1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
#include "common.hh"
#include <algorithm>
#include "header_parser.hh"
#include "multipart_formdata_parser.hh"
#include "strutils.hh"
namespace stuff {
namespace {
template<typename Iterator>
Iterator find_boundary(Iterator begin, Iterator end,
const std::string& boundary,
bool* last) {
Iterator start, test;
for (auto it = begin; it != end; ++it) {
if (it == begin && *it == '-') {
start = it;
test = it + 1;
if (test == end || *test != '-') continue;
} else if (*it == '\r') {
start = it;
test = it + 1;
if (test == end || *test != '\n') continue;
++test;
if (test == end || *test != '-') continue;
++test;
if (test == end || *test != '-') continue;
} else {
continue;
}
++test;
if (static_cast<size_t>(end - test) <= boundary.size()) break;
if (boundary.compare(0, std::string::npos,
&(*test), boundary.size()) == 0) {
test += boundary.size();
if (test == end) break;
if (*test == '-') {
++test;
if (test == end || *test != '-') continue;
*last = true;
return start;
} else if (*test == '\r') {
++test;
if (test == end || *test != '\n') continue;
*last = false;
return start;
}
}
}
*last = true;
return end;
}
template<typename Iterator>
bool parse_part(Iterator begin, Iterator end,
std::map<std::string, std::string>* out) {
static const char EOL[] = "\r\n";
bool have_name = false, ok_contenttype = true, ok_encoding = true,
ok_content = true;
std::string name;
while (true) {
auto eol = std::search(begin, end, EOL, EOL + 2);
if (eol == end) return false;
if (eol == begin) {
begin += 2;
break;
}
auto colon = std::find(begin, eol, ':');
if (colon == eol) return false;
std::string header =
ascii_tolower(std::string(&(*begin), colon - begin));
++colon;
if (colon == eol) return false;
if (header == "content-disposition" || header == "content-type" ||
header == "content-transfer-encoding") {
std::string token;
std::map<std::string, std::string> params;
std::string value = std::string(&(*colon), eol - colon);
if (!HeaderParser::parse(std::string(&(*colon), eol - colon),
&token, ¶ms)) return false;
if (header[9] == 'i') { // content-disposition
if (token == "form-data") {
auto it = params.find("name");
if (it == params.end()) return false;
have_name = true;
name = it->second;
ok_content = true;
} else {
ok_content = false;
}
} else if (header[9] == 'y') { // content-type
auto pos = token.find('/');
if (pos == std::string::npos) return false;
ok_contenttype = true;
if (token.compare(0, pos, "text") != 0) ok_contenttype = false;
if (ok_contenttype) {
auto it = params.find("charset");
if (it != params.end()) {
std::string charset = ascii_tolower(it->second);
ok_contenttype = charset == "ascii" ||
charset == "us-ascii" ||
charset == "utf-8";
}
}
} else /* if (header[9] == 'r') */ { // content-transfer-encoding
ok_encoding = token == "7bit" || token == "8bit" ||
token == "binary" || token == "identity";
}
}
begin = eol + 2;
}
if (have_name && ok_contenttype && ok_encoding && ok_content) {
(*out)[name] = std::string(&(*begin), end - begin);
}
return true;
}
} // namespace
bool MultipartFormDataParser::parse(const std::vector<char>& in,
const std::string& boundary,
std::map<std::string, std::string>* out) {
bool last;
auto start = find_boundary(in.begin(), in.end(), boundary, &last);
out->clear();
if (start == in.end()) return in.empty();
if (last) return true;
if (*start != '-') start += 2;
while (true)
{
start += boundary.size() + 4;
auto end = find_boundary(start, in.end(), boundary, &last);
if (end == in.end()) return false;
if (!parse_part(start, end, out)) {
return false;
}
if (last) return true;
start = end + 2;
}
}
} // namespace stuff
|
