Move Password in file from wangle to folly

Summary: Move Password in file from wangle to folly

Reviewed By: ngoyal, yfeldblum

Differential Revision: D9192652

fbshipit-source-id: b883ddaf2d815b37677d9c5e924b3dd06aa0ec6b

folly/io/async/PasswordInFile.cpp

+/*
+ * Copyright 2017-present Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <folly/io/async/PasswordInFile.h>
+
+#include <folly/FileUtil.h>
+
+using namespace std;
+
+namespace folly {
+
+PasswordInFile::PasswordInFile(const string& file)
+    : fileName_(file) {
+  readFile(file.c_str(), password_);
+  auto p = password_.find('\0');
+  if (p != std::string::npos) {
+    password_.erase(p);
+  }
+}
+
+PasswordInFile::~PasswordInFile() {
+  OPENSSL_cleanse((char *)password_.data(), password_.length());
+}
+
+} // namespace wangle

folly/io/async/PasswordInFile.h

+/*
+ * Copyright 2017-present Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include <folly/io/async/SSLContext.h> // PasswordCollector
+
+namespace folly {
+
+class PasswordInFile : public PasswordCollector {
+ public:
+  explicit PasswordInFile(const std::string& file);
+  ~PasswordInFile() override;
+
+  void getPassword(std::string& password, int /* size */) const override {
+    password = password_;
+  }
+
+  const char* getPasswordStr() const {
+    return password_.c_str();
+  }
+
+  std::string describe() const override {
+    return fileName_;
+  }
+
+ protected:
+  std::string fileName_;
+  std::string password_;
+};
+
+} // namespace wangle