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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
+;;;
+;;; 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 (gnu installer newt wifi)
+ #:use-module (gnu installer connman)
+ #:use-module (gnu installer steps)
+ #:use-module (gnu installer newt utils)
+ #:use-module (gnu installer newt page)
+ #:use-module (guix i18n)
+ #:use-module (guix records)
+ #:use-module (ice-9 format)
+ #:use-module (ice-9 popen)
+ #:use-module (ice-9 receive)
+ #:use-module (ice-9 regex)
+ #:use-module (ice-9 rdelim)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-34)
+ #:use-module (srfi srfi-35)
+ #:use-module (newt)
+ #:export (run-wifi-page))
+
+;; This record associates a connman service to its key the listbox.
+(define-record-type* <service-item>
+ service-item make-service-item
+ service-item?
+ (service service-item-service) ; connman <service>
+ (key service-item-key)) ; newt listbox-key
+
+(define (strength->string strength)
+ "Convert STRENGTH as an integer percentage into a text printable strength
+bar using unicode characters. Taken from NetworkManager's
+nmc_wifi_strength_bars."
+ (let ((quarter #\x2582)
+ (half #\x2584)
+ (three-quarter #\x2586)
+ (full #\x2588))
+ (cond
+ ((> strength 80)
+ ;; ▂▄▆█
+ (string quarter half three-quarter full))
+ ((> strength 55)
+ ;; ▂▄▆_
+ (string quarter half three-quarter #\_))
+ ((> strength 30)
+ ;; ▂▄__
+ (string quarter half #\_ #\_))
+ ((> strength 5)
+ ;; ▂___
+ (string quarter #\_ #\_ #\_))
+ (else
+ ;; ____
+ (string quarter #\_ #\_ #\_ #\_)))))
+
+(define (force-wifi-scan)
+ "Force a wifi scan. Raise a condition if no wifi technology is available."
+ (let* ((technologies (connman-technologies))
+ (wifi-technology
+ (find (lambda (technology)
+ (string=? (technology-type technology) "wifi"))
+ technologies)))
+ (if wifi-technology
+ (connman-scan-technology wifi-technology)
+ (raise (condition
+ (&message
+ (message (G_ "Unable to find a wifi technology"))))))))
+
+(define (draw-scanning-page)
+ "Draw a page to indicate a wifi scan in in progress."
+ (draw-info-page (G_ "Scanning wifi for available networks, please wait.")
+ (G_ "Scan in progress")))
+
+(define (run-wifi-password-page)
+ "Run a page prompting user for a password and return it."
+ (run-input-page (G_ "Please enter the wifi password")
+ (G_ "Password required")))
+
+(define (run-wrong-password-page service-name)
+ "Run a page to inform user of a wrong password input."
+ (run-error-page
+ (format #f (G_ "The password you entered for ~a is incorrect.")
+ service-name)
+ (G_ "Wrong password")))
+
+(define (run-unknown-error-page service-name)
+ "Run a page to inform user that a connection error happened."
+ (run-error-page
+ (format #f
+ (G_ "An error occured while trying to connect to ~a, please retry.")
+ service-name)
+ (G_ "Connection error")))
+
+(define (password-callback)
+ (run-wifi-password-page))
+
+(define (connect-wifi-service listbox service-items)
+ "Connect to the wifi service selected in LISTBOX. SERVICE-ITEMS is the list
+of <service-item> records present in LISTBOX."
+ (let* ((listbox-key (current-listbox-entry listbox))
+ (item (find (lambda (item)
+ (eq? (service-item-key item) listbox-key))
+ service-items))
+ (service (service-item-service item))
+ (service-name (service-name service))
+ (form (draw-connecting-page service-name)))
+ (dynamic-wind
+ (const #t)
+ (lambda ()
+ (guard (c ((connman-password-error? c)
+ (run-wrong-password-page service-name)
+ #f)
+ ((connman-already-connected-error? c)
+ #t)
+ ((connman-connection-error? c)
+ (run-unknown-error-page service-name)
+ #f))
+ (connman-connect-with-auth service password-callback)))
+ (lambda ()
+ (destroy-form-and-pop form)))))
+
+(define (run-wifi-scan-page)
+ "Force a wifi scan and draw a page during the operation."
+ (let ((form (draw-scanning-page)))
+ (force-wifi-scan)
+ (destroy-form-and-pop form)))
+
+(define (wifi-services)
+ "Return all the connman services of wifi type."
+ (let ((services (connman-services)))
+ (filter (lambda (service)
+ (and (string=? (service-type service) "wifi")
+ (not (string-null? (service-name service)))))
+ services)))
+
+(define* (fill-wifi-services listbox wifi-services)
+ "Append all the services in WIFI-SERVICES to the given LISTBOX."
+ (clear-listbox listbox)
+ (map (lambda (service)
+ (let* ((text (service->text service))
+ (key (append-entry-to-listbox listbox text)))
+ (service-item
+ (service service)
+ (key key))))
+ wifi-services))
+
+;; Maximum length of a wifi service name.
+(define service-name-max-length (make-parameter 20))
+
+;; Heigth of the listbox displaying wifi services.
+(define wifi-listbox-heigth (make-parameter 20))
+
+;; Information textbox width.
+(define info-textbox-width (make-parameter 40))
+
+(define (service->text service)
+ "Return a string composed of the name and the strength of the given
+SERVICE. A '*' preceding the service name indicates that it is connected."
+ (let* ((name (service-name service))
+ (padded-name (string-pad-right name
+ (service-name-max-length)))
+ (strength (service-strength service))
+ (strength-string (strength->string strength))
+ (state (service-state service))
+ (connected? (or (string=? state "online")
+ (string=? state "ready"))))
+ (format #f "~c ~a ~a~%"
+ (if connected? #\* #\ )
+ padded-name
+ strength-string)))
+
+(define (run-wifi-page)
+ "Run a page displaying available wifi networks in a listbox. Connect to the
+network when the corresponding listbox entry is selected. A button allow to
+force a wifi scan."
+ (let* ((listbox (make-listbox
+ -1 -1
+ (wifi-listbox-heigth)
+ (logior FLAG-SCROLL FLAG-BORDER FLAG-RETURNEXIT)))
+ (form (make-form))
+ (buttons-grid (make-grid 1 1))
+ (middle-grid (make-grid 2 1))
+ (info-text (G_ "Please select a wifi network."))
+ (info-textbox
+ (make-reflowed-textbox -1 -1 info-text
+ (info-textbox-width)
+ #:flags FLAG-BORDER))
+ (cancel-button (make-button -1 -1 (G_ "Cancel")))
+ (scan-button (make-button -1 -1 (G_ "Scan")))
+ (services (wifi-services))
+ (service-items '()))
+
+ (if (null? services)
+ (append-entry-to-listbox listbox (G_ "No wifi detected"))
+ (set! service-items (fill-wifi-services listbox services)))
+
+ (set-grid-field middle-grid 0 0 GRID-ELEMENT-COMPONENT listbox)
+ (set-grid-field middle-grid 1 0 GRID-ELEMENT-COMPONENT scan-button
+ #:anchor ANCHOR-TOP
+ #:pad-left 2)
+ (set-grid-field buttons-grid 0 0 GRID-ELEMENT-COMPONENT cancel-button)
+
+ (add-components-to-form form
+ info-textbox
+ listbox scan-button
+ cancel-button)
+ (make-wrapped-grid-window
+ (basic-window-grid info-textbox middle-grid buttons-grid)
+ (G_ "Wifi selection"))
+
+ (receive (exit-reason argument)
+ (run-form form)
+ (dynamic-wind
+ (const #t)
+ (lambda ()
+ (when (eq? exit-reason 'exit-component)
+ (cond
+ ((components=? argument scan-button)
+ (run-wifi-scan-page)
+ (run-wifi-page))
+ ((components=? argument cancel-button)
+ (raise
+ (condition
+ (&installer-step-abort))))
+ ((components=? argument listbox)
+ (let ((result (connect-wifi-service listbox service-items)))
+ (unless result
+ (run-wifi-page)))))))
+ (lambda ()
+ (destroy-form-and-pop form))))))