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GNU AFFERO GENERAL PUBLIC LICENSE
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;;
;; Copyright 2023, Jaidyn Levesque <jadedctrl@posteo.at>
;;
;; This program 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.
;;
;; 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 General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;
(ql:quickload '(clack str yason))
;; List of the server's usernames.
(defun users () '("rod" "mum"))
;; Alist of the server's paths and their response functions.
(defun directories () '(("u/" . http-user-dir)))
;; The default 404 response.
(defun http-404 (env path-items params)
'(404 (:content-type "text/plain")
("uh-oh, I did a war crime!")))
;; Respond to requests within the /u/* directory.
(defun http-user-dir (env path-items params)
(let ((user (car path-items)))
;; In case of request for the user's actor.
(if (member user (users) :test 'string=)
`(200 (:content-type "application/ld+json")
(,(user-actor user))))))
;; Returns the response data for Clack, given the request data `env`.
(defun server (env)
(let* ((path-split-? (str:split #\? (getf env :request-uri)))
(path (car path-split-?))
(params (cadr path-split-?))
(response-function
(or (assoc-by-path *directories* (pathname-components path))
'("" . http-404)))
;; So that response functions only deal with relative paths…
(path-sans-response-root
(pathname-components
(str:replace-first (car response-function) "" path))))
(or (funcall (cdr response-function) env path-sans-response-root params)
(funcall 'http-404 env path-sans-response-root params))))
;; Start the server.
(defparameter *handler*
(clack:clackup (lambda (env)
(funcall 'server env))
:server 'woo))
;; The JSON of a user's actor.
(defun user-actor (username)
(let* ((host "http://localhost")
(user-root (str:concat host "/u/" username)))
(yason:with-output-to-string* ()
(yason:encode-alist
`(("@context" . ("https://www.w3.org/ns/activitystreams"
"https://w3id.org/security/v1"))
("id" . ,user-root)
("type" . "Person")
("preferredUsername" . ,username)
("inbox" . ,(str:concat user-root "/inbox.json"))
("outbox" . ,(str:concat user-root "/outbox.json")))))))
;; Given an associative list and a path decomposed into a list of
;; its components, return the item with the closest according
;; pathname as key. If the exact path isn't a valid key, it will
;; try all parent directories.
;; E.g., "/bear/apple/momma/" could match either "/bear/apple/momma"
;; or "/bear/apple/" or "/bear/", but not "/bear" (not a directory).
(defun assoc-by-path (alist path-items &optional (depth 0))
(let ((path (str:join #\/ path-items)))
(if (eq path-items nil)
(assoc "" alist :test 'string=)
(or (and (eq depth 0)
(assoc path alist :test 'string=))
(assoc (str:concat path "/")
alist :test 'string=)
(assoc-by-path
alist (reverse
(cdr (reverse path-items)))
(+ depth 1))))))
;; Split a pathname into a list of its components.
;; "/u/bear/apple.txt" → '("u" "bear" "apple.txt")
(defun pathname-components (pathname)
(str:split #\/ pathname :omit-nulls 't))

5
activitypub-servist.asd
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@ -1,5 +0,0 @@
(defsystem "activitypub-servist"
:depends-on ("alexandria" "clack" "dexador" "inferior-shell" "ironclad" "local-time" "purl" "str" "webtentacle" "yason")
:components ((:file "activitypub-servist")))
;; (ql:quickload '(alexandria clack dexador inferior-shell ironclad local-time purl str webtentacle yason))

458
activitypub-servist.lisp
View File

@ -1,458 +0,0 @@
;;; Copyright © 2023 Jaidyn Levesque <jadedctrl@posteo.at>
;;;
;;; 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 <https://www.gnu.org/licenses/>.
(defpackage #:activitypub-servist
(:use #:cl)
(:export :server :start-server))
(in-package #:activitypub-servist)
(defun users ()
"List of the server's usernames."
'("servisto"))
(defun userhosts ()
"List of the server's usernames + hostname."
(mapcar (lambda (username) (str:concat username "@" "etc.xwx.moe"))
(users)))
(defun directories ()
"Alist of the server's paths and their response functions."
'(("u/" . http-user-dir)
(".well-known/webfinger" . http-webfinger)
(".well-known/host-meta" . http-host-meta)))
;; ————————————————————————————————————————
;; Host-info response
;; ————————————————————————————————————————
(defun http-host-meta (&optional env path-items params)
`(200 (:content-type "application/xrd+xml; charset=utf-8")
(,(str:concat "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<XRD xmlns=\"http://docs.oasis-open.org/ns/xri/xrd-1.0\">
<link rel=\"lrdd\" type=\"application/xrd+xml\" template=\"https://"
(getf env :domain)
"/.well-known/webfinger?resource={uri}\"/>
</XRD>
"))))
;; ————————————————————————————————————————
;; Webfinger response
;; ————————————————————————————————————————
(defun http-webfinger (env path-items params)
(webtentacle:server env (lambda (resource) (resource-info-func resource)) nil))
(defun resource-userhost (resource)
"Given an account URI in webfinger-friendly format, return the corresponding)))
username and host in a list. Whether or not these are valid… that’s your
business!
Ex: acct:mom@bird.com → '(“mom” “bird.com”)"
(cond
;; A @bird@mom-style resource
((str:containsp "@" resource)
(let* ((sans-acct (if (str:starts-with-p "acct:" resource)
(subseq resource 5)
resource))
(sans-@ (if (str:starts-with-p "@" sans-acct)
(subseq sans-acct 1)
sans-acct)))
(destructuring-bind (user host)
(str:split "@" sans-@)
(cons user host))))
;; A URL-style resource
((str:containsp "/u/" resource)
(cons
(pathname-name resource)
(purl:url-host resource)))))
(defun resource-valid-p (resource)
"Given a webfinger-style “resource”"
(let* ((userhost (resource-userhost resource))
(userhost-str (funcall #'str:concat (car userhost) "@" (cdr userhost))))
(member userhost-str (userhosts)
:test (lambda (a b)
(string-equal (string-downcase a)
(string-downcase b))))))
(defun resource-info-func (resource)
"Given a webfinger RESOURCE, return a property-list of data on the given user…
if they exist, that is.
This is used by the WEBTENTACLE webfinger server; you can see information on
the plist in the docstring for its WEBTENTACLE:SERVER function."
(let* ((userhost (resource-userhost resource))
(profile (str:concat "https://" (cdr userhost) "/u/" (car userhost))))
(when (resource-valid-p resource)
(list
:subject (str:concat "acct:" (car userhost) "@" (cdr userhost))
:aliases `(,profile)
:links
`((href ,profile
rel "self"
type "application/activity+json")
(href ,profile
rel "self"
type "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"")
(template ,(str:concat "https://" (cdr userhost) "/ostatus_subscribe?acct={uri}")
rel "http://ostatus.org/schema/1.0/subscribe"))))))
;; ————————————————————————————————————————
;; User info response(s)
;; ————————————————————————————————————————
;; Respond to requests within the /u/* directory.
(defun http-user-dir (env path-items params)
(let ((user (car path-items)))
;; In case of request for the user's actor.
(if (member user (users) :test 'string=)
`(200 (:content-type "application/ld+json")
(,(user-actor env user))))))
(defun user-actor (config username)
"The JSON of a user's actor."
(let* ((user-root (str:concat "https://" (getf config :domain) "/u/" username))
(yason:*symbol-encoder* 'yason:encode-symbol-as-lowercase))
(yason:with-output-to-string* ()
(yason:encode-alist
`(("@context" . ("https://www.w3.org/ns/activitystreams"
"https://litepub.social/litepub/context.jsonld"))
("id" . ,user-root)
("type" . "Person")
("preferredUsername" . ,username)
("name" . "Servistiĉo")
("inbox" . ,(str:concat user-root "/inbox.json"))
("outbox" . ,(str:concat user-root "/outbox.json"))
("summary" . "Mi estas simpla roboto, kiu montras ke iomete ekfunkcias activitypub-servist.
… ĉu mi rajtas demeti la servistinan kostumon, nun?
Mi ne estas knabino!!")
("icon"
. ,(alexandria:plist-hash-table
(list
"type" "Image"
"url" "https://xwx.moe/etc/servisticho-profilbildo.png")))
("image"
. ,(alexandria:plist-hash-table
(list
"type" "Image"
"url" "https://xwx.moe/etc/servisticho-standardo.png")))
("publicKey"
. ,(alexandria:plist-hash-table
(list
"id" (str:concat user-root "#main-key")
"owner" user-root
"publicKeyPem" *pubkey*))))))))
;; ————————————————————————————————————————
;; Sending a note
;; ————————————————————————————————————————
(defun note-json (from to text)
"The JSON of a user's actor."
(let* ((user-root (str:concat "https://etc.xwx.moe/u/" from))
(yason:*symbol-encoder* 'yason:encode-symbol-as-lowercase))
(yason:with-output-to-string* ()
(yason:encode-alist
`(("@context" . ("https://www.w3.org/ns/activitystreams"
"https://litepub.social/litepub/context.jsonld"))
("id" . ,(format nil "~A" (random 900000)))
("actor" . ,user-root)
("type" . "Create")
("object"
. ,(alexandria:plist-hash-table
(list
"id" (format nil "~A" (random 900000))
"type" "Note"
"attributedTo" user-root
"content" text
"to" (if (listp to) to (list to))))))))))
(defvar +date-header-datetime-format+
'(:short-weekday ", " (:day 2) " " :short-month " " (:year 4) " "
(:hour 2) #\: (:min 2) #\: (:sec 2) " " :timezone))
(defun note-headers (inbox from to text)
(let* ((json (note-json from to text))
(inbox-uri (quri:uri inbox))
(digest-header (str:concat "SHA-256=" (string-sha256sum json)))
(date-header
(let ((local-time:*default-timezone* local-time:+gmt-zone+))
(local-time:format-timestring
nil (local-time:now)
:format +date-header-datetime-format+)))
(signed-headers (str:unlines
(list
(str:concat "(request target): post " (quri:uri-path inbox-uri))
(str:concat "host: " (quri:uri-host inbox-uri))
(str:concat "date: " date-header)
(str:concat "digest: " digest-header))))
(signature (base64:usb8-array-to-base64-string
(ironclad:sign-message (openssl-shell-import-key-pair *privkey*)
(string-to-ub8-vector signed-headers))))
(signature-header (str:concat "keyId=\"" from "#main-key\","
"headers=\"(request-target) host date digest\","
"algorithm=\"rsa-sha256\","
"signature=\"" signature "\"")))
`(("Date" . ,date-header)
("Digest" . ,digest-header)
("Signature" . ,signature-header)
("Host" . ,(quri:uri-host inbox-uri))
("Content-Length" . ,(length json))
("Content-Type" . "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\""))))
(defun send-note (inbox from to text)
(dexador:post inbox :content (note-json from to text)
:headers (note-headers inbox from to text)))
;; ————————————————————————————————————————
;; Misc. responses
;; ————————————————————————————————————————
(defun http-404 (env path-items params)
"The default 404 response."
'(404 (:content-type "text/plain")
("404, you goddamn fool!")))
(defvar *logs* '())
;; ————————————————————————————————————————
;; Invocation
;; ————————————————————————————————————————
(defun server (env)
"Returns the response data for Clack, given the request data `env`."
(setq *logs* (append *logs* (list env)))
(let* ((path (pathname-sans-parameters (getf env :request-uri)))
(params (pathname-parameters (getf env :request-uri)))
(response-function
(or (assoc-by-path (directories) (pathname-components path))
'("" . http-404)))
;; So that response functions only deal with relative paths…
(path-sans-response-root
(pathname-components
(str:replace-first (car response-function) "" path))))
(format nil "Path: ~s" path)
(or (funcall (cdr response-function) env path-sans-response-root params)
(funcall 'http-404 env path-sans-response-root params))))
(defun start-server (&optional (config '(:domain "etc.xwx.moe")))
"Start the server."
(clack:clackup (lambda (env)
(server (append env config)))
:server 'woo
:address "0.0.0.0"
:port (getf config :port)))
;; ————————————————————————————————————————
;; Utils.
;; ————————————————————————————————————————
(defun assoc-by-path (alist path-items &optional (depth 0))
"Given an associative list and a path decomposed into a list of
its components, return the item with the closest according
pathname as key. If the exact path isn't a valid key, it will
try all parent directories.
E.g., “/bear/apple/momma/” could match either “/bear/apple/momma”
or “/bear/apple/” or “/bear/”, but not “/bear” (not a directory)."
(let ((path (str:join #\/ path-items)))
(if (eq path-items nil)
(assoc "" alist :test 'string=)
(or (and (eq depth 0)
(assoc path alist :test 'string=))
(assoc (str:concat path "/")
alist :test 'string=)
(assoc-by-path
alist (reverse
(cdr (reverse path-items)))
(+ depth 1))))))
(defun pathname-sans-parameters (path)
"Removes parameters from a URI pathname, returning the bare path.
“/path/a/b?a=1&b=3” → “/path/a/b”"
(car (str:split #\? path)))
(defun pathname-parameters (path)
"Convert the parameters of a URI pathname into an associative list.
“/path/a/b?a=1&b=2&c=3” → ((“a” . “1”) (“b” . “2”) (“c” . “3”))"
(mapcar
(lambda (pair)
(let ((pair-items (str:split #\= pair)))
(cons (car pair-items)
(cadr pair-items))))
(str:split #\& (cadr (str:split #\? path)))))
(defun pathname-components (pathname)
"Split a pathname into a list of its components.
“/u/bear/apple.txt” → '(“u” “bear” “apple.txt”)"
(str:split #\/ pathname :omit-nulls 't))
(defun string-to-ub8-vector (string)
"Convert the given STRING into an unsigned 8-bit vector."
(coerce
(loop for char across string
collect (char-code char))
'(vector (unsigned-byte 8))))
(defun digest-string (digest-spec string)
"Compute the digest of a STRING, given an Ironclad DIGEST-SPEC."
(ironclad:digest-sequence digest-spec (string-to-ub8-vector string)))
(defun string-sha256sum (string)
"Compute the sha256 checksum of a STRING, in hexadecimal string-format."
(base64:usb8-array-to-base64-string
(digest-string (ironclad:make-digest :sha256) string)))
(defun sequence-hexadecimal-string (sequence)
(reduce #'str:concat
(loop for number across
sequence
collect (format nil "~X" number))))
;; ————————————————————————————————————————
;; RSA keys
;; ————————————————————————————————————————
;; At the moment, I’ve yet to use figure out how to create PEM representations of
;; a public keypair properly in Lisp.
;; So at the moment, keys are generated into PEM files by the openssl binary on
;; the host’s system; and the output of the openssl command is used to parse into
;; Ironclad keys.
;; Yes, I know, this is absolutely horrific. Actually disgusting.
;; But at the moment,I want to focus on other core parts of ActivityPub; I’ve
;; tired of messing with ASN1 & co. That’s for another day! ^^
(defun openssl-shell-generate-key-pair ()
"Generate a 2048-bit RSA key-pair in PEM-format using one’s `openssl` binary.
It returns two values: The private key, then the public key."
(let* ((private-pem-key (inferior-shell:run/s "openssl genrsa 2048"))
(public-pem-key
(inferior-shell:run/s
`(inferior-shell:pipe (echo ,private-pem-key)
(openssl rsa -outform PEM -pubout)))))
(values private-pem-key
public-pem-key)))
(defun openssl-shell-destructure-private-key (pem-string &optional results)
"When passed the output of the shell command `openssl rsa -text -noout`, will
parse the output into a plist containing relavent numbers:
:n (modulus), :e (public exponent), :d (private exponent), :p (1st prime),
:q (2nd prime), :e1 (1st exponent), :e2 (2nd exponent), and :c (coefficient)."
(let* ((lines (if (stringp pem-string)
(inferior-shell:run/lines
`(inferior-shell:pipe
(echo ,pem-string)
(openssl rsa -text -noout)))
pem-string))
(line (str:trim (car lines))))
(cond
((not lines)
(mapcar
(lambda (result-item)
(if (stringp result-item)
(parse-integer (str:replace-all ":" "" result-item) :radix 16)
result-item))
results))
((str:starts-with-p "Private" line)
(openssl-shell-destructure-private-key
(cdr lines) results))
((str:starts-with-p "modulus:" line)
(openssl-shell-destructure-private-key
(cdr lines) (nconc results '(:n))))
((str:starts-with-p "prime1" line)
(openssl-shell-destructure-private-key
(cdr lines) (nconc results '(:p))))
((str:starts-with-p "prime2" line)
(openssl-shell-destructure-private-key
(cdr lines) (nconc results '(:q))))
((str:starts-with-p "exponent1" line)
(openssl-shell-destructure-private-key
(cdr lines) (nconc results '(:e1))))
((str:starts-with-p "exponent2" line)
(openssl-shell-destructure-private-key
(cdr lines) (nconc results '(:e2))))
((str:starts-with-p "coefficient" line)
(openssl-shell-destructure-private-key
(cdr lines) (nconc results '(:c))))
((str:starts-with-p "privateExponent" line)
(openssl-shell-destructure-private-key
(cdr lines) (nconc results '(:d))))
((str:starts-with-p "publicExponent" line)
(openssl-shell-destructure-private-key
(cdr lines)
(nconc
results
(list
:e
(parse-integer
(car (str:split #\space
(str:replace-first
"publicExponent: "
""
line))))))))
('t
(let* ((last-element (car (last results)))
(total-string (if (stringp last-element)
(str:concat last-element line)
line)))
(openssl-shell-destructure-private-key
(cdr lines)
(if (stringp last-element)
(nconc (reverse (cdr (reverse results)))
(list total-string))
(nconc results
(list total-string)))))))))
(defun openssl-shell-import-key-pair (private-pem-string)
"Given the string value of a private RSA PEM file, this will parse it into two
returned values: An Ironclad private key, and an Ironclad public key."
(let ((key-values
(openssl-shell-destructure-private-key private-pem-string)))
(values (ironclad:make-private-key
:rsa
:n (getf key-values :n)
:e (getf key-values :e)
:d (getf key-values :d)
:p (getf key-values :p)
:q (getf key-values :q))
(ironclad:make-public-key
:rsa
:n (getf key-values :n)
:e (getf key-values :e)))))