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/* message-events.cpp - Subclass impl of IExchExtMessageEvents
* Copyright (C) 2004, 2005, 2007, 2008 g10 Code GmbH
*
* This file is part of GpgOL.
*
* GpgOL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* GpgOL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <windows.h>
#include "mymapi.h"
#include "mymapitags.h"
#include "myexchext.h"
#include "display.h"
#include "common.h"
#include "msgcache.h"
#include "mapihelp.h"
#include "olflange-def.h"
#include "olflange.h"
#include "mimeparser.h"
#include "mimemaker.h"
#include "message.h"
#include "message-events.h"
#include "explorers.h"
#include "inspectors.h"
/* Wrapper around UlRelease with error checking. */
static void
ul_release (LPVOID punk, const char *func, int lnr)
{
ULONG res;
if (!punk)
return;
res = UlRelease (punk);
if (opt.enable_debug & DBG_MEMORY)
log_debug ("%s:%s:%d: UlRelease(%p) had %lu references\n",
SRCNAME, func, lnr, punk, res);
}
/* Our constructor. */
GpgolMessageEvents::GpgolMessageEvents (GpgolExt *pParentInterface)
{
m_pExchExt = pParentInterface;
m_lRef = 0;
m_bOnSubmitActive = false;
m_want_html = false;
m_processed = false;
m_wasencrypted = false;
m_gotinspector = false;
}
/* The QueryInterfac. */
STDMETHODIMP
GpgolMessageEvents::QueryInterface (REFIID riid, LPVOID FAR *ppvObj)
{
*ppvObj = NULL;
if (riid == IID_IExchExtMessageEvents)
{
*ppvObj = (LPVOID)this;
AddRef();
return S_OK;
}
if (riid == IID_IUnknown)
{
*ppvObj = (LPVOID)m_pExchExt;
m_pExchExt->AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
static int
get_crypto_flags (HWND hwnd, bool *r_sign, bool *r_encrypt)
{
LPDISPATCH inspector;
int rc;
inspector = get_inspector_from_hwnd (hwnd);
if (!inspector)
{
log_error ("%s:%s: inspector not found", SRCNAME, __func__);
rc = -1;
}
else
{
rc = get_inspector_composer_flags (inspector, r_sign, r_encrypt);
gpgol_release (inspector);
}
return rc;
}
/* Called from Exchange on reading a message. Returns: S_FALSE to
signal Exchange to continue calling extensions. EECB is a pointer
to the IExchExtCallback interface. */
STDMETHODIMP
GpgolMessageEvents::OnRead (LPEXCHEXTCALLBACK eecb)
{
HWND hwnd = NULL;
LPMDB mdb = NULL;
LPMESSAGE message = NULL;
m_wasencrypted = false;
if (FAILED (eecb->GetWindow (&hwnd)))
hwnd = NULL;
m_gotinspector = !!is_inspector_display (hwnd);
log_debug ("%s:%s: received (hwnd=%p) %s\n",
SRCNAME, __func__, hwnd, m_gotinspector? "got_inspector":"");
/* Fixme: If preview decryption is not enabled and we have an
encrypted message, we might want to show a greyed out preview
window. There are two ways to clear the preview window:
- Change the message class to something unknown to Outlook, like
IPM.GpgOL. This shows a grey and empty preview window.
- Set flag 0x2000 in the 0x8510 property (SideEffects). This
shows a grey window with a notice that the message can't be
shown due to active content. */
/* The is_inspector_display function is not reliable enough.
Missing another solution we set it to true for now with the
result that the preview decryption can't be disabled. */
m_gotinspector = 1;
if ( (m_gotinspector || opt.preview_decrypt) && !opt.disable_gpgol )
{
eecb->GetObject (&mdb, (LPMAPIPROP *)&message);
switch (message_incoming_handler (message, hwnd, false))
{
case 1:
m_processed = true;
break;
case 2:
m_processed = true;
m_wasencrypted = true;
break;
default:
;
}
ul_release (message, __func__, __LINE__);
ul_release (mdb, __func__, __LINE__);
}
return S_FALSE;
}
/* Called by Exchange after a message has been read. Returns: S_FALSE
to signal Exchange to continue calling extensions. EECB is a
pointer to the IExchExtCallback interface. FLAGS are some flags. */
STDMETHODIMP
GpgolMessageEvents::OnReadComplete (LPEXCHEXTCALLBACK eecb, ULONG flags)
{
log_debug ("%s:%s: received; flags=%#lx m_processed=%d \n",
SRCNAME, __func__, flags, m_processed);
/* If the message has been processed by us (i.e. in OnRead), we now
use our own display code. */
if (!flags && m_processed && !opt.disable_gpgol)
{
HRESULT hr;
LPMDB mdb = NULL;
LPMESSAGE message = NULL;
HWND hwnd = NULL;
if (FAILED (eecb->GetWindow (&hwnd)))
hwnd = NULL;
hr = eecb->GetObject (&mdb, (LPMAPIPROP *)&message);
if (hr != S_OK || !message)
log_error ("%s:%s: error getting message: hr=%#lx",
SRCNAME, __func__, hr);
else
{
LPDISPATCH inspector;
LPDISPATCH obj;
inspector = get_inspector_from_hwnd (hwnd);
if (!inspector)
{
/* No inspector available. We now force the creation of
a new inspector by using the GetInspector method for
the current MailItem. In theory we could do this
always but we better try the *from_hwnd method first
as this will not create a new inspector in OL2007 if
one already exists. Not a real problem for OnRead
but we had this problem in OnWrite. */
obj = get_eecb_object (eecb);
if (obj)
{
inspector = get_oom_object (obj, "GetInspector");
if (opt.enable_debug & DBG_OOM)
log_debug ("%s:%s: %p->GetInspector returned %p",
SRCNAME, __func__, obj, inspector);
gpgol_release (obj);
}
}
message_display_handler (message, inspector, hwnd);
if (inspector)
gpgol_release (inspector);
}
if (message)
gpgol_release (message);
if (mdb)
gpgol_release (mdb);
}
return S_FALSE;
}
/* Called by Exchange when a message will be written. Returns: S_FALSE
to signal Exchange to continue calling extensions. EECB is a
pointer to the IExchExtCallback interface. */
STDMETHODIMP
GpgolMessageEvents::OnWrite (LPEXCHEXTCALLBACK eecb)
{
LPDISPATCH obj;
HWND hwnd = NULL;
bool sign, encrypt, need_crypto;
int bodyfmt;
if (FAILED (eecb->GetWindow (&hwnd)))
hwnd = NULL;
log_debug ("%s:%s: received (hwnd=%p)", SRCNAME, __func__, hwnd);
need_crypto = (!get_crypto_flags (hwnd, &sign, &encrypt)
&& (sign || encrypt));
/* If we are going to encrypt, check that the BodyFormat is
something we support. This helps avoiding surprise by sending
out unencrypted messages. */
if (need_crypto && !opt.disable_gpgol)
{
obj = get_eecb_object (eecb);
if (!obj)
bodyfmt = -1;
else
{
bodyfmt = get_oom_int (obj, "BodyFormat");
gpgol_release (obj);
}
if (bodyfmt == 1)
m_want_html = 0;
else if (bodyfmt == 2)
m_want_html = 1;
else
{
log_debug ("%s:%s: BodyFormat is %d", SRCNAME, __func__, bodyfmt);
MessageBox (hwnd,
_("Sorry, we can only encrypt plain text messages and\n"
"no RTF messages. Please make sure that only the text\n"
"format has been selected."),
"GpgOL", MB_ICONERROR|MB_OK);
m_bWriteFailed = TRUE;
return E_FAIL;
}
}
return S_FALSE;
}
/* Called by Exchange when the data has been written to the message.
Encrypts and signs the message if the options are set. EECB is a
pointer to the IExchExtCallback interface. Returns: S_FALSE to
signal Exchange to continue calling extensions. We return E_FAIL
to signals Exchange an error; the message will not be sent. Note
that we don't return S_OK because this would mean that we rolled
back the write operation and that no further extensions should be
called. */
STDMETHODIMP
GpgolMessageEvents::OnWriteComplete (LPEXCHEXTCALLBACK eecb, ULONG flags)
{
HRESULT hrReturn = S_FALSE;
LPMESSAGE msg = NULL;
LPMDB pMDB = NULL;
HWND hwnd = NULL;
int rc;
if (FAILED(eecb->GetWindow (&hwnd)))
hwnd = NULL;
log_debug ("%s:%s: received (hwnd=%p)", SRCNAME, __func__, hwnd);
if (flags & (EEME_FAILED|EEME_COMPLETE_FAILED))
return S_FALSE; /* We don't need to rollback anything in case
other extensions flagged a failure. */
if (opt.disable_gpgol)
return S_FALSE;
if (!m_bOnSubmitActive) /* The user is just saving the message. */
return S_FALSE;
if (m_bWriteFailed) /* Operation failed already. */
return S_FALSE;
/* Get the object and call the encryption or signing function. */
HRESULT hr = eecb->GetObject (&pMDB, (LPMAPIPROP *)&msg);
if (SUCCEEDED (hr))
{
protocol_t proto = PROTOCOL_UNKNOWN; /* Let the UI server select
the protocol. */
bool sign, encrypt;
if (get_crypto_flags (hwnd, &sign, &encrypt))
rc = -1;
else if (encrypt && sign)
rc = message_sign_encrypt (msg, proto, hwnd);
else if (encrypt && !sign)
rc = message_encrypt (msg, proto, hwnd);
else if (!encrypt && sign)
rc = message_sign (msg, proto, hwnd);
else
{
/* In case this is a forward message which is not to be
signed or encrypted we need to remove a possible body
attachment. */
if (mapi_delete_gpgol_body_attachment (msg))
mapi_save_changes (msg, KEEP_OPEN_READWRITE);
rc = 0;
}
if (rc)
{
hrReturn = E_FAIL;
m_bWriteFailed = TRUE;
}
}
ul_release (msg, __func__, __LINE__);
ul_release (pMDB, __func__, __LINE__);
return hrReturn;
}
/* Called by Exchange when the user selects the "check names" command.
EECB is a pointer to the IExchExtCallback interface. Returns
S_FALSE to signal Exchange to continue calling extensions. */
STDMETHODIMP
GpgolMessageEvents::OnCheckNames(LPEXCHEXTCALLBACK eecb)
{
(void)eecb;
log_debug ("%s:%s: received\n", SRCNAME, __func__);
return S_FALSE;
}
/* Called by Exchange when "check names" command is complete.
EECB is a pointer to the IExchExtCallback interface. Returns
S_FALSE to signal Exchange to continue calling extensions. */
STDMETHODIMP
GpgolMessageEvents::OnCheckNamesComplete (LPEXCHEXTCALLBACK eecb,ULONG flags)
{
(void)eecb;
(void)flags;
log_debug ("%s:%s: received\n", SRCNAME, __func__);
return S_FALSE;
}
/* Called by Exchange before the message data will be written and
submitted to MAPI. EECB is a pointer to the IExchExtCallback
interface. Returns S_FALSE to signal Exchange to continue calling
extensions. */
STDMETHODIMP
GpgolMessageEvents::OnSubmit (LPEXCHEXTCALLBACK eecb)
{
(void)eecb;
log_debug ("%s:%s: received\n", SRCNAME, __func__);
m_bOnSubmitActive = TRUE;
m_bWriteFailed = FALSE;
return S_FALSE;
}
/* Called by Exchange after the message has been submitted to MAPI.
EECB is a pointer to the IExchExtCallback interface. */
STDMETHODIMP_ (VOID)
GpgolMessageEvents::OnSubmitComplete (LPEXCHEXTCALLBACK eecb, ULONG flags)
{
(void)eecb;
(void)flags;
log_debug ("%s:%s: received\n", SRCNAME, __func__);
m_bOnSubmitActive = FALSE;
}

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