Initial commit

ui/xhr.js

@@ -0,0 +1,46 @@
+// Sshwifty - A Web SSH client
+//
+// Copyright (C) 2019 Rui NI <nirui@gmx.com>
+//
+// 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/>.
+
+export function head(url, headers) {
+  return new Promise((res, rej) => {
+    let authReq = new XMLHttpRequest();
+
+    authReq.onreadystatechange = () => {
+      if (authReq.readyState !== authReq.DONE) {
+        return;
+      }
+
+      res(authReq);
+    };
+
+    authReq.onerror = e => {
+      rej(e);
+    };
+
+    authReq.ontimeout = e => {
+      rej(e);
+    };
+
+    authReq.open("HEAD", url, true);
+
+    for (let h in headers) {
+      authReq.setRequestHeader(h, headers[h]);
+    }
+
+    authReq.send();
+  });
+}