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;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
(declaim (optimize (speed 0) (safety 3) (debug 3)))
(in-package #:dns-admin)
(defvar *acceptor* nil)
(defvar *dispatch-table* '(#'dispatch-easy-handlers #'default-dispatcher))
(defvar *webapps* (make-hash-table :test 'equal))
(defvar *webapp* nil)
(defvar *uri* nil)
(defvar *header-register* nil)
(defvar *sessionid* nil)
(defvar *session-timeout* (* 4 60 60))
(defparameter *port* 3000)
(defparameter *conf-file* "/etc/dns-admin/conf.lisp")
(defparameter *creds-file* "/etc/dns-admin/creds.lisp")
(defclass webapp ()
((name :initarg :name
:initform nil
:accessor name
:documentation "The name of the webapp as used in the code. A
string used as the key to any webapp config lookup.")
(document-root :initarg :document-root
:initform nil
:accessor document-root
:documentation "The absolute filesystem path to
the webapp's top-level directory, which is inside the webapps
folder.")
(title :initarg :title
:initform nil
:accessor title
:documentation "The default title that shows up in
the browser title bar.")
(meta-description :initarg :meta-description
:initform nil
:accessor meta-description
:documentation "The text that goes into the META DESCRIPTION
tag, and anywhere else we want to put this text so that it will show
up in Google.")
(proxy :initarg :proxy
:initform nil
:accessor proxy)
(dns :initarg :dns
:initform nil
:accessor dns))
(:documentation ""))
(defmethod get-site-file-path ((webapp webapp))
(format nil "~a/site" (document-root webapp)))
(defmethod get-pages-file-paths ((webapp webapp))
(mapcar (lambda (pages-file)
(ppcre:regex-replace-all "\\.lisp$" (format nil "~a" pages-file) ""))
(remove-if (lambda (x) (equal x "shared"))
(shell-wrapper (format nil "find '~a' -maxdepth 1 -type f -iname 'pages*.lisp' |sort" (document-root webapp))))))
(defun make-webapp-path (relative-path)
"Makes an absolute filesystem path to a location in the webapps
folder."
(concatenate 'string *server-root* "webapps/" relative-path))
(defun set-webapp (webapp)
"Sets a `webapp' object in `*webapps*'. The lookup key is the webapp
name. If a webapp already exists under this key, it gets overwritten
with the new one."
(setf (gethash (name webapp) *webapps*) webapp))
(defun get-webapp (key)
"Gets the webapp object stored under the key `key'."
(gethash key *webapps*))
(defun generate-sessionid ()
"Generates a unique random string to seed the
`*session-secret*'. The string is a SHA256 hash."
(let ((entropic-value (make-array '(32) :element-type '(unsigned-byte 8))))
(with-open-file (urandom-file "/dev/urandom" :direction :input :element-type '(unsigned-byte 8))
(loop for i from 0 to 31 do
(setf (elt entropic-value i) (read-byte urandom-file))))
(let ((digest (ironclad:make-digest 'ironclad:sha256)))
(ironclad:update-digest digest entropic-value)
(ironclad:byte-array-to-hex-string (ironclad:produce-digest digest)))))
(defun populate-webapps ()
(with-open-file (input *conf-file* :direction :input)
(let ((form (read input)))
(set-webapp (make-instance 'webapp
:name (getf form :name)
:document-root (make-webapp-path (getf form :document-root))
:title (getf form :title)
:meta-description (getf form :meta-description)
:proxy (getf form :proxy)
:dns (getf form :dns))))))
(defun read-creds-file ()
"Reads the data stored in the credentials file at location
`*creds-file*'."
(when (probe-file *creds-file*)
(with-open-file (input *creds-file* :direction :input)
(read input))))
(defun dns-admin ()
"Call this to start the server."
(when (null *acceptor*)
(let ((package (string-downcase (package-name #.*package*))))
(populate-webapps)
(setf (log-manager) (make-instance 'log-manager :message-class 'formatted-message))
(start-messenger 'text-file-messenger :filename (format nil "/var/log/lisp/~a.log" package))
(setf *session-secret* (generate-sessionid))
(populate-webapps)
(setf *acceptor* (start (make-instance 'easy-acceptor
:port *port*
:document-root (make-server-path (format nil "webapps/~a/" package))
:name (format nil "~a-acceptor" package)))))))
(defmacro with-request-wrapper (uri page-function &rest args)
(let ((package (string-downcase (package-name #.*package*))))
`(let ((*webapp* (get-webapp ,package)))
(logger (format nil "Page request URI: [~a]" ,uri))
(multiple-value-bind (basic-auth-username basic-auth-pwd)
(hunchentoot:authorization)
(if (or (null-or-empty-p basic-auth-username)
(null-or-empty-p basic-auth-pwd))
(hunchentoot:require-authorization (name *webapp*))
(progn
(unless *session*
(start-session)
(setf (session-max-time *session*) *session-timeout*)
(setf (session-value :username) basic-auth-username)
(setf (session-value :pwd) basic-auth-pwd)
(let ((creds (read-creds-file)))
(loop while creds do
(let ((key (pop creds))
(val (pop creds)))
(setf (session-value key *session*) val)))))
(,page-function ,@args)))))))
(defmacro define-endpoint (request-type uri var-list page-function &rest args)
"Does the grunt work of creating an `easy-handler' for each page you
wish to publish."
(let ((name (gensym)))
`(progn
(logger (format nil "Publishing page. URL = [~a]" ,uri))
(define-easy-handler (,name :uri ,uri :default-request-type ,request-type)
,var-list
(with-request-wrapper ,uri ,page-function ,@args)))))
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