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Side by Side Diff: net/http/http_util_icu.cc

Issue 2559243003: Extend with a language code in http accept languages
Patch Set: Rebased and modified descriptions Created 4 years ago
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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>
10 #include <vector>
11
12 #include "base/logging.h"
13 #include "base/strings/string_split.h"
14 #include "base/strings/stringprintf.h"
15 #include "third_party/icu/source/common/unicode/uloc.h"
16
17 namespace net {
18
19 // The input is a comma separated languages list, this function allows
20 // whitespace between each languages. It will come from the preference and a
21 // user does not manually edit the preference file. The accept languages that
22 // customized in Android Webview from developers are not processed here.
23 std::string HttpUtilIcu::GenerateAcceptLanguageHeader(
24 const std::string& raw_language_list) {
25 std::vector<std::string> locales_list = base::SplitString(
26 raw_language_list, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
27
28 // If language is not in the accept languages list, also add language
29 // code. A language code should only be inserted after the last
30 // languageTag that contains that language.
31 std::set<std::string> seen_languages;
32 std::vector<std::string> output_list;
33 for (auto it = locales_list.rbegin(); it != locales_list.rend(); ++it) {
34 char locale_ID[ULOC_FULLNAME_CAPACITY] = {};
35 char language_code[ULOC_LANG_CAPACITY] = {};
36
37 UErrorCode error = U_ZERO_ERROR;
38 std::string locale_string = *it;
39 uloc_forLanguageTag(locale_string.c_str(), locale_ID,
40 ULOC_FULLNAME_CAPACITY, nullptr, &error);
41 if (U_FAILURE(error)) {
42 LOG(ERROR) << "Ignoring invalid locale representation " << locale_string;
43 continue;
44 }
45
46 error = U_ZERO_ERROR;
47 uloc_getLanguage(locale_ID, language_code, ULOC_LANG_CAPACITY, &error);
48 if (U_FAILURE(error)) {
49 LOG(ERROR) << "Ignoring invalid locale representation " << locale_string;
50 continue;
51 }
52
53 if (seen_languages.find(language_code) == seen_languages.end()) {
54 output_list.push_back(language_code);
55 seen_languages.insert(language_code);
56 }
57
58 if (language_code != *it)
59 output_list.push_back(locale_string);
60 }
61
62 std::reverse(output_list.begin(), output_list.end());
63
64 // We use integers for q-value and q-value decrement that are 10 times larger
65 // than actual values to avoid a problem with comparing two floating point
66 // numbers.
67 const unsigned int kQvalueDecrement10 = 2;
68 unsigned int qvalue10 = 10;
69 std::string lang_list_with_q;
70 for (unsigned i = 0; i < output_list.size(); i++) {
71 if (qvalue10 == 10) {
72 // q=1.0 is implicit.
73 lang_list_with_q = output_list[i];
74 } else {
75 DCHECK_LT(qvalue10, 10U);
76 base::StringAppendF(&lang_list_with_q, ",%s;q=0.%d",
77 output_list[i].c_str(), qvalue10);
78 }
79 // It does not make sense to have 'q=0'.
80 if (qvalue10 > kQvalueDecrement10)
81 qvalue10 -= kQvalueDecrement10;
82 }
83 return lang_list_with_q;
84 }
85 }
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