36 lines
983 B
Racket
36 lines
983 B
Racket
#lang web-server/insta
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(require net/url)
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(define (start req)
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(define cookies (request-cookies req))
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(define id-cookie
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(findf (lambda (c)
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(string=? "id" (client-cookie-name c)))
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cookies))
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(define who
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(if id-cookie
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(client-cookie-value id-cookie)
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#f))
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(define new-req
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(send/suspend
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(lambda (k-url)
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`(html (head (title "Hello!"))
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(body (h1 "Hello " ,(if who who "<unknown>"))
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(form ([action ,k-url])
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(input ([name "who"]))))))))
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(define binds
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(request-bindings/raw new-req))
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(match (bindings-assq #"who" binds)
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[(? binding:form? b)
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(define new-who
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(bytes->string/utf-8 (binding:form-value b)))
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(redirect-to (url->string (request-uri req))
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see-other
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#:headers
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(list
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(cookie->header (make-cookie "id" new-who))))]
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[else
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(redirect-to
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(url->string (request-uri req))
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see-other)]))
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