support zot location independent urls

4 files changed, 320 insertions, 22 deletions

diff --git a/Zotlabs/Lib/Activity.php b/Zotlabs/Lib/Activity.php
index bcbe53df7..9aaf6d866 100644
--- a/Zotlabs/Lib/Activity.php
+++ b/Zotlabs/Lib/Activity.php
@@ -2,10 +2,7 @@
 
 namespace Zotlabs\Lib;
 
-use Zotlabs\Lib\Libzot;
-use Zotlabs\Lib\Libsync;
-use Zotlabs\Lib\ActivityStreams;
-use Zotlabs\Lib\Group;
+use Zotlabs\Zot6\HTTPSig;
 
 class Activity {
 
@@ -43,6 +40,46 @@ class Activity {
 
 	}
 
+	static function fetch($url,$channel = null) {
+		$redirects = 0;
+		if(! check_siteallowed($url)) {
+			logger('blacklisted: ' . $url);
+			return null;
+		}
+		if(! $channel) {
+			$channel = get_sys_channel();
+		}
+
+		logger('fetch: ' . $url, LOGGER_DEBUG);
+
+		if(strpos($url,'x-zot:') === 0) {
+			$x = ZotURL::fetch($url,$channel);
+		}
+		else {
+			$m = parse_url($url);
+			$headers = [
+				'Accept'           => 'application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
+				'Host'             => $m['host'],
+				'(request-target)' => 'get ' . get_request_string($url),
+				'Date'             => datetime_convert('UTC','UTC','now','D, d M Y H:i:s') . ' UTC'
+			];
+			$h = HTTPSig::create_sig($headers,$channel['channel_prvkey'],channel_url($channel),false);
+			$x = z_fetch_url($url, true, $redirects, [ 'headers' => $h ] );
+		}
+
+		if($x['success']) {
+			$y = json_decode($x['body'],true);
+			logger('returned: ' . json_encode($y,JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES));
+			return json_decode($x['body'], true);
+		}
+		else {
+			logger('fetch failed: ' . $url);
+		}
+		return null;
+	}
+
+
+
 
 	static function fetch_person($x) {
 		return self::fetch_profile($x);
diff --git a/Zotlabs/Lib/ActivityStreams.php b/Zotlabs/Lib/ActivityStreams.php
index 49978031e..a357b6d69 100644
--- a/Zotlabs/Lib/ActivityStreams.php
+++ b/Zotlabs/Lib/ActivityStreams.php
@@ -263,24 +263,8 @@ class ActivityStreams {
 		return self::fetch($url);
 	}
 
-	static function fetch($url) {
-		$redirects = 0;
-		if(! check_siteallowed($url)) {
-			logger('blacklisted: ' . $url);
-			return null;
-		}
-		logger('fetch: ' . $url, LOGGER_DEBUG);
-		$x = z_fetch_url($url, true, $redirects,
-			[ 'headers' => [ 'Accept: application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"' ]]);
-		if($x['success']) {
-			$y = json_decode($x['body'],true);
-			logger('returned: ' . json_encode($y,JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES));
-			return json_decode($x['body'], true);
-		}
-		else {
-			logger('fetch failed: ' . $url);
-		}
-		return null;
+	static function fetch($url,$channel = null) {
+		return Activity::fetch($url,$channel);
 	}
 
 	static function is_an_actor($s) {
diff --git a/Zotlabs/Lib/ZotURL.php b/Zotlabs/Lib/ZotURL.php
new file mode 100644
index 000000000..d1c705fcb
--- /dev/null
+++ b/Zotlabs/Lib/ZotURL.php
@@ -0,0 +1,91 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+use Zotlabs\Zot6\HTTPSig;
+
+
+class ZotURL {
+
+	static public function fetch($url,$channel) {
+
+		$ret = [ 'success' => false ];
+
+		if(strpos($url,'x-zot:') !== 0) {
+			return $ret;
+		}
+
+
+		if(! $url) {
+			return $ret;
+		}
+
+		$portable_url = substr($url,6);
+		$u = explode('/',$portable_url);		
+		$portable_id = $u[0];
+
+		$hosts = self::lookup($portable_id);
+
+		if(! $hosts) {
+			return $ret;
+		}
+
+		foreach($hosts as $h) {
+			$newurl = $h . '/id/' . $portable_url;
+
+			$m = parse_url($newurl);
+
+			$data = json_encode([ 'zot_token' => random_string() ]);
+
+			if($channel && $m) {
+
+				$headers = [ 
+					'Accept'           => 'application/x-zot+json', 
+					'Content-Type'     => 'application/x-zot+json',
+					'X-Zot-Token'      => random_string(),
+					'Digest'           => HTTPSig::generate_digest_header($data),
+					'Host'             => $m['host'],
+					'(request-target)' => 'post ' . get_request_string($newurl)
+				];
+				$h = HTTPSig::create_sig($headers,$channel['channel_prvkey'],channel_url($channel),false);
+			}
+			else {
+				$h = [ 'Accept: application/x-zot+json' ]; 
+			}
+				
+			$result = [];
+
+			$redirects = 0;
+			$x = z_post_url($newurl,$data,$redirects, [ 'headers' => $h  ] );
+			if($x['success']) {
+				return $x;
+			}
+		}
+
+		return $ret;
+
+	}
+
+	static public function is_zoturl($s) {
+
+		if(strpos($url,'x-zot:') === 0) {
+			return true;
+		}
+		return false;
+	}
+
+
+	static public function lookup($portable_id) {
+
+		$r = q("select * from hubloc left join site on hubloc_url = site_url where hubloc_hash = '%s' and site_dead = 0 order by hubloc_primary desc",
+			dbesc($portable_id)
+		);
+
+		if(! $r) {
+			// extend to network lookup
+			return false;
+		}
+		return ids_to_array($r,'hubloc_url');
+	}
+
+}
\ No newline at end of file
diff --git a/Zotlabs/Module/Id.php b/Zotlabs/Module/Id.php
new file mode 100644
index 000000000..9addd673f
--- /dev/null
+++ b/Zotlabs/Module/Id.php
@@ -0,0 +1,186 @@
+<?php
+
+namespace Zotlabs\Module;
+
+/**
+ *
+ * Controller for responding to x-zot: protocol requests
+ * x-zot:_jkfRG85nJ-714zn-LW_VbTFW8jSjGAhAydOcJzHxqHkvEHWG2E0RbA_pbch-h4R63RG1YJZifaNzgccoLa3MQ/453c1678-1a79-4af7-ab65-6b012f6cab77
+ *  
+ */  
+
+use Zotlabs\Lib\Activity;
+use Zotlabs\Lib\ActivityStreams;
+use Zotlabs\Lib\LDSignatures;
+use Zotlabs\Zot6\HTTPSig;
+use Zotlabs\Web\Controller;
+use Zotlabs\Lib\Libzot;
+use Zotlabs\Lib\ThreadListener;
+use Zotlabs\Lib\IConfig;
+use Zotlabs\Lib\Enotify;
+use App;
+
+require_once('include/attach.php');
+require_once('include/bbcode.php');
+require_once('include/security.php');
+
+
+class Id extends Controller {
+
+	function init() {
+
+		if(Libzot::is_zot_request()) {
+
+			$conversation = false;
+
+			$request_portable_id = argv(1);
+			if(argc() > 2) {
+				$item_id = argv(2);
+			}
+
+			$portable_id = EMPTY_STR;
+
+			$sigdata = HTTPSig::verify(EMPTY_STR);
+			if($sigdata['portable_id'] && $sigdata['header_valid']) {
+				$portable_id = $sigdata['portable_id'];
+			}
+
+			$r = q("select channel_id, channel_address from channel where channel_hash = '%s' limit 1",
+				dbesc($request_portable_id)
+			);
+			if($r) {
+				$channel_id = $r[0]['channel_id'];
+				if(! $item_id) {
+					$handler = new Channel();
+					App::$argc = 2;
+					App::$argv[0] = 'channel';
+					App::$argv[1] = $r[0]['channel_address'];
+					$handler->init();
+				}
+			}
+			else {
+				http_status_exit(404, 'Not found');
+			}
+
+
+			$item_normal = " and item.item_hidden = 0 and item.item_type = 0 and item.item_unpublished = 0 and item.item_delayed = 0 and item.item_blocked = 0 ";
+
+			$sql_extra = item_permissions_sql(0);
+
+			$r = q("select * from item where mid like '%s' $item_normal $sql_extra and uid = %d limit 1",
+				dbesc('%/' . $item_id),
+				intval($channel_id)
+			);
+			if(! $r) {
+
+				$r = q("select * from item where mid like '%s' $item_normal and uid = %d limit 1",
+					dbesc('%/' . $item_id),
+					intval($channel_id)
+				);
+				if($r) {
+					http_status_exit(403, 'Forbidden');
+				}
+				http_status_exit(404, 'Not found');
+			}
+
+
+			$items = q("select parent as item_id from item where mid = '%s' and uid = %d $item_normal $sql_extra ",
+				dbesc($r[0]['parent_mid']),
+				intval($r[0]['uid'])
+			);
+			if(! $items) {
+				http_status_exit(404, 'Not found');
+			}
+
+			$r = $items;
+
+			$parents_str = ids_to_querystr($r,'item_id');
+	
+			$items = q("SELECT item.*, item.id AS item_id FROM item WHERE item.parent IN ( %s ) $item_normal $sql_extra ",
+				dbesc($parents_str)
+			);
+
+			if(! $items) {
+				http_status_exit(404, 'Not found');
+			}
+
+			$r = $items;
+			xchan_query($r,true);
+			$items = fetch_post_tags($r,true);
+
+			$observer = App::get_observer();
+			$parent = $items[0];
+			$recips = (($parent['owner']['xchan_network'] === 'activitypub') ? get_iconfig($parent['id'],'activitypub','recips', []) : []);
+			$to = (($recips && array_key_exists('to',$recips) && is_array($recips['to'])) ? $recips['to'] : null);
+			$nitems = [];
+			foreach($items as $i) {
+
+				$mids = [];
+
+				if(intval($i['item_private'])) {
+					if(! $observer) {
+						continue;
+					}
+					// ignore private reshare, possibly from hubzilla
+					if($i['verb'] === 'Announce') {
+						if(! in_array($i['thr_parent'],$mids)) {
+							$mids[] = $i['thr_parent'];
+						}
+						continue;
+					}
+					// also ignore any children of the private reshares
+					if(in_array($i['thr_parent'],$mids)) {
+						continue;
+					}
+
+					if((! $to) || (! in_array($observer['xchan_url'],$to))) {
+						continue;
+					}
+
+				}
+				$nitems[] = $i;
+			}
+
+			if(! $nitems)
+				http_status_exit(404, 'Not found');
+
+			$chan = channelx_by_n($nitems[0]['uid']);
+
+			if(! $chan)
+				http_status_exit(404, 'Not found');
+
+			if(! perm_is_allowed($chan['channel_id'],get_observer_hash(),'view_stream'))
+				http_status_exit(403, 'Forbidden');
+
+			$i = Activity::encode_item_collection($nitems,'conversation/' . $item_id,'OrderedCollection',( defined('NOMADIC') ? false : true));
+			if($portable_id) {
+				ThreadListener::store(z_root() . '/item/' . $item_id,$portable_id);
+			}
+
+			if(! $i)
+				http_status_exit(404, 'Not found');
+
+			$x = array_merge(['@context' => [
+				ACTIVITYSTREAMS_JSONLD_REV,
+				'https://w3id.org/security/v1',
+				z_root() . ZOT_APSCHEMA_REV
+				]], $i);
+
+			$headers = [];
+			$headers['Content-Type'] = 'application/x-zot+json' ;
+			$x['signature'] = LDSignatures::sign($x,$chan);
+			$ret = json_encode($x, JSON_UNESCAPED_SLASHES);
+			$headers['Digest'] = HTTPSig::generate_digest_header($ret);
+			$headers['(request-target)'] = strtolower($_SERVER['REQUEST_METHOD']) . ' ' . $_SERVER['REQUEST_URI'];
+			$h = HTTPSig::create_sig($headers,$chan['channel_prvkey'],channel_url($chan));
+			HTTPSig::set_headers($h);
+			echo $ret;
+			killme();
+
+		}
+
+	}
+
+}
+
+