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mojo/shell/url_resolver.h

+// Copyright 2014 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.
+
+#ifndef SHELL_URL_RESOLVER_H_
+#define SHELL_URL_RESOLVER_H_
+
+#include <map>
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "url/gurl.h"
+
+namespace mojo {
+namespace shell {
+
+// This class supports the mapping of URLs to other URLs.
+// It's commonly used with mojo: URL, to provide a physical location (i.e.
+// file: or https:) but works with any URL.
+// By default, "mojo:" URLs resolve to a file location, with ".mojo" appended,
+// but that resolution can be customized via the AddCustomMapping method.
+class URLResolver {
+ public:
+  URLResolver();
+  ~URLResolver();
+
+  // Used for the return value of GetOriginMappings().
+  struct OriginMapping {
+    OriginMapping(const std::string& origin, const std::string& base_url)
+        : origin(origin), base_url(base_url) {}
+
+    std::string origin;
+    std::string base_url;
+  };
+
+  // Returns a list of origin mappings based on command line args.
+  // The switch --map-origin can be specified multiple times. Each occurance
+  // has the format of --map-origin={origin}={base_url}
+  // For example:
+  //   --map-origin=http://domokit.org=file:///source/out
+  static std::vector<OriginMapping> GetOriginMappings(
+      const base::CommandLine::StringVector& argv);
+
+  // Add a custom mapping for a particular URL. If |mapped_url| is
+  // itself a mojo url normal resolution rules apply.
+  void AddURLMapping(const GURL& url, const GURL& mapped_url);
+
+  // Add a custom mapping for all urls rooted at |origin|.
+  void AddOriginMapping(const GURL& origin, const GURL& base_url);
+
+  // Applies all custom mappings for |url|, returning the last non-mapped url.
+  // For example, if 'a' maps to 'b' and 'b' maps to 'c' calling this with 'a'
+  // returns 'c'.
+  GURL ApplyMappings(const GURL& url) const;
+
+  // If specified, then "mojo:" URLs will be resolved relative to this
+  // URL. That is, the portion after the colon will be appeneded to
+  // |mojo_base_url| with .mojo appended.
+  void SetMojoBaseURL(const GURL& mojo_base_url);
+
+  // Resolve the given "mojo:" URL to the URL that should be used to fetch the
+  // code for the corresponding Mojo App.
+  GURL ResolveMojoURL(const GURL& mojo_url) const;
+
+ private:
+  using GURLToGURLMap = std::map<GURL, GURL>;
+  GURLToGURLMap url_map_;
+  GURLToGURLMap origin_map_;
+  GURL mojo_base_url_;
+
+  DISALLOW_COPY_AND_ASSIGN(URLResolver);
+};
+
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // SHELL_URL_RESOLVER_H_