snac2/xs_curl.h
2022-09-19 23:08:59 +02:00

178 lines
4.2 KiB
C

/* copyright (c) 2022 grunfink - MIT license */
#ifndef _XS_CURL_H
#define _XS_CURL_H
d_char *xs_http_request(char *method, char *url, d_char *headers,
d_char *body, int b_size,
int *status, d_char **payload, int *p_size);
#ifdef XS_IMPLEMENTATION
#include <curl/curl.h>
static size_t _header_callback(char *buffer, size_t size,
size_t nitems, d_char **userdata)
{
d_char *headers = *userdata;
xs *l;
/* get the line */
l = xs_str_new(NULL);
l = xs_append_m(l, buffer, size * nitems);
l = xs_strip(l);
/* only the HTTP/x 200 line and the last one doesn't have ': ' */
if (xs_str_in(l, ": ") != -1) {
xs *knv = xs_split_n(l, ": ", 1);
headers = xs_dict_append(headers, xs_list_get(knv, 0), xs_list_get(knv, 1));
}
else
if (xs_startswith(l, "HTTP/"))
headers = xs_dict_append(headers, "_proto", l);
*userdata = headers;
return nitems * size;
}
struct _payload_data {
char *data;
int size;
int offset;
};
static int _data_callback(void *buffer, size_t size,
size_t nitems, struct _payload_data *pd)
{
int sz = size * nitems;
/* open space */
pd->size += sz;
pd->data = realloc(pd->data, pd->size + 1);
/* copy data */
memcpy(pd->data + pd->offset, buffer, sz);
pd->offset += sz;
return sz;
}
static int _post_callback(char *buffer, size_t size,
size_t nitems, struct _payload_data *pd)
{
/* size of data left */
int sz = pd->size - pd->offset;
/* if it's still bigger than the provided space, trim */
if (sz > size * nitems)
sz = size * nitems;
memcpy(buffer, pd->data + pd->offset, sz);
/* skip sent data */
pd->offset += sz;
return sz;
}
d_char *xs_http_request(char *method, char *url, d_char *headers,
d_char *body, int b_size,
int *status, d_char **payload, int *p_size)
/* does an HTTP request */
{
d_char *response;
CURL *curl;
struct curl_slist *list = NULL;
char *k, *v, *p;
long lstatus;
response = xs_dict_new();
curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 5L);
/* force HTTP/1.1 */
curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
/* obey redirections */
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
/* store response headers here */
curl_easy_setopt(curl, CURLOPT_HEADERDATA, &response);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, _header_callback);
struct _payload_data ipd = { NULL, 0, 0 };
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ipd);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, _data_callback);
if (strcmp(method, "POST") == 0) {
curl_easy_setopt(curl, CURLOPT_POST, 1L);
if (body != NULL) {
if (b_size <= 0)
b_size = xs_size(body);
/* add the content-length header */
char tmp[32];
sprintf(tmp, "content-length: %d", b_size);
list = curl_slist_append(list, tmp);
struct _payload_data pd = { body, b_size, 0 };
curl_easy_setopt(curl, CURLOPT_READDATA, &pd);
curl_easy_setopt(curl, CURLOPT_READFUNCTION, _post_callback);
}
}
/* fill the request headers */
p = headers;
while (xs_dict_iter(&p, &k, &v)) {
xs *h;
const char *args[] = { k, v, NULL };
h = xs_fmt("%s: %s", args);
list = curl_slist_append(list, h);
}
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
/* do it */
curl_easy_perform(curl);
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &lstatus);
curl_easy_cleanup(curl);
if (status != NULL)
*status = (int) lstatus;
if (p_size != NULL)
*p_size = ipd.size;
if (payload != NULL) {
*payload = ipd.data;
/* add an asciiz just in case (but not touching p_size) */
if (ipd.data != NULL)
ipd.data[ipd.size] = '\0';
}
else
free(ipd.data);
return response;
}
#endif /* XS_IMPLEMENTATION */
#endif /* _XS_CURL_H */