WebSocket++  0.8.0-dev
C++ websocket client/server library
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parser.hpp
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27 
28 #ifndef HTTP_PARSER_IMPL_HPP
29 #define HTTP_PARSER_IMPL_HPP
30 
31 #include <algorithm>
32 #include <cstdlib>
33 #include <istream>
34 #include <sstream>
35 #include <string>
36 
37 namespace websocketpp {
38 namespace http {
39 namespace parser {
40 
41 inline void parser::set_version(std::string const & version) {
42  m_version = version;
43 }
44 
45 inline std::string const & parser::get_header(std::string const & key) const {
46  header_list::const_iterator h = m_headers.find(key);
47 
48  if (h == m_headers.end()) {
49  return empty_header;
50  } else {
51  return h->second;
52  }
53 }
54 
55 inline bool parser::get_header_as_plist(std::string const & key,
56  parameter_list & out) const
57 {
58  header_list::const_iterator it = m_headers.find(key);
59 
60  if (it == m_headers.end() || it->second.size() == 0) {
61  return false;
62  }
63 
64  return this->parse_parameter_list(it->second,out);
65 }
66 
67 inline void parser::append_header(std::string const & key, std::string const &
68  val)
69 {
70  if (std::find_if(key.begin(),key.end(),is_not_token_char) != key.end()) {
71  throw exception("Invalid header name",status_code::bad_request);
72  }
73 
74  if (this->get_header(key).empty()) {
75  m_headers[key] = val;
76  } else {
77  m_headers[key] += ", " + val;
78  }
79 }
80 
81 inline void parser::replace_header(std::string const & key, std::string const &
82  val)
83 {
84  m_headers[key] = val;
85 }
86 
87 inline void parser::remove_header(std::string const & key) {
88  m_headers.erase(key);
89 }
90 
91 inline void parser::set_body(std::string const & value) {
92  if (value.size() == 0) {
93  remove_header("Content-Length");
94  m_body.clear();
95  return;
96  }
97 
98  // TODO: should this method respect the max size? If so how should errors
99  // be indicated?
100 
101  std::stringstream len;
102  len << value.size();
103  replace_header("Content-Length", len.str());
104  m_body = value;
105 }
106 
107 inline bool parser::parse_parameter_list(std::string const & in,
108  parameter_list & out) const
109 {
110  if (in.size() == 0) {
111  return false;
112  }
113 
114  std::string::const_iterator it;
115  it = extract_parameters(in.begin(),in.end(),out);
116  return (it == in.begin());
117 }
118 
119 inline bool parser::prepare_body() {
120  if (!get_header("Content-Length").empty()) {
121  std::string const & cl_header = get_header("Content-Length");
122  char * end;
123 
124  // TODO: not 100% sure what the compatibility of this method is. Also,
125  // I believe this will only work up to 32bit sizes. Is there a need for
126  // > 4GiB HTTP payloads?
127  m_body_bytes_needed = std::strtoul(cl_header.c_str(),&end,10);
128 
129  if (m_body_bytes_needed > m_body_bytes_max) {
130  throw exception("HTTP message body too large",
131  status_code::request_entity_too_large);
132  }
133 
134  m_body_encoding = body_encoding::plain;
135  return true;
136  } else if (get_header("Transfer-Encoding") == "chunked") {
137  // TODO
138  //m_body_encoding = body_encoding::chunked;
139  return false;
140  } else {
141  return false;
142  }
143 }
144 
145 inline size_t parser::process_body(char const * buf, size_t len) {
146  if (m_body_encoding == body_encoding::plain) {
147  size_t processed = (std::min)(m_body_bytes_needed,len);
148  m_body.append(buf,processed);
149  m_body_bytes_needed -= processed;
150  return processed;
151  } else if (m_body_encoding == body_encoding::chunked) {
152  // TODO:
153  throw exception("Unexpected body encoding",
154  status_code::internal_server_error);
155  } else {
156  throw exception("Unexpected body encoding",
157  status_code::internal_server_error);
158  }
159 }
160 
161 inline void parser::process_header(std::string::iterator begin,
162  std::string::iterator end)
163 {
164  std::string::iterator cursor = std::search(
165  begin,
166  end,
167  header_separator,
168  header_separator + sizeof(header_separator) - 1
169  );
170 
171  if (cursor == end) {
172  throw exception("Invalid header line",status_code::bad_request);
173  }
174 
175  append_header(strip_lws(std::string(begin,cursor)),
176  strip_lws(std::string(cursor+sizeof(header_separator)-1,end)));
177 }
178 
179 inline std::string parser::raw_headers() const {
180  std::stringstream raw;
181 
182  header_list::const_iterator it;
183  for (it = m_headers.begin(); it != m_headers.end(); it++) {
184  raw << it->first << ": " << it->second << "\r\n";
185  }
186 
187  return raw.str();
188 }
189 
190 
191 
192 } // namespace parser
193 } // namespace http
194 } // namespace websocketpp
195 
196 #endif // HTTP_PARSER_IMPL_HPP
HTTP handling support.
Definition: constants.hpp:39
void handle_accept(connection_ptr con, lib::error_code const &ec)
Handler callback for start_accept.