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Allows MQTT Shared Subscriptions for MQTT-In core node

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This commit is contained in:
Lars Oldiges 2018-08-22 13:20:49 +02:00
parent d373105b32
commit df161ce672
1 changed files with 13 additions and 0 deletions
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13
nodes/core/io/10-mqtt.js
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@ -24,6 +24,19 @@ module.exports = function(RED) {
if (ts == "#") {
return true;
}
/* The following allows shared subscriptions (as in MQTT v5)
http://docs.oasis-open.org/mqtt/mqtt/v5.0/cs02/mqtt-v5.0-cs02.html#_Toc514345522
4.8.2 describes shares like:
$share/{ShareName}/{filter}
$share is a literal string that marks the Topic Filter as being a Shared Subscription Topic Filter.
{ShareName} is a character string that does not include "/", "+" or "#"
{filter} The remainder of the string has the same syntax and semantics as a Topic Filter in a non-shared subscription. Refer to section 4.7.
*/
else if(ts.startsWith("$share")){
ts = ts.replace(/^\$share\/[^#+/]+\/(.*)/g,"$1");
}
var re = new RegExp("^"+ts.replace(/([\[\]\?\(\)\\\\$\^\*\.|])/g,"\\$1").replace(/\+/g,"[^/]+").replace(/\/#$/,"(\/.*)?")+"$");
return re.test(t);
}