[Desktop] Fix mirror validation in settings dialog (#2375)

src/extensions/core/electronAdapter.ts

@@ -1,8 +1,10 @@
+import { PYTHON_MIRROR } from '@/constants/uvMirrors'
 import { t } from '@/i18n'
 import { app } from '@/scripts/app'
 import { useDialogService } from '@/services/dialogService'
 import { useWorkflowStore } from '@/stores/workflowStore'
 import { electronAPI as getElectronAPI, isElectron } from '@/utils/envUtil'
+import { checkMirrorReachable } from '@/utils/networkUtil'
 
 ;(async () => {
   if (!isElectron()) return
@@ -60,21 +62,34 @@ import { electronAPI as getElectronAPI, isElectron } from '@/utils/envUtil'
         name: 'Python Install Mirror',
         tooltip: `Managed Python installations are downloaded from the Astral python-build-standalone project. This variable can be set to a mirror URL to use a different source for Python installations. The provided URL will replace https://github.com/astral-sh/python-build-standalone/releases/download in, e.g., https://github.com/astral-sh/python-build-standalone/releases/download/20240713/cpython-3.12.4%2B20240713-aarch64-apple-darwin-install_only.tar.gz. Distributions can be read from a local directory by using the file:// URL scheme.`,
         type: 'url',
-        defaultValue: ''
+        defaultValue: '',
+        attrs: {
+          validateUrlFn(mirror: string) {
+            return checkMirrorReachable(
+              mirror + PYTHON_MIRROR.validationPathSuffix
+            )
+          }
+        }
       },
       {
         id: 'Comfy-Desktop.UV.PypiInstallMirror',
         name: 'Pypi Install Mirror',
         tooltip: `Default pip install mirror`,
         type: 'url',
-        defaultValue: ''
+        defaultValue: '',
+        attrs: {
+          validateUrlFn: checkMirrorReachable
+        }
       },
       {
         id: 'Comfy-Desktop.UV.TorchInstallMirror',
         name: 'Torch Install Mirror',
         tooltip: `Pip install mirror for pytorch`,
         type: 'url',
-        defaultValue: ''
+        defaultValue: '',
+        attrs: {
+          validateUrlFn: checkMirrorReachable
+        }
       }
     ],