sftp: basic download works

This commits implements basic downloading feature for sftp URI.  This
includes segmented downloads, and connection (sftp session) pooling.
Download via HTTP proxy has not been implemented yet.

1 files changed, 99 insertions, 0 deletions

diff --git a/src/SftpDownloadCommand.cc b/src/SftpDownloadCommand.cc
new file mode 100644
index 00000000..84bfa913
--- /dev/null
+++ b/src/SftpDownloadCommand.cc
@@ -0,0 +1,99 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2015 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "SftpDownloadCommand.h"
+#include "Request.h"
+#include "SocketCore.h"
+#include "Segment.h"
+#include "DownloadEngine.h"
+#include "RequestGroup.h"
+#include "Option.h"
+#include "FileEntry.h"
+#include "SocketRecvBuffer.h"
+#include "AuthConfig.h"
+#include "SftpFinishDownloadCommand.h"
+
+namespace aria2 {
+
+SftpDownloadCommand::SftpDownloadCommand
+(cuid_t cuid,
+ const std::shared_ptr<Request>& req,
+ const std::shared_ptr<FileEntry>& fileEntry,
+ RequestGroup* requestGroup,
+ DownloadEngine* e,
+ const std::shared_ptr<SocketCore>& socket,
+ std::unique_ptr<AuthConfig> authConfig)
+  : DownloadCommand(cuid, req, fileEntry, requestGroup, e, socket,
+                    std::make_shared<SocketRecvBuffer>(socket)),
+    authConfig_(std::move(authConfig))
+{
+  setWriteCheckSocket(getSocket());
+}
+
+SftpDownloadCommand::~SftpDownloadCommand() {}
+
+bool SftpDownloadCommand::prepareForNextSegment()
+{
+  if(getOption()->getAsBool(PREF_FTP_REUSE_CONNECTION) &&
+     getFileEntry()->gtoloff(getSegments().front()->getPositionToWrite()) ==
+     getFileEntry()->getLength()) {
+
+    auto c = make_unique<SftpFinishDownloadCommand>
+      (getCuid(), getRequest(), getFileEntry(), getRequestGroup(),
+       getDownloadEngine(), getSocket());
+
+    c->setStatus(Command::STATUS_ONESHOT_REALTIME);
+    getDownloadEngine()->setNoWait(true);
+    getDownloadEngine()->addCommand(std::move(c));
+
+    if(getRequestGroup()->downloadFinished()) {
+      // To run checksum checking, we had to call following function here.
+      DownloadCommand::prepareForNextSegment();
+    }
+    return true;
+  }
+
+  return DownloadCommand::prepareForNextSegment();
+}
+
+int64_t SftpDownloadCommand::getRequestEndOffset() const
+{
+  return getFileEntry()->getLength();
+}
+
+bool SftpDownloadCommand::shouldEnableWriteCheck() {
+  return getSocket()->wantWrite() || !getSocket()->wantRead();
+}
+
+} // namespace aria2