282 lines
8.8 KiB
Scheme
282 lines
8.8 KiB
Scheme
;;; This file is part of the Scheme Untergrund Networking package.
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;;; Copyright (c) 1994 by Brian D. Carlstrom and Olin Shivers.
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;;; Copyright (c) 2002 by Mike Sperber.
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;;; For copyright information, see the file COPYING which comes with
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;;; the distribution.
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(define-record-type http-response :http-response
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(make-response code message seconds mime extras body)
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response?
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(code response-code) ;;HTTP status code
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(message response-message);;reason phrase: textual description of
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;;status-code, or #f (-> server sends
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;;default reason phrase)
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(seconds response-seconds);;time the content was created
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(mime response-mime);;string indicating the MIME type of the response
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(extras response-extras);;assoc list with extra headers to be
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;;added to the response; its elements are
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;;pairs, each of which consists of a symbol
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;;representing the field name and a string
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;;representing the field value.
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(body response-body));; message-body
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;; This is mainly for nph-... CGI scripts.
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;; This means that the body will output the entire MIME message, not
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;; just the part after the headers.
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(define-record-type http-nph-response :http-nph-response
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(make-nph-response body)
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nph-response?
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(body nph-response-body))
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(define-record-type http-input-response :http-input-response
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(make-input-response body-maker)
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input-response?
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(body-maker input-response-body-maker))
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(define-record-type http-writer-body :http-writer-body
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(make-writer-body proc)
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writer-body?
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(proc writer-body-proc))
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(define-record-type http-reader-writer-body :http-reader-writer-body
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(make-reader-writer-body proc)
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reader-writer-body?
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(proc reader-writer-body-proc))
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(define-record-type http-redirect-body :http-redirect-body
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(make-redirect-body location)
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redirect-body?
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(location redirect-body-location))
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(define (display-http-body body iport oport options)
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(cond
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((writer-body? body)
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((writer-body-proc body) oport options))
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((reader-writer-body? body)
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((reader-writer-body-proc body) iport oport options))))
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(define-finite-type status-code :http-status-code
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(number message)
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status-code?
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status-codes
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status-code-name
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status-code-index
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(number status-code-number)
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(message status-code-message)
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(
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(ok 200 "OK")
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(created 201 "Created")
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(accepted 202 "Accepted")
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(prov-info 203 "Provisional Information")
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(no-content 204 "No Content")
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(mult-choice 300 "Multiple Choices")
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(moved-perm 301 "Moved Permanently")
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(moved-temp 302 "Moved Temporarily")
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(method 303 "Method (obsolete)")
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(not-mod 304 "Not Modified")
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(bad-request 400 "Bad Request")
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(unauthorized 401 "Unauthorized")
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(payment-req 402 "Payment Required")
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(forbidden 403 "Forbidden")
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(not-found 404 "Not Found")
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(method-not-allowed 405 "Method Not Allowed")
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(none-acceptable 406 "None Acceptable")
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(proxy-auth-required 407 "Proxy Authentication Required")
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(timeout 408 "Request Timeout")
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(conflict 409 "Conflict")
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(gone 410 "Gone")
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(internal-error 500 "Internal Server Error")
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(not-implemented 501 "Not Implemented")
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(bad-gateway 502 "Bad Gateway")
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(service-unavailable 503 "Service Unavailable")
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(gateway-timeout 504 "Gateway Timeout")
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(redirect -301 "Internal redirect")))
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(define (name->status-code name)
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(if (not (symbol? name))
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(call-error name->status-code (list name))
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(let loop ((i 0))
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(cond ((= i (vector-length status-codes))
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#f)
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((eq? name
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(status-code-name (vector-ref status-codes i)))
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(vector-ref status-codes i))
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(else
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(loop (+ i 1)))))))
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(define (number->status-code number)
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(if (not (number? number))
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(call-error number->status-code (list number))
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(let loop ((i 0))
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(cond ((= i (vector-length status-codes))
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#f)
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((= number
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(status-code-number (vector-ref status-codes i)))
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(vector-ref status-codes i))
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(else
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(loop (+ i 1)))))))
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;;; (make-error-response status-code req [message . extras])
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;
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;;; As a special case, request REQ is allowed to be #f, meaning we haven't
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;;; even had a chance to parse and construct the request. This is only used
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;;; for 400 BAD-REQUEST error report.
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(define (make-error-response code req . args)
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(let* ((message (and (pair? args) (car args)))
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(extras (if (pair? args) (cdr args) '()))
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(generic-title (lambda (port)
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(title-html port
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(status-code-message code))))
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(send-message (lambda (port)
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(if message
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(format port "<BR>~%Further Information: ~A<BR>~%" message))))
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(close-html (lambda (port)
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(for-each (lambda (x) (format port "<BR>~s~%" x)) extras)
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(write-string "</BODY>\n" port)))
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(create-response
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(lambda (headers writer-proc)
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(make-response code
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#f
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(time)
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"text/html"
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headers
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(make-writer-body writer-proc)))))
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(cond
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;; This error response requires two args: message is the new URI: field,
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;; and the first EXTRA is the older Location: field.
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((or (eq? code (status-code moved-temp))
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(eq? code (status-code moved-perm)))
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(create-response
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(list (cons 'uri message)
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(cons 'location (car extras)))
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(lambda (port options)
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(title-html port "Document moved")
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(format port
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"This document has ~A moved to a <A HREF=\"~A\">new location</A>.~%"
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(if (eq? code (status-code moved-temp))
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"temporarily"
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"permanently")
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message)
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(close-html port))))
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((eq? code (status-code bad-request))
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(create-response
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'()
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(lambda (port options)
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(generic-title port)
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(write-string "<P>Client sent a query that this server could not understand.\n"
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port)
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(send-message port)
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(close-html port))))
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((eq? code (status-code method-not-allowed))
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(create-response
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'()
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(lambda (port options)
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(generic-title port)
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(write-string "<P>Method not allowed.\n" port)
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(send-message port)
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(close-html port))))
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((eq? code (status-code unauthorized))
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(create-response
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(list (cons 'WWW-Authenticate message)) ; Vas is das?
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;; Vas das is? See: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.47
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;; message should be a challenge(?)
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(lambda (port options)
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(title-html port "Authorization Required")
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(write-string "<P>Browser not authentication-capable or\n" port)
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(write-string "authentication failed.\n" port)
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(send-message port)
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(close-html port))))
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((eq? code (status-code forbidden))
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(create-response
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'()
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(lambda (port options)
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(title-html port "Request not allowed.")
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(format port
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"Your client does not have permission to perform a ~A~%"
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(request-method req))
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(format port "operation on url ~a.~%" (request-uri req))
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(send-message port)
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(close-html port))))
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((eq? code (status-code not-found))
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(create-response
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'()
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(lambda (port options)
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(title-html port "URL not found")
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(write-string
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"<P>The requested URL was not found on this server.\n"
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port)
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(send-message port)
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(close-html port))))
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((eq? code (status-code internal-error))
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(create-response
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'()
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(lambda (port options)
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(generic-title port)
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(format port "The server encountered an internal error or
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misconfiguration and was unable to complete your request.
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<P>
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Please inform the server administrator, ~A, of the circumstances leading to
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the error, and time it occured.~%"
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(or (httpd-options-server-admin options)
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"[no mail address available]"))
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(send-message port)
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(close-html port))))
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((eq? code (status-code not-implemented))
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(create-response
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'()
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(lambda (port options)
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(generic-title port)
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(format port "This server does not currently implement
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the requested method (~A).~%"
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(request-method req))
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(send-message port)
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(close-html port))))
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((eq? code (status-code bad-gateway))
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(create-response
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'()
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(lambda (port options)
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(generic-title port)
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(format port "An error occured while waiting for the
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response of a gateway.~%")
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(send-message port)
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(close-html port)))))))
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(define (title-html out message)
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(format out "<HEAD>~%<TITLE>~%~A~%</TITLE>~%</HEAD>~%~%" message)
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(format out "<BODY>~%<H1>~A</H1>~%" message))
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;; Creates a redirect response. The server will serve the new file
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;; indicated by NEW-LOCATION. NEW-LOCATION must be uri-encoded and
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;; begin with a slash. This is intended for CGI scripts. Note that
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;; the browser won't notice the redirect. Thus, it will keep the
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;; original URL. For "real" redirections, use
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;; (make-error-response (status-code moved-perm) req
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;; "new-location" "new-location").
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(define (make-redirect-response new-location)
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(make-response
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(status-code redirect)
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#f
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(time)
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""
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'()
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(make-redirect-body new-location)))
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