Initial commit

This is a service designed to provide information about Guix. At the
moment, this initial prototype gathers up information about packages,
the associated metadata and derivations.

The initial primary use case is to compare two different revisions of
Guix, detecting which packages are new, no longer present, updated or
otherwise different.

It's based on the Mumi project.

[1]: https://git.elephly.net/software/mumi.git

1 files changed, 127 insertions, 0 deletions

diff --git a/guix-data-service/web/render.scm b/guix-data-service/web/render.scm
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+;;; Guix Data Service -- Information about Guix over time
+;;; Copyright © 2016, 2017 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2014 David Thompson <davet@gnu.org>
+;;; 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/>.
+
+;; This code was snarfed from David Thompson's guix-web.
+
+(define-module (guix-data-service web render)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-19)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 binary-ports)
+  #:use-module (web request)
+  #:use-module (web response)
+  #:use-module (web uri)
+  #:use-module (json)
+  #:use-module (guix-data-service config)
+  #:use-module (guix-data-service web sxml)
+  #:use-module (guix-data-service web util)
+  #:export (render-static-asset
+            render-html
+            render-json
+            not-found
+            unprocessable-entity
+            created
+            redirect))
+
+(define file-mime-types
+  '(("css" . (text/css))
+    ("js"  . (text/javascript))
+    ("svg" . (image/svg+xml))
+    ("png" . (image/png))
+    ("gif" . (image/gif))
+    ("woff" . (application/font-woff))
+    ("ttf"  . (application/octet-stream))
+    ("html" . (text/html))))
+
+(define (render-static-asset request)
+  (render-static-file (%config 'assets-dir) request))
+
+(define %not-slash
+  (char-set-complement (char-set #\/)))
+
+(define (render-static-file root request)
+  (define path
+    (uri-path (request-uri request)))
+
+  (define failure
+    (not-found (build-uri 'http
+                          #:host (%config 'host)
+                          #:port (%config 'port)
+                          #:path path)))
+
+  (let ((file-name (string-append root "/" path)))
+    (if (not (any (cut string-contains <> "..")
+                  (string-tokenize path %not-slash)))
+        (let* ((stat (stat file-name #f))
+               (modified (and stat
+                              (make-time time-utc 0 (stat:mtime stat)))))
+          (define (send-file)
+            (list `((content-type
+                     . ,(assoc-ref file-mime-types
+                                   (file-extension file-name)))
+                    (last-modified . ,(time-utc->date modified)))
+                  (call-with-input-file file-name get-bytevector-all)))
+
+          (if (and stat (not (eq? 'directory (stat:type stat))))
+              (cond ((assoc-ref (request-headers request) 'if-modified-since)
+                     =>
+                     (lambda (client-date)
+                       (if (time>? modified (date->time-utc client-date))
+                           (send-file)
+                           (list (build-response #:code 304) ;"Not Modified"
+                                 #f))))
+                    (else
+                     (send-file)))
+              failure))
+        failure)))
+
+(define* (render-html #:key sxml (extra-headers '()))
+  (list (append extra-headers
+                '((content-type . (text/html))))
+        (lambda (port)
+          (sxml->html sxml port))))
+
+(define (render-json json)
+  (list '((content-type . (application/json)))
+        (lambda (port)
+          (scm->json json port))))
+
+(define (not-found uri)
+  (list (build-response #:code 404)
+        (string-append "Resource not found: " (uri->string uri))))
+
+(define (unprocessable-entity)
+  (list (build-response #:code 422)
+        ""))
+
+(define (created)
+  (list (build-response #:code 201)
+        ""))
+
+(define (redirect path)
+  (let ((uri (build-uri 'http
+                        #:host (%config 'host)
+                        #:port (%config 'port)
+                        #:path (string-append
+                                "/" (encode-and-join-uri-path path)))))
+    (list (build-response
+           #:code 301
+           #:headers `((content-type . (text/html))
+                       (location . ,uri)))
+          (format #f "Redirect to ~a" (uri->string uri)))))