[Interest] QML preprocessing

Jérôme Godbout godboutj at amotus.ca
Wed Apr 24 21:38:31 CEST 2019

You could copy your file and replace the console.log() with a regex and then use this file version. You will need to add a target to your .pro. Here a quick example of something I do for my i18n target:

i18nTarget.target = $${AMOTUS_ROOT}/i18n
i18nTarget.depends = FORCE
i18nTarget.commands = QMAKE_MKDIR_CMD($${AMOTUS_ROOT}/i18n)

You will need to define your own command here and run that command before make, more info can be found over here: https://doc.qt.io/qt-5/qmake-advanced-usage.html

-----Original Message-----
From: Interest <interest-bounces at qt-project.org> On Behalf Of Konstantin Tokarev
Sent: April 24, 2019 3:09 PM
To: Alexander Ivash <elderorb at gmail.com>; interestqt-project.org <interest at qt-project.org>
Subject: Re: [Interest] QML preprocessing

24.04.2019, 22:01, "Alexander Ivash" <elderorb at gmail.com>:
> What I really need is some 'plugin' to qmake which would allow to 
> modify qml files on the fly before placing it into resources (but not 
> touching them on filesystem!). In ideal world, yeah.

That's possible to do with qmake already, but you'll have to build resource files manually via custom targets

> ср, 24 апр. 2019 г. в 21:51, Alexander Ivash <elderorb at gmail.com>:
>>  2Jerome:
>>  The issue is that even if that function will be doing nothing, 
>> logging
>>  data (which might be sensitive) can be captured via hooks / dump
>>  analysis etc. I really need to pre-processes to eliminate not only
>>  function call but also function parameters completely. Think about
>>  this scenario:
>>  console.debug('password: ',
>>  someFunctionWhichReturnsPasswordFromProtectedStorage());

You can wrap this whole expression into function and replace that function with empty one:

function printPasswordToDebug() {
  console.debug('password: ', someFunctionWhichReturnsPasswordFromProtectedStorage());

and replace printPasswordToDebug

>>  In this case even if console.debug will be replaced with empty
>>  function, 'someFunctionWhichReturnsPasswordFromProtectedStorage()'
>>  will be executed anyway and as the result password will appear
>>  somewhere in JS heap so after capturing dump it will be simpler to
>>  find it.
>>  2Tomasz:
>>  In fact I would love to use logging category, but only for debug
>>  builds. But I have some requirements to minimize risk of sensitive
>>  data leak via logging. And to make a life of reverse engineers a bit
>>  more complicated if you like. So ideally no logging-related 
>> functions
>>  (and their parameters too!) should be visible in release build.
>>  ср, 24 апр. 2019 г. в 21:27, Jérôme Godbout <godboutj at amotus.ca>:
>>  >
>>  > Maybe you can overload the functor directly into the code and import the file only if in debug mode (optional module):
>>  > http://udidu.blogspot.com/2012/12/override-console-functions.html
>>  >
>>  > That could also be helpful to split the log into multiple receiver.
>>  >
>>  > Not sure if this would work, but maybe you can override the console.log command into the QQmlScriptEngine and define a new javascript function that does nothing. Maybe into the your main.cpp where you create the QQmlEngine you can call the rootContext() QQmlContext object, maybe you can extract the console object with QVariant contextProperty() and set the debug() property of it with a QQmlExpression, I cannot glue all this together, but maybe something into that direction could be done before you start loading the main qml file. This is far fetched by might work but it seem overcomplicated to me.
>>  >
>>  > -----Original Message-----
>>  > From: Interest <interest-bounces at qt-project.org> On Behalf Of 
>> Alexander Ivash
>>  > Sent: April 24, 2019 12:56 PM
>>  > To: interestqt-project.org <interest at qt-project.org>
>>  > Subject: [Interest] QML preprocessing
>>  >
>>  > I understand that this topic was raised a lot of times and that this is not QML-way. But, what options do I have in case of requirements to eliminate all the logging for release builds?
>>  >
>>  > Is there any hidden magic in qmake, like 'QMAKE_SUBSTITUTES' but more flexible to substitute all the 'console.debug....' with '// console.debug' right before adding qml into resources?
>>  >
>>  > p.s. Yea, I'm aware of selectors, but would like to avoid having 
>> both component-with-logging.qml and component-with-no-logging.qml
>>  >
>>  > Regards, Alexander
>>  > _______________________________________________
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