Offline By Default

shell/application_manager/fetcher.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "shell/application_manager/fetcher.h"
 
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "url/gurl.h"
 
 namespace shell {
 
-const char Fetcher::kMojoMagic[] = "#!mojo ";
-const size_t Fetcher::kMaxShebangLength = 2048;
+namespace {
+const char kMojoMagic[] = "#!mojo ";
+const size_t kMaxShebangLength = 2048;
+}
 
 Fetcher::Fetcher(const FetchCallback& loader_callback)
     : loader_callback_(loader_callback) {
 }
 
 Fetcher::~Fetcher() {
 }
 
 bool Fetcher::PeekContentHandler(std::string* mojo_shebang,
                                  GURL* mojo_content_handler_url) {
   // TODO(aa): I guess this should just go in ApplicationManager now.
   std::string shebang;
   if (HasMojoMagic() && PeekFirstLine(&shebang)) {
     GURL url(shebang.substr(arraysize(kMojoMagic) - 1, std::string::npos));
     if (url.is_valid()) {
       *mojo_shebang = shebang;
       *mojo_content_handler_url = url;
       return true;
     }
   }
   return false;
 }
 
+// static
+bool Fetcher::HasMojoMagic(const base::FilePath& path) {
+  DCHECK(!path.empty());
+  std::string magic;
+  ReadFileToString(path, &magic, strlen(kMojoMagic));
+  return magic == kMojoMagic;
+}
+
+// static
+bool Fetcher::PeekFirstLine(const base::FilePath& path, std::string* line) {
+  DCHECK(!path.empty());
+  std::string start_of_file;
+  ReadFileToString(path, &start_of_file, kMaxShebangLength);
+  size_t return_position = start_of_file.find('\n');
+  if (return_position == std::string::npos)
+    return false;
+  *line = start_of_file.substr(0, return_position + 1);
+  return true;
+}
+
 }  // namespace shell