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- // Copyright 2015 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.
- #include "components/url_formatter/url_formatter.h"
- #include <algorithm>
- #include <ostream>
- #include <utility>
- #include <vector>
- #include "base/lazy_instance.h"
- #include "base/memory/raw_ptr.h"
- #include "base/numerics/safe_conversions.h"
- #include "base/strings/strcat.h"
- #include "base/strings/string_piece.h"
- #include "base/strings/string_util.h"
- #include "base/strings/utf_offset_string_conversions.h"
- #include "base/strings/utf_string_conversions.h"
- #include "base/threading/thread_local_storage.h"
- #include "build/build_config.h"
- #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
- #include "third_party/icu/source/common/unicode/uidna.h"
- #include "third_party/icu/source/common/unicode/utypes.h"
- #include "url/gurl.h"
- #include "url/third_party/mozilla/url_parse.h"
- #include "url/url_constants.h"
- #include "url/url_util.h"
- namespace url_formatter {
- namespace {
- const char kWww[] = "www.";
- constexpr size_t kWwwLength = 4;
- const char kMobilePrefix[] = "m.";
- constexpr size_t kMobilePrefixLength = 2;
- IDNConversionResult IDNToUnicodeWithAdjustments(
- base::StringPiece host,
- base::OffsetAdjuster::Adjustments* adjustments);
- // Result of converting a single IDN component (i.e. label) to unicode.
- struct ComponentResult {
- // Set to true if the component is converted to unicode.
- bool converted = false;
- // Set to true if the component is IDN, even if it's not converted to unicode.
- bool has_idn_component = false;
- // Result of the IDN spoof check.
- IDNSpoofChecker::Result spoof_check_result = IDNSpoofChecker::Result::kNone;
- };
- ComponentResult IDNToUnicodeOneComponent(
- base::StringPiece16 comp,
- base::StringPiece top_level_domain,
- base::StringPiece16 top_level_domain_unicode,
- bool ignore_spoof_check_results,
- std::u16string* out);
- class AppendComponentTransform {
- public:
- AppendComponentTransform() = default;
- virtual ~AppendComponentTransform() = default;
- virtual std::u16string Execute(
- const std::string& component_text,
- base::OffsetAdjuster::Adjustments* adjustments) const = 0;
- // NOTE: No DISALLOW_COPY_AND_ASSIGN here, since gcc < 4.3.0 requires an
- // accessible copy constructor in order to call AppendFormattedComponent()
- // with an inline temporary (see http://gcc.gnu.org/bugs/#cxx%5Frvalbind ).
- };
- class HostComponentTransform : public AppendComponentTransform {
- public:
- HostComponentTransform(bool trim_trivial_subdomains, bool trim_mobile_prefix)
- : trim_trivial_subdomains_(trim_trivial_subdomains),
- trim_mobile_prefix_(trim_mobile_prefix) {}
- private:
- std::u16string Execute(
- const std::string& component_text,
- base::OffsetAdjuster::Adjustments* adjustments) const override {
- // Nothing to change.
- if (!trim_trivial_subdomains_ && !trim_mobile_prefix_)
- return IDNToUnicodeWithAdjustments(component_text, adjustments).result;
- std::string stripped_component_text = component_text;
- if (base::StartsWith(component_text, "www.m.") &&
- trim_trivial_subdomains_ && trim_mobile_prefix_) {
- stripped_component_text = StripWWW(stripped_component_text);
- stripped_component_text = StripMobilePrefix(stripped_component_text);
- } else if (base::StartsWith(component_text, "m.www.") &&
- trim_mobile_prefix_ && trim_trivial_subdomains_) {
- stripped_component_text = StripMobilePrefix(stripped_component_text);
- stripped_component_text = StripWWW(stripped_component_text);
- } else {
- if (trim_trivial_subdomains_) {
- stripped_component_text = StripWWW(component_text);
- }
- if (trim_mobile_prefix_) {
- stripped_component_text = StripMobilePrefix(stripped_component_text);
- }
- }
- // If StripWWW() and StripMobilePrefix() did nothing, then "www." and "m."
- // weren't a prefix, or it otherwise didn't meet conditions for stripping
- // "www." (such as intranet hostnames). In this case, no adjustments for
- // trivial subdomains are needed.
- if (stripped_component_text == component_text)
- return IDNToUnicodeWithAdjustments(component_text, adjustments).result;
- base::OffsetAdjuster::Adjustments offset_adjustments;
- if (component_text.length() ==
- stripped_component_text.length() + kMobilePrefixLength + kWwwLength) {
- // Add www. and m. offsets.
- offset_adjustments.push_back(
- base::OffsetAdjuster::Adjustment(0, kWwwLength, 0));
- offset_adjustments.push_back(
- base::OffsetAdjuster::Adjustment(0, kMobilePrefixLength, 0));
- } else if (component_text.length() ==
- stripped_component_text.length() + kWwwLength) {
- // Add www. offset.
- offset_adjustments.push_back(
- base::OffsetAdjuster::Adjustment(0, kWwwLength, 0));
- } else if (component_text.length() ==
- stripped_component_text.length() + kMobilePrefixLength) {
- // Add m. offset
- offset_adjustments.push_back(
- base::OffsetAdjuster::Adjustment(0, kMobilePrefixLength, 0));
- }
- std::u16string unicode_result =
- IDNToUnicodeWithAdjustments(stripped_component_text, adjustments)
- .result;
- base::OffsetAdjuster::MergeSequentialAdjustments(offset_adjustments,
- adjustments);
- return unicode_result;
- }
- bool trim_trivial_subdomains_;
- bool trim_mobile_prefix_;
- };
- class NonHostComponentTransform : public AppendComponentTransform {
- public:
- explicit NonHostComponentTransform(base::UnescapeRule::Type unescape_rules)
- : unescape_rules_(unescape_rules) {}
- private:
- std::u16string Execute(
- const std::string& component_text,
- base::OffsetAdjuster::Adjustments* adjustments) const override {
- return (unescape_rules_ == base::UnescapeRule::NONE)
- ? base::UTF8ToUTF16WithAdjustments(component_text, adjustments)
- : base::UnescapeAndDecodeUTF8URLComponentWithAdjustments(
- component_text, unescape_rules_, adjustments);
- }
- const base::UnescapeRule::Type unescape_rules_;
- };
- // Transforms the portion of |spec| covered by |original_component| according to
- // |transform|. Appends the result to |output|. If |output_component| is
- // non-NULL, its start and length are set to the transformed component's new
- // start and length. If |adjustments| is non-NULL, appends adjustments (if
- // any) that reflect the transformation the original component underwent to
- // become the transformed value appended to |output|.
- void AppendFormattedComponent(const std::string& spec,
- const url::Component& original_component,
- const AppendComponentTransform& transform,
- std::u16string* output,
- url::Component* output_component,
- base::OffsetAdjuster::Adjustments* adjustments) {
- DCHECK(output);
- if (original_component.is_nonempty()) {
- size_t original_component_begin =
- static_cast<size_t>(original_component.begin);
- size_t output_component_begin = output->length();
- std::string component_str(spec, original_component_begin,
- static_cast<size_t>(original_component.len));
- // Transform |component_str| and modify |adjustments| appropriately.
- base::OffsetAdjuster::Adjustments component_transform_adjustments;
- output->append(
- transform.Execute(component_str, &component_transform_adjustments));
- // Shift all the adjustments made for this component so the offsets are
- // valid for the original string and add them to |adjustments|.
- for (auto& component_transform_adjustment :
- component_transform_adjustments) {
- component_transform_adjustment.original_offset +=
- original_component_begin;
- }
- if (adjustments) {
- adjustments->insert(adjustments->end(),
- component_transform_adjustments.begin(),
- component_transform_adjustments.end());
- }
- // Set positions of the parsed component.
- if (output_component) {
- output_component->begin = static_cast<int>(output_component_begin);
- output_component->len =
- static_cast<int>(output->length() - output_component_begin);
- }
- } else if (output_component) {
- output_component->reset();
- }
- }
- // If |component| is valid, its begin is incremented by |delta|.
- void AdjustComponent(int delta, url::Component* component) {
- if (!component->is_valid())
- return;
- DCHECK(delta >= 0 || component->begin >= -delta);
- component->begin += delta;
- }
- // Adjusts all the components of |parsed| by |delta|, except for the scheme.
- void AdjustAllComponentsButScheme(int delta, url::Parsed* parsed) {
- AdjustComponent(delta, &(parsed->username));
- AdjustComponent(delta, &(parsed->password));
- AdjustComponent(delta, &(parsed->host));
- AdjustComponent(delta, &(parsed->port));
- AdjustComponent(delta, &(parsed->path));
- AdjustComponent(delta, &(parsed->query));
- AdjustComponent(delta, &(parsed->ref));
- }
- // Helper for FormatUrlWithOffsets().
- std::u16string FormatViewSourceUrl(
- const GURL& url,
- FormatUrlTypes format_types,
- base::UnescapeRule::Type unescape_rules,
- url::Parsed* new_parsed,
- size_t* prefix_end,
- base::OffsetAdjuster::Adjustments* adjustments) {
- DCHECK(new_parsed);
- static constexpr base::StringPiece16 kViewSource = u"view-source:";
- // The URL embedded within view-source should never have destructive elisions
- // applied to it. Users of view-source likely want to see the full URL.
- format_types &= ~kFormatUrlOmitHTTPS;
- format_types &= ~kFormatUrlOmitTrivialSubdomains;
- format_types &= ~kFormatUrlTrimAfterHost;
- format_types &= ~kFormatUrlOmitFileScheme;
- // Format the underlying URL and record adjustments.
- const std::string& url_str(url.possibly_invalid_spec());
- adjustments->clear();
- std::u16string result = base::StrCat(
- {kViewSource, FormatUrlWithAdjustments(
- GURL(url_str.substr(kViewSource.size())), format_types,
- unescape_rules, new_parsed, prefix_end, adjustments)});
- // Revise |adjustments| by shifting to the offsets to prefix that the above
- // call to FormatUrl didn't get to see.
- for (auto& adjustment : *adjustments)
- adjustment.original_offset += kViewSource.size();
- // Adjust positions of the parsed components.
- if (new_parsed->scheme.is_nonempty()) {
- // Assume "view-source:real-scheme" as a scheme.
- new_parsed->scheme.len += kViewSource.size();
- } else {
- new_parsed->scheme.begin = 0;
- new_parsed->scheme.len = kViewSource.size() - 1;
- }
- AdjustAllComponentsButScheme(kViewSource.size(), new_parsed);
- if (prefix_end)
- *prefix_end += kViewSource.size();
- return result;
- }
- base::LazyInstance<IDNSpoofChecker>::Leaky g_idn_spoof_checker =
- LAZY_INSTANCE_INITIALIZER;
- // Computes the top level domain from |host|. top_level_domain_unicode will
- // contain the unicode version of top_level_domain. top_level_domain_unicode can
- // remain empty if the TLD is not well formed punycode.
- void GetTopLevelDomain(base::StringPiece host,
- base::StringPiece* top_level_domain,
- std::u16string* top_level_domain_unicode) {
- size_t last_dot = host.rfind('.');
- if (last_dot == base::StringPiece::npos)
- return;
- *top_level_domain = host.substr(last_dot + 1);
- std::u16string tld16;
- tld16.reserve(top_level_domain->length());
- tld16.insert(tld16.end(), top_level_domain->begin(), top_level_domain->end());
- // Convert the TLD to unicode, ignoring the spoof check results. This will
- // always decode the input to unicode as long as it's valid punycode.
- IDNToUnicodeOneComponent(tld16, std::string(), std::u16string(),
- /*ignore_spoof_check_results=*/true,
- top_level_domain_unicode);
- }
- IDNConversionResult IDNToUnicodeWithAdjustmentsImpl(
- base::StringPiece host,
- base::OffsetAdjuster::Adjustments* adjustments,
- bool ignore_spoof_check_results) {
- if (adjustments)
- adjustments->clear();
- // Convert the ASCII input to a std::u16string for ICU.
- std::u16string host16;
- host16.reserve(host.length());
- host16.insert(host16.end(), host.begin(), host.end());
- // Compute the top level domain to be used in spoof checks later.
- base::StringPiece top_level_domain;
- std::u16string top_level_domain_unicode;
- GetTopLevelDomain(host, &top_level_domain, &top_level_domain_unicode);
- IDNConversionResult result;
- // Do each component of the host separately, since we enforce script matching
- // on a per-component basis.
- std::u16string out16;
- for (size_t component_start = 0, component_end;
- component_start < host16.length(); component_start = component_end + 1) {
- // Find the end of the component.
- component_end = host16.find('.', component_start);
- if (component_end == std::u16string::npos)
- component_end = host16.length(); // For getting the last component.
- size_t component_length = component_end - component_start;
- size_t new_component_start = out16.length();
- ComponentResult component_result;
- if (component_end > component_start) {
- // Add the substring that we just found.
- component_result = IDNToUnicodeOneComponent(
- {host16.data() + component_start, component_length}, top_level_domain,
- top_level_domain_unicode, ignore_spoof_check_results, &out16);
- result.has_idn_component |= component_result.has_idn_component;
- if (component_result.spoof_check_result !=
- IDNSpoofChecker::Result::kNone &&
- (result.spoof_check_result == IDNSpoofChecker::Result::kNone ||
- result.spoof_check_result == IDNSpoofChecker::Result::kSafe)) {
- result.spoof_check_result = component_result.spoof_check_result;
- }
- }
- size_t new_component_length = out16.length() - new_component_start;
- if (component_result.converted && adjustments) {
- adjustments->push_back(base::OffsetAdjuster::Adjustment(
- component_start, component_length, new_component_length));
- }
- // Need to add the dot we just found (if we found one).
- if (component_end < host16.length())
- out16.push_back('.');
- }
- result.result = out16;
- // Leave as punycode any inputs that spoof top domains.
- if (result.has_idn_component) {
- result.matching_top_domain =
- g_idn_spoof_checker.Get().GetSimilarTopDomain(out16);
- if (!ignore_spoof_check_results &&
- !result.matching_top_domain.domain.empty()) {
- if (adjustments)
- adjustments->clear();
- result.result = host16;
- }
- }
- return result;
- }
- // TODO(brettw): We may want to skip this step in the case of file URLs to
- // allow unicode UNC hostnames regardless of encodings.
- IDNConversionResult IDNToUnicodeWithAdjustments(
- base::StringPiece host,
- base::OffsetAdjuster::Adjustments* adjustments) {
- return IDNToUnicodeWithAdjustmentsImpl(host, adjustments,
- /*ignore_spoof_check_results=*/false);
- }
- IDNConversionResult UnsafeIDNToUnicodeWithAdjustments(
- base::StringPiece host,
- base::OffsetAdjuster::Adjustments* adjustments) {
- return IDNToUnicodeWithAdjustmentsImpl(host, adjustments,
- /*ignore_spoof_check_results=*/true);
- }
- // Returns true if the given Unicode host component is safe to display to the
- // user. Note that this function does not deal with pure ASCII domain labels at
- // all even though it's possible to make up look-alike labels with ASCII
- // characters alone.
- IDNSpoofChecker::Result SpoofCheckIDNComponent(
- base::StringPiece16 label,
- base::StringPiece top_level_domain,
- base::StringPiece16 top_level_domain_unicode) {
- return g_idn_spoof_checker.Get().SafeToDisplayAsUnicode(
- label, top_level_domain, top_level_domain_unicode);
- }
- // A wrapper to use LazyInstance<>::Leaky with ICU's UIDNA, a C pointer to
- // a UTS46/IDNA 2008 handling object opened with uidna_openUTS46().
- //
- // We use UTS46 with BiDiCheck to migrate from IDNA 2003 to IDNA 2008 with the
- // backward compatibility in mind. What it does:
- //
- // 1. Use the up-to-date Unicode data.
- // 2. Define a case folding/mapping with the up-to-date Unicode data as in
- // IDNA 2003.
- // 3. Use transitional mechanism for 4 deviation characters (sharp-s,
- // final sigma, ZWJ and ZWNJ) for now.
- // 4. Continue to allow symbols and punctuations.
- // 5. Apply new BiDi check rules more permissive than the IDNA 2003 BiDI rules.
- // 6. Do not apply STD3 rules
- // 7. Do not allow unassigned code points.
- //
- // It also closely matches what IE 10 does except for the BiDi check (
- // http://goo.gl/3XBhqw ).
- // See http://http://unicode.org/reports/tr46/ and references therein/ for more
- // details.
- struct UIDNAWrapper {
- UIDNAWrapper() {
- UErrorCode err = U_ZERO_ERROR;
- // TODO(jungshik): Change options as different parties (browsers,
- // registrars, search engines) converge toward a consensus.
- value = uidna_openUTS46(UIDNA_CHECK_BIDI, &err);
- CHECK(U_SUCCESS(err)) << "failed to open UTS46 data with error: "
- << u_errorName(err)
- << ". If you see this error message in a test "
- << "environment your test environment likely lacks "
- << "the required data tables for libicu. See "
- << "https://crbug.com/778929.";
- }
- raw_ptr<UIDNA> value;
- };
- base::LazyInstance<UIDNAWrapper>::Leaky g_uidna = LAZY_INSTANCE_INITIALIZER;
- // Converts one component (label) of a host (between dots) to Unicode if safe.
- // If |ignore_spoof_check_results| is true and input is valid unicode, ignores
- // spoof check results and always converts the input to unicode. The result will
- // be APPENDED to the given output string and will be the same as the input if
- // it is not IDN in ACE/punycode or the IDN is unsafe to display. Returns true
- // if conversion was made. Sets |has_idn_component| to true if the input has
- // IDN, regardless of whether it was converted to unicode or not.
- ComponentResult IDNToUnicodeOneComponent(
- base::StringPiece16 comp,
- base::StringPiece top_level_domain,
- base::StringPiece16 top_level_domain_unicode,
- bool ignore_spoof_check_results,
- std::u16string* out) {
- DCHECK(out);
- ComponentResult result;
- if (comp.empty())
- return result;
- // Early return if the input cannot be an IDN component.
- // Valid punycode must not end with a dash.
- static constexpr char16_t kIdnPrefix[] = u"xn--";
- if (!base::StartsWith(comp, kIdnPrefix) || comp.back() == '-') {
- out->append(comp.data(), comp.size());
- return result;
- }
- UIDNA* uidna = g_uidna.Get().value;
- DCHECK(uidna != nullptr);
- size_t original_length = out->length();
- int32_t output_length = 64;
- UIDNAInfo info = UIDNA_INFO_INITIALIZER;
- UErrorCode status;
- do {
- out->resize(original_length + output_length);
- status = U_ZERO_ERROR;
- // This returns the actual length required. If this is more than 64
- // code units, |status| will be U_BUFFER_OVERFLOW_ERROR and we'll try
- // the conversion again, but with a sufficiently large buffer.
- output_length = uidna_labelToUnicode(
- uidna, comp.data(), static_cast<int32_t>(comp.size()),
- &(*out)[original_length], output_length, &info, &status);
- } while ((status == U_BUFFER_OVERFLOW_ERROR && info.errors == 0));
- if (U_SUCCESS(status) && info.errors == 0) {
- result.has_idn_component = true;
- // Converted successfully. At this point the length of the output string
- // is original_length + output_length which may be shorter than the current
- // length of |out|. Trim |out| and ensure that the converted component can
- // be safely displayed to the user.
- out->resize(original_length + output_length);
- result.spoof_check_result = SpoofCheckIDNComponent(
- base::StringPiece16(out->data() + original_length,
- base::checked_cast<size_t>(output_length)),
- top_level_domain, top_level_domain_unicode);
- DCHECK_NE(IDNSpoofChecker::Result::kNone, result.spoof_check_result);
- if (ignore_spoof_check_results ||
- result.spoof_check_result == IDNSpoofChecker::Result::kSafe) {
- result.converted = true;
- return result;
- }
- }
- // We get here with no IDN or on error, in which case we just revert to
- // original string and append the literal input.
- out->resize(original_length);
- out->append(comp.data(), comp.size());
- return result;
- }
- // Returns true iff URL-parsing `spec` would reveal that it has the
- // "view-source" scheme, and that parsing the spec minus that scheme also has
- // the "view-source" scheme.
- bool HasTwoViewSourceSchemes(base::StringPiece spec) {
- static constexpr char kViewSource[] = "view-source";
- url::Component scheme;
- if (!url::FindAndCompareScheme(spec.data(),
- base::checked_cast<int>(spec.size()),
- kViewSource, &scheme)) {
- return false;
- }
- // Consume the scheme.
- spec.remove_prefix(scheme.begin + scheme.len);
- // Consume the trailing colon. If it's not there, then `spec` didn't really
- // have the first view-source scheme.
- if (spec.empty() || spec[0] != ':')
- return false;
- spec.remove_prefix(1);
- return url::FindAndCompareScheme(
- spec.data(), base::checked_cast<int>(spec.size()), kViewSource, &scheme);
- }
- } // namespace
- const FormatUrlType kFormatUrlOmitNothing = 0;
- const FormatUrlType kFormatUrlOmitUsernamePassword = 1 << 0;
- const FormatUrlType kFormatUrlOmitHTTP = 1 << 1;
- const FormatUrlType kFormatUrlOmitTrailingSlashOnBareHostname = 1 << 2;
- const FormatUrlType kFormatUrlOmitHTTPS = 1 << 3;
- const FormatUrlType kFormatUrlOmitTrivialSubdomains = 1 << 5;
- const FormatUrlType kFormatUrlTrimAfterHost = 1 << 6;
- const FormatUrlType kFormatUrlOmitFileScheme = 1 << 7;
- const FormatUrlType kFormatUrlOmitMailToScheme = 1 << 8;
- const FormatUrlType kFormatUrlOmitMobilePrefix = 1 << 9;
- const FormatUrlType kFormatUrlOmitDefaults =
- kFormatUrlOmitUsernamePassword | kFormatUrlOmitHTTP |
- kFormatUrlOmitTrailingSlashOnBareHostname;
- std::u16string FormatUrl(const GURL& url,
- FormatUrlTypes format_types,
- base::UnescapeRule::Type unescape_rules,
- url::Parsed* new_parsed,
- size_t* prefix_end,
- size_t* offset_for_adjustment) {
- base::OffsetAdjuster::Adjustments adjustments;
- std::u16string result = FormatUrlWithAdjustments(
- url, format_types, unescape_rules, new_parsed, prefix_end, &adjustments);
- if (offset_for_adjustment) {
- base::OffsetAdjuster::AdjustOffset(adjustments, offset_for_adjustment,
- result.length());
- }
- return result;
- }
- std::u16string FormatUrlWithOffsets(
- const GURL& url,
- FormatUrlTypes format_types,
- base::UnescapeRule::Type unescape_rules,
- url::Parsed* new_parsed,
- size_t* prefix_end,
- std::vector<size_t>* offsets_for_adjustment) {
- base::OffsetAdjuster::Adjustments adjustments;
- const std::u16string& result = FormatUrlWithAdjustments(
- url, format_types, unescape_rules, new_parsed, prefix_end, &adjustments);
- base::OffsetAdjuster::AdjustOffsets(adjustments, offsets_for_adjustment,
- result.length());
- return result;
- }
- std::u16string FormatUrlWithAdjustments(
- const GURL& url,
- FormatUrlTypes format_types,
- base::UnescapeRule::Type unescape_rules,
- url::Parsed* new_parsed,
- size_t* prefix_end,
- base::OffsetAdjuster::Adjustments* adjustments) {
- DCHECK(adjustments);
- adjustments->clear();
- url::Parsed parsed_temp;
- if (!new_parsed)
- new_parsed = &parsed_temp;
- else
- *new_parsed = url::Parsed();
- // Special handling for view-source:. Don't use content::kViewSourceScheme
- // because this library shouldn't depend on chrome. Reject repeated
- // view-source schemes to avoid recursion.
- static constexpr base::StringPiece kViewSource = "view-source";
- if (url.SchemeIs(kViewSource) &&
- !HasTwoViewSourceSchemes(url.possibly_invalid_spec())) {
- return FormatViewSourceUrl(url, format_types, unescape_rules, new_parsed,
- prefix_end, adjustments);
- }
- // We handle both valid and invalid URLs (this will give us the spec
- // regardless of validity).
- const std::string& spec = url.possibly_invalid_spec();
- const url::Parsed& parsed = url.parsed_for_possibly_invalid_spec();
- // Scheme & separators. These are ASCII.
- size_t scheme_size = static_cast<size_t>(parsed.CountCharactersBefore(
- url::Parsed::USERNAME, true /* include_delimiter */));
- std::u16string url_string;
- url_string.insert(url_string.end(), spec.begin(), spec.begin() + scheme_size);
- new_parsed->scheme = parsed.scheme;
- // Username & password.
- if (((format_types & kFormatUrlOmitUsernamePassword) != 0) ||
- ((format_types & kFormatUrlTrimAfterHost) != 0)) {
- // Remove the username and password fields. We don't want to display those
- // to the user since they can be used for attacks,
- // e.g. "http://google.com:search@evil.ru/"
- new_parsed->username.reset();
- new_parsed->password.reset();
- // Update the adjustments based on removed username and/or password.
- if (parsed.username.is_nonempty() || parsed.password.is_nonempty()) {
- if (parsed.username.is_nonempty() && parsed.password.is_nonempty()) {
- // The seeming off-by-two is to account for the ':' after the username
- // and '@' after the password.
- adjustments->push_back(base::OffsetAdjuster::Adjustment(
- static_cast<size_t>(parsed.username.begin),
- static_cast<size_t>(parsed.username.len + parsed.password.len + 2),
- 0));
- } else {
- const url::Component* nonempty_component =
- parsed.username.is_nonempty() ? &parsed.username : &parsed.password;
- // The seeming off-by-one is to account for the '@' after the
- // username/password.
- adjustments->push_back(base::OffsetAdjuster::Adjustment(
- static_cast<size_t>(nonempty_component->begin),
- static_cast<size_t>(nonempty_component->len + 1), 0));
- }
- }
- } else {
- AppendFormattedComponent(spec, parsed.username,
- NonHostComponentTransform(unescape_rules),
- &url_string, &new_parsed->username, adjustments);
- if (parsed.password.is_valid())
- url_string.push_back(':');
- AppendFormattedComponent(spec, parsed.password,
- NonHostComponentTransform(unescape_rules),
- &url_string, &new_parsed->password, adjustments);
- if (parsed.username.is_valid() || parsed.password.is_valid())
- url_string.push_back('@');
- }
- if (prefix_end)
- *prefix_end = static_cast<size_t>(url_string.length());
- // Host.
- bool trim_trivial_subdomains =
- (format_types & kFormatUrlOmitTrivialSubdomains) != 0;
- bool trim_mobile_prefix = (format_types & kFormatUrlOmitMobilePrefix) != 0;
- AppendFormattedComponent(
- spec, parsed.host,
- HostComponentTransform(trim_trivial_subdomains, trim_mobile_prefix),
- &url_string, &new_parsed->host, adjustments);
- // Port.
- if (parsed.port.is_nonempty()) {
- url_string.push_back(':');
- new_parsed->port.begin = url_string.length();
- url_string.insert(url_string.end(), spec.begin() + parsed.port.begin,
- spec.begin() + parsed.port.end());
- new_parsed->port.len = url_string.length() - new_parsed->port.begin;
- } else {
- new_parsed->port.reset();
- }
- // Path & query. Both get the same general unescape & convert treatment.
- if ((format_types & kFormatUrlTrimAfterHost) && url.IsStandard() &&
- !url.SchemeIsFile() && !url.SchemeIsFileSystem()) {
- size_t trimmed_length = parsed.path.len;
- // Remove query and the '?' delimeter.
- if (parsed.query.is_valid())
- trimmed_length += parsed.query.len + 1;
- // Remove ref and the '#" delimiter.
- if (parsed.ref.is_valid())
- trimmed_length += parsed.ref.len + 1;
- adjustments->push_back(
- base::OffsetAdjuster::Adjustment(parsed.path.begin, trimmed_length, 0));
- } else if ((format_types & kFormatUrlOmitTrailingSlashOnBareHostname) &&
- CanStripTrailingSlash(url)) {
- // Omit the path, which is a single trailing slash. There's no query or ref.
- if (parsed.path.len > 0) {
- adjustments->push_back(base::OffsetAdjuster::Adjustment(
- parsed.path.begin, parsed.path.len, 0));
- }
- } else {
- // Append the formatted path, query, and ref.
- AppendFormattedComponent(spec, parsed.path,
- NonHostComponentTransform(unescape_rules),
- &url_string, &new_parsed->path, adjustments);
- if (parsed.query.is_valid())
- url_string.push_back('?');
- AppendFormattedComponent(spec, parsed.query,
- NonHostComponentTransform(unescape_rules),
- &url_string, &new_parsed->query, adjustments);
- if (parsed.ref.is_valid())
- url_string.push_back('#');
- AppendFormattedComponent(spec, parsed.ref,
- NonHostComponentTransform(unescape_rules),
- &url_string, &new_parsed->ref, adjustments);
- }
- // url_formatter::FixupURL() treats "ftp.foo.com" as ftp://ftp.foo.com. This
- // means that if we trim the scheme off a URL whose host starts with "ftp."
- // and the user inputs this into any field subject to fixup (which is
- // basically all input fields), the meaning would be changed. (In fact, often
- // the formatted URL is directly pre-filled into an input field.) For this
- // reason we avoid stripping schemes in this case.
- const char kFTP[] = "ftp.";
- bool strip_scheme =
- !base::StartsWith(url.host(), kFTP, base::CompareCase::SENSITIVE) &&
- (((format_types & kFormatUrlOmitHTTP) &&
- url.SchemeIs(url::kHttpScheme)) ||
- ((format_types & kFormatUrlOmitHTTPS) &&
- url.SchemeIs(url::kHttpsScheme)) ||
- ((format_types & kFormatUrlOmitFileScheme) &&
- url.SchemeIs(url::kFileScheme)) ||
- ((format_types & kFormatUrlOmitMailToScheme) &&
- url.SchemeIs(url::kMailToScheme)));
- // If we need to strip out schemes do it after the fact.
- if (strip_scheme) {
- DCHECK(new_parsed->scheme.is_valid());
- size_t scheme_and_separator_len =
- url.SchemeIs(url::kMailToScheme)
- ? new_parsed->scheme.len + 1 // +1 for :.
- : new_parsed->scheme.len + 3; // +3 for ://.
- #if BUILDFLAG(IS_WIN)
- // Because there's an additional leading slash after the scheme for local
- // files on Windows, we should remove it for URL display when eliding
- // the scheme by offsetting by an additional character.
- if (url.SchemeIs(url::kFileScheme) &&
- base::StartsWith(url_string, u"file:///",
- base::CompareCase::INSENSITIVE_ASCII)) {
- ++new_parsed->path.begin;
- ++scheme_size;
- ++scheme_and_separator_len;
- }
- #endif
- url_string.erase(0, scheme_size);
- // Because offsets in the |adjustments| are already calculated with respect
- // to the string with the http:// prefix in it, those offsets remain correct
- // after stripping the prefix. The only thing necessary is to add an
- // adjustment to reflect the stripped prefix.
- adjustments->insert(adjustments->begin(),
- base::OffsetAdjuster::Adjustment(0, scheme_size, 0));
- if (prefix_end)
- *prefix_end -= scheme_size;
- // Adjust new_parsed.
- new_parsed->scheme.reset();
- AdjustAllComponentsButScheme(-scheme_and_separator_len, new_parsed);
- }
- return url_string;
- }
- bool CanStripTrailingSlash(const GURL& url) {
- // Omit the path only for standard, non-file URLs with nothing but "/" after
- // the hostname.
- return url.IsStandard() && !url.SchemeIsFile() && !url.SchemeIsFileSystem() &&
- !url.has_query() && !url.has_ref() && url.path_piece() == "/";
- }
- void AppendFormattedHost(const GURL& url, std::u16string* output) {
- AppendFormattedComponent(
- url.possibly_invalid_spec(), url.parsed_for_possibly_invalid_spec().host,
- HostComponentTransform(false, false), output, nullptr, nullptr);
- }
- IDNConversionResult UnsafeIDNToUnicodeWithDetails(base::StringPiece host) {
- return UnsafeIDNToUnicodeWithAdjustments(host, nullptr);
- }
- std::u16string IDNToUnicode(base::StringPiece host) {
- return IDNToUnicodeWithAdjustments(host, nullptr).result;
- }
- std::string StripWWW(const std::string& text) {
- // Exclude the registry and domain from trivial subdomain stripping.
- std::string domain_and_registry =
- net::registry_controlled_domains::GetDomainAndRegistry(
- text, net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES);
- // If there is no domain and registry, we may be looking at an intranet
- // or otherwise non-standard host. Leave those alone.
- if (domain_and_registry.empty())
- return text;
- return text.size() - domain_and_registry.length() >= kWwwLength &&
- base::StartsWith(text, kWww, base::CompareCase::SENSITIVE)
- ? text.substr(kWwwLength)
- : text;
- }
- void StripWWWFromHostComponent(const std::string& url, url::Component* host) {
- std::string host_str = url.substr(host->begin, host->len);
- if (StripWWW(host_str) == host_str)
- return;
- host->begin += kWwwLength;
- host->len -= kWwwLength;
- }
- std::string StripMobilePrefix(const std::string& text) {
- return text.size() >= kMobilePrefixLength &&
- base::StartsWith(text, kMobilePrefix,
- base::CompareCase::SENSITIVE)
- ? text.substr(kMobilePrefixLength)
- : text;
- }
- Skeletons GetSkeletons(const std::u16string& host) {
- return g_idn_spoof_checker.Get().GetSkeletons(host);
- }
- TopDomainEntry LookupSkeletonInTopDomains(const std::string& skeleton,
- const SkeletonType type) {
- return g_idn_spoof_checker.Get().LookupSkeletonInTopDomains(skeleton, type);
- }
- std::u16string MaybeRemoveDiacritics(const std::u16string& host) {
- return g_idn_spoof_checker.Get().MaybeRemoveDiacritics(host);
- }
- } // namespace url_formatter
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