27 lines
904 B
Scheme
27 lines
904 B
Scheme
#lang scheme/base
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(require mzlib/contract
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mzlib/plt-match
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net/base64
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web-server/http/request-structs)
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(define (extract-user-pass headers)
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(match (headers-assq* #"Authorization" headers)
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[#f #f]
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[(struct header (_ basic-credentials))
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(cond
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[(and (basic? basic-credentials)
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(regexp-match #rx"([^:]*):(.*)"
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(base64-decode (subbytes basic-credentials 6 (bytes-length basic-credentials)))))
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=> (lambda (user-pass)
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(cons (cadr user-pass) (caddr user-pass)))]
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[else #f])]))
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;; basic?: bytes -> (or/c (listof bytes) #f)
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;; does the second part of the authorization header start with #"Basic "
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(define basic?
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(let ([rx (byte-regexp #"^Basic .*")])
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(lambda (a) (regexp-match rx a))))
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(provide/contract
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[extract-user-pass ((listof header?) . -> . (or/c false/c (cons/c bytes? bytes?)))])
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