2.54
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 int ct = 0;
54 const xs_val *v;
55
56 while (xs_list_next(args, &v, &ct)) {
57 xs *kv = xs_split_n(v, "=", 1);
58
59 if (xs_list_len(kv) == 2) {
60 const char *key = xs_list_get(kv, 0);
61 const char *pv = xs_dict_get(vars, key);
62
63 if (!xs_is_null(pv)) {
64 /* there is a previous value: convert to a list and append */
65 xs *vlist = NULL;
66 if (xs_type(pv) == XSTYPE_LIST)
67 vlist = xs_dup(pv);
68 else {
69 vlist = xs_list_new();
70 vlist = xs_list_append(vlist, pv);
71 }
72
73 vlist = xs_list_append(vlist, xs_list_get(kv, 1));
74 vars = xs_dict_set(vars, key, vlist);
75 }
76 else {
77 /* ends with []? force to always be a list */
78 if (xs_endswith(key, "[]")) {
79 xs *vlist = xs_list_new();
80 vlist = xs_list_append(vlist, xs_list_get(kv, 1));
81 vars = xs_dict_append(vars, key, vlist);
82 }
83 else
84 vars = xs_dict_append(vars, key, xs_list_get(kv, 1));
85 }
86 }
87 }
88 }
89
90 return vars;
91}
92
93
94xs_dict *xs_multipart_form_data(const char *payload, int p_size, const char *header)
95/* parses a multipart/form-data payload */
96{
97 xs *boundary = NULL;
98 int offset = 0;
99 int bsz;
100 char *p;
101
102 /* build the boundary string */
103 {
104 xs *l1 = xs_split(header, "=");
105
106 if (xs_list_len(l1) != 2)
107 return NULL;
108
109 boundary = xs_dup(xs_list_get(l1, 1));
110
111 /* Tokodon sends the boundary header with double quotes surrounded */
112 if (xs_starts_and_ends("\"", boundary, "\"") != 0)
113 boundary = xs_strip_chars_i(boundary, "\"");
114
115 boundary = xs_fmt("--%s", boundary);
116 }
117
118 bsz = strlen(boundary);
119
120 xs_dict *p_vars = xs_dict_new();
121
122 /* iterate searching the boundaries */
123 while ((p = xs_memmem(payload + offset, p_size - offset, boundary, bsz)) != NULL) {
124 xs *s1 = NULL;
125 xs *l1 = NULL;
126 const char *vn = NULL;
127 const char *fn = NULL;
128 const char *ct = NULL;
129 char *q;
130 int po, ps;
131
132 /* final boundary? */
133 p += bsz;
134
135 if (p[0] == '-' && p[1] == '-')
136 break;
137
138 /* skip the \r\n */
139 p += 2;
140
141 /* Tokodon sends also a Content-Type headers,
142 let's use it to determine the file type */
143 do {
144 if (p[0] == 13 && p[1] == 10)
145 break;
146 q = strchr(p, '\r');
147 s1 = xs_realloc(NULL, q - p + 1);
148 memcpy(s1, p, q - p);
149 s1[q - p] = '\0';
150
151 if (xs_startswith(s1, "Content-Disposition")) {
152 /* split by " like a primitive man */
153 l1 = xs_split(s1, "\"");
154
155 /* get the variable name */
156 vn = xs_list_get(l1, 1);
157
158 /* is it an attached file? */
159 if (xs_list_len(l1) >= 4 && strcmp(xs_list_get(l1, 2), "; filename=") == 0) {
160 /* get the file name */
161 fn = xs_list_get(l1, 3);
162 }
163 }
164 else
165 if (xs_startswith(s1, "Content-Type")) {
166 l1 = xs_split(s1, ":");
167
168 if (xs_list_len(l1) >= 2) {
169 ct = xs_lstrip_chars_i(xs_dup(xs_list_get(l1, 1)), " ");
170 }
171 }
172
173 p += (q - p);
174 p += 2; // Skip /r/n
175 } while (1);
176
177 /* find the start of the part content */
178 if ((p = xs_memmem(p, p_size - (p - payload), "\r\n", 2)) == NULL)
179 break;
180
181 p += 2; // Skip empty line
182
183 /* find the next boundary */
184 if ((q = xs_memmem(p, p_size - (p - payload), boundary, bsz)) == NULL)
185 break;
186
187 po = p - payload;
188 ps = q - p - 2; /* - 2 because the final \r\n */
189
190 /* is it a filename? */
191 if (fn != NULL) {
192 /* p_var value is a list */
193 /* if filename has no extension and content-type is image, attach extension to the filename */
194 if (strchr(fn, '.') == NULL && xs_startswith(ct, "image/")) {
195 char *ext = strchr(ct, '/');
196 ext++;
197 fn = xs_str_cat(xs_str_new(""), fn, ".", ext);
198 }
199
200 xs *l1 = xs_list_new();
201 xs *vpo = xs_number_new(po);
202 xs *vps = xs_number_new(ps);
203
204 l1 = xs_list_append(l1, fn);
205 l1 = xs_list_append(l1, vpo);
206 l1 = xs_list_append(l1, vps);
207
208 p_vars = xs_dict_append(p_vars, vn, l1);
209 }
210 else {
211 /* regular variable; just copy */
212 xs *vc = xs_realloc(NULL, ps + 1);
213 memcpy(vc, payload + po, ps);
214 vc[ps] = '\0';
215
216 p_vars = xs_dict_append(p_vars, vn, vc);
217 }
218
219 /* move on */
220 offset = q - payload;
221 }
222
223 return p_vars;
224}
225
226
227#endif /* XS_IMPLEMENTATION */
228
229#endif /* XS_URL_H */
