/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsMsgMdnGenerator.h"
#include "nsImapCore.h"
#include "nsIMsgImapMailFolder.h"
#include "nsIMsgAccountManager.h"
#include "nsMimeTypes.h"
#include "prprf.h"
#include "prmem.h"
#include "prsystem.h"
#include "nsMsgI18N.h"
#include "nsMailHeaders.h"
#include "nsMsgLocalFolderHdrs.h"
#include "nsIHttpProtocolHandler.h"
#include "nsISmtpService.h"  // for actually sending the message...
#include "nsComposeStrings.h"
#include "nsISmtpServer.h"
#include "nsIPrompt.h"
#include "nsIMsgCompUtils.h"
#include "nsIPrefService.h"
#include "nsIPrefBranch.h"
#include "nsIStringBundle.h"
#include "nsDirectoryServiceDefs.h"
#include "nsMsgUtils.h"
#include "nsNetUtil.h"
#include "nsIMsgDatabase.h"
#include "mozilla/Components.h"
#include "mozilla/mailnews/MimeHeaderParser.h"
#include "mozilla/Unused.h"
#include "nsIPromptService.h"
#include "nsEmbedCID.h"

using namespace mozilla::mailnews;

#define MDN_NOT_IN_TO_CC ((int)0x0001)
#define MDN_OUTSIDE_DOMAIN ((int)0x0002)

#define HEADER_RETURN_PATH "Return-Path"
#define HEADER_DISPOSITION_NOTIFICATION_TO "Disposition-Notification-To"
#define HEADER_APPARENTLY_TO "Apparently-To"
#define HEADER_ORIGINAL_RECIPIENT "Original-Recipient"
#define HEADER_REPORTING_UA "Reporting-UA"
#define HEADER_MDN_GATEWAY "MDN-Gateway"
#define HEADER_FINAL_RECIPIENT "Final-Recipient"
#define HEADER_DISPOSITION "Disposition"
#define HEADER_ORIGINAL_MESSAGE_ID "Original-Message-ID"
#define HEADER_FAILURE "Failure"
#define HEADER_ERROR "Error"
#define HEADER_WARNING "Warning"
#define HEADER_RETURN_RECEIPT_TO "Return-Receipt-To"
#define HEADER_X_ACCEPT_LANGUAGE "X-Accept-Language"

#define PUSH_N_FREE_STRING(p)        \
  do {                               \
    if (p) {                         \
      rv = WriteString(p);           \
      PR_smprintf_free(p);           \
      p = 0;                         \
      if (NS_FAILED(rv)) return rv;  \
    } else {                         \
      return NS_ERROR_OUT_OF_MEMORY; \
    }                                \
  } while (0)

// String bundle for mdn. Class static.
#define MDN_STRINGBUNDLE_URL "chrome://messenger/locale/msgmdn.properties"

#if defined(DEBUG_jefft)
#  define DEBUG_MDN(s) printf("%s\n", s)
#else
#  define DEBUG_MDN(s)
#endif

// machine parsible string; should not be localized
char DispositionTypes[7][16] = {
    "displayed", "dispatched", "processed", "deleted", "denied", "failed", ""};

NS_IMPL_ISUPPORTS(nsMsgMdnGenerator, nsIMsgMdnGenerator, nsIUrlListener)

nsMsgMdnGenerator::nsMsgMdnGenerator()
    : m_disposeType(eDisplayed),
      m_key(nsMsgKey_None),
      m_notInToCcOp(eNeverSendOp),
      m_outsideDomainOp(eNeverSendOp),
      m_otherOp(eNeverSendOp),
      m_reallySendMdn(false),
      m_autoSend(false),
      m_autoAction(false),
      m_mdnEnabled(false) {}

nsMsgMdnGenerator::~nsMsgMdnGenerator() {}

nsresult nsMsgMdnGenerator::FormatStringFromName(const char* aName,
                                                 const nsString& aString,
                                                 nsAString& aResultString) {
  DEBUG_MDN("nsMsgMdnGenerator::FormatStringFromName");

  nsCOMPtr<nsIStringBundleService> bundleService =
      mozilla::components::StringBundle::Service();
  NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);

  nsCOMPtr<nsIStringBundle> bundle;
  nsresult rv =
      bundleService->CreateBundle(MDN_STRINGBUNDLE_URL, getter_AddRefs(bundle));
  NS_ENSURE_SUCCESS(rv, rv);

  AutoTArray<nsString, 1> formatStrings = {aString};
  rv = bundle->FormatStringFromName(aName, formatStrings, aResultString);
  NS_ENSURE_SUCCESS(rv, rv);
  return rv;
}

nsresult nsMsgMdnGenerator::GetStringFromName(const char* aName,
                                              nsAString& aResultString) {
  DEBUG_MDN("nsMsgMdnGenerator::GetStringFromName");

  nsCOMPtr<nsIStringBundleService> bundleService =
      mozilla::components::StringBundle::Service();
  NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);

  nsCOMPtr<nsIStringBundle> bundle;
  nsresult rv =
      bundleService->CreateBundle(MDN_STRINGBUNDLE_URL, getter_AddRefs(bundle));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = bundle->GetStringFromName(aName, aResultString);
  NS_ENSURE_SUCCESS(rv, rv);
  return rv;
}

nsresult nsMsgMdnGenerator::StoreMDNSentFlag(nsIMsgFolder* folder,
                                             nsMsgKey key) {
  DEBUG_MDN("nsMsgMdnGenerator::StoreMDNSentFlag");

  nsCOMPtr<nsIMsgDatabase> msgDB;
  nsresult rv = folder->GetMsgDatabase(getter_AddRefs(msgDB));
  NS_ENSURE_SUCCESS(rv, rv);
  rv = msgDB->MarkMDNSent(key, true, nullptr);

  nsCOMPtr<nsIMsgImapMailFolder> imapFolder = do_QueryInterface(folder);
  // Store the $MDNSent flag if the folder is an Imap Mail Folder
  if (imapFolder)
    return imapFolder->StoreImapFlags(kImapMsgMDNSentFlag, true, {key},
                                      nullptr);
  return rv;
}

nsresult nsMsgMdnGenerator::ClearMDNNeededFlag(nsIMsgFolder* folder,
                                               nsMsgKey key) {
  DEBUG_MDN("nsMsgMdnGenerator::ClearMDNNeededFlag");

  nsCOMPtr<nsIMsgDatabase> msgDB;
  nsresult rv = folder->GetMsgDatabase(getter_AddRefs(msgDB));
  NS_ENSURE_SUCCESS(rv, rv);
  return msgDB->MarkMDNNeeded(key, false, nullptr);
}

bool nsMsgMdnGenerator::ProcessSendMode() {
  DEBUG_MDN("nsMsgMdnGenerator::ProcessSendMode");
  int32_t miscState = 0;

  if (m_identity) {
    m_identity->GetEmail(m_email);
    if (m_email.IsEmpty()) return m_reallySendMdn;

    const char* accountDomain = strchr(m_email.get(), '@');
    if (!accountDomain) return m_reallySendMdn;

    if (MailAddrMatch(m_email.get(),
                      m_dntRrt.get()))  // return address is self, don't send
      return false;

    // *** fix me see Bug 132504 for more information
    // *** what if the message has been filtered to different account
    if (!PL_strcasestr(m_dntRrt.get(), accountDomain))
      miscState |= MDN_OUTSIDE_DOMAIN;
    if (NotInToOrCc()) miscState |= MDN_NOT_IN_TO_CC;
    m_reallySendMdn = true;
    // *********
    // How are we gona deal with the auto forwarding issues? Some server
    // didn't bother to add addition header or modify existing header to
    // the message when forwarding. They simply copy the exact same
    // message to another user's mailbox. Some change To: to
    // Apparently-To:
    // Unfortunately, there is nothing we can do. It's out of our control.
    // *********
    // starting from lowest denominator to highest
    if (!miscState) {  // under normal situation: recipent is in to and cc list,
      // and the sender is from the same domain
      switch (m_otherOp) {
        default:
        case eNeverSendOp:
          m_reallySendMdn = false;
          break;
        case eAutoSendOp:
          m_autoSend = true;
          break;
        case eAskMeOp:
          m_autoSend = false;
          break;
        case eDeniedOp:
          m_autoSend = true;
          m_disposeType = eDenied;
          break;
      }
    } else if (miscState == (MDN_OUTSIDE_DOMAIN | MDN_NOT_IN_TO_CC)) {
      if (m_outsideDomainOp != m_notInToCcOp) {
        m_autoSend = false;  // ambiguous; always ask user
      } else {
        switch (m_outsideDomainOp) {
          default:
          case eNeverSendOp:
            m_reallySendMdn = false;
            break;
          case eAutoSendOp:
            m_autoSend = true;
            break;
          case eAskMeOp:
            m_autoSend = false;
            break;
        }
      }
    } else if (miscState & MDN_OUTSIDE_DOMAIN) {
      switch (m_outsideDomainOp) {
        default:
        case eNeverSendOp:
          m_reallySendMdn = false;
          break;
        case eAutoSendOp:
          m_autoSend = true;
          break;
        case eAskMeOp:
          m_autoSend = false;
          break;
      }
    } else if (miscState & MDN_NOT_IN_TO_CC) {
      switch (m_notInToCcOp) {
        default:
        case eNeverSendOp:
          m_reallySendMdn = false;
          break;
        case eAutoSendOp:
          m_autoSend = true;
          break;
        case eAskMeOp:
          m_autoSend = false;
          break;
      }
    }
  }
  return m_reallySendMdn;
}

bool nsMsgMdnGenerator::MailAddrMatch(const char* addr1, const char* addr2) {
  // Comparing two email addresses returns true if matched; local/account
  // part comparison is case sensitive; domain part comparison is case
  // insensitive
  DEBUG_MDN("nsMsgMdnGenerator::MailAddrMatch");
  bool isMatched = true;
  const char *atSign1 = nullptr, *atSign2 = nullptr;
  const char *lt = nullptr, *local1 = nullptr, *local2 = nullptr;
  const char *end1 = nullptr, *end2 = nullptr;

  if (!addr1 || !addr2) return false;

  lt = strchr(addr1, '<');
  local1 = !lt ? addr1 : lt + 1;
  lt = strchr(addr2, '<');
  local2 = !lt ? addr2 : lt + 1;
  end1 = strchr(local1, '>');
  if (!end1) end1 = addr1 + strlen(addr1);
  end2 = strchr(local2, '>');
  if (!end2) end2 = addr2 + strlen(addr2);
  atSign1 = strchr(local1, '@');
  atSign2 = strchr(local2, '@');
  if (!atSign1 || !atSign2  // ill formed addr spec
      || (atSign1 - local1) != (atSign2 - local2))
    isMatched = false;
  else if (strncmp(local1, local2, (atSign1 - local1)))  // case sensitive
    // compare for local part
    isMatched = false;
  else if ((end1 - atSign1) != (end2 - atSign2) ||
           PL_strncasecmp(atSign1, atSign2, (end1 - atSign1)))  // case
    // insensitive compare for domain part
    isMatched = false;
  return isMatched;
}

bool nsMsgMdnGenerator::NotInToOrCc() {
  DEBUG_MDN("nsMsgMdnGenerator::NotInToOrCc");
  nsCString reply_to;
  nsCString to;
  nsCString cc;

  m_identity->GetReplyTo(reply_to);
  m_headers->ExtractHeader(HEADER_TO, true, to);
  m_headers->ExtractHeader(HEADER_CC, true, cc);

  // start with a simple check
  if ((!to.IsEmpty() && PL_strcasestr(to.get(), m_email.get())) ||
      (!cc.IsEmpty() && PL_strcasestr(cc.get(), m_email.get()))) {
    return false;
  }

  if ((!reply_to.IsEmpty() && !to.IsEmpty() &&
       PL_strcasestr(to.get(), reply_to.get())) ||
      (!reply_to.IsEmpty() && !cc.IsEmpty() &&
       PL_strcasestr(cc.get(), reply_to.get()))) {
    return false;
  }
  return true;
}

bool nsMsgMdnGenerator::ValidateReturnPath() {
  DEBUG_MDN("nsMsgMdnGenerator::ValidateReturnPath");
  // ValidateReturnPath applies to Automatic Send Mode only. If we were not
  // in auto send mode we simply by passing the check
  if (!m_autoSend) return m_reallySendMdn;

  nsCString returnPath;
  m_headers->ExtractHeader(HEADER_RETURN_PATH, false, returnPath);
  if (returnPath.IsEmpty()) {
    m_autoSend = false;
    return m_reallySendMdn;
  }
  m_autoSend = MailAddrMatch(returnPath.get(), m_dntRrt.get());
  return m_reallySendMdn;
}

nsresult nsMsgMdnGenerator::CreateMdnMsg() {
  DEBUG_MDN("nsMsgMdnGenerator::CreateMdnMsg");
  nsresult rv;

  nsCOMPtr<nsIFile> tmpFile;
  rv = GetSpecialDirectoryWithFileName(NS_OS_TEMP_DIR, "mdnmsg",
                                       getter_AddRefs(m_file));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = m_file->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 00600);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = MsgNewBufferedFileOutputStream(getter_AddRefs(m_outputStream), m_file,
                                      PR_CREATE_FILE | PR_WRONLY | PR_TRUNCATE,
                                      0664);
  NS_ASSERTION(NS_SUCCEEDED(rv), "creating mdn: failed to output stream");
  if (NS_FAILED(rv)) return NS_OK;

  rv = CreateFirstPart();
  if (NS_SUCCEEDED(rv)) {
    rv = CreateSecondPart();
    if (NS_SUCCEEDED(rv)) rv = CreateThirdPart();
  }

  if (m_outputStream) {
    m_outputStream->Flush();
    m_outputStream->Close();
  }
  if (NS_FAILED(rv))
    m_file->Remove(false);
  else
    rv = SendMdnMsg();

  return NS_OK;
}

nsresult nsMsgMdnGenerator::CreateFirstPart() {
  DEBUG_MDN("nsMsgMdnGenerator::CreateFirstPart");
  char *convbuf = nullptr, *tmpBuffer = nullptr;
  char* parm = nullptr;
  nsString firstPart1;
  nsString firstPart2;
  nsresult rv = NS_OK;
  nsCOMPtr<nsIMsgCompUtils> compUtils;

  if (m_mimeSeparator.IsEmpty()) {
    compUtils = do_GetService("@mozilla.org/messengercompose/computils;1", &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = compUtils->MimeMakeSeparator("mdn", getter_Copies(m_mimeSeparator));
    NS_ENSURE_SUCCESS(rv, rv);
  }
  if (m_mimeSeparator.IsEmpty()) return NS_ERROR_OUT_OF_MEMORY;

  tmpBuffer = (char*)PR_CALLOC(256);

  if (!tmpBuffer) return NS_ERROR_OUT_OF_MEMORY;

  PRExplodedTime now;
  PR_ExplodeTime(PR_Now(), PR_LocalTimeParameters, &now);

  int gmtoffset =
      (now.tm_params.tp_gmt_offset + now.tm_params.tp_dst_offset) / 60;
  /* Use PR_FormatTimeUSEnglish() to format the date in US English format,
     then figure out what our local GMT offset is, and append it (since
     PR_FormatTimeUSEnglish() can't do that.) Generate four digit years as
     per RFC 1123 (superseding RFC 822.)
  */
  PR_FormatTimeUSEnglish(tmpBuffer, 100, "Date: %a, %d %b %Y %H:%M:%S ", &now);

  PR_snprintf(tmpBuffer + strlen(tmpBuffer), 100, "%c%02d%02d" CRLF,
              (gmtoffset >= 0 ? '+' : '-'),
              ((gmtoffset >= 0 ? gmtoffset : -gmtoffset) / 60),
              ((gmtoffset >= 0 ? gmtoffset : -gmtoffset) % 60));

  rv = WriteString(tmpBuffer);
  PR_Free(tmpBuffer);
  if (NS_FAILED(rv)) return rv;

  bool conformToStandard = false;
  if (compUtils) compUtils->GetMsgMimeConformToStandard(&conformToStandard);

  nsString fullName;
  m_identity->GetFullName(fullName);

  nsCString fullAddress;
  // convert fullName to UTF8 before passing it to MakeMimeAddress
  MakeMimeAddress(NS_ConvertUTF16toUTF8(fullName), m_email, fullAddress);

  convbuf = nsMsgI18NEncodeMimePartIIStr(fullAddress.get(), true, "UTF-8", 0,
                                         conformToStandard);

  parm = PR_smprintf("From: %s" CRLF, convbuf ? convbuf : m_email.get());

  rv = FormatStringFromName("MsgMdnMsgSentTo", NS_ConvertASCIItoUTF16(m_email),
                            firstPart1);
  if (NS_FAILED(rv)) return rv;

  PUSH_N_FREE_STRING(parm);

  PR_Free(convbuf);

  if (compUtils) {
    nsCString msgId;
    rv = compUtils->MsgGenerateMessageId(m_identity, ""_ns, msgId);
    NS_ENSURE_SUCCESS(rv, rv);

    tmpBuffer = PR_smprintf("Message-ID: %s" CRLF, msgId.get());
    PUSH_N_FREE_STRING(tmpBuffer);
  }

  nsString receipt_string;
  switch (m_disposeType) {
    case nsIMsgMdnGenerator::eDisplayed:
      rv = GetStringFromName("MdnDisplayedReceipt", receipt_string);
      break;
    case nsIMsgMdnGenerator::eDispatched:
      rv = GetStringFromName("MdnDispatchedReceipt", receipt_string);
      break;
    case nsIMsgMdnGenerator::eProcessed:
      rv = GetStringFromName("MdnProcessedReceipt", receipt_string);
      break;
    case nsIMsgMdnGenerator::eDeleted:
      rv = GetStringFromName("MdnDeletedReceipt", receipt_string);
      break;
    case nsIMsgMdnGenerator::eDenied:
      rv = GetStringFromName("MdnDeniedReceipt", receipt_string);
      break;
    case nsIMsgMdnGenerator::eFailed:
      rv = GetStringFromName("MdnFailedReceipt", receipt_string);
      break;
    default:
      rv = NS_ERROR_INVALID_ARG;
      break;
  }

  if (NS_FAILED(rv)) return rv;

  receipt_string.AppendLiteral(" - ");

  char* encodedReceiptString =
      nsMsgI18NEncodeMimePartIIStr(NS_ConvertUTF16toUTF8(receipt_string).get(),
                                   false, "UTF-8", 0, conformToStandard);

  nsCString subject;
  m_headers->ExtractHeader(HEADER_SUBJECT, false, subject);
  convbuf = nsMsgI18NEncodeMimePartIIStr(
      subject.Length() ? subject.get() : "[no subject]", false, "UTF-8", 0,
      conformToStandard);
  tmpBuffer = PR_smprintf(
      "Subject: %s%s" CRLF, encodedReceiptString,
      (convbuf ? convbuf
               : (subject.Length() ? subject.get() : "[no subject]")));

  PUSH_N_FREE_STRING(tmpBuffer);
  PR_Free(convbuf);
  PR_Free(encodedReceiptString);

  convbuf = nsMsgI18NEncodeMimePartIIStr(m_dntRrt.get(), true, "UTF-8", 0,
                                         conformToStandard);
  tmpBuffer = PR_smprintf("To: %s" CRLF, convbuf ? convbuf : m_dntRrt.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  PR_Free(convbuf);

  // *** This is not in the spec. I am adding this so we could do
  // threading
  m_headers->ExtractHeader(HEADER_MESSAGE_ID, false, m_messageId);

  if (!m_messageId.IsEmpty()) {
    if (*m_messageId.get() == '<')
      tmpBuffer = PR_smprintf("References: %s" CRLF, m_messageId.get());
    else
      tmpBuffer = PR_smprintf("References: <%s>" CRLF, m_messageId.get());
    PUSH_N_FREE_STRING(tmpBuffer);
  }
  tmpBuffer = PR_smprintf("%s" CRLF, "MIME-Version: 1.0");
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf(
      "Content-Type: multipart/report; \
report-type=disposition-notification;\r\n\tboundary=\"%s\"" CRLF CRLF,
      m_mimeSeparator.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf("--%s" CRLF, m_mimeSeparator.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf("Content-Type: text/plain; charset=UTF-8" CRLF);
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer =
      PR_smprintf("Content-Transfer-Encoding: %s" CRLF CRLF, ENCODING_8BIT);
  PUSH_N_FREE_STRING(tmpBuffer);

  if (!firstPart1.IsEmpty()) {
    tmpBuffer =
        PR_smprintf("%s" CRLF CRLF, NS_ConvertUTF16toUTF8(firstPart1).get());
    PUSH_N_FREE_STRING(tmpBuffer);
  }

  switch (m_disposeType) {
    case nsIMsgMdnGenerator::eDisplayed:
      rv = GetStringFromName("MsgMdnDisplayed", firstPart2);
      break;
    case nsIMsgMdnGenerator::eDispatched:
      rv = GetStringFromName("MsgMdnDispatched", firstPart2);
      break;
    case nsIMsgMdnGenerator::eProcessed:
      rv = GetStringFromName("MsgMdnProcessed", firstPart2);
      break;
    case nsIMsgMdnGenerator::eDeleted:
      rv = GetStringFromName("MsgMdnDeleted", firstPart2);
      break;
    case nsIMsgMdnGenerator::eDenied:
      rv = GetStringFromName("MsgMdnDenied", firstPart2);
      break;
    case nsIMsgMdnGenerator::eFailed:
      rv = GetStringFromName("MsgMdnFailed", firstPart2);
      break;
    default:
      rv = NS_ERROR_INVALID_ARG;
      break;
  }

  if (NS_FAILED(rv)) return rv;

  if (!firstPart2.IsEmpty()) {
    tmpBuffer =
        PR_smprintf("%s" CRLF CRLF, NS_ConvertUTF16toUTF8(firstPart2).get());
    PUSH_N_FREE_STRING(tmpBuffer);
  }

  return rv;
}

nsresult nsMsgMdnGenerator::CreateSecondPart() {
  DEBUG_MDN("nsMsgMdnGenerator::CreateSecondPart");
  char* tmpBuffer = nullptr;
  char* convbuf = nullptr;
  nsresult rv = NS_OK;
  nsCOMPtr<nsIMsgCompUtils> compUtils;
  bool conformToStandard = false;

  tmpBuffer = PR_smprintf("--%s" CRLF, m_mimeSeparator.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf("%s" CRLF,
                          "Content-Type: message/disposition-notification; "
                          "name=\042MDNPart2.txt\042");
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf("%s" CRLF, "Content-Disposition: inline");
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer =
      PR_smprintf("Content-Transfer-Encoding: %s" CRLF CRLF, ENCODING_7BIT);
  PUSH_N_FREE_STRING(tmpBuffer);

  nsCOMPtr<nsIHttpProtocolHandler> pHTTPHandler =
      do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &rv);
  if (NS_SUCCEEDED(rv) && pHTTPHandler) {
    bool sendUserAgent = false;
    nsCOMPtr<nsIPrefBranch> prefBranch(
        do_GetService(NS_PREFSERVICE_CONTRACTID, &rv));
    if (NS_SUCCEEDED(rv) && prefBranch) {
      prefBranch->GetBoolPref("mailnews.headers.sendUserAgent", &sendUserAgent);
    }

    if (sendUserAgent) {
      bool useMinimalUserAgent = false;
      if (prefBranch) {
        prefBranch->GetBoolPref("mailnews.headers.useMinimalUserAgent",
                                &useMinimalUserAgent);
      }
      if (useMinimalUserAgent) {
        nsCOMPtr<nsIStringBundleService> bundleService =
            mozilla::components::StringBundle::Service();
        if (bundleService) {
          nsCOMPtr<nsIStringBundle> brandBundle;
          rv = bundleService->CreateBundle(
              "chrome://branding/locale/brand.properties",
              getter_AddRefs(brandBundle));
          if (NS_SUCCEEDED(rv)) {
            nsString brandName;
            brandBundle->GetStringFromName("brandFullName", brandName);
            if (!brandName.IsEmpty()) {
              NS_ConvertUTF16toUTF8 ua8(brandName);
              tmpBuffer = PR_smprintf("Reporting-UA: %s" CRLF, ua8.get());
              PUSH_N_FREE_STRING(tmpBuffer);
            }
          }
        }
      } else {
        nsAutoCString userAgentString;
        // Ignore error since we're testing the return value.
        mozilla::Unused << pHTTPHandler->GetUserAgent(userAgentString);

        if (!userAgentString.IsEmpty()) {
          // Prepend the product name with the dns name according to RFC 3798.
          char hostName[256];
          PR_GetSystemInfo(PR_SI_HOSTNAME_UNTRUNCATED, hostName,
                           sizeof hostName);
          if ((hostName[0] != '\0') && (strchr(hostName, '.') != NULL)) {
            userAgentString.InsertLiteral("; ", 0);
            userAgentString.Insert(nsDependentCString(hostName), 0);
          }

          tmpBuffer =
              PR_smprintf("Reporting-UA: %s" CRLF, userAgentString.get());
          PUSH_N_FREE_STRING(tmpBuffer);
        }
      }
    }
  }

  nsCString originalRecipient;
  m_headers->ExtractHeader(HEADER_ORIGINAL_RECIPIENT, false, originalRecipient);

  if (!originalRecipient.IsEmpty()) {
    tmpBuffer =
        PR_smprintf("Original-Recipient: %s" CRLF, originalRecipient.get());
    PUSH_N_FREE_STRING(tmpBuffer);
  }

  compUtils = do_GetService("@mozilla.org/messengercompose/computils;1", &rv);
  if (compUtils) compUtils->GetMsgMimeConformToStandard(&conformToStandard);

  convbuf = nsMsgI18NEncodeMimePartIIStr(m_email.get(), true, "UTF-8", 0,
                                         conformToStandard);
  tmpBuffer = PR_smprintf("Final-Recipient: rfc822;%s" CRLF,
                          convbuf ? convbuf : m_email.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  PR_Free(convbuf);

  if (*m_messageId.get() == '<')
    tmpBuffer = PR_smprintf("Original-Message-ID: %s" CRLF, m_messageId.get());
  else
    tmpBuffer =
        PR_smprintf("Original-Message-ID: <%s>" CRLF, m_messageId.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer =
      PR_smprintf("Disposition: %s/%s; %s" CRLF CRLF,
                  (m_autoAction ? "automatic-action" : "manual-action"),
                  (m_autoSend ? "MDN-sent-automatically" : "MDN-sent-manually"),
                  DispositionTypes[(int)m_disposeType]);
  PUSH_N_FREE_STRING(tmpBuffer);

  return rv;
}

nsresult nsMsgMdnGenerator::CreateThirdPart() {
  DEBUG_MDN("nsMsgMdnGenerator::CreateThirdPart");
  char* tmpBuffer = nullptr;
  nsresult rv = NS_OK;

  tmpBuffer = PR_smprintf("--%s" CRLF, m_mimeSeparator.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf(
      "%s" CRLF,
      "Content-Type: text/rfc822-headers; name=\042MDNPart3.txt\042");
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf("%s" CRLF, "Content-Transfer-Encoding: 7bit");
  PUSH_N_FREE_STRING(tmpBuffer);

  tmpBuffer = PR_smprintf("%s" CRLF CRLF, "Content-Disposition: inline");
  PUSH_N_FREE_STRING(tmpBuffer);

  rv = OutputAllHeaders();

  if (NS_FAILED(rv)) return rv;

  rv = WriteString(CRLF);
  if (NS_FAILED(rv)) return rv;

  tmpBuffer = PR_smprintf("--%s--" CRLF, m_mimeSeparator.get());
  PUSH_N_FREE_STRING(tmpBuffer);

  return rv;
}

nsresult nsMsgMdnGenerator::OutputAllHeaders() {
  DEBUG_MDN("nsMsgMdnGenerator::OutputAllHeaders");
  nsCString all_headers;
  int32_t all_headers_size = 0;
  nsresult rv = NS_OK;

  rv = m_headers->GetAllHeaders(all_headers);
  if (NS_FAILED(rv)) return rv;
  all_headers_size = all_headers.Length();
  char *buf = (char*)all_headers.get(),
       *buf_end = (char*)all_headers.get() + all_headers_size;
  char *start = buf, *end = buf;

  while (buf < buf_end) {
    switch (*buf) {
      case 0:
        if (*(buf + 1) == '\n') {
          // *buf = '\r';
          end = buf;
        } else if (*(buf + 1) == 0) {
          // the case of message id
          *buf = '>';
        }
        break;
      case '\r':
        end = buf;
        *buf = 0;
        break;
      case '\n':
        if (buf > start && *(buf - 1) == 0) {
          start = buf + 1;
          end = start;
        } else {
          end = buf;
        }
        *buf = 0;
        break;
      default:
        break;
    }
    buf++;

    if (end > start && *end == 0) {
      // strip out private X-Mozilla-Status header & X-Mozilla-Draft-Info &&
      // envelope header
      if (!PL_strncasecmp(start, X_MOZILLA_STATUS, X_MOZILLA_STATUS_LEN) ||
          !PL_strncasecmp(start, X_MOZILLA_DRAFT_INFO,
                          X_MOZILLA_DRAFT_INFO_LEN) ||
          !PL_strncasecmp(start, "From ", 5)) {
        while (end < buf_end && (*end == '\n' || *end == '\r' || *end == 0))
          end++;
        start = end;
      } else {
        NS_ASSERTION(*end == 0, "content of end should be null");
        rv = WriteString(start);
        NS_ENSURE_SUCCESS(rv, rv);
        rv = WriteString(CRLF);
        NS_ENSURE_SUCCESS(rv, rv);
        while (end < buf_end && (*end == '\n' || *end == '\r' || *end == 0))
          end++;
        start = end;
      }
      buf = start;
    }
  }
  return NS_OK;
}

nsresult nsMsgMdnGenerator::SendMdnMsg() {
  DEBUG_MDN("nsMsgMdnGenerator::SendMdnMsg");
  nsresult rv;
  nsCOMPtr<nsISmtpService> smtpService =
      do_GetService("@mozilla.org/messengercompose/smtp;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIURI> aUri;
  nsCOMPtr<nsIRequest> aRequest;
  nsCString identEmail;
  m_identity->GetEmail(identEmail);
  smtpService->SendMailMessage(m_file, m_dntRrt.get(), m_identity,
                               identEmail.get(), EmptyString(), this, nullptr,
                               nullptr, false, ""_ns, getter_AddRefs(aUri),
                               getter_AddRefs(aRequest));

  return NS_OK;
}

nsresult nsMsgMdnGenerator::WriteString(const char* str) {
  NS_ENSURE_ARG(str);
  uint32_t len = strlen(str);
  uint32_t wLen = 0;

  return m_outputStream->Write(str, len, &wLen);
}

nsresult nsMsgMdnGenerator::InitAndProcess(bool* needToAskUser) {
  DEBUG_MDN("nsMsgMdnGenerator::InitAndProcess");
  nsresult rv = m_folder->GetServer(getter_AddRefs(m_server));
  nsCOMPtr<nsIMsgAccountManager> accountManager =
      do_GetService("@mozilla.org/messenger/account-manager;1", &rv);
  if (accountManager && m_server) {
    if (!m_identity) {
      // check if this is a message delivered to the global inbox,
      // in which case we find the originating account's identity.
      nsCString accountKey;
      m_headers->ExtractHeader(HEADER_X_MOZILLA_ACCOUNT_KEY, false, accountKey);
      nsCOMPtr<nsIMsgAccount> account;
      if (!accountKey.IsEmpty())
        accountManager->GetAccount(accountKey, getter_AddRefs(account));
      if (account) account->GetIncomingServer(getter_AddRefs(m_server));

      if (m_server) {
        // Find the correct identity based on the "To:" and "Cc:" header
        nsCString mailTo;
        nsCString mailCC;
        m_headers->ExtractHeader(HEADER_TO, true, mailTo);
        m_headers->ExtractHeader(HEADER_CC, true, mailCC);
        nsTArray<RefPtr<nsIMsgIdentity>> servIdentities;
        accountManager->GetIdentitiesForServer(m_server, servIdentities);

        // First check in the "To:" header
        for (auto ident : servIdentities) {
          nsCString identEmail;
          ident->GetEmail(identEmail);
          if (!mailTo.IsEmpty() && !identEmail.IsEmpty() &&
              FindInReadable(identEmail, mailTo,
                             nsCaseInsensitiveCStringComparator)) {
            m_identity = ident;
            break;
          }
        }
        // If no match, check the "Cc:" header
        if (!m_identity) {
          for (auto ident : servIdentities) {
            nsCString identEmail;
            ident->GetEmail(identEmail);
            if (!mailCC.IsEmpty() && !identEmail.IsEmpty() &&
                FindInReadable(identEmail, mailCC,
                               nsCaseInsensitiveCStringComparator)) {
              m_identity = ident;
              break;
            }
          }
        }

        // If still no match, use the first identity
        if (!m_identity) {
          rv = accountManager->GetFirstIdentityForServer(
              m_server, getter_AddRefs(m_identity));
        }
      }
    }
    NS_ENSURE_SUCCESS(rv, rv);

    if (m_identity) {
      bool useCustomPrefs = false;
      m_identity->GetBoolAttribute("use_custom_prefs", &useCustomPrefs);
      if (useCustomPrefs) {
        bool bVal = false;
        m_server->GetBoolValue("mdn_report_enabled", &bVal);
        m_mdnEnabled = bVal;
        m_server->GetIntValue("mdn_not_in_to_cc", &m_notInToCcOp);
        m_server->GetIntValue("mdn_outside_domain", &m_outsideDomainOp);
        m_server->GetIntValue("mdn_other", &m_otherOp);
      } else {
        bool bVal = false;

        nsCOMPtr<nsIPrefBranch> prefBranch(
            do_GetService(NS_PREFSERVICE_CONTRACTID, &rv));
        if (NS_FAILED(rv)) return rv;

        if (prefBranch) {
          prefBranch->GetBoolPref("mail.mdn.report.enabled", &bVal);
          m_mdnEnabled = bVal;
          prefBranch->GetIntPref("mail.mdn.report.not_in_to_cc",
                                 &m_notInToCcOp);
          prefBranch->GetIntPref("mail.mdn.report.outside_domain",
                                 &m_outsideDomainOp);
          prefBranch->GetIntPref("mail.mdn.report.other", &m_otherOp);
        }
      }
    }
  }

  if (m_mdnEnabled) {
    m_headers->ExtractHeader(HEADER_DISPOSITION_NOTIFICATION_TO, false,
                             m_dntRrt);
    if (m_dntRrt.IsEmpty())
      m_headers->ExtractHeader(HEADER_RETURN_RECEIPT_TO, false, m_dntRrt);
    if (!m_dntRrt.IsEmpty() && ProcessSendMode() && ValidateReturnPath()) {
      if (!m_autoSend) {
        *needToAskUser = true;
        rv = NS_OK;
      } else {
        *needToAskUser = false;
        rv = UserAgreed();
      }
    }
  }
  return rv;
}

NS_IMETHODIMP nsMsgMdnGenerator::Process(EDisposeType type,
                                         nsIMsgWindow* aWindow,
                                         nsIMsgFolder* folder, nsMsgKey key,
                                         nsIMimeHeaders* headers,
                                         bool autoAction, bool* _retval) {
  DEBUG_MDN("nsMsgMdnGenerator::Process");
  NS_ENSURE_ARG_POINTER(folder);
  NS_ENSURE_ARG_POINTER(headers);
  NS_ENSURE_ARG_POINTER(aWindow);
  NS_ENSURE_TRUE(key != nsMsgKey_None, NS_ERROR_INVALID_ARG);
  m_disposeType = type;
  m_autoAction = autoAction;
  m_window = aWindow;
  m_folder = folder;
  m_headers = headers;
  m_key = key;

  mozilla::DebugOnly<nsresult> rv = InitAndProcess(_retval);
  NS_ASSERTION(NS_SUCCEEDED(rv), "InitAndProcess failed");
  return NS_OK;
}

NS_IMETHODIMP nsMsgMdnGenerator::UserAgreed() {
  DEBUG_MDN("nsMsgMdnGenerator::UserAgreed");
  (void)NoteMDNRequestHandled();
  return CreateMdnMsg();
}

NS_IMETHODIMP nsMsgMdnGenerator::UserDeclined() {
  DEBUG_MDN("nsMsgMdnGenerator::UserDeclined");
  return NoteMDNRequestHandled();
}

/**
 * Set/clear flags appropriately so we won't ask user again about MDN
 * request for this message.
 */
nsresult nsMsgMdnGenerator::NoteMDNRequestHandled() {
  nsresult rv = StoreMDNSentFlag(m_folder, m_key);
  NS_ASSERTION(NS_SUCCEEDED(rv), "StoreMDNSentFlag failed");
  rv = ClearMDNNeededFlag(m_folder, m_key);
  NS_ASSERTION(NS_SUCCEEDED(rv), "ClearMDNNeededFlag failed");
  return rv;
}

NS_IMETHODIMP nsMsgMdnGenerator::OnStartRunningUrl(nsIURI* url) {
  DEBUG_MDN("nsMsgMdnGenerator::OnStartRunningUrl");
  return NS_OK;
}

NS_IMETHODIMP nsMsgMdnGenerator::OnStopRunningUrl(nsIURI* url,
                                                  nsresult aExitCode) {
  nsresult rv;

  DEBUG_MDN("nsMsgMdnGenerator::OnStopRunningUrl");
  if (m_file) m_file->Remove(false);

  if (NS_SUCCEEDED(aExitCode)) return NS_OK;

  const char* exitString;

  switch (aExitCode) {
    case NS_ERROR_UNKNOWN_HOST:
    case NS_ERROR_UNKNOWN_PROXY_HOST:
      exitString = "smtpSendFailedUnknownServer";
      break;
    case NS_ERROR_CONNECTION_REFUSED:
    case NS_ERROR_PROXY_CONNECTION_REFUSED:
      exitString = "smtpSendRequestRefused";
      break;
    case NS_ERROR_NET_INTERRUPT:
    case NS_ERROR_ABORT:  // we have no proper string for error code
                          // NS_ERROR_ABORT in compose bundle
      exitString = "smtpSendInterrupted";
      break;
    case NS_ERROR_NET_TIMEOUT:
    case NS_ERROR_NET_RESET:
      exitString = "smtpSendTimeout";
      break;
    default:
      exitString = errorStringNameForErrorCode(aExitCode);
      break;
  }

  nsCOMPtr<nsISmtpService> smtpService(
      do_GetService("@mozilla.org/messengercompose/smtp;1", &rv));
  NS_ENSURE_SUCCESS(rv, rv);

  // Get the smtp hostname and format the string.
  nsCString smtpHostName;
  nsCOMPtr<nsISmtpServer> smtpServer;
  rv = smtpService->GetServerByIdentity(m_identity, getter_AddRefs(smtpServer));
  if (NS_SUCCEEDED(rv)) smtpServer->GetHostname(smtpHostName);

  AutoTArray<nsString, 1> params;
  CopyASCIItoUTF16(smtpHostName, *params.AppendElement());

  nsCOMPtr<nsIStringBundle> bundle;
  nsCOMPtr<nsIStringBundleService> bundleService =
      mozilla::components::StringBundle::Service();
  NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);

  rv = bundleService->CreateBundle(
      "chrome://messenger/locale/messengercompose/composeMsgs.properties",
      getter_AddRefs(bundle));
  NS_ENSURE_SUCCESS(rv, rv);

  nsString failed_msg, dialogTitle;

  bundle->FormatStringFromName(exitString, params, failed_msg);
  bundle->GetStringFromName("sendMessageErrorTitle", dialogTitle);

  nsCOMPtr<mozIDOMWindowProxy> domWindow;
  m_window->GetDomWindow(getter_AddRefs(domWindow));

  nsCOMPtr<nsIPromptService> dlgService(
      do_GetService(NS_PROMPTSERVICE_CONTRACTID, &rv));
  NS_ENSURE_SUCCESS(rv, rv);

  dlgService->Alert(domWindow, dialogTitle.get(), failed_msg.get());

  return NS_OK;
}