Open configured vault folders

apps/desktop/src/folder_picker.rs

@@ -0,0 +1,69 @@
+//! Platform folder pickers without helper processes.
+
+use std::path::PathBuf;
+
+#[cfg(any(target_os = "macos", target_os = "windows"))]
+pub async fn pick_folder(initial: Option<PathBuf>) -> Result<Option<PathBuf>, String> {
+    let mut dialog = rfd::AsyncFileDialog::new().set_title("Open Password Store");
+    if let Some(initial) = initial.filter(|path| path.is_dir()) {
+        dialog = dialog.set_directory(initial);
+    }
+    Ok(dialog
+        .pick_folder()
+        .await
+        .map(|folder| folder.path().to_owned()))
+}
+
+#[cfg(target_os = "linux")]
+pub async fn pick_folder(initial: Option<PathBuf>) -> Result<Option<PathBuf>, String> {
+    use ashpd::{
+        PortalError,
+        desktop::{file_chooser::SelectedFiles, request::ResponseError},
+    };
+
+    let mut request = SelectedFiles::open_file()
+        .title("Open Password Store")
+        .accept_label("Open")
+        .modal(true)
+        .multiple(false)
+        .directory(true);
+    if let Some(initial) = initial.filter(|path| path.is_dir()) {
+        request = request
+            .current_folder(initial)
+            .map_err(|error| error.to_string())?;
+    }
+    let response = request.send().await.and_then(|request| request.response());
+    let selected = match response {
+        Ok(selected) => selected,
+        Err(ashpd::Error::Response(ResponseError::Cancelled))
+        | Err(ashpd::Error::Portal(PortalError::Cancelled(_))) => return Ok(None),
+        Err(error) => return Err(error.to_string()),
+    };
+    selected
+        .uris()
+        .first()
+        .ok_or_else(|| "folder portal returned no selection".to_owned())
+        .and_then(|uri| file_uri_path(uri.as_str()))
+        .map(Some)
+}
+
+#[cfg(target_os = "linux")]
+fn file_uri_path(uri: &str) -> Result<PathBuf, String> {
+    let uri = url::Url::parse(uri).map_err(|_| "folder portal returned an invalid URI")?;
+    uri.to_file_path()
+        .map_err(|()| "folder portal returned a non-file URI".to_owned())
+}
+
+#[cfg(all(test, target_os = "linux"))]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn portal_file_uris_are_decoded_and_other_schemes_are_rejected() {
+        assert_eq!(
+            file_uri_path("file:///tmp/password%20store").expect("file URI"),
+            PathBuf::from("/tmp/password store")
+        );
+        assert!(file_uri_path("https://example.test/store").is_err());
+    }
+}