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Validate hostname part of email address according to rfc2396

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Hicham Boushaba 2018-06-20 16:50:56 +01:00 committed by cketti
parent fe0e55f49c
commit f994562b47
1 changed files with 10 additions and 6 deletions
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16
app/core/src/main/java/com/fsck/k9/EmailAddressValidator.kt
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@ -14,14 +14,18 @@ class EmailAddressValidator : Validator {
fun isValidAddressOnly(text: CharSequence): Boolean = EMAIL_ADDRESS_PATTERN.matcher(text).matches()
companion object {
//https://www.rfc-editor.org/rfc/rfc2396.txt (3.2.2)
private const val ALPHA = "[a-zA-Z]"
private const val ALPHANUM = "[a-zA-Z0-9]"
private const val TOP_LABEL = "(($ALPHA($ALPHANUM|\\-|_)*$ALPHANUM)|$ALPHA)"
private const val DOMAIN_LABEL = "(($ALPHANUM($ALPHANUM|\\-|_)*$ALPHANUM)|$ALPHANUM)"
private const val HOST_NAME = "((($DOMAIN_LABEL\\.)+$TOP_LABEL)|$DOMAIN_LABEL)"
private val EMAIL_ADDRESS_PATTERN = Pattern.compile(
"[a-zA-Z0-9\\+\\.\\_\\%\\-]{1,256}" +
"\\@" +
"[a-zA-Z0-9][a-zA-Z0-9\\-]{0,64}" +
"(" +
"\\." +
"[a-zA-Z0-9][a-zA-Z0-9\\-]{0,25}" +
")+"
"\\@$HOST_NAME"
)
}
}