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domain.lisp
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domain.lisp
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(in-package :cl-user)
(defpackage quri.domain
(:use :cl)
(:import-from :quri.uri
:uri-host)
(:import-from :quri.etld
:parse-domain)
(:import-from :alexandria
:xor
:ends-with-subseq
:length=
:when-let)
(:import-from :split-sequence
:split-sequence)
(:export :ipv4-addr-p
:ipv6-addr-p
:ip-addr-p
:ip-addr=
:uri-tld
:uri-domain
:cookie-domain-p))
(in-package :quri.domain)
(defun uri-tld (uri)
(let ((host (uri-host uri)))
(when (and host
(not (ip-addr-p host)))
(let ((pos (position #\. host :from-end t)))
(if pos
(subseq host (1 pos))
host)))))
(defun uri-domain (uri)
(let ((host (uri-host uri)))
(when (and host
(not (ip-addr-p host)))
(parse-domain host))))
(defun ipv4-addr-p (host)
(declare (optimize (speed 3) (safety 2))
# sbcl (sb-ext:muffle-conditions sb-ext:compiler-note))
(check-type host string)
(flet ((read-byte-string (string start)
(declare (type fixnum start))
(when (<= (length string) start)
(return-from read-byte-string nil))
(let* ((end ( start 2))
(endp (<= (1- (length string)) end))
(end (if endp
(1- (length string))
end))
(res 0))
(declare (type fixnum end res))
(do ((i start (1 i)))
((< end i))
(declare (type fixnum i))
(unless (char<= #\0 (aref string i) #\9)
(return-from read-byte-string
(if (= i start)
nil
(values res i nil))))
(setq res
( (* res 10)
(- (char-code (aref string i)) 48))))
(cond
(endp
(values res end t))
((char= (aref string (1 end)) #\.)
(values res (1 end) nil))))))
(let ((start 0))
(dotimes (i 4 t)
(multiple-value-bind (byte pos endp)
(read-byte-string host start)
(unless (typep byte '(unsigned-byte 8))
(return nil))
(unless (xor endp (not (= i 3)))
(return nil))
(setq start (1 pos)))))))
(defun trim-brackets (host)
(if (char= (aref host 0) #\[)
(if (char= (aref host (1- (length host))) #\])
(subseq host 1 (1- (length host)))
nil)
host))
(defun ipv6-addr-p (host)
(declare (optimize (speed 3) (safety 2))
# sbcl (sb-ext:muffle-conditions sb-ext:compiler-note))
(check-type host string)
(when (= (length host) 0)
(return-from ipv6-addr-p nil))
(labels ((read-section (string start &optional read-colons)
(declare (type string string)
(type fixnum start))
(when (<= (length string) start)
(return-from read-section
(values start read-colons t)))
(when (char= (aref string start) #\:)
(cond
((<= (length string) (1 start))
(return-from read-section nil))
((char= (aref string (1 start)) #\:)
(if read-colons
(return-from read-section nil)
(return-from read-section (read-section string ( 2 start) t))))
(t (incf start))))
(let* ((end ( start 4))
(endp (<= (length string) end))
(end (if endp
(length string)
end)))
(declare (type fixnum end))
(do ((i start (1 i)))
((= end i))
(let ((ch (aref string i)))
(cond
((char= ch #\:)
(return-from read-section
(values i read-colons nil)))
((or (char<= #\0 ch #\9)
(char<= #\a ch #\f)
(char<= #\A ch #\F)))
(t (return-from read-section nil)))))
(if endp
(values end read-colons endp)
(if (char= (aref string end) #\:)
(values end read-colons endp)
nil)))))
(setq host (trim-brackets host))
(unless host
(return-from ipv6-addr-p nil))
(let ((start 0)
(read-colons-p nil))
(dotimes (i 8 t)
(multiple-value-bind (e read-colons endp)
(read-section host start read-colons-p)
(unless e
(return-from ipv6-addr-p nil))
(when endp
(when (and (not (= i 7))
(not read-colons))
(return-from ipv6-addr-p nil))
(return-from ipv6-addr-p t))
(when (and (= i 7) (not endp))
(return-from ipv6-addr-p nil))
(setq start e
read-colons-p read-colons))))))
(defun ip-addr-p (host)
(or (ipv4-addr-p host)
(ipv6-addr-p host)))
(defun ip-addr= (ip1 ip2)
(flet ((parse-ipv6 (ip)
(setq ip (trim-brackets ip))
(cond
((char= (aref ip 0) #\:)
(setq ip (concatenate 'string "0" ip)))
((char= (aref ip (1- (length ip))) #\:)
(setq ip (concatenate 'string ip "0"))))
(let* ((ip-parsed (split-sequence #\: ip))
(len (length ip-parsed)))
(loop for section in ip-parsed
if (string= section "")
append (make-list (- 9 len) :initial-element 0)
else
collect (parse-integer section :radix 16)))))
(cond
((ipv4-addr-p ip1)
(string= ip1 ip2))
((ipv6-addr-p ip1)
(and (ipv6-addr-p ip2)
(equal (parse-ipv6 ip1)
(parse-ipv6 ip2)))))))
(defun cookie-domain-p (domain cookie-domain)
(unless cookie-domain
(return-from cookie-domain-p t))
(if (ip-addr-p domain)
(ip-addr= domain cookie-domain)
(progn
;; ignore the preceding "."
(when (char= (aref cookie-domain 0) #\.)
(setq cookie-domain (subseq cookie-domain 1)))
(when-let (registered-domain (parse-domain domain))
(cond
((length= registered-domain cookie-domain)
(string= registered-domain cookie-domain))
((length= domain cookie-domain)
(string= domain cookie-domain))
(t (and (ends-with-subseq domain cookie-domain)
(char= #\.
(aref cookie-domain (- (length cookie-domain)
(length registered-domain)))))))))))