add gen_link_id() function to selectively encode/decode the message-id component of /display/ links for message-ids that contain troublesome characters

Zotlabs/Lib/ThreadItem.php

@@ -409,7 +409,7 @@ class ThreadItem {
 			'comment' => $this->get_comment_box($indent),
 			'previewing' => ($conv->is_preview() ? ' preview ' : ''),
 			'wait' => t('Please wait'),
-			'submid' => substr($item['mid'],0,32),
+			'submid' => base64_encode(substr($item['mid'],0,32)),
 			'thread_level' => $thread_level
 		);
 

Zotlabs/Module/Display.php

@@ -30,11 +30,9 @@ class Display extends \Zotlabs\Web\Controller {
 		if(argc() > 1 && argv(1) !== 'load')
 			$item_hash = argv(1);
 	
-	
 		if($_REQUEST['mid'])
 			$item_hash = $_REQUEST['mid'];
 
-	
 			if(! $item_hash) {
 			\App::$error = 404;
 			notice( t('Item not found.') . EOL);
@@ -94,8 +92,14 @@ class Display extends \Zotlabs\Web\Controller {
 	
 		$target_item = null;
 
+		if(strpos($item_hash,'b64.') === 0)
+			$decoded = @base64url_decode(substr($item_hash,4));
+		if($decoded)
+			$item_hash = $decoded;
+
 		$r = q("select id, uid, mid, parent_mid, item_type, item_deleted from item where mid like '%s' limit 1",
-			dbesc($item_hash . '%')
+			dbesc($item_hash . '%'),
+			dbesc($decoded . '%')
 		);
 	
 		if($r) {

Zotlabs/Module/Item.php

@@ -724,6 +724,8 @@ class Item extends \Zotlabs\Web\Controller {
 		if(! $mid) {
 			$mid = (($message_id) ? $message_id : item_message_id());
 		}
+
+
 		if(! $parent_mid) {
 			$parent_mid = $mid;
 		}
@@ -935,7 +937,7 @@ class Item extends \Zotlabs\Web\Controller {
 						'from_xchan'   => $datarray['author_xchan'],
 						'to_xchan'     => $datarray['owner_xchan'],
 						'item'         => $datarray,
-						'link'		   => z_root() . '/display/' . urlencode($datarray['mid']),
+						'link'		   => z_root() . '/display/' . gen_link_id($datarray['mid']),
 						'verb'         => ACTIVITY_POST,
 						'otype'        => 'item',
 						'parent'       => $parent,
@@ -953,7 +955,7 @@ class Item extends \Zotlabs\Web\Controller {
 						'from_xchan'   => $datarray['author_xchan'],
 						'to_xchan'     => $datarray['owner_xchan'],
 						'item'         => $datarray,
-						'link'		   => z_root() . '/display/' . urlencode($datarray['mid']),
+						'link'		   => z_root() . '/display/' . gen_link_id($datarray['mid']),
 						'verb'         => ACTIVITY_POST,
 						'otype'        => 'item'
 					));
@@ -1005,7 +1007,7 @@ class Item extends \Zotlabs\Web\Controller {
 		}
 	
 		$datarray['id']    = $post_id;
-		$datarray['llink'] = z_root() . '/display/' . urlencode($datarray['mid']);
+		$datarray['llink'] = z_root() . '/display/' . gen_link_id($datarray['mid']);
 	
 		call_hooks('post_local_end', $datarray);
 	

Zotlabs/Module/Like.php

@@ -447,7 +447,7 @@ class Like extends \Zotlabs\Web\Controller {
 			$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]';
-			$plink = '[zrl=' . z_root() . '/display/' . urlencode($item['mid']) . ']' . $post_type . '[/zrl]';
+			$plink = '[zrl=' . z_root() . '/display/' . gen_link_id($item['mid']) . ']' . $post_type . '[/zrl]';
 			$allow_cid       = $item['allow_cid'];
 			$allow_gid       = $item['allow_gid'];
 			$deny_cid        = $item['deny_cid'];

Zotlabs/Module/Subthread.php

@@ -138,7 +138,7 @@ class Subthread extends \Zotlabs\Web\Controller {
 	
 		$ulink = '[zrl=' . $item_author['xchan_url'] . ']' . $item_author['xchan_name'] . '[/zrl]';
 		$alink = '[zrl=' . $observer['xchan_url'] . ']' . $observer['xchan_name'] . '[/zrl]';
-		$plink = '[zrl=' . z_root() . '/display/' . urlencode($item['mid']) . ']' . $post_type . '[/zrl]';
+		$plink = '[zrl=' . z_root() . '/display/' . gen_link_id($item['mid']) . ']' . $post_type . '[/zrl]';
 		
 		$arr['body']          =  sprintf( $bodyverb, $alink, $ulink, $plink );
 	

Zotlabs/Module/Tagger.php

@@ -60,7 +60,7 @@ class Tagger extends \Zotlabs\Web\Controller {
 	
 	
 		$links = array(array('rel' => 'alternate','type' => 'text/html', 
-			'href' => z_root() . '/display/' . urlencode($item['mid'])));
+			'href' => z_root() . '/display/' . gen_link_id($item['mid'])));
 	
 		$target = json_encode(array(
 			'type'    => $targettype,

include/conversation.php

@@ -733,7 +733,7 @@ function conversation(&$a, $items, $mode, $update, $page_mode = 'traditional', $
 					'like' => '',
 					'dislike' => '',
 					'comment' => '',
-					'conv' => (($preview) ? '' : array('href'=> z_root() . '/display/' . urlencode($item['mid']), 'title'=> t('View in context'))),
+					'conv' => (($preview) ? '' : array('href'=> z_root() . '/display/' . gen_link_id($item['mid']), 'title'=> t('View in context'))),
 					'previewing' => $previewing,
 					'wait' => t('Please wait'),
 					'thread_level' => 1,

include/event.php

@@ -1018,7 +1018,7 @@ function event_store_item($arr, $event) {
 		if($wall)
 			$item_arr['plink'] = z_root() . '/channel/' . $z[0]['channel_address'] . '/?f=&mid=' . urlencode($item_arr['mid']);
 		else
-			$item_arr['plink'] = z_root() . '/display/' . urlencode($item_arr['mid']);
+			$item_arr['plink'] = z_root() . '/display/' . gen_link_id($item_arr['mid']);
 
 		$x = q("select * from xchan where xchan_hash = '%s' limit 1",
 				dbesc($arr['event_xchan'])

include/items.php

@@ -1624,7 +1624,7 @@ logger('revision: ' . $arr['revision']);
 	if($d2 > $d1)
 		$arr['item_delayed'] = 1;
 
-	$arr['llink'] = z_root() . '/display/' . urlencode($arr['mid']);
+	$arr['llink'] = z_root() . '/display/' . gen_link_id($arr['mid']);
 
 	if(! $arr['plink'])
 		$arr['plink'] = $arr['llink'];
@@ -2279,7 +2279,7 @@ function send_status_notifications($post_id,$item) {
 	if($unfollowed)
 		return;
 
-	$link =  z_root() . '/display/' . urlencode($item['mid']);
+	$link =  z_root() . '/display/' . gen_link_id($item['mid']);
 
 	$y = q("select id from notify where link = '%s' and uid = %d limit 1",
 		dbesc($link),

include/text.php

@@ -3124,6 +3124,12 @@ function cleanup_bbcode($body) {
 
 }
 
+function gen_link_id($mid) {
+	if(strpbrk($mid,':/&?<>"\'') !== false)
+		return 'b64.' . base64url_encode($mid);
+	return $mid;
+}
+
 // callback for array_walk
 
 function array_trim(&$v,$k) {
@@ -3133,3 +3139,4 @@ function array_trim(&$v,$k) {
 function array_escape_tags(&$v,$k) {
 	$v = escape_tags($v);
 }
+