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• Hashing and salting values

  - by Avanst

  I am developing a small web app that internally authenticates users. Once the user is authenticated my web app then passes some information such as userID and Person's name to a third party web application. The third party developer is suggesting that we hash and salt the values. Forgive my ignorance, but what exactly does that mean? I am writing the app in Java. So what I am planning on doing is hashing the userID, Person's name, and some Math.random() value as the salt with Apache Commons Digest Utils SHA512 and passing that hashed string along with the userID and person's name. Is that the standard practice? I should be passing the third party the salt as well correct?

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• varnish invalidate url REGEX from backend

  - by ooouuiii

  Say I have some highly-visited front-page, which displays number of some items by categories. When some item is added / deleted I need to invalidate this front-page/url and some 2 others. What is the best practice how to invalidate those urls from backend in Varnish (4.x)? From what I captured, I can: implement my HTTP PURGE handler in VCL configuration file, that "bans" urls matching received regex from backend to Varnish, send 3x HTTP PURGE requests for those 3 urls. But is this approach safe for this automatic usage? Basicly I need to invalidate some views everytime some related entity is inserted/updated/deleted. Can it lead to ban list cumulation and increasing CPU consumption? Is there any other approach? Thanks.

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• MVC Pages that require the user to be logged in

  - by keithjgrant

  I'm working on a little MVC framework and I'm wondering what the "best way" is to structure things so secure pages/controllers always ensure the user is logged in (and thus automatically redirects to a login page--or elsewhere--if not). Obviously, there are a lot of ways to do it, but I'm wondering what solution(s) are the most common or are considered the best practice. Some ideas I had: Explicitly call user->isLoggedIn() at the beginning of your controller action method? (Seems far too easy to forget and leave an important page unsecure on accident) Make your controller extend a secureController that always checks for login in the constructor? Do this check in the model when secure information is requested? (Seems like redundant calls would be made) Something else entirely? Note: I'm working in PHP, though the question is not language-dependent.

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• Date or String declaration in a javabean

  - by Jeff

  Should I declare an attribute in a javabean that holds a date value a user types in on an HTML form as a String or Date? I feel I should declare as a Date, however, since I do server validation on all form data, if the date doesn't validate, when I pass the form bean back to the jsp view for correcting, I lose the date value that the user tried to type in. If I declare as a String, if the date doesn't validate, I'm able to set the string value in the bean and pass the bean back to the view and the user can see what they incorrectly typed. But with a String declaration for Date inputs I forsee problems down the road with my DAO. I want to be able to use a DAO utility which generates a prepare statement using setObject. In my html form I request dates to be mm/dd/yyyy and in DAO i'm using Oracle Date. I can not use hibernate or such, since this is a corporate intranet. What is the best practice "pattern" I should be following??

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• MySQL Full-text Search Workaround for innoDB tables

  - by Rob

  I'm designing an internal web application that uses MySQL as its backend database. The integrity of the data is crucial, so I am using the innoDB engine for its foreign key constraint features. I want to do a full-text search of one type of records, and that is not supported natively with innoDB tables. I'm not willing to move to MyISAM tables due to their lack of foreign key support and due to the fact that their locking is per table, not per row. Would it be bad practice to create a mirrored table of the records I need to search using the MyISAM engine and use that for the full-text search? This way I'm just searching a copy of the data and if anything happens to that data it's not as big of a deal because it can always be re-created. Or is this an awkward way of doing this that should be avoided? Thanks.

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• Do preconditions ALWAYS have to be checked?

  - by Pin

  These days I'm used to checking every single precondition for every function since I got the habit from an OS programming course back at uni. On the other hand, at the software engineering course we were taught that a common precondition should only be checked once, so for example, if a function is delegating to another function, the first function should check them but checking them again in the second one is redundant. I do see the redundancy point, but I certainly feel it's safer to always check them, plus you don't have to keep track of where they were checked previously. What's the best practice here?

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• Rails attribute alias

  - by Dr1Ku

  Hi, I was just wondering if it's possible to "rename" an association in Rails. Let's assume : # An ActiveRecord Class named SomeModelASubModel (some_model_a_sub_model.rb) class SomeModelASubModel < ActiveRecord::Base has_many :some_model_a_sub_model_items end # An ActiveRecord Class named SomeModelASubModelItem (some_model_a_sub_model_item.rb) class SomeModelASubModelItem < ActiveRecord::Base belongs_to :some_model_a_sub_model end At this point, calling some_model.items, where some_model is an instance of the SomeModelASubModel Class would trigger an undefined method error. What is the best practice for making this happen though, e.g. : # With a method_alias or something, would it be possible to : some_model = SomeModelASubModel.first # for instance items = some_model.items # For the reason stated, this doesn't work, one has to call : items = some_model.some_model_a_sub_model_items Is such a shorthand possible ? Thank you in advance !

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• Troubles with NSString writeToFile

  - by Jesse

  Hi everyone, I have been working on a simple text editor in Cocoa/Objective-C for a practice project and I have come across an error that I would never have expected. I have an NSString for my file's contents as well as an NSString for it's path. When I attempt to write the contents to a file, I use the following method: [FileContents writeToFile: CurrentFileName atomically: NO encoding: NSStringEncoding error: nil]; I've used this method many times without error yet today, I am getting an error: "Expected expression before 'NSStringEncoding'" If anyone can help me out with this it would be greatly appreciated. I can't figure out what could be causing the error. Thanks a lot!

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• Creating a folder inside Mac OS App

  - by Negative Zero

  I want a an app that is "self-contained" (I don't know if i use the right word. "putting the app into trash bin will remove everything" is what I meant). But the app requires some resources to run. I usually put those resources into a folder. I want to move those resources into the App folder ( package contents). Can I do that? Is it a good practice to do that? When I test the app directly running from Xcode, the App runs fine. But if i run it from finder, the app will say fails to create resources folder because permission denied. I checked the app's folder permission - User(me) has read/write access. I am wondering what is causing this different behavior. The last option is to use Application Support folder, but I don't want to leave trails when user deletes the app. Can someone help me out here?

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• Disable update on battery percentage

  - by Kris B

  I have a service that performs background updates. I want to give the user the the option to disable the updates when their battery percentage reaches a certain level. From my research, I'm going to use a receiver in the onCreate method of my Service class, eg: public class MainService extends Service { @Override public void onCreate() { this.registerReceiver(this.BatInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); } private BroadcastReceiver BatInfoReceiver = new BroadcastReceiver(){ @Override public void onReceive(Context arg0, Intent intent) { int level = intent.getIntExtra("level", 0); } }; } I'm assuming the best practice is to leave the service running and check the battery level in the service and not perform the CPU intensive code based on the percentage? I don't actually stop the service itself and start it up again, based on the battery percentage?

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• Caching in Ruby Gem, possibly not using Rails

  - by corprew

  I am rewriting an existing Ruby Gem to include caching. This is for a gem that is relatively commonly used, and accesses a large amount of static data on a web service. Currently, I have a small number of gem users doing a large number of accesses to the service that under normal conditions would be swamping / downing the service, and we're going to put the gem up on github for general consumption. Right now, users can choose between using the rails cache mechanism, a simple disk cache, or no cache. What is best practice for letting people choose what cache to use like this (being able to use this outside of rails is a priority so i can't just bail to the underlying caching mechanism)? I'm looking for suggestions/examples for configuration and interface, especially. Thanks for your suggestions

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• Why operator= returns reference not const reference

  - by outmind

  The original question is related to overloading operator= and I like to share my findings as it was nontrivial for me to find them. I cannot imagine reasonable example to use (a=b) as lvalue. With the help of IRC and google I've found the next article: http://msdn.microsoft.com/en-us/magazine/cc301415.aspx it provides two examples. (a=b)=c f(T& ); f(a=b) but both a bit not good, as first violate associativity and I believe that it is bad practice. The second one give me the same feeling. Could you provide more good examples why it should be non constant?

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• Unique number identifier generation

  - by xwrs

  I have to create logic for generation unique number identifier for records in database. id, generated in database is a separate column. At this moment, when user calls "create record" action, I save new record, get its database id, generate record number using this id, then put it to the edit form. Using this way means that all entity fields should be nullable to save record to database. I don't like this way. I know that should be better way. Is there a better practice to generate unique number identifier? What is possibility of generating non-unique random numbers? Thank you

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• Best practices to test protected methods with PHPUnit

  - by GrGr

  Hello, I found the discussion on Do you test private method informative. I have decided, that in some classes, I want to have protected methods, but test them. Some of these methods are static and short. Because most of the public methods make use of them, I will probably be able to safely remove the tests later. But for starting with a TDD approach and avoid debugging, I really want to test them. I thought of the following: Method Object as adviced in an answer seems to be overkill for this. Start with public methods and when code coverage is given by higher level tests, turn them protected and remove the tests. Inherit a class with a testable interface making protected methods public Which is best practice? Is there anything else? It seems, that JUnit automatically changes protected methods to be public, but I did not have a deeper look at it. PHP does not allow this via reflection.

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• Third Party Libraries and Technologies every Java Programmer must be aware of?

  - by kunjaan

  I agree that this is a very subjective question but as a student of Java , I get suggested good libraries and technologies for Java by my mentors at work. For example, I was not aware of Google Guice for Dependency Injection, awesomeness of Java Reflection APIs, ORMs like Hibernate or stuffs you could do with libraries like Hadoop. I want to collect and share some of the libraries that exemplifies good java programming (so that beginners like me could code walk and emulate the coding practice), teach unique concepts to Java (for example Dependency Injections or ORM) and/or are really interesting libraries that a student like me would get to do interesting projects on (eg. Hadoop). I redited this question 3 times to make it more specific : ). I am sorry if I am really not clear in my intentions. But some kind of a list of good concepts and third party libraries for Java could really help some of my intern friends here at work. Thank you.

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• Selenium testing with checksums (md5)

  - by Peter

  I am new at selenium testing and am writing a bunch of tests for a webpage that relies heavily on javascript user interaction. At first I wrote a lot of assertions of the style If I press button A" then assert number of visible rows = x, assert checkboxes checked are such assert title = bar .... [20 more] and so on. Then I switched to checksumming the HTML using MD5: If I press button A" then assert md5(html) = 8548bccac94e35d9836f1fec0da8115c. And it made my life a whole lot easier... But is this a bad practice in any way?

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• Rails associations of user/post/comment

  - by garthcn

  Hi, I'm trying to create an app like a blog, with 3 models: user, post and comment. As expected, a comment belongs to both a user and a post. I used the following associations: User.rb has_many :comments has_many :posts Post.rb has_many :comments belongs_to :user Comment.rb belongs_to :user belongs_to :post And I tried to create comments using: @user.comments.create However, this will relate the comment with user, but not with post. I want the comment to be associated wit BOTH user and post. Is there a way to do so? Or did I use the wrong associations? I think it might be a bad practice to set the user_id or post_id by hand, so both ids are not in attr_accessible. I'm not sure if it is correct. Thank you!

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• Optimal way to store and pass a date to Javascript

  - by user1493115

  I need to store a date-time value in MySQL and subsequently display it on a webpage. Due to its flexibility I usually chose to store a Unix timestamp in the database and convert it with PHP's date() to the desired format. This time however I would like to use MySQL's datetime field (mostly due to 2038) and apply the browser's timezone (hence I cannot simply format it on the server and pass the string to the client). I thought of storing the date as UTC datetime in the database and send it as well-defined format to the client, where it will be further processed. Here I would like to avoid a Unix timestamp but everything else might add additional overhead in processing. Is there any best practice as far as date processing is concerned in a MySQL, PHP, JQuery environment? Thanks.

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• How to change the value of progressbar in C#?

  - by shekhar

  Hi, I want to add an progress bar into my C# based application. I would like to know what is the good way of updating its value at particular events? My problem is, I have single function in UI which does all the processing.This function in turn calls many more functions, creates objects, updates database, etc. (basically performs all the work) and returns values in an output file. I have access to that function only. So in this how to update the progressbar's value at the end of each step? What is the best practice for this kind of situation? What is the good way to keep UI logic and business logic seperate? I want to avoid writting progressbar related code in my library code. Please suggest some solution. Thanks and Regards,

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• Good assembly tutorial for windows with eiter fasm or nasm

  - by The new guy

  I have spent the last 3 hours google and bing for a good asm tutorial(x86 variety). I have been on this site for many of these results. Non have really been sufficient. Mainly because while i like learning theory, i learn it best via practice, while for example pc-asm has about 20-30 pages of theroy before anything practical. I was wondering if there was a tutorial or online pdf (or cheap book(<£20)) that i could use that suits my style of learning. Please state if this is not possibke Thank you for your time

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• AS3: Performance question calling an event function with null param

  - by adehaas

  Lately I needed to call a listener function without an actual listener like so: foo(null); private function foo(event:Event):void { //do something } So I was wondering if there is a significant difference regarding performance between this and using the following, in which I can prevent the null in calling the function without the listener, but am still able to call it with a listener as well: foo(); private function foo(event:Event = null):void { } I am not sure wether it is just a question of style, or actually bad practice and I should write two similar functions, one with and one without the event param (which seems cumbersome to me). Looking forward to your opinions, thx.

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• Understanding flow of object creation

  - by Boris Mandovskes

  I'm new to java and I wonder if there is simple way to know flow like the following of object creation, I'm using eclipse and when I write new ObjectInputStream and press CTRL+SPACE. I don't see any option that I can enter new BufferedInputStream (I have copied the code from example) and than to create new object for FileInputStream etc. in = new ObjectInputStream(new BufferedInputStream(new FileInputStream("emp.dat"))); List temp = (List)in.readObject(); I give that example since this is the first time that I saw this kind of creation new object flow and I want to use some best practice for the next times.

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• Which one is better to have auto-implemented property with private setter or private field and property just getter?

  - by PLB

  My question may be a part of an old topic - "properties vs fields". I have situation where variable is read-only for outside class but needs to modified inside a class. I can approach it in 2 ways: First: private Type m_Field; public Type MyProperty { get { return m_Field; } } Second: public Type MyProperty { get; private set; } After reading several articles (that mostly covered benefits of using public properties instead of public fields) I did not get idea if the second method has some advantage over the first one but writing less code. I am interested which one will be better practice to use in projects (and why) or it's just a personal choice. Maybe this question does not belong to SO so I apologize in advance.

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• Is it always bad idea to use inline css for used-once property?

  - by user93422

  I have a table, with 10 columns. I want to control the width of each column. Each column is unique, right now I create an external CSS style for each column: div#my-page table#members th.name-col { width: 40px; } I know there is a best practice to avoid inline style. I do approve using external CSS for anything look'n'feel related: fonts, colors, images. But is it really better to use external CSS in this case? It does not incur extra maintenance cost. It is easier to produce. Cons I can think of: If you have separate designers and development team - using inline styles will force designers to modify content-file (aspx in my case). It might use more bandwidth. Anything else I've missed?

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• Does jQuery.on() work for elements that are added after the event handler is created?

  - by orokusaki

  I was under the impression all this time that .on() worked like .live() with regards to dynamically created elements (e.g. I use $('.foo').on('click', function(){alert('click')}); and then an element with the class foo is created due to some AJAX, now I'm expecting a click on that element to cause an alert). In practice, these weren't the results I got. I could be making a mistake, but could somebody help me understand the new way to achieve these results, in the wake of .on()? Thanks in advance.

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