JavaScript class encaptulation

My favorite JavaScript class structure –

(function(exports) {
	"use strict";
	var mySuperDupparClassOfSHKR=function(pValue){
	var myPrivateValue;
	this.setValue=function(pValue){
		myPrivateValue=pValue;
		return this;
	};
	var __construct = function(that, pValue) {
		return that.setValue(pValue);
		}(this, pValue);
	};
	exports.SuperDupparClass = {
		create : function(pValue) {
			if(typeof pValue==='undefined') throw 'please provide a value, unable to continue...';
			return new mySuperDupparClassOfSHKR(pValue);
		},
	};
})(this);

Usage as follows –

var myObj;
jQuery(document).ready(function($) {
	try{
		myObj=SuperDupparClass.create('any value');
	}catch(e){
		alert('ERR: '+e);
	}
});

 

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PHP Archive (.phar) Attaching with ZF2

PHP archive aka phar is a stream wrapper which can serve any packaged PHP library efficiently.

To create a phar document for a library (not for web output or for cli executable) is simple as pie like –

$phar = new \Phar('target-location-where-to-save.phar', 
 FilesystemIterator::CURRENT_AS_FILEINFO |
 FilesystemIterator::KEY_AS_FILENAME, 'optionalPharAliasName');
$phar->buildFromDirectory('source/lib/path');

After creating phar document, file can use to attach ZF2 standard autoloader as follows –

Zend\Loader\AutoloaderFactory::factory(array(
 'Zend\Loader\StandardAutoloader' => array(
   'autoregister_zf' => true,
   'namespaces' => array(
          'YourProjectNamespace'=>'phar:///absolute/path/of/project/phar/file.phar',
        ),
     ),
   ));

This works as simple folder of your file system. Easily distributable, packaged.

PHP Debug efficiently with debug_backtrace

Hello today I write a small function for debug your PHP code. Its simple but powerful –

 $bkTrace=function ($stack) {
 $output = '';
 
 $stackLen = count($stack);
 for ($i = 1; $i < $stackLen; $i++) {
 $entry = $stack[$i];
 
 $func = (array_key_exists('class', $entry)?$entry['class'].'\\':'').$entry['function'] . '(';
 $argsLen = count($entry['args']);
 for ($j = 0; $j < $argsLen; $j++) {
 $my_entry = $entry['args'][$j];
 if (is_string($my_entry)) {
 $func .= $my_entry;
 }
 if ($j < $argsLen - 1) $func .= ', ';
 }
 $func .= ')';
 
 $entry_file = 'NO_FILE';
 if (array_key_exists('file', $entry)) {
 $entry_file = $entry['file'];
 }
 $entry_line = 'NO_LINE';
 if (array_key_exists('line', $entry)) {
 $entry_line = $entry['line'];
 }
 $output .= $entry_file . ':' . $entry_line . ' - ' . $func . PHP_EOL;
 }
 return $output;
 };
 echo '<pre>'.$bkTrace(debug_backtrace()); exit();

Image size for social media (like facebook, twitter, google+, linkedin, pinterest, instagram, youtube) profile and other picture

As we faced many problem to work in social media about size of profile picture to use. Here is the dimension that analysis by renowned email marketing tools provider constant contact. Also I add some value to enrich the list –

Facebook
————————
Cover photo 815×315
Profile photo 180×180 (display area 160×160)
Fan page profile photo 200×200 (display area 176×176)
Tab 111×74
Link Image 1200×627
Image 1200×1200
Highlighted/milestone image 1200×717

Twitter
———————–
Header 1500×500
Profile photo 400×400
Image display size 880×440 (recommended)

Google+
—————————
Profile photo 250×250
Cover photo 2120×1192
Shared image 800×600

LinkedIn
————————-
Profile photo 200×200
Cover photo 646×220

Pinterest
————————–
Profile photo 600×600
Pins 600xINFINITE
Board thumbnail 222×150

Instagram
————————
Profile photo 161×161
Image viewed on desktop in lightbox as 612×612
Image feed 510×510

YouTube
—————————
Profile photo 800×800
Channel art 2560×1224
Custom video thumbnail 1280×720

* all dimensions listed in pixels

Hope it may help you to engineering the web for your client.

Batch file that will create skeleton directories of ZF2

After a long time write a batch file to create a skeleton directory for Zend Framework 2 module. Hope it may help someone who work in windows 7 OS

@echo off
@setlocal ENABLEDELAYEDEXPANSION
@rem this file will create required empty directory of a ZF2 module
@rem author Shahadat Hossain Khan (shahadathossain.com)
ECHO.
IF "%~1"=="" GOTO noModuleName
SET modName=%~1
CALL :UCase %modName% _UCMN
CALL :LCase %modName% _LCMN
IF NOT EXIST "%_UCMN%" (
 MKDIR %_UCMN%
 MKDIR %_UCMN%\config
 MKDIR %_UCMN%\src
 MKDIR %_UCMN%\src\%_UCMN%
 MKDIR %_UCMN%\src\%_UCMN%\Controller
 MKDIR %_UCMN%\src\%_UCMN%\Form
 MKDIR %_UCMN%\src\%_UCMN%\Model
 MKDIR %_UCMN%\view\
 MKDIR %_UCMN%\view\%_LCMN%
 MKDIR %_UCMN%\view\%_LCMN%\%_LCMN%
 ECHO Directory created. Named - %modName%
) else (
 ECHO Directory already exist!
) 
GOTO:EOF
:noModuleName
ECHO You must provide module name along with this command as 1st argument
GOTO:EOF


:LCase
:UCase
:: Syntax: CALL :UCase _VAR1 _VAR2
:: Syntax: CALL :LCase _VAR1 _VAR2
:: _VAR1 = Variable NAME whose VALUE is to be converted to upper/lower case
:: _VAR2 = NAME of variable to hold the converted value
:: Note: Use variable NAMES in the CALL, not values (pass "by reference")
set varX=%1
set frstChar=%varX:~0,1%
set rstChar=%varX:~1%
FOR %%Z IN (Aa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Ss Tt Uu Vv Ww Xx 
Yy Zz) DO (
 SET pX=%%Z
 set c1=!pX:~0,1!
 set c2=!pX:~1,1!
 IF /I "%0"==":UCase" (
 if %frstChar%==!c1! SET _Abet=!c1!
 if %frstChar%==!c2! SET _Abet=!c1!
 )
 IF /I "%0"==":LCase" (
 if %frstChar%==!c1! SET _Abet=!c2!
 if %frstChar%==!c2! SET _Abet=!c2!
 )
)
SET _Word_Rtrn=%_Abet%%rstChar%
SET %2=%_Word_Rtrn%
GOTO:EOF


endlocal

Usage

<your batch file name> <the module name>

Install Zend Framework 2 into Windows IIS

This article will show you how you can install Zend Framework 2 into your windows OS without composer.phar help.

1. Download latest stable copy of ZF2 from http://framework.zend.com/downloads/latest and unpack, we call it ZF2

2. Download latest stable copy of ZF2 skeleton app from https://github.com/zendframework/ZendSkeletonApplication/ and unpack, we call it ZF2Skeleton

3. Create folder like <ZF2Skeleton folder>/vendor/ZF2. Now copy ZF2/* into <ZF2Skeleton folder>/vendor/ZF2 And the final directory structure may look like following image (for ZF2 version 2.3.1 dated 20140426)

zf2 basic folder structure

4. Now point any domain into “public” folder. e.g. zf2.localhost.tld

  • 4.a. Open notepad as administrator user
  • 4.b. Add an entry to your hosts (file) like – “127.0.0.1 zf2.localhost.tld” [one host in each line]
    • 4.b.1 hosts file is typically located at C:\WINDOWS\system32\drivers\etc\hosts
  • 4.c Now save the hosts file and close
  • 4.d. Now create an entry in your IIS (6 or 7 both are same procedure) by following http://support.microsoft.com/kb/816576 with the above host name i.e. zf2.localhost.tld

5. Now you need to fix ZF2_PATH or $zf2Path variable at “/init_autoloader.php” file of root to point our “/vendor/ZF2” folder

Find following code:

$zf2Path = false;
if (getenv(‘ZF2_PATH’)) { // Support for ZF2_PATH environment variable
$zf2Path = getenv(‘ZF2_PATH’);
} elseif (get_cfg_var(‘zf2_path’)) { // Support for zf2_path directive value
$zf2Path = get_cfg_var(‘zf2_path’);
}

Replace by following code:

define(‘DS’, DIRECTORY_SEPARATOR);
define(‘APP_ROOT_PATH’, dirname(__FILE__).DS);
$zf2Path = false;
if (is_dir(APP_ROOT_PATH.’vendor’.DS.’ZF2′.DS.’library’)) {
$zf2Path = APP_ROOT_PATH.’vendor’.DS.’ZF2′.DS.’library’;
} elseif (getenv(‘ZF2_PATH’)) { // Support for ZF2_PATH environment variable or git submodule
$zf2Path = getenv(‘ZF2_PATH’);
} elseif (get_cfg_var(‘zf2_path’)) { // Support for zf2_path directive value
$zf2Path = get_cfg_var(‘zf2_path’);
}

You can now visit zf2.localhost.tld to get your expected site.

Please note, you must run latest copy of PHP (at least bigger then 5.3.23 when I write this article there I found version 5.3.28 stable for windows non thread safe version installer for download) from http://windows.php.net/download/

Now the problem is URL route in IIS. That means when you lookup into ZF2 getting started docs you may find some code to edit .htaccess of apache. What about IIS in this case?

IIS have solution of URL rewrite problem. Visit www.iis.net/urlrewrite to get the latest copy of the plugin to attach into your IIS installation. Just install this addon/plugin/extension/demon/program whatever name you called.

After installation you need a file web.config into your “<ZF2Skeleton folder>/public” folder. No matter, here we do a small trick. Just download Drupal 7+ core from https://drupal.org/project/drupal and unpack it. There you found a web.config file at root path. Just copy and paste that file into your <ZF2Skeleton folder>/public folder.

That’s all folk!

ckeditor installation into drupal with imce

As a professional app developer, I faced to install ckeditor into drupal many times. Each times I need to dig again and again to its working. So, now I think I have to write it down that will help me and others too 😉

Install ckeditor into Drupal with IMCE

Its simple two step > Download & Put it into right place, Configure & use.

Download & Put it into right place

1. Download Drupal module of ckeditor from https://drupal.org/project/ckeditor
2. Download Drupal module for IMCE from https://drupal.org/project/imce
3. Put those module into “sites/all/modules” folder or where you think appropriate
4. Now download full version of ckeditor from http://ckeditor.com/download
5. Put full version of ckeditor into “<path where you put your ckeditor drupal module>/” please visit http://docs.cksource.com/CKEditor_for_Drupal/Open_Source/Drupal_7/Installation for details instruction where to put

That’s it, you are done the first step

Configure & use

Now enable that two module from your Drupal control panel.

1. Fix permission for ckeditor
2. Configure IMCE
3. Configure text format – Administration > Configuration > Content authoring > Text formats
3.a) For Advanced Html >> enable filter “limit allowed html tags” and leave it as it is or put “<a> <p> <div> <h1> <h2> <h3> <img> <hr> <br> <br /> <ul> <ol> <li> <dl> <dt> <dd> <em> <b> <u> <i> <strong> <del> <ins> <sub> <sup> <quote> <blockquote> <pre>” allowed or as your requirement
3.b) For Full Html >> enable filter “limit allowed html tags” and put “<a> <abbr> <acronym> <address> <area> <article> <aside> <audio> <b> <bdo> <bgsound> <big> <blockquote> <br> <br /> <button> <canvas> <caption> <center> <cite> <code> <col> <colgroup> <command> <datalist> <dd> <del> <details> <dfn> <div> <dl> <dt> <em> <fieldset> <figcaption> <figure> <font> <footer> <form> <h1> <h2> <h3> <h4> <h5> <h6> <header> <hgroup> <hr> <hr /> <i> <img> <input> <ins> <kbd> <keygen> <label> <legend> <li> <link> <map> <mark> <marquee> <menu> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <rp> <rt> <samp> <section> <select> <small> <source> <span> <strong> <sub> <summary> <sup> <table> <tbody> <td> <textarea> <tfoot> <th> <thead> <time> <tr> <tt> <ul> <var> <video> <wbr>” allowed or define tag to allow as your requirement
4. Now configure ckeditor. Specially for file browser settings. Point it to IMCE. Please configure both profile (Full, Advanced)

That’s it. nJoy….

pure-ftpd status error – pure-config.pl dead but subsys locked

I’m experienced to install VSFTPd and I’m using it for 2/3 years. But for a recent project I need to setup a test linux box and there I install pure-ftpd for test purpose. Its easy to install but when I start the server I face a problem. I’ll tell you that story, but before that story I want to share the experience install pure-ftpd in my linux box.

Everything goes fine with out any problem. I always try to install from source i.e. make and install. And always try to install into default directory if there has no security issue. In this case to install pure-ftpd every thing goes fine as usual. Install complete! Now how can I start the server that I just installed…..?????? Actually in latest version (1.0.29) there has no init script installed. So, I can’t start pure-ftpd by service command!!! So, I search the net, here and there but didn’t find a init script that I can use. So, I decide to make it by myself. For that I go to source directory for getting the default path of the installed program. Owo!!! thats I found the init script. Thanks the pure-ftpd team. But you should write instruction so that our time may saved. So, finally I copy it to “init.d” and started server. Server starting normally. And now the problem arised!!!!!

When I try to get the status of pure-ftpd server for monitoring purpose. It shows following message –

pure-config.pl dead but subsys locked

Ohh, I didn’t mention yet! I use “pure-config.pl” script to start my server. Now, when I get this status message I was worried that I fail to setup properly and start googling on this error. Sad, they all point the wrong direction! Anyway, after 12 hour of searching I realize that it’s not a common problem. Its may be a small mistake that can’t get run pure-ftpd. So, I start to find the problem internally. I find that my server is running well. And I’m able to do ftp through it!!!

Finally, I start digging the init script and perl script for the problem. And find that in init script there has line which checking the status of “pure-config.pl” not pure-ftpd daemon!!! So, I just change to check the status of pure-ftpd instead checking status of “pure-config.pl”.

Actually, what happened there when I try to get status? My init script geting status of pure-config.pl and find that the script is run and not active. But the sub-sys (i.e. pure-ftpd) that start by the script is still running. So, its show status like that!!! And its really confusing, specially for the user of my kind who don’t know linux at all.

Apache (httpd) 403 errors & SELinux in RHLE5

The “targeted” policy confines certain network daemons to run in their own specific “security domain”. These daemons include dhcpd, httpd (apache), named, nscd, ntpd, portmap, snmpd, squid, and syslogd.

When I setup apache on a system where it wil be utilized, I have a habit of not using /var/www/html as my starting point for document roots, but rather create a dir at /home/websites and place my document roots in there. In the good ol’ days of Discretionary Access Controls (DAC) just making sure that apache had the perms it needed to read the documents in there was enough (using chmod, chown, and the like).

Not so with SELinux enabled. In addition to the regular DAC we’re all used to, we now have Mandatory Access Controls (MAC) that define security contexts for files/directories etc. Turns out it looks like by default, apache only has access to /var/www/html when it’s fired up…. I’m guessing that and probably /var/log/httpd (which is exactly as it should be). To enable apache to view my files in /home/websites, I had to apply a new security context to these files. The answer to this is the chcon command. To be brief, the full command I executed was:

chcon -R -t httpd_sys_content_t /home/websites

After executing this, apache could read my files.

I like where this SELinux thing is going. Permissions done right, for sure. This doesn’t come with out growing pains though. It’s complex (or so it seems to me after only working with it for a couple days) and will take some time to learn. I’m prepared for some frustration….

Now many of you are probably asking yourself why would anyone (let alone me) want to bother with this? Well I think a simple example of one of the cool things is that even though something like /etc/passwd has DAC octal perms of 644 (rw-r–r–), apache still can’t read it because that file is not with in apache’s security context. So any users on your system can’t write a little script that reads your /etc/passwd file and basically posts it on a web page for the world to see (giving potential crackers a list of valid user accounts on the system).

Actually this is a little bit extra security that provide by SELinux e.g. Security Enhanced!

Ohh, one more tips to change the direcotry live…

chcon --reference=/var/www <your website directory>
chcon --reference=/var/www/html <your public_html directory>

I suggest you to make a shell script to put it together… with following commands…

useradd <your website user name> #password and other necessary staff to point home directory
chmod --reference=/var/www /home/<your website user name>
mkdir /home/<your website user name>/public_html
# most probably the following line need not to execute
chmod --reference=/var/www/html /home/<your website user name>/public_html
# then do other necessary staff for your website suppose add virtual host, ftp user, database user etc.

nJoy…