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egg-download.scm
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;;;; egg download
;
; Copyright (c) 2017-2021, The CHICKEN Team
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright notice, this list of conditions and the following
; disclaimer.
; Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
; disclaimer in the documentation and/or other materials provided with the distribution.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
(define +default-tcp-connect-timeout+ 30000) ; 30 seconds
(define +default-tcp-read/write-timeout+ 30000) ; 30 seconds
(define +url-regex+ "(http://)?([^/:]+)(:([^:/]+))?(/.*)?")
(define +max-redirects+ 3)
(tcp-connect-timeout +default-tcp-connect-timeout+)
(tcp-read-timeout +default-tcp-read/write-timeout+)
(tcp-write-timeout +default-tcp-read/write-timeout+)
(define user-agent (conc "chicken-install " (chicken-version)))
(define (deconstruct-url url)
(let ((m (irregex-match +url-regex+ url)))
(values
(if m (irregex-match-substring m 2) url)
(if (and m (irregex-match-substring m 3))
(let ((port (irregex-match-substring m 4)))
(or (string->number port)
(error "not a valid port" port)))
80)
(or (and m (irregex-match-substring m 5))
"/"))))
(define (http-fetch host port locn dest proxy-host proxy-port proxy-user-pass)
(let-values (((in out _)
(http-connect host port locn proxy-host proxy-port
proxy-user-pass)))
(http-retrieve-files in out dest)))
(define (http-query host port locn proxy-host proxy-port proxy-user-pass)
(let-values (((in out len)
(http-connect host port locn proxy-host proxy-port
proxy-user-pass)))
(close-output-port out)
(http-retrieve-response in len)))
(define (http-connect host port locn proxy-host proxy-port proxy-user-pass)
(let next-req ((redirects 0)
(host host)
(port port)
(locn locn)
(req (make-HTTP-GET/1.1
locn user-agent host
port: port accept: "*/*"
proxy-host: proxy-host proxy-port: proxy-port)))
(when (= redirects +max-redirects+)
(network-failure "too many redirects" redirects))
(d "connecting to host ~s, port ~a ~a...~%" host port
(if proxy-host
(sprintf "(via ~a:~a) " proxy-host proxy-port)
""))
(let-values (((in out)
(tcp-connect (or proxy-host host) (or proxy-port port))))
(d "requesting ~s ...~%" locn)
(display req out)
(flush-output out)
(d "reading response ...~%")
(let* ((chunked #f)
(datalen #f)
(h1 (read-line in))
(response-match (match-http-response h1)))
(define (process-headers)
(let ((ln (read-line in)))
(unless (equal? ln "")
(cond ((match-chunked-transfer-encoding ln)
(set! chunked #t))
((match-content-length ln) =>
(lambda (sz) (set! datalen sz)))
((match-location ln) =>
(lambda (new-locn)
(set!-values (host port locn)
(deconstruct-url new-locn)))))
(d "~a~%" ln)
(process-headers) ) ) )
(d "~a~%" h1)
(cond
((response-match-code? response-match 407)
(close-input-port in)
(close-output-port out)
(d "retrying with proxy auth ~a~%" locn)
(next-req redirects host port locn
(make-HTTP-GET/1.1
locn user-agent host port: port
accept: "*/*"
proxy-host: proxy-host proxy-port: proxy-port
proxy-user-pass: proxy-user-pass)))
((or (response-match-code? response-match 301)
(response-match-code? response-match 302))
(process-headers)
(close-input-port in)
(close-output-port out)
(d "redirected to ~a~%" locn)
(next-req (add1 redirects) host port locn
(make-HTTP-GET/1.1
locn user-agent host
port: port accept: "*/*"
proxy-host: proxy-host proxy-port: proxy-port)))
((response-match-code? response-match 200)
(process-headers)
(when chunked
(d "reading chunks ")
(let ((data (read-chunks in)))
(close-input-port in)
(set! in (open-input-string data))) )
(values in out datalen))
(else (network-failure "invalid response from server" h1)))))))
(define (http-retrieve-files in out dest)
(d "reading files ...~%")
(let ((version #f))
(define (skip)
(let ((ln (read-line in)))
(cond ((or (eof-object? ln)
(irregex-match " *#!eof *" ln))
(open-input-string ""))
((irregex-match " *#\\|[- ]*([^- ]*) *\\|#.*" ln) =>
(lambda (m)
(let ((v (irregex-match-substring m 1)))
(cond ((or (string=? "" v) (string=? "#f" v)))
((and version (not (string=? v version)))
(warning "files versions are not identical"
ln version)
(set! version #f))
(else
(set! version v)))
(open-input-string ln))))
((irregex-match "^[ ]*\\(error .*\\)[ ]*$" ln)
(open-input-string ln)) ; get-files deals with errors
((irregex-match '(* ("\x09\x0a\x0b\x0c\x0d\x20\xa0")) ln)
(skip)) ; Blank line.
(else
(error "unrecognized file-information - possibly corrupt transmission"
ln)))))
(let get-files ((files '()))
(let* ((ins (skip))
(name (read ins)))
(cond ((and (pair? name) (eq? 'error (car name)))
(server-error (cadr name) (cddr name)))
((or (eof-object? name) (not name))
(close-input-port in)
(close-output-port out)
version)
((not (string? name))
(error "invalid file name - possibly corrupt transmission"
name) )
((string-suffix? "/" name)
(d " ~a~%" name)
(create-directory (make-pathname dest name))
(get-files files) )
(else
(d " ~a~%" name)
(let* ((size (read ins))
(data (read-string size in)) )
(with-output-to-file (make-pathname dest name)
(cut display data) #:binary ) )
(get-files (cons name files)) ) ) ) ) ))
(define (http-retrieve-response in len)
(d "reading response ...~%")
(let ((data (read-string len in)))
(close-input-port in)
data))
(define (server-error msg args)
(abort
(make-composite-condition
(make-property-condition
'exn
'message (string-append "[Server] " msg)
'arguments args)
(make-property-condition 'setup-download-error))))
(define (read-chunks in)
(let get-chunks ((data '()))
(let ((size (string->number (read-line in) 16)))
(cond ((not size)
(error "invalid response from server - please try again"))
((zero? size)
(d "~%")
(string-intersperse (reverse data) ""))
(else
(let ((chunk (read-string size in)))
(d ".")
(read-line in)
(get-chunks (cons chunk data)) ) ) ) ) ))
(define (match-http-response rsp)
(and (string? rsp)
(irregex-match "HTTP/[0-9.]+\\s+([0-9]+)\\s+.*" rsp)) )
(define (response-match-code? mrsp code)
(and mrsp (string=? (number->string code)
(irregex-match-substring mrsp 1))) )
(define (match-chunked-transfer-encoding ln)
(irregex-match "[Tt]ransfer-[Ee]ncoding:\\s*chunked.*" ln) )
(define (match-location ln)
(let ((m (irregex-match "[Ll]ocation:\\s*(.+)\\s*" ln)))
(and m (irregex-match-substring m 1))))
(define (match-content-length ln)
(let ((m (irregex-match "[Cc]ontent-[Ll]ength:\\s*([0-9]+).*" ln)))
(and m (string->number (irregex-match-substring m 1)))))
(define (make-HTTP-GET/1.1 location user-agent host
#!key
(port 80)
(connection "close")
(accept "*")
(content-length 0)
proxy-host proxy-port proxy-user-pass)
(conc
"GET "
(if proxy-host
(string-append "http://" host location)
location)
" HTTP/1.1" "\r\n"
"Connection: " connection "\r\n"
"User-Agent: " user-agent "\r\n"
"Accept: " accept "\r\n"
"Host: " host #\: port "\r\n"
(if proxy-user-pass
(string-append "Proxy-Authorization: Basic " proxy-user-pass "\r\n")
"")
"Content-length: " content-length "\r\n"
"\r\n") )
(define (network-failure msg . args)
(signal
(make-composite-condition
(make-property-condition
'exn
'message "invalid response from server"
'arguments args)
(make-property-condition 'http-fetch))) )
;; entry points
(define (list-versions egg url)
(receive (host port locn) (deconstruct-url url)
(let ((locn (conc locn
"?name=" egg
"&release=" major-version
"&mode=default"
"&listversions=1")))
(let ((data (http-query host port locn proxy-host
proxy-port proxy-user-pass)))
(string-split data)))))
(define (try-list-versions name url #!key
proxy-host proxy-port proxy-user-pass)
(d "listing versions for ~a: ~a~%" name url)
(condition-case (list-versions name url)
((exn net)
(print "TCP connect timeout")
#f)
((exn http-fetch)
(print "HTTP protocol error")
#f)
(e (exn setup-download-error)
(print "Server error:")
(print-error-message e)
#f)
(e () (abort e) )))
(define (download-egg egg url #!key version destination tests
proxy-host proxy-port proxy-user-pass)
(receive (host port locn) (deconstruct-url url)
(let* ((locn (conc locn
"?name=" egg
"&release=" major-version
(if version (string-append "&version=" version) "")
"&mode=default"
(if tests "&tests=yes" "")))
(eggdir destination))
(let ((fversion (http-fetch host port locn eggdir proxy-host
proxy-port proxy-user-pass)))
;; If we get here then version of egg exists
(values eggdir (or fversion version "")) )) ) )
(define (try-download name url #!key version destination tests
proxy-host proxy-port proxy-user-pass)
(d "downloading ~a: ~a~%" name url)
(condition-case
(download-egg
name url
version: version
destination: destination
tests: tests
proxy-host: proxy-host
proxy-port: proxy-port
proxy-user-pass: proxy-user-pass)
((exn net)
(print "TCP connect timeout")
(values #f "") )
((exn http-fetch)
(print "HTTP protocol error")
(values #f "") )
(e (exn setup-download-error)
(print "Server error:")
(print-error-message e)
(values #f ""))
(e () (abort e) )))