The Tor Browser: widget/gtk/nsPSPrinters.cpp@ac0c01689b40

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* ex: set tabstop=8 softtabstop=4 shiftwidth=4 expandtab: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "nscore.h"

     8 #include "nsCUPSShim.h"

     9 #include "nsIServiceManager.h"

    10 #include "nsPSPrinters.h"

    11 #include "nsReadableUtils.h"        // StringBeginsWith()

    12 #include "nsCUPSShim.h"

    13 #include "mozilla/Preferences.h"

    15 #include "prlink.h"

    16 #include "prenv.h"

    17 #include "plstr.h"

    19 using namespace mozilla;

    21 #define NS_CUPS_PRINTER "CUPS/"

    22 #define NS_CUPS_PRINTER_LEN (sizeof(NS_CUPS_PRINTER) - 1)

    24 /* dummy printer name for the gfx/src/ps driver */

    25 #define NS_POSTSCRIPT_DRIVER_NAME "PostScript/"

    27 nsCUPSShim gCupsShim;

    29 nsPSPrinterList::nsPSPrinterList()

    30 {

    31     // Should we try cups?

    32     if (Preferences::GetBool("print.postscript.cups.enabled", true) &&

    33         !gCupsShim.IsInitialized()) {

    34         gCupsShim.Init();

    35     }

    36 }

    39 /* Check whether the PostScript module has been disabled at runtime */

    40 bool

    41 nsPSPrinterList::Enabled()

    42 {

    43     const char *val = PR_GetEnv("MOZILLA_POSTSCRIPT_ENABLED");

    44     if (val && (val[0] == '0' || !PL_strcasecmp(val, "false")))

    45         return false;

    47     // is the PS module enabled?

    48     return Preferences::GetBool("print.postscript.enabled", true);

    49 }

    52 /* Fetch a list of printers handled by the PostsScript module */

    53 void

    54 nsPSPrinterList::GetPrinterList(nsTArray<nsCString>& aList)

    55 {

    56     aList.Clear();

    58     // Query CUPS for a printer list. The default printer goes to the

    59     // head of the output list; others are appended.

    60     if (gCupsShim.IsInitialized()) {

    61         cups_dest_t *dests;

    63         int num_dests = (gCupsShim.mCupsGetDests)(&dests);

    64         if (num_dests) {

    65             for (int i = 0; i < num_dests; i++) {

    66                 nsAutoCString fullName(NS_CUPS_PRINTER);

    67                 fullName.Append(dests[i].name);

    68                 if (dests[i].instance != nullptr) {

    69                     fullName.Append("/");

    70                     fullName.Append(dests[i].instance);

    71                 }

    72                 if (dests[i].is_default)

    73                     aList.InsertElementAt(0, fullName);

    74                 else

    75                     aList.AppendElement(fullName);

    76             }

    77         }

    78         (gCupsShim.mCupsFreeDests)(num_dests, dests);

    79     }

    81     // Build the "classic" list of printers -- those accessed by running

    82     // an opaque command. This list always contains a printer named "default".

    83     // In addition, we look for either an environment variable

    84     // MOZILLA_POSTSCRIPT_PRINTER_LIST or a preference setting

    85     // print.printer_list, which contains a space-separated list of printer

    86     // names.

    87     aList.AppendElement(

    88             NS_LITERAL_CSTRING(NS_POSTSCRIPT_DRIVER_NAME "default"));

    90     nsAutoCString list(PR_GetEnv("MOZILLA_POSTSCRIPT_PRINTER_LIST"));

    91     if (list.IsEmpty()) {

    92         list = Preferences::GetCString("print.printer_list");

    93     }

    94     if (!list.IsEmpty()) {

    95         // For each printer (except "default" which was already added),

    96         // construct a string "PostScript/<name>" and append it to the list.

    97         char *state;

    99         for (char *name = PL_strtok_r(list.BeginWriting(), " ", &state);

   100                 nullptr != name;

   101                 name = PL_strtok_r(nullptr, " ", &state)

   102         ) {

   103             if (0 != strcmp(name, "default")) {

   104                 nsAutoCString fullName(NS_POSTSCRIPT_DRIVER_NAME);

   105                 fullName.Append(name);

   106                 aList.AppendElement(fullName);

   107             }

   108         }

   109     }

   110 }

   113 /* Identify the printer type */

   114 nsPSPrinterList::PrinterType

   115 nsPSPrinterList::GetPrinterType(const nsACString& aName)

   116 {

   117     if (StringBeginsWith(aName, NS_LITERAL_CSTRING(NS_POSTSCRIPT_DRIVER_NAME)))

   118         return kTypePS;

   119     else if (StringBeginsWith(aName, NS_LITERAL_CSTRING(NS_CUPS_PRINTER)))

   120         return kTypeCUPS;

   121     else

   122         return kTypeUnknown;

   123 }

The Tor Browser / file revision

widget/gtk/nsPSPrinters.cpp@ac0c01689b40

widget/gtk/nsPSPrinters.cpp