fix: 🐛 silently drop trailing slashes from origin input

ui/desktop/app/services/origin.js

@@ -63,6 +63,10 @@ export default class OriginService extends Service {
       typeof origin === 'string'
     );
     try {
+      // Silently drop trailing slashes if present.
+      // This is important since API paths that will be appended to the origin
+      // will include preceeding slashes already.
+      origin = origin.replace(/\/*$/, '');
       this.adapter.host = origin;
       this.rendererOrigin = origin;
       if (origin !== (await this.mainOrigin)) {

ui/desktop/electron-app/yarn.lock

@@ -3562,7 +3562,7 @@ xmlbuilder@^9.0.7:
   resolved "https://registry.yarnpkg.com/xmlbuilder/-/xmlbuilder-9.0.7.tgz#132ee63d2ec5565c557e20f4c22df9aca686b10d"
   integrity sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0=
 
-xmldom@0.1.x, xmldom@0.5.0:
+xmldom@0.1.x, xmldom@~0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/xmldom/-/xmldom-0.5.0.tgz#193cb96b84aa3486127ea6272c4596354cb4962e"
   integrity sha512-Foaj5FXVzgn7xFzsKeNIde9g6aFBxTPi37iwsno8QvApmtg7KYrr+OPyRHcJF7dud2a5nGRBXK3n0dL62Gf7PA==

ui/desktop/tests/unit/services/origin-test.js

@@ -24,4 +24,15 @@ module('Unit | Service | origin', function (hooks) {
       assert.equal(service.adapter.host, window.location.origin);
     });
   });
+
+  test('drops trailing slashes from origin on setOrigin', async function (assert) {
+    assert.expect(4);
+    sinon.stub(ipcService, 'invoke');
+    await service.setOrigin(`${window.location.origin}/`);
+    assert.equal(service.rendererOrigin, window.location.origin);
+    assert.equal(service.adapter.host, window.location.origin);
+    await service.setOrigin(`${window.location.origin}//////`);
+    assert.equal(service.rendererOrigin, window.location.origin);
+    assert.equal(service.adapter.host, window.location.origin);
+  });
 });