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net/gcoap: add Uri-Query handling for requests

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This commit is contained in:
Hauke Petersen 2017-07-24 17:57:53 +02:00
parent e00efcca42
commit 8f577eca4c
2 changed files with 55 additions and 5 deletions
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21
sys/include/net/gcoap.h
View File

@ -242,9 +242,9 @@ extern "C" {
* @brief Size of the buffer used to write options, other than Uri-Path, in a
* request
*
* Accommodates Content-Format.
* Accommodates Content-Format and Uri-Queries
*/
#define GCOAP_REQ_OPTIONS_BUF (8)
#define GCOAP_REQ_OPTIONS_BUF (40)
/**
* @brief Size of the buffer used to write options in a response
@ -654,6 +654,23 @@ uint8_t gcoap_op_state(void);
*/
int gcoap_get_resource_list(void *buf, size_t maxlen, uint8_t cf);
/**
* @brief Adds a single Uri-Query option to a CoAP request
*
* To add multiple Uri-Query options, simply call this function multiple times.
* The Uri-Query options will be added in the order those calls.
*
* @param[out] pdu The package that is being build
* @param[in] key Key to add to the query string
* @param[in] val Value to assign to @p key (may be NULL)
*
* @pre ((pdu != NULL) && (key != NULL))
*
* @return overall length of new query string
* @return -1 on error
*/
int gcoap_add_qstring(coap_pkt_t *pdu, const char *key, const char *val);
#ifdef __cplusplus
}
#endif

39
sys/net/application_layer/coap/gcoap.c
View File

@ -440,7 +440,8 @@ static ssize_t _write_options(coap_pkt_t *pdu, uint8_t *buf, size_t len)
DEBUG("gcoap: _write_options: path does not start with '/'\n");
return -EINVAL;
}
bufpos += coap_put_option_url(bufpos, last_optnum, (char *)&pdu->url[0]);
bufpos += coap_put_option_uri(bufpos, last_optnum, (char *)pdu->url,
COAP_OPT_URI_PATH);
last_optnum = COAP_OPT_URI_PATH;
}
}
@ -448,8 +449,15 @@ static ssize_t _write_options(coap_pkt_t *pdu, uint8_t *buf, size_t len)
/* Content-Format */
if (pdu->content_type != COAP_FORMAT_NONE) {
bufpos += coap_put_option_ct(bufpos, last_optnum, pdu->content_type);
/* uncomment when add an option after Content-Format */
/* last_optnum = COAP_OPT_CONTENT_FORMAT; */
last_optnum = COAP_OPT_CONTENT_FORMAT;
}
/* Uri-query for requests */
if (coap_get_code_class(pdu) == COAP_CLASS_REQ) {
bufpos += coap_put_option_uri(bufpos, last_optnum, (char *)pdu->qs,
COAP_OPT_URI_QUERY);
/* uncomment when further options are added below ... */
/* last_optnum = COAP_OPT_URI_QUERY; */
}
/* write payload marker */
@ -602,6 +610,7 @@ int gcoap_req_init(coap_pkt_t *pdu, uint8_t *buf, size_t len, unsigned code,
pdu->hdr = (coap_hdr_t *)buf;
memset(pdu->url, 0, NANOCOAP_URL_MAX);
memset(pdu->qs, 0, NANOCOAP_QS_MAX);
/* generate token */
#if GCOAP_TOKENLEN
@ -839,4 +848,28 @@ int gcoap_get_resource_list(void *buf, size_t maxlen, uint8_t cf)
return (int)pos;
}
int gcoap_add_qstring(coap_pkt_t *pdu, const char *key, const char *val)
{
size_t qs_len = strlen((char *)pdu->qs);
size_t key_len = strlen(key);
size_t val_len = (val) ? (strlen(val) + 1) : 0;
/* make sure if url_len + the new query string fit into the url buffer */
if ((qs_len + key_len + val_len + 2) >= NANOCOAP_QS_MAX) {
return -1;
}
pdu->qs[qs_len++] = '&';
memcpy(&pdu->qs[qs_len], key, key_len);
qs_len += key_len;
if (val) {
pdu->qs[qs_len++] = '=';
memcpy(&pdu->qs[qs_len], val, val_len);
qs_len += val_len;
}
pdu->qs[qs_len] = '\0';
return (int)qs_len;
}
/** @} */