Several improvements to chat pre/post processing

src/utils/linkUtils.js

@@ -0,0 +1,70 @@
+/*Canopy - The next generation of stoner streaming software
+Copyright (C) 2024  Rainbownapkin and the TTN Community
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+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!
+
+module.exports.markLink = async function(link){
+    //Set max file size to 4MB
+    const maxSize = 4000000;
+    //Set badLink type
+    var type = 'deadLink';
+
+    //Make sure we have an actual, factual URL
+    if(validator.isURL(link)){
+        //Don't try this at home, we're what you call "Experts"
+        //TODO: Handle this shit simultaneously and send the chat before its done, then send updated types for each link as they're pulled individually
+        try{
+            //Pull content type
+            var response = await fetch(link,{
+                method: "HEAD",
+            });
+
+            //If we made it this far then the link is, at the very least, not dead.
+            type = 'link'
+
+            //Get file type from header
+            const fileType = response.headers.get('content-type');
+            const fileSize = response.headers.get('content-length');
+
+            //If they're reporting file types
+            if(fileType != null){
+                //If we have an image
+                if(fileType.match('image/')){
+                    //If the file size is unreported OR it's smaller than 4MB (not all servers report this and images that big are pretty rare)
+                    if(fileSize == null || fileSize <= maxSize){
+                        //Mark link as an image
+                        type = 'image';
+                    }
+                //If it's a video
+                }else if(fileType.match('video/mp4' || 'video/webm')){
+                    //If the server is reporting file-size and it's reporting under 4MB (Reject unreported sizes to be on the safe side is video is huge)
+                    if(fileSize != null && fileSize <= maxSize){
+                        //mark link as a video
+                        type = 'video';
+                    }
+                }
+            }
+        //Probably bad form but if something happens in here I'm blaming whoever hosted the link
+        //maybe don't host a fucked up server and I wouldn't handle with an empty catch
+        }catch{};
+    }
+
+    return {
+        link,
+        type
+    }
+}