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diff --git a/static/change-password.js b/static/change-password.js
new file mode 100644
index 0000000..8125464
--- /dev/null
+++ b/static/change-password.js
@@ -0,0 +1,80 @@
+// Copyright (c) 2020 by Juliusz Chroboczek.
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+'use strict';
+
+document.getElementById('passwordform').onsubmit = async function(e) {
+ e.preventDefault();
+
+ let parms = new URLSearchParams(window.location.search);
+ let group = parms.get('group');
+ if(!group) {
+ displayError("Couldn't determine group");
+ return;
+ }
+ let user = parms.get('username');
+ if(!user) {
+ displayError("Couldn't determine username");
+ return;
+ }
+
+ let old1 = document.getElementById('old1').value;
+ let old2 = document.getElementById('old2').value;
+ if(old1 !== old2) {
+ displayError("Passwords don't match.");
+ return;
+ }
+
+ try {
+ await doit(group, user, old1, document.getElementById('new').value);
+ document.getElementById('old1').value = '';
+ document.getElementById('old2').value = '';
+ document.getElementById('new').value = '';
+ displayError(null);
+ document.getElementById('message').textContent =
+ 'Password successfully changed.';
+ } catch(e) {
+ displayError(e.toString());
+ }
+}
+
+async function doit(group, user, old, pw) {
+ let creds = btoa(user + ":" + old);
+ let r = await fetch(`/galene-api/0/.groups/${group}/.users/${user}/.password`,
+ {
+ method: 'POST',
+ body: pw,
+ credentials: 'omit',
+ headers: {
+ 'Authorization': `Basic ${creds}`
+ }
+ });
+ if(!r.ok) {
+ if(r.status === 401)
+ throw new Error('Permission denied');
+ else
+ throw new Error(`The server said: ${r.status} ${r.statusText}`);
+ return;
+ }
+}
+
+function displayError(message) {
+ document.getElementById('errormessage').textContent = (message || '');
+}