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clath.lisp
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clath.lisp
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(in-package :clath)
#|
FIXME: Stuff in this file will need to be rethought when a more general
login manager is developed.
|#
(defparameter *clath-app-address* "clath/")
(defparameter *logout-extension* "logout/")
(defun login-app (base-url app-address)
;;FIXME: Doesn't work first time this is called.
(initialize-secrets)
(let ((app (make-instance 'ningle:<app>)))
(dolist (pr (available-providers))
(let ((name (provider-url-string pr)))
(if (uses-north-p pr)
(progn
(setf (ningle:route
app (concatenate 'string "/" *login-extension-north* name)
:method :get)
(lambda (params)
(declare (ignore params))
(let ((*server-url* base-url)
(*clath-app-address* app-address))
(login-action-north pr))))
(setf (ningle:route
app
(concatenate 'string "/" *callback-extension-north* name)
:method :get)
(lambda (params)
(let ((*server-url* base-url)
(*clath-app-address* app-address))
(callback-action-north pr params #'logged-in)))))
(progn
(setf (ningle:route
app (concatenate 'string "/" *login-extension* name)
:method :get)
(lambda (params)
(declare (ignore params))
(let ((*server-url* base-url)
(*clath-app-address* app-address))
(login-action pr))))
(setf (ningle:route
app (concatenate 'string "/" *callback-extension* name)
:method :get)
(lambda (params)
(let ((*server-url* base-url)
(*clath-app-address* app-address))
(callback-action pr params #'logged-in))))))))
(setf (ningle:route app (concatenate 'string "/" *login-extension*)
:method :get)
(lambda (params)
(let ((*server-url* base-url)
(*clath-app-address* app-address))
(login-page params))))
(setf (ningle:route app (concatenate 'string "/" *logout-extension*)
:method :get)
(lambda (params)
(let ((*server-url* base-url)
(*clath-app-address* app-address))
(logout-page params))))
app))
(defun component (base-url &key (extension *clath-app-address*))
(lambda (app)
(let ((lapp (lack.component:to-app
(login-app (concatenate 'string base-url extension) extension))))
(lambda (env)
(let ((in-app
(under-path-p
(concatenate 'string "/" extension) (getf env :path-info))))
(if in-app
(funcall lapp (repath-clack-env env in-app))
(let* ((*clath-app-address* extension)
(res (funcall app env)))
(if (and (consp res) (eql 403 (car res)))
(not-logged-page env res)
res))))))))
(defun secrets-from-ubiquitous ()
(ubiquitous:restore 'clath)
(let ((providers (loop for (k . v) on *provider-info* by #'cddr collect k)))
(mapcan (lambda (pr)
(when (and (ubiquitous:value pr) (not (provider-disabled? pr)))
(list pr
(list* :client-id (ubiquitous:value pr :client-id)
:secret (ubiquitous:value pr :secret)
(when (ubiquitous:value pr :key)
(list :key (ubiquitous:value pr :key)))))))
providers)))
(defun initialize-secrets ()
(setf *provider-secrets* (secrets-from-ubiquitous))
t) ;;Don't dump the secrets to the console when called interactively
;;Run initialize-secrets to make an enable or disable come into effect
(defun disable-provider (pr)
(ubiquitous:restore 'clath)
(setf (ubiquitous:value pr :disabled) t))
(defun enable-provider (pr)
(ubiquitous:restore 'clath)
(ubiquitous:remvalue pr :disabled))
(defun provider-disabled? (pr)
(ubiquitous:restore 'clath)
(ubiquitous:value pr :disabled))
(defun login-links ()
(with-html-output-to-string (s)
(:div
(dolist (pr (available-providers))
(htm (:p (:a :href (make-login-url pr)
(format s "~:(~a~)" (provider-string pr)))))))))
(defun clath-page-wrapper (title body-func)
"Redefine this function to customize the look of all Clath pages."
(with-html-output-to-string (s)
(:html
(:head (:title title))
(:body (str (funcall body-func))))))
(defun clath-login-page ()
"Redefine this function to customize the login page."
(clath-page-wrapper "Login"
(lambda ()
(with-html-output-to-string (s)
(:h2 "Choose a login provider")
(str (login-links))))))
(defun login-page (params)
"Internal portion of clath-login-page"
(when-let ((dest (assoc "destination" params :test #'equal)))
(setf (gethash :clath-destination (ningle:context :session)) (cdr dest)))
(clath-login-page))
(defun clath-not-logged-page ()
"Redefine this function to customize the not-logged-in page."
(clath-page-wrapper "Please Log In"
(lambda ()
(with-html-output-to-string (s)
(:h1 "Not logged in")
(:h2 "Choose a login provider")
(str (login-links))))))
(defun not-logged-page (env result)
"Internal portion of clath-not-logged-page"
(setf (gethash :clath-destination (getf env :lack.session))
(url-from-env env))
;; Result is the 403 page that came back from down-stack. We want to preserve the headers
;; while swapping out the page body.
(list
(car result)
(second result)
(list
;; Generated page may have headers. If so, just take the page text.
(let ((page (clath-not-logged-page)))
(if (listp page)
(car (third page))
page)))))
(defun clath-logout-page ()
"Redefine this function to customize the logout page."
(clath-page-wrapper "Logged Out"
(lambda ()
(with-html-output-to-string (s)
(:h1 "Logged out")))))
(defvar *in-logout-page* nil
"For code that implements login links. Self destination links should not be used on the logout page, lest the user get stuck in an auto-logout loop. This variable will be set when the logout page is being generated.")
(defun logout-page (params)
(declare (ignore params))
(logout-action)
(logged-out)
(let ((*in-logout-page* t))
(clath-logout-page)))
(defun logout-url ()
(concatenate 'string "/" *clath-app-address* *logout-extension*))
(defun login-url ()
(concatenate 'string "/" *clath-app-address* *login-extension*))
;;FIXME: :username and :display-name extraction are getting really messy.
;; Should split out into different methods for providers.
(defun logged-in ()
(let* ((uinfo (gethash :clath-userinfo (ningle:context :session)))
(uname (userinfo-get-user-id t uinfo)))
(unless uname
(if-let ((msg (assoc-cdr :message uinfo)))
(error (format nil "Message from OAuth server: ~a" msg))
(error "Couldn't find user ID in OAuth return data.")))
(setf (gethash :username (ningle:context :session))
(format nil "~a@~a" uname
(string-downcase
(gethash :clath-provider (ningle:context :session)))))
(setf (gethash :display-name (ningle:context :session))
(or (cdr (assoc-or
'(:preferred--username :nickname :login :name :display--name
:given--name :email)
uinfo))
(format nil "~a ~a"
(assoc-cdr :first-name uinfo)
(assoc-cdr :last-name uinfo))))))
(defun logged-out ()
(remhash :username (ningle:context :session))
(remhash :display-name (ningle:context :session)))