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Commit 1db057d6 authored by Davis King's avatar Davis King
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Refactored the code in the http server so that it will be more reusable 

by other tools.
parent 05b1ba8b
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Showing with 183 additions and 111 deletions
dlib/server/server_http_1.h
View file @ 1db057d6
......@@ -25,34 +25,18 @@
namespace dlib
{
template <
typename server_base
>
class server_http_1 : public server_base
{
/*!
CONVENTION
this extension doesn't add any new state to this object.
!*/
// ----------------------------------------------------------------------------------------
public:
server_http_1()
class http_parse_error : public error
{
max_content_length = 10*1024*1024; // 10MB
}
public:
http_parse_error(const std::string& str, int http_error_code_):
error(str),http_error_code(http_error_code_) {}
unsigned long get_max_content_length (
) const { return max_content_length; }
const int http_error_code;
};
void set_max_content_length (
unsigned long max_length
)
{
max_content_length = max_length;
}
// ----------------------------------------------------------------------------------------
template <typename Key, typename Value>
class constmap : public std::map<Key, Value>
......@@ -78,10 +62,20 @@ namespace dlib
typedef constmap< std::string, std::string > key_value_map;
struct incoming_things
{
incoming_things() : foreign_port(0), local_port(0) {}
incoming_things (
const std::string& foreign_ip_,
const std::string& local_ip_,
unsigned short foreign_port_,
unsigned short local_port_
):
foreign_ip(foreign_ip_),
foreign_port(foreign_port_),
local_ip(local_ip_),
local_port(local_port_)
{}
std::string path;
std::string request_type;
......@@ -101,7 +95,7 @@ namespace dlib
struct outgoing_things
{
outgoing_things() : http_return(200) { }
outgoing_things() : http_return(200), http_return_status("OK") { }
key_value_map cookies;
key_value_map headers;
......@@ -109,19 +103,16 @@ namespace dlib
std::string http_return_status;
};
// ----------------------------------------------------------------------------------------
private:
virtual const std::string on_request (
const incoming_things& incoming,
outgoing_things& outgoing
) = 0;
unsigned char to_hex( unsigned char x ) const
namespace http_impl
{
inline unsigned char to_hex( unsigned char x )
{
return x + (x > 9 ? ('A'-10) : '0');
}
const std::string urlencode( const std::string& s ) const
inline const std::string urlencode( const std::string& s )
{
std::ostringstream os;
......@@ -146,9 +137,9 @@ namespace dlib
return os.str();
}
unsigned char from_hex (
inline unsigned char from_hex (
unsigned char ch
) const
)
{
if (ch <= '9' && ch >= '0')
ch -= '0';
......@@ -161,9 +152,9 @@ namespace dlib
return ch;
}
const std::string urldecode (
inline const std::string urldecode (
const std::string& str
) const
)
{
using namespace std;
string result;
......@@ -190,7 +181,10 @@ namespace dlib
return result;
}
void parse_url(std::string word, key_value_map& queries)
inline void parse_url(
std::string word,
key_value_map& queries
)
/*!
Parses the query string of a URL. word should be the stuff that comes
after the ? in the query URL.
......@@ -220,11 +214,11 @@ namespace dlib
}
}
void read_with_limit(
inline void read_with_limit(
std::istream& in,
std::string& buffer,
int delim = '\n'
) const
)
{
using namespace std;
const size_t max = 16*1024;
......@@ -236,6 +230,10 @@ namespace dlib
buffer += (char)in.get();
}
// if we quit the loop because the data is longer than expected or we hit EOF
if (in.peek() == EOF || buffer.size() == max)
throw http_parse_error("HTTP field from client is too long", 414);
// Make sure the last char is the delim.
if (in.get() != delim)
{
......@@ -252,31 +250,17 @@ namespace dlib
}
}
}
}
void on_connect (
inline unsigned long parse_http_request (
std::istream& in,
std::ostream& out,
const std::string& foreign_ip,
const std::string& local_ip,
unsigned short foreign_port,
unsigned short local_port,
uint64
incoming_things& incoming,
unsigned long max_content_length
)
{
bool my_fault = true;
using namespace std;
try
{
incoming_things incoming;
outgoing_things outgoing;
incoming.foreign_ip = foreign_ip;
incoming.foreign_port = foreign_port;
incoming.local_ip = local_ip;
incoming.local_port = local_port;
using namespace http_impl;
read_with_limit(in, incoming.request_type, ' ');
// get the path
......@@ -320,7 +304,16 @@ namespace dlib
istringstream sin(line.substr(16));
sin >> content_length;
if (!sin)
content_length = 0;
{
throw http_parse_error("Invalid Content-Length of '" + line.substr(16) + "'", 411);
}
if (content_length > max_content_length)
{
std::ostringstream sout;
sout << "Content-Length of post back is too large. It must be less than " << max_content_length;
throw http_parse_error(sout.str(), 413);
}
}
// look for any cookies
else if (line.size() > 6 && strings_equal_ignore_case(line, "Cookie:", 7))
......@@ -375,18 +368,6 @@ namespace dlib
read_with_limit(in, line);
} // while (line.size() > 2 )
// If there is data being posted back to us then load it into the incoming.body
// string.
if (content_length > max_content_length)
{
dlog << LERROR << "Request from: " << foreign_ip << " - body content length " << content_length << " exceeded max content length of " << max_content_length;
in.setstate(ios::badbit);
}
else if ( content_length > 0)
{
incoming.body.resize(content_length);
in.read(&incoming.body[0],content_length);
}
// If there is data being posted back to us as a query string then
// pick out the queries using parse_url.
......@@ -394,6 +375,11 @@ namespace dlib
strings_equal_ignore_case(incoming.request_type, "PUT")) &&
strings_equal_ignore_case(left_substr(content_type,";"), "application/x-www-form-urlencoded"))
{
if (content_length > 0)
{
incoming.body.resize(content_length);
in.read(&incoming.body[0],content_length);
}
parse_url(incoming.body, incoming.queries);
}
......@@ -404,32 +390,43 @@ namespace dlib
}
my_fault = false;
key_value_map& new_cookies = outgoing.cookies;
key_value_map& response_headers = outgoing.headers;
if (!in)
throw http_parse_error("Error parsing HTTP request", 500);
// Set some defaults
outgoing.http_return = 200;
outgoing.http_return_status = "OK";
return content_length;
}
// if there wasn't a problem with the input stream at some point
// then lets trigger this request callback.
std::string result;
if (in)
inline void read_body (
std::istream& in,
incoming_things& incoming
)
{
result = on_request(incoming, outgoing);
}
else
// if the body hasn't already been loaded and there is data to load
if (incoming.body.size() == 0 &&
incoming.headers.count("Content-Length") != 0)
{
const unsigned long content_length = string_cast<unsigned long>(incoming.headers["Content-Length"]);
incoming.body.resize(content_length);
if (content_length > 0)
{
dlog << LERROR << "Request from: " << foreign_ip << " - Invalid request - Request Entity Too Large";
outgoing.http_return = 413;
outgoing.http_return_status = "Request Entity Too Large";
in.read(&incoming.body[0],content_length);
}
}
}
my_fault = true;
inline void write_http_response (
std::ostream& out,
outgoing_things outgoing,
const std::string& result
)
{
using namespace http_impl;
key_value_map& new_cookies = outgoing.cookies;
key_value_map& response_headers = outgoing.headers;
// only send this header if the user hasn't told us to send another kind
bool has_content_type(false),
has_location(false);
bool has_content_type = false, has_location = false;
for( typename key_value_map::const_iterator ci = response_headers.begin(); ci != response_headers.end(); ++ci )
{
if ( !has_content_type && strings_equal_ignore_case(ci->first , "content-type") )
......@@ -452,12 +449,7 @@ namespace dlib
response_headers["Content-Type"] = "text/html";
}
{
ostringstream os;
os << result.size();
response_headers["Content-Length"] = os.str();
}
response_headers["Content-Length"] = cast_to_string(result.size());
out << "HTTP/1.0 " << outgoing.http_return << " " << outgoing.http_return_status << "\r\n";
......@@ -474,16 +466,98 @@ namespace dlib
}
out << "\r\n" << result;
}
catch (std::bad_alloc&)
inline void write_http_response (
std::ostream& out,
const http_parse_error& e
)
{
outgoing_things outgoing;
outgoing.http_return = e.http_error_code;
outgoing.http_return_status = e.what();
write_http_response(out, outgoing, std::string("Error processing request: ") + e.what());
}
inline void write_http_response (
std::ostream& out,
const std::exception& e
)
{
dlog << LERROR << "We ran out of memory in server_http::on_connect()";
// If this is an escaped exception from on_request then let it fly!
// Seriously though, this way it is obvious to the user that something bad happened
// since they probably won't have the dlib logger enabled.
if (!my_fault)
throw;
outgoing_things outgoing;
outgoing.http_return = 500;
outgoing.http_return_status = e.what();
write_http_response(out, outgoing, std::string("Error processing request: ") + e.what());
}
// ----------------------------------------------------------------------------------------
template <
typename server_base
>
class server_http_1 : public server_base
{
/*!
CONVENTION
this extension doesn't add any new state to this object.
!*/
public:
server_http_1()
{
max_content_length = 10*1024*1024; // 10MB
}
unsigned long get_max_content_length (
) const { return max_content_length; }
void set_max_content_length (
unsigned long max_length
)
{
max_content_length = max_length;
}
private:
virtual const std::string on_request (
const incoming_things& incoming,
outgoing_things& outgoing
) = 0;
void on_connect (
std::istream& in,
std::ostream& out,
const std::string& foreign_ip,
const std::string& local_ip,
unsigned short foreign_port,
unsigned short local_port,
uint64
)
{
try
{
incoming_things incoming(foreign_ip, local_ip, foreign_port, local_port);
outgoing_things outgoing;
parse_http_request(in, incoming, max_content_length);
read_body(in, incoming);
const std::string& result = on_request(incoming, outgoing);
write_http_response(out, outgoing, result);
}
catch (http_parse_error& e)
{
dlog << LERROR << "Error processing request from: " << foreign_ip << " - " << e.what();
write_http_response(out, e);
}
catch (std::exception& e)
{
dlog << LERROR << "Error processing request from: " << foreign_ip << " - " << e.what();
write_http_response(out, e);
}
}
unsigned long max_content_length;
......@@ -498,6 +572,3 @@ namespace dlib
#endif // DLIB_SERVER_HTTp_1_
dlib/server/server_http_abstract.h
View file @ 1db057d6
......@@ -193,7 +193,8 @@ namespace dlib
- outgoing.http_return and outgoing.http_return_status may be set to override the
default HTTP return code of 200 OK
throws
- does not throw any exceptions
- throws only exceptions derived from std::exception. If an exception is thrown
then the error string from the exception is returned to the web browser.
!*/
};
......
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