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guix/gnu/build/jami-service.scm
Maxim Cournoyer 10f554700c
Reinstate "services: Add a service for Jami." 
This reverts commit 4673f81793, which reverted
commit 69dcc24c9f with the fix detailed below.

Thanks to Christopher Baines for reporting the failure and proposing a fix.

* guix/self.scm (compiled-guix) [*system-test-modules*]: Add the test data
files via the 'extra-files' argument.
* gnu/local.mk (dist_patch_DATA): Move the tests/data/jami-dummy-account.dat
file to...
* gnu/local.mk (MODULES_NOT_COMPILED): ... here.
2021-08-02 17:23:30 -04:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@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/>.
;;; Commentary:
;;;
;;; This module contains helpers used as part of the jami-service-type
;;; definition.
;;;
;;; Code:
(define-module (gnu build jami-service)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (ice-9 peg)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (rnrs io ports)
#:autoload (shepherd service) (fork+exec-command)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:export (account-fingerprint?
account-details->recutil
get-accounts
get-usernames
set-account-details
add-account
account->username
username->account
username->contacts
enable-account
disable-account
add-contact
remove-contact
set-all-moderators
set-moderator
username->all-moderators?
username->moderators
dbus-available-services
dbus-service-available?
%send-dbus-binary
%send-dbus-bus
%send-dbus-user
%send-dbus-group
%send-dbus-debug
send-dbus
with-retries))
;;;
;;; Utilities.
;;;
(define-syntax-rule (with-retries n delay body ...)
"Retry the code in BODY up to N times until it doesn't raise an exception
nor return #f, else raise an error. A delay of DELAY seconds is inserted
before each retry."
(let loop ((attempts 0))
(catch #t
(lambda ()
(let ((result (begin body ...)))
(if (not result)
(error "failed attempt" attempts)
result)))
(lambda args
(if (< attempts n)
(begin
(sleep delay) ;else wait and retry
(loop (+ 1 attempts)))
(error "maximum number of retry attempts reached"
body ... args))))))
(define (alist->list alist)
"Flatten ALIST into a list."
(append-map (match-lambda
(() '())
((key . value)
(list key value)))
alist))
(define account-fingerprint-rx (make-regexp "[0-9A-f]{40}"))
(define (account-fingerprint? val)
"A Jami account fingerprint is 40 characters long and only contains
hexadecimal characters."
(and (string? val)
(regexp-exec account-fingerprint-rx val)))
;;;
;;; D-Bus reply parser.
;;;
(define (parse-dbus-reply reply)
"Return the parse tree of REPLY, a string returned by the 'dbus-send'
command."
;; Refer to 'man 1 dbus-send' for the grammar reference. Note that the
;; format of the replies doesn't match the format of the input, which is the
;; one documented, but it gives an idea. For an even better reference, see
;; the `print_iter' procedure of the 'dbus-print-message.c' file from the
;; 'dbus' package sources.
(define-peg-string-patterns
"contents <- header (item / container (item / container*)?)
item <-- WS type WS value NL
container <- array / dict / variant
array <-- array-start (item / container)* array-end
dict <-- array-start dict-entry* array-end
dict-entry <-- dict-entry-start item item dict-entry-end
variant <-- variant-start item
type <-- 'string' / 'int16' / 'uint16' / 'int32' / 'uint32' / 'int64' /
'uint64' / 'double' / 'byte' / 'boolean' / 'objpath'
value <-- (!NL .)* NL
header < (!NL .)* NL
variant-start < WS 'variant'
array-start < WS 'array [' NL
array-end < WS ']' NL
dict-entry-start < WS 'dict entry(' NL
dict-entry-end < WS ')' NL
DQ < '\"'
WS < ' '*
NL < '\n'*")
(peg:tree (match-pattern contents reply)))
(define (strip-quotes text)
"Strip the leading and trailing double quotes (\") characters from TEXT."
(let* ((text* (if (string-prefix? "\"" text)
(string-drop text 1)
text))
(text** (if (string-suffix? "\"" text*)
(string-drop-right text* 1)
text*)))
text**))
(define (deserialize-item item)
"Return the value described by the ITEM parse tree as a Guile object."
;; Strings are printed wrapped in double quotes (see the print_iter
;; procedure in dbus-print-message.c).
(match item
(('item ('type "string") ('value value))
(strip-quotes value))
(('item ('type "boolean") ('value value))
(if (string=? "true" value)
#t
#f))
(('item _ ('value value))
value)))
(define (serialize-boolean bool)
"Return the serialized format expected by dbus-send for BOOL."
(format #f "boolean:~:[false~;true~]" bool))
(define (dict->alist dict-parse-tree)
"Translate a dict parse tree to an alist."
(define (tuples->alist tuples)
(map (lambda (x) (apply cons x)) tuples))
(match dict-parse-tree
('dict
'())
(('dict ('dict-entry keys values) ...)
(let ((keys* (map deserialize-item keys))
(values* (map deserialize-item values)))
(tuples->alist (zip keys* values*))))))
(define (array->list array-parse-tree)
"Translate an array parse tree to a list."
(match array-parse-tree
('array
'())
(('array items ...)
(map deserialize-item items))))
;;;
;;; Low-level, D-Bus-related procedures.
;;;
;;; The following parameters are used in the jami-service-type service
;;; definition to conveniently customize the behavior of the send-dbus helper,
;;; even when called indirectly.
(define %send-dbus-binary (make-parameter "dbus-send"))
(define %send-dbus-bus (make-parameter #f))
(define %send-dbus-user (make-parameter #f))
(define %send-dbus-group (make-parameter #f))
(define %send-dbus-debug (make-parameter #f))
(define* (send-dbus #:key service path interface method
bus
dbus-send
user group
timeout
arguments)
"Return the response of DBUS-SEND, else raise an error. Unless explicitly
provided, DBUS-SEND takes the value of the %SEND-DBUS-BINARY parameter. BUS
can be used to specify the bus address, such as 'unix:path=/var/run/jami/bus'.
Alternatively, the %SEND-DBUS-BUS parameter can be used. ARGUMENTS can be
used to pass input values to a D-Bus method call. TIMEOUT is the amount of
time to wait for a reply in milliseconds before giving up with an error. USER
and GROUP allow choosing under which user/group the DBUS-SEND command is
executed. Alternatively, the %SEND-DBUS-USER and %SEND-DBUS-GROUP parameters
can be used instead."
(let* ((command `(,(if dbus-send
dbus-send
(%send-dbus-binary))
,@(if (or bus (%send-dbus-bus))
(list (string-append "--bus="
(or bus (%send-dbus-bus))))
'())
"--print-reply"
,@(if timeout
(list (format #f "--reply-timeout=~d" timeout))
'())
,(string-append "--dest=" service) ;e.g., cx.ring.Ring
,path ;e.g., /cx/ring/Ring/ConfigurationManager
,(string-append interface "." method)
,@(or arguments '())))
(temp-port (mkstemp! (string-copy "/tmp/dbus-send-output-XXXXXXX")))
(temp-file (port-filename temp-port)))
(dynamic-wind
(lambda ()
(let* ((uid (or (and=> (or user (%send-dbus-user))
(compose passwd:uid getpwnam)) -1))
(gid (or (and=> (or group (%send-dbus-group))
(compose group:gid getgrnam)) -1)))
(chown temp-port uid gid)))
(lambda ()
(let ((pid (fork+exec-command command
#:user (or user (%send-dbus-user))
#:group (or group (%send-dbus-group))
#:log-file temp-file)))
(match (waitpid pid)
((_ . status)
(let ((exit-status (status:exit-val status))
(output (call-with-port temp-port get-string-all)))
(if (= 0 exit-status)
output
(error "the send-dbus command exited with: "
command exit-status output)))))))
(lambda ()
(false-if-exception (delete-file temp-file))))))
(define (parse-account-ids reply)
"Return the Jami account IDs from REPLY, which is assumed to be the output
of the Jami D-Bus `getAccountList' method."
(array->list (parse-dbus-reply reply)))
(define (parse-account-details reply)
"Parse REPLY, which is assumed to be the output of the Jami D-Bus
`getAccountDetails' method, and return its content as an alist."
(dict->alist (parse-dbus-reply reply)))
(define (parse-contacts reply)
"Parse REPLY, which is assumed to be the output of the Jamid D-Bus
`getContacts' method, and return its content as an alist."
(match (parse-dbus-reply reply)
('array
'())
(('array dicts ...)
(map dict->alist dicts))))
;;;
;;; Higher-level, D-Bus-related procedures.
;;;
(define (validate-fingerprint fingerprint)
"Validate that fingerprint is 40 characters long."
(unless (account-fingerprint? fingerprint)
(error "Account fingerprint is not valid:" fingerprint)))
(define (dbus-available-services)
"Return the list of available (acquired) D-Bus services."
(let ((reply (parse-dbus-reply
(send-dbus #:service "org.freedesktop.DBus"
#:path "/org/freedesktop/DBus"
#:interface "org.freedesktop.DBus"
#:method "ListNames"))))
;; Remove entries such as ":1.7".
(remove (cut string-prefix? ":" <>)
(array->list reply))))
(define (dbus-service-available? service)
"Predicate to check for the D-Bus SERVICE availability."
(member service (dbus-available-services)))
(define* (send-dbus/configuration-manager #:key method arguments timeout)
"Query the Jami D-Bus ConfigurationManager service."
(send-dbus #:service "cx.ring.Ring"
#:path "/cx/ring/Ring/ConfigurationManager"
#:interface "cx.ring.Ring.ConfigurationManager"
#:method method
#:arguments arguments
#:timeout timeout))
;;; The following methods are for internal use; they make use of the account
;;; ID, an implementation detail of Jami the user should not need to be
;;; concerned with.
(define (get-account-ids)
"Return the available Jami account identifiers (IDs). Account IDs are an
implementation detail used to identify the accounts in Jami."
(parse-account-ids
(send-dbus/configuration-manager #:method "getAccountList")))
(define (id->account-details id)
"Retrieve the account data associated with the given account ID."
(parse-account-details
(send-dbus/configuration-manager
#:method "getAccountDetails"
#:arguments (list (string-append "string:" id)))))
(define (id->volatile-account-details id)
"Retrieve the account data associated with the given account ID."
(parse-account-details
(send-dbus/configuration-manager
#:method "getVolatileAccountDetails"
#:arguments (list (string-append "string:" id)))))
(define (id->account id)
"Retrieve the complete account data associated with the given account ID."
(append (id->volatile-account-details id)
(id->account-details id)))
(define %username-to-id-cache #f)
(define (invalidate-username-to-id-cache!)
(set! %username-to-id-cache #f))
(define (username->id username)
"Return the first account ID corresponding to USERNAME."
(unless (assoc-ref %username-to-id-cache username)
(set! %username-to-id-cache
(append-map
(lambda (id)
(let* ((account (id->account id))
(username (assoc-ref account "Account.username"))
(registered-name (assoc-ref account
"Account.registeredName")))
`(,@(if username
(list (cons username id))
'())
,@(if registered-name
(list (cons registered-name id))
'()))))
(get-account-ids))))
(or (assoc-ref %username-to-id-cache username)
(let ((message (format #f "Could not retrieve a local account ID\
for ~:[username~;fingerprint~]" (account-fingerprint? username))))
(error message username))))
(define (account->username account)
"Return USERNAME, the registered username associated with ACCOUNT, else its
public key fingerprint."
(or (assoc-ref account "Account.registeredName")
(assoc-ref account "Account.username")))
(define (id->username id)
"Return USERNAME, the registered username associated with ID, else its
public key fingerprint, else #f."
(account->username (id->account id)))
(define (get-accounts)
"Return the list of all accounts, as a list of alists."
(map id->account (get-account-ids)))
(define (get-usernames)
"Return the list of the usernames associated with the present accounts."
(map account->username (get-accounts)))
(define (username->account username)
"Return the first account associated with USERNAME, else #f.
USERNAME can be either the account 40 characters public key fingerprint or a
registered username."
(find (lambda (account)
(member username
(list (assoc-ref account "Account.username")
(assoc-ref account "Account.registeredName"))))
(get-accounts)))
(define (add-account archive)
"Import the Jami account ARCHIVE and return its account ID. The archive
should *not* be encrypted with a password. Return the username associated
with the account."
(invalidate-username-to-id-cache!)
(let ((reply (send-dbus/configuration-manager
#:method "addAccount"
#:arguments (list (string-append
"dict:string:string:Account.archivePath,"
archive
",Account.type,RING")))))
;; The account information takes some time to be populated.
(let ((id (deserialize-item (parse-dbus-reply reply))))
(with-retries 20 1
(let ((username (id->username id)))
(if (string-null? username)
#f
username))))))
(define (remove-account username)
"Delete the Jami account associated with USERNAME, the account 40 characters
fingerprint or a registered username."
(let ((id (username->id username)))
(send-dbus/configuration-manager
#:method "removeAccount"
#:arguments (list (string-append "string:" id))))
(invalidate-username-to-id-cache!))
(define* (username->contacts username)
"Return the contacts associated with the account of USERNAME as two values;
the first one being the regular contacts and the second one the banned
contacts. USERNAME can be either the account 40 characters public key
fingerprint or a registered username. The contacts returned are represented
using their 40 characters fingerprint."
(let* ((id (username->id username))
(reply (send-dbus/configuration-manager
#:method "getContacts"
#:arguments (list (string-append "string:" id))))
(all-contacts (parse-contacts reply))
(banned? (lambda (contact)
(and=> (assoc-ref contact "banned")
(cut string=? "true" <>))))
(banned (filter banned? all-contacts))
(not-banned (filter (negate banned?) all-contacts))
(fingerprint (cut assoc-ref <> "id")))
(values (map fingerprint not-banned)
(map fingerprint banned))))
(define* (remove-contact contact username #:key ban?)
"Remove CONTACT, the 40 characters public key fingerprint of a contact, from
the account associated with USERNAME (either a fingerprint or a registered
username). When BAN? is true, also mark the contact as banned."
(validate-fingerprint contact)
(let ((id (username->id username)))
(send-dbus/configuration-manager
#:method "removeContact"
#:arguments (list (string-append "string:" id)
(string-append "string:" contact)
(serialize-boolean ban?)))))
(define (add-contact contact username)
"Add CONTACT, the 40 characters public key fingerprint of a contact, to the
account of USERNAME (either a fingerprint or a registered username)."
(validate-fingerprint contact)
(let ((id (username->id username)))
(send-dbus/configuration-manager
#:method "addContact"
#:arguments (list (string-append "string:" id)
(string-append "string:" contact)))))
(define* (set-account-details details username #:key timeout)
"Set DETAILS, an alist containing the key value pairs to set for the account
of USERNAME, a registered username or account fingerprint. The value of the
parameters not provided are unchanged. TIMEOUT is a value in milliseconds to
pass to the `send-dbus/configuration-manager' procedure."
(let* ((id (username->id username))
(current-details (id->account-details id))
(updated-details (map (match-lambda
((key . value)
(or (and=> (assoc-ref details key)
(cut cons key <>))
(cons key value))))
current-details))
;; dbus-send does not permit sending null strings (it throws a
;; "malformed dictionary" error). Luckily they seem to have the
;; semantic of "default account value" in Jami; so simply drop them.
(updated-details* (remove (match-lambda
((_ . value)
(string-null? value)))
updated-details)))
(send-dbus/configuration-manager
#:timeout timeout
#:method "setAccountDetails"
#:arguments
(list (string-append "string:" id)
(string-append "dict:string:string:"
(string-join (alist->list updated-details*)
","))))))
(define (set-all-moderators enabled? username)
"Set the 'AllModerators' property to enabled? for the account of USERNAME, a
registered username or account fingerprint."
(let ((id (username->id username)))
(send-dbus/configuration-manager
#:method "setAllModerators"
#:arguments
(list (string-append "string:" id)
(serialize-boolean enabled?)))))
(define (username->all-moderators? username)
"Return the 'AllModerators' property for the account of USERNAME, a
registered username or account fingerprint."
(let* ((id (username->id username))
(reply (send-dbus/configuration-manager
#:method "isAllModerators"
#:arguments
(list (string-append "string:" id)))))
(deserialize-item (parse-dbus-reply reply))))
(define (username->moderators username)
"Return the moderators for the account of USERNAME, a registered username or
account fingerprint."
(let* ((id (username->id username))
(reply (send-dbus/configuration-manager
#:method "getDefaultModerators"
#:arguments
(list (string-append "string:" id)))))
(array->list (parse-dbus-reply reply))))
(define (set-moderator contact enabled? username)
"Set the moderator flag to ENABLED? for CONTACT, the 40 characters public
key fingerprint of a contact for the account of USERNAME, a registered
username or account fingerprint."
(validate-fingerprint contact)
(let* ((id (username->id username)))
(send-dbus/configuration-manager #:method "setDefaultModerator"
#:arguments
(list (string-append "string:" id)
(string-append "string:" contact)
(serialize-boolean enabled?)))))
(define (disable-account username)
"Disable the account known by USERNAME, a registered username or account
fingerprint."
(set-account-details '(("Account.enable" . "false")) username
;; Waiting for the reply on this command takes a very
;; long time that trips the default D-Bus timeout value
;; (25 s), for some reason.
#:timeout 60000))
(define (enable-account username)
"Enable the account known by USERNAME, a registered username or account
fingerprint."
(set-account-details '(("Account.enable" . "true")) username))
;;;
;;; Presentation procedures.
;;;
(define (.->_ text)
"Map each period character to underscore characters."
(string-map (match-lambda
(#\. #\_)
(c c))
text))
(define (account-details->recutil account-details)
"Serialize the account-details alist into a recutil string. Period
characters in the keys are normalized to underscore to meet Recutils' format
requirements."
(define (pair->recutil-property pair)
(match pair
((key . value)
(string-append (.->_ key) ": " value))))
(define sorted-account-details
;; Have the account username, display name and alias appear first, for
;; convenience.
(let ((first-items '("Account.username"
"Account.displayName"
"Account.alias")))
(append (map (cut assoc <> account-details) first-items)
(fold alist-delete account-details first-items))))
(string-join (map pair->recutil-property sorted-account-details) "\n"))
;; Local Variables:
;; eval: (put 'with-retries 'scheme-indent-function 2)
;; End:
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