gno.land/r/g1t2kg2vtr3fukg43eujkn6x53gfdyakhngt4sfd/gnofly/nfts/skins⧉

1package skins23// The string rules below are what makes the hand-built JSON and the markdown4// of this realm safe: every string that is stored and later printed went5// through one of them, and none of them lets a quote, a backslash, a pipe, a6// bracket or a control character in.78const (9	maxIDLen    = 3210	maxModelLen = 1611	maxNameLen  = 4012)1314// validID reports whether s matches [a-z0-9-]{1,32}.15func validID(s string) bool {16	return isSlug(s, maxIDLen)17}1819// validModel reports whether s matches [a-z0-9-]{1,16}.20func validModel(s string) bool {21	return isSlug(s, maxModelLen)22}2324// validName reports whether s matches [A-Za-z0-9 '.!-]{1,40}. The charset is25// deliberately narrow so that a name can be embedded in JSON and markdown26// without escaping.27func validName(s string) bool {28	if len(s) == 0 || len(s) > maxNameLen {29		return false30	}31	for i := 0; i < len(s); i++ {32		c := s[i]33		switch {34		case c >= 'a' && c <= 'z', c >= 'A' && c <= 'Z', c >= '0' && c <= '9':35		case c == ' ', c == '\'', c == '.', c == '!', c == '-':36		default:37			return false38		}39	}40	return true41}4243// validColor reports whether s is "#rrggbb" with lowercase hex digits.44func validColor(s string) bool {45	if len(s) != 7 || s[0] != '#' {46		return false47	}48	for i := 1; i < len(s); i++ {49		c := s[i]50		if !(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f') {51			return false52		}53	}54	return true55}5657// validAddress reports whether addr is a valid address in its canonical,58// lowercase form.59//60// Bech32 can also be written in all capitals, and address.IsValid accepts61// that. To this realm the capitals would be a second key for the same62// account: a second player record, a second line on a leaderboard, an admin63// who can never be matched to a caller. Bech32 does not allow mixing cases,64// so looking at the first character is enough.65func validAddress(addr address) bool {66	return addr.IsValid() && addr[0] == 'g'67}6869// isSlug reports whether s is 1 to max characters of [a-z0-9-].70func isSlug(s string, max int) bool {71	if len(s) == 0 || len(s) > max {72		return false73	}74	for i := 0; i < len(s); i++ {75		c := s[i]76		if !(c >= 'a' && c <= 'z') && !(c >= '0' && c <= '9') && c != '-' {77			return false78		}79	}80	return true81}82