freshlybakedca.ke
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1#include "git-compat-util.h"
2#include "hex-ll.h"
3#include "strbuf.h"
4#include "url.h"
5
6int is_urlschemechar(int first_flag, int ch)
7{
8 /*
9 * The set of valid URL schemes, as per STD66 (RFC3986) is
10 * '[A-Za-z][A-Za-z0-9+.-]*'. But use slightly looser check
11 * of '[A-Za-z0-9][A-Za-z0-9+.-]*' because earlier version
12 * of check used '[A-Za-z0-9]+' so not to break any remote
13 * helpers.
14 */
15 int alphanumeric, special;
16 alphanumeric = ch > 0 && isalnum(ch);
17 special = ch == '+' || ch == '-' || ch == '.';
18 return alphanumeric || (!first_flag && special);
19}
20
21int is_url(const char *url)
22{
23 /* Is "scheme" part reasonable? */
24 if (!url || !is_urlschemechar(1, *url++))
25 return 0;
26 while (*url && *url != ':') {
27 if (!is_urlschemechar(0, *url++))
28 return 0;
29 }
30 /* We've seen "scheme"; we want colon-slash-slash */
31 return (url[0] == ':' && url[1] == '/' && url[2] == '/');
32}
33
34static char *url_decode_internal(const char **query, int len,
35 const char *stop_at, struct strbuf *out,
36 int decode_plus)
37{
38 const char *q = *query;
39
40 while (len) {
41 unsigned char c = *q;
42
43 if (!c)
44 break;
45 if (stop_at && strchr(stop_at, c)) {
46 q++;
47 len--;
48 break;
49 }
50
51 if (c == '%' && (len < 0 || len >= 3)) {
52 int val = hex2chr(q + 1);
53 if (0 < val) {
54 strbuf_addch(out, val);
55 q += 3;
56 len -= 3;
57 continue;
58 }
59 }
60
61 if (decode_plus && c == '+')
62 strbuf_addch(out, ' ');
63 else
64 strbuf_addch(out, c);
65 q++;
66 len--;
67 }
68 *query = q;
69 return strbuf_detach(out, NULL);
70}
71
72char *url_decode(const char *url)
73{
74 return url_decode_mem(url, strlen(url));
75}
76
77char *url_decode_mem(const char *url, int len)
78{
79 struct strbuf out = STRBUF_INIT;
80 const char *colon = memchr(url, ':', len);
81
82 /* Skip protocol part if present */
83 if (colon && url < colon) {
84 strbuf_add(&out, url, colon - url);
85 len -= colon - url;
86 url = colon;
87 }
88 return url_decode_internal(&url, len, NULL, &out, 0);
89}
90
91char *url_percent_decode(const char *encoded)
92{
93 struct strbuf out = STRBUF_INIT;
94 return url_decode_internal(&encoded, strlen(encoded), NULL, &out, 0);
95}
96
97char *url_decode_parameter_name(const char **query)
98{
99 struct strbuf out = STRBUF_INIT;
100 return url_decode_internal(query, -1, "&=", &out, 1);
101}
102
103char *url_decode_parameter_value(const char **query)
104{
105 struct strbuf out = STRBUF_INIT;
106 return url_decode_internal(query, -1, "&", &out, 1);
107}
108
109void end_url_with_slash(struct strbuf *buf, const char *url)
110{
111 strbuf_addstr(buf, url);
112 strbuf_complete(buf, '/');
113}
114
115void str_end_url_with_slash(const char *url, char **dest)
116{
117 struct strbuf buf = STRBUF_INIT;
118 end_url_with_slash(&buf, url);
119 free(*dest);
120 *dest = strbuf_detach(&buf, NULL);
121}