1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
package httprc
import "regexp"
// Whitelist is an interface for a set of URL whitelists. When provided
// to fetching operations, urls are checked against this object, and
// the object must return true for urls to be fetched.
type Whitelist interface {
IsAllowed(string) bool
}
// InsecureWhitelist allows any URLs to be fetched.
type InsecureWhitelist struct{}
func (InsecureWhitelist) IsAllowed(string) bool {
return true
}
// RegexpWhitelist is a httprc.Whitelist object comprised of a list of *regexp.Regexp
// objects. All entries in the list are tried until one matches. If none of the
// *regexp.Regexp objects match, then the URL is deemed unallowed.
type RegexpWhitelist struct {
patterns []*regexp.Regexp
}
func NewRegexpWhitelist() *RegexpWhitelist {
return &RegexpWhitelist{}
}
func (w *RegexpWhitelist) Add(pat *regexp.Regexp) *RegexpWhitelist {
w.patterns = append(w.patterns, pat)
return w
}
// IsAlloed returns true if any of the patterns in the whitelist
// returns true.
func (w *RegexpWhitelist) IsAllowed(u string) bool {
for _, pat := range w.patterns {
if pat.MatchString(u) {
return true
}
}
return false
}
// MapWhitelist is a httprc.Whitelist object comprised of a map of strings.
// If the URL exists in the map, then the URL is allowed to be fetched.
type MapWhitelist struct {
store map[string]struct{}
}
func NewMapWhitelist() *MapWhitelist {
return &MapWhitelist{store: make(map[string]struct{})}
}
func (w *MapWhitelist) Add(pat string) *MapWhitelist {
w.store[pat] = struct{}{}
return w
}
func (w *MapWhitelist) IsAllowed(u string) bool {
_, b := w.store[u]
return b
}
// WhitelistFunc is a httprc.Whitelist object based on a function.
// You can perform any sort of check against the given URL to determine
// if it can be fetched or not.
type WhitelistFunc func(string) bool
func (w WhitelistFunc) IsAllowed(u string) bool {
return w(u)
}
|
