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/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
#ifndef _XS_URL_H
#define _XS_URL_H
xs_str *xs_url_dec(const char *str);
xs_dict *xs_url_vars(const char *str);
xs_dict *xs_multipart_form_data(const char *payload, int p_size, const char *header);
#ifdef XS_IMPLEMENTATION
xs_str *xs_url_dec(const char *str)
/* decodes an URL */
{
xs_str *s = xs_str_new(NULL);
while (*str) {
if (*str == '%') {
int i;
if (sscanf(str + 1, "%02x", &i) == 1) {
unsigned char uc = i;
s = xs_append_m(s, (char *)&uc, 1);
str += 2;
}
}
else
if (*str == '+')
s = xs_append_m(s, " ", 1);
else
s = xs_append_m(s, str, 1);
str++;
}
return s;
}
xs_dict *xs_url_vars(const char *str)
/* parse url variables */
{
xs_dict *vars;
vars = xs_dict_new();
if (str != NULL) {
/* split by arguments */
xs *args = xs_split(str, "&");
int ct = 0;
const xs_val *v;
while (xs_list_next(args, &v, &ct)) {
xs *kv = xs_split_n(v, "=", 1);
if (xs_list_len(kv) == 2) {
const char *key = xs_list_get(kv, 0);
const char *pv = xs_dict_get(vars, key);
if (!xs_is_null(pv)) {
/* there is a previous value: convert to a list and append */
xs *vlist = NULL;
if (xs_type(pv) == XSTYPE_LIST)
vlist = xs_dup(pv);
else {
vlist = xs_list_new();
vlist = xs_list_append(vlist, pv);
}
vlist = xs_list_append(vlist, xs_list_get(kv, 1));
vars = xs_dict_set(vars, key, vlist);
}
else {
/* ends with []? force to always be a list */
if (xs_endswith(key, "[]")) {
xs *vlist = xs_list_new();
vlist = xs_list_append(vlist, xs_list_get(kv, 1));
vars = xs_dict_append(vars, key, vlist);
}
else
vars = xs_dict_append(vars, key, xs_list_get(kv, 1));
}
}
}
}
return vars;
}
xs_dict *xs_multipart_form_data(const char *payload, int p_size, const char *header)
/* parses a multipart/form-data payload */
{
xs *boundary = NULL;
int offset = 0;
int bsz;
char *p;
/* build the boundary string */
{
xs *l1 = xs_split(header, "=");
if (xs_list_len(l1) != 2)
return NULL;
boundary = xs_dup(xs_list_get(l1, 1));
/* Tokodon sends the boundary header with double quotes surrounded */
if (xs_starts_and_ends("\"", boundary, "\"") != 0)
boundary = xs_strip_chars_i(boundary, "\"");
boundary = xs_fmt("--%s", boundary);
}
bsz = strlen(boundary);
xs_dict *p_vars = xs_dict_new();
/* iterate searching the boundaries */
while ((p = xs_memmem(payload + offset, p_size - offset, boundary, bsz)) != NULL) {
xs *s1 = NULL;
xs *l1 = NULL;
const char *vn = NULL;
const char *fn = NULL;
char *q;
int po, ps;
/* final boundary? */
p += bsz;
if (p[0] == '-' && p[1] == '-')
break;
/* skip the \r\n */
p += 2;
/* now on a Content-Disposition... line; get it */
q = strchr(p, '\r');
s1 = xs_realloc(NULL, q - p + 1);
memcpy(s1, p, q - p);
s1[q - p] = '\0';
/* move on (over a \r\n) */
p = q;
/* split by " like a primitive man */
l1 = xs_split(s1, "\"");
/* get the variable name */
vn = xs_list_get(l1, 1);
/* is it an attached file? */
if (xs_list_len(l1) >= 4 && strcmp(xs_list_get(l1, 2), "; filename=") == 0) {
/* get the file name */
fn = xs_list_get(l1, 3);
}
/* find the start of the part content */
if ((p = xs_memmem(p, p_size - (p - payload), "\r\n\r\n", 4)) == NULL)
break;
p += 4;
/* find the next boundary */
if ((q = xs_memmem(p, p_size - (p - payload), boundary, bsz)) == NULL)
break;
po = p - payload;
ps = q - p - 2; /* - 2 because the final \r\n */
/* is it a filename? */
if (fn != NULL) {
/* p_var value is a list */
xs *l1 = xs_list_new();
xs *vpo = xs_number_new(po);
xs *vps = xs_number_new(ps);
l1 = xs_list_append(l1, fn);
l1 = xs_list_append(l1, vpo);
l1 = xs_list_append(l1, vps);
p_vars = xs_dict_append(p_vars, vn, l1);
}
else {
/* regular variable; just copy */
xs *vc = xs_realloc(NULL, ps + 1);
memcpy(vc, payload + po, ps);
vc[ps] = '\0';
p_vars = xs_dict_append(p_vars, vn, vc);
}
/* move on */
offset = q - payload;
}
return p_vars;
}
#endif /* XS_IMPLEMENTATION */
#endif /* XS_URL_H */
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