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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; 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 scripts publish)
#:use-module ((system repl server) #:prefix repl:)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (rnrs io ports)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-2)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (web http)
#:use-module (web request)
#:use-module (web response)
#:use-module (web server)
#:use-module (web uri)
#:use-module (guix base32)
#:use-module (guix base64)
#:use-module (guix config)
#:use-module (guix derivations)
#:use-module (guix hash)
#:use-module (guix pki)
#:use-module (guix pk-crypto)
#:use-module (guix store)
#:use-module (guix serialization)
#:use-module (guix ui)
#:export (guix-publish))
(define (show-help)
(format #t (_ "Usage: guix publish [OPTION]...
Publish ~a over HTTP.\n") %store-directory)
(display (_ "
-p, --port=PORT listen on PORT"))
(display (_ "
-r, --repl[=PORT] spawn REPL server on PORT"))
(newline)
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define %options
(list (option '(#\h "help") #f #f
(lambda _
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda _
(show-version-and-exit "guix publish")))
(option '(#\p "port") #t #f
(lambda (opt name arg result)
(alist-cons 'port (string->number* arg) result)))
(option '(#\r "repl") #f #t
(lambda (opt name arg result)
;; If port unspecified, use default Guile REPL port.
(let ((port (and arg (string->number* arg))))
(alist-cons 'repl (or port 37146) result))))))
(define %default-options
'((port . 8080)
(repl . #f)))
(define (lazy-read-file-sexp file)
"Return a promise to read the canonical sexp from FILE."
(delay
(call-with-input-file file
(compose string->canonical-sexp
get-string-all))))
(define %private-key
(lazy-read-file-sexp %private-key-file))
(define %public-key
(lazy-read-file-sexp %public-key-file))
(define %nix-cache-info
`(("StoreDir" . ,%store-directory)
("WantMassQuery" . 0)
("Priority" . 100)))
(define (load-derivation file)
"Read the derivation from FILE."
(call-with-input-file file read-derivation))
(define (signed-string s)
"Sign the hash of the string S with the daemon's key."
(let* ((public-key (force %public-key))
(hash (bytevector->hash-data (sha256 (string->utf8 s))
#:key-type (key-type public-key))))
(signature-sexp hash (force %private-key) public-key)))
(define base64-encode-string
(compose base64-encode string->utf8))
(define (narinfo-string store-path path-info key)
"Generate a narinfo key/value string for STORE-PATH using the details in
PATH-INFO. The narinfo is signed with KEY."
(let* ((url (string-append "nar/" (basename store-path)))
(hash (bytevector->base32-string
(path-info-hash path-info)))
(size (path-info-nar-size path-info))
(references (string-join
(map basename (path-info-references path-info))
" "))
(deriver (path-info-deriver path-info))
(base-info (format #f
"StorePath: ~a
URL: ~a
Compression: none
NarHash: sha256:~a
NarSize: ~d
References: ~a~%"
store-path url hash size references))
;; Do not render a "Deriver" or "System" line if we are rendering
;; info for a derivation.
(info (if (string-null? deriver)
base-info
(let ((drv (load-derivation deriver)))
(format #f "~aSystem: ~a~%Deriver: ~a~%"
base-info (derivation-system drv)
(basename deriver)))))
(signature (base64-encode-string
(canonical-sexp->string (signed-string info)))))
(format #f "~aSignature: 1;~a;~a~%" info (gethostname) signature)))
(define (not-found request)
"Render 404 response for REQUEST."
(values (build-response #:code 404)
(string-append "Resource not found: "
(uri-path (request-uri request)))))
(define (render-nix-cache-info)
"Render server information."
(values '((content-type . (text/plain)))
(lambda (port)
(for-each (match-lambda
((key . value)
(format port "~a: ~a~%" key value)))
%nix-cache-info))))
(define (render-narinfo store request hash)
"Render metadata for the store path corresponding to HASH."
(let* ((store-path (hash-part->path store hash))
(path-info (and (not (string-null? store-path))
(query-path-info store store-path))))
(if path-info
(values '((content-type . (application/x-nix-narinfo)))
(cut display
(narinfo-string store-path path-info (force %private-key))
<>))
(not-found request))))
(define (render-nar request store-item)
"Render archive of the store path corresponding to STORE-ITEM."
(let ((store-path (string-append %store-directory "/" store-item)))
;; The ISO-8859-1 charset *must* be used otherwise HTTP clients will
;; interpret the byte stream as UTF-8 and arbitrarily change invalid byte
;; sequences.
(if (file-exists? store-path)
(values '((content-type . (application/x-nix-archive
(charset . "ISO-8859-1"))))
(lambda (port)
(write-file store-path port)))
(not-found request))))
(define extract-narinfo-hash
(let ((regexp (make-regexp "^([a-df-np-sv-z0-9]{32}).narinfo$")))
(lambda (str)
"Return the hash within the narinfo resource string STR, or false if STR
is invalid."
(and=> (regexp-exec regexp str)
(cut match:substring <> 1)))))
(define (get-request? request)
"Return #t if REQUEST uses the GET method."
(eq? (request-method request) 'GET))
(define (request-path-components request)
"Split the URI path of REQUEST into a list of component strings. For
example: \"/foo/bar\" yields '(\"foo\" \"bar\")."
(split-and-decode-uri-path (uri-path (request-uri request))))
(define (make-request-handler store)
(lambda (request body)
(format #t "~a ~a~%"
(request-method request)
(uri-path (request-uri request)))
(if (get-request? request) ; reject POST, PUT, etc.
(match (request-path-components request)
;; /nix-cache-info
(("nix-cache-info")
(render-nix-cache-info))
;; /<hash>.narinfo
(((= extract-narinfo-hash (? string? hash)))
(render-narinfo store request hash))
;; /nar/<store-item>
(("nar" store-item)
(render-nar request store-item))
(_ (not-found request)))
(not-found request))))
(define (run-publish-server port store)
(run-server (make-request-handler store)
'http
`(#:addr ,INADDR_ANY
#:port ,port)))
(define (guix-publish . args)
(with-error-handling
(let* ((opts (args-fold* args %options
(lambda (opt name arg result)
(leave (_ "~A: unrecognized option~%") name))
(lambda (arg result)
(leave (_ "~A: extraneuous argument~%") arg))
%default-options))
(port (assoc-ref opts 'port))
(repl-port (assoc-ref opts 'repl)))
(format #t (_ "publishing ~a on port ~d~%") %store-directory port)
(when repl-port
(repl:spawn-server (repl:make-tcp-server-socket #:port repl-port)))
(with-store store
(run-publish-server (assoc-ref opts 'port) store)))))
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