more work on native wiki - revert now works; still remaining: diff, delete-page, rename-page and export wiki.

2 files changed, 820 insertions, 0 deletions

diff --git a/Zotlabs/Lib/NativeWiki.php b/Zotlabs/Lib/NativeWiki.php
new file mode 100644
index 000000000..87aba363c
--- /dev/null
+++ b/Zotlabs/Lib/NativeWiki.php
@@ -0,0 +1,199 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+use \Zotlabs\Storage\GitRepo as GitRepo;
+
+define ( 'NWIKI_ITEM_RESOURCE_TYPE', 'nwiki' );
+
+class NativeWiki {
+
+
+	static public function listwikis($channel, $observer_hash) {
+
+		$sql_extra = item_permissions_sql($channel['channel_id'], $observer_hash);
+		$wikis = q("SELECT * FROM item WHERE resource_type = '%s' AND mid = parent_mid AND uid = %d AND item_deleted = 0 $sql_extra", 
+			dbesc(NWIKI_ITEM_RESOURCE_TYPE),
+			intval($channel['channel_id'])
+		);
+
+		if($wikis) {
+			foreach($wikis as &$w) {
+				$w['rawName']  = get_iconfig($w, 'wiki', 'rawName');
+				$w['htmlName'] = get_iconfig($w, 'wiki', 'htmlName');
+				$w['urlName']  = get_iconfig($w, 'wiki', 'urlName');
+				$w['mimeType'] = get_iconfig($w, 'wiki', 'mimeType');
+				$w['lock']     = (($w['item_private'] || $w['allow_cid'] || $w['allow_gid'] || $w['deny_cid'] || $w['deny_gid']) ? true : false);
+			}
+		}
+		// TODO: query db for wikis the observer can access. Return with two lists, for read and write access
+		return array('wikis' => $wikis);
+	}
+
+
+	function create_wiki($channel, $observer_hash, $wiki, $acl) {
+
+		// Generate unique resource_id using the same method as item_message_id()
+		do {
+			$dups = false;
+			$resource_id = random_string();
+			$r = q("SELECT mid FROM item WHERE resource_id = '%s' AND resource_type = '%s' AND uid = %d LIMIT 1", 
+				dbesc($resource_id), 
+				dbesc(NWIKI_ITEM_RESOURCE_TYPE),
+				intval($channel['channel_id'])
+			);
+			if($r)
+				$dups = true;
+		} while($dups == true);
+
+		$ac = $acl->get();
+		$mid = item_message_id();
+
+		$arr = array();	// Initialize the array of parameters for the post
+		$item_hidden = ((intval($wiki['postVisible']) === 0) ? 1 : 0); 
+		$wiki_url = z_root() . '/wiki/' . $channel['channel_address'] . '/' . $wiki['urlName'];
+		$arr['aid'] = $channel['channel_account_id'];
+		$arr['uid'] = $channel['channel_id'];
+		$arr['mid'] = $mid;
+		$arr['parent_mid'] = $mid;
+		$arr['item_hidden'] = $item_hidden;
+		$arr['resource_type'] = NWIKI_ITEM_RESOURCE_TYPE;
+		$arr['resource_id'] = $resource_id;
+		$arr['owner_xchan'] = $channel['channel_hash'];
+		$arr['author_xchan'] = $observer_hash;
+		$arr['plink'] = z_root() . '/channel/' . $channel['channel_address'] . '/?f=&mid=' . $arr['mid'];
+		$arr['llink'] = $arr['plink'];
+		$arr['title'] = $wiki['htmlName'];		 // name of new wiki;
+		$arr['allow_cid'] = $ac['allow_cid'];
+		$arr['allow_gid'] = $ac['allow_gid'];
+		$arr['deny_cid'] = $ac['deny_cid'];
+		$arr['deny_gid'] = $ac['deny_gid'];
+		$arr['item_wall'] = 1;
+		$arr['item_origin'] = 1;
+		$arr['item_thread_top'] = 1;
+		$arr['item_private'] = intval($acl->is_private());
+		$arr['verb'] = ACTIVITY_CREATE;
+		$arr['obj_type'] = ACTIVITY_OBJ_WIKI;
+		$arr['body'] = '[table][tr][td][h1]New Wiki[/h1][/td][/tr][tr][td][zrl=' . $wiki_url . ']' . $wiki['htmlName'] . '[/zrl][/td][/tr][/table]';
+
+		// Save the wiki name information using iconfig. This is shareable.
+		if(! set_iconfig($arr, 'wiki', 'rawName', $wiki['rawName'], true)) {
+			return array('item' => null, 'success' => false);
+		}
+		if(! set_iconfig($arr, 'wiki', 'htmlName', $wiki['htmlName'], true)) {
+			return array('item' => null, 'success' => false);
+		}
+		if(! set_iconfig($arr, 'wiki', 'urlName', $wiki['urlName'], true)) {
+			return array('item' => null, 'success' => false);
+		}
+		if(! set_iconfig($arr, 'wiki', 'mimeType', $wiki['mimeType'], true)) {
+			return array('item' => null, 'success' => false);
+		}
+	
+		$post = item_store($arr);
+		$item_id = $post['item_id'];
+
+		if($item_id) {
+			\Zotlabs\Daemon\Master::Summon(array('Notifier', 'activity', $item_id));
+			return array('item' => $post['item'], 'success' => true);
+		}
+		else {
+			return array('item' => null, 'success' => false);
+		}
+	}
+
+	function delete_wiki($channel_id,$observer_hash,$resource_id) {
+
+		$w = self::get_wiki($channel_id,$observer_hash,$resource_id);
+		$item = $w['wiki'];
+		if(! $item) {
+			return array('item' => null, 'success' => false);
+		} 
+		else {
+			$drop = drop_item($item['id'], false, DROPITEM_NORMAL, true);
+		}
+
+		info( t('Wiki files deleted successfully'));
+
+		return array('item' => $item, 'success' => (($drop === 1) ? true : false));
+	}
+
+
+	static public function get_wiki($channel_id, $observer_hash, $resource_id) {
+		
+		$sql_extra = item_permissions_sql($channel_id,$observer_hash);
+
+		$item = q("SELECT * FROM item WHERE uid = %d AND resource_type = '%s' AND resource_id = '%s' AND item_deleted = 0 
+			$sql_extra limit 1",
+			intval($channel_id), 
+			dbesc(NWIKI_ITEM_RESOURCE_TYPE),
+			dbesc($resource_id)
+		);
+		if(! $item) {
+			return array('wiki' => null);
+		}
+		else {
+		
+			$w = $item[0];	// wiki item table record
+			// Get wiki metadata
+			$rawName  = get_iconfig($w, 'wiki', 'rawName');
+			$htmlName = get_iconfig($w, 'wiki', 'htmlName');
+			$urlName  = get_iconfig($w, 'wiki', 'urlName');
+			$mimeType = get_iconfig($w, 'wiki', 'mimeType');
+
+			return array(
+				'wiki' => $w,
+				'rawName' => $rawName,
+				'htmlName' => $htmlName,
+				'urlName' => $urlName,
+				'mimeType' => $mimeType
+			);
+		}
+	}
+
+
+	static public function exists_by_name($uid, $urlName) {
+
+		$sql_extra = item_permissions_sql($uid);		
+
+		$item = q("SELECT id, resource_id FROM item WHERE resource_type = '%s' AND title = '%s' AND uid = %d 
+			AND item_deleted = 0 $sql_extra limit 1", 
+			dbesc(NWIKI_ITEM_RESOURCE_TYPE), 
+			dbesc(escape_tags(urldecode($urlName))), 
+			intval($uid)
+		);
+
+		if($item) {
+			return array('id' => $item[0]['id'], 'resource_id' => $item[0]['resource_id']);
+		} 
+		else {
+			return array('id' => null, 'resource_id' => null);
+		}
+	}
+
+
+	static public function get_permissions($resource_id, $owner_id, $observer_hash) {
+		// TODO: For now, only the owner can edit
+		$sql_extra = item_permissions_sql($owner_id, $observer_hash);
+
+		if(local_channel() && local_channel() == $owner_id) {
+			return [ 'read' => true, 'write' => true, 'success' => true ];
+		}
+
+		$r = q("SELECT * FROM item WHERE uid = %d and resource_type = '%s' AND resource_id = '%s' $sql_extra LIMIT 1",
+			intval($owner_id),
+			dbesc(NWIKI_ITEM_RESOURCE_TYPE), 
+			dbesc($resource_id)
+		);
+
+		if(! $r) {
+			return array('read' => false, 'write' => false, 'success' => true);
+		}
+		else {
+			// TODO: Create a new permission setting for wiki analogous to webpages. Until
+			// then, use webpage permissions
+			$write = perm_is_allowed($owner_id, $observer_hash,'write_pages');
+			return array('read' => true, 'write' => $write, 'success' => true);
+		}
+	}
+}
\ No newline at end of file
diff --git a/Zotlabs/Lib/NativeWikiPage.php b/Zotlabs/Lib/NativeWikiPage.php
new file mode 100644
index 000000000..c78661654
--- /dev/null
+++ b/Zotlabs/Lib/NativeWikiPage.php
@@ -0,0 +1,621 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+use \Zotlabs\Lib as Zlib;
+
+class NativeWikiPage {
+
+	static public function page_list($channel_id,$observer_hash, $resource_id) {
+
+		// TODO: Create item table records for pages so that metadata like title can be applied
+		$w = Zlib\NativeWiki::get_wiki($channel_id,$observer_hash,$resource_id);
+
+		$pages[] = [
+			'resource_id' => '',
+			'title'       => 'Home',
+			'url'         => 'Home',
+			'link_id'     => 'id_wiki_home_0'
+		];
+
+		$sql_extra = item_permissions_sql($channel_id,$observer_hash);
+
+		$r = q("select * from item where resource_type = 'nwikipage' and resource_id = '%s' and uid = %d $sql_extra group by mid",
+			dbesc($resource_id),
+			intval($channel_id)
+		);
+		if($r) {
+			$items = fetch_post_tags($r,true);
+			foreach($items as $page_item) {
+				$title = get_iconfig($page_item['id'],'nwikipage','pagetitle',t('(No Title)'));
+				if(urldecode($title) !== 'Home') {
+					$pages[] = [
+						'resource_id' => $resource_id,
+						'title'       => urldecode($title),
+						'url'         => $title,
+						'link_id'     => 'id_' . substr($resource_id, 0, 10) . '_' . $page_item['id']
+					];
+				}
+			}
+		}
+
+		return array('pages' => $pages, 'wiki' => $w);
+	}
+
+
+	static public function create_page($channel_id, $observer_hash, $name, $resource_id) {
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+
+		// create an empty activity
+
+		$arr = [];
+		$arr['uid'] = $channel_id;
+		$arr['author_xchan'] = $observer_hash;
+		$arr['resource_type'] = 'nwikipage';
+		$arr['resource_id'] = $resource_id;
+
+		set_iconfig($arr,'nwikipage','pagetitle',urlencode(($name) ? $name : t('(No Title)')),true);
+
+		post_activity_item($arr, false, false);
+
+		$page = [ 
+			'rawName'  => $name,
+			'htmlName' => escape_tags($name),
+			'urlName'  => urlencode(escape_tags($name)), 
+			'fileName' => urlencode(escape_tags($name)) . Zlib\NativeWikiPage::get_file_ext($w)
+		];
+
+		return array('page' => $page, 'wiki' => $w, 'message' => '', 'success' => true);
+	}
+
+	static public function rename_page($arr) {
+		$pageUrlName   = ((array_key_exists('pageUrlName',$arr))   ? $arr['pageUrlName']   : '');
+		$pageNewName   = ((array_key_exists('pageNewName',$arr))   ? $arr['pageNewName']   : '');
+		$resource_id   = ((array_key_exists('resource_id',$arr))   ? $arr['resource_id']   : '');
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash'] : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']    : 0);
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+		if(! $w['path']) {
+			return array('message' => t('Wiki not found.'), 'success' => false);
+		}
+
+		$page_path_old = $w['path'] . '/' . $pageUrlName . \Zlib\NativeWikiPage::get_file_ext($w);
+
+		if(! is_readable($page_path_old) === true) {
+			return array('message' => 'Cannot read wiki page: ' . $page_path_old, 'success' => false);
+		}
+
+		$page = [ 
+			'rawName' => $pageNewName, 
+			'htmlName' => escape_tags($pageNewName), 
+			'urlName' => urlencode(escape_tags($pageNewName)), 
+			'fileName' => urlencode(escape_tags($pageNewName)) . \Zlib\NativeWikiPage::get_file_ext($w)
+		];
+
+		$page_path_new = $w['path'] . '/' . $page['fileName'] ;
+
+		if(is_file($page_path_new)) {
+			return array('message' => 'Page already exists.', 'success' => false);
+		}
+
+		// Rename the page file in the wiki repo
+		if(! rename($page_path_old, $page_path_new)) {
+			return array('message' => 'Error renaming page file.', 'success' => false);
+		}
+		else {
+			return array('page' => $page, 'message' => '', 'success' => true);
+		}
+	
+	}
+
+	static public function get_page_content($arr) {
+		$pageUrlName   = ((array_key_exists('pageUrlName',$arr))   ? $arr['pageUrlName']        : '');
+		$resource_id   = ((array_key_exists('resource_id',$arr))   ? $arr['resource_id']        : '');
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash']      : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? intval($arr['channel_id']) : 0);
+		$revision      = ((array_key_exists('revision',$arr))      ? intval($arr['revision'])   : (-1));
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+		if (! $w['wiki']) {
+			return array('content' => null, 'message' => 'Error reading wiki', 'success' => false);
+		}
+
+		$item = self::load_page($arr);
+
+		if($item) {
+			$content = $item['body'];
+
+			return [ 
+				'content' => json_encode($content), 
+				'mimeType' => $w['mimeType'], 
+				'message' => '', 
+				'success' => true
+			];
+		}
+	
+		return array('content' => null, 'message' => t('Error reading page content'), 'success' => false);
+
+	}
+
+	static public function page_history($arr) {
+		$pageUrlName = ((array_key_exists('pageUrlName',$arr)) ? $arr['pageUrlName'] : '');
+		$resource_id = ((array_key_exists('resource_id',$arr)) ? $arr['resource_id'] : '');
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash'] : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']    : 0);
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+		if (!$w['wiki']) {
+			return array('history' => null, 'message' => 'Error reading wiki', 'success' => false);
+		}
+
+		$items = self::load_page_history($arr);
+
+		$history = [];
+
+		if($items) {
+			$processed = 0;
+			foreach($items as $item) {
+				if($processed > 1000)
+					break;
+				$processed ++;
+				$history[] = [ 
+					'revision' => $item['revision'],
+					'date' => datetime_convert('UTC',date_default_timezone_get(),$item['created']),
+					'name' => $item['author']['xchan_name'],
+					'title' => get_iconfig($item,'nwikipage','commit_msg') 
+				];
+
+			}
+
+			return [ 'success' => true, 'history' => $history ];
+		}
+
+		return [ 'success' => false ];
+
+	}
+	
+
+	static public function load_page($arr) {
+logger('arr: ' . print_r($arr,true));
+		$pageUrlName   = ((array_key_exists('pageUrlName',$arr))   ? $arr['pageUrlName']     : '');
+		$resource_id   = ((array_key_exists('resource_id',$arr))   ? $arr['resource_id']     : '');
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash']   : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']      : 0);
+		$revision      = ((array_key_exists('revision',$arr))      ? $arr['revision']        : (-1));
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+		if (! $w['wiki']) {
+			return array('content' => null, 'message' => 'Error reading wiki', 'success' => false);
+		}
+
+		$ids = '';
+dbg(0);
+		$ic = q("select * from iconfig left join item on iconfig.iid = item.id where uid = %d and cat = 'nwikipage' and k = 'pagetitle' and v = '%s'",
+			intval($channel_id),
+			dbesc($pageUrlName)
+		);
+	
+		if($ic) {
+			foreach($ic as $c) {
+				if($ids)
+					$ids .= ',';
+				$ids .= intval($c['iid']);
+			}
+		}
+
+		$sql_extra = item_permissions_sql($channel_id,$observer_hash);
+		if($revision == (-1))
+	        $sql_extra .= " order by revision desc ";
+    	elseif($revision)
+        	$sql_extra .= " and revision = " . intval($revision) . " ";
+
+		$r = null;
+		if($ids) {
+			$r = q("select * from item where resource_type = 'nwikipage' and resource_id = '%s' and uid = %d and id in ( $ids ) $sql_extra limit 1",
+				dbesc($resource_id),
+				intval($channel_id)
+			);
+dbg(0);
+			if($r) {
+				$items = fetch_post_tags($r,true);
+				return $items[0];
+			}
+		}
+dbg(0);
+		return null;
+	}
+
+	static public function load_page_history($arr) {
+
+		$pageUrlName   = ((array_key_exists('pageUrlName',$arr))   ? $arr['pageUrlName']     : '');
+		$resource_id   = ((array_key_exists('resource_id',$arr))   ? $arr['resource_id']     : '');
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash']   : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']      : 0);
+		$revision      = ((array_key_exists('revision',$arr))      ? $arr['revision']        : (-1));
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+		if (! $w['wiki']) {
+			return array('content' => null, 'message' => 'Error reading wiki', 'success' => false);
+		}
+
+		$ids = '';
+
+		$ic = q("select * from iconfig left join item on iconfig.iid = item.id where uid = %d and cat = 'nwikipage' and k = 'pagetitle' and v = '%s'",
+			intval($channel_id),
+			dbesc($pageUrlName)
+		);
+	
+		if($ic) {
+			foreach($ic as $c) {
+				if($ids)
+					$ids .= ',';
+				$ids .= intval($c['iid']);
+			}
+		}
+
+		$sql_extra = item_permissions_sql($channel_id,$observer_hash);
+		$sql_extra .= " order by revision desc ";
+
+		$r = null;
+		if($ids) {
+			$r = q("select * from item where resource_type = 'nwikipage' and resource_id = '%s' and uid = %d and id in ( $ids ) $sql_extra",
+				dbesc($resource_id),
+				intval($channel_id)
+			);
+			if($r) {
+				xchan_query($r);
+				$items = fetch_post_tags($r,true);
+				return $items;
+			}
+		}
+
+		return null;
+	}
+
+
+
+	static public function prepare_content($s) {
+			
+		$text = preg_replace_callback('{
+					(?:\n\n|\A\n?)
+					(	            # $1 = the code block -- one or more lines, starting with a space/tab
+					  (?>
+						[ ]{'.'4'.'}  # Lines must start with a tab or a tab-width of spaces
+						.*\n+
+					  )+
+					)
+					((?=^[ ]{0,'.'4'.'}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
+				}xm',
+				'self::nwiki_prepare_content_callback', $s);
+	
+		return $text;
+	}
+	
+	static public function nwiki_prepare_content_callback($matches) {
+		$codeblock = $matches[1];
+	
+		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES, UTF8, false);
+		return "\n\n" . $codeblock ;
+	}
+	
+	
+	
+	static public function save_page($arr) {
+
+		$pageUrlName = ((array_key_exists('pageUrlName',$arr)) ? $arr['pageUrlName'] : '');
+		$content = ((array_key_exists('content',$arr)) ? purify_html(Zlib\NativeWikiPage::prepare_content($arr['content'])) : '');
+		$resource_id = ((array_key_exists('resource_id',$arr)) ? $arr['resource_id'] : '');
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash'] : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']    : 0);
+		$revision = ((array_key_exists('revision',$arr))    ? $arr['revision']    : 0);
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+
+		if (!$w['wiki']) {
+			return array('message' => t('Error reading wiki'), 'success' => false);
+		}
+	
+		$item = self::load_page($arr);
+		if(! $item) {
+			return array('message' => t('Page not found'), 'success' => false);
+		}
+		unset($item['id']);
+		unset($item['author']);
+
+		$item['parent'] = 0;
+		$item['body'] = $content;
+		$item['author_xchan'] = $observer_hash;
+		$item['revision'] = (($arr['revision']) ? intval($arr['revision']) + 1 : intval($item['revision']) + 1);
+
+		if($item['iconfig'] && is_array($item['iconfig']) && count($item['iconfig'])) {
+			for($x = 0; $x < count($item['iconfig']); $x ++) {
+				unset($item['iconfig'][$x]['id']);
+				unset($item['iconfig'][$x]['iid']);
+			}
+		}
+
+		$ret = item_store($item, false, false);
+
+		if($ret['item_id'])
+			return array('message' => '', 'filename' => $filename, 'success' => true);
+		else
+			return array('message' => t('Page update failed.'), 'success' => false);
+	}	
+
+	static public function delete_page($arr) {
+		$pageUrlName = ((array_key_exists('pageUrlName',$arr)) ? $arr['pageUrlName'] : '');
+		$resource_id = ((array_key_exists('resource_id',$arr)) ? $arr['resource_id'] : '');
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash'] : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']    : 0);
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+
+		if (!$w['path']) {
+			return array('message' => t('Error reading wiki'), 'success' => false);
+		}
+		$page_path = $w['path'] . '/' . $pageUrlName . wiki_get_file_ext($w);
+		if (is_writable($page_path) === true) {
+			if(!unlink($page_path)) {
+				return array('message' => t('Error deleting page file'), 'success' => false);
+			}
+			return array('message' => '', 'success' => true);
+		} 
+		else {
+			return array('message' => t('Page file not writable'), 'success' => false);
+		}	
+	}
+	
+	static public function revert_page($arr) {
+		$pageUrlName   = ((array_key_exists('pageUrlName',$arr))   ? $arr['pageUrlName']   : '');
+		$resource_id   = ((array_key_exists('resource_id',$arr))   ? $arr['resource_id']   : '');
+		$commitHash    = ((array_key_exists('commitHash',$arr))    ? $arr['commitHash']    : null);
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash'] : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']    : 0);
+
+		if (! $commitHash) {
+			return array('content' => $content, 'message' => 'No commit was provided', 'success' => false);
+		}
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+		if (!$w['wiki']) {
+			return array('content' => $content, 'message' => 'Error reading wiki', 'success' => false);
+		}
+
+		$x = $arr;
+
+		if(intval($commitHash) > 0) {
+			unset($x['commitHash']);
+			$x['revision'] = intval($commitHash) - 1;
+			$loaded = self::load_page($x);
+
+			if($loaded) {
+				$content = $loaded['body'];
+				return [ 'content' => $content, 'success' => true ];
+			}
+			return [ 'content' => $content, 'success' => false ]; 
+		}
+	}
+	
+	static public function compare_page($arr) {
+		$pageUrlName = ((array_key_exists('pageUrlName',$arr)) ? $arr['pageUrlName'] : '');
+		$resource_id = ((array_key_exists('resource_id',$arr)) ? $arr['resource_id'] : '');
+		$currentCommit = ((array_key_exists('currentCommit',$arr)) ? $arr['currentCommit'] : 'HEAD');
+		$compareCommit = ((array_key_exists('compareCommit',$arr)) ? $arr['compareCommit'] : null);
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash'] : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']    : 0);
+
+		if (! $compareCommit) {
+			return array('message' => t('No compare commit was provided'), 'success' => false);
+		}
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+
+		if (!$w['path']) {
+			return array('message' => t('Error reading wiki'), 'success' => false);
+		}
+		$page_path = $w['path'] . '/' . $pageUrlName . \Zlib\NativeWikiPage::get_file_ext($w);
+		if (is_readable($page_path) === true) {
+			$reponame = ((array_key_exists('title', $w['wiki'])) ? urlencode($w['wiki']['title']) : 'repo');
+			if($reponame === '') {
+				$reponame = 'repo';
+			}
+			$git = new GitRepo('', null, false, $w['wiki']['title'], $w['path']);
+			$compareContent = $currentContent = '';
+			try {
+				foreach ($git->git->tree($currentCommit) as $object) {
+					if ($object['type'] == 'blob' && $object['file'] === $pageUrlName . wiki_get_file_ext($w)) {
+							$currentContent = $git->git->cat->blob($object['hash']);						
+					}
+				}
+				foreach ($git->git->tree($compareCommit) as $object) {
+					if ($object['type'] == 'blob' && $object['file'] === $pageUrlName . wiki_get_file_ext($w)) {
+							$compareContent = $git->git->cat->blob($object['hash']);						
+					}
+				}
+				require_once('library/class.Diff.php');
+				$diff = Diff::toTable(Diff::compare($currentContent, $compareContent));
+			} 
+			catch (\PHPGit\Exception\GitException $e) {
+				return array('message' => t('GitRepo error thrown'), 'success' => false);
+			}
+			return array('diff' => $diff, 'message' => '', 'success' => true);
+		} 
+		else {
+			return array('message' => t('Page file not writable'), 'success' => false);
+		}
+	}
+	
+	static public function commit($arr) {
+logger('committing');
+		$commit_msg    = ((array_key_exists('commit_msg', $arr))   ? $arr['commit_msg']    : t('Page updated'));
+		$observer_hash = ((array_key_exists('observer_hash',$arr)) ? $arr['observer_hash'] : '');
+		$channel_id    = ((array_key_exists('channel_id',$arr))    ? $arr['channel_id']    : 0);
+		$pageUrlName   = ((array_key_exists('pageUrlName',$arr))   ? $arr['pageUrlName']   : t('Untitled'));
+
+		if(array_key_exists('resource_id', $arr)) {
+			$resource_id = $arr['resource_id'];
+		}
+		else {
+			return array('message' => t('Wiki resource_id required for git commit'), 'success' => false);
+		}
+
+		$w = Zlib\NativeWiki::get_wiki($channel_id, $observer_hash, $resource_id);
+
+		if (! $w['wiki']) {
+			return array('message' => t('Error reading wiki'), 'success' => false);
+		}
+
+		$page = self::load_page($arr);
+logger('commit: page: ' . print_r($page,true));
+		if($page) {
+			set_iconfig($page['id'],'nwikipage','commit_msg',escape_tags($commit_msg),true);
+			return [ 'success' => true, 'page' => $page ];
+		}
+
+		return [ 'success' => false, 'message' => t('Page not found.') ];
+
+	}
+	
+	static public function convert_links($s, $wikiURL) {
+		
+		if (strpos($s,'[[') !== false) {
+			preg_match_all("/\[\[(.*?)\]\]/", $s, $match);
+			$pages = $pageURLs = array();
+			foreach ($match[1] as $m) {
+				// TODO: Why do we need to double urlencode for this to work?
+				$pageURLs[] = urlencode(urlencode(escape_tags($m)));
+				$pages[] = $m;
+			}
+			$idx = 0;
+			while(strpos($s,'[[') !== false) {
+			$replace = '<a href="'.$wikiURL.'/'.$pageURLs[$idx].'">'.$pages[$idx].'</a>';
+				$s = preg_replace("/\[\[(.*?)\]\]/", $replace, $s, 1);
+				$idx++;
+			}
+		}
+		return $s;
+	}
+	
+	/**
+	 * Replace the instances of the string [toc] with a list element that will be populated by
+	 * a table of contents by the JavaScript library
+	 * @param string $s
+	 * @return string
+	 */
+	static public function generate_toc($s) {
+		if (strpos($s,'[toc]') !== false) {
+			//$toc_md = wiki_toc($s);	// Generate Markdown-formatted list prior to HTML render
+			$toc_md = '<ul id="wiki-toc"></ul>'; // use the available jQuery plugin http://ndabas.github.io/toc/
+			$s = preg_replace("/\[toc\]/", $toc_md, $s, -1);
+		}
+		return $s;
+	}
+	
+	/**
+	 *  Converts a select set of bbcode tags. Much of the code is copied from include/bbcode.php
+	 * @param string $s
+	 * @return string
+	 */
+	static public function bbcode($s) {
+			
+			$s = str_replace(array('[baseurl]', '[sitename]'), array(z_root(), get_config('system', 'sitename')), $s);
+			
+			$observer = App::get_observer();
+			if ($observer) {
+					$s1 = '<span class="bb_observer" title="' . t('Different viewers will see this text differently') . '">';
+					$s2 = '</span>';
+					$obsBaseURL = $observer['xchan_connurl'];
+					$obsBaseURL = preg_replace("/\/poco\/.*$/", '', $obsBaseURL);
+					$s = str_replace('[observer.baseurl]', $obsBaseURL, $s);
+					$s = str_replace('[observer.url]', $observer['xchan_url'], $s);
+					$s = str_replace('[observer.name]', $s1 . $observer['xchan_name'] . $s2, $s);
+					$s = str_replace('[observer.address]', $s1 . $observer['xchan_addr'] . $s2, $s);
+					$s = str_replace('[observer.webname]', substr($observer['xchan_addr'], 0, strpos($observer['xchan_addr'], '@')), $s);
+					$s = str_replace('[observer.photo]', '', $s);
+			} else {
+					$s = str_replace('[observer.baseurl]', '', $s);
+					$s = str_replace('[observer.url]', '', $s);
+					$s = str_replace('[observer.name]', '', $s);
+					$s = str_replace('[observer.address]', '', $s);
+					$s = str_replace('[observer.webname]', '', $s);
+					$s = str_replace('[observer.photo]', '', $s);
+			}
+	
+			return $s;
+	}
+	
+	static public function get_file_ext($arr) {
+		if($arr['mimeType'] == 'text/bbcode')
+			return '.bb';
+		else
+			return '.md';
+	}
+	
+	// This function is derived from 
+	// http://stackoverflow.com/questions/32068537/generate-table-of-contents-from-markdown-in-php
+	static public function toc($content) {
+	  // ensure using only "\n" as line-break
+	  $source = str_replace(["\r\n", "\r"], "\n", $content);
+	
+	  // look for markdown TOC items
+	  preg_match_all(
+		'/^(?:=|-|#).*$/m',
+		$source,
+		$matches,
+		PREG_PATTERN_ORDER | PREG_OFFSET_CAPTURE
+	  );
+	
+	  // preprocess: iterate matched lines to create an array of items
+	  // where each item is an array(level, text)
+	  $file_size = strlen($source);
+	  foreach ($matches[0] as $item) {
+		$found_mark = substr($item[0], 0, 1);
+		if ($found_mark == '#') {
+		  // text is the found item
+		  $item_text = $item[0];
+		  $item_level = strrpos($item_text, '#') + 1;
+		  $item_text = substr($item_text, $item_level);
+		} else {
+		  // text is the previous line (empty if <hr>)
+		  $item_offset = $item[1];
+		  $prev_line_offset = strrpos($source, "\n", -($file_size - $item_offset + 2));
+		  $item_text =
+			substr($source, $prev_line_offset, $item_offset - $prev_line_offset - 1);
+		  $item_text = trim($item_text);
+		  $item_level = $found_mark == '=' ? 1 : 2;
+		}
+		if (!trim($item_text) OR strpos($item_text, '|') !== FALSE) {
+		  // item is an horizontal separator or a table header, don't mind
+		  continue;
+		}
+		$raw_toc[] = ['level' => $item_level, 'text' => trim($item_text)];
+	  }
+		$o = '';
+		foreach($raw_toc as $t) {
+			$level = intval($t['level']);
+			$text = $t['text'];
+			switch ($level) {
+				case 1:
+					$li = '* ';
+					break;
+				case 2:
+					$li = '  * ';
+					break;
+				case 3:
+					$li = '    * ';
+					break;
+				case 4:
+					$li = '      * ';
+					break;
+				default:
+					$li = '* ';
+					break;
+			}
+			$o .= $li . $text . "\n";
+		}
+	  return $o;
+	}
+
+}
\ No newline at end of file