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//
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// GoogleHelpers.cs
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//
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// Author:
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// Paul Schneider <paul@pschneider.fr>
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//
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// Copyright (c) 2015 GNU GPL
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using Newtonsoft.Json;
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using System.Security.Cryptography;
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using System.Security.Cryptography.X509Certificates;
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using System.Text;
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using System.Net;
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using System.Web;
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using System.IO;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using Microsoft.AspNet.Identity;
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namespace Yavsc.Helpers
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{
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using Models.Google.Messaging;
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using Models.Messaging;
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using Models;
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using Interfaces.Workflow;
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using Yavsc.Models.Google;
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using Yavsc.Models.Calendar;
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using Google.Apis.Auth.OAuth2;
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using Google.Apis.Auth.OAuth2.Responses;
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using Microsoft.Data.Entity;
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using Google.Apis.Auth.OAuth2.Flows;
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using Microsoft.AspNet.Identity.EntityFramework;
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/// <summary>
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/// Google helpers.
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/// </summary>
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public static class GoogleHelpers
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{
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public static async Task <MessageWithPayloadResponse> NotifyEvent<Event>
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(this GoogleAuthSettings googleSettings, IEnumerable<string> regids, Event ev)
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where Event : IEvent
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{
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if (ev == null)
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throw new Exception("Spécifier un évènement");
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if (ev.Message == null)
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throw new Exception("Spécifier un message");
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if (ev.Sender == null)
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throw new Exception("Spécifier un expéditeur");
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if (regids == null)
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throw new NotImplementedException("Notify & No GCM reg ids");
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var msg = new MessageWithPayload<Event>()
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{
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notification = new Notification()
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{
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title = ev.Topic+" "+ev.Sender,
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body = ev.Message,
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icon = "icon"
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},
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data = ev,
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registration_ids = regids.ToArray()
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};
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try {
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using (var m = new SimpleJsonPostMethod("https://gcm-http.googleapis.com/gcm/send",$"key={googleSettings.ApiKey}")) {
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return await m.Invoke<MessageWithPayloadResponse>(msg);
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}
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}
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catch (Exception ex) {
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throw new Exception ("Quelque chose s'est mal passé à l'envoi",ex);
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}
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}
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public static ServiceAccountCredential GetCredentialForApi(IEnumerable<string> scopes)
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{
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var initializer = new ServiceAccountCredential.Initializer(Startup.GoogleSettings.Account.client_email);
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initializer = initializer.FromPrivateKey(Startup.GoogleSettings.Account.private_key);
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initializer.Scopes = scopes;
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var credential = new ServiceAccountCredential(initializer);
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return credential;
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}
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public static async Task<IdentityUserLogin<string>> GetGoogleUserLoginAsync(
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this UserManager<ApplicationUser> userManager,
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ApplicationDbContext context,
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string yavscUserId)
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{
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var user = await userManager.FindByIdAsync(yavscUserId);
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var googleLogin = await context.UserLogins.FirstOrDefaultAsync(
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x => x.UserId == yavscUserId && x.LoginProvider == "Google"
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);
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return googleLogin;
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}
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public static UserCredential GetGoogleCredential(IdentityUserLogin<string> googleUserLogin)
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{
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var googleId = googleUserLogin.ProviderKey;
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if (string.IsNullOrEmpty(googleId))
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throw new InvalidOperationException("No Google login");
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TokenResponse resp = null;
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var flow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer());
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return new UserCredential(flow, googleId, resp);
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}
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static string evStatusDispo = "Dispo";
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public static async Task<Period[]> GetFreeTime (this ICalendarManager manager, string calId, DateTime startDate, DateTime endDate)
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{
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CalendarEventList evlist = await manager.GetCalendarAsync(calId, startDate, endDate) ;
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var result = evlist.items
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.Where(
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ev => ev.status == evStatusDispo
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)
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.Select(
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ev => new Period {
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Start = ev.start.datetime,
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End = ev.end.datetime
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}
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);
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return result.ToArray();
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}
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const string jwtHeader="{\"alg\":\"RS256\",\"typ\":\"JWT\"}";
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const string tokenEndPoint = "https://www.googleapis.com/oauth2/v4/token";
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static long GetTimeSpan(long seconds) {
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var zero = new DateTime(1970,1,1);
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return zero.AddSeconds(seconds).ToFileTimeUtc();
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}
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static object CreateGoogleServiceClaimSet(string scope, int expiresInSeconds) {
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return new {
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iss = Startup.GoogleSettings.Account.client_email,
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scope = scope,
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aud = "https://www.googleapis.com/oauth2/v4/token",
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exp = GetTimeSpan(expiresInSeconds),
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iat = DateTime.Now.ToFileTimeUtc()
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};
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}
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public static async Task<string> GetJsonTokenAsync(string scope)
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{
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var claimSet = CreateGoogleServiceClaimSet(scope, 3600);
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string jsonClaims = JsonConvert.SerializeObject(claimSet);
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string encClaims = Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(jsonClaims));
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string tokenHeader = Convert.ToBase64String(Encoding.UTF8.GetBytes(jwtHeader))+"."+encClaims;
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X509Certificate2 cert = new X509Certificate2();
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cert.Import(Convert.FromBase64String(Startup.GoogleSettings.Account.private_key));
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RSACryptoServiceProvider key = new RSACryptoServiceProvider();
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key.FromXmlString(cert.PrivateKey.ToXmlString(true));
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byte[] sig = key.SignData(Encoding.UTF8.GetBytes(tokenHeader), CryptoConfig.MapNameToOID("SHA256"));
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string assertion = tokenHeader+"."+Convert.ToBase64String(sig);
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HttpWebRequest webreq = WebRequest.CreateHttp ("https://www.googleapis.com/oauth2/v4/token");
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webreq.ContentType = "application/x-www-form-urlencoded";
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using (var inputstream = await webreq.GetRequestStreamAsync()) {
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var content = Encoding.UTF8.GetBytes( "grant_type="+ HttpUtility.UrlEncode(" urn:ietf:params:oauth:grant-type:jwt-bearer")+
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"&assertion="+HttpUtility.UrlEncode(assertion));
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await inputstream.WriteAsync(content,0,content.Length);
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}
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using (WebResponse resp = await webreq.GetResponseAsync ()) {
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using (Stream respstream = resp.GetResponseStream ()) {
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using (var rdr = new StreamReader(respstream)) {
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return await rdr.ReadToEndAsync();
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}
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}
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}
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}
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}
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}
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