api2/admin/datastore/pxar_file_download: download directory as zip

by using the new ZipEncoder and recursively add files to it
the zip only contains directories, normal files and hardlinks (by simply
copying the content), no symlinks, etc.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/api2/admin/datastore.rs

@@ -2,6 +2,8 @@ use std::collections::{HashSet, HashMap};
 use std::ffi::OsStr;
 use std::os::unix::ffi::OsStrExt;
 use std::sync::{Arc, Mutex};
+use std::path::PathBuf;
+use std::pin::Pin;
 
 use anyhow::{bail, format_err, Error};
 use futures::*;
@@ -18,7 +20,7 @@ use proxmox::api::schema::*;
 use proxmox::tools::fs::{replace_file, CreateOptions};
 use proxmox::{http_err, identity, list_subdirs_api_method, sortable};
 
-use pxar::accessor::aio::Accessor;
+use pxar::accessor::aio::{Accessor, FileContents, FileEntry};
 use pxar::EntryKind;
 
 use crate::api2::types::*;
@@ -28,7 +30,12 @@ use crate::config::datastore;
 use crate::config::cached_user_info::CachedUserInfo;
 
 use crate::server::WorkerTask;
-use crate::tools::{self, AsyncReaderStream, WrappedReaderStream};
+use crate::tools::{
+    self,
+    zip::{ZipEncoder, ZipEntry},
+    AsyncChannelWriter, AsyncReaderStream, WrappedReaderStream,
+};
+
 use crate::config::acl::{
     PRIV_DATASTORE_AUDIT,
     PRIV_DATASTORE_MODIFY,
@@ -1241,6 +1248,69 @@ fn catalog(
     Ok(res.into())
 }
 
+fn recurse_files<T, W>(
+    mut zip: ZipEncoder<W>,
+    mut decoder: Accessor<T>,
+    prefix: PathBuf,
+    file: FileEntry<T>,
+) -> Pin<Box<dyn Future<Output = Result<(ZipEncoder<W>, Accessor<T>), Error>> + Send + 'static>>
+where
+    T: Clone + pxar::accessor::ReadAt + Unpin + Send + Sync + 'static,
+    W: tokio::io::AsyncWrite + Unpin + Send + 'static,
+{
+    Box::pin(async move {
+        let metadata = file.entry().metadata();
+        let path = file.entry().path().strip_prefix(&prefix)?.to_path_buf();
+
+        match file.kind() {
+            EntryKind::File { .. } => {
+                let entry = ZipEntry::new(
+                    path,
+                    metadata.stat.mtime.secs,
+                    metadata.stat.mode as u16,
+                    true,
+                );
+                zip.add_entry(entry, Some(file.contents().await?))
+                    .await
+                    .map_err(|err| format_err!("could not send file entry: {}", err))?;
+            }
+            EntryKind::Hardlink(_) => {
+                let realfile = decoder.follow_hardlink(&file).await?;
+                let entry = ZipEntry::new(
+                    path,
+                    metadata.stat.mtime.secs,
+                    metadata.stat.mode as u16,
+                    true,
+                );
+                zip.add_entry(entry, Some(realfile.contents().await?))
+                    .await
+                    .map_err(|err| format_err!("could not send file entry: {}", err))?;
+            }
+            EntryKind::Directory => {
+                let dir = file.enter_directory().await?;
+                let mut readdir = dir.read_dir();
+                let entry = ZipEntry::new(
+                    path,
+                    metadata.stat.mtime.secs,
+                    metadata.stat.mode as u16,
+                    false,
+                );
+                zip.add_entry::<FileContents<T>>(entry, None).await?;
+                while let Some(entry) = readdir.next().await {
+                    let entry = entry?.decode_entry().await?;
+                    let (zip_tmp, decoder_tmp) =
+                        recurse_files(zip, decoder, prefix.clone(), entry).await?;
+                    zip = zip_tmp;
+                    decoder = decoder_tmp;
+                }
+            }
+            _ => {} // ignore all else
+        };
+
+        Ok((zip, decoder))
+    })
+}
+
 #[sortable]
 pub const API_METHOD_PXAR_FILE_DOWNLOAD: ApiMethod = ApiMethod::new(
     &ApiHandler::AsyncHttp(&pxar_file_download),
@@ -1323,23 +1393,54 @@ fn pxar_file_download(
             .lookup(OsStr::from_bytes(file_path)).await?
             .ok_or(format_err!("error opening '{:?}'", file_path))?;
 
-        let file = match file.kind() {
-            EntryKind::File { .. } => file,
-            EntryKind::Hardlink(_) => {
-                decoder.follow_hardlink(&file).await?
-            },
-            // TODO symlink
+        let body = match file.kind() {
+            EntryKind::File { .. } => Body::wrap_stream(
+                AsyncReaderStream::new(file.contents().await?).map_err(move |err| {
+                    eprintln!("error during streaming of file '{:?}' - {}", filepath, err);
+                    err
+                }),
+            ),
+            EntryKind::Hardlink(_) => Body::wrap_stream(
+                AsyncReaderStream::new(decoder.follow_hardlink(&file).await?.contents().await?)
+                    .map_err(move |err| {
+                        eprintln!(
+                            "error during streaming of hardlink '{:?}' - {}",
+                            filepath, err
+                        );
+                        err
+                    }),
+            ),
+            EntryKind::Directory => {
+                let (sender, receiver) = tokio::sync::mpsc::channel(100);
+                let mut prefix = PathBuf::new();
+                let mut components = file.entry().path().components();
+                components.next_back(); // discar last
+                for comp in components {
+                    prefix.push(comp);
+                }
+
+                let channelwriter = AsyncChannelWriter::new(sender, 1024 * 1024);
+                let zipencoder = ZipEncoder::new(channelwriter);
+
+                crate::server::spawn_internal_task(async move {
+                    let (mut zipencoder, _) = recurse_files(zipencoder, decoder, prefix, file)
+                        .await
+                        .map_err(|err| eprintln!("error during creating of zip: {}", err))?;
+
+                    zipencoder
+                        .finish()
+                        .await
+                        .map_err(|err| eprintln!("error during finishing of zip: {}", err))
+                });
+
+                Body::wrap_stream(receiver.map_err(move |err| {
+                    eprintln!("error during streaming of zip '{:?}' - {}", filepath, err);
+                    err
+                }))
+            }
             other => bail!("cannot download file of type {:?}", other),
         };
 
-        let body = Body::wrap_stream(
-            AsyncReaderStream::new(file.contents().await?)
-                .map_err(move |err| {
-                    eprintln!("error during streaming of '{:?}' - {}", filepath, err);
-                    err
-                })
-        );
-
         // fixme: set other headers ?
         Ok(Response::builder()
            .status(StatusCode::OK)

www/window/FileBrowser.js

@@ -87,6 +87,9 @@ Ext.define("PBS.window.FileBrowser", {
 	    };
 	    params.filepath = data.filepath;
 	    atag.download = data.text;
+	    if (data.type === 'd') {
+		atag.download += ".zip";
+	    }
 	    atag.href = me
 	        .buildUrl(`/api2/json/admin/datastore/${view.datastore}/pxar-file-download`, params);
 	    atag.click();
@@ -106,6 +109,11 @@ Ext.define("PBS.window.FileBrowser", {
 		case 'f':
 		    canDownload = true;
 		    break;
+		case 'd':
+		    if (data.depth > 1) {
+			canDownload = true;
+		    }
+		    break;
 		default: break;
 	    }