add another up2k-hook example

contrib/plugins/up2k-hook-ytid.js

@@ -0,0 +1,69 @@
+// way more specific example --
+// assumes all files dropped into the uploader have a youtube-id somewhere in the filename,
+// locates the youtube-ids and passes them to an API which returns a list of IDS which should be uploaded
+
+function up2k_namefilter(good_files, nil_files, bad_files, hooks) {
+    var filenames = [],
+        file_lists = [good_files, nil_files, bad_files];
+
+    for (var lst of file_lists)
+        for (var ent of lst)
+            filenames.push(ent[1]);
+
+    var yt_ids = new Set();
+    for (var lst of file_lists)
+        for (var ent of lst) {
+            var m, name = ent[1];
+            while (true) {
+                // some ytdl fork did %(title)-%(id).%(ext) ...
+                m = /(?:^|[^\w])([\w-]{11})(?:$|[^\w-])/.exec(name);
+                if (!m)
+                    break;
+
+                yt_ids.add(m[1]);
+                name = name.replace(m[1], '');
+            }
+        }
+
+    toast.inf(5, `running query for ${yt_ids.size} videos...`);
+
+    var xhr = new XHR();
+    xhr.open('POST', '/ytq', true);
+    xhr.setRequestHeader('Content-Type', 'text/plain');
+    xhr.onload = xhr.onerror = function () {
+        if (this.status != 200)
+            return toast.err(0, `sorry, database query failed ;_;\n\nplease let us know so we can look at it, thx!!\n\nerror ${this.status}: ${(this.response && this.response.err) || this.responseText}`);
+
+        var new_lists = [],
+            ptn = new RegExp(this.responseText.trim().split('\n').join('|') || '\n'),
+            nothing_to_do = true,
+            n_skip = 0;
+
+        for (var lst of file_lists) {
+            var keep = [];
+            new_lists.push(keep);
+
+            for (var ent of lst)
+                if (ptn.exec(ent[1]))
+                    keep.push(ent);
+                else
+                    n_skip++;
+
+            if (keep.length)
+                nothing_to_do = false;
+        }
+
+        if (nothing_to_do)
+            return modal.alert('Good news -- turns out we already have all those videos.\n\nBut thank you for checking in!');
+        else if (n_skip)
+            toast.inf(0, `skipped ${n_skip} files which already exist on the server`);
+
+        [good_files, nil_files, bad_files] = new_lists;
+        hooks[0](good_files, nil_files, bad_files, hooks.slice(1));
+    };
+    xhr.send(Array.from(yt_ids).join('\n'));
+}
+
+up2k_hooks.push(function () {
+    up2k.gotallfiles.unshift(up2k_namefilter);
+});