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1 // Copyright (c) 2016 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 "net/http/http_util_icu.h" | |
6 | |
7 #include <algorithm> | |
8 #include <set> | |
9 #include <string> | |
Seigo Nonaka
2016/12/12 07:29:26
string is necessary for std::string
Yirui Huang
2016/12/12 07:41:35
Done.
| |
10 #include <vector> | |
11 | |
12 #include "base/logging.h" | |
13 #include "base/strings/string_number_conversions.h" | |
14 #include "base/strings/string_piece.h" | |
15 #include "base/strings/string_split.h" | |
16 #include "base/strings/string_tokenizer.h" | |
17 #include "base/strings/string_util.h" | |
18 #include "base/strings/stringprintf.h" | |
19 #include "base/time/time.h" | |
Seigo Nonaka
2016/12/12 01:48:54
probably, some of headers are not necessary, e.g.
Yirui Huang
2016/12/12 06:50:41
Done.
| |
20 #include "net/base/url_util.h" | |
21 #include "third_party/icu/source/common/unicode/uloc.h" | |
22 | |
23 namespace net { | |
24 | |
25 // The input is a comma separated languages list, this function allows | |
26 // whitespace between each languages. As long as it comes from the preference | |
27 // and a user does not manually edit the preference file, it's the case. | |
28 // TODO(yirui): We still need to be aware of cases, make it more robust. | |
Seigo Nonaka
2016/12/12 01:48:54
AndroidWebView is the only case that the developer
Yirui Huang
2016/12/12 06:50:40
The change from developers will not use http_util,
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29 std::string HttpUtilIcu::GenerateAcceptLanguageHeader( | |
30 const std::string& raw_language_list) { | |
31 std::vector<std::string> locales_list = base::SplitString( | |
32 raw_language_list, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY); | |
33 | |
34 // If language is not in the accept languages list, also add language | |
35 // code. A language code should only be inserted after the last | |
36 // languageTag that contains that language. | |
37 // This will work with the IDS_ACCEPT_LANGUAGE localized strings bundled | |
Seigo Nonaka
2016/12/12 01:48:54
I think this comment is no longer necessary.
Yirui Huang
2016/12/12 06:50:41
Done.
| |
38 // with Chrome but may fail on arbitrary lists of language tags due to | |
39 // differences in case and whitespace. | |
40 std::set<std::string> seen_languages; | |
41 std::vector<std::string> output_list; | |
42 for (auto it = locales_list.rbegin(); it != locales_list.rend(); ++it) { | |
43 char locale_ID[ULOC_FULLNAME_CAPACITY] = {}; | |
44 char language_code[ULOC_LANG_CAPACITY] = {}; | |
45 | |
46 UErrorCode error = U_ZERO_ERROR; | |
47 std::string locale_string = *it; | |
48 uloc_forLanguageTag(locale_string.c_str(), locale_ID, | |
49 ULOC_FULLNAME_CAPACITY, nullptr, &error); | |
50 if (U_FAILURE(error)) { | |
51 LOG(ERROR) << "Ignoring invalid locale representation " << locale_string; | |
52 continue; | |
53 } | |
54 | |
55 error = U_ZERO_ERROR; | |
56 uloc_getLanguage(locale_ID, language_code, ULOC_LANG_CAPACITY, &error); | |
57 if (U_FAILURE(error)) { | |
58 LOG(ERROR) << "Ignoring invalid locale representation " << locale_string; | |
59 continue; | |
60 } | |
61 | |
62 if (seen_languages.find(language_code) == seen_languages.end()) { | |
63 output_list.push_back(language_code); | |
64 seen_languages.insert(language_code); | |
65 } | |
66 | |
67 if (language_code != *it) | |
68 output_list.push_back(locale_string); | |
69 } | |
70 | |
71 std::reverse(output_list.begin(), output_list.end()); | |
72 std::string final_language_list = base::JoinString(output_list, ","); | |
73 | |
74 // We use integers for qvalue and qvalue decrement that are 10 times | |
75 // larger than actual values to avoid a problem with comparing | |
76 // two floating point numbers. | |
77 const unsigned int kQvalueDecrement10 = 2; | |
78 unsigned int qvalue10 = 10; | |
79 base::StringTokenizer t(final_language_list, ","); | |
80 std::string lang_list_with_q; | |
81 while (t.GetNext()) { | |
Seigo Nonaka
2016/12/12 01:48:54
Let's use output_list here. You joined string then
Yirui Huang
2016/12/12 06:50:40
Done.
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82 std::string language = t.token(); | |
83 if (qvalue10 == 10) { | |
84 // q=1.0 is implicit. | |
85 lang_list_with_q = language; | |
86 } else { | |
87 DCHECK_LT(qvalue10, 10U); | |
88 base::StringAppendF(&lang_list_with_q, ",%s;q=0.%d", language.c_str(), | |
89 qvalue10); | |
90 } | |
91 // It does not make sense to have 'q=0'. | |
92 if (qvalue10 > kQvalueDecrement10) | |
93 qvalue10 -= kQvalueDecrement10; | |
94 } | |
95 return lang_list_with_q; | |
96 } | |
97 } | |
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