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1/**\file http.h
2 * Describe a Hyper Text Transfer Protocol processor. This class will allow
3 * any program to act as either an HTTP server, client, or both. It contains
4 * a number of additional helpers and subclasses.
5 *@author Mike Buland
6 */
7
8#ifndef HTTP_H
9#define HTTP_H
10
11#include <iostream>
12#include "connection.h"
13#include "linkedlist.h"
14#include "hashtable.h"
15
16#define CR '\r' /**< The ASCII value of a Carrage Return */
17#define LF '\n' /**< The ASCII value of a Line Feed */
18#define CRLF CR LF /**< Combo of CR+LF for use in http */
19
20/**
21 * Macro to create combined http version codes. This just makes processing a
22 * little bit faster for the most part.
23 *@param maj Major version number, between 0 and 15
24 *@param min Minor version number, between 0 and 15
25 *@returns A one byte combined version number suitable for use in switches.
26 */
27#define HTTPVER( maj, min ) ((maj<<4)|(min))
28
29#define HTTP10 HTTPVER( 1, 0 ) /**< Combined version code for http 1.0 */
30#define HTTP11 HTTPVER( 1, 1 ) /**< Combined version code for http 1.1 */
31
32/**
33 * This is the master HTTP processing class. One instance handles one
34 * transaction, in the future a different mechanism may be thought up, but for
35 * now this means that you must create multiple objects to handle a single
36 * connection that contains multiple requests.
37 * In the constructor the Http class is given a connection object. This object
38 * should already be initialized and connected to whatever socket it wants to
39 * be sending and receiving data to and from. Once that's done you can call
40 * parseRequest if you're acting as a server, or a variety of buildRequest
41 * functions to create and send a request if you're a client.
42 * Please note that this class does not provide any HTTP or extended format
43 * processing systems, but will allow for mime types tables to be registered.
44 *@author Mike Buland
45 */
46class Http
47{
48public:
49 /**
50 * Create an Http object tied to an existing connection object.
51 *@param pConnection The live connection object to deal with.
52 */
53 Http( Connection *pConnection );
54
55 /**
56 * Standard Deconstructor.
57 */
58 virtual ~Http();
59
60 /**
61 * Perform all parsing needed to figure out what an HTTP client wants from
62 * us. This will setup a number of properties in the Http object itself
63 * and has the possibility of setting one or more response states initially.
64 * These states should be checked for immediately after parsing to see if
65 * an appropriate error message should be generated. These errors can
66 * include issues with protocol, data formats, or unknown versions of the
67 * protocol.
68 *@returns True means that all processing is finished, false means that
69 * the parseRequest function should be called again when more data is
70 * ready. A return value of true does not indicate success, only that
71 * processing is finished, the getResponseStatus function should be called
72 * to see what status was set in the parse routine. A 200 indicates that
73 * as far as the parser is concerned, everything when smoothly. Otherwise
74 * it's your responsibility to build the appropriate error response body
75 * (like an html file) and send it as the response.
76 */
77 bool parseRequest();
78
79 /**
80 * Get a request type's internal Http object id based on the string
81 * representation. These can be any HTTP/1.1 standard request type.
82 *@param sType The string that should be checked for type. This is in all
83 * caps, just like if it came from the HTTP client, which is most often
84 * the case.
85 *@returns The numerical ID of the given request type. Please note that
86 * HTTP/1.1 standard specifies that any string is valid here as long as
87 * the non-basic string is a request type understood by the serving
88 * software. This means that anything that is non-standard will return
89 * a type reqExtension and not an error. This is not a mistake.
90 */
91 short getRequestType( const char *sType );
92
93 /**
94 * Get the string representation of an Http object request type integer ID.
95 * This is used mainly for debugging to be sure the system has what we
96 * think it has.
97 *@param nType The integer ID of the request type to process.
98 *@returns The HTTP/1.1 string representation of that Http object ID code.
99 */
100 const char *getRequestType( short nType );
101
102 /**
103 * Returns the Http object request type ID code that is stored in the
104 * object by either the parseRequest function or use of the buildRequest
105 * functions.
106 *@returns The ID of the request type stored in the object.
107 */
108 short getRequestType();
109
110 /**
111 * Same as getRequestType, only returns the string representation.
112 *@returns The string representation of the request type ID stored in the
113 * object.
114 */
115 const char *getRequestTypeStr();
116
117 /**
118 * Sets the version of the request used by the system. This will be used
119 * by parse request, but is also part of the buildRequest tool functions.
120 *@param nMajor The major version number.
121 *@param nMinor The minor version number.
122 */
123 void setRequestVersion( unsigned char nMajor, unsigned char nMinor );
124
125 /**
126 * Gets the major version number of the protocol used/to be used in this
127 * request.
128 *@returns The major version number of the request protocol.
129 */
130 unsigned char getRequestMinorVer();
131
132 /**
133 * Gets the minor version number of the protocol used/to be used in this
134 * request.
135 *@returns The minor version number of the request protocol.
136 */
137 unsigned char getRequestMajorVer();
138
139 /**
140 * Checks the stored request version against an internal table of supported
141 * protocol versions.
142 *@returns True if the protocol version is supported, false otherwise.
143 */
144 bool checkRequestVer();
145
146 /**
147 * Converts an arbitrary string to a new string object with space saving
148 * operations performed ala the HTTP/1.1 specs. All leading and trailing
149 * whitespace is stripped, and all whitespace within the string is reduced
150 * to a single space char.
151 *@param sStr A pointer to the string data to process.
152 *@param nLen The length of the string to process. Since this function is
153 * often called on stream data, there is no null terminator where we need
154 * one. This is here for convinience so the data doesn't need to be hacked
155 * up or moved to an intermediate buffer.
156 *@returns A new string that may well be shorter than the original but that
157 * will have the same value as far as the HTTP/1.1 specs are concerned.
158 */
159 std::string *convSpaceString( const char *sStr, int nLen );
160
161 /**
162 * Gets a string pointer to the URI that was/is being requested. This can
163 * be any RFC standard URI, with or without protocol and domain.
164 *@returns A pointer to the URI that was/is being requested.
165 */
166 const char *getRequestURI();
167
168 /**
169 * Set a new response status. This status can be anything that the HTTP
170 * specs allow. Other values are allowed as well, but beware, not all
171 * servers/clients will accept values that are not in the tables in this
172 * class.
173 *@param nStatus The status to set.
174 */
175 void setResponseStatus( short nStatus );
176
177 bool buildResponse( short nResponseCode=-1, const char *sResponse=NULL );
178 void setResponseContent( const char *sMime, const char *sContent, int nLen );
179 void setResponsePersistant( bool bPersistant );
180 bool sendResponse();
181
182 enum
183 {
184 reqOptions,
185 reqGet,
186 reqHead,
187 reqPost,
188 reqPut,
189 reqDelete,
190 reqTrace,
191 reqConnect,
192 reqExtension
193 };
194
195 enum
196 {
197 statusContinue = 100,
198 statusSwitchProto = 101,
199
200 statusOK = 200,
201 statusCreated = 201,
202 statusAccepted = 202,
203 statusNonAuthInfo = 203,
204 statusNoContent = 204,
205 statusResetContent = 205,
206 statusPartialContent = 206,
207
208 statusMultiChoices = 300,
209 statusMovedPermanently = 301,
210 statusFound = 302,
211 statusSeeOther = 303,
212 statusNotModified = 304,
213 statusUseProxy = 305,
214 statusUnused = 306,
215 statusTempRedirect = 307,
216
217 statusBadRequest = 400,
218 statusUnauthorized = 401,
219 statusPaymentRequired = 402,
220 statusForbidden = 403,
221 statusNotFound = 404,
222 statusMethodNotAllowed = 405,
223 statusNotAcceptable = 406,
224 statusProxyAuthRequired = 407,
225 statusRequestTimeout = 408,
226 statusConflict = 409,
227 statusGone = 410,
228 statusLengthRequired = 411,
229 statusPreconditionFailed = 412,
230 statusRequestEntityTooLarge = 413,
231 statusRequestURITooLong = 414,
232 statusUnsupportedMediaType = 415,
233 statusRequestedRangeNotSatisfiable = 416,
234 statusExpectationFailed = 417,
235
236 statusInternalServerError = 500,
237 statusNotImplemented = 501,
238 statusBadGateway = 502,
239 statusServiceUnavailable = 503,
240 statusGatewayTimeout = 504,
241 statusHTTPVersionNotSupported = 505
242 };
243
244 const char *getHeader( const char *lpStr );
245
246private:
247 Connection *pCon;
248 unsigned char nParseState;
249
250 short nReqType;
251 std::string *pReqStr;
252 std::string sReqURI;
253 unsigned char cReqVersion;
254 HashTable hReqHeader;
255 LinkedList lStrings;
256
257 std::string sServerStr;
258 std::string sResMime;
259 std::string sResContent;
260 std::string sResStatusStr;
261 bool bResPersistant;
262 struct tm tResTime;
263 short nResStatus;
264
265 enum
266 {
267 parseInit,
268 parseHeader,
269 parseFinished
270 };
271};
272
273#endif
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