2.58
xs_url.h
1/* copyright (c) 2022 - 2024 grunfink et al. / MIT license */
2
3#ifndef _XS_URL_H
4
5#define _XS_URL_H
6
7xs_str *xs_url_dec(const char *str);
8xs_dict *xs_url_vars(const char *str);
9xs_dict *xs_multipart_form_data(const char *payload, int p_size, const char *header);
10
11#ifdef XS_IMPLEMENTATION
12
13xs_str *xs_url_dec(const char *str)
14/* decodes an URL */
15{
16 xs_str *s = xs_str_new(NULL);
17
18 while (*str) {
19 if (*str == '%') {
20 int i;
21
22 if (sscanf(str + 1, "%02x", &i) == 1) {
23 unsigned char uc = i;
24
25 s = xs_append_m(s, (char *)&uc, 1);
26 str += 2;
27 }
28 }
29 else
30 if (*str == '+')
31 s = xs_append_m(s, " ", 1);
32 else
33 s = xs_append_m(s, str, 1);
34
35 str++;
36 }
37
38 return s;
39}
40
41
42xs_dict *xs_url_vars(const char *str)
43/* parse url variables */
44{
45 xs_dict *vars;
46
47 vars = xs_dict_new();
48
49 if (str != NULL) {
50 /* split by arguments */
51 xs *args = xs_split(str, "&");
52
53 const xs_val *v;
54
55 xs_list_foreach(args, v) {
56 xs *kv = xs_split_n(v, "=", 1);
57
58 if (xs_list_len(kv) == 2) {
59 const char *key = xs_list_get(kv, 0);
60 const char *pv = xs_dict_get(vars, key);
61
62 if (!xs_is_null(pv)) {
63 /* there is a previous value: convert to a list and append */
64 xs *vlist = NULL;
65 if (xs_type(pv) == XSTYPE_LIST)
66 vlist = xs_dup(pv);
67 else {
68 vlist = xs_list_new();
69 vlist = xs_list_append(vlist, pv);
70 }
71
72 vlist = xs_list_append(vlist, xs_list_get(kv, 1));
73 vars = xs_dict_set(vars, key, vlist);
74 }
75 else {
76 /* ends with []? force to always be a list */
77 if (xs_endswith(key, "[]")) {
78 xs *vlist = xs_list_new();
79 vlist = xs_list_append(vlist, xs_list_get(kv, 1));
80 vars = xs_dict_append(vars, key, vlist);
81 }
82 else
83 vars = xs_dict_append(vars, key, xs_list_get(kv, 1));
84 }
85 }
86 }
87 }
88
89 return vars;
90}
91
92
93xs_dict *xs_multipart_form_data(const char *payload, int p_size, const char *header)
94/* parses a multipart/form-data payload */
95{
96 xs *boundary = NULL;
97 int offset = 0;
98 int bsz;
99 char *p;
100
101 /* build the boundary string */
102 {
103 xs *l1 = xs_split(header, "=");
104
105 if (xs_list_len(l1) != 2)
106 return NULL;
107
108 boundary = xs_dup(xs_list_get(l1, 1));
109
110 /* Tokodon sends the boundary header with double quotes surrounded */
111 if (xs_between("\"", boundary, "\"") != 0)
112 boundary = xs_strip_chars_i(boundary, "\"");
113
114 boundary = xs_fmt("--%s", boundary);
115 }
116
117 bsz = strlen(boundary);
118
119 xs_dict *p_vars = xs_dict_new();
120
121 /* iterate searching the boundaries */
122 while ((p = xs_memmem(payload + offset, p_size - offset, boundary, bsz)) != NULL) {
123 xs *s1 = NULL;
124 xs *l1 = NULL;
125 const char *vn = NULL;
126 const char *fn = NULL;
127 const char *ct = NULL;
128 char *q;
129 int po, ps;
130
131 /* final boundary? */
132 p += bsz;
133
134 if (p[0] == '-' && p[1] == '-')
135 break;
136
137 /* skip the \r\n */
138 p += 2;
139
140 /* Tokodon sends also a Content-Type headers,
141 let's use it to determine the file type */
142 do {
143 if (p[0] == 13 && p[1] == 10)
144 break;
145 q = strchr(p, '\r');
146 s1 = xs_realloc(NULL, q - p + 1);
147 memcpy(s1, p, q - p);
148 s1[q - p] = '\0';
149
150 if (xs_startswith(s1, "Content-Disposition")) {
151 /* split by " like a primitive man */
152 l1 = xs_split(s1, "\"");
153
154 /* get the variable name */
155 vn = xs_list_get(l1, 1);
156
157 /* is it an attached file? */
158 if (xs_list_len(l1) >= 4 && strcmp(xs_list_get(l1, 2), "; filename=") == 0) {
159 /* get the file name */
160 fn = xs_list_get(l1, 3);
161 }
162 }
163 else
164 if (xs_startswith(s1, "Content-Type")) {
165 l1 = xs_split(s1, ":");
166
167 if (xs_list_len(l1) >= 2) {
168 ct = xs_lstrip_chars_i(xs_dup(xs_list_get(l1, 1)), " ");
169 }
170 }
171
172 p += (q - p);
173 p += 2; // Skip /r/n
174 } while (1);
175
176 /* find the start of the part content */
177 if ((p = xs_memmem(p, p_size - (p - payload), "\r\n", 2)) == NULL)
178 break;
179
180 p += 2; // Skip empty line
181
182 /* find the next boundary */
183 if ((q = xs_memmem(p, p_size - (p - payload), boundary, bsz)) == NULL)
184 break;
185
186 po = p - payload;
187 ps = q - p - 2; /* - 2 because the final \r\n */
188
189 /* is it a filename? */
190 if (fn != NULL) {
191 /* p_var value is a list */
192 /* if filename has no extension and content-type is image, attach extension to the filename */
193 if (strchr(fn, '.') == NULL && xs_startswith(ct, "image/")) {
194 char *ext = strchr(ct, '/');
195 ext++;
196 fn = xs_str_cat(xs_str_new(""), fn, ".", ext);
197 }
198
199 xs *l1 = xs_list_new();
200 xs *vpo = xs_number_new(po);
201 xs *vps = xs_number_new(ps);
202
203 l1 = xs_list_append(l1, fn);
204 l1 = xs_list_append(l1, vpo);
205 l1 = xs_list_append(l1, vps);
206
207 p_vars = xs_dict_append(p_vars, vn, l1);
208 }
209 else {
210 /* regular variable; just copy */
211 xs *vc = xs_realloc(NULL, ps + 1);
212 memcpy(vc, payload + po, ps);
213 vc[ps] = '\0';
214
215 p_vars = xs_dict_append(p_vars, vn, vc);
216 }
217
218 /* move on */
219 offset = q - payload;
220 }
221
222 return p_vars;
223}
224
225
226#endif /* XS_IMPLEMENTATION */
227
228#endif /* XS_URL_H */
