feat(themes): implement community themes workshop and chunked uploader

src-tauri/src/commands.rs

@@ -86,6 +86,53 @@ pub fn file_size(path: String) -> Option<u64> {
     metadata.is_file().then_some(metadata.len())
 }
 
+/// Calculate the SHA-256 checksum of a file on disk.
+#[tauri::command]
+pub async fn hash_file_sha256(path: String) -> Result<String, String> {
+    use sha2::{Digest, Sha256};
+    use std::io::Read;
+
+    tokio::task::spawn_blocking(move || {
+        let mut file = std::fs::File::open(&path)
+            .map_err(|e| format!("Failed to open file for hashing: {e}"))?;
+        let mut hasher = Sha256::new();
+        let mut buffer = [0u8; 65536];
+        loop {
+            let bytes_read = file
+                .read(&mut buffer)
+                .map_err(|e| format!("Failed to read file for hashing: {e}"))?;
+            if bytes_read == 0 {
+                break;
+            }
+            hasher.update(&buffer[..bytes_read]);
+        }
+        Ok::<_, String>(hex::encode(hasher.finalize()))
+    })
+    .await
+    .map_err(|e| format!("Thread error: {e}"))?
+}
+
+/// Read a chunk of a file on disk starting at `offset` for `length` bytes.
+#[tauri::command]
+pub async fn read_file_chunk(path: String, offset: u64, length: u64) -> Result<Vec<u8>, String> {
+    use std::io::{Read, Seek, SeekFrom};
+
+    tokio::task::spawn_blocking(move || {
+        let mut file = std::fs::File::open(&path)
+            .map_err(|e| format!("Failed to open file for chunk read: {e}"))?;
+        file.seek(SeekFrom::Start(offset))
+            .map_err(|e| format!("Failed to seek to offset {offset}: {e}"))?;
+        let mut buffer = vec![0u8; length as usize];
+        let bytes_read = file
+            .read(&mut buffer)
+            .map_err(|e| format!("Failed to read chunk bytes: {e}"))?;
+        buffer.truncate(bytes_read);
+        Ok::<_, String>(buffer)
+    })
+    .await
+    .map_err(|e| format!("Thread error: {e}"))?
+}
+
 #[tauri::command]
 pub fn get_hwid() -> String {
     get_id()

src-tauri/src/lib.rs

@@ -24,12 +24,12 @@ use crate::{
         export_theme, extract_theme, file_size, find_osu_installation, focus_presence_editor, focus_theme_editor, get_beatmapsets_count,
         get_ezpp_launcher_update_files, get_hwid, get_launcher_version, get_osu_release_stream,
         get_osu_skin, get_osu_version, get_platform, get_skins_count, has_net8, has_osuwinello,
-        has_wmctrl, install_ezpp_launcher_update, installation_diagnostics,
+        has_wmctrl, hash_file_sha256, install_ezpp_launcher_update, installation_diagnostics,
         is_open_tablet_driver_path_valid, is_open_tablet_driver_running, is_osu_running,
         list_theme_backups, log_frontend, open_logs_folder, open_presence_editor, open_theme_editor, open_theme_folder,
         open_url_in_browser, opened_urls, optimize_theme_media, pick_osu_installation,
         presence_connect, presence_disconnect, presence_is_connected, presence_update_activity,
-        presence_update_button, presence_update_status, presence_update_user, read_theme_info, replace_ui_files,
+        presence_update_button, presence_update_status, presence_update_user, read_file_chunk, read_theme_info, replace_ui_files,
         resolve_osu_folder, restore_theme_backup, reveal_window, run_open_tablet_driver, run_osu, run_osu_updater,
         save_theme_project, set_logging_enabled, set_osu_config_values, set_osu_user_config_values,
         stop_open_tablet_driver, theme_asset_base, theme_editor_context, theme_preview_url,
@@ -194,6 +194,8 @@ pub fn run() {
             download_and_extract_theme,
             save_theme_project,
             export_theme,
+            hash_file_sha256,
+            read_file_chunk,
             open_theme_folder,
             open_theme_editor,
             focus_theme_editor,