Viewing file:  lws-spa.h (6.29 KB) -rw-rw-r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* included from libwebsockets.h
*/
/** \defgroup form-parsing Form Parsing
* \ingroup http
* ##POSTed form parsing functions
*
* These lws_spa (stateful post arguments) apis let you parse and urldecode
* POSTed form arguments, both using simple urlencoded and multipart transfer
* encoding.
*
* It's capable of handling file uploads as well a named input parsing,
* and the apis are the same for both form upload styles.
*
* You feed it a list of parameter names and it creates pointers to the
* urldecoded arguments: file upload parameters pass the file data in chunks to
* a user-supplied callback as they come.
*
* Since it's stateful, it handles the incoming data needing more than one
* POST_BODY callback and has no limit on uploaded file size.
*/
///@{
/** enum lws_spa_fileupload_states */
enum lws_spa_fileupload_states {
LWS_UFS_CONTENT,
/**< a chunk of file content has arrived */
LWS_UFS_FINAL_CONTENT,
/**< the last chunk (possibly zero length) of file content has arrived */
LWS_UFS_OPEN,
/**< a new file is starting to arrive */
LWS_UFS_CLOSE
/**< the file decode stuff is being destroyed */
};
/**
* lws_spa_fileupload_cb() - callback to receive file upload data
*
* \param data: opt_data pointer set in lws_spa_create
* \param name: name of the form field being uploaded
* \param filename: original filename from client
* \param buf: start of data to receive
* \param len: length of data to receive
* \param state: information about how this call relates to file
*
* Notice name and filename shouldn't be trusted, as they are passed from
* HTTP provided by the client.
*/
typedef int (*lws_spa_fileupload_cb)(void *data, const char *name,
const char *filename, char *buf, int len,
enum lws_spa_fileupload_states state);
/** struct lws_spa - opaque urldecode parser capable of handling multipart
* and file uploads */
struct lws_spa;
/**
* lws_spa_create() - create urldecode parser
*
* \param wsi: lws connection (used to find Content Type)
* \param param_names: array of form parameter names, like "username"
* \param count_params: count of param_names
* \param max_storage: total amount of form parameter values we can store
* \param opt_cb: NULL, or callback to receive file upload data.
* \param opt_data: NULL, or user pointer provided to opt_cb.
*
* Creates a urldecode parser and initializes it.
*
* It's recommended to use the newer api, lws_spa_create_via_info()
* instead.
*
* opt_cb can be NULL if you just want normal name=value parsing, however
* if one or more entries in your form are bulk data (file transfer), you
* can provide this callback and filter on the name callback parameter to
* treat that urldecoded data separately. The callback should return -1
* in case of fatal error, and 0 if OK.
*/
LWS_VISIBLE LWS_EXTERN struct lws_spa *
lws_spa_create(struct lws *wsi, const char * const *param_names,
int count_params, int max_storage, lws_spa_fileupload_cb opt_cb,
void *opt_data);
typedef struct lws_spa_create_info {
const char * const *param_names; /* array of form parameter names, like "username" */
int count_params; /* count of param_names */
int max_storage; /* total amount of form parameter values we can store */
lws_spa_fileupload_cb opt_cb; /* NULL, or callback to receive file upload data. */
void *opt_data; /* NULL, or user pointer provided to opt_cb. */
size_t param_names_stride; /* 0 if param_names is an array of char *.
Else stride to next char * */
struct lwsac **ac; /* NULL, or pointer to lwsac * to contain all
related heap allocations */
size_t ac_chunk_size; /* 0 for default, or ac chunk size */
} lws_spa_create_info_t;
/**
* lws_spa_create_via_info() - create urldecode parser
*
* \param wsi: lws connection (used to find Content Type)
* \param info: pointer to struct defining the arguments
*
* Creates a urldecode parser and initializes it.
*
* opt_cb can be NULL if you just want normal name=value parsing, however
* if one or more entries in your form are bulk data (file transfer), you
* can provide this callback and filter on the name callback parameter to
* treat that urldecoded data separately. The callback should return -1
* in case of fatal error, and 0 if OK.
*/
LWS_VISIBLE LWS_EXTERN struct lws_spa *
lws_spa_create_via_info(struct lws *wsi, const lws_spa_create_info_t *info);
/**
* lws_spa_process() - parses a chunk of input data
*
* \param spa: the parser object previously created
* \param in: incoming urlencoded data
* \param len: count of bytes valid at \p in
*/
LWS_VISIBLE LWS_EXTERN int
lws_spa_process(struct lws_spa *spa, const char *in, int len);
/**
* lws_spa_finalize() - indicate incoming data completed
*
* \param spa: the parser object previously created
*/
LWS_VISIBLE LWS_EXTERN int
lws_spa_finalize(struct lws_spa *spa);
/**
* lws_spa_get_length() - return length of parameter value
*
* \param spa: the parser object previously created
* \param n: parameter ordinal to return length of value for
*/
LWS_VISIBLE LWS_EXTERN int
lws_spa_get_length(struct lws_spa *spa, int n);
/**
* lws_spa_get_string() - return pointer to parameter value
* \param spa: the parser object previously created
* \param n: parameter ordinal to return pointer to value for
*/
LWS_VISIBLE LWS_EXTERN const char *
lws_spa_get_string(struct lws_spa *spa, int n);
/**
* lws_spa_destroy() - destroy parser object
*
* \param spa: the parser object previously created
*/
LWS_VISIBLE LWS_EXTERN int
lws_spa_destroy(struct lws_spa *spa);
///@}
|