Web Technology Experts Notes

Saturday, 22 February 2014

FireBase Chat
1). Its Free
2). You can integrate with Facebook/Twitter/Github etc
3) You can manage Chat (Can View/Update/Delete)
4) You can export chat in Json Form
5) API Available

Demo: http://firebase.github.io/firechat/

Tutorial: http://firebase.github.io/firechat/docs/

How to setup firebase chat
1) Register to https://www.firebase.com/
2) Login to your firebase account similar to https://blistering-fire-9888.firebaseio.com/
3) Go to Dashboard=>Simple Account
a) Add list of domains where your chat will be run, (for example localhost, www.example.com)
b) Set "Authentication Providers"
Here you can enable provider (Facebook|Twitter etc)
Enable the checkbox and put the required credentials

For facebook
i) Create a app
ii) In Site URL put "https://auth.firebase.com/auth/facebook/callback"
iii) In "Site and Review", Enable the app for public
iv) Copy your "App ID" and "App Secret" from "Settings" and paste in "firebase.com=>Simple Login=>Facebook"

For Twitter
i) Create a App in twitter.com
URL: https://apps.twitter.com/
ii) In Callback URL set " https://auth.firebase.com/auth/twitter/callback"
iii) Copy "API key" and "API secret" from twitter apps and paste in "firebase.com=>Simple Login=>Twitter" (Twitter Consumer Key,Twitter Consumer Secret)

4) Open Below URL's
http://firebase.github.io/firebase-simple-login/
a) Click on "Launch demo" of Facebook Link
b) Click on "Launch demo" of Twitter Link

Wednesday, 22 January 2014

Manage Cron Job with PHP - SSH2 Connection

Today, Cron play very vital role in our website. It reduce the lots of manual work like update the record, Caching the pages, Remove not-required data etc.

Following are use of Cron Job

Update Database records
Copy/Move data from one server to another server
Caching the data for enhance the website performance
Remove the Redundancy data
Remove the un-necessary data.

If there are too-many cron jobs in our web application that its hard to manage the cron jobs through crontabs. Also sometimes Compmay Owner/Manger wants to mange the cron jobs through the Admin Panel.

Here is sample code with use of which you can mange the cron jobs from PHP. Now you can add/update/delete the cron job from PHP.

        /** check ssh2 connection**/
        if (!function_exists("ssh2_connect")){
            die('ssh2 is not installed');
        }
        /** check ssh2 connection**/
        
        if (!($con = ssh2_connect("www.example.com", 22))) {
            echo "Domain Not exist";
        } else {
            // try to authenticate with username root, password secretpassword
            if (!ssh2_auth_password($con, "username", "password")) {
                echo "credentials is In-Correct";
            } else {
                // execute a command
                if (!($stream = ssh2_exec($con, "ls -al"))) {
                    echo "Execution Failed";
                } else {
                    /** Read output */
                    stream_set_blocking($stream, true);
                    $data = "";
                    while ($buf = fread($stream, 4096)) {
                        $data .= $buf;
                    }
                    fclose($stream);
                    
                    echo $data;
                     /** Read output */
                }
            }
        }