1 // Copyright (c) 2013 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 "base/json/string_escape.h"
6
7 #include <stddef.h>
8
9 #include "base/macros.h"
10 #include "base/strings/string_util.h"
11 #include "base/strings/utf_string_conversions.h"
12 #include "testing/gtest/include/gtest/gtest.h"
13
14 namespace base {
15
TEST(JSONStringEscapeTest,EscapeUTF8)16 TEST(JSONStringEscapeTest, EscapeUTF8) {
17 const struct {
18 const char* to_escape;
19 const char* escaped;
20 } cases[] = {
21 {"\b\001aZ\"\\wee", "\\b\\u0001aZ\\\"\\\\wee"},
22 {"a\b\f\n\r\t\v\1\\.\"z",
23 "a\\b\\f\\n\\r\\t\\u000B\\u0001\\\\.\\\"z"},
24 {"b\x0f\x7f\xf0\xff!", // \xf0\xff is not a valid UTF-8 unit.
25 "b\\u000F\x7F\xEF\xBF\xBD\xEF\xBF\xBD!"},
26 {"c<>d", "c\\u003C>d"},
27 {"Hello\xe2\x80\xa8world", "Hello\\u2028world"},
28 {"\xe2\x80\xa9purple", "\\u2029purple"},
29 };
30
31 for (size_t i = 0; i < arraysize(cases); ++i) {
32 const char* in_ptr = cases[i].to_escape;
33 std::string in_str = in_ptr;
34
35 std::string out;
36 EscapeJSONString(in_ptr, false, &out);
37 EXPECT_EQ(std::string(cases[i].escaped), out);
38 EXPECT_TRUE(IsStringUTF8(out));
39
40 out.erase();
41 bool convert_ok = EscapeJSONString(in_str, false, &out);
42 EXPECT_EQ(std::string(cases[i].escaped), out);
43 EXPECT_TRUE(IsStringUTF8(out));
44
45 if (convert_ok) {
46 std::string fooout = GetQuotedJSONString(in_str);
47 EXPECT_EQ("\"" + std::string(cases[i].escaped) + "\"", fooout);
48 EXPECT_TRUE(IsStringUTF8(out));
49 }
50 }
51
52 std::string in = cases[0].to_escape;
53 std::string out;
54 EscapeJSONString(in, false, &out);
55 EXPECT_TRUE(IsStringUTF8(out));
56
57 // test quoting
58 std::string out_quoted;
59 EscapeJSONString(in, true, &out_quoted);
60 EXPECT_EQ(out.length() + 2, out_quoted.length());
61 EXPECT_EQ(out_quoted.find(out), 1U);
62 EXPECT_TRUE(IsStringUTF8(out_quoted));
63
64 // now try with a NULL in the string
65 std::string null_prepend = "test";
66 null_prepend.push_back(0);
67 in = null_prepend + in;
68 std::string expected = "test\\u0000";
69 expected += cases[0].escaped;
70 out.clear();
71 EscapeJSONString(in, false, &out);
72 EXPECT_EQ(expected, out);
73 EXPECT_TRUE(IsStringUTF8(out));
74 }
75
TEST(JSONStringEscapeTest,EscapeUTF16)76 TEST(JSONStringEscapeTest, EscapeUTF16) {
77 const struct {
78 const wchar_t* to_escape;
79 const char* escaped;
80 } cases[] = {
81 {L"b\uffb1\u00ff", "b\xEF\xBE\xB1\xC3\xBF"},
82 {L"\b\001aZ\"\\wee", "\\b\\u0001aZ\\\"\\\\wee"},
83 {L"a\b\f\n\r\t\v\1\\.\"z",
84 "a\\b\\f\\n\\r\\t\\u000B\\u0001\\\\.\\\"z"},
85 {L"b\x0f\x7f\xf0\xff!", "b\\u000F\x7F\xC3\xB0\xC3\xBF!"},
86 {L"c<>d", "c\\u003C>d"},
87 {L"Hello\u2028world", "Hello\\u2028world"},
88 {L"\u2029purple", "\\u2029purple"},
89 };
90
91 for (size_t i = 0; i < arraysize(cases); ++i) {
92 string16 in = WideToUTF16(cases[i].to_escape);
93
94 std::string out;
95 EscapeJSONString(in, false, &out);
96 EXPECT_EQ(std::string(cases[i].escaped), out);
97 EXPECT_TRUE(IsStringUTF8(out));
98
99 out = GetQuotedJSONString(in);
100 EXPECT_EQ("\"" + std::string(cases[i].escaped) + "\"", out);
101 EXPECT_TRUE(IsStringUTF8(out));
102 }
103
104 string16 in = WideToUTF16(cases[0].to_escape);
105 std::string out;
106 EscapeJSONString(in, false, &out);
107 EXPECT_TRUE(IsStringUTF8(out));
108
109 // test quoting
110 std::string out_quoted;
111 EscapeJSONString(in, true, &out_quoted);
112 EXPECT_EQ(out.length() + 2, out_quoted.length());
113 EXPECT_EQ(out_quoted.find(out), 1U);
114 EXPECT_TRUE(IsStringUTF8(out));
115
116 // now try with a NULL in the string
117 string16 null_prepend = WideToUTF16(L"test");
118 null_prepend.push_back(0);
119 in = null_prepend + in;
120 std::string expected = "test\\u0000";
121 expected += cases[0].escaped;
122 out.clear();
123 EscapeJSONString(in, false, &out);
124 EXPECT_EQ(expected, out);
125 EXPECT_TRUE(IsStringUTF8(out));
126 }
127
TEST(JSONStringEscapeTest,EscapeUTF16OutsideBMP)128 TEST(JSONStringEscapeTest, EscapeUTF16OutsideBMP) {
129 {
130 // {a, U+10300, !}, SMP.
131 string16 test;
132 test.push_back('a');
133 test.push_back(0xD800);
134 test.push_back(0xDF00);
135 test.push_back('!');
136 std::string actual;
137 EXPECT_TRUE(EscapeJSONString(test, false, &actual));
138 EXPECT_EQ("a\xF0\x90\x8C\x80!", actual);
139 }
140 {
141 // {U+20021, U+2002B}, SIP.
142 string16 test;
143 test.push_back(0xD840);
144 test.push_back(0xDC21);
145 test.push_back(0xD840);
146 test.push_back(0xDC2B);
147 std::string actual;
148 EXPECT_TRUE(EscapeJSONString(test, false, &actual));
149 EXPECT_EQ("\xF0\xA0\x80\xA1\xF0\xA0\x80\xAB", actual);
150 }
151 {
152 // {?, U+D800, @}, lone surrogate.
153 string16 test;
154 test.push_back('?');
155 test.push_back(0xD800);
156 test.push_back('@');
157 std::string actual;
158 EXPECT_FALSE(EscapeJSONString(test, false, &actual));
159 EXPECT_EQ("?\xEF\xBF\xBD@", actual);
160 }
161 }
162
TEST(JSONStringEscapeTest,EscapeBytes)163 TEST(JSONStringEscapeTest, EscapeBytes) {
164 const struct {
165 const char* to_escape;
166 const char* escaped;
167 } cases[] = {
168 {"b\x0f\x7f\xf0\xff!", "b\\u000F\\u007F\\u00F0\\u00FF!"},
169 {"\xe5\xc4\x4f\x05\xb6\xfd", "\\u00E5\\u00C4O\\u0005\\u00B6\\u00FD"},
170 };
171
172 for (size_t i = 0; i < arraysize(cases); ++i) {
173 std::string in = std::string(cases[i].to_escape);
174 EXPECT_FALSE(IsStringUTF8(in));
175
176 EXPECT_EQ(std::string(cases[i].escaped),
177 EscapeBytesAsInvalidJSONString(in, false));
178 EXPECT_EQ("\"" + std::string(cases[i].escaped) + "\"",
179 EscapeBytesAsInvalidJSONString(in, true));
180 }
181
182 const char kEmbedNull[] = { '\xab', '\x39', '\0', '\x9f', '\xab' };
183 std::string in(kEmbedNull, arraysize(kEmbedNull));
184 EXPECT_FALSE(IsStringUTF8(in));
185 EXPECT_EQ(std::string("\\u00AB9\\u0000\\u009F\\u00AB"),
186 EscapeBytesAsInvalidJSONString(in, false));
187 }
188
189 } // namespace base
190