Botan::HTTP Namespace Reference

Classes
class	HTTP_Error
class	Response

Typedefs
typedef std::function< std::string(const std::string &, const std::string &)>	http_exch_fn

Functions
Response	GET_sync (const std::string &url, size_t allowable_redirects, std::chrono::milliseconds timeout)
Response	http_sync (http_exch_fn http_transact, const std::string &verb, const std::string &url, const std::string &content_type, const std::vector< uint8_t > &body, size_t allowable_redirects)
Response	http_sync (const std::string &verb, const std::string &url, const std::string &content_type, const std::vector< uint8_t > &body, size_t allowable_redirects, std::chrono::milliseconds timeout)
std::ostream &	operator<< (std::ostream &o, const Response &resp)
Response	POST_sync (const std::string &url, const std::string &content_type, const std::vector< uint8_t > &body, size_t allowable_redirects, std::chrono::milliseconds timeout)
std::string	url_encode (const std::string &in)

Typedef Documentation

typedef std::function<std::string (const std::string&, const std::string&)> Botan::HTTP::http_exch_fn

Definition at line 75 of file http_util.h.

Function Documentation

Response Botan::HTTP::GET_sync	(	const std::string &	url,
		size_t	allowable_redirects,
		std::chrono::milliseconds	timeout
	)

Definition at line 236 of file http_util.cpp.

References http_sync().

Referenced by http_sync().

   {
   return http_sync("GET", url, "", std::vector<uint8_t>(), allowable_redirects, timeout);
   }

Response Botan::HTTP::http_sync	(	http_exch_fn	http_transact,
		const std::string &	verb,
		const std::string &	url,
		const std::string &	content_type,
		const std::vector< uint8_t > &	body,
		size_t	allowable_redirects
	)

Definition at line 104 of file http_util.cpp.

References Botan::cast_uint8_ptr_to_char(), GET_sync(), Botan::search_map(), Botan::ASN1::to_string(), and Botan::to_u32bit().

Referenced by GET_sync(), http_sync(), and POST_sync().

   {
   if(url.empty())
      throw HTTP_Error("URL empty");

   const auto protocol_host_sep = url.find("://");
   if(protocol_host_sep == std::string::npos)
      throw HTTP_Error("Invalid URL '" + url + "'");

   const auto host_loc_sep = url.find('/', protocol_host_sep + 3);

   std::string hostname, loc;

   if(host_loc_sep == std::string::npos)
      {
      hostname = url.substr(protocol_host_sep + 3, std::string::npos);
      loc = "/";
      }
   else
      {
      hostname = url.substr(protocol_host_sep + 3, host_loc_sep-protocol_host_sep-3);
      loc = url.substr(host_loc_sep, std::string::npos);
      }

   std::ostringstream outbuf;

   outbuf << verb << " " << loc << " HTTP/1.0\r\n";
   outbuf << "Host: " << hostname << "\r\n";

   if(verb == "GET")
      {
      outbuf << "Accept: */*\r\n";
      outbuf << "Cache-Control: no-cache\r\n";
      }
   else if(verb == "POST")
      outbuf << "Content-Length: " << body.size() << "\r\n";

   if(!content_type.empty())
      outbuf << "Content-Type: " << content_type << "\r\n";
   outbuf << "Connection: close\r\n\r\n";
   outbuf.write(cast_uint8_ptr_to_char(body.data()), body.size());

   std::istringstream io(http_transact(hostname, outbuf.str()));

   std::string line1;
   std::getline(io, line1);
   if(!io || line1.empty())
      throw HTTP_Error("No response");

   std::stringstream response_stream(line1);
   std::string http_version;
   unsigned int status_code;
   std::string status_message;

   response_stream >> http_version >> status_code;

   std::getline(response_stream, status_message);

   if(!response_stream || http_version.substr(0,5) != "HTTP/")
      throw HTTP_Error("Not an HTTP response");

   std::map<std::string, std::string> headers;
   std::string header_line;
   while (std::getline(io, header_line) && header_line != "\r")
      {
      auto sep = header_line.find(": ");
      if(sep == std::string::npos || sep > header_line.size() - 2)
         throw HTTP_Error("Invalid HTTP header " + header_line);
      const std::string key = header_line.substr(0, sep);

      if(sep + 2 < header_line.size() - 1)
         {
         const std::string val = header_line.substr(sep + 2, (header_line.size() - 1) - (sep + 2));
         headers[key] = val;
         }
      }

   if(status_code == 301 && headers.count("Location"))
      {
      if(allowable_redirects == 0)
         throw HTTP_Error("HTTP redirection count exceeded");
      return GET_sync(headers["Location"], allowable_redirects - 1);
      }

   std::vector<uint8_t> resp_body;
   std::vector<uint8_t> buf(4096);
   while(io.good())
      {
      io.read(cast_uint8_ptr_to_char(buf.data()), buf.size());
      const size_t got = static_cast<size_t>(io.gcount());
      resp_body.insert(resp_body.end(), buf.data(), &buf[got]);
      }

   const std::string header_size = search_map(headers, std::string("Content-Length"));

   if(!header_size.empty())
      {
      if(resp_body.size() != to_u32bit(header_size))
         throw HTTP_Error("Content-Length disagreement, header says " +
                          header_size + " got " + std::to_string(resp_body.size()));
      }

   return Response(status_code, status_message, resp_body, headers);
   }

Response Botan::HTTP::http_sync	(	const std::string &	verb,
		const std::string &	url,
		const std::string &	content_type,
		const std::vector< uint8_t > &	body,
		size_t	allowable_redirects,
		std::chrono::milliseconds	timeout
	)

Definition at line 214 of file http_util.cpp.

References http_sync().

   {
   auto transact_with_timeout =
      [timeout](const std::string& hostname, const std::string& service)
      {
      return http_transact(hostname, service, timeout);
      };

   return http_sync(
      transact_with_timeout,
      verb,
      url,
      content_type,
      body,
      allowable_redirects);
   }

std::ostream & Botan::HTTP::operator<<	(	std::ostream &	o,
		const Response &	resp
	)

Definition at line 94 of file http_util.cpp.

References Botan::HTTP::Response::body(), Botan::cast_uint8_ptr_to_char(), Botan::HTTP::Response::headers(), Botan::HTTP::Response::status_code(), Botan::HTTP::Response::status_message(), and Botan::ASN1::to_string().

   {
   o << "HTTP " << resp.status_code() << " " << resp.status_message() << "\n";
   for(auto h : resp.headers())
      o << "Header '" << h.first << "' = '" << h.second << "'\n";
   o << "Body " << std::to_string(resp.body().size()) << " bytes:\n";
   o.write(cast_uint8_ptr_to_char(resp.body().data()), resp.body().size());
   return o;
   }

Response Botan::HTTP::POST_sync	(	const std::string &	url,
		const std::string &	content_type,
		const std::vector< uint8_t > &	body,
		size_t	allowable_redirects,
		std::chrono::milliseconds	timeout
	)

Definition at line 243 of file http_util.cpp.

References http_sync().

   {
   return http_sync("POST", url, content_type, body, allowable_redirects, timeout);
   }

std::string Botan::HTTP::url_encode

(

const std::string &

in

)

Definition at line 73 of file http_util.cpp.

References Botan::cast_char_ptr_to_uint8(), and Botan::hex_encode().

   {
   std::ostringstream out;

   for(auto c : in)
      {
      if(c >= 'A' && c <= 'Z')
         out << c;
      else if(c >= 'a' && c <= 'z')
         out << c;
      else if(c >= '0' && c <= '9')
         out << c;
      else if(c == '-' || c == '_' || c == '.' || c == '~')
         out << c;
      else
         out << '%' << hex_encode(cast_char_ptr_to_uint8(&c), 1);
      }

   return out.str();
   }