ResumeCreator
ResumeCreator is a OS X application that i wrote and submitted to the App store. It can be found here. This page works as a support page for the application.
Concurrency in Objective-C using Grand Central Dispatch (GCD)
To demonstrate execution of concurrent Objective-C code, I wrote this simple example below. The two functions you have to read about to understand the code are; dispatch_get_global_queue and dispatch_async.
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#import <Foundation/Foundation.h> int main(int argc, const char * argv[]) { @autoreleasepool { // 1. Get the handle of the system's predefined global concurrent queue, DISPATCH_QUEUE_PRIORITY_DEFAULT. dispatch_queue_t dispatchQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); // 2. Enqueue the code to be run asynchronously, to the queue above. dispatch_async(dispatchQueue, ^{ for(int i = 1; i <= 10; i++) { usleep(1000000); NSLog(@"Inside the dispatch async: %d", i); } }); // 3. Lets run the same code on the main thread just to see what will happen. for(int i = 1; i <= 10; i++) { usleep(1000000); NSLog(@"Outside the dispatch async: %d", i); } return 0; } } |
Example of output you may get, may look like this.… Continue Reading
TDD and JavaScript
I felt that I had to do this for my own good.:) To do TDD, the easiest way is to have nodeJS installed and up and running. What I shortly did is to create my project skeleton
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$ mkdir first_project |
Then, you… Continue Reading
Writing a wrapper WebSocket client class in JS
I released this custom WebSocketChatServer gem earlier this month and thought that it may be a good idea to wrap the server’s client in a JS class just to make it easier to communicate with the server. Here is the… Continue Reading
Getting started with PostgreSQL’s PL/PGSQL
Relational database management system (RDBMS) are more than creating tables and execute SQL-queries against them. PostgreSQL is one of my favourite RDBMS and if you happened to use it in the back end, I suggest that you should look at… Continue Reading
Encrypt text in iPhone & decrypt it in your Rails server
What I did to perform the task is that i used RNCryptor in my IOS application.
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+(NSString*) encryptString:(NSString*) stringToEncrypt withKey:(NSString*) encryptionKey{ NSData *data = [stringToEncrypt dataUsingEncoding:NSUTF8StringEncoding]; NSError *error; NSData *encryptedData = [RNEncryptor encryptData:data withSettings:kRNCryptorAES256Settings password:encryptionKey error:&error]; return [encryptedData base64EncodedStringWithOptions:0]; } |
And I engaged this gem to do the decryption in Rails.
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require 'ruby_rncryptor' require "base64" def decrypt_string(encrypted_string, secret_key) encrypted = Base64.decode64(encrypted_string) RubyRNCryptor.decrypt(encrypted, secret_key) end |
Parsing an URL with Ruby
Can not be easier than this…
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require 'uri' parsed_uri = URI.parse('http://localhost:3000/welcome/index') puts parsed_data.scheme # => http puts parsed_data.host # => localhost puts parsed_data.port # => 3000 puts parsed_data.path # => /welcome/index |
Prevent CSRF-attacks in your PHP files using tokens
If you do not know how a CSRF-attack work, read here This is a simple class for taking care of generating and validating the tokens.
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<?php /** * A Session token creator class */ class SessionToken { /** * Holds the session token name * @var string */ private $_tokenName; /** * Class constructor * @param string $tokenName The name of the token to be stored in the session */ public function __construct($tokenName = ""){ if(empty($tokenName)) { throw new \Exception("The token name is empty."); } if (session_id() == "") { throw new \Exception("The session is not started."); } $this->_tokenName = $tokenName; } /** * Creates a new token by storing it in the session * @return string the newly created token */ public function createToken() { $tokenValue = substr(md5(rand()), 0, 7); $_SESSION["$this->_tokenName"] = $tokenValue; return $tokenValue; } /** * Checks if the token is valid or not * @param string $tokenValue The token validate * @return boolean true if the token is valid, otherwise false */ public function isValidToken($tokenValue = "") { if(!isset($_SESSION["$this->_tokenName"])) return false; $sessionTokenValue = $_SESSION["$this->_tokenName"]; if($sessionTokenValue != $tokenValue) return false; return true; } } |
Let’s say that you have login.php in which a form with two text fields… Continue Reading
Filter pattern in Rails
Imagine you have an User < ActiveRecord::Base object and you want to apply filtering implementation to it. The filtering will be based on certain criteria like get me all the adult users or all the users that are females or… Continue Reading
Observer pattern exemplified in Ruby
The observer design pattern is best demonstrated using the broadcaster listener example. A broadcaster in this example is an object having implementation for attaching listeners to itself. When the broadcaster will broadcast a new message, all the attached listeners are… Continue Reading