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;;; Guix Build Coordinator
;;;
;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
;;;
;;; This file is part of the guix-build-coordinator.
;;;
;;; The Guix Build Coordinator 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.
;;;
;;; The Guix Build Coordinator 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 the guix-data-service. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-build-coordinator agent-messaging http)
#:use-module (ice-9 match)
#:use-module (system repl error-handling)
#:use-module (fibers web server)
#:use-module (rnrs bytevectors)
#:use-module (json)
#:use-module (web http)
#:use-module (web client)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:use-module (guix base64)
#:use-module (guix-build-coordinator datastore)
#:export (http-agent-messaging-start-server
submit-status))
(define (http-agent-messaging-start-server port host secret-key-base
datastore)
(call-with-error-handling
(lambda ()
(run-server
(lambda (request body)
(format #f "~a ~a\n"
(request-method request)
(uri-path (request-uri request)))
(apply values
(controller request
(cons (request-method request)
(split-and-decode-uri-path
(uri-path (request-uri request))))
body
secret-key-base
datastore)))
#:host host
#:port port))
#:on-error 'backtrace
#:post-error (lambda (key . args)
(when (eq? key 'system-error)
(match args
(("bind" "~A" ("Address already in use") _)
(simple-format
(current-error-port)
"\n
error: guix-build-coordinator could not start, as it could not bind to port ~A
Check if it's already running, or whether another process is using that
port. Also, the port used can be changed by passing the --port option.\n"
port)))))))
(define* (render-json json #:key (extra-headers '())
(code 200))
(list (build-response
#:code code
#:headers (append extra-headers
'((content-type . (application/json))
(vary . (accept)))))
(lambda (port)
(scm->json json port))))
(define (no-content)
(list (build-response #:code 204)
""))
(define (controller request
method-and-path-components
body
secret-key-base
datastore)
(define (authenticated? uuid request)
(let* ((authorization-base64
(match (assq-ref (request-headers request)
'authorization)
(('basic . s) s)))
(authorization
(utf8->string
(base64-decode authorization-base64))))
(match (string-split authorization #\:)
((auth-uuid auth-password)
(and
(string=? auth-uuid uuid)
(datastore-agent-password-exists? datastore
uuid
auth-password)))
(_ #f))))
(define (controller-thunk)
(match method-and-path-components
(('GET "agent" uuid)
(let ((agent (datastore-find-agent datastore uuid)))
(if agent
(render-json
`((agent . ,uuid)
,@agent))
(render-json
(simple-format #f "no agent found with id: ~A"
uuid)
#:code 404))))
(('PUT "agent" uuid)
(if (authenticated? uuid request)
(no-content)
(render-json
"access denied"
#:code 403)))
(_
(render-json
"not-found"
#:code 404))))
(call-with-error-handling
controller-thunk
#:on-error 'backtrace
#:post-error (lambda args
(render-json
`((error . ,(simple-format #f "~A" args)))
#:code 500))))
(define (coordinator-uri-for-path base-uri-string agent-path)
(let* ((base-uri (string->uri base-uri-string))
(scheme (uri-scheme base-uri))
(host (uri-host base-uri))
(port (uri-port base-uri))
(path (uri-path base-uri)))
(build-uri scheme
#:host host
#:port port
#:path
(string-append
path
(if (string-suffix? path "/")
agent-path
(string-drop agent-path 1))))))
(define (submit-status coordinator-uri agent-uuid password
status)
(define auth-value
(string-append
"Basic "
(base64-encode
(string->utf8
(string-append agent-uuid ":" password)))))
(define uri
(coordinator-uri-for-path
coordinator-uri
(string-append "/agent/" agent-uuid)))
(http-request
uri
#:method 'PUT ; TODO Should be PATCH
#:body (scm->json-string
`((status . ,status)))
#:headers
`((Authorization . ,auth-value))))
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