Add Export/Import Functionality for User Configuration

[alperozturk96]

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Is your feature request related to a problem? Please describe.

Currently, there is no way for users to export or import their configuration, including auto-upload folder settings, two-way-sync folders, user preferences, and other personalized settings. This makes it difficult to migrate settings across devices or for testing purposes.

Imagine you purchase a new device and want to transfer your exact app configuration from your old device, especially for settings that are not stored on the server. Alternatively, as a user, you may want to test a new QA APK without having to manually reconfigure it.

Describe the solution you'd like

Implement a two-way export/import mechanism for user configurations and preferences. This should include:

Auto-upload folder configurations User preferences (global pause state, two-way-sync configs, gridMode, theme) Other relevant configuration data

Technical Details:

Use JSON for export and import. Consider versioning the JSON structure to handle future changes without breaking backward compatibility. Include a "version" field at the top level of the exported JSON.

Data format:

{
  "version": "1.0",
  "userPreferences": {
    "lastDisplayedAccountName": "[email protected]",
    "theme": "dark",
    "gridMode": true
  },
  "autoUploadFolders": [
    {
      "folderName": "FolderA",
      "path": "/storage/emulated/0/FolderA"
    },
    {
      "folderName": "FolderB",
      "path": "/storage/emulated/0/FolderB"
    },
    {
      "folderName": "FolderC",
      "path": "/storage/emulated/0/FolderC"
    }
  ],
  "twoWaySync": {
    "enabled": true,
    "lastSyncTimestamp": 1694010000000
  }
}

Implementation:

Export: Serialize user settings into a JSON object and save it as a file. Import: Parse the JSON file, validate its version, and update user settings accordingly. Use kotlinx.serialization

Backward Compatibility:

When adding new settings in the future, maintain default values if the imported JSON does not contain them. Validate JSON schema to ensure corrupted or partially-complete files don’t break the app.

@tobiasKaminsky @jancborchardt