEmail(String from, String to, String replyTo, String subject, String htmlBody) {
		Map params = Expressive.map();
		params.put("from", from);
		params.put("to", to);
		if (replyTo != null) {
			params.put("h:Reply-To", replyTo);
		}
		params.put("subject", subject);
		params.put("html", htmlBody);
		return getOrPost(Service.Messages, MessageSend.class, params, false);
	}

	// package protected for stubbing out in tests
	 T getOrPost(Service service, Class type, Map params, boolean getOrPost) {
		String serviceUrl = apiUrl + service.service();
		HttpRequest request = httpService.request(serviceUrl);
		request.parameters(params);
		request.authorize("api", this.apiKey);
		Gson gson = gsonBuilder.create();
		HttpResponse httpResponse = getOrPost ? request.get() : request.post();
		int status = httpResponse.getStatus();
		if (status != 200) {
			throw new MailgunException("Failed to %s %s: response code %d (%s)", getOrPost ? "GET" : "POST", serviceUrl, status, HttpSupport.getReasonForHttpStatus(status));
		}
		String response = httpResponse.getBody();
		T typedResponse = gson.fromJson(response, type);
		return typedResponse;
	}
}