content/renderer/android/email_detector.cc

   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 "content/renderer/android/email_detector.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/strings/utf_string_conversions.h"
  10 #include "content/public/renderer/android_content_detection_prefixes.h"
  11 #include "net/base/escape.h"
  12 #include "third_party/icu/source/i18n/unicode/regex.h"
  13
  14 namespace {
  15
  16 // Maximum length of an email address.
  17 const size_t kMaximumEmailLength = 254;
  18
  19 // Regex to match email addresses.
  20 // This is more specific than RFC 2822 (uncommon special characters are
  21 // disallowed) in order to avoid false positives.
  22 // Delimiters are word boundaries to allow punctuation, quote marks etc. around
  23 // the address.
  24 const char kEmailRegex[] = "\\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}\\b";
  25
  26 }  // anonymous namespace
  27
  28 namespace content {
  29
  30 EmailDetector::EmailDetector() {
  31 }
  32
  33 size_t EmailDetector::GetMaximumContentLength() {
  34   return kMaximumEmailLength;
  35 }
  36
  37 GURL EmailDetector::GetIntentURL(const std::string& content_text) {
  38   if (content_text.empty())
  39     return GURL();
  40
  41   return GURL(kEmailPrefix +
  42       net::EscapeQueryParamValue(content_text, true));
  43 }
  44
  45 bool EmailDetector::FindContent(const base::string16::const_iterator& begin,
  46                                 const base::string16::const_iterator& end,
  47                                 size_t* start_pos,
  48                                 size_t* end_pos,
  49                                 std::string* content_text) {
  50   base::string16 utf16_input = base::string16(begin, end);
  51   icu::UnicodeString pattern(kEmailRegex);
  52   icu::UnicodeString input(utf16_input.data(), utf16_input.length());
  53   UErrorCode status = U_ZERO_ERROR;
  54   scoped_ptr<icu::RegexMatcher> matcher(
  55       new icu::RegexMatcher(pattern,
  56                             input,
  57                             UREGEX_CASE_INSENSITIVE,
  58                             status));
  59   if (matcher->find()) {
  60     *start_pos = matcher->start(status);
  61     DCHECK(U_SUCCESS(status));
  62     *end_pos = matcher->end(status);
  63     DCHECK(U_SUCCESS(status));
  64     icu::UnicodeString content_ustr(matcher->group(status));
  65     DCHECK(U_SUCCESS(status));
  66     base::UTF16ToUTF8(content_ustr.getBuffer(), content_ustr.length(),
  67         content_text);
  68     return true;
  69   }
  70
  71   return false;
  72 }
  73
  74 }  // namespace content