barrier/server/CHTTPServer.cpp

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#include "CHTTPServer.h"
#include "CConfig.h"
#include "CHTTPProtocol.h"
#include "CServer.h"
#include "XHTTP.h"
#include "IDataSocket.h"
#include "XThread.h"
#include "CLog.h"
#include "stdset.h"
#include "stdsstream.h"
//
// CHTTPServer
//
// maximum size of an HTTP request. this should be large enough to
// handle any reasonable request but small enough to prevent a
// malicious client from causing us to use too much memory.
const UInt32 CHTTPServer::s_maxRequestSize = 32768;
CHTTPServer::CHTTPServer(
CServer* server) :
m_server(server)
{
// do nothing
}
CHTTPServer::~CHTTPServer()
{
// do nothing
}
void
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CHTTPServer::processRequest(IDataSocket* socket)
{
assert(socket != NULL);
CHTTPRequest* request = NULL;
try {
// parse request
request = CHTTPProtocol::readRequest(
socket->getInputStream(), s_maxRequestSize);
if (request == NULL) {
throw XHTTP(400);
}
// if absolute uri then strip off scheme and host
if (request->m_uri[0] != '/') {
CString::size_type n = request->m_uri.find('/');
if (n == CString::npos) {
throw XHTTP(404);
}
request->m_uri = request->m_uri.substr(n);
}
// process
CHTTPReply reply;
doProcessRequest(*request, reply);
// send reply
CHTTPProtocol::reply(socket->getOutputStream(), reply);
log((CLOG_INFO "HTTP reply %d for %s %s", reply.m_status, request->m_method.c_str(), request->m_uri.c_str()));
// clean up
delete request;
}
catch (XHTTP& e) {
log((CLOG_WARN "returning HTTP error %d %s for %s", e.getStatus(), e.getReason().c_str(), (request != NULL) ? request->m_uri.c_str() : "<unknown>"));
// clean up
delete request;
// return error
CHTTPReply reply;
reply.m_majorVersion = 1;
reply.m_minorVersion = 0;
reply.m_status = e.getStatus();
reply.m_reason = e.getReason();
reply.m_method = "GET";
// FIXME -- use a nicer error page
reply.m_headers.push_back(std::make_pair(CString("Content-Type"),
CString("text/plain")));
reply.m_body = e.getReason();
e.addHeaders(reply);
CHTTPProtocol::reply(socket->getOutputStream(), reply);
}
catch (...) {
// ignore other exceptions
RETHROW_XTHREAD
}
}
void
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CHTTPServer::doProcessRequest(CHTTPRequest& request, CHTTPReply& reply)
{
reply.m_majorVersion = request.m_majorVersion;
reply.m_minorVersion = request.m_minorVersion;
reply.m_status = 200;
reply.m_reason = "OK";
reply.m_method = request.m_method;
reply.m_headers.push_back(std::make_pair(CString("Content-Type"),
CString("text/html")));
// switch based on uri
if (request.m_uri == "/editmap") {
if (request.m_method == "GET" || request.m_method == "HEAD") {
doProcessGetEditMap(request, reply);
}
else if (request.m_method == "POST") {
doProcessPostEditMap(request, reply);
}
else {
throw XHTTPAllow("GET, HEAD, POST");
}
}
else {
// unknown page
throw XHTTP(404);
}
}
void
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CHTTPServer::doProcessGetEditMap(CHTTPRequest& /*request*/, CHTTPReply& reply)
{
static const char* s_editMapProlog1 =
"<html>\r\n"
"<head>\r\n"
" <title>Synergy -- Edit Screens</title>\r\n"
"</head>\r\n"
"<body>\r\n"
" <form method=\"POST\" action=\"editmap\" "
"enctype=\"multipart/form-data\">\r\n"
" <input type=hidden name=\"size\" value=\"";
static const char* s_editMapProlog2 =
"\">\r\n";
static const char* s_editMapEpilog =
" <input type=submit name=\"submit\">\r\n"
" <input type=reset>\r\n"
" <br>\r\n"
" </form>\r\n"
"</body>\r\n"
"</html>\r\n";
static const char* s_editMapTableProlog =
"<table border=\"1\" cellspacing=\"0\" cellpadding=\"0\"><tr><td>"
" <table border=\"0\" cellspacing=\"2\" cellpadding=\"6\">\r\n";
static const char* s_editMapTableEpilog =
" </table>"
"</td></tr></table>\r\n";
static const char* s_editMapRowProlog =
"<tr align=\"center\" valign=\"top\">\r\n";
static const char* s_editMapRowEpilog =
"</tr>\r\n";
static const char* s_editMapScreenDummy =
"<td>";
static const char* s_editMapScreenPrimary =
"<td bgcolor=\"#2222288\"><input type=\"text\" readonly value=\"";
static const char* s_editMapScreenLive =
"<td bgcolor=\"#cccccc\"><input type=\"text\" value=\"";
static const char* s_editMapScreenDead =
"<td><input type=\"text\" value=\"";
static const char* s_editMapScreenLiveDead1 =
"\" size=\"16\" maxlength=\"64\" name=\"";
static const char* s_editMapScreenLiveDead2 =
"\">";
static const char* s_editMapScreenEnd =
"</td>\r\n";
std::ostringstream s;
// convert screen map into a temporary screen map
CScreenArray screens;
{
CConfig config;
m_server->getConfig(&config);
screens.convertFrom(config);
// FIXME -- note to user if config couldn't be exactly represented
}
// insert blank columns and rows around array (to allow the user
// to insert new screens)
screens.insertColumn(0);
screens.insertColumn(screens.getWidth());
screens.insertRow(0);
screens.insertRow(screens.getHeight());
// get array size
const SInt32 w = screens.getWidth();
const SInt32 h = screens.getHeight();
// construct reply
reply.m_body += s_editMapProlog1;
s << w << "x" << h;
reply.m_body += s.str();
reply.m_body += s_editMapProlog2;
// add screen map for editing
const CString primaryName = m_server->getPrimaryScreenName();
reply.m_body += s_editMapTableProlog;
for (SInt32 y = 0; y < h; ++y) {
reply.m_body += s_editMapRowProlog;
for (SInt32 x = 0; x < w; ++x) {
s.str("");
if (!screens.isAllowed(x, y) && screens.get(x, y) != primaryName) {
s << s_editMapScreenDummy;
}
else {
if (!screens.isSet(x, y)) {
s << s_editMapScreenDead;
}
else if (screens.get(x, y) == primaryName) {
s << s_editMapScreenPrimary;
}
else {
s << s_editMapScreenLive;
}
s << screens.get(x, y) <<
s_editMapScreenLiveDead1 <<
"n" << x << "x" << y <<
s_editMapScreenLiveDead2;
}
s << s_editMapScreenEnd;
reply.m_body += s.str();
}
reply.m_body += s_editMapRowEpilog;
}
reply.m_body += s_editMapTableEpilog;
reply.m_body += s_editMapEpilog;
}
void
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CHTTPServer::doProcessPostEditMap(CHTTPRequest& request, CHTTPReply& reply)
{
typedef std::vector<CString> ScreenArray;
typedef std::set<CString> ScreenSet;
// parse the result
CHTTPProtocol::CFormParts parts;
if (!CHTTPProtocol::parseFormData(request, parts)) {
log((CLOG_WARN "editmap: cannot parse form data"));
throw XHTTP(400);
}
try {
std::ostringstream s;
// convert post data into a temporary screen map. also check
// that no screen name is invalid or used more than once.
SInt32 w, h;
CHTTPProtocol::CFormParts::iterator index = parts.find("size");
if (index == parts.end() ||
!parseXY(index->second, w, h) ||
w <= 0 || h <= 0) {
log((CLOG_WARN "editmap: cannot parse size or size is invalid"));
throw XHTTP(400);
}
ScreenSet screenNames;
CScreenArray screens;
screens.resize(w, h);
for (SInt32 y = 0; y < h; ++y) {
for (SInt32 x = 0; x < w; ++x) {
// find part
s.str("");
s << "n" << x << "x" << y;
index = parts.find(s.str());
if (index == parts.end()) {
// FIXME -- screen is missing. error?
continue;
}
// skip blank names
const CString& name = index->second;
if (name.empty()) {
continue;
}
// check name. name must be legal and must not have
// already been seen.
if (screenNames.count(name)) {
// FIXME -- better error message
log((CLOG_WARN "editmap: duplicate name %s", name.c_str()));
throw XHTTP(400);
}
// FIXME -- check that name is legal
// save name. if we've already seen the name then
// report an error.
screens.set(x, y, name);
screenNames.insert(name);
}
}
// if new map is invalid then return error. map is invalid if:
// there are no screens, or
// the screens are not 4-connected.
if (screenNames.empty()) {
// no screens
// FIXME -- need better no screens
log((CLOG_WARN "editmap: no screens"));
throw XHTTP(400);
}
if (!screens.isValid()) {
// FIXME -- need better unconnected screens error
log((CLOG_WARN "editmap: unconnected screens"));
throw XHTTP(400);
}
// convert temporary screen map into a regular map
CConfig config;
m_server->getConfig(&config);
screens.convertTo(config);
// set new screen map on server
m_server->setConfig(config);
// now reply with current map
doProcessGetEditMap(request, reply);
}
catch (XHTTP&) {
// FIXME -- construct a more meaningful error?
throw;
}
}
bool
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CHTTPServer::parseXY(const CString& xy, SInt32& x, SInt32& y)
{
std::istringstream s(xy);
char delimiter;
s >> x;
s.get(delimiter);
s >> y;
return (!!s && delimiter == 'x');
}
//
// CHTTPServer::CScreenArray
//
CHTTPServer::CScreenArray::CScreenArray() :
m_w(0),
m_h(0)
{
// do nothing
}
CHTTPServer::CScreenArray::~CScreenArray()
{
// do nothing
}
void
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CHTTPServer::CScreenArray::resize(SInt32 w, SInt32 h)
{
m_screens.clear();
m_screens.resize(w * h);
m_w = w;
m_h = h;
}
void
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CHTTPServer::CScreenArray::insertRow(SInt32 i)
{
assert(i >= 0 && i <= m_h);
CNames newScreens;
newScreens.resize(m_w * (m_h + 1));
for (SInt32 y = 0; y < i; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
newScreens[x + y * m_w] = m_screens[x + y * m_w];
}
}
for (SInt32 y = i; y < m_h; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
newScreens[x + (y + 1) * m_w] = m_screens[x + y * m_w];
}
}
m_screens.swap(newScreens);
++m_h;
}
void
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CHTTPServer::CScreenArray::insertColumn(SInt32 i)
{
assert(i >= 0 && i <= m_w);
CNames newScreens;
newScreens.resize((m_w + 1) * m_h);
for (SInt32 y = 0; y < m_h; ++y) {
for (SInt32 x = 0; x < i; ++x) {
newScreens[x + y * (m_w + 1)] = m_screens[x + y * m_w];
}
for (SInt32 x = i; x < m_w; ++x) {
newScreens[(x + 1) + y * (m_w + 1)] = m_screens[x + y * m_w];
}
}
m_screens.swap(newScreens);
++m_w;
}
void
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CHTTPServer::CScreenArray::eraseRow(SInt32 i)
{
assert(i >= 0 && i < m_h);
CNames newScreens;
newScreens.resize(m_w * (m_h - 1));
for (SInt32 y = 0; y < i; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
newScreens[x + y * m_w] = m_screens[x + y * m_w];
}
}
for (SInt32 y = i + 1; y < m_h; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
newScreens[x + (y - 1) * m_w] = m_screens[x + y * m_w];
}
}
m_screens.swap(newScreens);
--m_h;
}
void
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CHTTPServer::CScreenArray::eraseColumn(SInt32 i)
{
assert(i >= 0 && i < m_w);
CNames newScreens;
newScreens.resize((m_w - 1) * m_h);
for (SInt32 y = 0; y < m_h; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
newScreens[x + y * (m_w - 1)] = m_screens[x + y * m_w];
}
for (SInt32 x = i + 1; x < m_w; ++x) {
newScreens[(x - 1) + y * (m_w - 1)] = m_screens[x + y * m_w];
}
}
m_screens.swap(newScreens);
--m_w;
}
void
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CHTTPServer::CScreenArray::rotateRows(SInt32 i)
{
// nothing to do if no rows
if (m_h == 0) {
return;
}
// convert to canonical form
if (i < 0) {
i = m_h - ((-i) % m_h);
}
else {
i %= m_h;
}
if (i == 0 || i == m_h) {
return;
}
while (i > 0) {
// rotate one row
for (SInt32 x = 0; x < m_w; ++x) {
CString tmp = m_screens[x];
for (SInt32 y = 1; y < m_h; ++y) {
m_screens[x + (y - 1) * m_w] = m_screens[x + y * m_w];
}
m_screens[x + (m_h - 1) * m_w] = tmp;
}
}
}
void
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CHTTPServer::CScreenArray::rotateColumns(SInt32 i)
{
// nothing to do if no columns
if (m_h == 0) {
return;
}
// convert to canonical form
if (i < 0) {
i = m_w - ((-i) % m_w);
}
else {
i %= m_w;
}
if (i == 0 || i == m_w) {
return;
}
while (i > 0) {
// rotate one column
for (SInt32 y = 0; y < m_h; ++y) {
CString tmp = m_screens[0 + y * m_w];
for (SInt32 x = 1; x < m_w; ++x) {
m_screens[x - 1 + y * m_w] = m_screens[x + y * m_w];
}
m_screens[m_w - 1 + y * m_w] = tmp;
}
}
}
void
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CHTTPServer::CScreenArray::remove(SInt32 x, SInt32 y)
{
set(x, y, CString());
}
void
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CHTTPServer::CScreenArray::set(SInt32 x, SInt32 y, const CString& name)
{
assert(x >= 0 && x < m_w);
assert(y >= 0 && y < m_h);
m_screens[x + y * m_w] = name;
}
bool
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CHTTPServer::CScreenArray::isAllowed(SInt32 x, SInt32 y) const
{
assert(x >= 0 && x < m_w);
assert(y >= 0 && y < m_h);
if (x > 0 && !m_screens[(x - 1) + y * m_w].empty()) {
return true;
}
if (x < m_w - 1 && !m_screens[(x + 1) + y * m_w].empty()) {
return true;
}
if (y > 0 && !m_screens[x + (y - 1) * m_w].empty()) {
return true;
}
if (y < m_h - 1 && !m_screens[x + (y + 1) * m_w].empty()) {
return true;
}
return false;
}
bool
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CHTTPServer::CScreenArray::isSet(SInt32 x, SInt32 y) const
{
assert(x >= 0 && x < m_w);
assert(y >= 0 && y < m_h);
return !m_screens[x + y * m_w].empty();
}
CString
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CHTTPServer::CScreenArray::get(SInt32 x, SInt32 y) const
{
assert(x >= 0 && x < m_w);
assert(y >= 0 && y < m_h);
return m_screens[x + y * m_w];
}
bool
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CHTTPServer::CScreenArray::find(const CString& name,
SInt32& xOut, SInt32& yOut) const
{
for (SInt32 y = 0; y < m_h; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
if (m_screens[x + y * m_w] == name) {
xOut = x;
yOut = y;
return true;
}
}
}
return false;
}
bool
CHTTPServer::CScreenArray::isValid() const
{
SInt32 count = 0, isolated = 0;
for (SInt32 y = 0; y < m_h; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
if (isSet(x, y)) {
++count;
if (!isAllowed(x, y)) {
++isolated;
}
}
}
}
return (count <= 1 || isolated == 0);
}
bool
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CHTTPServer::CScreenArray::convertFrom(const CConfig& config)
{
typedef std::set<CString> ScreenSet;
// insert the first screen
CConfig::const_iterator index = config.begin();
if (index == config.end()) {
// no screens
resize(0, 0);
return true;
}
CString name = *index;
resize(1, 1);
set(0, 0, name);
// flood fill state
CNames screenStack;
ScreenSet doneSet;
// put all but the first screen on the stack
// note -- if all screens are 4-connected then we can skip this
while (++index != config.end()) {
screenStack.push_back(*index);
}
// put the first screen on the stack last so we process it first
screenStack.push_back(name);
// perform a flood fill using the stack as the seeds
while (!screenStack.empty()) {
// get next screen from stack
CString name = screenStack.back();
screenStack.pop_back();
// skip screen if we've seen it before
if (doneSet.count(name) > 0) {
continue;
}
// add this screen to doneSet so we don't process it again
doneSet.insert(name);
// find the screen. if it's not found then not all of the
// screens are 4-connected. discard disconnected screens.
SInt32 x, y;
if (!find(name, x, y)) {
continue;
}
// insert the screen's neighbors
// FIXME -- handle edge wrapping
CString neighbor;
neighbor = config.getNeighbor(name, kLeft);
if (!neighbor.empty() && doneSet.count(neighbor) == 0) {
// insert left neighbor, adding a column if necessary
if (x == 0 || get(x - 1, y) != neighbor) {
++x;
insertColumn(x - 1);
set(x - 1, y, neighbor);
}
screenStack.push_back(neighbor);
}
neighbor = config.getNeighbor(name, kRight);
if (!neighbor.empty() && doneSet.count(neighbor) == 0) {
// insert right neighbor, adding a column if necessary
if (x == m_w - 1 || get(x + 1, y) != neighbor) {
insertColumn(x + 1);
set(x + 1, y, neighbor);
}
screenStack.push_back(neighbor);
}
neighbor = config.getNeighbor(name, kTop);
if (!neighbor.empty() && doneSet.count(neighbor) == 0) {
// insert top neighbor, adding a row if necessary
if (y == 0 || get(x, y - 1) != neighbor) {
++y;
insertRow(y - 1);
set(x, y - 1, neighbor);
}
screenStack.push_back(neighbor);
}
neighbor = config.getNeighbor(name, kBottom);
if (!neighbor.empty() && doneSet.count(neighbor) == 0) {
// insert bottom neighbor, adding a row if necessary
if (y == m_h - 1 || get(x, y + 1) != neighbor) {
insertRow(y + 1);
set(x, y + 1, neighbor);
}
screenStack.push_back(neighbor);
}
}
// check symmetry
// FIXME -- handle edge wrapping
for (index = config.begin(); index != config.end(); ++index) {
const CString& name = *index;
SInt32 x, y;
if (!find(name, x, y)) {
return false;
}
CString neighbor;
neighbor = config.getNeighbor(name, kLeft);
if ((x == 0 && !neighbor.empty()) ||
(x > 0 && get(x - 1, y) != neighbor)) {
return false;
}
neighbor = config.getNeighbor(name, kRight);
if ((x == m_w - 1 && !neighbor.empty()) ||
(x < m_w - 1 && get(x + 1, y) != neighbor)) {
return false;
}
neighbor = config.getNeighbor(name, kTop);
if ((y == 0 && !neighbor.empty()) ||
(y > 0 && get(x, y - 1) != neighbor)) {
return false;
}
neighbor = config.getNeighbor(name, kBottom);
if ((y == m_h - 1 && !neighbor.empty()) ||
(y < m_h - 1 && get(x, y + 1) != neighbor)) {
return false;
}
}
return true;
}
void
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CHTTPServer::CScreenArray::convertTo(CConfig& config) const
{
config.removeAllScreens();
// add screens and find smallest box containing all screens
SInt32 x0 = m_w, x1 = 0, y0 = m_h, y1 = 0;
for (SInt32 y = 0; y < m_h; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
if (isSet(x, y)) {
config.addScreen(get(x, y));
if (x < x0) {
x0 = x;
}
if (x > x1) {
x1 = x;
}
if (y < y0) {
y0 = y;
}
if (y > y1) {
y1 = y;
}
}
}
}
// make connections between screens
// FIXME -- add support for wrapping
// FIXME -- mark topmost and leftmost screens
for (SInt32 y = 0; y < m_h; ++y) {
for (SInt32 x = 0; x < m_w; ++x) {
if (!isSet(x, y)) {
continue;
}
if (x > x0 && isSet(x - 1, y)) {
config.connect(get(x, y), kLeft, get(x - 1, y));
}
if (x < x1 && isSet(x + 1, y)) {
config.connect(get(x, y), kRight, get(x + 1, y));
}
if (y > y0 && isSet(x, y - 1)) {
config.connect(get(x, y), kTop, get(x, y - 1));
}
if (y < y1 && isSet(x, y + 1)) {
config.connect(get(x, y), kBottom, get(x, y + 1));
}
}
}
}