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chromium / chromium / src / b7743a918d6d7d7c005e07c37aeb0e6912eca3db / . / url / url_idna_icu.cc
blob: 912cb5873aad69541a37f783cf78ee4937721581 [file] [log] [blame]
Avi Drissman3e1a26c2022-09-15 20:26:03[diff] [blame]1// Copyright 2013 The Chromium Authors
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// ICU-based IDNA converter.
6
7#include <stdint.h>
8#include <stdlib.h>
9#include <string.h>
10
Hans Wennborg45feb4ba82020-06-17 16:04:52[diff] [blame]11#include <ostream>
12
Hans Wennborg0e223682020-04-27 21:51:29[diff] [blame]13#include "base/check_op.h"
David Benjamincc4d2b22023-10-02 23:12:04[diff] [blame]14#include "base/numerics/safe_conversions.h"
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]15#include "third_party/icu/source/common/unicode/uidna.h"
16#include "third_party/icu/source/common/unicode/utypes.h"
17#include "url/url_canon_icu.h"
18#include "url/url_canon_internal.h" // for _itoa_s
Mustafa Emre Acer5812f4742022-11-17 20:13:24[diff] [blame]19#include "url/url_features.h"
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]20
21namespace url {
22
Mustafa Emre Acer5812f4742022-11-17 20:13:24[diff] [blame]23namespace {
24
Avi Drissmanded77172021-07-02 18:23:00[diff] [blame]25// Use UIDNA, a C pointer to a UTS46/IDNA 2008 handling object opened with
26// uidna_openUTS46().
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]27//
28// We use UTS46 with BiDiCheck to migrate from IDNA 2003 (with unassigned
Mustafa Emre Acer5812f4742022-11-17 20:13:24[diff] [blame]29// code points allowed) to IDNA 2008 with the backward compatibility in mind.
30// What it does:
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]31//
32// 1. Use the up-to-date Unicode data.
33// 2. Define a case folding/mapping with the up-to-date Unicode data as
34// in IDNA 2003.
Mustafa Emre Acer5812f4742022-11-17 20:13:24[diff] [blame]35// 3. If `use_idna_non_transitional` is true, use non-transitional mechanism for
36// 4 deviation characters (sharp-s, final sigma, ZWJ and ZWNJ) per
37// url.spec.whatwg.org.
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]38// 4. Continue to allow symbols and punctuations.
39// 5. Apply new BiDi check rules more permissive than the IDNA 2003 BiDI rules.
40// 6. Do not apply STD3 rules
41// 7. Do not allow unassigned code points.
42//
43// It also closely matches what IE 10 does except for the BiDi check (
44// http://goo.gl/3XBhqw ).
45// See http://http://unicode.org/reports/tr46/ and references therein
46// for more details.
Mustafa Emre Acer5812f4742022-11-17 20:13:24[diff] [blame]47UIDNA* CreateIDNA(bool use_idna_non_transitional) {
48 uint32_t options = UIDNA_CHECK_BIDI;
49 if (use_idna_non_transitional) {
50 // Use non-transitional processing if enabled. See
51 // https://url.spec.whatwg.org/#idna for details.
52 options |=
53 UIDNA_NONTRANSITIONAL_TO_ASCII | UIDNA_NONTRANSITIONAL_TO_UNICODE;
54 }
55 UErrorCode err = U_ZERO_ERROR;
56 UIDNA* idna = uidna_openUTS46(options, &err);
57 if (U_FAILURE(err)) {
58 CHECK(false) << "failed to open UTS46 data with error: " << u_errorName(err)
59 << ". If you see this error message in a test environment "
60 << "your test environment likely lacks the required data "
61 << "tables for libicu. See https://crbug.com/778929.";
62 idna = nullptr;
63 }
64 return idna;
Victor Vasiliev6a2bb592019-08-19 23:03:17[diff] [blame]65}
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]66
Mustafa Emre Acer5812f4742022-11-17 20:13:24[diff] [blame]67UIDNA* GetUIDNA() {
68 // This logic results in having two UIDNA instances in tests. This is okay.
69 if (IsUsingIDNA2008NonTransitional()) {
70 static UIDNA* uidna = CreateIDNA(/*use_idna_non_transitional=*/true);
71 return uidna;
72 } else {
73 static UIDNA* uidna = CreateIDNA(/*use_idna_non_transitional=*/false);
74 return uidna;
75 }
76}
77
78} // namespace
79
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]80// Converts the Unicode input representing a hostname to ASCII using IDN rules.
81// The output must be ASCII, but is represented as wide characters.
82//
83// On success, the output will be filled with the ASCII host name and it will
84// return true. Unlike most other canonicalization functions, this assumes that
85// the output is empty. The beginning of the host will be at offset 0, and
86// the length of the output will be set to the length of the new host name.
87//
88// On error, this will return false. The output in this case is undefined.
89// TODO(jungshik): use UTF-8/ASCII version of nameToASCII.
90// Change the function signature and callers accordingly to avoid unnecessary
91// conversions in our code. In addition, consider using icu::IDNA's UTF-8/ASCII
92// version with StringByteSink. That way, we can avoid C wrappers and additional
93// string conversion.
David Benjamincc4d2b22023-10-02 23:12:04[diff] [blame]94bool IDNToASCII(std::u16string_view src, CanonOutputW* output) {
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]95 DCHECK(output->length() == 0); // Output buffer is assumed empty.
96
Victor Vasiliev6a2bb592019-08-19 23:03:17[diff] [blame]97 UIDNA* uidna = GetUIDNA();
Bartek Nowierski3253b672020-06-01 20:37:12[diff] [blame]98 DCHECK(uidna != nullptr);
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]99 while (true) {
100 UErrorCode err = U_ZERO_ERROR;
101 UIDNAInfo info = UIDNA_INFO_INITIALIZER;
David Benjamincc4d2b22023-10-02 23:12:04[diff] [blame]102 int output_length = uidna_nameToASCII(
103 uidna, src.data(), base::checked_cast<int32_t>(src.size()),
104 output->data(), output->capacity(), &info, &err);
Timothy Gu211815e2021-05-14 07:00:47[diff] [blame]105
106 // Ignore various errors for web compatibility. The options are specified
107 // by the WHATWG URL Standard. See
108 // - https://unicode.org/reports/tr46/
109 // - https://url.spec.whatwg.org/#concept-domain-to-ascii
110 // (we set beStrict to false)
111
112 // Disable the "CheckHyphens" option in UTS #46. See
113 // - https://crbug.com/804688
114 // - https://github.com/whatwg/url/issues/267
115 info.errors &= ~UIDNA_ERROR_HYPHEN_3_4;
116 info.errors &= ~UIDNA_ERROR_LEADING_HYPHEN;
117 info.errors &= ~UIDNA_ERROR_TRAILING_HYPHEN;
118
119 // Disable the "VerifyDnsLength" option in UTS #46.
120 info.errors &= ~UIDNA_ERROR_EMPTY_LABEL;
121 info.errors &= ~UIDNA_ERROR_LABEL_TOO_LONG;
122 info.errors &= ~UIDNA_ERROR_DOMAIN_NAME_TOO_LONG;
123
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]124 if (U_SUCCESS(err) && info.errors == 0) {
Timothy Gu211815e2021-05-14 07:00:47[diff] [blame]125 // Per WHATWG URL, it is a failure if the ToASCII output is empty.
126 //
127 // ICU would usually return UIDNA_ERROR_EMPTY_LABEL in this case, but we
128 // want to continue allowing http://abc..def/ while forbidding http:///.
129 //
130 if (output_length == 0) {
131 return false;
132 }
133
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]134 output->set_length(output_length);
135 return true;
136 }
137
Victor Vasiliev8df3a6f2018-08-24 21:07:10[diff] [blame]138 if (err != U_BUFFER_OVERFLOW_ERROR || info.errors != 0)
139 return false; // Unknown error, give up.
140
141 // Not enough room in our buffer, expand.
142 output->Resize(output_length);
143 }
144}
145
146} // namespace url