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The Big Programming Thread - Page 912

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Thread Rules
1. This is not a "do my homework for me" thread. If you have specific questions, ask, but don't post an assignment or homework problem and expect an exact solution.
2. No recruiting for your cockamamie projects (you won't replace facebook with 3 dudes you found on the internet and $20)
3. If you can't articulate why a language is bad, don't start slinging shit about it. Just remember that nothing is worse than making CSS IE6 compatible.
4. Use [code] tags to format code blocks.
Hanh
Profile Joined June 2016
146 Posts
October 25 2017 09:48 GMT
#18221
On October 25 2017 16:30 Silvanel wrote:
Show nested quote +
On October 25 2017 04:16 Acrofales wrote:
Don't use PyQT, but seems this is relevant: https://stackoverflow.com/questions/33736819/pyqt-no-error-msg-traceback-on-exit

Have you tried just putting your entire script between try catch and printing the exception and callback? Reading this seems like PyQT treats this as a last resource if the exception isn't being handled, and exits with an information-less error code.


Yeah i found this also. I think i will try to run line by line and if that doesnt help try override sys.execpthook. Still there is number provided in that exit process message (its 0 for example if application finish without errors), so i wondered if anyone knows what 3 stands for in my example, thats probably some group of errors. Knowning that could probably help me a lot.


If I remember correctly, 3 is the return code from abort() on Windows. On Linux, you would get another value. In any case, that's just the program unwinding the exception and not finding any handler.
Silvanel
Profile Blog Joined March 2003
Poland4725 Posts
October 25 2017 10:07 GMT
#18222
Thank You i looked in https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx and it says 0x03 is actualy ERROR_PATH_NOT_FOUND which makes sense in regards to my application. Will look into it.
Pathetic Greta hater.
R1CH
Profile Blog Joined May 2007
Netherlands10340 Posts
October 25 2017 10:28 GMT
#18223
Exit codes are process dependent so you can't infer much from an exit status of 3. Error codes are different, eg if you CreateFile an invalid path you'll get error 3 (PATH_NOT_FOUND) in Win32, but this is a Win32 API specific thing.
AdministratorTwitter: @R1CH_TL
LG)Sabbath
Profile Blog Joined July 2005
Argentina3022 Posts
October 25 2017 11:12 GMT
#18224
On October 25 2017 13:59 Manit0u wrote:
Show nested quote +
On October 24 2017 08:52 LG)Sabbath wrote:
On October 16 2017 18:14 Manit0u wrote:
https://api-platform.com/

Fucken amazing!

https://github.com/docker/dockercraft

This is too much...

After reading the intro, still not sure what that framework is like. The intro is basically a docker-compose + doctrine tutorial.


It's pretty much Symfony in API-only mode

Ah, I was hoping for something new. Every PHP framework seems to be based on Symfony lately. :/
https://www.twitch.tv/argsabbath/
Hanh
Profile Joined June 2016
146 Posts
October 25 2017 11:14 GMT
#18225
On October 25 2017 19:07 Silvanel wrote:
Thank You i looked in https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx and it says 0x03 is actualy ERROR_PATH_NOT_FOUND which makes sense in regards to my application. Will look into it.


Check out https://msdn.microsoft.com/en-us/library/aa272002(v=vs.60).aspx


abort does not return control to the calling process. By default, it terminates the current process and returns an exit code of 3.

Manit0u
Profile Blog Joined August 2004
Poland17244 Posts
October 25 2017 15:17 GMT
#18226
On October 25 2017 20:12 LG)Sabbath wrote:
Show nested quote +
On October 25 2017 13:59 Manit0u wrote:
On October 24 2017 08:52 LG)Sabbath wrote:
On October 16 2017 18:14 Manit0u wrote:
https://api-platform.com/

Fucken amazing!

https://github.com/docker/dockercraft

This is too much...

After reading the intro, still not sure what that framework is like. The intro is basically a docker-compose + doctrine tutorial.


It's pretty much Symfony in API-only mode

Ah, I was hoping for something new. Every PHP framework seems to be based on Symfony lately. :/


That's because Symfony is pretty much the standard library for PHP nowadays. Everything is using it (even Zend).
Time is precious. Waste it wisely.
WarSame
Profile Blog Joined February 2010
Canada1950 Posts
October 26 2017 23:00 GMT
#18227
In Java, particularly Android, is it a good idea to log on entering an exiting a method for current and future traceability?
Can it be I stayed away too long? Did you miss these rhymes while I was gone?
Manit0u
Profile Blog Joined August 2004
Poland17244 Posts
October 26 2017 23:29 GMT
#18228
On October 27 2017 08:00 WarSame wrote:
In Java, particularly Android, is it a good idea to log on entering an exiting a method for current and future traceability?


In every situation it depends on how much logs it will generate. Especially on mobile devices, where storage space is at a premium.
Time is precious. Waste it wisely.
Hanh
Profile Joined June 2016
146 Posts
October 27 2017 01:06 GMT
#18229
On October 27 2017 08:00 WarSame wrote:
In Java, particularly Android, is it a good idea to log on entering an exiting a method for current and future traceability?


In Java, it is better to leave it for later by using aspects.
Silvanel
Profile Blog Joined March 2003
Poland4725 Posts
Last Edited: 2017-10-27 08:36:44
October 27 2017 08:36 GMT
#18230
If someone is still intrested in my problem it turned out that if run my app directly from windows console the python traceback is there. Only if i use some kind of IDE (tried PyCharm and IDLE but from what i heared it is also the case for Eclipse and others) the traceback is gone.
So right now i am developing in PyCharm and testing in console.
Pathetic Greta hater.
Blisse
Profile Blog Joined July 2010
Canada3710 Posts
October 27 2017 09:37 GMT
#18231
On October 27 2017 08:00 WarSame wrote:
In Java, particularly Android, is it a good idea to log on entering an exiting a method for current and future traceability?


No. Just write well-structured code with good tests. Assert your preconditions when it's not explicit, and throw instead of swallowing errors.
There is no one like you in the universe.
Manit0u
Profile Blog Joined August 2004
Poland17244 Posts
October 27 2017 12:48 GMT
#18232
On October 27 2017 17:36 Silvanel wrote:
If someone is still intrested in my problem it turned out that if run my app directly from windows console the python traceback is there. Only if i use some kind of IDE (tried PyCharm and IDLE but from what i heared it is also the case for Eclipse and others) the traceback is gone.
So right now i am developing in PyCharm and testing in console.


You know of course that you can launch console inside PyCharm?

I've always got my console open in jetbrains IDEs.
Time is precious. Waste it wisely.
Manit0u
Profile Blog Joined August 2004
Poland17244 Posts
Last Edited: 2017-10-27 14:28:02
October 27 2017 12:54 GMT
#18233
Do you guys think there's a more elegant way to write this stuff?


class PropertyValidator < ActiveModel::Validator
def validate(record)
attributes = record.property_attributes_info

attributes.each do |properties_attribute, definitions_attribute|
@properties = {}
@errors = []

next if skip_validation?(record[properties_attribute], record[definitions_attribute])

@properties = record[properties_attribute]

validate_properties(record[definitions_attribute])

next if @errors.empty?

record.errors.add(properties_attribute, @errors)
end
end

private

def skip_validation?(properties, definitions)
properties.blank? || definitions.blank?
end

def validate_properties(definitions)
@properties.each do |property_name, property_value|
validate_property(property_name, property_value, definitions[property_name])
end
end

def validate_property(property_name, property_value, definition)
return @errors << "#{property_name} has no definition" if definition.blank?

check_type(property_name, property_value, definition[:type_of_value])
check_allowed_values(property_name, property_value, definition[:options])
check_constraints(property_name, definition[:options])
end

def check_type(property_name, property_value, type)
return if type_valid?(property_value, type)

@errors << "#{property_name}: #{property_value} is not a #{type}"
end

def check_allowed_values(property_name, property_value, options)
return if options.blank? || options[:allowed_values].blank?
return if value_allowed?(property_value, options[:allowed_values])

@errors << "#{property_name}: #{property_value} is not allowed"
end

def check_constraints(property_name, options)
return if options.blank? || options[:constraints].blank?
return if constraints_met?(options[:constraints])

@errors << "#{property_name}: does not meet constraints"
end

def type_valid?(value, type)
case type
when 'string'
value.is_a?(String)
when 'integer'
value.is_a?(Integer)
when 'float'
value.is_a?(Float)
when 'boolean'
value.is_a?(Boolean)
else
raise "Unknown property type \"#{type}\""
end
end

def value_allowed?(value, allowed)
case allowed[:type]
when 'range'
(allowed[:min]..allowed[:max]).include?(value)
when 'array'
allowed[:values].include?(value)
else
raise "Unknown allowed values type \"#{allowed[:type]}\""
end
end

def constraints_met?(constraints)
case constraints[:kind]
when 'other_property_equals'
constraints[:property_values].include?(@properties[constraints[:property_name]])
when 'and'
all_constraints_pass?(constraints)
when 'or'
any_constraints_pass?(constraints)
else
@errors << "Unknown constraint kind \"#{constraints[:kind]}\""
end
end

def all_constraints_pass?(constraints)
constraints[:constraints].each do |constraint|
return false unless constraints_met?(constraint)
end

true
end

def any_constraints_pass?(constraints)
constraints[:constraints].each do |constraint|
return true if constraints_met?(constraint)
end

false
end
end


I know it doesn't have any docs for now, but it's basically a form of custom DSL that I'm figuring out as I go (will add comments in the code later on) but I'm so far gone in wrapping my head around it that I've lost all perspective.

Is this code understandable enough if you look at it from the outside?

Edit:

Context for this is that I need to parse JSON and then validate some fields in it based on preconditions. This way an external application can pass me constraints like (a && (b && (c || d))) and each one of them can have similar nested constraints so I have to parse them recursively.
Time is precious. Waste it wisely.
WarSame
Profile Blog Joined February 2010
Canada1950 Posts
October 27 2017 16:24 GMT
#18234
For my login system I hash user's passwords and check it against a DB. Is it a bad idea to have a field in my User class that is my password hash in a byte array? Is that vulnerable to anything?
Can it be I stayed away too long? Did you miss these rhymes while I was gone?
Biolunar
Profile Joined February 2012
Germany224 Posts
October 27 2017 16:28 GMT
#18235
On October 28 2017 01:24 WarSame wrote:
For my login system I hash user's passwords and check it against a DB. Is it a bad idea to have a field in my User class that is my password hash in a byte array? Is that vulnerable to anything?

Yes. You need to add a salt to the data or the password can be found with a rainbow table. Also make sure you use a good hashing algorithm (NOT MD5 or SHA1 please).
What is best? To crush the Zerg, see them driven before you, and hear the lamentations of the Protoss.
WarSame
Profile Blog Joined February 2010
Canada1950 Posts
October 27 2017 17:05 GMT
#18236
My database is on the phone, so they can't use a rainbow table against it I think. I was thinking more of concerns surrounding passing the hashed value around.

Also, I'm using SHA-256, so I should be fine on that end.
Can it be I stayed away too long? Did you miss these rhymes while I was gone?
Blitzkrieg0
Profile Blog Joined August 2010
United States13132 Posts
Last Edited: 2017-10-27 17:41:25
October 27 2017 17:40 GMT
#18237
On October 28 2017 02:05 WarSame wrote:
My database is on the phone, so they can't use a rainbow table against it I think. I was thinking more of concerns surrounding passing the hashed value around.

Also, I'm using SHA-256, so I should be fine on that end.


The database being on your phone doesn't protect you against a rainbow table. If you have a million users and you hash all the passwords then you're going to have a bunch of duplicate entries in your database as anyone with the same password will have an identical entry after the hash. You add the salt so that each of those will hash to a different value and if an adversary brute forces one password they don't have everyone else's password who was using that same value.

Salts protect the collective. They're useless if the adversary is brute forcing one password. The rainbow table is just a list of what common passwords hash to with various algorithms. By utilizing a salt the adversary has to generate a rainbow table for every salt instead of having a master copy.
I'll always be your shadow and veil your eyes from states of ain soph aur.
WarSame
Profile Blog Joined February 2010
Canada1950 Posts
October 27 2017 21:03 GMT
#18238
As far as I understand it the database is on each phone, so they would have to have access to millions of phones with this app, their hashed passwords, and password hints. I agree salting is a good idea, but I don't think it is necessary in this case. Anyway, this is beside the question I was asking, which is whether passing around an object with a password hash field is vulnerable to anything if all the data stays inside the app. Could someone get the value? If they get the value could they log in with it somehow?
Can it be I stayed away too long? Did you miss these rhymes while I was gone?
Blisse
Profile Blog Joined July 2010
Canada3710 Posts
October 27 2017 21:07 GMT
#18239
If it's just passing around the password as a string parameter then it's fine.

If the password is persisted in any way then no.

"data stays inside the app" means lots of things. Just because data is saved to app storage doesn't mean malicious users can't easily access the data.
There is no one like you in the universe.
tofucake
Profile Blog Joined October 2009
Hyrule19031 Posts
October 27 2017 21:12 GMT
#18240
salting the hash costs next to nothing and is far more secure than not.

you not wanting to salt means you either don't care (bad), don't think it matters (bad), don't want to do it because you don't understand salt (bad, but not as bad as the others), or "need" every possible byte of storage you can get for some other reason (bad)

tl;dr just fucking salt the password
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