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http-client.rkt
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#lang racket/base
(require file/gunzip
openssl
racket/contract/base
racket/list
racket/match
racket/port
racket/string
(rename-in racket/tcp
[tcp-connect plain-tcp-connect]
[tcp-abandon-port plain-tcp-abandon-port])
"platform-ssl.rkt")
(define tolerant? #t)
(define eol-type
(if tolerant?
'any
'return-linefeed))
;; Lib
(define (->string bs)
(if (bytes? bs)
(bytes->string/utf-8 bs)
bs))
(define (->bytes str)
(cond
[(string? str)
(string->bytes/utf-8 str)]
[(not str)
#""]
[else
str]))
(define (read-bytes-line/not-eof ip kind)
(define bs (read-bytes-line ip kind))
(when (eof-object? bs)
(error 'http-client "Connection ended early"))
bs)
(define (regexp-member rx l)
(ormap (λ (h) (regexp-match rx h)) l))
(define PIPE-SIZE 4096)
;; Core
(struct http-conn (host port port-usual? to from abandon-p
auto-reconnect? auto-reconnect-host auto-reconnect-ssl?) #:mutable)
(define (make-http-conn)
(http-conn #f #f #f #f #f #f #f #f #f))
(define (http-conn-live? hc)
(define to (http-conn-to hc))
(define from (http-conn-from hc))
(and to (not (port-closed? to))
from (not (port-closed? from))
#t))
(define (http-conn-liveable? hc)
(or (http-conn-live? hc)
(http-conn-auto-reconnect? hc)))
(define (http-conn-open! hc host-bs #:ssl? [ssl? #f] #:port [port (if ssl? 443 80)]
#:auto-reconnect? [auto-reconnect? #f])
(http-conn-close! hc)
(define host (->string host-bs))
(define ssl-version (if (boolean? ssl?) 'auto ssl?))
(define-values (from to)
(cond [(list? ssl?)
;; At this point, we have a tunneled socket to the remote
;; host/port: we do not need to address it; ignore host-bs,
;; only use port for conn-port-usual?
(match-define (list ssl-ctx?
(? input-port? t:from)
(? output-port? t:to)
abandon-p) ssl?)
(set-http-conn-abandon-p! hc abandon-p)
(set-http-conn-port-usual?! hc (or (and ssl-ctx? (= 443 port))
(and (not ssl-ctx?) (= 80 port))))
(values t:from t:to)]
[ssl?
(set-http-conn-port-usual?! hc (= 443 port))
(cond
[(osx-old-openssl?)
;; OpenSSL is either not available or too old; use
;; native OS X tools
(set-http-conn-abandon-p! hc osx-ssl-abandon-port)
(osx-ssl-connect host port ssl-version)]
[(or ssl-available? (not win32-ssl-available?))
(set-http-conn-abandon-p! hc ssl-abandon-port)
(ssl-connect host port ssl-version)]
[else
(set-http-conn-abandon-p! hc win32-ssl-abandon-port)
(win32-ssl-connect host port ssl-version)])]
[else
(set-http-conn-abandon-p! hc plain-tcp-abandon-port)
(set-http-conn-port-usual?! hc (= 80 port))
(plain-tcp-connect host port)]))
(set-http-conn-host! hc host)
(set-http-conn-port! hc port)
;; (define-values (log-i log-o) (make-pipe))
;; (thread (λ () (copy-port log-i to (current-error-port))))
(set-http-conn-to! hc to)
(set-http-conn-from! hc from)
(set-http-conn-auto-reconnect?! hc auto-reconnect?)
(set-http-conn-auto-reconnect-host! hc host-bs)
(set-http-conn-auto-reconnect-ssl?! hc ssl?))
(define (http-conn-close! hc)
(match-define (http-conn host port port-usual? to from abandon
auto-reconnect? auto-reconnect-host auto-reconnect-ssl?) hc)
(set-http-conn-host! hc #f)
(when to
(close-output-port to)
(set-http-conn-to! hc #f))
(when from
(close-input-port from)
(set-http-conn-from! hc #f))
;; Doesn't seem necessary because on a reconnect, the same abandon
;; will be discovered.
#;(set-http-conn-abandon-p! hc #f))
(define (http-conn-abandon! hc)
(match-define (http-conn host port port-usual? to from abandon
auto-reconnect? auto-reconnect-host auto-reconnect-ssl?) hc)
(when to
(abandon to)
(set-http-conn-to! hc #f)))
(define (http-conn-enliven! hc)
(when (and (not (http-conn-live? hc)) (http-conn-auto-reconnect? hc))
(http-conn-open! hc (http-conn-auto-reconnect-host hc)
#:ssl? (http-conn-auto-reconnect-ssl? hc)
#:port (http-conn-port hc)
#:auto-reconnect? (http-conn-auto-reconnect? hc))))
(define (write-chunk out data)
(let ([bytes (->bytes data)])
(define len (bytes-length bytes))
(unless (zero? len)
(fprintf out "~x\r\n~a\r\n" len bytes))))
(define (http-conn-send! hc url-bs
#:version [version-bs #"1.1"]
#:method [method-bss #"GET"]
#:close? [close? #f]
#:headers [headers-bs empty]
#:content-decode [decodes '(gzip deflate)]
#:data [data #f])
(http-conn-enliven! hc)
(match-define (http-conn host port port-usual? to from _
auto-reconnect? auto-reconnect-host auto-reconnect-ssl?) hc)
(fprintf to "~a ~a HTTP/~a\r\n" method-bss url-bs version-bs)
(unless (regexp-member #rx"^(?i:Host:)[\t ]*.+$" headers-bs)
(fprintf to "Host: ~a\r\n"
(if port-usual?
host
(format "~a:~a" host port))))
(unless (regexp-member #rx"^(?i:User-Agent:)[\t ]*.+$" headers-bs)
(fprintf to "User-Agent: Racket/~a (net/http-client)\r\n"
(version)))
(unless (or (empty? decodes)
(regexp-member #rx"^(?i:Accept-Encoding:)[\t ]*.+$" headers-bs))
(fprintf to "Accept-Encoding: ~a\r\n"
(string-join (map symbol->string decodes) ",")))
(define body (->bytes data))
(cond [(procedure? body)
(fprintf to "Transfer-Encoding: chunked\r\n")]
[(and body
(not (regexp-member #rx"^(?i:Content-Length:)[\t ]*.+$" headers-bs)))
(fprintf to "Content-Length: ~a\r\n" (bytes-length body))])
(when close?
(unless (regexp-member #rx"^(?i:Connection:)[\t ]*.+$" headers-bs)
(fprintf to "Connection: close\r\n")))
(for ([h (in-list headers-bs)])
(fprintf to "~a\r\n" h))
(fprintf to "\r\n")
(cond [(procedure? body)
(body (λ (data) (write-chunk to data)))
(fprintf to "0\r\n\r\n")]
[body (display body to)])
(flush-output to))
(define (http-conn-status! hc)
(read-bytes-line/not-eof (http-conn-from hc) eol-type))
(define (http-conn-headers! hc)
(define top (read-bytes-line/not-eof (http-conn-from hc) eol-type))
(if (bytes=? top #"")
empty
(cons top (http-conn-headers! hc))))
(define BUFFER-SIZE 1024)
(define (copy-bytes in out count)
(define buffer (make-bytes BUFFER-SIZE))
(let loop ([count count])
(when (positive? count)
(define r
(read-bytes-avail! buffer in 0
(if (< count BUFFER-SIZE)
count
BUFFER-SIZE)))
(unless (eof-object? r)
(write-bytes buffer out 0 r)
(loop (- count r))))))
(define (http-conn-response-port/rest! hc)
(http-conn-response-port/length! hc +inf.0 #:close? #t))
(define (http-conn-response-port/length! hc count #:close? [close? #f])
(define-values (in out) (make-pipe PIPE-SIZE))
(thread
(λ ()
(copy-bytes (http-conn-from hc) out count)
(when close?
(http-conn-close! hc))
(close-output-port out)))
in)
(define (http-conn-response-port/chunked! hc #:close? [close? #f])
(define (http-pipe-chunk ip op)
(define (done) (void))
(define crlf-bytes (make-bytes 2))
(let loop ([last-bytes #f])
(define in-v (read-line ip eol-type))
(cond
[(eof-object? in-v)
(done)]
[else
(define size-str (string-trim in-v))
(define chunk-size (string->number size-str 16))
(unless chunk-size
(error 'http-conn-response/chunked
"Could not parse ~S as hexadecimal number"
size-str))
(define use-last-bytes?
(and last-bytes (<= chunk-size (bytes-length last-bytes))))
(if (zero? chunk-size)
(done)
(let* ([bs (if use-last-bytes?
(begin
(read-bytes! last-bytes ip 0 chunk-size)
last-bytes)
(read-bytes chunk-size ip))]
[crlf (read-bytes! crlf-bytes ip 0 2)])
(write-bytes bs op 0 chunk-size)
(loop bs)))])))
(define-values (in out) (make-pipe PIPE-SIZE))
(define chunk-t
(thread
(λ ()
(http-pipe-chunk (http-conn-from hc) out))))
(thread
(λ ()
(thread-wait chunk-t)
(when close?
(http-conn-close! hc))
(close-output-port out)))
in)
;; Derived
(define (http-conn-open host-bs #:ssl? [ssl? #f] #:port [port (if ssl? 443 80)]
#:auto-reconnect? [auto-reconnect? #f])
(define hc (make-http-conn))
(http-conn-open! hc host-bs #:ssl? ssl? #:port port #:auto-reconnect? auto-reconnect?)
hc)
(define (http-conn-CONNECT-tunnel proxy-host proxy-port target-host target-port #:ssl? [ssl? #f])
(define hc (http-conn-open proxy-host #:port proxy-port #:ssl? #f))
(define connect-string (format "~a:~a" target-host target-port))
(http-conn-send! hc #:method "CONNECT" connect-string #:headers
(list (format "Host: ~a" connect-string)
"Proxy-Connection: Keep-Alive"
"Connection: Keep-Alive"))
(let ((tunnel-status (http-conn-status! hc))
(tunnel-headers (http-conn-headers! hc)))
(unless (regexp-match "^HTTP[^ ]* +2" tunnel-status)
(error 'make-ports "HTTP CONNECT failed: ~a" tunnel-status)))
;; SSL secure the ports
(match-define (http-conn _ _ _ t:to t:from _
auto-reconnect? auto-reconnect-host auto-reconnect-ssl?) hc)
(cond [(not ssl?) ; it's just a tunnel... no ssl
(define abandon-p (lambda (p) ((http-conn-abandon-p hc) p)))
(values ssl? t:from t:to abandon-p)]
[else ; ssl
(define ssl-version (if (boolean? ssl?) 'auto ssl?))
(set-http-conn-port-usual?! hc (= 443 target-port))
;; choose between win32 or non-win32 openssl here, then keep
;; code common afterwards
(define-values (p->ssl-ps ssl-abndn-p)
(if (or ssl-available? (not win32-ssl-available?))
(values ports->ssl-ports ssl-abandon-port)
(values ports->win32-ssl-ports win32-ssl-abandon-port)))
(define clt-ctx
(match ssl-version
[(? ssl-client-context? ctx) ctx]
[(? symbol? protocol) (ssl-make-client-context protocol)]))
(define-values (r:from r:to) (p->ssl-ps t:from t:to
#:mode 'connect
#:context clt-ctx
#:close-original? #t
#:hostname target-host))
;; The user of the tunnel relies on ports->ssl-ports'
;; #:close-original? to close/abandon the underlying ports
;; of the tunnel itself. Therefore the abandon-p sent back
;; to caller is the ssl-abandon of the wrapped ports.
(define abandon-p ssl-abndn-p)
(values clt-ctx r:from r:to abandon-p)]))
(define (head? method-bss)
(or (equal? method-bss #"HEAD")
(equal? method-bss "HEAD")
(equal? method-bss 'HEAD)))
;; https://datatracker.ietf.org/doc/html/rfc2616#section-10.1
;; https://datatracker.ietf.org/doc/html/rfc2616#section-10.2.5
;; https://datatracker.ietf.org/doc/html/rfc2616#section-10.3.5
(define (no-content? status)
(regexp-match? #rx#"^HTTP.... (1..|204|304) " status))
(define (http-conn-recv! hc
#:method [method-bss #"GET"]
#:content-decode [decodes '(gzip deflate)]
#:close? [iclose? #f])
(http-conn-enliven! hc)
(define status (http-conn-status! hc))
(define headers (http-conn-headers! hc))
(define close?
(or iclose?
(regexp-member #rx#"^(?i:Connection:[\t ]*close)$" headers)))
(when close?
(http-conn-abandon! hc))
(define-values (raw-response-port wait-for-close?)
(cond
[(head? method-bss)
(values (open-input-bytes #"") #f)]
[(regexp-member #rx#"^(?i:Transfer-Encoding:[\t ]*chunked)$" headers)
(values (http-conn-response-port/chunked! hc #:close? #t)
#t)]
[(ormap (λ (h)
(match (regexp-match #rx#"^(?i:Content-Length:)[\t ]*(.+)$" h)
[#f #f]
[(list _ cl-bs)
(string->number
(bytes->string/utf-8 cl-bs))]))
headers)
=>
(λ (count)
(values (http-conn-response-port/length! hc count #:close? close?)
close?))]
;; Perform this check after the previous two in case the server
;; side returns an empty-but-chunked body, an explicit content
;; length of 0, or decides to return a body despite what the
;; spec says.
[(no-content? status)
(values (open-input-bytes #"") #f)]
[else
(values (http-conn-response-port/rest! hc) #t)]))
(define decoded-response-port
(let ([decode-response
(λ (raw-response-port decode-function)
(define-values (in out) (make-pipe PIPE-SIZE))
(define decode-t
(thread
(λ ()
(decode-function raw-response-port out))))
(thread
(λ ()
(thread-wait decode-t)
(when wait-for-close?
;; Wait for an EOF from the raw port before we send an
;; output on the decoding pipe:
(copy-port raw-response-port (open-output-nowhere)))
(close-output-port out)))
in)])
(cond
[(head? method-bss) raw-response-port]
[(and (memq 'gzip decodes)
(regexp-member #rx#"^(?i:Content-Encoding:[\t ]*gzip)$" headers)
(not (eof-object? (peek-byte raw-response-port))))
(decode-response raw-response-port gunzip-through-ports)]
[(and (memq 'deflate decodes)
(regexp-member #rx#"^(?i:Content-Encoding:[\t ]*deflate)$" headers)
(not (eof-object? (peek-byte raw-response-port))))
(decode-response raw-response-port inflate)]
[else
raw-response-port])))
(values status headers decoded-response-port))
(define (http-conn-sendrecv! hc url-bs
#:version [version-bs #"1.1"]
#:method [method-bss #"GET"]
#:headers [headers-bs empty]
#:data [data #f]
#:content-decode [decodes '(gzip deflate)]
#:close? [close? #f])
(http-conn-send! hc url-bs
#:version version-bs
#:method method-bss
#:close? close?
#:headers headers-bs
#:content-decode decodes
#:data data)
(http-conn-recv! hc
#:method method-bss
#:content-decode decodes
#:close? close?))
(define (http-sendrecv host-bs url-bs
#:ssl? [ssl? #f]
#:port [port (if ssl? 443 80)]
#:version [version-bs #"1.1"]
#:method [method-bss #"GET"]
#:headers [headers-bs empty]
#:data [data #f]
#:content-decode [decodes '(gzip deflate)])
(define hc (http-conn-open host-bs #:ssl? ssl? #:port port))
(begin0 (http-conn-sendrecv! hc url-bs
#:version version-bs
#:method method-bss
#:headers headers-bs
#:data data
#:content-decode decodes
#:close? #t)
(when (head? method-bss)
(http-conn-close! hc))))
(define data-procedure/c
(-> (-> (or/c bytes? string?) void?) any))
(define base-ssl?/c
(or/c boolean? ssl-client-context? symbol?))
(define base-ssl?-tnl/c
(or/c base-ssl?/c (list/c base-ssl?/c input-port? output-port? (-> port? void?))))
(provide
data-procedure/c
base-ssl?/c
base-ssl?-tnl/c
(contract-out
[http-conn?
(-> any/c
boolean?)]
[http-conn-live?
(-> any/c
boolean?)]
[http-conn-liveable?
(-> any/c
boolean?)]
[rename
make-http-conn http-conn
(-> http-conn?)]
[http-conn-open!
(->* (http-conn? (or/c bytes? string?))
(#:ssl? base-ssl?-tnl/c
#:port (between/c 1 65535)
#:auto-reconnect? boolean?)
void?)]
[http-conn-close!
(-> http-conn? void?)]
[http-conn-abandon!
(-> http-conn? void?)]
[http-conn-enliven!
(-> http-conn-liveable? void?)]
[http-conn-send!
(->*
(http-conn-liveable? (or/c bytes? string?))
(#:version (or/c bytes? string?)
#:method (or/c bytes? string? symbol?)
#:close? boolean?
#:headers (listof (or/c bytes? string?))
#:content-decode (listof symbol?)
#:data (or/c false/c bytes? string? data-procedure/c))
void)]
;; Derived
[http-conn-open
(->* ((or/c bytes? string?))
(#:ssl? base-ssl?-tnl/c
#:port (between/c 1 65535)
#:auto-reconnect? boolean?)
http-conn?)]
[http-conn-CONNECT-tunnel
(->* ((or/c bytes? string?)
(between/c 1 65535)
(or/c bytes? string?)
(between/c 1 65535))
(#:ssl? base-ssl?/c)
(values base-ssl?/c input-port? output-port? (-> port? void?)))]
[http-conn-recv!
(->* (http-conn-liveable?)
(#:content-decode (listof symbol?)
#:method (or/c bytes? string? symbol?)
#:close? boolean?)
(values bytes? (listof bytes?) input-port?))]
[http-conn-sendrecv!
(->* (http-conn-liveable? (or/c bytes? string?))
(#:version (or/c bytes? string?)
#:method (or/c bytes? string? symbol?)
#:headers (listof (or/c bytes? string?))
#:data (or/c false/c bytes? string? data-procedure/c)
#:content-decode (listof symbol?)
#:close? boolean?)
(values bytes? (listof bytes?) input-port?))]
[http-sendrecv
(->* ((or/c bytes? string?) (or/c bytes? string?))
(#:ssl? base-ssl?-tnl/c
#:port (between/c 1 65535)
#:version (or/c bytes? string?)
#:method (or/c bytes? string? symbol?)
#:headers (listof (or/c bytes? string?))
#:data (or/c false/c bytes? string? data-procedure/c)
#:content-decode (listof symbol?))
(values bytes? (listof bytes?) input-port?))]))