106 lines
3.8 KiB
Scheme
106 lines
3.8 KiB
Scheme
(unit/sig mzlib:sendmail^
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(import)
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(define-struct (no-mail-recipients struct:exn) ())
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(define sendmail-search-path
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'("/usr/lib" "/usr/sbin"))
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(define sendmail-program-file
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(if (eq? (system-type) 'unix)
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(let loop ((paths sendmail-search-path))
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(if (null? paths)
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(raise (make-exn:misc:unsupported
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"unable to find sendmail on this Unix variant"
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(current-continuation-marks)))
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(let ((p (build-path (car paths) "sendmail")))
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(if (and (file-exists? p)
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(memq 'execute (file-or-directory-permissions p)))
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p
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(loop (cdr paths))))))
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(raise (make-exn:misc:unsupported
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"sendmail only available under Unix"
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(current-continuation-marks)))))
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;; send-mail-message/port :
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;; string x string x list (string) x list (string) x list (string)
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;; [x list (string)] -> oport
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;; -- sender can be anything, though spoofing is not recommended.
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;; The recipients must all be pure email addresses. Note that
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;; everything is expected to follow RFC conventions. If any other
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;; headers are specified, they are expected to be completely
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;; formatted already. Clients are urged to use close-output-port on
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;; the port returned by this procedure as soon as the necessary text
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;; has been written, so that the sendmail process can complete.
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(define send-mail-message/port
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(lambda (sender subject to-recipients cc-recipients bcc-recipients
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. other-headers)
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(when (and (null? to-recipients) (null? cc-recipients)
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(null? bcc-recipients))
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(raise (make-no-mail-recipients
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"no mail recipients were specified"
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(current-continuation-marks))))
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(let ((return (apply process* sendmail-program-file "-i"
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(append to-recipients cc-recipients bcc-recipients))))
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(let ((reader (car return))
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(writer (cadr return))
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(pid (caddr return))
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(error-reader (cadddr return)))
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(close-input-port reader)
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(close-input-port error-reader)
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(fprintf writer "From: ~a~n" sender)
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(letrec ((write-recipient-header
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(lambda (header-string recipients)
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(let ((header-space
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(+ (string-length header-string) 2)))
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(fprintf writer "~a: " header-string)
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(let loop ((to recipients) (indent header-space))
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(if (null? to)
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(newline writer)
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(let ((first (car to)))
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(let ((len (string-length first)))
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(if (>= (+ len indent) 80)
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(begin
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(fprintf writer "~n ~a, " first)
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(loop (cdr to) (+ len header-space 2)))
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(begin
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(fprintf writer "~a, " first)
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(loop (cdr to)
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(+ len indent 2))))))))))))
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(write-recipient-header "To" to-recipients)
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(write-recipient-header "CC" cc-recipients))
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(fprintf writer "Subject: ~a~n" subject)
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(fprintf writer "X-Mailer: MzScheme: see www.cs.rice.edu/CS/PLT/~n")
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(for-each (lambda (s)
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(display s writer)
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(newline writer))
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other-headers)
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(newline writer)
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writer))))
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;; send-mail-message :
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;; string x string x list (string) x list (string) x list (string) x
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;; list (string) [x list (string)] -> ()
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;; -- sender can be anything, though spoofing is not recommended. The
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;; recipients must all be pure email addresses. The text is expected
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;; to be pre-formatted. Note that everything is expected to follow
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;; RFC conventions. If any other headers are specified, they are
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;; expected to be completely formatted already.
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(define send-mail-message
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(lambda (sender subject to-recipients cc-recipients bcc-recipients text
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. other-headers)
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(let ((writer (apply send-mail-message/port sender subject
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to-recipients cc-recipients bcc-recipients
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other-headers)))
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(for-each (lambda (s)
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(display s writer) ; We use -i, so "." is not a problem
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(newline writer))
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text)
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(close-output-port writer))))
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)
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