You can retrieve email using traditional user/password IMAP4 authentication from personal Hotmail/Outlook account.
However, Microsoft will disable traditional user authentication in the future, switching to Microsoft OAuth (Modern Authentication) is strongly recommended now.
Sections:
Before you can use the following sample codes, you should download the EAGetMail Installer and install it on your machine at first. Full sample projects are included in this installer.
To better demonstrate how to retrieve email and parse email, let’s create a Visual C++ console project named “receiveemail” at first, and then add the reference of EAGetMail in your project.
To use EAGetMail POP3 & IMAP4 ActiveX Object in your project, the first step is “Add header files of EAGetMail to your project”.
Please go to C:\Program Files\EAGetMail\Include\tlh
or C:\Program Files (x86)\EAGetMail\Include\tlh
folder, find eagetmailobj.tlh
and eagetmailobj.tli
,
and then copy these files to your project folder. You can start to use it to retrieve email and parse email in your project.
To use Microsoft/Office365/Live OAuth (Modern Authentication) in your application, you must create a application in Azure Portal.
Azure portal
using either a work or school account or a personal Microsoft account.Azure AD tenant
that you want.Search Microsoft Entra ID
(old name “Azure Active Directory”) and go to this service:
In the left-hand navigation pane, select the Microsoft Entra ID
service, and then select App registrations -> New registration.
Input a name to to register the application:
When the register an application page appears, enter a meaningful application name and select the account type.
Select which accounts you would like your application to support.
Single tenant
type;Multitenant
type, and you must verify publisher.Because we want to support all Office 365 and
LIVE SDK (hotmail, outlook personal account), so select
Accounts in any organizational directory and personal Microsoft accounts
.
Important
If you don’t verify publisher for multitenant application, your application will not request access token successfully.
Now you need to assign API permission to the application by clicking API Permission
-> Add a permission
.
You don’t have to assign all the API permissions below to the application, just assign the API permission(s) you need.
Protocol | Permission | Scope | |
Graph API | Mail.Send, Mail.ReadWrite | https://graph.microsoft.com/Mail.Send, https://graph.microsoft.com/Mail.ReadWrite | |
EWS | EWS.AccessAsUser.All | https://outlook.office.com/EWS.AccessAsUser.All | |
SMTP | SMTP.Send | https://outlook.office365.com/SMTP.Send | |
POP | POP.AccessAsUser.All | https://outlook.office365.com/POP.AccessAsUser.All | |
IMAP | IMAP.AccessAsUser.All | https://outlook.office365.com/IMAP.AccessAsUser.All |
Now we need to add permission to the application:
API Permission
->Add a permission
->
Microsoft Graph
-> Delegated Permission
-> User.Read
,
email
, offline_access
, openid
, profile
, SMTP.Send
,
IMAP.AccessAsUser.All
, POP.AccessAsUser.All
, Mail.Send
, Mail.ReadWrite
.With the above permissions, your application can support SMTP, POP and IMAP service. If your application needs to support EWS protocol either, add EWS permission like this:
API Permission
->Add a permission
-> APIs in my organization uses
-> Office 365 Exchange Online
-> Delegated Permission
->
Check EWS.AccessAsUser.All
Here is permissions list:
Because the example code is based on desktop application, so add Redirect Uri
like this:
Click "Authentication"
-> Add a platform
-> Mobile and desktop applications
-> Redirect Uri
, please check or add the following URI.
https://login.microsoftonline.com/common/oauth2/nativeclient
https://login.microsoftonline.com/common/oauth2/nativeclient
http://127.0.0.1
Note
https://login.microsoftonline.com/common/oauth2/nativeclient
is used for Live SDK, http://127.0.0.1
is used for local Http Listener.If your application needs to support Microsoft personal account, set both "Live SDK Support"
and "Treat application as a public client"
to "Yes"
.
Now we need to create a client secret for the application,
click Certificates and secrets
-> client secrets
and add a new client secret
.
After client secret is created, store the client secret value to somewhere.
Important
Please store client secret value
by yourself, because it is hidden when you view it at next time.
Now we click Branding
, you can edit your company logo
, URL
and application name
. If your application supports
multitenant (access user in all Office 365 and Microsoft personal account), you must complete the publisher verification
.
It is not difficult, you can have a look at publisher verification. After publisher verification is completed, your branding is like this:
Important
You must complete the publisher verification for multitenant application, otherwise, your application will not request access token correctly.
Now you can click Overview
to find your client id
and tenant
.
single tenant
, use the tenant value in tokenUri
and authUri
instead of common
.multitenant
, use common
as tenant.Above client id
and client secret
support both "Office365 + SMTP/POP/IMAP/EWS"
and
"Live (hotmail, outlook personal account) + SMTP/POP/IMAP"
,
Because HttpWebRequest is used to get access token from web service.
If you’re using legacy .NET framework (.NET 2.0 - .NET 3.5 and .NET 4.0 - 4.6.1),
you need to enable Strong Encryption Algorithms
to request access token:
Put the following content to a file named NetStrongEncrypt.reg
, right-click this file -> Merge
-> Yes
.
You can also download it from https://www.emailarchitect.net/webapp/download/NetStrongEncrypt.zip.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v2.0.50727]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SystemDefaultTlsVersions"=dword:00000001
"SchUseStrongCrypto"=dword:00000001
You can use client id and client secret to get the user email address and access token like this:
EAGetMail Installation Path\Samples_{Programming language/Developer Tool}
project.You don’t have to open browser to request access token
every time. By default,
access token
expiration time is 3600 seconds, you can use the access token
repeatedly before it is expired.
After it is expired, you can use refresh token
to refresh access token
directly without opening browser.
You can find full sample project in EAGetMail installation path
to learn how to refresh token
.
Important
You should create your client id
and client secret
, do not use the client id
from example codes in production environment,
it is used for test purpose. If you got "This app isn't verified"
information, please click "Advanced"
-> Go to ...
for test.
Here is a console application which demonstrates how to use Microsoft OAuth to do user authentication and retrieve email using IMAP4 protocol.
Note
This sample cannot handle the event of Web Browser is closed by user manually before authentication is completed.
You can refer to the better sample project which uses Web Browser Control
in EAGetMail installation path.
#include "stdafx.h" // pre-compile header
#include <stdio.h>
#include <tchar.h>
#include "C:\Program Files (x86)\EAGetMail\Include\tlh\EAGetMailObj.tlh"
using namespace EAGetMailObjLib;
#include "C:\Program Files (x86)\EAGetMail\Include\tlh\msxml3.tlh"
using namespace MSXML2;
const int MailServerPop3 = 0;
const int MailServerImap4 = 1;
const int MailServerEWS = 2;
const int MailServerDAV = 3;
const int MailServerMsGraph = 4;
const int MailServerAuthLogin = 0;
const int MailServerAuthCRAM5 = 1;
const int MailServerAuthNTLM = 2;
const int MailServerAuthXOAUTH2 = 3;
const int GetMailInfos_All = 1;
const int GetMailInfos_NewOnly = 2;
const int GetMailInfos_ReadOnly = 4;
const int GetMailInfos_SeqRange = 8;
const int GetMailInfos_UIDRange = 16;
const int GetMailInfos_PR_ENTRYID = 32;
const int GetMailInfos_DateRange = 64;
const int GetMailInfos_OrderByDateTime = 128;
DWORD _getCurrentPath(LPTSTR lpPath, DWORD nSize)
{
DWORD dwSize = ::GetModuleFileName(NULL, lpPath, nSize);
if (dwSize == 0 || dwSize == nSize)
{
return 0;
}
// Change file name to current full path
LPCTSTR psz = _tcsrchr(lpPath, _T('\\'));
if (psz != NULL)
{
lpPath[psz - lpPath] = _T('\0');
return _tcslen(lpPath);
}
return 0;
}
void RetrieveWithXOAUTH2(const char* lpszEmail, const char* lpszAccessToken)
{
try
{
TCHAR szPath[MAX_PATH + 1];
_getCurrentPath(szPath, MAX_PATH);
TCHAR szMailBox[MAX_PATH + 1];
wsprintf(szMailBox, _T("%s\\inbox"), szPath);
// Create a folder to store emails
::CreateDirectory(szMailBox, NULL);
IMailServerPtr oServer = NULL;
oServer.CreateInstance(__uuidof(EAGetMailObjLib::MailServer));
// Hotmail/Outlook/Live IMAP server address
oServer->Server = _bstr_t("outlook.office365.com");
oServer->User = _bstr_t(lpszEmail);
// Use access token as password
oServer->Password = _bstr_t(lpszAccessToken);
// Use OAUTH 2.0
oServer->AuthType = MailServerAuthXOAUTH2;
// Use IMAP4 Protocol
oServer->Protocol = MailServerImap4;
// Enable SSL Connection
oServer->SSLConnection = VARIANT_TRUE;
// Set IMAP4 SSL Port
oServer->Port = 993;
IMailClientPtr oClient = NULL;
oClient.CreateInstance(__uuidof(EAGetMailObjLib::MailClient));
oClient->LicenseCode = _T("TryIt");
_tprintf(_T("Connecting %s ...\r\n"), (const TCHAR*)oServer->Server);
oClient->Connect(oServer);
// Get new email only, if you want to get all emails, please remove this line
oClient->GetMailInfosParam->GetMailInfosOptions = GetMailInfos_NewOnly;
IMailInfoCollectionPtr infos = oClient->GetMailInfoList();
_tprintf(_T("Total %d emails\r\n"), infos->Count);
for (long i = 0; i < infos->Count; i++)
{
IMailInfoPtr pInfo = infos->GetItem(i);
_tprintf(_T("Index: %d; Size: %d; UIDL: %s\r\n\r\n"),
pInfo->Index, pInfo->Size, (const TCHAR*)pInfo->UIDL);
TCHAR szFile[MAX_PATH + 1];
// Generate a random file name by current local datetime,
// You can use your method to generate the filename if you do not like it
SYSTEMTIME curtm;
::GetLocalTime(&curtm);
::wsprintf(szFile, _T("%s\\%04d%02d%02d%02d%02d%02d%03d%d.eml"),
szMailBox,
curtm.wYear,
curtm.wMonth,
curtm.wDay,
curtm.wHour,
curtm.wMinute,
curtm.wSecond,
curtm.wMilliseconds,
i);
// Receive email from POP3 server
IMailPtr oMail = oClient->GetMail(pInfo);
_tprintf(_T("From: %s\r\n"), (const TCHAR*)oMail->From->Address);
_tprintf(_T("Subject: %s\r\n"), (const TCHAR*)oMail->Subject);
// Save email to local disk
oMail->SaveAs(szFile, VARIANT_TRUE);
// Mark email as read to prevent retrieving this email again.
oClient->MarkAsRead(pInfo, VARIANT_TRUE);
// If you want to delete current email, please use Delete method instead of MarkAsRead
// oClient->Delete(pInfo);
}
// Delete method just mark the email as deleted,
// Quit method expunge the emails from server exactly.
oClient->Quit();
}
catch (_com_error &ep)
{
_tprintf(_T("Error: %s"), (const TCHAR*)ep.Description());
}
}
// client configuration
// You should create your client id and client secret,
// do not use the following client id in production environment, it is used for test purpose only.
const char* clientID = "eccbabb2-3377-4265-85c1-ea2fb515f075";
const char* clientSecret = "QaR_RR:-5WqTY[nni9pdBr9xVybqrAu4";
const char* scope = "https://outlook.office.com/IMAP.AccessAsUser.All%20https://outlook.office.com/POP.AccessAsUser.All%20offline_access%20email%20openid";
const char* authUri = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize";
const char* tokenUri = "https://login.microsoftonline.com/common/oauth2/v2.0/token";
// path?parameter1=value1¶meter2=value2#anchor;
_bstr_t ParseParameter(const char* uri, const char* key)
{
_bstr_t value = "";
if (uri == NULL || key == NULL)
return value;
const char* p = strchr(uri, '?');
p = (p != NULL) ? p + 1 : uri;
do
{
if (_strnicmp(p, key, strlen(key)) == 0)
{
p += strlen(key);
const char* pend = strpbrk(p, "&#");
if (pend != NULL)
{
char* buf = new char[pend - p + 1];
memcpy(buf, p, pend - p);
buf[pend - p] = '\0';
value = buf;
delete[] buf;
}
else
{
value = p;
}
return value;
}
p = strchr(p, '&');
if (p) p++;
} while (p);
return value;
}
_bstr_t RequestAccessToken(const char* code, const char* redirectUri)
{
printf("Exchanging code for tokens...\n");
_bstr_t responseText = "";
try
{
IServerXMLHTTPRequestPtr httpRequest = NULL;
httpRequest.CreateInstance(__uuidof(MSXML2::ServerXMLHTTP));
if (httpRequest == NULL)
{
printf("Failed to create XML HTTP Object, please make sure you install MSXML 3.0 on your machine.\n");
return responseText;
}
_bstr_t tokenRequestBody = "code=";
tokenRequestBody += code;
tokenRequestBody += "&redirect_uri=";
tokenRequestBody += redirectUri;
tokenRequestBody += "&client_id=";
tokenRequestBody += clientID;
tokenRequestBody += "&grant_type=authorization_code";
const char* postData = (const char*)tokenRequestBody;
long cdata = (long)strlen(postData);
LPSAFEARRAY psaHunk = ::SafeArrayCreateVectorEx(VT_UI1, 0, cdata, NULL);
for (long k = 0; k < cdata; k++)
{
BYTE ch = (BYTE)postData[k];
::SafeArrayPutElement(psaHunk, &k, &ch);
}
_variant_t requestBuffer;
requestBuffer.vt = (VT_ARRAY | VT_UI1);
requestBuffer.parray = psaHunk;
_variant_t async(true);
httpRequest->setOption((MSXML2::SERVERXMLHTTP_OPTION)2, 13056);
httpRequest->open(L"POST", _bstr_t(tokenUri), async, vtMissing, vtMissing);
httpRequest->setRequestHeader(L"Content-Type", L"application/x-www-form-urlencoded");
httpRequest->send(requestBuffer);
while (httpRequest->readyState != 4) {
httpRequest->waitForResponse(1);
}
long status = httpRequest->status;
responseText = httpRequest->responseText;
if (status < 200 || status >= 300)
{
printf("Failed to get access token from server: %d %s\n", status, (const char*)responseText);
}
return responseText;
}
catch (_com_error &ep)
{
printf("Failed to get access token: %s\n", (const char*)ep.Description());
}
return responseText;
}
void DoOauthAndRetrieveEmail()
{
IHttpListenerPtr httpListener = NULL;
httpListener.CreateInstance(__uuidof(EAGetMailObjLib::HttpListener));
// Creates a redirect URI using an available port on the loopback address.
if (httpListener->Create("127.0.0.1", 0) == VARIANT_FALSE)
{
printf("Failed to listen on %s\n", (const char*)httpListener->GetLastError());
return;
}
char szUri[MAX_PATH + 1];
sprintf_s(szUri, MAX_PATH, "http://127.0.0.1:%d", httpListener->ListenPort);
printf("listen on %s ...\n", szUri);
// Creates the OAuth 2.0 authorization request.
_bstr_t authorizationRequest = authUri;
authorizationRequest += "?response_type=code&scope=";
authorizationRequest += scope;
authorizationRequest += "&redirect_uri=";
authorizationRequest += szUri;
authorizationRequest += "&client_id=";
authorizationRequest += clientID;
authorizationRequest += "&prompt=login";
printf("open %s ...\n", (const char*)authorizationRequest);
// Opens request in the browser.
IBrowserUiPtr browserUi = NULL;
browserUi.CreateInstance(__uuidof(EAGetMailObjLib::BrowserUi));
browserUi->OpenUrl(authorizationRequest);
// Waits for the OAuth authorization response.
if (httpListener->GetRequestUrl(-1) == VARIANT_FALSE)
{
printf("Failed to get authorization response %s\n", (const char*)httpListener->GetLastError());
return;
}
// Brings the Console to Focus.
SetForegroundWindow(GetConsoleWindow());
// Send response and stop http listener.
httpListener->SendResponse(_bstr_t("200"),
_bstr_t("text/html; charset=utf-8"),
"<html><head></head><body>Please return to the app and close current window.</body></html>");
httpListener->Close();
_bstr_t requestUri = httpListener->RequestUrl;
printf("RequestUri: %s\n", (const char*)requestUri);
// Checks for errors.
_bstr_t error = ParseParameter((const char*)requestUri, "error=");
if (error.length())
{
printf("OAuth authorization error: %s\n", (const char*)error);
return;
}
// Check authorization code
_bstr_t code = ParseParameter((const char*)requestUri, "code=");
if (code.length() == 0)
{
printf("Malformed authorization response: %s\n", (const char*)requestUri);
return;
}
printf("\nAuthorization code: %s\n", (const char*)code);
_bstr_t responseText = RequestAccessToken((const char*)code, szUri);
printf("%s\n", (const char*)responseText);
IOAuthResponseParserPtr parser = NULL;
parser.CreateInstance(__uuidof(EAGetMailObjLib::OAuthResponseParser));
parser->Load(responseText);
_bstr_t user = parser->EmailInIdToken;
_bstr_t accessToken = parser->AccessToken;
if (accessToken.length() == 0)
{
printf("Failed to request access token, return!\n");
return;
}
printf("User: %s\n", (const char*)user);
printf("AccessToken: %s\n", (const char*)accessToken);
RetrieveWithXOAUTH2((const char*)user, (const char*)accessToken);
}
int main()
{
::CoInitialize(NULL);
printf(
"+------------------------------------------------------------------+\n"
" Sign in with MS OAuth \n"
" If you got \"This app isn't verified\" information in Web Browser, \n"
" click \"Advanced\" -> Go to ... to continue test.\n"
"+------------------------------------------------------------------+\n\n");
printf("Press ENTER key to sign in...\n");
getchar();
DoOauthAndRetrieveEmail();
printf("Press ENTER key to quit...\n");
getchar();
return 0;
}
Here is a console application which demonstrates how to use Microsoft OAuth to do user authentication and retrieve email using Microsoft Graph API protocol.
Note
This sample cannot handle the event of Web Browser is closed by user manually before authentication is completed.
You can refer to the better sample project which uses Web Browser Control
in EAGetMail installation path.
#include "stdafx.h" // pre-compile header
#include <stdio.h>
#include <tchar.h>
#include "C:\Program Files (x86)\EAGetMail\Include\tlh\EAGetMailObj.tlh"
using namespace EAGetMailObjLib;
#include "C:\Program Files (x86)\EAGetMail\Include\tlh\msxml3.tlh"
using namespace MSXML2;
const int MailServerPop3 = 0;
const int MailServerImap4 = 1;
const int MailServerEWS = 2;
const int MailServerDAV = 3;
const int MailServerMsGraph = 4;
const int MailServerAuthLogin = 0;
const int MailServerAuthCRAM5 = 1;
const int MailServerAuthNTLM = 2;
const int MailServerAuthXOAUTH2 = 3;
const int GetMailInfos_All = 1;
const int GetMailInfos_NewOnly = 2;
const int GetMailInfos_ReadOnly = 4;
const int GetMailInfos_SeqRange = 8;
const int GetMailInfos_UIDRange = 16;
const int GetMailInfos_PR_ENTRYID = 32;
const int GetMailInfos_DateRange = 64;
const int GetMailInfos_OrderByDateTime = 128;
DWORD _getCurrentPath(LPTSTR lpPath, DWORD nSize)
{
DWORD dwSize = ::GetModuleFileName(NULL, lpPath, nSize);
if (dwSize == 0 || dwSize == nSize)
{
return 0;
}
// Change file name to current full path
LPCTSTR psz = _tcsrchr(lpPath, _T('\\'));
if (psz != NULL)
{
lpPath[psz - lpPath] = _T('\0');
return _tcslen(lpPath);
}
return 0;
}
void RetrieveWithXOAUTH2(const char* lpszEmail, const char* lpszAccessToken)
{
try
{
TCHAR szPath[MAX_PATH + 1];
_getCurrentPath(szPath, MAX_PATH);
TCHAR szMailBox[MAX_PATH + 1];
wsprintf(szMailBox, _T("%s\\inbox"), szPath);
// Create a folder to store emails
::CreateDirectory(szMailBox, NULL);
IMailServerPtr oServer = NULL;
oServer.CreateInstance(__uuidof(EAGetMailObjLib::MailServer));
// Hotmail/Outlook/Live Graph API server address
oServer->Server = _bstr_t("graph.microsoft.com");
oServer->User = _bstr_t(lpszEmail);
// Use access token as password
oServer->Password = _bstr_t(lpszAccessToken);
// Use OAUTH 2.0
oServer->AuthType = MailServerAuthXOAUTH2;
// Use Graph API Protocol
oServer->Protocol = MailServerMsGraph;
// Enable SSL Connection
oServer->SSLConnection = VARIANT_TRUE;
IMailClientPtr oClient = NULL;
oClient.CreateInstance(__uuidof(EAGetMailObjLib::MailClient));
oClient->LicenseCode = _T("TryIt");
_tprintf(_T("Connecting %s ...\r\n"), (const TCHAR*)oServer->Server);
oClient->Connect(oServer);
// Get new email only, if you want to get all emails, please remove this line
oClient->GetMailInfosParam->GetMailInfosOptions = GetMailInfos_NewOnly;
IMailInfoCollectionPtr infos = oClient->GetMailInfoList();
_tprintf(_T("Total %d emails\r\n"), infos->Count);
for (long i = 0; i < infos->Count; i++)
{
IMailInfoPtr pInfo = infos->GetItem(i);
_tprintf(_T("Index: %d; Size: %d; UIDL: %s\r\n\r\n"),
pInfo->Index, pInfo->Size, (const TCHAR*)pInfo->UIDL);
TCHAR szFile[MAX_PATH + 1];
// Generate a random file name by current local datetime,
// You can use your method to generate the filename if you do not like it
SYSTEMTIME curtm;
::GetLocalTime(&curtm);
::wsprintf(szFile, _T("%s\\%04d%02d%02d%02d%02d%02d%03d%d.eml"),
szMailBox,
curtm.wYear,
curtm.wMonth,
curtm.wDay,
curtm.wHour,
curtm.wMinute,
curtm.wSecond,
curtm.wMilliseconds,
i);
// Receive email from POP3 server
IMailPtr oMail = oClient->GetMail(pInfo);
_tprintf(_T("From: %s\r\n"), (const TCHAR*)oMail->From->Address);
_tprintf(_T("Subject: %s\r\n"), (const TCHAR*)oMail->Subject);
// Save email to local disk
oMail->SaveAs(szFile, VARIANT_TRUE);
// Mark email as read to prevent retrieving this email again.
oClient->MarkAsRead(pInfo, VARIANT_TRUE);
// If you want to delete current email, please use Delete method instead of MarkAsRead
// oClient->Delete(pInfo);
}
// Delete method just mark the email as deleted,
// Quit method expunge the emails from server exactly.
oClient->Quit();
}
catch (_com_error &ep)
{
_tprintf(_T("Error: %s"), (const TCHAR*)ep.Description());
}
}
// client configuration
// You should create your client id and client secret,
// do not use the following client id in production environment, it is used for test purpose only.
const char* clientID = "eccbabb2-3377-4265-85c1-ea2fb515f075";
const char* clientSecret = "QaR_RR:-5WqTY[nni9pdBr9xVybqrAu4";
// Set Graph API scope
const char* scope = "Mail.Send%20Mail.ReadWrite%20offline_access%20email%20openid";
const char* authUri = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize";
const char* tokenUri = "https://login.microsoftonline.com/common/oauth2/v2.0/token";
// path?parameter1=value1¶meter2=value2#anchor;
_bstr_t ParseParameter(const char* uri, const char* key)
{
_bstr_t value = "";
if (uri == NULL || key == NULL)
return value;
const char* p = strchr(uri, '?');
p = (p != NULL) ? p + 1 : uri;
do
{
if (_strnicmp(p, key, strlen(key)) == 0)
{
p += strlen(key);
const char* pend = strpbrk(p, "&#");
if (pend != NULL)
{
char* buf = new char[pend - p + 1];
memcpy(buf, p, pend - p);
buf[pend - p] = '\0';
value = buf;
delete[] buf;
}
else
{
value = p;
}
return value;
}
p = strchr(p, '&');
if (p) p++;
} while (p);
return value;
}
_bstr_t RequestAccessToken(const char* code, const char* redirectUri)
{
printf("Exchanging code for tokens...\n");
_bstr_t responseText = "";
try
{
IServerXMLHTTPRequestPtr httpRequest = NULL;
httpRequest.CreateInstance(__uuidof(MSXML2::ServerXMLHTTP));
if (httpRequest == NULL)
{
printf("Failed to create XML HTTP Object, please make sure you install MSXML 3.0 on your machine.\n");
return responseText;
}
_bstr_t tokenRequestBody = "code=";
tokenRequestBody += code;
tokenRequestBody += "&redirect_uri=";
tokenRequestBody += redirectUri;
tokenRequestBody += "&client_id=";
tokenRequestBody += clientID;
tokenRequestBody += "&grant_type=authorization_code";
const char* postData = (const char*)tokenRequestBody;
long cdata = (long)strlen(postData);
LPSAFEARRAY psaHunk = ::SafeArrayCreateVectorEx(VT_UI1, 0, cdata, NULL);
for (long k = 0; k < cdata; k++)
{
BYTE ch = (BYTE)postData[k];
::SafeArrayPutElement(psaHunk, &k, &ch);
}
_variant_t requestBuffer;
requestBuffer.vt = (VT_ARRAY | VT_UI1);
requestBuffer.parray = psaHunk;
_variant_t async(true);
httpRequest->setOption((MSXML2::SERVERXMLHTTP_OPTION)2, 13056);
httpRequest->open(L"POST", _bstr_t(tokenUri), async, vtMissing, vtMissing);
httpRequest->setRequestHeader(L"Content-Type", L"application/x-www-form-urlencoded");
httpRequest->send(requestBuffer);
while (httpRequest->readyState != 4) {
httpRequest->waitForResponse(1);
}
long status = httpRequest->status;
responseText = httpRequest->responseText;
if (status < 200 || status >= 300)
{
printf("Failed to get access token from server: %d %s\n", status, (const char*)responseText);
}
return responseText;
}
catch (_com_error &ep)
{
printf("Failed to get access token: %s\n", (const char*)ep.Description());
}
return responseText;
}
void DoOauthAndRetrieveEmail()
{
IHttpListenerPtr httpListener = NULL;
httpListener.CreateInstance(__uuidof(EAGetMailObjLib::HttpListener));
// Creates a redirect URI using an available port on the loopback address.
if (httpListener->Create("127.0.0.1", 0) == VARIANT_FALSE)
{
printf("Failed to listen on %s\n", (const char*)httpListener->GetLastError());
return;
}
char szUri[MAX_PATH + 1];
sprintf_s(szUri, MAX_PATH, "http://127.0.0.1:%d", httpListener->ListenPort);
printf("listen on %s ...\n", szUri);
// Creates the OAuth 2.0 authorization request.
_bstr_t authorizationRequest = authUri;
authorizationRequest += "?response_type=code&scope=";
authorizationRequest += scope;
authorizationRequest += "&redirect_uri=";
authorizationRequest += szUri;
authorizationRequest += "&client_id=";
authorizationRequest += clientID;
authorizationRequest += "&prompt=login";
printf("open %s ...\n", (const char*)authorizationRequest);
// Opens request in the browser.
IBrowserUiPtr browserUi = NULL;
browserUi.CreateInstance(__uuidof(EAGetMailObjLib::BrowserUi));
browserUi->OpenUrl(authorizationRequest);
// Waits for the OAuth authorization response.
if (httpListener->GetRequestUrl(-1) == VARIANT_FALSE)
{
printf("Failed to get authorization response %s\n", (const char*)httpListener->GetLastError());
return;
}
// Brings the Console to Focus.
SetForegroundWindow(GetConsoleWindow());
// Send response and stop http listener.
httpListener->SendResponse(_bstr_t("200"),
_bstr_t("text/html; charset=utf-8"),
"<html><head></head><body>Please return to the app and close current window.</body></html>");
httpListener->Close();
_bstr_t requestUri = httpListener->RequestUrl;
printf("RequestUri: %s\n", (const char*)requestUri);
// Checks for errors.
_bstr_t error = ParseParameter((const char*)requestUri, "error=");
if (error.length())
{
printf("OAuth authorization error: %s\n", (const char*)error);
return;
}
// Check authorization code
_bstr_t code = ParseParameter((const char*)requestUri, "code=");
if (code.length() == 0)
{
printf("Malformed authorization response: %s\n", (const char*)requestUri);
return;
}
printf("\nAuthorization code: %s\n", (const char*)code);
_bstr_t responseText = RequestAccessToken((const char*)code, szUri);
printf("%s\n", (const char*)responseText);
IOAuthResponseParserPtr parser = NULL;
parser.CreateInstance(__uuidof(EAGetMailObjLib::OAuthResponseParser));
parser->Load(responseText);
_bstr_t user = parser->EmailInIdToken;
_bstr_t accessToken = parser->AccessToken;
if (accessToken.length() == 0)
{
printf("Failed to request access token, return!\n");
return;
}
printf("User: %s\n", (const char*)user);
printf("AccessToken: %s\n", (const char*)accessToken);
RetrieveWithXOAUTH2((const char*)user, (const char*)accessToken);
}
int main()
{
::CoInitialize(NULL);
printf(
"+------------------------------------------------------------------+\n"
" Sign in with MS OAuth \n"
" If you got \"This app isn't verified\" information in Web Browser, \n"
" click \"Advanced\" -> Go to ... to continue test.\n"
"+------------------------------------------------------------------+\n\n");
printf("Press ENTER key to sign in...\n");
getchar();
DoOauthAndRetrieveEmail();
printf("Press ENTER key to quit...\n");
getchar();
return 0;
}
TLS is the successor of SSL, more and more SMTP servers require TLS 1.2
encryption now.
If your operating system is Windows XP/Vista/Windows 7/Windows 2003/2008/2008 R2/2012/2012 R2
, you need to
enable TLS 1.2 protocol in your operating system like this:
Enable TLS 1.2 on Windows XP/Vista/7/10/Windows 2008/2008 R2/2012
If you are not the tenant administrator and you don’t have the permission to create or grant the application in Azure, or if your code is too complex or out of maintenance, and you don’t want to change anything in your source codes, then you can have a try with EA Oauth Service for Offic365. It provides an easy way for the legacy email application that doesn’t support OAUTH 2.0 to send and retrieve email from Office 365 without changing any codes. SMTP, POP, IMAP and SSL/TLS protocols are supported.
Appendix
Comments
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