net/src/WebServer.cpp

00001 // ------------------------------------------------------------------
00002 // pion-net: a C++ framework for building lightweight HTTP interfaces
00003 // ------------------------------------------------------------------
00004 // Copyright (C) 2007-2008 Atomic Labs, Inc.  (http://www.atomiclabs.com)
00005 //
00006 // Distributed under the Boost Software License, Version 1.0.
00007 // See http://www.boost.org/LICENSE_1_0.txt
00008 //
00009 
00010 #include <pion/net/WebServer.hpp>
00011 #include <pion/net/HTTPRequest.hpp>
00012 #include <pion/net/HTTPRequestReader.hpp>
00013 #include <pion/net/HTTPResponseWriter.hpp>
00014 #include <pion/net/HTTPBasicAuth.hpp>
00015 #include <pion/net/HTTPCookieAuth.hpp>
00016 #include <fstream>
00017 
00018 
00019 namespace pion {    // begin namespace pion
00020 namespace net {     // begin namespace net (Pion Network Library)
00021 
00022 
00023 // WebServer member functions
00024 
00025 void WebServer::addService(const std::string& resource, WebService *service_ptr)
00026 {
00027     PionPluginPtr<WebService> plugin_ptr;
00028     const std::string clean_resource(stripTrailingSlash(resource));
00029     service_ptr->setResource(clean_resource);
00030     // catch exceptions thrown by services since their exceptions may be free'd
00031     // from memory before they are caught
00032     try {
00033         m_services.add(clean_resource, service_ptr);
00034         HTTPServer::addResource(clean_resource, boost::ref(*service_ptr));
00035     } catch (std::exception& e) {
00036         throw WebServiceException(resource, e.what());
00037     }
00038     PION_LOG_INFO(m_logger, "Loaded static web service for resource (" << clean_resource << ")");
00039 }
00040 
00041 void WebServer::loadService(const std::string& resource, const std::string& service_name)
00042 {
00043     const std::string clean_resource(stripTrailingSlash(resource));
00044     WebService *service_ptr;
00045     // catch exceptions thrown by services since their exceptions may be free'd
00046     // from memory before they are caught
00047     try {
00048         service_ptr = m_services.load(clean_resource, service_name);
00049         HTTPServer::addResource(clean_resource, boost::ref(*service_ptr));
00050         service_ptr->setResource(clean_resource);
00051     } catch (std::exception& e) {
00052         throw WebServiceException(resource, e.what());
00053     }
00054     PION_LOG_INFO(m_logger, "Loaded web service plug-in for resource (" << clean_resource << "): " << service_name);
00055 }
00056 
00057 void WebServer::setServiceOption(const std::string& resource,
00058                                  const std::string& name, const std::string& value)
00059 {
00060     // catch exceptions thrown by services since their exceptions may be free'd
00061     // from memory before they are caught
00062     const std::string clean_resource(stripTrailingSlash(resource));
00063     try {
00064         m_services.run(clean_resource, boost::bind(&WebService::setOption, _1, name, value));
00065     } catch (PluginManager<WebService>::PluginNotFoundException&) {
00066         throw ServiceNotFoundException(resource);
00067     } catch (std::exception& e) {
00068         throw WebServiceException(resource, e.what());
00069     }
00070     PION_LOG_INFO(m_logger, "Set web service option for resource ("
00071                   << resource << "): " << name << '=' << value);
00072 }
00073 
00074 void WebServer::loadServiceConfig(const std::string& config_name)
00075 {
00076     std::string config_file;
00077     if (! PionPlugin::findConfigFile(config_file, config_name))
00078         throw ConfigNotFoundException(config_name);
00079     
00080     // open the file for reading
00081     std::ifstream config_stream;
00082     config_stream.open(config_file.c_str(), std::ios::in);
00083     if (! config_stream.is_open())
00084         throw ConfigParsingException(config_name);
00085     
00086     // parse the contents of the file
00087     HTTPAuthPtr auth_ptr;
00088     enum ParseState {
00089         PARSE_NEWLINE, PARSE_COMMAND, PARSE_RESOURCE, PARSE_VALUE, PARSE_COMMENT, PARSE_USERNAME
00090     } parse_state = PARSE_NEWLINE;
00091     std::string command_string;
00092     std::string resource_string;
00093     std::string username_string;
00094     std::string value_string;
00095     std::string option_name_string;
00096     std::string option_value_string;
00097     int c = config_stream.get();    // read the first character
00098     
00099     while (config_stream) {
00100         switch(parse_state) {
00101         case PARSE_NEWLINE:
00102             // parsing command portion (or beginning of line)
00103             if (c == '#') {
00104                 // line is a comment
00105                 parse_state = PARSE_COMMENT;
00106             } else if (isalpha(c)) {
00107                 // first char in command
00108                 parse_state = PARSE_COMMAND;
00109                 // ignore case for commands
00110                 command_string += tolower(c);
00111             } else if (c != '\r' && c != '\n') {    // check for blank lines
00112                 throw ConfigParsingException(config_name);
00113             }
00114             break;
00115             
00116         case PARSE_COMMAND:
00117             // parsing command portion (or beginning of line)
00118             if (c == ' ' || c == '\t') {
00119                 // command finished -> check if valid
00120                 if (command_string=="path" || command_string=="auth" || command_string=="restrict") {
00121                     value_string.clear();
00122                     parse_state = PARSE_VALUE;
00123                 } else if (command_string=="service" || command_string=="option") {
00124                     resource_string.clear();
00125                     parse_state = PARSE_RESOURCE;
00126                 } else if (command_string=="user") {
00127                     username_string.clear();
00128                     parse_state = PARSE_USERNAME;
00129                 } else {
00130                     throw ConfigParsingException(config_name);
00131                 }
00132             } else if (! isalpha(c)) {
00133                 // commands may only contain alpha chars
00134                 throw ConfigParsingException(config_name);
00135             } else {
00136                 // ignore case for commands
00137                 command_string += tolower(c);
00138             }
00139             break;
00140 
00141         case PARSE_RESOURCE:
00142             // parsing resource portion (/hello)
00143             if (c == ' ' || c == '\t') {
00144                 // check for leading whitespace
00145                 if (! resource_string.empty()) {
00146                     // resource finished
00147                     value_string.clear();
00148                     parse_state = PARSE_VALUE;
00149                 }
00150             } else if (c == '\r' || c == '\n') {
00151                 // line truncated before value
00152                 throw ConfigParsingException(config_name);
00153             } else {
00154                 // add char to resource
00155                 resource_string += c;
00156             }
00157             break;
00158         
00159         case PARSE_USERNAME:
00160             // parsing username for user command
00161             if (c == ' ' || c == '\t') {
00162                 // check for leading whitespace
00163                 if (! username_string.empty()) {
00164                     // username finished
00165                     value_string.clear();
00166                     parse_state = PARSE_VALUE;
00167                 }
00168             } else if (c == '\r' || c == '\n') {
00169                 // line truncated before value
00170                 throw AuthConfigException("No username defined for user parameter");
00171             } else {
00172                 // add char to username
00173                 username_string += c;
00174             }
00175             break;
00176         
00177         case PARSE_VALUE:
00178             // parsing value portion
00179             if (c == '\r' || c == '\n') {
00180                 // value is finished
00181                 if (value_string.empty()) {
00182                     // value must not be empty
00183                     throw ConfigParsingException(config_name);
00184                 } else if (command_string == "path") {
00185                     // finished path command
00186                     try { PionPlugin::addPluginDirectory(value_string); }
00187                     catch (std::exception& e) {
00188                         PION_LOG_WARN(m_logger, e.what());
00189                     }
00190                 } else if (command_string == "auth") {
00191                     // finished auth command
00192                     PionUserManagerPtr user_manager(new PionUserManager);
00193                     if (value_string == "basic"){
00194                         auth_ptr.reset(new HTTPBasicAuth(user_manager));
00195                     }
00196                     else if (value_string == "cookie"){
00197                         auth_ptr.reset(new HTTPCookieAuth(user_manager));
00198                     }
00199                     else{
00200                         throw AuthConfigException("Only basic and cookie authentications are supported");
00201                     }
00202                 } else if (command_string == "restrict") {
00203                     // finished restrict command
00204                     if (! auth_ptr)
00205                         throw AuthConfigException("Authentication type must be defined before restrict");
00206                     else if (value_string.empty())
00207                         throw AuthConfigException("No service defined for restrict parameter");
00208                     auth_ptr->addRestrict(value_string);
00209                 } else if (command_string == "user") {
00210                     // finished user command
00211                     if (! auth_ptr)
00212                         throw AuthConfigException("Authentication type must be defined before users");
00213                     else if (value_string.empty())
00214                         throw AuthConfigException("No password defined for user parameter");
00215                     auth_ptr->addUser(username_string, value_string);
00216                 } else if (command_string == "service") {
00217                     // finished service command
00218                     loadService(resource_string, value_string);
00219                 } else if (command_string == "option") {
00220                     // finished option command
00221                     std::string::size_type pos = value_string.find('=');
00222                     if (pos == std::string::npos)
00223                         throw ConfigParsingException(config_name);
00224                     option_name_string = value_string.substr(0, pos);
00225                     option_value_string = value_string.substr(pos + 1);
00226                     setServiceOption(resource_string, option_name_string,
00227                                      option_value_string);
00228                 }
00229                 command_string.clear();
00230                 parse_state = PARSE_NEWLINE;
00231             } else if (c == ' ' || c == '\t') {
00232                 // only skip leading whitespace (value may contain spaces, etc)
00233                 if (! value_string.empty())
00234                     value_string += c;
00235             } else {
00236                 // add char to value
00237                 value_string += c;
00238             }
00239             break;
00240         
00241         case PARSE_COMMENT:
00242             // skipping comment line
00243             if (c == '\r' || c == '\n')
00244                 parse_state = PARSE_NEWLINE;
00245             break;
00246         }
00247 
00248         // read the next character
00249         c = config_stream.get();
00250     }
00251     
00252     // update authentication configuration for the server
00253     setAuthentication(auth_ptr);
00254 }
00255 
00256 }   // end namespace net
00257 }   // end namespace pion
00258 

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