validate.gno

 1package arena
 2
 3// The string rules below are what makes the hand-built JSON and the markdown
 4// of this realm safe: every string that is stored and later printed went
 5// through one of them, and none of them lets a quote, a backslash, a pipe, a
 6// bracket or a control character in. They are the rules of the game realm.
 7
 8const ticketLen = 64 // a SHA-256 in hex
 9
10// validTicket reports whether s is 64 lowercase hex characters, the SHA-256
11// of the secret a player's client keeps.
12func validTicket(s string) bool {
13	if len(s) != ticketLen {
14		return false
15	}
16	for i := 0; i < len(s); i++ {
17		c := s[i]
18		if !(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f') {
19			return false
20		}
21	}
22	return true
23}
24
25// validAddress reports whether addr is a valid address in its canonical,
26// lowercase form.
27//
28// Bech32 can also be written in all capitals, and address.IsValid accepts
29// that. Bech32 does not allow mixing cases, so looking at the first character
30// is enough.
31func validAddress(addr address) bool {
32	return addr.IsValid() && addr[0] == 'g'
33}
34
35// indexOfAddr returns the index of addr in list, -1 when it is not there.
36// The lists of this realm hold at most 16 addresses.
37func indexOfAddr(list []address, addr address) int {
38	for i, a := range list {
39		if a == addr {
40			return i
41		}
42	}
43	return -1
44}