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# frozen_string_literal: true
module JSONSchemer
module Format
module Email
# https://datatracker.ietf.org/doc/html/rfc6531#section-3.3
# I think this is the same as "UTF8-non-ascii"? (https://datatracker.ietf.org/doc/html/rfc6532#section-3.1)
UTF8_NON_ASCII = '[^[:ascii:]]'
# https://datatracker.ietf.org/doc/html/rfc5321#section-4.1.2
A_TEXT = "([\\w!#$%&'*+\\-/=?\\^`{|}~]|#{UTF8_NON_ASCII})" # atext = ALPHA / DIGIT / ; Printable US-ASCII
# "!" / "#" / ; characters not including
# "$" / "%" / ; specials. Used for atoms.
# "&" / "'" /
# "*" / "+" /
# "-" / "/" /
# "=" / "?" /
# "^" / "_" /
# "`" / "{" /
# "|" / "}" /
# "~"
Q_TEXT_SMTP = "([\\x20-\\x21\\x23-\\x5B\\x5D-\\x7E]|#{UTF8_NON_ASCII})" # qtextSMTP = %d32-33 / %d35-91 / %d93-126
# ; i.e., within a quoted string, any
# ; ASCII graphic or space is permitted
# ; without blackslash-quoting except
# ; double-quote and the backslash itself.
QUOTED_PAIR_SMTP = '\x5C[\x20-\x7E]' # quoted-pairSMTP = %d92 %d32-126
# ; i.e., backslash followed by any ASCII
# ; graphic (including itself) or SPace
Q_CONTENT_SMTP = "#{Q_TEXT_SMTP}|#{QUOTED_PAIR_SMTP}" # QcontentSMTP = qtextSMTP / quoted-pairSMTP
QUOTED_STRING = "\"(#{Q_CONTENT_SMTP})*\"" # Quoted-string = DQUOTE *QcontentSMTP DQUOTE
ATOM = "#{A_TEXT}+" # Atom = 1*atext
DOT_STRING = "#{ATOM}(\\.#{ATOM})*" # Dot-string = Atom *("." Atom)
LOCAL_PART = "#{DOT_STRING}|#{QUOTED_STRING}" # Local-part = Dot-string / Quoted-string
# ; MAY be case-sensitive
# IPv4-address-literal = Snum 3("." Snum)
# using `valid_id?` to check ip addresses because it's complicated. # IPv6-address-literal = "IPv6:" IPv6-addr
ADDRESS_LITERAL = '\[(IPv6:(?<ipv6>[\h:]+)|(?<ipv4>[\d.]+))\]' # address-literal = "[" ( IPv4-address-literal /
# IPv6-address-literal /
# General-address-literal ) "]"
# ; See Section 4.1.3
# using `valid_hostname?` to check domain because it's complicated
MAILBOX = "(#{LOCAL_PART})@(#{ADDRESS_LITERAL}|(?<domain>.+))" # Mailbox = Local-part "@" ( Domain / address-literal )
EMAIL_REGEX = /\A#{MAILBOX}\z/
def valid_email?(data)
return false unless match = EMAIL_REGEX.match(data)
if ipv4 = match.named_captures.fetch('ipv4')
valid_ip?(ipv4, Socket::AF_INET)
elsif ipv6 = match.named_captures.fetch('ipv6')
valid_ip?(ipv6, Socket::AF_INET6)
else
valid_hostname?(match.named_captures.fetch('domain'))
end
end
end
end
end
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