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template_url.h

// Copyright (c) 2009 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 CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_H_
#define CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_H_

#include <string>
#include <vector>

#include "base/time.h"
#include "googleurl/src/gurl.h"
#include "testing/gtest/include/gtest/gtest_prod.h"

class TemplateURL;

// TemplateURL represents the relevant portions of the Open Search Description
// Document (http://www.opensearch.org/Specifications/OpenSearch).
// The main use case for TemplateURL is to use the TemplateURLRef returned by
// suggestions_url or url for keyword/suggestion expansion:
// . suggestions_url describes a URL that is ideal for as you type suggestions.
//   The returned results are in the mime type application/x-suggestions+json.
// . url describes a URL that may be used as a shortcut. Returned results are
//   are text/html.
// Before using either one, make sure it's non-NULL, and if you intend to use
// it to replace search terms, make sure SupportsReplacement returns true.
// To use either URL invoke the ReplaceSearchTerms method on the corresponding
// TemplateURLRef.
//
// For files parsed from the Web, be sure and invoke IsValid. IsValid returns
// true if the URL could be parsed.
//
// Both TemplateURL and TemplateURLRef have value semantics. This allows the
// UI to create a copy while the user modifies the values.
class TemplateURLRef {
 public:
  // Magic numbers to pass to ReplaceSearchTerms() for the |accepted_suggestion|
  // parameter.  Most callers aren't using Suggest capabilities and should just
  // pass NO_SUGGESTIONS_AVAILABLE.
  // NOTE: Because positive values are meaningful, make sure these are negative!
  enum AcceptedSuggestion {
    NO_SUGGESTION_CHOSEN = -1,
    NO_SUGGESTIONS_AVAILABLE = -2,
  };

  TemplateURLRef();

  TemplateURLRef(const std::wstring& url, int index_offset, int page_offset)
      : url_(url),
        index_offset_(index_offset),
        page_offset_(page_offset),
        parsed_(false),
        valid_(false),
        supports_replacements_(false) {
  }

  // Returns true if this URL supports replacement.
  bool SupportsReplacement() const;

  // Returns a string that is the result of replacing the search terms in
  // the url with the specified value.
  //
  // If this TemplateURLRef does not support replacement (SupportsReplacement
  // returns false), an empty string is returned.
  //
  // The TemplateURL is used to determine the input encoding for the term.
  std::wstring ReplaceSearchTerms(
      const TemplateURL& host,
      const std::wstring& terms,
      int accepted_suggestion,
      const std::wstring& original_query_for_suggestion) const;

  // Returns the raw URL. None of the parameters will have been replaced.
  const std::wstring& url() const { return url_; }

  // Returns the index number of the first search result.
  int index_offset() const { return index_offset_; }

  // Returns the page number of the first search results.
  int page_offset() const { return page_offset_; }

  // Returns true if the TemplateURLRef is valid. An invalid TemplateURLRef is
  // one that contains unknown terms, or invalid characters.
  bool IsValid() const;

  // Returns a string representation of this TemplateURLRef suitable for
  // display. The display format is the same as the format used by Firefox.
  std::wstring DisplayURL() const;

  // Converts a string as returned by DisplayURL back into a string as
  // understood by TemplateURLRef.
  static std::wstring DisplayURLToURLRef(const std::wstring& display_url);

  // If this TemplateURLRef is valid and contains one search term, this returns
  // the host/path of the URL, otherwise this returns an empty string.
  const std::string& GetHost() const;
  const std::string& GetPath() const;

  // If this TemplateURLRef is valid and contains one search term, this returns
  // the key of the search term, otherwise this returns an empty string.
  const std::string& GetSearchTermKey() const;

  // Converts the specified term in the encoding of the host TemplateURL to a
  // wide string.
  std::wstring SearchTermToWide(const TemplateURL& host,
                                const std::string& term) const;

  // Returns true if this TemplateURLRef has a replacement term of
  // {google:baseURL} or {google:baseSuggestURL}.
  bool HasGoogleBaseURLs() const;

 private:
  friend class TemplateURL;
  friend class TemplateURLModelTest;
  friend class TemplateURLTest;
  FRIEND_TEST(TemplateURLTest, ParseParameterKnown);
  FRIEND_TEST(TemplateURLTest, ParseParameterUnknown);
  FRIEND_TEST(TemplateURLTest, ParseURLEmpty);
  FRIEND_TEST(TemplateURLTest, ParseURLNoTemplateEnd);
  FRIEND_TEST(TemplateURLTest, ParseURLNoKnownParameters);
  FRIEND_TEST(TemplateURLTest, ParseURLTwoParameters);
  FRIEND_TEST(TemplateURLTest, ParseURLNestedParameter);

  // Enumeration of the known types.
  enum ReplacementType {
    ENCODING,
    GOOGLE_ACCEPTED_SUGGESTION,
    GOOGLE_BASE_URL,
    GOOGLE_BASE_SUGGEST_URL,
    GOOGLE_ORIGINAL_QUERY_FOR_SUGGESTION,
    GOOGLE_RLZ,
    GOOGLE_UNESCAPED_SEARCH_TERMS,
    LANGUAGE,
    SEARCH_TERMS,
  };

  // Used to identify an element of the raw url that can be replaced.
  struct Replacement {
    Replacement(ReplacementType type, int index) : type(type), index(index) {}
    ReplacementType type;
    int index;
  };

  // The list of elements to replace.
  typedef std::vector<struct Replacement> Replacements;

  // TemplateURLRef internally caches values to make replacement quick. This
  // method invalidates any cached values.
  void InvalidateCachedValues() const;

  // Resets the url.
  void Set(const std::wstring& url, int index_offset, int page_offset);

  // Parses the parameter in url at the specified offset. start/end specify the
  // range of the parameter in the url, including the braces. If the parameter
  // is valid, url is updated to reflect the appropriate parameter. If
  // the parameter is one of the known parameters an element is added to
  // replacements indicating the type and range of the element. The original
  // parameter is erased from the url.
  //
  // If the parameter is not a known parameter, it's not erased and false is
  // returned.
  bool ParseParameter(size_t start,
                      size_t end,
                      std::wstring* url,
                      Replacements* replacements) const;

  // Parses the specified url, replacing parameters as necessary. If
  // successful, valid is set to true, and the parsed url is returned. For all
  // known parameters that are encountered an entry is added to replacements.
  // If there is an error parsing the url, valid is set to false, and an empty
  // string is returned.
  std::wstring ParseURL(const std::wstring& url,
                        Replacements* replacements,
                        bool* valid) const;

  // If the url has not yet been parsed, ParseURL is invoked.
  // NOTE: While this is const, it modifies parsed_, valid_, parsed_url_ and
  // search_offset_.
  void ParseIfNecessary() const;

  // Extracts the query key and host from the url.
  void ParseHostAndSearchTermKey() const;

  // Returns the value for the GOOGLE_BASE_URL term.
  static std::wstring GoogleBaseURLValue();

  // Returns the value for the GOOGLE_BASE_SUGGEST_URL term.
  static std::wstring GoogleBaseSuggestURLValue();

  // The raw URL. Where as this contains all the terms (such as {searchTerms}),
  // parsed_url_ has them all stripped out.
  std::wstring url_;

  // indexOffset defined for the Url element.
  int index_offset_;

  // searchOffset defined for the Url element.
  int page_offset_;

  // Whether the URL has been parsed.
  mutable bool parsed_;

  // Whether the url was successfully parsed.
  mutable bool valid_;

  // The parsed URL. All terms have been stripped out of this with
  // replacements_ giving the index of the terms to replace.
  mutable std::wstring parsed_url_;

  // Do we support replacement?
  mutable bool supports_replacements_;

  // The replaceable parts of url (parsed_url_). These are ordered by index
  // into the string, and may be empty.
  mutable Replacements replacements_;

  // Host, path and key of the search term. These are only set if the url
  // contains one search term.
  mutable std::string host_;
  mutable std::string path_;
  mutable std::string search_term_key_;

  // For testing. If non-null this is the replacement value for GOOGLE_BASE_URL
  // terms.
  static std::wstring* google_base_url_;
};

// Describes the relevant portions of a single OSD document.
class TemplateURL {
 public:
  typedef int64 IDType;

  // Describes a single image reference. Each TemplateURL may have
  // any number (including 0) of ImageRefs.
  //
  // If a TemplateURL has no images, the favicon for the generated URL
  // should be used.
  struct ImageRef {
    ImageRef(const std::wstring& type, int width, int height)
        : type(type), width(width), height(height) {
    }

    ImageRef(const std::wstring& type, int width, int height, const GURL& url)
      : type(type), width(width), height(height), url(url) {
    }

    // Mime type for the image.
    // ICO image will have the format: image/x-icon or image/vnd.microsoft.icon
    std::wstring type;

    // Size of the image
    int width;
    int height;

    // URL of the image.
    GURL url;
  };

  // Generates a favicon URL from the specified url.
  static GURL GenerateFaviconURL(const GURL& url);

  // Returns true if |true| is non-null and has a search URL that supports
  // replacement.
  static bool SupportsReplacement(const TemplateURL* turl);

  TemplateURL()
      : autogenerate_keyword_(false),
        show_in_default_list_(false),
        safe_for_autoreplace_(false),
        id_(0),
        date_created_(base::Time::Now()),
        usage_count_(0),
        prepopulate_id_(0) {}
  ~TemplateURL() {}

  // A short description of the template. This is the name we show to the user
  // in various places that use keywords. For example, the location bar shows
  // this when the user selects the keyword.
  void set_short_name(const std::wstring& short_name) {
    short_name_ = short_name;
  }
  const std::wstring& short_name() const { return short_name_; }

  // An accessor for the short_name, but adjusted so it can be appropriately
  // displayed even if it is LTR and the UI is RTL.
  std::wstring AdjustedShortNameForLocaleDirection() const;

  // A description of the template; this may be empty.
  void set_description(const std::wstring& description) {
    description_ = description;
  }
  const std::wstring& description() const { return description_; }

  // URL providing JSON results. This is typically used to provide suggestions
  // as your type. If NULL, this url does not support suggestions.
  // Be sure and check the resulting TemplateURLRef for SupportsReplacement
  // before using.
  void SetSuggestionsURL(const std::wstring& suggestions_url,
                         int index_offset,
                         int page_offset);
  const TemplateURLRef* suggestions_url() const {
    if (suggestions_url_.url().empty())
      return NULL;
    return &suggestions_url_;
  }

  // Parameterized URL for providing the results. This may be NULL.
  // Be sure and check the resulting TemplateURLRef for SupportsReplacement
  // before using.
  void SetURL(const std::wstring& url, int index_offset, int page_offset);
  // Returns the TemplateURLRef that may be used for search results. This
  // returns NULL if a url element was not specified.
  const TemplateURLRef* url() const {
    if (url_.url().empty())
      return NULL;
    return &url_;
  }

  // URL to the OSD file this came from. May be empty.
  void set_originating_url(const GURL& url) {
    originating_url_ = url;
  }
  const GURL& originating_url() const { return originating_url_; }

  // The shortcut for this template url. May be empty.
  void set_keyword(const std::wstring& keyword);
  const std::wstring& keyword() const;

  // Whether to autogenerate a keyword from the url() in GetKeyword().  Most
  // consumers should not need this.
  // NOTE: Calling set_keyword() turns this back off.  Manual and automatic
  // keywords are mutually exclusive.
  void set_autogenerate_keyword(bool autogenerate_keyword) {
    autogenerate_keyword_ = autogenerate_keyword;
    if (autogenerate_keyword_)
      keyword_.clear();
  }
  bool autogenerate_keyword() const {
    return autogenerate_keyword_;
  }

  // Whether this keyword is shown in the default list of search providers. This
  // is just a property and does not indicate whether this TemplateURL has
  // a TemplateURLRef that supports replacement. Use ShowInDefaultList to
  // test both.
  // The default value is false.
  void set_show_in_default_list(bool show_in_default_list) {
    show_in_default_list_ = show_in_default_list;
  }
  bool show_in_default_list() const { return show_in_default_list_; }

  // Returns true if show_in_default_list() is true and this TemplateURL has a
  // TemplateURLRef that supports replacement.
  bool ShowInDefaultList() const;

  // Whether it's safe for auto-modification code (the autogenerator and the
  // code that imports data from other browsers) to replace the TemplateURL.
  // This should be set to false for any keyword the user edits, or any keyword
  // that the user clearly manually edited in the past, like a bookmark keyword
  // from another browser.
  void set_safe_for_autoreplace(bool safe_for_autoreplace) {
    safe_for_autoreplace_ = safe_for_autoreplace;
  }
  bool safe_for_autoreplace() const { return safe_for_autoreplace_; }

  // Images for this URL. May be empty.
  void add_image_ref(const ImageRef& ref) { image_refs_.push_back(ref); }
  const std::vector<ImageRef>& image_refs() const { return image_refs_; }

  // Convenience methods for getting/setting an ImageRef that points to a
  // favicon. A TemplateURL need not have an ImageRef for a favicon. In such
  // a situation GetFavIconURL returns an invalid url.
  //
  // If url is empty and there is an image ref for a favicon, it is removed.
  void SetFavIconURL(const GURL& url);
  GURL GetFavIconURL() const;

  // Set of languages supported. This may be empty.
  void add_language(const std::wstring& language) {
    languages_.push_back(language);
  }
  const std::vector<std::wstring>& languages() const { return languages_; }

  // Date this keyword was created.
  //
  // NOTE: this may be 0, which indicates the keyword was created before we
  // started tracking creation time.
  void set_date_created(base::Time time) { date_created_ = time; }
  base::Time date_created() const { return date_created_; }

  // Number of times this keyword has been explicitly used to load a URL.  We
  // don't increment this for uses as the "default search engine" since that's
  // not really "explicit" usage and incrementing would result in pinning the
  // user's default search engine(s) to the top of the list of searches on the
  // New Tab page, de-emphasizing the omnibox as "where you go to search".
  void set_usage_count(int count) { usage_count_ = count; }
  int usage_count() const { return usage_count_; }

  // The list of supported encodings for the search terms. This may be empty,
  // which indicates the terms should be encoded with UTF-8.
  void set_input_encodings(const std::vector<std::string>& encodings) {
    input_encodings_ = encodings;
  }
  void add_input_encoding(const std::string& encoding) {
    input_encodings_.push_back(encoding);
  }
  const std::vector<std::string>& input_encodings() const {
    return input_encodings_;
  }

  // Returns the unique identifier of this TemplateURL. The unique ID is set
  // by the TemplateURLModel when the TemplateURL is added to it.
  IDType id() const { return id_; }

  // If this TemplateURL comes from prepopulated data the prepopulate_id is > 0.
  void set_prepopulate_id(int id) { prepopulate_id_ = id; }
  int prepopulate_id() const { return prepopulate_id_; }

 private:
  friend class WebDatabaseTest;
  friend class WebDatabase;
  friend class TemplateURLModel;

  // Invalidates cached values on this object and its child TemplateURLRefs.
  void InvalidateCachedValues() const;

  // Unique identifier, used when archived to the database.
  void set_id(IDType id) { id_ = id;}

  std::wstring short_name_;
  std::wstring description_;
  TemplateURLRef suggestions_url_;
  TemplateURLRef url_;
  GURL originating_url_;
  mutable std::wstring keyword_;
  bool autogenerate_keyword_;  // If this is set, |keyword_| holds the cached
                               // generated keyword if available.
  bool show_in_default_list_;
  bool safe_for_autoreplace_;
  std::vector<ImageRef> image_refs_;
  std::vector<std::wstring> languages_;
  // List of supported input encodings.
  std::vector<std::string> input_encodings_;
  IDType id_;
  base::Time date_created_;
  int usage_count_;
  int prepopulate_id_;

  // TODO(sky): Add date last parsed OSD file.
};

#endif  // CHROME_BROWSER_SEARCH_ENGINES_TEMPLATE_URL_H_

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