Akses Layanan Mail menggunakan OAuth
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dukungan OAuth 2.0 telah ditambahkan ke Aspose.Email dan dapat digunakan untuk mengakses server SMTP, POP3, IMAP, dan EWS. Secara umum, semua server yang mendukung token bearer OAuth 2.0 dapat digunakan dengan Aspose.Email, namun klien email kami telah diuji dengan server mail Google dan server Microsoft Office 365. Akses ke server dari SmtpClient, Pop3Client, ImapClient dan EWSClient dengan OAuth dapat diimplementasikan dalam 2 cara.
- Berikan token akses langsung ke dalam konstruktor klien email. Dalam kasus ini, pengguna harus memahami bahwa masa berlaku token akses terbatas. Ketika token kedaluwarsa, klien email tidak dapat digunakan untuk mengakses server.
- Berikan implementasi khusus penyedia token berdasarkan ITokenProvider antarmuka ke dalam konstruktor klien email. Dalam kasus ini, klien memeriksa waktu kedaluwarsa token dan meminta ITokenProvider untuk token akses baru ketika token sebelumnya kedaluwarsa. Dengan cara ini, klien memperbarui token secara berkala dan dapat berfungsi dengan server tanpa batas waktu. Seringkali layanan mendukung cara sederhana untuk memperbarui token akses. Misalnya, menggunakan token penyegaran dalam layanan Google atau alur otentikasi ROPC pada platform identitas Microsoft dapat digunakan untuk implementasi penyedia token.
Konfigurasikan Akun pada Server yang Tepat
Artikel berikut membantu Anda mengkonfigurasi akun untuk mengakses layanan mail.
- Untuk Office 365
- Untuk Gmail
Akses Layanan Mail dengan Token Akses
Contoh kode berikut menunjukkan cara terhubung ke layanan mail menggunakan token akses.
// Connecting to SMTP server
using (SmtpClient client = new SmtpClient(
"smtp.gmail.com",
587,
"user1@gmail.com",
"accessToken",
true,
SecurityOptions.SSLExplicit))
{
}
// Connecting to IMAP server
using (ImapClient client = new ImapClient(
"imap.gmail.com",
993,
"user1@gmail.com",
"accessToken",
true,
SecurityOptions.SSLImplicit))
{
}
// Connecting to POP3 server
using (Pop3Client client = new Pop3Client(
"pop.gmail.com",
995,
"user1@gmail.com",
"accessToken",
true,
SecurityOptions.Auto))
{
}
Akses Layanan Mail dengan Penyedia Token
Contoh kode berikut menunjukkan cara terhubung ke layanan mail menggunakan penyedia token.
ITokenProvider tokenProvider = TokenProvider.Google.GetInstance(
"ClientId",
"ClientSecret",
"RefreshToken");
// Connecting to SMTP server
using (SmtpClient client = new SmtpClient(
"smtp.gmail.com",
587,
"user1@gmail.com",
tokenProvider,
SecurityOptions.SSLExplicit))
{
}
// Connecting to IMAP server
using (ImapClient client = new ImapClient(
"imap.gmail.com",
993,
"user1@gmail.com",
tokenProvider,
SecurityOptions.SSLImplicit))
{
}
// Connecting to POP3 server
using (Pop3Client client = new Pop3Client(
"pop.gmail.com",
995,
"user1@gmail.com",
tokenProvider,
SecurityOptions.Auto))
{
}
Implementasi Custom ITokenProvider untuk Office 365
Anda dapat menggunakan implementasi penyedia token di bawah ini untuk mengakses layanan mail Office 365.
using JsonConvert = Newtonsoft.Json.JsonConvert;
using Aspose.Email.Clients;
using Aspose.Email.Common.Utils;
using Aspose.Email.Tests.TestUtils;
using Newtonsoft.Json;
using System;
using System.IO;
using System.Net;
using System.Text;
namespace TestNS
{
/// <summary>
/// Azure resource owner password credential (ROPC) token provider
/// https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth-ropc
/// https://portal.azure.com
/// https://developer.microsoft.com/en-us/graph/graph-explorer/#
/// token parser https://jwt.io
/// </summary>
internal class AzureROPCTokenProvider : ITokenProvider
{
private const string uriFormat = "https://login.microsoftonline.com/{0}/oauth2/v2.0/token";
private const string bodyFormat =
"client_id={0}" +
"&scope={1}" +
"&username={2}" +
"&password={3}" +
"&grant_type={4}";
private readonly string scope;
private const string grant_type = "password";
private readonly object tokenSyncObj = new object();
private OAuthToken token;
private readonly string tenant;
private readonly string clientId;
private readonly string clientSecret;
private readonly string userName;
private readonly string password;
/// <summary>
/// Initializes a new instance of the <see cref="AzureROPCTokenProvider"/> class
/// </summary>
/// <param name="tenant"></param>
/// <param name="clientId"></param>
/// <param name="clientSecret"></param>
/// <param name="scope"></param>
/// <param name="userName"></param>
/// <param name="password"></param>
/// <param name="scopeAr"></param>
public AzureROPCTokenProvider(
string tenant,
string clientId,
string clientSecret,
string userName,
string password,
string[] scopeAr)
{
this.tenant = tenant;
this.clientId = clientId;
this.clientSecret = clientSecret;
this.userName = userName;
this.password = password;
this.scope = string.Join(" ", scopeAr);
}
/// <summary>
/// Gets oAuth access token.
/// </summary>
/// <param name="ignoreExistingToken">
/// If ignoreExistingToken is true, requests new token from a server. Otherwise behaviour is depended on whether token exists or not.
/// If token exists and its expiration date is not expired returns current token, otherwise requests new token from a server.
/// </param>
/// <returns>Returns oAuth access token</returns>
public virtual OAuthToken GetAccessToken(bool ignoreExistingToken)
{
lock (tokenSyncObj)
{
if (this.token != null && !this.token.Expired && !ignoreExistingToken)
return this.token;
token = null;
string uri = string.Format(uriFormat, string.IsNullOrWhiteSpace(tenant) ? "common" : tenant);
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
string body = string.Format(bodyFormat,
HttpUtility.UrlEncode(clientId),
HttpUtility.UrlEncode(scope),
HttpUtility.UrlEncode(userName),
HttpUtility.UrlEncode(password),
HttpUtility.UrlEncode(grant_type));
byte[] bytes = Encoding.ASCII.GetBytes(body);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = bytes.Length;
MemoryStream ms = new MemoryStream(bytes);
using (Stream requestStream = request.GetRequestStream())
requestStream.Write(bytes, 0, bytes.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StringBuilder responseText = new StringBuilder();
bytes = new byte[1024];
int read = 0;
using (Stream stream = response.GetResponseStream())
{
while ((read = stream.Read(bytes, 0, bytes.Length)) > 0)
responseText.Append(Encoding.ASCII.GetString(bytes, 0, read));
}
string jsonString = responseText.ToString();
AzureTokenResponse t = JsonConvert.DeserializeObject<AzureTokenResponse>(jsonString);
token = new OAuthToken(
t.access_token,
TokenType.AccessToken,
DateTime.Now.AddSeconds(t.expires_in));
return token;
}
}
/// <summary>
/// Gets oAuth access token.
/// If token exists and its expiration date is not expired returns current token, otherwise requests new token from a server.
/// </summary>
/// <returns>Returns oAuth access token</returns>
public OAuthToken GetAccessToken()
{
return GetAccessToken(false);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public virtual void Dispose()
{
}
}
/// <summary>
/// A success response contains a JSON OAuth 2.0 response with the following parameters.
/// </summary>
public class AzureTokenResponse
{
/// <summary>
/// The requested access token. The calling web service can use this token to authenticate to the receiving web service.
/// </summary>
public string access_token { get; set; }
/// <summary>
/// Indicates the token type value. The only type that Azure AD supports is Bearer For more information about bearer tokens,
/// see The OAuth 2.0 Authorization Framework: Bearer Token Usage (RFC 6750).
/// </summary>
public string token_type { get; set; }
/// <summary>
/// How long the access token is valid (in seconds).
/// </summary>
public int expires_in { get; set; }
/// <summary>
/// How long the access token is valid (in seconds).
/// </summary>
public int ext_expires_in { get; set; }
/// <summary>
/// The time when the access token expires.
/// The date is represented as the number of seconds from 1970-01-01T00:00:00Z UTC until the expiration time.
/// This value is used to determine the lifetime of cached tokens.
/// </summary>
public int expires_on { get; set; }
/// <summary>
/// The App ID URI of the receiving web service.
/// </summary>
public string resource { get; set; }
/// <summary>
/// If an access token was returned, this parameter lists the scopes the access token is valid for.
/// </summary>
public string scope { get; set; }
/// <summary>
/// Issued if the original scope parameter included the openid scope.
/// </summary>
public string id_token { get; set; }
/// <summary>
/// Issued if the original scope parameter included offline_access.
/// </summary>
public string refresh_token { get; set; }
}
}
Contoh kode berikut menunjukkan cara terhubung ke layanan Office 365 menggunakan penyedia token khusus.
ITokenProvider tokenProvider = new AzureROPCTokenProvider(
"Tenant",
"ClientId",
"ClientSecret",
"EMail",
"Password",
scopes);
// Connecting to SMTP server
using (SmtpClient client = new SmtpClient(
"smtp.office365.com",
587,
"Test1@test.onmicrosoft.com",
tokenProvider,
SecurityOptions.SSLExplicit))
{
}
// Connecting to IMAP server
using (ImapClient client = new ImapClient(
"outlook.office365.com",
993,
"Test1@test.onmicrosoft.com",
tokenProvider,
SecurityOptions.SSLImplicit))
{
}
// Connecting to POP3 server
using (Pop3Client client = new Pop3Client(
"outlook.office365.com",
995,
"Test1@test.onmicrosoft.com",
tokenProvider,
SecurityOptions.Auto))
{
}
// Connecting to EWS server
const string mailboxUri = "https://outlook.office365.com/ews/exchange.asmx";
ICredentials credentials = new OAuthNetworkCredential(tokenProvider);
using (IEWSClient ewsClient = EWSClient.GetEWSClient(mailboxUri, credentials))
{
}