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plugins/fs-extra/src/lib.rs

@@ -0,0 +1,145 @@
+// Copyright 2019-2021 Tauri Programme within The Commons Conservancy
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-License-Identifier: MIT
+
+use serde::{ser::Serializer, Serialize};
+use tauri::{command, plugin::Plugin, Invoke, Runtime};
+
+use std::{
+    path::PathBuf,
+    time::{SystemTime, UNIX_EPOCH},
+};
+
+#[cfg(unix)]
+use std::os::unix::fs::{MetadataExt, PermissionsExt};
+#[cfg(windows)]
+use std::os::windows::fs::MetadataExt;
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+}
+
+impl Serialize for Error {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(self.to_string().as_ref())
+    }
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+struct Permissions {
+    readonly: bool,
+    #[cfg(unix)]
+    mode: u32,
+}
+
+#[cfg(unix)]
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+struct UnixMetadata {
+    dev: u64,
+    ino: u64,
+    mode: u32,
+    nlink: u64,
+    uid: u32,
+    gid: u32,
+    rdev: u64,
+    blksize: u64,
+    blocks: u64,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+struct Metadata {
+    accessed_at_ms: u64,
+    created_at_ms: u64,
+    modified_at_ms: u64,
+    is_dir: bool,
+    is_file: bool,
+    is_symlink: bool,
+    size: u64,
+    permissions: Permissions,
+    #[cfg(unix)]
+    #[serde(flatten)]
+    unix: UnixMetadata,
+    #[cfg(windows)]
+    file_attributes: u32,
+}
+
+fn system_time_to_ms(time: std::io::Result<SystemTime>) -> u64 {
+    time.map(|t| {
+        let duration_since_epoch = t.duration_since(UNIX_EPOCH).unwrap();
+        duration_since_epoch.as_millis() as u64
+    })
+    .unwrap_or_default()
+}
+
+#[command]
+async fn metadata(path: PathBuf) -> Result<Metadata> {
+    let metadata = std::fs::metadata(path)?;
+    let file_type = metadata.file_type();
+    let permissions = metadata.permissions();
+    Ok(Metadata {
+        accessed_at_ms: system_time_to_ms(metadata.accessed()),
+        created_at_ms: system_time_to_ms(metadata.created()),
+        modified_at_ms: system_time_to_ms(metadata.modified()),
+        is_dir: file_type.is_dir(),
+        is_file: file_type.is_file(),
+        is_symlink: file_type.is_symlink(),
+        size: metadata.len(),
+        permissions: Permissions {
+            readonly: permissions.readonly(),
+            #[cfg(unix)]
+            mode: permissions.mode(),
+        },
+        #[cfg(unix)]
+        unix: UnixMetadata {
+            dev: metadata.dev(),
+            ino: metadata.ino(),
+            mode: metadata.mode(),
+            nlink: metadata.nlink(),
+            uid: metadata.uid(),
+            gid: metadata.gid(),
+            rdev: metadata.rdev(),
+            blksize: metadata.blksize(),
+            blocks: metadata.blocks(),
+        },
+        #[cfg(windows)]
+        file_attributes: metadata.file_attributes(),
+    })
+}
+
+#[command]
+async fn exists(path: PathBuf) -> bool {
+    path.exists()
+}
+
+/// Tauri plugin.
+pub struct FsExtra<R: Runtime> {
+    invoke_handler: Box<dyn Fn(Invoke<R>) + Send + Sync>,
+}
+
+impl<R: Runtime> Default for FsExtra<R> {
+    fn default() -> Self {
+        Self {
+            invoke_handler: Box::new(tauri::generate_handler![exists, metadata]),
+        }
+    }
+}
+
+impl<R: Runtime> Plugin<R> for FsExtra<R> {
+    fn name(&self) -> &'static str {
+        "fs-extra"
+    }
+
+    fn extend_api(&mut self, message: Invoke<R>) {
+        (self.invoke_handler)(message)
+    }
+}