57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
package core
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import (
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"unicode"
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"unicode/utf8"
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)
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// IsNicknameAcceptable returns true for strings that are usable as contact nicknames.
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// A nickname is acceptable if it:
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// - Is composed of only valid UTF-8 sequences
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// - Has between 1 and MaxNicknameLength unicode characters
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// - Doesn't contain any characters from unicode Cf or Cc
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// - Doesn't contain any of these HTML-sensitive characters: "<>&\
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// - XXX This could use more thought on valid codepoints; note that Go
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// has a good set of built-in range tables in `unicode`
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func IsNicknameAcceptable(nickname string) bool {
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length := 0
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blacklist := []rune{'"', '<', '>', '&', '\\'}
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for len(nickname) > 0 {
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r, sz := utf8.DecodeRuneInString(nickname)
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if r == utf8.RuneError {
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return false
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}
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if unicode.In(r, unicode.Cf, unicode.Cc) {
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return false
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}
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for _, br := range blacklist {
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if r == br {
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return false
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}
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}
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length++
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if length > MaxNicknameLength {
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return false
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}
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nickname = nickname[sz:]
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}
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return length > 0
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}
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// IsMessageAcceptable returns true for strings that are usable as chat messages.
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// A message is acceptable if it:
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// - Is composed of only valid UTF-8 sequences
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// - Encodes to between 1 and MaxMessageLength bytes in UTF-8
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// - XXX This also needs more thought on valid unicode characters
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func IsMessageAcceptable(message string) bool {
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return len(message) > 0 &&
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len(message) <= MaxMessageLength &&
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utf8.ValidString(message)
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}
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