96 lines
3.0 KiB
Racket
96 lines
3.0 KiB
Racket
#lang racket/base
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(require racket/match racket/function racket/port racket/string
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net/url net/url-structs net/url-string)
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(provide (struct-out gmi-rsp)
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(struct-out gmi-rsp:success)
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gemini-request-read
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gemini-parse-success-meta
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gemini-response-read
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gemini-request-write
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gemini-response-write
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gemini-make-success-meta)
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;; protocol
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(define gmi-codes
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(hash 'input 10
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'sensitive-input 11
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'success 20
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'redirect-temp 30
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'redirect-perm 31
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'failure-temp 40
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'server-unavailable 41
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'cgi-error 42
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'proxy-error 43
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'slow-down 44
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'failure-perm 50
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'not-found 51
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'gone 52
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'proxy-fail 53
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'bad-request 59
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'cert-required 60
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'cert-not-authorized 61
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'cert-not-valid 62))
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(define gmi-rev-codes
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(for/hash ([(k v) (in-hash gmi-codes)])
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(values v k)))
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;; Int Str
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(struct gmi-rsp [status meta-line] #:transparent)
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;; Str Hash Port
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(struct gmi-rsp:success gmi-rsp [mime extra-fields body] #:transparent)
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;; port -> url
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;; reads a gemini request (returns the URL)
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(define (gemini-request-read [port (current-input-port)])
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(let ([line (read-line port 'any)])
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(string->url port)))
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;; util: parse success meta text
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;; str -> mimetype fields-hash
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(define (gemini-parse-success-meta meta)
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(match (regexp-split #px"; *" meta)
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[(list meta rst ...)
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(values meta (for/hash ([item (in-list rst)])
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(match (regexp-match-positions "=" item)
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[(list (cons pos _)) (values (substring item 0 pos) (substring item (add1 pos)))]
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[_ (values item #t)])))]
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['() (raise (exn:fail:network "gmi protocol error" (current-continuation-marks)))]))
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;; port -> gmi-rsp
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(define (gemini-response-read [port (current-input-port)])
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(let ([line (read-line port 'any)])
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(match (regexp-match #px"^([0-9]{2}) (.*?)$" line)
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[(list _ status-str meta)
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(let ([status (string->number status-str)])
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(match status
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[(? (curry = (hash-ref gmi-codes 'success)))
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(let-values ([(mime extra-fields) (gemini-parse-success-meta meta)])
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(gmi-rsp:success status meta mime extra-fields port))]
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[_
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(close-input-port port)
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(gmi-rsp status meta)]))]
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[_ (raise (exn:fail:network "gmi protocol error" (current-continuation-marks)))])))
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;; url port ->
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(define (gemini-request-write req-url [port (current-output-port)])
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(write-string (format "~a\r\n" (url->string req-url)) port))
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;; gmi-rsp port ->
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(define (gemini-response-write resp [port (current-output-port)])
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(write-string (format "~a ~a\r\n" (gmi-rsp-status resp) (gmi-rsp-meta-line resp)) port))
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;; string hash -> string
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(define (gemini-make-success-meta mime extra-fields)
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(string-join (cons mime (for/list ([(k v) (in-hash extra-fields)])
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(match v
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[#t k]
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[_ (string-append k "=" v)])))
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"; "))
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(module+ test
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(require rackunit))
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