e4ee842026
Works around <https://bugs.gnu.org/34102>. Reported by Marius Bakke <mbakke@fastmail.com>. * guix/build/download.scm (tls-wrap): Add "-VERS-TLS1.3" to the priority string when (gnutls-version) is not prefixed by "3.5".
809 lines
34 KiB
Scheme
809 lines
34 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
|
||
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
|
||
;;; Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
|
||
;;;
|
||
;;; This file is part of GNU Guix.
|
||
;;;
|
||
;;; GNU Guix is free software; you can redistribute it and/or modify it
|
||
;;; under the terms of the GNU General Public License as published by
|
||
;;; the Free Software Foundation; either version 3 of the License, or (at
|
||
;;; your option) any later version.
|
||
;;;
|
||
;;; GNU Guix is distributed in the hope that it will be useful, but
|
||
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;;; GNU General Public License for more details.
|
||
;;;
|
||
;;; You should have received a copy of the GNU General Public License
|
||
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
|
||
|
||
(define-module (guix build download)
|
||
#:use-module (web uri)
|
||
#:use-module (web http)
|
||
#:use-module ((web client) #:hide (open-socket-for-uri))
|
||
#:use-module (web response)
|
||
#:use-module (guix base64)
|
||
#:use-module (guix ftp-client)
|
||
#:use-module (guix build utils)
|
||
#:use-module (guix progress)
|
||
#:use-module (rnrs io ports)
|
||
#:use-module (rnrs bytevectors)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-11)
|
||
#:use-module (srfi srfi-19)
|
||
#:use-module (srfi srfi-26)
|
||
#:autoload (ice-9 ftw) (scandir)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (ice-9 format)
|
||
#:export (open-socket-for-uri
|
||
open-connection-for-uri
|
||
http-fetch
|
||
%x509-certificate-directory
|
||
close-connection
|
||
resolve-uri-reference
|
||
maybe-expand-mirrors
|
||
url-fetch
|
||
byte-count->string
|
||
uri-abbreviation
|
||
nar-uri-abbreviation
|
||
store-path-abbreviation))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Fetch data such as tarballs over HTTP or FTP (builder-side code).
|
||
;;;
|
||
;;; Code:
|
||
|
||
(define %http-receive-buffer-size
|
||
;; Size of the HTTP receive buffer.
|
||
65536)
|
||
|
||
(define* (ellipsis #:optional (port (current-output-port)))
|
||
"Make a rough guess at whether Unicode's HORIZONTAL ELLIPSIS can be written
|
||
in PORT's encoding, and return either that or ASCII dots."
|
||
(if (equal? (port-encoding port) "UTF-8")
|
||
"…"
|
||
"..."))
|
||
|
||
(define* (store-path-abbreviation store-path #:optional (prefix-length 6))
|
||
"If STORE-PATH is the file name of a store entry, return an abbreviation of
|
||
STORE-PATH for display, showing PREFIX-LENGTH characters of the hash.
|
||
Otherwise return STORE-PATH."
|
||
(if (string-prefix? (%store-directory) store-path)
|
||
(let ((base (basename store-path)))
|
||
(string-append (string-take base prefix-length)
|
||
(ellipsis)
|
||
(string-drop base 32)))
|
||
store-path))
|
||
|
||
(define* (uri-abbreviation uri #:optional (max-length 42))
|
||
"If URI's string representation is larger than MAX-LENGTH, return an
|
||
abbreviation of URI showing the scheme, host, and basename of the file."
|
||
(define uri-as-string
|
||
(uri->string uri))
|
||
|
||
(define (elide-path)
|
||
(let* ((path (uri-path uri))
|
||
(base (basename path))
|
||
(prefix (string-append (symbol->string (uri-scheme uri)) "://"
|
||
|
||
;; `file' URIs have no host part.
|
||
(or (uri-host uri) "")
|
||
|
||
(string-append "/" (ellipsis) "/"))))
|
||
(if (> (+ (string-length prefix) (string-length base)) max-length)
|
||
(string-append prefix (ellipsis)
|
||
(string-drop base (quotient (string-length base) 2)))
|
||
(string-append prefix base))))
|
||
|
||
(if (> (string-length uri-as-string) max-length)
|
||
(let ((short (elide-path)))
|
||
(if (< (string-length short) (string-length uri-as-string))
|
||
short
|
||
uri-as-string))
|
||
uri-as-string))
|
||
|
||
(define (nar-uri-abbreviation uri)
|
||
"Abbreviate URI, which is assumed to be the URI of a nar as served by Hydra
|
||
and 'guix publish', something like
|
||
\"http://example.org/nar/1ldrllwbna0aw5z8kpci4fsvbd2w8cw4-texlive-bin-2015\"."
|
||
(let* ((uri (if (string? uri) (string->uri uri) uri))
|
||
(path (basename (uri-path uri))))
|
||
(if (and (> (string-length path) 33)
|
||
(char=? (string-ref path 32) #\-))
|
||
(string-drop path 33)
|
||
path)))
|
||
|
||
(define* (ftp-fetch uri file #:key timeout print-build-trace?)
|
||
"Fetch data from URI and write it to FILE. Return FILE on success. Bail
|
||
out if the connection could not be established in less than TIMEOUT seconds."
|
||
(let* ((conn (match (and=> (uri-userinfo uri)
|
||
(cut string-split <> #\:))
|
||
(((? string? user))
|
||
(ftp-open (uri-host uri) #:timeout timeout
|
||
#:username user))
|
||
(((? string? user) (? string? pass))
|
||
(ftp-open (uri-host uri) #:timeout timeout
|
||
#:username user
|
||
#:password pass))
|
||
(_ (ftp-open (uri-host uri) #:timeout timeout))))
|
||
(size (false-if-exception (ftp-size conn (uri-path uri))))
|
||
(in (ftp-retr conn (basename (uri-path uri))
|
||
(dirname (uri-path uri))
|
||
#:timeout timeout)))
|
||
(call-with-output-file file
|
||
(lambda (out)
|
||
(dump-port* in out
|
||
#:buffer-size %http-receive-buffer-size
|
||
#:reporter
|
||
(if print-build-trace?
|
||
(progress-reporter/trace
|
||
file (uri->string uri) size)
|
||
(progress-reporter/file
|
||
(uri-abbreviation uri) size)))))
|
||
|
||
(ftp-close conn)
|
||
(unless print-build-trace?
|
||
(newline))
|
||
file))
|
||
|
||
;; Autoload GnuTLS so that this module can be used even when GnuTLS is
|
||
;; not available. At compile time, this yields "possibly unbound
|
||
;; variable" warnings, but these are OK: we know that the variables will
|
||
;; be bound if we need them, because (guix download) adds GnuTLS as an
|
||
;; input in that case.
|
||
|
||
;; XXX: Use this hack instead of #:autoload to avoid compilation errors.
|
||
;; See <http://bugs.gnu.org/12202>.
|
||
(module-autoload! (current-module)
|
||
'(gnutls)
|
||
'(gnutls-version make-session connection-end/client))
|
||
|
||
(define %tls-ports
|
||
;; Mapping of session record ports to the underlying file port.
|
||
(make-weak-key-hash-table))
|
||
|
||
(define (register-tls-record-port record-port port)
|
||
"Hold a weak reference from RECORD-PORT to PORT, where RECORD-PORT is a TLS
|
||
session record port using PORT as its underlying communication port."
|
||
(hashq-set! %tls-ports record-port port))
|
||
|
||
(define %x509-certificate-directory
|
||
;; The directory where X.509 authority PEM certificates are stored.
|
||
(make-parameter (or (getenv "GUIX_TLS_CERTIFICATE_DIRECTORY")
|
||
(getenv "SSL_CERT_DIR")))) ;like OpenSSL
|
||
|
||
(define (set-certificate-credentials-x509-trust-file!* cred file format)
|
||
"Like 'set-certificate-credentials-x509-trust-file!', but without the file
|
||
name decoding bug described at
|
||
<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=26948#17>."
|
||
(let ((data (call-with-input-file file get-bytevector-all)))
|
||
(set-certificate-credentials-x509-trust-data! cred data format)))
|
||
|
||
(define (make-credendials-with-ca-trust-files directory)
|
||
"Return certificate credentials with X.509 authority certificates read from
|
||
DIRECTORY. Those authority certificates are checked when
|
||
'peer-certificate-status' is later called."
|
||
(let ((cred (make-certificate-credentials))
|
||
(files (or (scandir directory
|
||
(lambda (file)
|
||
(string-suffix? ".pem" file)))
|
||
'())))
|
||
(for-each (lambda (file)
|
||
(let ((file (string-append directory "/" file)))
|
||
;; Protect against dangling symlinks.
|
||
(when (file-exists? file)
|
||
(set-certificate-credentials-x509-trust-file!*
|
||
cred file
|
||
x509-certificate-format/pem))))
|
||
(or files '()))
|
||
cred))
|
||
|
||
(define (peer-certificate session)
|
||
"Return the certificate of the remote peer in SESSION."
|
||
(match (session-peer-certificate-chain session)
|
||
((first _ ...)
|
||
(import-x509-certificate first x509-certificate-format/der))))
|
||
|
||
(define (assert-valid-server-certificate session server)
|
||
"Return #t if the certificate of the remote peer for SESSION is a valid
|
||
certificate for SERVER, where SERVER is the expected host name of peer."
|
||
(define cert
|
||
(peer-certificate session))
|
||
|
||
;; First check whether the server's certificate matches SERVER.
|
||
(unless (x509-certificate-matches-hostname? cert server)
|
||
(throw 'tls-certificate-error 'host-mismatch cert server))
|
||
|
||
;; Second check its validity and reachability from the set of authority
|
||
;; certificates loaded via 'set-certificate-credentials-x509-trust-file!'.
|
||
(match (peer-certificate-status session)
|
||
(() ;certificate is valid
|
||
#t)
|
||
((statuses ...)
|
||
(throw 'tls-certificate-error 'invalid-certificate cert server
|
||
statuses))))
|
||
|
||
(define (print-tls-certificate-error port key args default-printer)
|
||
"Print the TLS certificate error represented by ARGS in an intelligible
|
||
way."
|
||
(match args
|
||
(('host-mismatch cert server)
|
||
(format port
|
||
"X.509 server certificate for '~a' does not match: ~a~%"
|
||
server (x509-certificate-dn cert)))
|
||
(('invalid-certificate cert server statuses)
|
||
(format port
|
||
"X.509 certificate of '~a' could not be verified:~%~{ ~a~%~}"
|
||
server
|
||
(map certificate-status->string statuses)))))
|
||
|
||
(set-exception-printer! 'tls-certificate-error
|
||
print-tls-certificate-error)
|
||
|
||
(define* (tls-wrap port server #:key (verify-certificate? #t))
|
||
"Return PORT wrapped in a TLS connection to SERVER. SERVER must be a DNS
|
||
host name without trailing dot."
|
||
(define (log level str)
|
||
(format (current-error-port)
|
||
"gnutls: [~a|~a] ~a" (getpid) level str))
|
||
|
||
(let ((session (make-session connection-end/client))
|
||
(ca-certs (%x509-certificate-directory)))
|
||
|
||
;; Some servers such as 'cloud.github.com' require the client to support
|
||
;; the 'SERVER NAME' extension. However, 'set-session-server-name!' is
|
||
;; not available in older GnuTLS releases. See
|
||
;; <http://bugs.gnu.org/18526> for details.
|
||
(if (module-defined? (resolve-interface '(gnutls))
|
||
'set-session-server-name!)
|
||
(set-session-server-name! session server-name-type/dns server)
|
||
(format (current-error-port)
|
||
"warning: TLS 'SERVER NAME' extension not supported~%"))
|
||
|
||
(set-session-transport-fd! session (fileno port))
|
||
(set-session-default-priority! session)
|
||
|
||
;; The "%COMPAT" bit allows us to work around firewall issues (info
|
||
;; "(gnutls) Priority Strings"); see <http://bugs.gnu.org/23311>.
|
||
;; Explicitly disable SSLv3, which is insecure:
|
||
;; <https://tools.ietf.org/html/rfc7568>.
|
||
;;
|
||
;; FIXME: Since we currently fail to handle TLS 1.3 (with GnuTLS 3.6.5),
|
||
;; remove it; see <https://bugs.gnu.org/34102>.
|
||
(set-session-priorities! session
|
||
(string-append
|
||
"NORMAL:%COMPAT:-VERS-SSL3.0"
|
||
|
||
;; The "VERS-TLS1.3" priority string is not
|
||
;; supported by GnuTLS 3.5.
|
||
(if (string-prefix? "3.5." (gnutls-version))
|
||
""
|
||
":-VERS-TLS1.3")))
|
||
|
||
(set-session-credentials! session
|
||
(if (and verify-certificate? ca-certs)
|
||
(make-credendials-with-ca-trust-files
|
||
ca-certs)
|
||
(make-certificate-credentials)))
|
||
|
||
;; Uncomment the following lines in case of debugging emergency.
|
||
;;(set-log-level! 10)
|
||
;;(set-log-procedure! log)
|
||
|
||
(catch 'gnutls-error
|
||
(lambda ()
|
||
(handshake session))
|
||
(lambda (key err proc . rest)
|
||
(cond ((eq? err error/warning-alert-received)
|
||
;; Like Wget, do no stop upon non-fatal alerts such as
|
||
;; 'alert-description/unrecognized-name'.
|
||
(format (current-error-port)
|
||
"warning: TLS warning alert received: ~a~%"
|
||
(alert-description->string (alert-get session)))
|
||
(handshake session))
|
||
(else
|
||
;; XXX: We'd use 'gnutls_error_is_fatal' but (gnutls) doesn't
|
||
;; provide a binding for this.
|
||
(apply throw key err proc rest)))))
|
||
|
||
;; Verify the server's certificate if needed.
|
||
(when verify-certificate?
|
||
(catch 'tls-certificate-error
|
||
(lambda ()
|
||
(assert-valid-server-certificate session server))
|
||
(lambda args
|
||
(close-port port)
|
||
(apply throw args))))
|
||
|
||
(let ((record (session-record-port session)))
|
||
;; Since we use `fileno' above, the file descriptor behind PORT would be
|
||
;; closed when PORT is GC'd. If we used `port->fdes', it would instead
|
||
;; never be closed. So we use `fileno', but keep a weak reference to
|
||
;; PORT, so the file descriptor gets closed when RECORD is GC'd.
|
||
(register-tls-record-port record port)
|
||
|
||
;; Write HTTP requests line by line rather than byte by byte:
|
||
;; <https://bugs.gnu.org/22966>. This is possible with Guile >= 2.2.
|
||
(setvbuf record 'line)
|
||
|
||
record)))
|
||
|
||
(define (ensure-uri uri-or-string) ;XXX: copied from (web http)
|
||
(cond
|
||
((string? uri-or-string) (string->uri uri-or-string))
|
||
((uri? uri-or-string) uri-or-string)
|
||
(else (error "Invalid URI" uri-or-string))))
|
||
|
||
(define* (open-socket-for-uri uri-or-string #:key timeout)
|
||
"Return an open input/output port for a connection to URI. When TIMEOUT is
|
||
not #f, it must be a (possibly inexact) number denoting the maximum duration
|
||
in seconds to wait for the connection to complete; passed TIMEOUT, an
|
||
ETIMEDOUT error is raised."
|
||
;; Includes a fix for <http://bugs.gnu.org/15368> which affects Guile's
|
||
;; 'open-socket-for-uri' up to 2.0.11 included, uses 'connect*' instead
|
||
;; of 'connect', and uses AI_ADDRCONFIG.
|
||
|
||
(define http-proxy (current-http-proxy))
|
||
(define uri (ensure-uri (or http-proxy uri-or-string)))
|
||
(define addresses
|
||
(let ((port (uri-port uri)))
|
||
(delete-duplicates
|
||
(getaddrinfo (uri-host uri)
|
||
(cond (port => number->string)
|
||
(else (symbol->string (uri-scheme uri))))
|
||
(if (number? port)
|
||
(logior AI_ADDRCONFIG AI_NUMERICSERV)
|
||
AI_ADDRCONFIG))
|
||
(lambda (ai1 ai2)
|
||
(equal? (addrinfo:addr ai1) (addrinfo:addr ai2))))))
|
||
|
||
(let loop ((addresses addresses))
|
||
(let* ((ai (car addresses))
|
||
(s (with-fluids ((%default-port-encoding #f))
|
||
;; Restrict ourselves to TCP.
|
||
(socket (addrinfo:fam ai) SOCK_STREAM IPPROTO_IP))))
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(connect* s (addrinfo:addr ai) timeout)
|
||
|
||
;; Buffer input and output on this port.
|
||
(setvbuf s 'block)
|
||
;; If we're using a proxy, make a note of that.
|
||
(when http-proxy (set-http-proxy-port?! s #t))
|
||
s)
|
||
(lambda args
|
||
;; Connection failed, so try one of the other addresses.
|
||
(close s)
|
||
(if (null? (cdr addresses))
|
||
(apply throw args)
|
||
(loop (cdr addresses))))))))
|
||
|
||
(define* (open-connection-for-uri uri
|
||
#:key
|
||
timeout
|
||
(verify-certificate? #t))
|
||
"Like 'open-socket-for-uri', but also handle HTTPS connections. The
|
||
resulting port must be closed with 'close-connection'. When
|
||
VERIFY-CERTIFICATE? is true, verify HTTPS server certificates."
|
||
;; Note: Guile 2.2.0's (web client) has a same-named export that's actually
|
||
;; undefined. See Guile commit 011669af3b428e5626f7bbf66b11d57d9768c047.
|
||
|
||
(define https?
|
||
(eq? 'https (uri-scheme uri)))
|
||
|
||
(let-syntax ((with-https-proxy
|
||
(syntax-rules ()
|
||
((_ exp)
|
||
;; For HTTPS URIs, honor 'https_proxy', not 'http_proxy'.
|
||
;; FIXME: Proxying is not supported for https.
|
||
(let ((thunk (lambda () exp)))
|
||
(if (and https?
|
||
(module-variable
|
||
(resolve-interface '(web client))
|
||
'current-http-proxy))
|
||
(parameterize ((current-http-proxy #f))
|
||
(when (and=> (getenv "https_proxy")
|
||
(negate string-null?))
|
||
(format (current-error-port)
|
||
"warning: 'https_proxy' is ignored~%"))
|
||
(thunk))
|
||
(thunk)))))))
|
||
(with-https-proxy
|
||
(let ((s (open-socket-for-uri uri #:timeout timeout)))
|
||
;; Buffer input and output on this port.
|
||
(setvbuf s 'block %http-receive-buffer-size)
|
||
|
||
(if https?
|
||
(tls-wrap s (uri-host uri)
|
||
#:verify-certificate? verify-certificate?)
|
||
s)))))
|
||
|
||
(define (close-connection port)
|
||
"Like 'close-port', but (1) idempotent, and (2) also closes the underlying
|
||
port if PORT is a TLS session record port."
|
||
;; FIXME: This is a partial workaround for <http://bugs.gnu.org/20145>,
|
||
;; because 'http-fetch' & co. may return a chunked input port whose 'close'
|
||
;; method calls 'close-port', not 'close-connection'.
|
||
(unless (port-closed? port)
|
||
(close-port port))
|
||
(and=> (hashq-ref %tls-ports port)
|
||
close-connection))
|
||
|
||
;; XXX: This is an awful hack to make sure the (set-port-encoding! p
|
||
;; "ISO-8859-1") call in `read-response' passes, even during bootstrap
|
||
;; where iconv is not available.
|
||
(module-define! (resolve-module '(web response))
|
||
'set-port-encoding!
|
||
(lambda (p e) #f))
|
||
|
||
;; XXX: Work around <http://bugs.gnu.org/23421>, fixed in Guile commit
|
||
;; 16050431f29d56f80c4a8253506fc851b8441840. Guile's date validation
|
||
;; procedure rejects dates in which the hour is not padded with a zero but
|
||
;; with whitespace.
|
||
(begin
|
||
(define-syntax string-match?
|
||
(lambda (x)
|
||
(syntax-case x ()
|
||
((_ str pat) (string? (syntax->datum #'pat))
|
||
(let ((p (syntax->datum #'pat)))
|
||
#`(let ((s str))
|
||
(and
|
||
(= (string-length s) #,(string-length p))
|
||
#,@(let lp ((i 0) (tests '()))
|
||
(if (< i (string-length p))
|
||
(let ((c (string-ref p i)))
|
||
(lp (1+ i)
|
||
(case c
|
||
((#\.) ; Whatever.
|
||
tests)
|
||
((#\d) ; Digit.
|
||
(cons #`(char-numeric? (string-ref s #,i))
|
||
tests))
|
||
((#\a) ; Alphabetic.
|
||
(cons #`(char-alphabetic? (string-ref s #,i))
|
||
tests))
|
||
(else ; Literal.
|
||
(cons #`(eqv? (string-ref s #,i) #,c)
|
||
tests)))))
|
||
tests)))))))))
|
||
|
||
(define (parse-rfc-822-date str space zone-offset)
|
||
(let ((parse-non-negative-integer (@@ (web http) parse-non-negative-integer))
|
||
(parse-month (@@ (web http) parse-month))
|
||
(bad-header (@@ (web http) bad-header)))
|
||
;; We could verify the day of the week but we don't.
|
||
(cond ((string-match? (substring str 0 space) "aaa, dd aaa dddd dd:dd:dd")
|
||
(let ((date (parse-non-negative-integer str 5 7))
|
||
(month (parse-month str 8 11))
|
||
(year (parse-non-negative-integer str 12 16))
|
||
(hour (parse-non-negative-integer str 17 19))
|
||
(minute (parse-non-negative-integer str 20 22))
|
||
(second (parse-non-negative-integer str 23 25)))
|
||
(make-date 0 second minute hour date month year zone-offset)))
|
||
((string-match? (substring str 0 space) "aaa, d aaa dddd dd:dd:dd")
|
||
(let ((date (parse-non-negative-integer str 5 6))
|
||
(month (parse-month str 7 10))
|
||
(year (parse-non-negative-integer str 11 15))
|
||
(hour (parse-non-negative-integer str 16 18))
|
||
(minute (parse-non-negative-integer str 19 21))
|
||
(second (parse-non-negative-integer str 22 24)))
|
||
(make-date 0 second minute hour date month year zone-offset)))
|
||
|
||
;; The next two clauses match dates that have a space instead of
|
||
;; a leading zero for hours, like " 8:49:37".
|
||
((string-match? (substring str 0 space) "aaa, dd aaa dddd d:dd:dd")
|
||
(let ((date (parse-non-negative-integer str 5 7))
|
||
(month (parse-month str 8 11))
|
||
(year (parse-non-negative-integer str 12 16))
|
||
(hour (parse-non-negative-integer str 18 19))
|
||
(minute (parse-non-negative-integer str 20 22))
|
||
(second (parse-non-negative-integer str 23 25)))
|
||
(make-date 0 second minute hour date month year zone-offset)))
|
||
((string-match? (substring str 0 space) "aaa, d aaa dddd d:dd:dd")
|
||
(let ((date (parse-non-negative-integer str 5 6))
|
||
(month (parse-month str 7 10))
|
||
(year (parse-non-negative-integer str 11 15))
|
||
(hour (parse-non-negative-integer str 17 18))
|
||
(minute (parse-non-negative-integer str 19 21))
|
||
(second (parse-non-negative-integer str 22 24)))
|
||
(make-date 0 second minute hour date month year zone-offset)))
|
||
|
||
(else
|
||
(bad-header 'date str) ; prevent tail call
|
||
#f))))
|
||
(module-set! (resolve-module '(web http))
|
||
'parse-rfc-822-date parse-rfc-822-date))
|
||
|
||
;; XXX: Work around broken proxy handling on Guile 2.2 <= 2.2.2, fixed in
|
||
;; Guile commits 7d0d9e2c25c1e872cfc7d14ab5139915f1813d56 and
|
||
;; 6ad28ae3bc6a6d9e95ab7d70510d12c97673a143. See bug report at
|
||
;; <https://lists.gnu.org/archive/html/guix-devel/2017-11/msg00070.html>.
|
||
(cond-expand
|
||
(guile-2.2
|
||
(when (<= (string->number (micro-version)) 2)
|
||
(let ()
|
||
(define put-symbol (@@ (web http) put-symbol))
|
||
(define put-non-negative-integer
|
||
(@@ (web http) put-non-negative-integer))
|
||
(define write-http-version
|
||
(@@ (web http) write-http-version))
|
||
|
||
(define (write-request-line method uri version port)
|
||
"Write the first line of an HTTP request to PORT."
|
||
(put-symbol port method)
|
||
(put-char port #\space)
|
||
(when (http-proxy-port? port)
|
||
(let ((scheme (uri-scheme uri))
|
||
(host (uri-host uri))
|
||
(host-port (uri-port uri)))
|
||
(when (and scheme host)
|
||
(put-symbol port scheme)
|
||
(put-string port "://")
|
||
(cond
|
||
((string-index host #\:) ;<---- The fix is here!
|
||
(put-char port #\[) ;<---- And here!
|
||
(put-string port host)
|
||
(put-char port #\]))
|
||
(else
|
||
(put-string port host)))
|
||
(unless ((@@ (web uri) default-port?) scheme host-port)
|
||
(put-char port #\:)
|
||
(put-non-negative-integer port host-port)))))
|
||
(let ((path (uri-path uri))
|
||
(query (uri-query uri)))
|
||
(if (string-null? path)
|
||
(put-string port "/")
|
||
(put-string port path))
|
||
(when query
|
||
(put-string port "?")
|
||
(put-string port query)))
|
||
(put-char port #\space)
|
||
(write-http-version version port)
|
||
(put-string port "\r\n"))
|
||
|
||
(module-set! (resolve-module '(web http)) 'write-request-line
|
||
write-request-line))))
|
||
(else #t))
|
||
|
||
(define (resolve-uri-reference ref base)
|
||
"Resolve the URI reference REF, interpreted relative to the BASE URI, into a
|
||
target URI, according to the algorithm specified in RFC 3986 section 5.2.2.
|
||
Return the resulting target URI."
|
||
|
||
(define (merge-paths base-path rel-path)
|
||
(let* ((base-components (string-split base-path #\/))
|
||
(base-directory-components (match base-components
|
||
((components ... last) components)
|
||
(() '())))
|
||
(base-directory (string-join base-directory-components "/")))
|
||
(string-append base-directory "/" rel-path)))
|
||
|
||
(define (remove-dot-segments path)
|
||
(let loop ((in
|
||
;; Drop leading "." and ".." components from a relative path.
|
||
;; (absolute paths will start with a "" component)
|
||
(drop-while (match-lambda
|
||
((or "." "..") #t)
|
||
(_ #f))
|
||
(string-split path #\/)))
|
||
(out '()))
|
||
(match in
|
||
(("." . rest)
|
||
(loop rest out))
|
||
((".." . rest)
|
||
(match out
|
||
((or () (""))
|
||
(error "remove-dot-segments: too many '..' components" path))
|
||
(_
|
||
(loop rest (cdr out)))))
|
||
((component . rest)
|
||
(loop rest (cons component out)))
|
||
(()
|
||
(string-join (reverse out) "/")))))
|
||
|
||
(cond ((or (uri-scheme ref)
|
||
(uri-host ref))
|
||
(build-uri (or (uri-scheme ref)
|
||
(uri-scheme base))
|
||
#:userinfo (uri-userinfo ref)
|
||
#:host (uri-host ref)
|
||
#:port (uri-port ref)
|
||
#:path (remove-dot-segments (uri-path ref))
|
||
#:query (uri-query ref)
|
||
#:fragment (uri-fragment ref)))
|
||
((string-null? (uri-path ref))
|
||
(build-uri (uri-scheme base)
|
||
#:userinfo (uri-userinfo base)
|
||
#:host (uri-host base)
|
||
#:port (uri-port base)
|
||
#:path (remove-dot-segments (uri-path base))
|
||
#:query (or (uri-query ref)
|
||
(uri-query base))
|
||
#:fragment (uri-fragment ref)))
|
||
(else
|
||
(build-uri (uri-scheme base)
|
||
#:userinfo (uri-userinfo base)
|
||
#:host (uri-host base)
|
||
#:port (uri-port base)
|
||
#:path (remove-dot-segments
|
||
(if (string-prefix? "/" (uri-path ref))
|
||
(uri-path ref)
|
||
(merge-paths (uri-path base)
|
||
(uri-path ref))))
|
||
#:query (uri-query ref)
|
||
#:fragment (uri-fragment ref)))))
|
||
|
||
(define* (http-fetch uri #:key timeout (verify-certificate? #t))
|
||
"Return an input port containing the data at URI, and the expected number of
|
||
bytes available or #f. When TIMEOUT is true, bail out if the connection could
|
||
not be established in less than TIMEOUT seconds. When VERIFY-CERTIFICATE? is
|
||
true, verify HTTPS certificates; otherwise simply ignore them."
|
||
|
||
(define headers
|
||
`(;; Some web sites, such as http://dist.schmorp.de, would block you if
|
||
;; there's no 'User-Agent' header, presumably on the assumption that
|
||
;; you're a spammer. So work around that.
|
||
(User-Agent . "GNU Guile")
|
||
|
||
;; Some servers, such as https://alioth.debian.org, return "406 Not
|
||
;; Acceptable" when not explicitly told that everything is accepted.
|
||
(Accept . "*/*")
|
||
|
||
;; Basic authentication, if needed.
|
||
,@(match (uri-userinfo uri)
|
||
((? string? str)
|
||
`((Authorization . ,(string-append "Basic "
|
||
(base64-encode
|
||
(string->utf8 str))))))
|
||
(_ '()))))
|
||
|
||
(let*-values (((connection)
|
||
(open-connection-for-uri uri
|
||
#:timeout timeout
|
||
#:verify-certificate?
|
||
verify-certificate?))
|
||
((resp port)
|
||
(http-get uri #:port connection #:decode-body? #f
|
||
#:streaming? #t
|
||
#:headers headers))
|
||
((code)
|
||
(response-code resp)))
|
||
(case code
|
||
((200) ; OK
|
||
(values port (response-content-length resp)))
|
||
((301 ; moved permanently
|
||
302 ; found (redirection)
|
||
303 ; see other
|
||
307 ; temporary redirection
|
||
308) ; permanent redirection
|
||
(let ((uri (resolve-uri-reference (response-location resp) uri)))
|
||
(format #t "following redirection to `~a'...~%"
|
||
(uri->string uri))
|
||
(close connection)
|
||
(http-fetch uri
|
||
#:timeout timeout
|
||
#:verify-certificate? verify-certificate?)))
|
||
(else
|
||
(error "download failed" (uri->string uri)
|
||
code (response-reason-phrase resp))))))
|
||
|
||
|
||
(define-syntax-rule (false-if-exception* body ...)
|
||
"Like `false-if-exception', but print the exception on the error port."
|
||
(catch #t
|
||
(lambda ()
|
||
body ...)
|
||
(lambda (key . args)
|
||
#f)
|
||
(lambda (key . args)
|
||
(print-exception (current-error-port) #f key args))))
|
||
|
||
(define (uri-vicinity dir file)
|
||
"Concatenate DIR, slash, and FILE, keeping only one slash in between.
|
||
This is required by some HTTP servers."
|
||
(string-append (string-trim-right dir #\/) "/"
|
||
(string-trim file #\/)))
|
||
|
||
(define (maybe-expand-mirrors uri mirrors)
|
||
"If URI uses the 'mirror' scheme, expand it according to the MIRRORS alist.
|
||
Return a list of URIs."
|
||
(case (uri-scheme uri)
|
||
((mirror)
|
||
(let ((kind (string->symbol (uri-host uri)))
|
||
(path (uri-path uri)))
|
||
(match (assoc-ref mirrors kind)
|
||
((mirrors ..1)
|
||
(map (compose string->uri (cut uri-vicinity <> path))
|
||
mirrors))
|
||
(_
|
||
(error "unsupported URL mirror kind" kind uri)))))
|
||
(else
|
||
(list uri))))
|
||
|
||
(define* (url-fetch url file
|
||
#:key
|
||
(timeout 10) (verify-certificate? #t)
|
||
(mirrors '()) (content-addressed-mirrors '())
|
||
(hashes '())
|
||
print-build-trace?)
|
||
"Fetch FILE from URL; URL may be either a single string, or a list of
|
||
string denoting alternate URLs for FILE. Return #f on failure, and FILE
|
||
on success.
|
||
|
||
When MIRRORS is defined, it must be an alist of mirrors; it is used to resolve
|
||
'mirror://' URIs.
|
||
|
||
HASHES must be a list of algorithm/hash pairs, where each algorithm is a
|
||
symbol such as 'sha256 and each hash is a bytevector.
|
||
CONTENT-ADDRESSED-MIRRORS must be a list of procedures that, given a hash
|
||
algorithm and a hash, return a URL where the specified data can be retrieved
|
||
or #f.
|
||
|
||
When VERIFY-CERTIFICATE? is true, validate HTTPS server certificates;
|
||
otherwise simply ignore them."
|
||
(define uri
|
||
(append-map (cut maybe-expand-mirrors <> mirrors)
|
||
(match url
|
||
((_ ...) (map string->uri url))
|
||
(_ (list (string->uri url))))))
|
||
|
||
(define (fetch uri file)
|
||
(format #t "~%Starting download of ~a~%From ~a...~%"
|
||
file (uri->string uri))
|
||
(case (uri-scheme uri)
|
||
((http https)
|
||
(false-if-exception*
|
||
(let-values (((port size)
|
||
(http-fetch uri
|
||
#:verify-certificate? verify-certificate?
|
||
#:timeout timeout)))
|
||
(call-with-output-file file
|
||
(lambda (output)
|
||
(dump-port* port output
|
||
#:buffer-size %http-receive-buffer-size
|
||
#:reporter (if print-build-trace?
|
||
(progress-reporter/trace
|
||
file (uri->string uri) size)
|
||
(progress-reporter/file
|
||
(uri-abbreviation uri) size)))
|
||
(newline)))
|
||
file)))
|
||
((ftp)
|
||
(false-if-exception* (ftp-fetch uri file
|
||
#:timeout timeout
|
||
#:print-build-trace?
|
||
print-build-trace?)))
|
||
(else
|
||
(format #t "skipping URI with unsupported scheme: ~s~%"
|
||
uri)
|
||
#f)))
|
||
|
||
(define content-addressed-uris
|
||
(append-map (lambda (make-url)
|
||
(filter-map (match-lambda
|
||
((hash-algo . hash)
|
||
(let ((file (strip-store-file-name file)))
|
||
(string->uri (make-url file hash-algo hash)))))
|
||
hashes))
|
||
content-addressed-mirrors))
|
||
|
||
;; Make this unbuffered so 'progress-report/file' works as expected. 'line
|
||
;; means '\n', not '\r', so it's not appropriate here.
|
||
(setvbuf (current-output-port) 'none)
|
||
|
||
(setvbuf (current-error-port) 'line)
|
||
|
||
(let try ((uri (append uri content-addressed-uris)))
|
||
(match uri
|
||
((uri tail ...)
|
||
(or (fetch uri file)
|
||
(try tail)))
|
||
(()
|
||
(format (current-error-port) "failed to download ~s from ~s~%"
|
||
file url)
|
||
#f))))
|
||
|
||
;;; download.scm ends here
|