809 lines
34 KiB
Scheme
809 lines
34 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix build download)
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#:use-module (web uri)
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#:use-module (web http)
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#:use-module ((web client) #:hide (open-socket-for-uri))
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#:use-module (web response)
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#:use-module (guix base64)
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#:use-module (guix ftp-client)
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#:use-module (guix build utils)
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#:use-module (guix progress)
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#:use-module (rnrs io ports)
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#:use-module (rnrs bytevectors)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:autoload (ice-9 ftw) (scandir)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:export (open-socket-for-uri
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open-connection-for-uri
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http-fetch
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%x509-certificate-directory
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close-connection
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resolve-uri-reference
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maybe-expand-mirrors
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url-fetch
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byte-count->string
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uri-abbreviation
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nar-uri-abbreviation
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store-path-abbreviation))
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;;; Commentary:
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;;;
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;;; Fetch data such as tarballs over HTTP or FTP (builder-side code).
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;;;
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;;; Code:
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(define %http-receive-buffer-size
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;; Size of the HTTP receive buffer.
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65536)
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(define* (ellipsis #:optional (port (current-output-port)))
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"Make a rough guess at whether Unicode's HORIZONTAL ELLIPSIS can be written
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in PORT's encoding, and return either that or ASCII dots."
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(if (equal? (port-encoding port) "UTF-8")
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"…"
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"..."))
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(define* (store-path-abbreviation store-path #:optional (prefix-length 6))
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"If STORE-PATH is the file name of a store entry, return an abbreviation of
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STORE-PATH for display, showing PREFIX-LENGTH characters of the hash.
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Otherwise return STORE-PATH."
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(if (string-prefix? (%store-directory) store-path)
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(let ((base (basename store-path)))
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(string-append (string-take base prefix-length)
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(ellipsis)
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(string-drop base 32)))
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store-path))
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(define* (uri-abbreviation uri #:optional (max-length 42))
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"If URI's string representation is larger than MAX-LENGTH, return an
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abbreviation of URI showing the scheme, host, and basename of the file."
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(define uri-as-string
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(uri->string uri))
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(define (elide-path)
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(let* ((path (uri-path uri))
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(base (basename path))
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(prefix (string-append (symbol->string (uri-scheme uri)) "://"
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;; `file' URIs have no host part.
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(or (uri-host uri) "")
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(string-append "/" (ellipsis) "/"))))
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(if (> (+ (string-length prefix) (string-length base)) max-length)
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(string-append prefix (ellipsis)
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(string-drop base (quotient (string-length base) 2)))
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(string-append prefix base))))
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(if (> (string-length uri-as-string) max-length)
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(let ((short (elide-path)))
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(if (< (string-length short) (string-length uri-as-string))
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short
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uri-as-string))
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uri-as-string))
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(define (nar-uri-abbreviation uri)
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"Abbreviate URI, which is assumed to be the URI of a nar as served by Hydra
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and 'guix publish', something like
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\"http://example.org/nar/1ldrllwbna0aw5z8kpci4fsvbd2w8cw4-texlive-bin-2015\"."
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(let* ((uri (if (string? uri) (string->uri uri) uri))
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(path (basename (uri-path uri))))
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(if (and (> (string-length path) 33)
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(char=? (string-ref path 32) #\-))
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(string-drop path 33)
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path)))
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(define* (ftp-fetch uri file #:key timeout print-build-trace?)
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"Fetch data from URI and write it to FILE. Return FILE on success. Bail
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out if the connection could not be established in less than TIMEOUT seconds."
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(let* ((conn (match (and=> (uri-userinfo uri)
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(cut string-split <> #\:))
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(((? string? user))
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(ftp-open (uri-host uri) #:timeout timeout
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#:username user))
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(((? string? user) (? string? pass))
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(ftp-open (uri-host uri) #:timeout timeout
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#:username user
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#:password pass))
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(_ (ftp-open (uri-host uri) #:timeout timeout))))
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(size (false-if-exception (ftp-size conn (uri-path uri))))
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(in (ftp-retr conn (basename (uri-path uri))
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(dirname (uri-path uri))
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#:timeout timeout)))
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(call-with-output-file file
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(lambda (out)
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(dump-port* in out
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#:buffer-size %http-receive-buffer-size
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#:reporter
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(if print-build-trace?
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(progress-reporter/trace
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file (uri->string uri) size)
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(progress-reporter/file
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(uri-abbreviation uri) size)))))
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(ftp-close conn)
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(unless print-build-trace?
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(newline))
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file))
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;; Autoload GnuTLS so that this module can be used even when GnuTLS is
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;; not available. At compile time, this yields "possibly unbound
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;; variable" warnings, but these are OK: we know that the variables will
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;; be bound if we need them, because (guix download) adds GnuTLS as an
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;; input in that case.
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;; XXX: Use this hack instead of #:autoload to avoid compilation errors.
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;; See <http://bugs.gnu.org/12202>.
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(module-autoload! (current-module)
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'(gnutls)
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'(gnutls-version make-session connection-end/client))
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(define %tls-ports
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;; Mapping of session record ports to the underlying file port.
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(make-weak-key-hash-table))
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(define (register-tls-record-port record-port port)
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"Hold a weak reference from RECORD-PORT to PORT, where RECORD-PORT is a TLS
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session record port using PORT as its underlying communication port."
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(hashq-set! %tls-ports record-port port))
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(define %x509-certificate-directory
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;; The directory where X.509 authority PEM certificates are stored.
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(make-parameter (or (getenv "GUIX_TLS_CERTIFICATE_DIRECTORY")
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(getenv "SSL_CERT_DIR")))) ;like OpenSSL
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(define (set-certificate-credentials-x509-trust-file!* cred file format)
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"Like 'set-certificate-credentials-x509-trust-file!', but without the file
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name decoding bug described at
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<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=26948#17>."
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(let ((data (call-with-input-file file get-bytevector-all)))
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(set-certificate-credentials-x509-trust-data! cred data format)))
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(define (make-credendials-with-ca-trust-files directory)
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"Return certificate credentials with X.509 authority certificates read from
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DIRECTORY. Those authority certificates are checked when
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'peer-certificate-status' is later called."
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(let ((cred (make-certificate-credentials))
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(files (or (scandir directory
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(lambda (file)
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(string-suffix? ".pem" file)))
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'())))
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(for-each (lambda (file)
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(let ((file (string-append directory "/" file)))
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;; Protect against dangling symlinks.
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(when (file-exists? file)
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(set-certificate-credentials-x509-trust-file!*
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cred file
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x509-certificate-format/pem))))
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(or files '()))
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cred))
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(define (peer-certificate session)
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"Return the certificate of the remote peer in SESSION."
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(match (session-peer-certificate-chain session)
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((first _ ...)
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(import-x509-certificate first x509-certificate-format/der))))
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(define (assert-valid-server-certificate session server)
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"Return #t if the certificate of the remote peer for SESSION is a valid
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certificate for SERVER, where SERVER is the expected host name of peer."
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(define cert
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(peer-certificate session))
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;; First check whether the server's certificate matches SERVER.
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(unless (x509-certificate-matches-hostname? cert server)
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(throw 'tls-certificate-error 'host-mismatch cert server))
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;; Second check its validity and reachability from the set of authority
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;; certificates loaded via 'set-certificate-credentials-x509-trust-file!'.
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(match (peer-certificate-status session)
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(() ;certificate is valid
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#t)
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((statuses ...)
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(throw 'tls-certificate-error 'invalid-certificate cert server
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statuses))))
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(define (print-tls-certificate-error port key args default-printer)
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"Print the TLS certificate error represented by ARGS in an intelligible
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way."
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(match args
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(('host-mismatch cert server)
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(format port
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"X.509 server certificate for '~a' does not match: ~a~%"
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server (x509-certificate-dn cert)))
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(('invalid-certificate cert server statuses)
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(format port
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"X.509 certificate of '~a' could not be verified:~%~{ ~a~%~}"
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server
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(map certificate-status->string statuses)))))
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(set-exception-printer! 'tls-certificate-error
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print-tls-certificate-error)
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(define* (tls-wrap port server #:key (verify-certificate? #t))
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"Return PORT wrapped in a TLS connection to SERVER. SERVER must be a DNS
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host name without trailing dot."
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(define (log level str)
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(format (current-error-port)
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"gnutls: [~a|~a] ~a" (getpid) level str))
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(let ((session (make-session connection-end/client))
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(ca-certs (%x509-certificate-directory)))
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;; Some servers such as 'cloud.github.com' require the client to support
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;; the 'SERVER NAME' extension. However, 'set-session-server-name!' is
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;; not available in older GnuTLS releases. See
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;; <http://bugs.gnu.org/18526> for details.
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(if (module-defined? (resolve-interface '(gnutls))
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'set-session-server-name!)
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(set-session-server-name! session server-name-type/dns server)
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(format (current-error-port)
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"warning: TLS 'SERVER NAME' extension not supported~%"))
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(set-session-transport-fd! session (fileno port))
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(set-session-default-priority! session)
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;; The "%COMPAT" bit allows us to work around firewall issues (info
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;; "(gnutls) Priority Strings"); see <http://bugs.gnu.org/23311>.
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;; Explicitly disable SSLv3, which is insecure:
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;; <https://tools.ietf.org/html/rfc7568>.
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;;
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;; FIXME: Since we currently fail to handle TLS 1.3 (with GnuTLS 3.6.5),
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;; remove it; see <https://bugs.gnu.org/34102>.
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(set-session-priorities! session
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(string-append
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"NORMAL:%COMPAT:-VERS-SSL3.0"
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;; The "VERS-TLS1.3" priority string is not
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;; supported by GnuTLS 3.5.
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(if (string-prefix? "3.5." (gnutls-version))
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""
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":-VERS-TLS1.3")))
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(set-session-credentials! session
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(if (and verify-certificate? ca-certs)
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(make-credendials-with-ca-trust-files
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ca-certs)
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(make-certificate-credentials)))
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;; Uncomment the following lines in case of debugging emergency.
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;;(set-log-level! 10)
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;;(set-log-procedure! log)
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(catch 'gnutls-error
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(lambda ()
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(handshake session))
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(lambda (key err proc . rest)
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(cond ((eq? err error/warning-alert-received)
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;; Like Wget, do no stop upon non-fatal alerts such as
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;; 'alert-description/unrecognized-name'.
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(format (current-error-port)
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"warning: TLS warning alert received: ~a~%"
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(alert-description->string (alert-get session)))
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(handshake session))
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(else
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;; XXX: We'd use 'gnutls_error_is_fatal' but (gnutls) doesn't
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;; provide a binding for this.
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(apply throw key err proc rest)))))
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;; Verify the server's certificate if needed.
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(when verify-certificate?
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(catch 'tls-certificate-error
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(lambda ()
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(assert-valid-server-certificate session server))
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(lambda args
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(close-port port)
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(apply throw args))))
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(let ((record (session-record-port session)))
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;; Since we use `fileno' above, the file descriptor behind PORT would be
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;; closed when PORT is GC'd. If we used `port->fdes', it would instead
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;; never be closed. So we use `fileno', but keep a weak reference to
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;; PORT, so the file descriptor gets closed when RECORD is GC'd.
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(register-tls-record-port record port)
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;; Write HTTP requests line by line rather than byte by byte:
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;; <https://bugs.gnu.org/22966>. This is possible with Guile >= 2.2.
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(setvbuf record 'line)
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record)))
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(define (ensure-uri uri-or-string) ;XXX: copied from (web http)
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(cond
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((string? uri-or-string) (string->uri uri-or-string))
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((uri? uri-or-string) uri-or-string)
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(else (error "Invalid URI" uri-or-string))))
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(define* (open-socket-for-uri uri-or-string #:key timeout)
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"Return an open input/output port for a connection to URI. When TIMEOUT is
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not #f, it must be a (possibly inexact) number denoting the maximum duration
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in seconds to wait for the connection to complete; passed TIMEOUT, an
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ETIMEDOUT error is raised."
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;; Includes a fix for <http://bugs.gnu.org/15368> which affects Guile's
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;; 'open-socket-for-uri' up to 2.0.11 included, uses 'connect*' instead
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;; of 'connect', and uses AI_ADDRCONFIG.
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(define http-proxy (current-http-proxy))
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(define uri (ensure-uri (or http-proxy uri-or-string)))
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(define addresses
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(let ((port (uri-port uri)))
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(delete-duplicates
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(getaddrinfo (uri-host uri)
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(cond (port => number->string)
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(else (symbol->string (uri-scheme uri))))
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(if (number? port)
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(logior AI_ADDRCONFIG AI_NUMERICSERV)
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AI_ADDRCONFIG))
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(lambda (ai1 ai2)
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(equal? (addrinfo:addr ai1) (addrinfo:addr ai2))))))
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(let loop ((addresses addresses))
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(let* ((ai (car addresses))
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(s (with-fluids ((%default-port-encoding #f))
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;; Restrict ourselves to TCP.
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(socket (addrinfo:fam ai) SOCK_STREAM IPPROTO_IP))))
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(catch 'system-error
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(lambda ()
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(connect* s (addrinfo:addr ai) timeout)
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;; Buffer input and output on this port.
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(setvbuf s 'block)
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;; If we're using a proxy, make a note of that.
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(when http-proxy (set-http-proxy-port?! s #t))
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s)
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(lambda args
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;; Connection failed, so try one of the other addresses.
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(close s)
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(if (null? (cdr addresses))
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(apply throw args)
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(loop (cdr addresses))))))))
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(define* (open-connection-for-uri uri
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#:key
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timeout
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(verify-certificate? #t))
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"Like 'open-socket-for-uri', but also handle HTTPS connections. The
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resulting port must be closed with 'close-connection'. When
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VERIFY-CERTIFICATE? is true, verify HTTPS server certificates."
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;; Note: Guile 2.2.0's (web client) has a same-named export that's actually
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;; undefined. See Guile commit 011669af3b428e5626f7bbf66b11d57d9768c047.
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(define https?
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(eq? 'https (uri-scheme uri)))
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(let-syntax ((with-https-proxy
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(syntax-rules ()
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((_ exp)
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;; For HTTPS URIs, honor 'https_proxy', not 'http_proxy'.
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;; FIXME: Proxying is not supported for https.
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(let ((thunk (lambda () exp)))
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(if (and https?
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(module-variable
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(resolve-interface '(web client))
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'current-http-proxy))
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(parameterize ((current-http-proxy #f))
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(when (and=> (getenv "https_proxy")
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(negate string-null?))
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(format (current-error-port)
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"warning: 'https_proxy' is ignored~%"))
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(thunk))
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(thunk)))))))
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(with-https-proxy
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(let ((s (open-socket-for-uri uri #:timeout timeout)))
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;; Buffer input and output on this port.
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(setvbuf s 'block %http-receive-buffer-size)
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(if https?
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(tls-wrap s (uri-host uri)
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#:verify-certificate? verify-certificate?)
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s)))))
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(define (close-connection port)
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"Like 'close-port', but (1) idempotent, and (2) also closes the underlying
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port if PORT is a TLS session record port."
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;; FIXME: This is a partial workaround for <http://bugs.gnu.org/20145>,
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;; because 'http-fetch' & co. may return a chunked input port whose 'close'
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;; method calls 'close-port', not 'close-connection'.
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(unless (port-closed? port)
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(close-port port))
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(and=> (hashq-ref %tls-ports port)
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close-connection))
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;; XXX: This is an awful hack to make sure the (set-port-encoding! p
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;; "ISO-8859-1") call in `read-response' passes, even during bootstrap
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;; where iconv is not available.
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(module-define! (resolve-module '(web response))
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'set-port-encoding!
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(lambda (p e) #f))
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;; XXX: Work around <http://bugs.gnu.org/23421>, fixed in Guile commit
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;; 16050431f29d56f80c4a8253506fc851b8441840. Guile's date validation
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;; procedure rejects dates in which the hour is not padded with a zero but
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;; with whitespace.
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(begin
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(define-syntax string-match?
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(lambda (x)
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(syntax-case x ()
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((_ str pat) (string? (syntax->datum #'pat))
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(let ((p (syntax->datum #'pat)))
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#`(let ((s str))
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(and
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(= (string-length s) #,(string-length p))
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#,@(let lp ((i 0) (tests '()))
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(if (< i (string-length p))
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(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
|