path: root/mod/like.php

<?php

require_once('include/security.php');
require_once('include/bbcode.php');
require_once('include/items.php');


function like_content(&$a) {

	$o = '';

	$observer = $a->get_observer();
	$interactive = $_REQUEST['interactive'];
	if($interactive) {
		$o .= '<h1>' . t('Like/Dislike') . '</h1>';
		$o .= EOL . EOL;

		if(! $observer) {
			$_SESSION['return_url'] = $a->query_string;
			$o .= t('This action is restricted to members.') . EOL;
			$o .= t('Please <a href="rmagic">login with your $Projectname ID</a> or <a href="register">register as a new $Projectname member</a> to continue.') . EOL;
			return $o;
		}
	}

	$verb = notags(trim($_GET['verb']));

	if(! $verb)
		$verb = 'like';

	switch($verb) {
		case 'like':
		case 'unlike':
			$activity = ACTIVITY_LIKE;
			break;
		case 'dislike':
		case 'undislike':
			$activity = ACTIVITY_DISLIKE;
			break;
		case 'agree':
		case 'unagree':
			$activity = ACTIVITY_AGREE;
			break;
		case 'disagree':
		case 'undisagree':
			$activity = ACTIVITY_DISAGREE;
			break;
		case 'abstain':
		case 'unabstain':
			$activity = ACTIVITY_ABSTAIN;
			break;
		case 'attendyes':
		case 'unattendyes':
			$activity = ACTIVITY_ATTEND;
			break;
		case 'attendno':
		case 'unattendno':
			$activity = ACTIVITY_ATTENDNO;
			break;
		case 'attendmaybe':
		case 'unattendmaybe':
			$activity = ACTIVITY_ATTENDMAYBE;
			break;
		default:
			return;
			break;
	}

	$extended_like = false;
	$object = $target = null;
	$post_type = '';
	$objtype = '';

	if(argc() == 3) {

		if(! $observer)
			killme();

		$extended_like = true;
		$obj_type = argv(1);
		$obj_id = argv(2);
		$public = true;

		if($obj_type == 'profile') {
			$r = q("select * from profile where profile_guid = '%s' limit 1",
				dbesc(argv(2))
			);
			if(! $r)
				killme();			
			$owner_uid = $r[0]['uid'];
			if($r[0]['is_default'])
				$public = true;
			if(! $public) {
				$d = q("select abook_xchan from abook where abook_profile = '%s' and abook_channel = %d",
					dbesc($r[0]['profile_guid']),
					intval($owner_uid)
				);
				if(! $d) {
					// forgery - illegal
					if($interactive) {
						notice( t('Invalid request.') . EOL);
						return $o;
					}
					killme();
				}
				// $d now contains a list of those who can see this profile - only send the status notification
				// to them.
				$allow_cid = $allow_gid = $deny_cid = $deny_gid = '';
				foreach($d as $dd) {
					$allow_cid .= '<' . $dd['abook_xchan'] . '>';
				}
			}
			$post_type = t('channel');
			$objtype = ACTIVITY_OBJ_PROFILE;

			$profile = $r[0];
		}
		elseif($obj_type == 'thing') {

			$r = q("select * from obj where obj_type = %d and obj_obj = '%s' limit 1",
            	intval(TERM_OBJ_THING),
            	dbesc(argv(2))
        	);

			if(! $r) {
				if($interactive) {
					notice( t('Invalid request.') . EOL);
					return $o;
				}
				killme();		
			}

			$owner_uid = $r[0]['obj_channel'];

			$allow_cid = $r[0]['allow_cid'];
			$allow_gid = $r[0]['allow_gid'];
			$deny_cid = $r[0]['deny_cid'];
			$deny_gid = $r[0]['deny_gid'];
			if($allow_cid || $allow_gid || $deny_cid || $deny_gid)			
				$public = false;

			$post_type = t('thing');
			$objtype = ACTIVITY_OBJ_PROFILE;
			$tgttype = ACTIVITY_OBJ_THING;

			$links   = array();
			$links[] = array('rel' => 'alternate', 'type' => 'text/html',
				'href' => z_root() . '/thing/' . $r[0]['obj_obj']);
			if($r[0]['imgurl'])	
				$links[] = array('rel' => 'photo', 'href' => $r[0]['obj_imgurl']);

			$target = json_encode(array(
				'type'  => $tgttype,
				'title' => $r[0]['obj_term'],
				'id'    => z_root() . '/thing/' . $r[0]['obj_obj'],
				'link'  => $links
			));

			$plink = '[zrl=' . z_root() . '/thing/' . $r[0]['obj_obj'] . ']' . $r[0]['obj_term'] . '[/zrl]';

		}
		
		if(! ($owner_uid && $r)) {
			if($interactive) {
				notice( t('Invalid request.') . EOL);
				return $o;
			}
			killme();
		}

		// The resultant activity is going to be a wall-to-wall post, so make sure this is allowed

		$perms = get_all_perms($owner_uid,$observer['xchan_hash']);

		if(! ($perms['post_like'] && $perms['view_profile'])) {
			if($interactive) {
				notice( t('Permission denied.') . EOL);
				return $o;
			}
			killme();
		}

		$ch = q("select * from channel left join xchan on channel_hash = xchan_hash where channel_id = %d limit 1",
			intval($owner_uid)
		);
		if(! $ch) {
			if($interactive) {
				notice( t('Channel unavailable.') . EOL);
				return $o;
			}
			killme();
		}
			
		if(! $plink)
			$plink = '[zrl=' . z_root() . '/profile/' . $ch[0]['channel_address'] . ']' . $post_type . '[/zrl]';
	
		$links   = array();
		$links[] = array('rel' => 'alternate', 'type' => 'text/html',
			'href' => z_root() . '/profile/' . $ch[0]['channel_address']);
		$links[] = array('rel' => 'photo', 'type' => $ch[0]['xchan_photo_mimetype'],
			'href' => $ch[0]['xchan_photo_l']);

		$object = json_encode(array(
			'type'  => ACTIVITY_OBJ_PROFILE,
			'title' => $ch[0]['channel_name'],
			'id'    => $ch[0]['xchan_url'] . '/' . $ch[0]['xchan_hash'],
			'link'  => $links
		));


		// second like of the same thing is "undo" for the first like

		$z = q("select * from likes where channel_id = %d and liker = '%s' and verb = '%s' and target_type = '%s' and target_id = '%s' limit 1",
			intval($ch[0]['channel_id']),
			dbesc($observer['xchan_hash']),
			dbesc($activity),
			dbesc(($tgttype)?$tgttype:$objtype),
			dbesc($obj_id)
		);

		if($z) {
			$z[0]['deleted'] = 1;
			build_sync_packet($ch[0]['channel_id'],array('likes' => $z));

			q("delete from likes where id = %d limit 1",
				intval($z[0]['id'])
			);
			if($z[0]['i_mid']) {
				$r = q("select id from item where mid = '%s' and uid = %d limit 1",
					dbesc($z[0]['i_mid']),
					intval($ch[0]['channel_id'])
				);
				if($r)
					drop_item($r[0]['id'],false);
				if($interactive) {
					notice( t('Previous action reversed.') . EOL);
					return $o;
				}
			}
			killme();
		}
	}
	else {

		// this is used to like an item or comment

		$item_id = ((argc() == 2) ? notags(trim(argv(1))) : 0);

		logger('like: verb ' . $verb . ' item ' . $item_id, LOGGER_DEBUG);

		// get the item. Allow linked photos (which are normally hidden) to be liked

		$r = q("SELECT * FROM item WHERE id = %d 
			and item_type = 0 and item_deleted = 0 and item_unpublished = 0 
			and item_delayed = 0 and item_pending_remove = 0 and item_blocked = 0 LIMIT 1",
			intval($item_id)
		);

		if(! $item_id || (! $r)) {
			logger('like: no item ' . $item_id);
			killme();
		}


		$item = $r[0];
		$owner_uid = $item['uid'];
		$owner_aid = $item['aid'];


		$sys = get_sys_channel();


		// if this is a "discover" item, (item['uid'] is the sys channel),
		// fallback to the item comment policy, which should've been
		// respected when generating the conversation thread.
		// Even if the activity is rejected by the item owner, it should still get attached
		// to the local discover conversation on this site. 

		if(($owner_uid != $sys['channel_id']) && (! perm_is_allowed($owner_uid,$observer['xchan_hash'],'post_comments'))) {
			notice( t('Permission denied') . EOL);
			killme();
		}

		$r = q("select * from xchan where xchan_hash = '%s' limit 1",
			dbesc($item['owner_xchan'])
		);
		if($r)
			$thread_owner = $r[0];
		else
			killme();

		$r = q("select * from xchan where xchan_hash = '%s' limit 1",
			dbesc($item['author_xchan'])
		);
		if($r)
			$item_author = $r[0];
		else
			killme();

		
		$verbs = " '".dbesc($activity)."' ";
		$multi_undo = 0;		

		// event participation and consensus items are essentially radio toggles. If you make a subsequent choice,
		// we need to eradicate your first choice. 

		if($activity === ACTIVITY_ATTEND || $activity === ACTIVITY_ATTENDNO || $activity === ACTIVITY_ATTENDMAYBE) {
			$verbs = " '" . dbesc(ACTIVITY_ATTEND) . "','" . dbesc(ACTIVITY_ATTENDNO) . "','" . dbesc(ACTIVITY_ATTENDMAYBE) . "' ";
			$multi_undo = 1;
		}
		if($activity === ACTIVITY_AGREE || $activity === ACTIVITY_DISAGREE || $activity === ACTIVITY_ABSTAIN) {
			$verbs = " '" . dbesc(ACTIVITY_AGREE) . "','" . dbesc(ACTIVITY_DISAGREE) . "','" . dbesc(ACTIVITY_ABSTAIN) . "' ";
			$multi_undo = 1;
		}

		$item_normal = item_normal();

		$r = q("SELECT id, parent, uid, verb FROM item WHERE verb in ( $verbs ) $item_normal
			AND author_xchan = '%s' AND ( parent = %d OR thr_parent = '%s') and uid = %d ",
			dbesc($observer['xchan_hash']),
			intval($item_id),
			dbesc($item['mid']),
			intval($owner_uid)
		);

		if($r) {
			// already liked it. Drop that item.
			require_once('include/items.php');
			foreach($r as $rr) {
				drop_item($rr['id'],false,DROPITEM_PHASE1);
				// set the changed timestamp on the parent so we'll see the update without a page reload
				$z = q("update item set changed = '%s' where id = %d and uid = %d",
					dbesc(datetime_convert()),
					intval($rr['parent']),
					intval($rr['uid'])
				);
				// Prior activity was a duplicate of the one we're submitting, just undo it; 
				// don't fall through and create another
				if(activity_match($rr['verb'],$activity))
					$multi_undo = false;
			}

			if($interactive)
				return;

			if(! $multi_undo)
				killme();
		}
	}

	$mid = item_message_id();

	$arr = array();

	if($extended_like) {
		$arr['item_thread_top'] = 1;
		$arr['item_origin'] = 1;
		$arr['item_wall'] = 1;
	}
	else {
		$post_type = (($item['resource_type'] === 'photo') ? t('photo') : t('status'));
		if($item['obj_type'] === ACTIVITY_OBJ_EVENT)
			$post_type = t('event');

		$links = array(array('rel' => 'alternate','type' => 'text/html', 'href' => $item['plink']));
		$objtype = (($item['resource_type'] === 'photo') ? ACTIVITY_OBJ_PHOTO : ACTIVITY_OBJ_NOTE ); 

		$body = $item['body'];

		$object = json_encode(array(
			'type'    => $objtype,
			'id'      => $item['mid'],
			'parent'  => (($item['thr_parent']) ? $item['thr_parent'] : $item['parent_mid']),
			'link'    => $links,
			'title'   => $item['title'],
			'content' => $item['body'],
			'created' => $item['created'],
			'edited'  => $item['edited'],
			'author'  => array(
				'name'     => $item_author['xchan_name'],
				'address'  => $item_author['xchan_addr'],
				'guid'     => $item_author['xchan_guid'],
				'guid_sig' => $item_author['xchan_guid_sig'],
				'link'     => array(
					array('rel' => 'alternate', 'type' => 'text/html', 'href' => $item_author['xchan_url']),
					array('rel' => 'photo', 'type' => $item_author['xchan_photo_mimetype'], 'href' => $item_author['xchan_photo_m'])),
				),
		));

		if(! intval($item['item_thread_top']))
			$post_type = 'comment';		

		$arr['item_origin'] = 1;
		$arr['item_notshown'] = 1;

		if(intval($item['item_wall']))
			$arr['item_wall'] = 1;

		// if this was a linked photo and was hidden, unhide it.

		if(intval($item['item_hidden'])) {
			$r = q("update item set item_hidden = 0 where id = %d",
				intval($item['id'])
			);
		}	

	}

	if($verb === 'like')
		$bodyverb = t('%1$s likes %2$s\'s %3$s');
	if($verb === 'dislike')
		$bodyverb = t('%1$s doesn\'t like %2$s\'s %3$s');
	if($verb === 'agree')
		$bodyverb = t('%1$s agrees with %2$s\'s %3$s');
	if($verb === 'disagree')
		$bodyverb = t('%1$s doesn\'t agree with %2$s\'s %3$s');
	if($verb === 'abstain')
		$bodyverb = t('%1$s abstains from a decision on %2$s\'s %3$s');
	if($verb === 'attendyes')
		$bodyverb = t('%1$s is attending %2$s\'s %3$s');
	if($verb === 'attendno')
		$bodyverb = t('%1$s is not attending %2$s\'s %3$s');
	if($verb === 'attendmaybe')
		$bodyverb = t('%1$s may attend %2$s\'s %3$s');

	if(! isset($bodyverb))
			killme(); 

	

	if($extended_like) {
		$ulink = '[zrl=' . $ch[0]['xchan_url'] . ']' . $ch[0]['xchan_name'] . '[/zrl]';
		$alink = '[zrl=' . $observer['xchan_url'] . ']' . $observer['xchan_name'] . '[/zrl]';
		$private = (($public) ? 0 : 1);
	}
	else {
		$arr['parent']       = $item['id'];
		$arr['thr_parent']   = $item['mid'];
		$ulink = '[zrl=' . $item_author['xchan_url'] . ']' . $item_author['xchan_name'] . '[/zrl]';
		$alink = '[zrl=' . $observer['xchan_url'] . ']' . $observer['xchan_name'] . '[/zrl]';
		$plink = '[zrl=' . $a->get_baseurl() . '/display/' . $item['mid'] . ']' . $post_type . '[/zrl]';
		$allow_cid       = $item['allow_cid'];
		$allow_gid       = $item['allow_gid'];
		$deny_cid        = $item['deny_cid'];
		$deny_gid        = $item['deny_gid'];
		$private         = $item['private'];

	}
	

	$arr['mid']          = $mid;
	$arr['aid']          = (($extended_like) ? $ch[0]['channel_account_id'] : $owner_aid);
	$arr['uid']          = $owner_uid;
	$arr['item_flags']   = $item_flags;
	$arr['item_wall']    = $item_wall;
	$arr['parent_mid']   = (($extended_like) ? $mid : $item['mid']);
	$arr['owner_xchan']  = (($extended_like) ? $ch[0]['xchan_hash'] : $thread_owner['xchan_hash']);
	$arr['author_xchan'] = $observer['xchan_hash'];

	
	$arr['body']          =  sprintf( $bodyverb, $alink, $ulink, $plink );
	if($obj_type === 'thing' && $r[0]['imgurl']) {
		$arr['body'] .= "\n\n[zmg=80x80]" . $r[0]['imgurl'] . '[/zmg]';
	}	
	if($obj_type === 'profile') {
		if($public) {
			$arr['body'] .= "\n\n" . '[embed]' . z_root() . '/profile/' . $ch[0]['channel_address'] . '[/embed]';	
		}
		else
			$arr['body'] .= "\n\n[zmg=80x80]" . $profile['thumb'] . '[/zmg]';
	}	


	$arr['verb']          = $activity;
	$arr['obj_type']      = $objtype;
	$arr['object']        = $object;

	if($target) {
		$arr['tgt_type']  = $tgttype;
		$arr['target']    = $target;
	}

	$arr['allow_cid']     = $allow_cid;
	$arr['allow_gid']     = $allow_gid;
	$arr['deny_cid']      = $deny_cid;
	$arr['deny_gid']      = $deny_gid;
	$arr['item_private']  = $private;


	$post = item_store($arr);	
	$post_id = $post['item_id'];

	$arr['id'] = $post_id;

	call_hooks('post_local_end', $arr);


	if($extended_like) {
		$r = q("insert into likes (channel_id,liker,likee,iid,i_mid,verb,target_type,target_id,target) values (%d,'%s','%s',%d,'%s','%s','%s','%s','%s')",
			intval($ch[0]['channel_id']),
			dbesc($observer['xchan_hash']),
			dbesc($ch[0]['channel_hash']),
			intval($post_id),
			dbesc($mid),
			dbesc($activity),
			dbesc(($tgttype)? $tgttype : $objtype),
			dbesc($obj_id),
			dbesc(($target) ? $target  : $object)
		);
		$r = q("select * from likes where liker = '%s' and likee = '%s' and i_mid = '%s' and verb = '%s' and target_type = '%s' and target_id = '%s' ",
			dbesc($observer['xchan_hash']),
			dbesc($ch[0]['channel_hash']),
			dbesc($mid),
			dbesc($activity),
			dbesc(($tgttype)? $tgttype : $objtype),
			dbesc($obj_id)
		);
		if($r)
			build_sync_packet($ch[0]['channel_id'],array('likes' => $r));	

	}


	proc_run('php',"include/notifier.php","like","$post_id");

	if($interactive) {
		notice( t('Action completed.') . EOL);
		$o .= t('Thank you.');
		return $o;
	}

	killme();
}