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