components/url_fixer/url_fixer.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_URL_FIXER_URL_FIXER_H_
   6 #define COMPONENTS_URL_FIXER_URL_FIXER_H_
   7
   8 #include <string>
   9
  10 #include "base/strings/string16.h"
  11 #include "url/gurl.h"
  12
  13 namespace base {
  14 class FilePath;
  15 }
  16
  17 namespace url {
  18 struct Component;
  19 struct Parsed;
  20 }
  21
  22 // This object is designed to convert various types of input into URLs that we
  23 // know are valid. For example, user typing in the URL bar or command line
  24 // options. This is NOT the place for converting between different types of URLs
  25 // or parsing them, see net_util.h for that.
  26 namespace url_fixer {
  27
  28 // Segments the given text string into parts of a URL. This is most useful for
  29 // schemes such as http, https, and ftp where |SegmentURL| will find many
  30 // segments. Currently does not segment "file" schemes.
  31 // Returns the canonicalized scheme, or the empty string when |text| is only
  32 // whitespace.
  33 std::string SegmentURL(const std::string& text, url::Parsed* parts);
  34 base::string16 SegmentURL(const base::string16& text, url::Parsed* parts);
  35
  36 // Converts |text| to a fixed-up URL and returns it. Attempts to make some
  37 // "smart" adjustments to obviously-invalid input where possible.
  38 // |text| may be an absolute path to a file, which will get converted to a
  39 // "file:" URL.
  40 //
  41 // The result will be a "more" valid URL than the input. It may still not be
  42 // valid, so check the return value's validity or use possibly_invalid_spec().
  43 //
  44 // Schemes "about" and "chrome" are normalized to "chrome://", with slashes.
  45 // "about:blank" is unaltered, as Webkit allows frames to access about:blank.
  46 // Additionally, if a chrome URL does not have a valid host, as in "about:", the
  47 // returned URL will have the host "version", as in "chrome://version".
  48 //
  49 // If |desired_tld| is non-empty, it represents the TLD the user wishes to
  50 // append in the case of an incomplete domain. We check that this is not a file
  51 // path and there does not appear to be a valid TLD already, then append
  52 // |desired_tld| to the domain and prepend "www." (unless it, or a scheme, are
  53 // already present.)  This TLD should not have a leading '.' (use "com" instead
  54 // of ".com").
  55 GURL FixupURL(const std::string& text, const std::string& desired_tld);
  56
  57 // Converts |text| to a fixed-up URL, allowing it to be a relative path on the
  58 // local filesystem. Begin searching in |base_dir|; if empty, use the current
  59 // working directory. If this resolves to a file on disk, convert it to a
  60 // "file:" URL in |fixed_up_url|; otherwise, fall back to the behavior of
  61 // FixupURL().
  62 //
  63 // For "regular" input, even if it is possibly a file with a full path, you
  64 // should use FixupURL() directly. This function should only be used when
  65 // relative path handling is desired, as for command line processing.
  66 GURL FixupRelativeFile(const base::FilePath& base_dir,
  67                        const base::FilePath& text);
  68
  69 // Offsets the beginning index of |part| by |offset|, which is allowed to be
  70 // negative. In some cases, the desired component does not exist at the given
  71 // offset. For example, when converting from "http://foo" to "foo", the scheme
  72 // component no longer exists. In such a case, the beginning index is set to 0.
  73 // Does nothing if |part| is invalid.
  74 void OffsetComponent(int offset, url::Component* part);
  75
  76 // Returns true if |scheme1| is equivalent to |scheme2|.
  77 // Generally this is true if the two schemes are actually identical, but it's
  78 // also true when one scheme is "about" and the other "chrome".
  79 bool IsEquivalentScheme(const std::string& scheme1, const std::string& scheme2);
  80
  81 // For paths like ~, we use $HOME for the current user's home directory.
  82 // For tests, we allow our idea of $HOME to be overriden by this variable.
  83 extern const char* home_directory_override;
  84
  85 }  // namespace url_fixer
  86
  87 #endif  // COMPONENTS_URL_FIXER_URL_FIXER_H_