history_provider.cc revision 58537e28ecd584eab876aee8be7156509866d23a 
1// Copyright (c) 2012 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#include "chrome/browser/autocomplete/history_provider.h"
6
7#include <string>
8
9#include "base/strings/string_util.h"
10#include "base/strings/utf_string_conversions.h"
11#include "chrome/browser/autocomplete/autocomplete_input.h"
12#include "chrome/browser/autocomplete/autocomplete_match.h"
13#include "chrome/browser/autocomplete/autocomplete_provider_listener.h"
14#include "chrome/browser/history/history_service.h"
15#include "chrome/browser/history/history_service_factory.h"
16#include "chrome/browser/profiles/profile.h"
17#include "chrome/common/net/url_fixer_upper.h"
18#include "chrome/common/url_constants.h"
19#include "url/url_util.h"
20
21HistoryProvider::HistoryProvider(AutocompleteProviderListener* listener,
22                                 Profile* profile,
23                                 AutocompleteProvider::Type type)
24    : AutocompleteProvider(listener, profile, type) {
25}
26
27void HistoryProvider::DeleteMatch(const AutocompleteMatch& match) {
28  DCHECK(done_);
29  DCHECK(profile_);
30  DCHECK(match.deletable);
31
32  HistoryService* const history_service =
33      HistoryServiceFactory::GetForProfile(profile_, Profile::EXPLICIT_ACCESS);
34
35  // Delete the match from the history DB.
36  DCHECK(history_service);
37  DCHECK(match.destination_url.is_valid());
38  history_service->DeleteURL(match.destination_url);
39  DeleteMatchFromMatches(match);
40}
41
42HistoryProvider::~HistoryProvider() {}
43
44void HistoryProvider::DeleteMatchFromMatches(const AutocompleteMatch& match) {
45  bool found = false;
46  for (ACMatches::iterator i(matches_.begin()); i != matches_.end(); ++i) {
47    if (i->destination_url == match.destination_url && i->type == match.type) {
48      found = true;
49      if (i->is_history_what_you_typed_match || i->starred) {
50        // We can't get rid of What-You-Typed or Bookmarked matches,
51        // but we can make them look like they have no backing data.
52        i->deletable = false;
53        i->description.clear();
54        i->description_class.clear();
55      } else {
56        matches_.erase(i);
57      }
58      break;
59    }
60  }
61  DCHECK(found) << "Asked to delete a URL that isn't in our set of matches";
62  listener_->OnProviderUpdate(true);
63}
64
65// static
66bool HistoryProvider::FixupUserInput(AutocompleteInput* input) {
67  const string16& input_text = input->text();
68  // Fixup and canonicalize user input.
69  const GURL canonical_gurl(URLFixerUpper::FixupURL(UTF16ToUTF8(input_text),
70                                                    std::string()));
71  std::string canonical_gurl_str(canonical_gurl.possibly_invalid_spec());
72  if (canonical_gurl_str.empty()) {
73    // This probably won't happen, but there are no guarantees.
74    return false;
75  }
76
77  // If the user types a number, GURL will convert it to a dotted quad.
78  // However, if the parser did not mark this as a URL, then the user probably
79  // didn't intend this interpretation.  Since this can break history matching
80  // for hostname beginning with numbers (e.g. input of "17173" will be matched
81  // against "0.0.67.21" instead of the original "17173", failing to find
82  // "17173.com"), swap the original hostname in for the fixed-up one.
83  if ((input->type() != AutocompleteInput::URL) &&
84      canonical_gurl.HostIsIPAddress()) {
85    std::string original_hostname =
86        UTF16ToUTF8(input_text.substr(input->parts().host.begin,
87                                      input->parts().host.len));
88    const url_parse::Parsed& parts =
89        canonical_gurl.parsed_for_possibly_invalid_spec();
90    // parts.host must not be empty when HostIsIPAddress() is true.
91    DCHECK(parts.host.is_nonempty());
92    canonical_gurl_str.replace(parts.host.begin, parts.host.len,
93                               original_hostname);
94  }
95  string16 output = UTF8ToUTF16(canonical_gurl_str);
96  // Don't prepend a scheme when the user didn't have one.  Since the fixer
97  // upper only prepends the "http" scheme, that's all we need to check for.
98  if (!HasHTTPScheme(input_text))
99    TrimHttpPrefix(&output);
100
101  // Make the number of trailing slashes on the output exactly match the input.
102  // Examples of why not doing this would matter:
103  // * The user types "a" and has this fixed up to "a/".  Now no other sites
104  //   beginning with "a" will match.
105  // * The user types "file:" and has this fixed up to "file://".  Now inline
106  //   autocomplete will append too few slashes, resulting in e.g. "file:/b..."
107  //   instead of "file:///b..."
108  // * The user types "http:/" and has this fixed up to "http:".  Now inline
109  //   autocomplete will append too many slashes, resulting in e.g.
110  //   "http:///c..." instead of "http://c...".
111  // NOTE: We do this after calling TrimHttpPrefix() since that can strip
112  // trailing slashes (if the scheme is the only thing in the input).  It's not
113  // clear that the result of fixup really matters in this case, but there's no
114  // harm in making sure.
115  const size_t last_input_nonslash =
116      input_text.find_last_not_of(ASCIIToUTF16("/\\"));
117  const size_t num_input_slashes = (last_input_nonslash == string16::npos) ?
118      input_text.length() : (input_text.length() - 1 - last_input_nonslash);
119  const size_t last_output_nonslash =
120      output.find_last_not_of(ASCIIToUTF16("/\\"));
121  const size_t num_output_slashes =
122      (last_output_nonslash == string16::npos) ?
123      output.length() : (output.length() - 1 - last_output_nonslash);
124  if (num_output_slashes < num_input_slashes)
125    output.append(num_input_slashes - num_output_slashes, '/');
126  else if (num_output_slashes > num_input_slashes)
127    output.erase(output.length() - num_output_slashes + num_input_slashes);
128
129  url_parse::Parsed parts;
130  URLFixerUpper::SegmentURL(output, &parts);
131  input->UpdateText(output, string16::npos, parts);
132  return !output.empty();
133}
134
135// static
136size_t HistoryProvider::TrimHttpPrefix(string16* url) {
137  // Find any "http:".
138  if (!HasHTTPScheme(*url))
139    return 0;
140  size_t scheme_pos =
141      url->find(ASCIIToUTF16(chrome::kHttpScheme) + char16(':'));
142  DCHECK_NE(string16::npos, scheme_pos);
143
144  // Erase scheme plus up to two slashes.
145  size_t prefix_end = scheme_pos + strlen(chrome::kHttpScheme) + 1;
146  const size_t after_slashes = std::min(url->length(), prefix_end + 2);
147  while ((prefix_end < after_slashes) && ((*url)[prefix_end] == '/'))
148    ++prefix_end;
149  url->erase(scheme_pos, prefix_end - scheme_pos);
150  return (scheme_pos == 0) ? prefix_end : 0;
151}
152
153// static
154bool HistoryProvider::PreventInlineAutocomplete(
155    const AutocompleteInput& input) {
156  return input.prevent_inline_autocomplete() ||
157      (!input.text().empty() &&
158       IsWhitespace(input.text()[input.text().length() - 1]));
159}
160