Big Question.
So, first, to keep the galleries separate, it would be good to give them their own custom post type. We’ll be checking for this later…
<?php
add_action( 'init', 'wpse32840_register_post_type' );
function wpse32840_register_post_type()
{
register_post_type(
'client_gallery',
array(
'label' => __( 'Client Galleries' ), // probably needs better lables
'public' => true, // allow people to see this on the front end
'exclude_from_search' => true, // cant be brought up via a search
'show_in_nav_menus' => false, // not in nav menus (we'll do this manually)
'rewrite' => array( 'slug' => 'gallery' )
)
);
}
To create gallery for each user, hook into user_register and insert a new client_gallery post. Then set a usermeta value with the post ID. We can use this later for a lot of stuff. It’s also more reliable than checking for the author or the post slug, etc.
<?php
add_action( 'user_register', 'wpse32840_capture_register' );
function wpse32840_capture_register( $user_id )
{
$userobj = get_user_by( 'id', $user_id );
$gallery_id = wp_insert_post(
array(
'post_type' => 'client_gallery',
'post_title' => sprintf( '%s gallery', $userobj->user_login )
),
true
);
if( is_wp_error( $gallery_id ) ) $gallery_id = 0;
update_user_meta( $user_id, 'wpse32840_gallery_id', absint( $gallery_id ) );
}
You should also be able to change the gallery from the admin area, so hook into edit_user_profile to add a dropdown to change the user’s gallery. Also hook into edit_user_profile_update to save the new ID if it’s updated.
<?php
add_action( 'edit_user_profile', 'wpse32840_user_profile' );
function wpse32840_user_profile( $user )
{
$gallery_id = get_user_meta( $user->ID, 'wpse32840_gallery_id', true );
// get all of our galleries!
$galleries = get_posts(
array(
'post_type' => 'client_gallery',
'numberposts' => -1,
'post_status' => 'any'
)
);
// no galleries? bail.
if( ! $galleries ) return;
// nonce
wp_nonce_field( 'wpse32840_nonce', 'wpse32840_nonce', false );
// our fields
echo '<h3>' . __( 'Gallery' ) . '</h3>';
echo '<select name="wpse32840_gallery">';
echo '<option ' . selected( $gallery_id, 0, false ). ' value="0">No gallery</option>';
foreach( $galleries as $g )
{
echo '<option ' . selected( $gallery_id, $g->ID, false ) . ' value="' . absint( $g->ID ) . '">' . esc_html( $g->post_title ) . '</option>';
}
echo '</select>';
}
/**
* Save the user's gallery ID from the user edit page.
*/
add_action( 'edit_user_profile_update', 'wpse32840_save_user' );
function wpse32840_save_user( $user_id )
{
if( ! isset( $_POST['wpse32840_nonce'] ) || ! wp_verify_nonce( $_POST['wpse32840_nonce'], 'wpse32840_nonce' ) )
return;
if( ! isset( $_POST['wpse32840_gallery' ] ) )
return;
update_user_meta( $user_id, 'wpse32840_gallery_id', absint( $_POST['wpse32840_gallery'] ) );
}
Next up, hook into template_redirect and stop normal users from visiting these client_gallery pages. This is also where you can get the current user and their corresponding gallery. If the post you’re viewing doesn’t match up with their gallery, throw them back to the home page.
<?php
add_action( 'template_redirect', 'wpse32840_check_user' );
function wpse32840_check_user()
{
// not on a client gallery? bail
if( ! is_singular( 'client_gallery' ) ) return;
// is the is an admin?
if( current_user_can( 'manage_options' ) ) return;
// thrown non logged in users back to the home page
if( ! is_user_logged_in() )
{
wp_redirect( home_url(), 302 );
exit();
}
$user = wp_get_current_user();
$gallery_id = get_queried_object_id();
// if the user isn't an admin or isn't assigned this gallery, send them back to the home page
if( $gallery_id != get_user_meta( $user->ID, 'wpse32840_gallery_id', true ) )
{
wp_redirect( home_url(), 302 );
exit();
}
// By here, the user is authenticated, let them continue on their merry way.
}
And, finally, what you really wanted to know!
Lastly, you can hook into wp_nav_menu_items to change the output of a given menu. This is a very simple example, only returning a home link and the gallery link if the user is logged in. You can build your own menu for logged in users here or keep it simple.
<?php
add_filter( 'wp_nav_menu_items', 'wpse32840_filter_nav', 10, 2 );
function wpse32840_filter_nav( $items, $args )
{
/**
* you can check for theme location here via $args... check to see if this is the main nav
* in twenty eleven, we can check to see if this is the "primary" menu
* Other thigns will be different. If we're not in the primary menu, bail
*/
if( 'primary' != $args->theme_location ) return $menu;
// Not logged in? return the menu
if( ! is_user_logged_in() ) return $items;
// if this is an admin, return the menu unaltered.
if( current_user_can( 'manage_options' ) ) return $items;
// our user is logged in an not an admin, build them a new menu
// get our current user
$user = wp_get_current_user();
// get the users gallery
$gallery_id = get_user_meta( $user->ID, 'wpse32840_gallery_id', true );
$gallery = get_post( absint( $gallery_id ) );
$items="<li class="menu-item"><a href="" . esc_url( home_url() ) . '">Home</a></li>';
$items .= '<li class="menu-item"><a href="' . esc_url( get_permalink( $gallery ) ) . '">Gallery</a></li>';
return $items;
}
Here’s that whole mess as a plugin.