Add extensible Linkedin login capabilities to a WordPress site.

Robert D Payne

<p>RDP Linkedin Login provides:</p>
<ul>
<li>Login button shortcode – shows a <em>Sign in with LinkedIn</em> button when logged out</li>
<li>Ability to register a visitor with the WordPress installation</li>
<li>Ability to push newly-registered visitor info to another site that is also using RDP Linkedin Login</li>
<li>Ability to display member count for a site</li>
<li>Ability to display the member count from another site that is also using RDP LinkedIn Login</li>
<li>Logged-in session security using nonces and client IP address</li>
<li>OOP with hooks and filters for easy integration and customization</li>
<li>Ability to set an after-login redirect url, by using a custom JavaScript function</li>
<li>Ability to run custom JavaScript code after login, by defining a rdp_ll_login_onClose function</li>
</ul>
<h4>Support</h4>
<p>Posting to the WordPress.org Support Forum does not send me notifications of new issues. Therefore, please send support requests using the <a href="http://www.rdptechsolutions.com/contact/" rel="nofollow ugc">contact form on my web site.</a></p>
<h4>Sponsor</h4>
<p>This plug-in brought to you through the generous funding of <a href="http://www.limsinstitute.org/" rel="nofollow ugc">Laboratory Informatics Institute, Inc.</a></p>
<h3>Usage</h3>
<p>To display a <em>Sign in with LinkedIn</em> button, use the <strong>[rdp-linkedin-login]</strong> shortcode in a widget or page.</p>
<p>To display the member count, add the <strong>[rdp-linkedin-login-member-count]</strong> shortcode to a widget.</p>
<p>It is also possible to display the member count from another site that is also using the RDP LinkedIn Login plugin. Simply use the optional <em>url</em> attribute, by adding <strong>rdpllaction/member_count</strong> to the target domain.</p>
<h4>example:</h4>
<p>[rdp-linkedin-login-member-count url=http://www.example.com/rdpllaction/member_count]</p>
<h3>External Scripts Included</h3>
<ul>
<li>JS Cookie v2.0.4 under MIT License</li>
<li>jQuery.PositionCalculator v1.1.2 under MIT License</li>
</ul>
<h3>Hook Reference:</h3>
<h4>rdp_ll_before_user_login</h4>
<ul>
<li>Param 1: JSON object representing a LinkedIn Person containing firstName, lastName, emailAddress, pictureUrl, id, public-profile-url, location, headline and summary</li>
<li>Param 2: RDP_LL_DATAPASS object</li>
<li>Fires before attempting to register or log-in a user.</li>
</ul>
<h4>rdp_ll_after_insert_user</h4>
<ul>
<li>Param 1: WP_User object</li>
<li>Param 2: JSON object representing a LinkedIn Person containing firstName, lastName, emailAddress, pictureUrl, id, public-profile-url, location, headline and summary</li>
<li>Fires after a new user is registered with the site. <em>(Register New Users? must be enabled)</em></li>
</ul>
<h4>rdp_ll_after_user_push</h4>
<ul>
<li>Param 1: WP User Object</li>
<li>Param 2: JSON object representing a LinkedIn Person containing firstName, lastName, emailAddress, pictureUrl, id, public-profile-url, location, headline and summary</li>
<li>Param 3: Array of results including HTTP headers or WP_Error if the request failed</li>
<li>Fires after a new user’s LinkedIn information is pushed to another site. <em>(Register New Users? must be enabled)</em></li>
</ul>
<h4>rdp_ll_after_registered_user_login</h4>
<ul>
<li>Param: WP User Object</li>
<li>Fires after a registered user is logged into the site. <em>(Register New Users? must be enabled)</em></li>
</ul>
<h4>rdp_ll_registered_user_login_fail</h4>
<ul>
<li>Param: JSON object representing a LinkedIn Person containing firstName, lastName, emailAddress, pictureUrl, id, public-profile-url, location, headline and summary</li>
<li>Fires after a failed attempt to log registered user into the site. <em>(Register New Users? must be enabled)</em></li>
</ul>
<h4>rdp_ll_after_user_login</h4>
<ul>
<li>Param 1: JSON object representing a LinkedIn Person containing firstName, lastName, emailAddress, pictureUrl, id, public-profile-url, location, headline and summary</li>
<li>Param 2: RDP_LL_DATAPASS object</li>
<li>Fires after attempting to register or log-in a user.</li>
</ul>
<h4>rdp_ll_after_scripts_styles</h4>
<ul>
<li>Param: none</li>
<li>Fires after enqueuing plug-in-specific scripts and styles</li>
</ul>
<h3>Filter Reference:</h3>
<h4>rdp_ll_render_login</h4>
<ul>
<li>Param 1: String containing log-in HTML for the <strong>[rdp-ingroups-login]</strong> shortcode</li>
<li>Param 2: String containing status – ‘true’ if user is logged in, ‘false’ otherwise</li>
<li>Return: log-in HTML for the <strong>[rdp-ingroups-login]</strong> shortcode</li>
</ul>
<h4>rdp_ll_before_insert_user</h4>
<ul>
<li>Param 1: WP_User->ID or false if the user ID does not exist in the usermeta table, based on search for LinkedIn user token id and meta_key = _rdp_ll_id</li>
<li>Param 2: JSON object representing a LinkedIn Person containing firstName, lastName, emailAddress, pictureUrl, id, public-profile-url, location, headline and summary</li>
<li>Return: WP_User->ID or false, if the user does not already exist in WordPress</li>
</ul>
<h4>rdp_ll_before_registered_user_login</h4>
<ul>
<li>Param 1: Boolean indicating if user is logged in based on result of WordPress is_user_logged_in() function</li>
<li>Param 2: JSON object representing a LinkedIn Person containing firstName, lastName, emailAddress, pictureUrl, id, public-profile-url, location, headline and summary</li>
<li>Param 3: WP_User->ID or false, if the user does not already exist in WordPress</li>
<li>Return: Boolean indicating if user is logged in</li>
</ul>
<h4>rdp_ll_custom_menu_items</h4>
<ul>
<li>Param 1: Array to hold custom link data</li>
<li>Param 2: String containing status – ‘true’ if user is logged in, ‘false’ otherwise</li>
<li>Return: Array of links, where the link text is the key and the link URL is the value</li>
</ul>
<h4>rdp_ll_actions_submenu</h4>
<ul>
<li>Param: String containing HTML of popup actions menu, which appears after clicking on the picture or name displayed by the plugin, after a person is logged in</li>
<li>Return: String containing HTML of actions menu</li>
</ul>
<h4>rdp_ll_app_scope_filter</h4>
<ul>
<li>Param: String containing default LinkedIn application scopes</li>
<li>Return: String containing LinkedIn application scopes, each separated by a space</li>
</ul>
<h4>rdp_ll_app_profile_parameters_filter</h4>
<ul>
<li>Param: String containing default LinkedIn application profile parameters</li>
<li>Return: String containing LinkedIn application profile parameters</li>
</ul>
<h3>Javascript Function Reference:</h3>
<h4>rdp_ll_login_onClose</h4>
<ul>
<li>Param: redirect URL</li>
<li>Fires upon successful log-in, just before the log-in pop-up window closes.</li>
</ul>
<h3>Redirect Code Example</h3>
<p>In this example, all links with class rdp_jb_must_sign_in are assigned an event listener that sets a cookie, with the cookie value derived from the link’s href attribute. The cookie name should always be rdp_ll_login_redirect.</p>
<p>When the pop-up log-in window executes its close script, the function rdp_ll_login_onClose is called, and it reloads the page to show that the visitor is logged in. In the document.ready() function, the cookie is read, then deleted, and the parent window is redirected to the appropriate URL.</p>
<h4>Example Code of Custom Sign-In JavaScript File</h4>
<pre><code>var $j=jQuery.noConflict();
// Use jQuery via $j(...)

$j(document).ready(rdp_sign_in_onLoad);

function rdp_sign_in_onLoad(){
    var redirectPath = Cookies.get('rdp_ll_login_redirect');
    var loggedIn = $j('body').hasClass('logged-in');
    if(loggedIn && redirectPath && redirectPath != 'undefined'){
        Cookies.remove('rdp_ll_login_redirect', { path: '/' });
        window.location.href = redirectPath;
    }

    $j('#rdp-jb-main').on( "click", '.title.rdp_jb_must_sign_in' , function(event){
        event.preventDefault();  
        var redirectURL = $j(this).attr('href');
        var date = new Date();
        date.setTime(date.getTime()+(30*1000));
        Cookies.set('rdp_ll_login_redirect', redirectURL, {expires: date, path: '/' })
    });
}//rdp_sign_in_onLoad

function rdp_ll_login_onClose(redirect_url){
    window.location.reload();
}//rdp_ll_login_onClose
</code></pre>


RDP Linkedin Login

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