Updated backend to cache headers for embeded chat link

src/utils/linkUtils.js

@@ -17,7 +17,19 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.*/
 //NPM Imports
 const validator = require('validator');//No express here, so regular validator it is!
 
+//Create link cache
+module.exports.cache = new Map();
+
 module.exports.markLink = async function(link){
+    //Check link cache for the requested link
+    const cachedLink = module.exports.cache.get(link);
+
+    //If we have a cached result
+    if(cachedLink){
+        //return the cached link
+        return cachedLink;
+    }
+
     //Set max file size to 4MB
     const maxSize = 4000000;
     //Assume links are guilty until proven innocent
@@ -66,8 +78,20 @@ module.exports.markLink = async function(link){
         }catch{};
     }
 
-    return {
+    //Create the link object from processed information
+    const linkObj = {
         link,
         type
     }
+
+    //Cache the result
+    module.exports.cache.set(link, linkObj);
+
+    //Set timer to remove cache entry in five minutes
+    setTimeout(()=>{
+        module.exports.cache.delete(link);
+    }, 300000)
+
+    //return the link
+    return linkObj;
 }