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identifiers.lisp
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identifiers.lisp
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(in-package #:clavatar)
;; This is just quick and dirty, to avoid depending on one of the numerous SMTP
;; libraries. If you actually have a dependence on an SMTP library, you should
;; define appropriate CANONICAL-IDENTIFIER and IDENTIFIER-DOMAIN methods for
;; that library's e-mail object instead.
(defstruct (%e-mail (:constructor make-%e-mail (local-part domain)))
local-part domain)
(defun make-e-mail (string)
(let ((pos (position #\@ string :from-end t :test #'char=)))
(make-%e-mail (subseq string 0 pos) (subseq string (1+ pos)))))
(defun ensure-identifier (identifier)
(typecase identifier
(string
(let ((identifier (string-trim #(#\Space #\Tab) identifier)))
(cond
((string-equal "http" (subseq identifier 0 4))
(let ((uri (puri:uri identifier)))
(setf (puri:uri-host uri) (string-downcase (puri:uri-host uri)))
uri))
((find #\@ identifier :from-end t :test #'char=)
(make-e-mail (string-downcase identifier))))))
(t identifier)))
(defun identifier-hash (identifier hash)
(ironclad:byte-array-to-hex-string
(ironclad:digest-sequence
hash
(babel:string-to-octets (canonical-identifier identifier) :encoding :utf-8))))
(defgeneric canonical-identifier (identifier))
(defmethod canonical-identifier ((identifier string))
(canonical-identifier (ensure-identifier identifier)))
(defmethod canonical-identifier ((uri puri:uri))
(setf (puri:uri-host uri) (string-downcase (puri:uri-host uri)))
(puri:render-uri uri nil))
(defmethod canonical-identifier ((e-mail %e-mail))
(string-downcase
(concatenate 'string (%e-mail-local-part e-mail) "@" (%e-mail-domain e-mail))))
(defgeneric identifier-domain (identifier))
(defmethod identifier-domain ((identifier string))
(identifier-domain (ensure-identifier identifier)))
(defmethod identifier-domain ((identifier puri:uri))
(puri:uri-host identifier))
(defmethod identifier-domain ((identifier %e-mail))
(%e-mail-domain identifier))