gnu-social/actions/subscribe.php

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PHP
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<?php
class SubscribeAction extends Action {
function handle($args) {
parent::handle($args);
if (!common_logged_in()) {
common_user_error(_t('Not logged in.'));
return;
}
$other_nickname = $this->arg('subscribeto');
$other = User::staticGet('nickname', $other_nickname);
if (!$other) {
common_user_error(_t('No such user.'));
return;
}
$user = common_current_user();
if ($user->isSubscribed($other)) {
common_user_error(_t('Already subscribed!.'));
return;
}
$sub = new Subscription();
$sub->subscriber = $user->id;
$sub->subscribed = $other->id;
$sub->created = time();
if (!$sub->insert()) {
common_server_error(_t('Couldn\'t create subscription.'));
return;
}
common_redirect(common_local_url('all', array('nickname' =>
$user->nickname)));
}
}