content/browser/mime_registry_impl.cc

// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/mime_registry_impl.h"

#include "base/files/file_path.h"
#include "content/public/browser/browser_thread.h"
#include "mojo/public/cpp/bindings/message.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "net/base/mime_util.h"

namespace content {

MimeRegistryImpl::MimeRegistryImpl() = default;

MimeRegistryImpl::~MimeRegistryImpl() = default;

// static
void MimeRegistryImpl::Create(
    mojo::PendingReceiver<blink::mojom::MimeRegistry> receiver) {
  mojo::MakeSelfOwnedReceiver(std::make_unique<MimeRegistryImpl>(),
                              std::move(receiver));
}

void MimeRegistryImpl::GetMimeTypeFromExtension(
    const std::string& extension,
    GetMimeTypeFromExtensionCallback callback) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);

  if (!extension.empty() && extension[0] == '.') {
    // It is invalid to call this API with an extension with a leading dot.
    mojo::ReportBadMessage("Extensions must not have a leading dot");
    return;
  }

  std::string mime_type;
  net::GetMimeTypeFromExtension(
      base::FilePath::FromUTF8Unsafe(extension).value(), &mime_type);
  std::move(callback).Run(mime_type);
}

}  // namespace content