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/*
* Copyright (c) 2017 Google Inc.
*
* 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.
*/
using Google.Cloud.PubSub.V1;
using Google.Protobuf;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using Pubsub.ViewModels;
using System;
using System.Collections.Generic;
namespace Pubsub.Controllers
{
public class HomeController : Controller
{
readonly PubsubOptions _options;
// Lock protects all the static members.
static object s_lock = new object();
// Keep the received messages in a list.
static List<string> s_receivedMessages = new List<string>();
readonly PublisherClient _publisher;
public HomeController(IOptions<PubsubOptions> options,
PublisherClient publisher)
{
_options = options.Value;
_publisher = publisher;
}
// [START gae_flex_pubsub_index]
[HttpGet]
[HttpPost]
public IActionResult Index(MessageForm messageForm)
{
var model = new MessageList();
if (!_options.HasGoodProjectId())
{
model.MissingProjectId = true;
return View(model);
}
if (!string.IsNullOrEmpty(messageForm.Message))
{
// Publish the message.
var pubsubMessage = new PubsubMessage()
{
Data = ByteString.CopyFromUtf8(messageForm.Message)
};
pubsubMessage.Attributes["token"] = _options.VerificationToken;
_publisher.PublishAsync(pubsubMessage);
model.PublishedMessage = messageForm.Message;
}
// Render the current list of messages.
lock (s_lock) model.Messages = s_receivedMessages.ToArray();
return View(model);
}
// [END gae_flex_pubsub_index]
// [START gae_flex_pubsub_push]
/// <summary>
/// Handle a push request coming from pubsub.
/// </summary>
[HttpPost]
[Route("/Push")]
public IActionResult Push([FromBody]PushBody body,
[FromQuery]string token)
{
string verificationToken =
token ?? body.message.attributes["token"];
if (verificationToken != _options.VerificationToken)
{
return new BadRequestResult();
}
var messageBytes = Convert.FromBase64String(body.message.data);
string message = System.Text.Encoding.UTF8.GetString(messageBytes);
lock (s_lock) s_receivedMessages.Add(message);
return new OkResult();
}
// [END gae_flex_pubsub_push]
public IActionResult Error()
{
return View();
}
}
/// <summary>
/// Pubsub messages will arrive in this format.
/// </summary>
public class PushBody
{
public PushMessage message { get; set; }
public string subscription { get; set; }
}
public class PushMessage
{
public Dictionary<string, string> attributes { get; set; }
public string data { get; set; }
public string message_id { get; set; }
public string publish_time { get; set; }
}
}
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