1 files changed, 269 insertions, 0 deletions
diff --git a/Zotlabs/Module/Activity.php b/Zotlabs/Module/Activity.php
new file mode 100644
index 000000000..b75f0b245
--- /dev/null
+++ b/Zotlabs/Module/Activity.php
@@ -0,0 +1,269 @@
+<?php
+namespace Zotlabs\Module;
+
+use Zotlabs\Lib\IConfig;
+use Zotlabs\Lib\Enotify;
+use Zotlabs\Web\Controller;
+use Zotlabs\Daemon\Master;
+use Zotlabs\Lib\Activity as ZlibActivity;
+use Zotlabs\Lib\ActivityStreams;
+use Zotlabs\Lib\LDSignatures;
+use Zotlabs\Web\HTTPSig;
+use Zotlabs\Lib\Libzot;
+use Zotlabs\Lib\ThreadListener;
+use App;
+
+
+class Activity extends Controller {
+
+	function init() {
+
+		if (Libzot::is_zot_request()) {
+
+			$item_id = argv(1);
+			if (! $item_id)
+				http_status_exit(404, 'Not found');
+
+			$portable_id = EMPTY_STR;
+
+			$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 ";
+
+			$i = null;
+
+			// do we have the item (at all)?
+
+			$r = q("select * from item where mid = '%s' $item_normal limit 1",
+				dbesc(z_root() . '/activity/' . $item_id)
+			);
+
+			if (! $r) {
+				http_status_exit(404,'Not found');
+			}
+
+			// process an authenticated fetch
+
+			$sigdata = HTTPSig::verify(EMPTY_STR);
+			if($sigdata['portable_id'] && $sigdata['header_valid']) {
+				$portable_id = $sigdata['portable_id'];
+				observer_auth($portable_id);
+
+				// first see if we have a copy of this item's parent owned by the current signer
+				// include xchans for all zot-like networks - these will have the same guid and public key
+
+				$x = q("select * from xchan where xchan_hash = '%s'",
+					dbesc($sigdata['portable_id'])
+				);
+
+				if ($x) {
+					$xchans = q("select xchan_hash from xchan where xchan_hash = '%s' OR ( xchan_guid = '%s' AND xchan_pubkey = '%s' ) ",
+						dbesc($sigdata['portable_id']),
+						dbesc($x[0]['xchan_guid']),
+						dbesc($x[0]['xchan_pubkey'])
+					);
+
+					if ($xchans) {
+						$hashes = ids_to_querystr($xchans,'xchan_hash',true);
+						$i = q("select id as item_id from item where mid = '%s' $item_normal and owner_xchan in ( " . protect_sprintf($hashes) . " ) limit 1",
+							dbesc($r[0]['parent_mid'])
+						);
+					}
+				}
+			}
+
+			// if we don't have a parent id belonging to the signer see if we can obtain one as a visitor that we have permission to access
+			// with a bias towards those items owned by channels on this site (item_wall = 1)
+
+			$sql_extra = item_permissions_sql(0);
+
+			if (! $i) {
+				$i = q("select id as item_id from item where mid = '%s' $item_normal $sql_extra order by item_wall desc limit 1",
+					dbesc($r[0]['parent_mid'])
+				);
+			}
+
+			if(! $i) {
+				http_status_exit(403,'Forbidden');
+			}
+
+			$parents_str = ids_to_querystr($i,'item_id');
+	
+			$items = q("SELECT item.*, item.id AS item_id FROM item WHERE item.parent IN ( %s ) $item_normal ",
+				dbesc($parents_str)
+			);
+
+			if(! $items) {
+				http_status_exit(404, 'Not found');
+			}
+
+			xchan_query($items,true);
+			$items = fetch_post_tags($items,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');
+
+			$i = ZlibActivity::encode_item_collection($nitems,'conversation/' . $item_id,'OrderedCollection');
+			if($portable_id) {
+				ThreadListener::store(z_root() . '/activity/' . $item_id,$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();
+
+		}
+
+		if(ActivityStreams::is_as_request()) {
+
+			$item_id = argv(1);
+
+			if (! $item_id) {
+				return;
+			}
+
+			$ob_authorise = false;
+			$item_uid = 0;
+
+			$bear = ZlibActivity::token_from_request();
+			if ($bear) {
+				logger('bear: ' . $bear, LOGGER_DEBUG);
+				$t = q("select item.uid, iconfig.v from iconfig left join item on iid = item.id where cat = 'ocap' and item.uuid = '%s'",
+					dbesc($item_id)
+				);
+				if ($t) {
+					foreach ($t as $token) {
+						if ($token['v'] === $bear) {
+							$ob_authorize = true;
+							$item_uid = $token['uid'];
+							break;
+						}
+					}
+				}
+			}
+
+			$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 ";
+
+			$sigdata = HTTPSig::verify(EMPTY_STR);
+			if ($sigdata['portable_id'] && $sigdata['header_valid']) {
+				$portable_id = $sigdata['portable_id'];
+				if (! check_channelallowed($portable_id)) {
+					http_status_exit(403, 'Permission denied');
+				}
+				if (! check_siteallowed($sigdata['signer'])) {
+					http_status_exit(403, 'Permission denied');
+				}
+				observer_auth($portable_id);
+			}
+
+			// if passed an owner_id of 0 to item_permissions_sql(), we force "guest access" or observer checking
+			// Give ocap tokens priority
+
+			if ($ob_authorize) {
+				$sql_extra = " and item.uid = " . intval($token['uid']) . " ";
+			}
+			else {
+				$sql_extra = item_permissions_sql(0);
+			}
+
+			$r = q("select * from item where uuid = '%s' $item_normal $sql_extra limit 1",
+				dbesc($item_id)
+			);
+
+			if (! $r) {
+				$r = q("select * from item where uuid = '%s' $item_normal limit 1",
+					dbesc($item_id)
+				);
+				if($r) {
+					http_status_exit(403, 'Forbidden');
+				}
+				http_status_exit(404, 'Not found');
+			}
+
+			xchan_query($r,true);
+			$items = fetch_post_tags($r,false);
+
+			$channel = channelx_by_n($items[0]['uid']);
+
+			$x = array_merge( ['@context' => [
+				ACTIVITYSTREAMS_JSONLD_REV,
+				'https://w3id.org/security/v1',
+				z_root() . ZOT_APSCHEMA_REV
+				]], ZlibActivity::encode_activity($items[0],true));
+
+			$headers = [];
+			$headers['Content-Type'] = 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"' ;
+			$x['signature'] = LDSignatures::sign($x,$channel);
+			$ret = json_encode($x, JSON_UNESCAPED_SLASHES);
+			$headers['Date'] = datetime_convert('UTC','UTC', 'now', 'D, d M Y H:i:s \\G\\M\\T');
+			$headers['Digest'] = HTTPSig::generate_digest_header($ret);
+			$headers['(request-target)'] = strtolower($_SERVER['REQUEST_METHOD']) . ' ' . $_SERVER['REQUEST_URI'];
+
+			$h = HTTPSig::create_sig($headers,$channel['channel_prvkey'],channel_url($channel));
+			HTTPSig::set_headers($h);
+			echo $ret;
+			killme();
+
+		}
+
+		goaway(z_root() . '/item/' . argv(1));
+
+	}
+
+}