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tauri/src/commands/mod.rs

@@ -12,3 +12,4 @@ pub mod queries;
 pub mod selection;
 pub mod statistics;
 pub mod storage;
+pub mod system;

tauri/src/commands/system.rs

@@ -0,0 +1,18 @@
+//! What the app asks of the system, outside of the files.
+
+use tauri::{AppHandle, Runtime};
+use tauri_plugin_opener::OpenerExt;
+
+/// Opens a web page (or an email to write) with the app of the system for it: the links of the
+/// page are not followed in the window of the app. Only `http`, `https` and `mailto` addresses are
+/// opened.
+#[tauri::command(async)]
+pub fn open_url<R: Runtime>(app: AppHandle<R>, url: String) -> Result<(), String> {
+    let allowed = ["http://", "https://", "mailto:"];
+    if !allowed.iter().any(|scheme| url.starts_with(scheme)) {
+        return Err(format!("{url} is not a web address"));
+    }
+    app.opener()
+        .open_url(url, None::<&str>)
+        .map_err(|error| error.to_string())
+}

tauri/src/lib.rs

@@ -50,6 +50,7 @@ pub fn run() {
     ));
     register_commands(builder)
         .plugin(tauri_plugin_dialog::init())
+        .plugin(tauri_plugin_opener::init())
         .setup(|app| {
             let handle = app.handle().clone();
             let emit: state::Emit = std::sync::Arc::new(move |event, payload| {
@@ -193,6 +194,8 @@ fn register_commands<R: tauri::Runtime>(builder: tauri::Builder<R>) -> tauri::Bu
         disk::reload_files,
         disk::export_files,
         disk::list_folder,
+        // the system
+        system::open_url,
     ])
 }