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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program 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
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-data-service web nar controller)
#:use-module (srfi srfi-1)
#:use-module (ice-9 iconv)
#:use-module (ice-9 match)
#:use-module (ice-9 format)
#:use-module (ice-9 binary-ports)
#:use-module (rnrs bytevectors)
#:use-module (gcrypt hash)
#:use-module (gcrypt pk-crypto)
#:use-module (web uri)
#:use-module (web request)
#:use-module (web response)
#:use-module (guix pki)
#:use-module (guix base32)
#:use-module (guix base64)
#:use-module (guix serialization)
#:use-module (guix-data-service web render)
#:use-module (guix-data-service model derivation)
#:export (nar-controller
%narinfo-signing-private-key
%narinfo-signing-public-key))
(define %narinfo-signing-private-key
(make-parameter #f))
(define %narinfo-signing-public-key
(make-parameter #f))
(define (nar-controller request
method-and-path-components
mime-types
body
conn)
(define (.narinfo-suffix s)
(string-suffix? ".narinfo" s))
(match method-and-path-components
(('GET "nar" derivation)
(render-nar request
mime-types
conn
(string-append "/gnu/store/" derivation)))
(('GET (? .narinfo-suffix path))
(let* ((hash (string-drop-right
path
(string-length ".narinfo")))
(derivation (select-derivation-by-file-name-hash
conn
hash)))
(if derivation
(list (build-response
#:code 200
#:headers '((content-type . (application/x-narinfo))))
(let* ((derivation-file-name
(second derivation))
(derivation-text
(select-serialized-derivation-by-file-name
conn
derivation-file-name))
(derivation-bytevector
(string->bytevector derivation-text
"ISO-8859-1"))
(derivation-references
(select-derivation-references-by-derivation-id
conn
(first derivation)))
(nar-bytevector
(call-with-values
(lambda ()
(open-bytevector-output-port))
(lambda (port get-bytevector)
(write-file-tree
derivation-file-name
port
#:file-type+size
(lambda (file)
(values 'regular
(bytevector-length derivation-bytevector)))
#:file-port
(lambda (file)
(open-bytevector-input-port derivation-bytevector)))
(get-bytevector)))))
(lambda (port)
(display (narinfo-string derivation-file-name
nar-bytevector
derivation-references)
port))))
(not-found (request-uri request)))))
(_ #f)))
(define (render-nar request
mime-types
conn
derivation-file-name)
(let ((derivation-text
(select-serialized-derivation-by-file-name
conn
derivation-file-name)))
(if derivation-text
(let ((derivation-bytevector
(string->bytevector derivation-text
"ISO-8859-1")))
(list (build-response
#:code 200
#:headers '((content-type . (application/x-nix-archive
(charset . "ISO-8859-1")))))
(lambda (port)
(write-file-tree
derivation-file-name
port
#:file-type+size
(lambda (file)
(values 'regular
(bytevector-length derivation-bytevector)))
#:file-port
(lambda (file)
(open-bytevector-input-port derivation-bytevector))))))
(not-found (request-uri request)))))
(define* (narinfo-string store-item
nar-bytevector
references
#:key
(nar-path "nar"))
(define (signed-string s)
(let* ((public-key (%narinfo-signing-public-key))
(hash (bytevector->hash-data (sha256 (string->utf8 s))
#:key-type (key-type public-key))))
(signature-sexp hash (%narinfo-signing-private-key) public-key)))
(let* ((hash (bytevector->nix-base32-string
(sha256 nar-bytevector)))
(size (bytevector-length nar-bytevector))
(references (string-join
(map basename references)
" "))
(info (format #f
"\
StorePath: ~a
URL: ~a
Compression: none
NarHash: sha256:~a
NarSize: ~d
References: ~a~%"
store-item
(encode-and-join-uri-path
(list nar-path
(basename store-item)))
hash
size
references)))
(if (%narinfo-signing-private-key)
(format #f "~aSignature: 1;~a;~a~%"
info
(gethostname)
(base64-encode
(string->utf8
(canonical-sexp->string (signed-string info)))))
info)))
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