Provided by: libeliom-ocaml-doc_3.0.3-4build2_all 
NAME
Eliom_openid - OpenID identification
Module
Module Eliom_openid
Documentation
Module Eliom_openid
: sig end
OpenID identification
=== This module implements the Relying Party of the OpenID specification, in stateful
mode. ===
=== Library description ===
=== The library provides means to authenticate an user to a remote provider using the
OpenID protocol. Basically, you need to ask the user its OpenID url, and the fields you
want to require (or none, if you just want to authenticate an user), along with other
information. The library uses an hidden service that is needed when the provider
redirects back to your site. This service is registered in the library, all you have to do
is to give a path for that service and a default handler (if the user connects to that
service without being in an authentication process.) Here is a short example of how to
use the library open Eliom_openid let messages = Eliom_state.create_volatile_table () (*
The login form *) let login_form = Eliom_service.new_service ~path:["login-form"]
~get_params: Eliom_parameter.unit () (* Initialize the library, and getting the
authenticate function *) let authenticate = Eliom_openid.init
~path:["__openid_return_service"] ~f: (fun _ _ -> Eliom_registration.Redirection.send
login_form) (* Create the handler for the form *) (* We have to use
Eliom_registration.String_redirection as we redirect the user to her provider *) let
form_handler = Eliom_registration.String_redirection.register_new_post_coservice
~fallback: login_form ~post_params: (Eliom_parameter.string url ) (fun _ url ->
authenticate ~max_auth_age: 4 (* Requires that if the user logged in more that 4 seconds
ago he needs to relog in *) ~required: [Eliom_openid.Email] (* Requires his e-mail *)
~immediate: false url (fun result -> let string = match result with | Setup_needed ->
setup needed | Canceled -> canceled | Result result -> try List.assoc Email result.fields
with Not_found -> No e-mail :( in Eliom_state.set_volatile_session_data ~table:messages
string; Eliom_registration.Redirection.send login_form)) open XHTML let _ =
Eliom_registration.Xhtml.register ~service: login_form (fun _ _ -> (match
Eliom_state.get_volatile_session_data ~table: messages () with | Eliom_state.Data s ->
Eliom_state.discard () >>= fun () -> Lwt.return [p [pcdata ("Authentication result: ^ s)]]
| _ -> Lwt.return []) >>= fun message -> let form = Eliom_registration.Xhtml.post_form
~service:form_handler (fun url -> [p [pcdata Your OpenID identifier: ;
Eliom_registration.Xhtml.string_input ~input_type:`Text ~name:url ();
Eliom_registration.Xhtml.string_input ~input_type:`Submit ~value:"Login" (); ]]) () in
Lwt.return (html (head (title (pcdata A sample test )) []) (body (message @ [form])))) ===
=== Documentation ===
=== Miscallenous ===
type openid_error =
| Invalid_XRDS_File of string * string (* The provider XRDS file was not valid *)
| Discovery_Error of string * string (* An error occured during the discovery of the
provider *)
| Missing_parameter of string (* The remote server forgot a parameter in its request *)
| Invalid_signature of string * string (* We disagree with the server's signature *)
| Invalid_association of string (* We were unable to associate with a provider *)
| Invalid_argument of string * string * string (* The argument provided were not set to
a correct value *)
| Server_error of string (* The server threw an explicit error *)
| Invalid_answer of string (* The answer code was not correct *)
| Invalid_html_doc of string
Error that may happen when identifiying an user
=== An error occured during the parsing of an user url in html format ===
val string_of_openid_error : openid_error -> string
Prettyprint an OpenID Error
exception Error of openid_error
Exception thrown by this module's function.
type field =
| Email
| Fullname
| DateOfBirth
| PostCode
| Timezone
| Language
| Country
| Gender
| Nickname
A field you can request to the provider
type 'a extension = {
headers : (string * string) list ;
parse : (string * string) list -> 'a Lwt.t ;
}
An extension yielding values of type 'a
val sreg : ?policy_url:string -> required:field list -> optional:field list -> unit ->
(field * string) list extension
The SREG extension
See also SREG
val ax : required:field list -> optional:field list -> unit -> (field * string) list
extension
The AX extension
See also AX
type pape = {
auth_time : string option ; (* The time at which the user last logged in *)
policies : string list option ; (* A list of policies (url) describing your usage of the
data *)
nist_level : int option ;
}
The pape data returned by the server
val pape : ?max_auth_age:int -> ?auth_policies:string list -> unit -> pape extension
The nist level
val ( *** ) : 'a extension -> 'b extension -> ('a * 'b) extension
The PAPE extension.
See also PAPE
=== Product of two extension ===
type 'a authentication_result =
| Canceled (* The user canceled the login (or failed) *)
| Setup_needed (* The provider has not enough information to complete an immediate
request. Only returned when using an immediate authentication. *)
| Result of 'a
The result of an authentication.
=== All went ok. ===
=== Low-level interface. ===
val perform_discovery : string -> (string * string option) Lwt.t
Perform discovery on an user-supplied url
module type HiddenServiceInfo = sig end
Information about the hidden service
=== The function called when an user connects to the hidden service (not that hidden)
without being in an identication process. Typically you should redirect the user to the
login page. ===
module Make : functor (S : HiddenServiceInfo) -> sig end
This functor build a hidden service that will be used to receive the remote server's data.
In return you get a check function
=== Authenticate an user. - mode: can be checkid_setup or checkid_immediate whether you
want immediate identification or not. - ext: the extensions you want to use. - handler:
the handler called with the result of the authentication. - discovery: The discovery
information In return you get an URI you have to redirect the user to. ===
=== High-level interface ===
=== The high-level interface takes care of creating the extension you want, without to use
them directly. It yields a result. ===
type result = {
fields : (field * string) list ; (* The fields you requested *)
pape : pape ;
}
The result yielded by the authentication process
=== The pape information ===
type check_fun = ?immediate:bool -> ?policy_url:string -> ?max_auth_age:int ->
?auth_policies:string list -> ?required:field list -> ?optional:field list -> string ->
(result authentication_result -> (Eliom_registration.browser_content,
Eliom_registration.http_service) Eliom_registration.kind Lwt.t) -> Eliom_lib.Url.t Lwt.t
The type of the authenticate function.
-immediate: whether to use immediate identification or not (default: true)
-policy_url: an optional policy url to describe what you do with the data (sreg)
(default:none)
-required: optional fields you really need (although the provier may not provide them)
(default:empty)
-optional: optional fields you don't really need (default: empty)
-max_auth_age: Requires that the user logged in less than n seconds ago. (default: up to
the provider)
-auth_policies: A list of url describing your policies regarding the data (default: empty)
-the url the user gave you
-an handler, that'll be called after checking the parameters with the result and the
server params of the GET request. You can send whatever page you want but you should
redirect the user to a page so he can't bookmark it, or send some piece of html to
interface with javascript.
val init : path:string list -> f:((string * string) list -> unit ->
(Eliom_registration.browser_content, Eliom_registration.http_service)
Eliom_registration.kind Lwt.t) -> check_fun
Init the OpenID for your site. Takes a path and a handler for the hidden service