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(**************************************************************************)
(*                                BELENIOS                                *)
(*                                                                        *)
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(*  Copyright © 2012-2014 Inria                                           *)
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(*                                                                        *)
(*  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, with the additional   *)
(*  exemption that compiling, linking, and/or using OpenSSL is allowed.   *)
(*                                                                        *)
(*  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                         *)
(*  <http://www.gnu.org/licenses/>.                                       *)
(**************************************************************************)

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open Lwt
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open Platform
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open Serializable_j
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open Signatures
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open Common
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open Web_serializable_j
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open Web_common
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open Web_signatures
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open Web_services
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let source_file = ref "belenios.tar.gz"
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let get_single_line x =
  match_lwt Lwt_stream.get x with
  | None -> return None
  | Some _ as line ->
    lwt b = Lwt_stream.is_empty x in
    if b then (
      return line
    ) else (
      Lwt_stream.junk_while (fun _ -> true) x >>
      return None
    )

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let ( / ) = Filename.concat

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let delete_shallow_directory dir =
  lwt () =
    Lwt_unix.files_of_directory dir |>
    Lwt_stream.filter (fun x -> x <> "." && x <> "..") |>
    Lwt_stream.iter_s (fun x -> Lwt_unix.unlink (dir/x))
  in
  Lwt_unix.rmdir dir

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module PString = String
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open Eliom_service
open Eliom_registration

module LwtRandom = MakeLwtRandom (struct let rng = make_rng () end)

(* Persistent table, used to initialize the server. *)
let election_ptable = Ocsipersist.open_table "site_elections"

(* Table with elections in setup mode. *)
let election_stable = Ocsipersist.open_table "site_setup"

(* Table with tokens given to trustees. *)
let election_pktokens = Ocsipersist.open_table "site_pktokens"

(* Table with tokens given to credential authorities. *)
let election_credtokens = Ocsipersist.open_table "site_credtokens"

module T = Web_templates

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let web_election_data (raw_election, web_params) =
  let params = Group.election_params_of_string raw_election in
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  let module D = struct
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    include (val params : ELECTION_DATA)
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    include (val web_params : WEB_PARAMS)
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  end in
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  (module D : WEB_ELECTION_DATA)

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let raw_find_election uuid =
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  lwt raw_election = Web_persist.get_raw_election uuid in
  lwt metadata = Web_persist.get_election_metadata uuid in
  match raw_election, metadata with
  | Some raw_election, Some metadata ->
     let module P = struct
       let dir = !spool_dir / uuid
       let metadata = metadata
     end in
     let web_params = (module P : WEB_PARAMS) in
     return (web_election_data (raw_election, web_params))
  | _, _ -> Lwt.fail Not_found
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module WCacheTypes = struct
  type key = string
  type value = (module WEB_ELECTION_DATA)
end

module WCache = Ocsigen_cache.Make (WCacheTypes)

let find_election =
  let cache = new WCache.cache raw_find_election 100 in
  fun x -> cache#find x

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let dump_passwords dir table uuid =
  Lwt_io.(with_file Output (dir / "passwords.csv") (fun oc ->
    Ocsipersist.iter_step (fun voter (salt, hashed) ->
      write_line oc (voter ^ "," ^ salt ^ "," ^ hashed)
    ) table
  ))

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(* Mutex to avoid simultaneous registrations of the same election *)
let registration_mutex = Lwt_mutex.create ()

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let import_election f =
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  Lwt_mutex.lock registration_mutex >>
  try_lwt
    lwt raw_election =
      Lwt_io.lines_of_file f.f_election |>
      get_single_line >>=
      (function
      | Some e -> return e
      | None -> Printf.ksprintf
        failwith "election.json must contain a single line"
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      )
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    in
    let params = Group.election_params_of_string raw_election in
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    let module P = (val params : ELECTION_DATA) in
    let uuid = Uuidm.to_string P.election.e_params.e_uuid in
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    lwt exists =
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      lwt x = Web_persist.get_raw_election uuid in
      match x with
      | Some _ -> return true
      | None -> return false
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    in
    if exists then (
      Lwt_mutex.unlock registration_mutex;
      return None
    ) else (
      let dir = !spool_dir/uuid in
      lwt metadata =
        Lwt_io.chars_of_file f.f_metadata |>
        Lwt_stream.to_string >>=
        wrap1 metadata_of_string
      in
      let module X = struct
        let metadata = metadata
        let dir = dir
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      end in
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      let web_params = (module X : WEB_PARAMS) in
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      let module G = P.G in
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      let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
      let public_keys = Lwt_io.lines_of_file f.f_public_keys in
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      let voters = Lwt_io.lines_of_file f.f_voters in
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      lwt () =
        match_lwt Lwt_stream.peek voters with
        | Some _ -> return_unit
        | None -> Lwt.fail (Failure "No voters")
      in
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      lwt () =
        match metadata.e_auth_config with
        | Some [x] ->
           if x.auth_system = "password" then
             let table = "password_" ^ underscorize uuid in
             let table = Ocsipersist.open_table table in
             lwt n = Ocsipersist.length table in
             if n = 0 then Lwt.fail (Failure "No passwords")
             else return_unit
           else return_unit
        | _ -> return_unit
      in
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      lwt pks = Lwt_stream.(
        clone public_keys |>
        map (trustee_public_key_of_string G.read) |>
        to_list >>= wrap1 Array.of_list
      ) in
      if not (Array.forall KG.check pks) then
        failwith "Public keys are invalid.";
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      if not G.(P.election.e_params.e_public_key =~ KG.combine pks) then
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        failwith "Public keys mismatch with election public key.";
      let public_creds = Lwt_io.lines_of_file f.f_public_creds in
      lwt () = Lwt_stream.(
        clone public_creds |>
        iter_s (fun x ->
          if not G.(check @@ of_string x) then (
            Lwt.fail @@ Failure "Public credentials are invalid."
          ) else return ()
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        )
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      ) in
      let module R = struct
        let register () =
          try_lwt
            Lwt_unix.mkdir dir 0o700 >>
            Lwt_io.(with_file Output (dir/"election.json") (fun oc ->
              write_line oc raw_election
            )) >>
            Lwt_io.(with_file Output (dir/"public_keys.jsons") (fun oc ->
              write_lines oc public_keys
            )) >>
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            Lwt_io.(with_file Output (dir/"voters.txt") (fun oc ->
              write_lines oc voters
            )) >>
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            Lwt_io.(with_file Output (dir/"metadata.json") (fun oc ->
              write_line oc (string_of_metadata metadata)
            )) >>
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            let election = web_election_data (raw_election, web_params) in
            let module W = Web_election.Make ((val election)) (LwtRandom) in
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            lwt () =
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              match W.D.metadata.e_auth_config with
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              | None -> return ()
              | Some xs ->
                 let auth_config =
                   List.map (fun {auth_system; auth_instance; auth_config} ->
                     auth_instance, (auth_system, List.map snd auth_config)
                   ) xs
                 in
                 Web_persist.set_auth_config uuid auth_config
            in
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            let () =
              Ocsigen_messages.debug (fun () ->
                Printf.sprintf "Injecting credentials for %s" uuid
              )
            in
            public_creds |>
            Lwt_stream.iter_s W.B.inject_cred >>
            W.B.update_files () >>
            Ocsipersist.add election_ptable uuid (raw_election, web_params) >>
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            (
              let table = "password_" ^ underscorize uuid in
              let table = Ocsipersist.open_table table in
              lwt size = Ocsipersist.length table in
              if size > 0 then dump_passwords dir table uuid else return_unit
            ) >>
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            let () = Lwt_mutex.unlock registration_mutex in
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            return (module W : WEB_ELECTION)
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          with e ->
            lwt () =
              try_lwt delete_shallow_directory dir
              with e ->
                Printf.ksprintf
                  (fun s ->
                   return (Ocsigen_messages.unexpected_exception e s))
                  "error while deleting %s after failure of %s"
                  dir uuid
            in
            Lwt_mutex.unlock registration_mutex;
            Lwt.fail e
      end in
      (* until here, no side-effects on the running server *)
      return @@ Some (module R : REGISTRABLE_ELECTION)
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    )
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  with e ->
    Lwt_mutex.unlock registration_mutex;
    Lwt.fail e

let () = Any.register ~service:home
  (fun () () ->
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    Eliom_reference.unset Web_auth_state.cont >>
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    T.home () >>= Html5.send
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  )

let () = Html5.register ~service:admin
  (fun () () ->
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    let cont () = Redirection.send admin in
    Eliom_reference.set Web_auth_state.cont [cont] >>
    lwt site_user = Web_auth_state.get_site_user () in
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    lwt elections =
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      match site_user with
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      | None -> return None
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      | Some u ->
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         lwt elections, tallied =
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           Web_persist.get_elections_by_owner u >>=
           Lwt_list.fold_left_s (fun accu uuid_s ->
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               lwt w = find_election uuid_s in
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               lwt state = Web_persist.get_election_state uuid_s in
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               lwt date = Web_persist.get_election_date uuid_s in
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               let elections, tallied = accu in
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               match state with
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               | `Tallied _ -> return (elections, (date, w) :: tallied)
               | _ -> return ((date, w) :: elections, tallied)
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           ) ([], [])
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         and setup_elections =
           Ocsipersist.fold_step (fun k v accu ->
             if v.se_owner = u
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             then return ((uuid_of_string k, v.se_questions.t_name) :: accu)
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             else return accu
           ) election_stable []
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         in
         let sort l =
           List.sort (fun (x, _) (y, _) -> datetime_compare x y) l |>
           List.map (fun (_, x) -> x)
         in
         let elections = sort elections and tallied = sort tallied in
         return @@ Some (elections, tallied, setup_elections)
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    in
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    T.admin ~elections ()
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  )

let () = File.register
  ~service:source_code
  ~content_type:"application/x-gzip"
  (fun () () -> return !source_file)

let do_get_randomness =
  let prng = Lazy.lazy_from_fun (Lwt_preemptive.detach (fun () ->
    pseudo_rng (random_string secure_rng 16)
  )) in
  let mutex = Lwt_mutex.create () in
  fun () ->
    Lwt_mutex.with_lock mutex (fun () ->
      lwt prng = Lazy.force prng in
      return (random_string prng 32)
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    )

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let () = String.register
  ~service:get_randomness
  (fun () () ->
    lwt r = do_get_randomness () in
    b64_encode_compact r |>
    (fun x -> string_of_randomness { randomness=x }) |>
    (fun x -> return (x, "application/json"))
  )

let generate_uuid = Uuidm.v4_gen (Random.State.make_self_init ())

let () = Redirection.register ~service:election_setup_new
  (fun () () ->
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   match_lwt Web_auth_state.get_site_user () with
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   | Some u ->
      let uuid = generate_uuid () in
      let uuid_s = Uuidm.to_string uuid in
      lwt token = generate_token () in
      let se_metadata = {
        e_owner = Some u;
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        e_auth_config = Some [{auth_system = "password"; auth_instance = "password"; auth_config = []}];
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        e_cred_authority = None;
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      } in
      let question = {
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        q_answers = [| "Answer 1"; "Answer 2"; "Blank" |];
        q_min = 1;
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        q_max = 1;
        q_question = "Question 1?";
      } in
      let se_questions = {
        t_description = "Description of the election.";
        t_name = "Name of the election";
        t_questions = [| question |];
        t_short_name = "short_name";
      } in
      let se = {
        se_owner = u;
        se_group = "{\"g\":\"14887492224963187634282421537186040801304008017743492304481737382571933937568724473847106029915040150784031882206090286938661464458896494215273989547889201144857352611058572236578734319505128042602372864570426550855201448111746579871811249114781674309062693442442368697449970648232621880001709535143047913661432883287150003429802392229361583608686643243349727791976247247948618930423866180410558458272606627111270040091203073580238905303994472202930783207472394578498507764703191288249547659899997131166130259700604433891232298182348403175947450284433411265966789131024573629546048637848902243503970966798589660808533\",\"p\":\"16328632084933010002384055033805457329601614771185955389739167309086214800406465799038583634953752941675645562182498120750264980492381375579367675648771293800310370964745767014243638518442553823973482995267304044326777047662957480269391322789378384619428596446446984694306187644767462460965622580087564339212631775817895958409016676398975671266179637898557687317076177218843233150695157881061257053019133078545928983562221396313169622475509818442661047018436264806901023966236718367204710755935899013750306107738002364137917426595737403871114187750804346564731250609196846638183903982387884578266136503697493474682071\",\"q\":\"61329566248342901292543872769978950870633559608669337131139375508370458778917\"}";
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        se_voters = [];
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        se_questions;
        se_public_keys = [];
        se_metadata;
        se_public_creds = token;
      } in
      lwt () = Ocsipersist.add election_stable uuid_s se in
      lwt () = Ocsipersist.add election_credtokens token uuid_s in
      return (preapply election_setup uuid)
  | None -> forbidden ()
  )

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let generic_setup_page f uuid () =
  match_lwt Web_auth_state.get_site_user () with
  | Some u ->
     let uuid_s = Uuidm.to_string uuid in
     lwt se = Ocsipersist.find election_stable uuid_s in
     if se.se_owner = u
     then f uuid se ()
     else forbidden ()
  | None -> forbidden ()

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let () = Html5.register ~service:election_setup
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  (generic_setup_page T.election_setup)
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let () = Html5.register ~service:election_setup_trustees
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  (generic_setup_page T.election_setup_trustees)

let () = Html5.register ~service:election_setup_credential_authority
  (generic_setup_page T.election_setup_credential_authority)
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let election_setup_mutex = Lwt_mutex.create ()

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let handle_setup f uuid x =
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  match_lwt Web_auth_state.get_site_user () with
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  | Some u ->
     let uuid_s = Uuidm.to_string uuid in
     Lwt_mutex.with_lock election_setup_mutex (fun () ->
       lwt se = Ocsipersist.find election_stable uuid_s in
       if se.se_owner = u then (
         try_lwt
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           lwt cont = f se x u uuid in
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           Ocsipersist.add election_stable uuid_s se >>
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           cont ()
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         with e ->
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           T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
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       ) else forbidden ()
     )
  | None -> forbidden ()
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let redir_preapply s u () = Redirection.send (preapply s u)

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let () =
  Any.register
    ~service:election_setup_description
    (handle_setup
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       (fun se (name, description) _ uuid ->
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         se.se_questions <- {se.se_questions with
           t_name = name;
           t_description = description;
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         };
         return (redir_preapply election_setup uuid)))
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let () =
  Any.register
    ~service:election_setup_group
    (handle_setup
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       (fun se x _ uuid ->
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        let _group = Group.of_string x in
        (* we keep it as a string since it contains a type *)
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        se.se_group <- x;
        return (redir_preapply election_setup uuid)))
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let () =
  Any.register
    ~service:election_setup_metadata
    (handle_setup
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       (fun se x u uuid ->
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        let metadata = metadata_of_string x in
        if metadata.e_owner <> Some u then failwith "wrong owner";
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        se.se_metadata <- metadata;
        return (redir_preapply election_setup uuid)))
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let () =
  Any.register
    ~service:election_setup_auth
    (handle_setup
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       (fun se auth_system _ uuid ->
         (match auth_system with
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         | Some (("dummy" | "password") as auth_system) ->
            se.se_metadata <- {
              se.se_metadata with
                e_auth_config = Some [{
                  auth_system;
                  auth_instance = auth_system;
                  auth_config = []
                }]
            }
         | Some "cas" ->
            se.se_metadata <- {
              se.se_metadata with
                e_auth_config = Some [{
                  auth_system = "cas";
                  auth_instance = "cas";
                  auth_config = ["server", ""];
                }]
            }
         | Some x -> failwith ("unknown authentication system: "^x)
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         | None -> failwith "no authentication system was given");
         return (redir_preapply election_setup uuid)))
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let () =
  Any.register
    ~service:election_setup_auth_cas
    (handle_setup
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       (fun se server _ uuid ->
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         se.se_metadata <- {
           se.se_metadata with
             e_auth_config = Some [{
               auth_system = "cas";
               auth_instance = "cas";
               auth_config = ["server", server];
             }]
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         };
         return (redir_preapply election_setup uuid)))
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let template_password = format_of_string
  "You are listed as a voter for the election

  %s

You will find below your login and password.  To cast a vote, you will
also need a credential, sent in a separate email.  Be careful,
passwords and credentials look similar but play different roles.  You
will be asked to enter your credential before entering the voting
booth.  Login and passwords are required once your ballot is ready to
be cast.

Username: %s
Password: %s
Page of the election: %s

Note that you are allowed to vote several times.  Only the last vote
counts.

-- 
Belenios"

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let generate_password table title url v =
  lwt salt = generate_token () in
  lwt password = generate_token () in
  let hashed = sha256_hex (salt ^ password) in
  lwt () = Ocsipersist.add table v (salt, hashed) in
  let body = Printf.sprintf template_password title v password url in
  let subject = "Your password for election " ^ title in
  send_email "noreply@belenios.org" v subject body

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let () =
  Any.register
    ~service:election_setup_auth_genpwd
    (handle_setup
       (fun se () _ uuid ->
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         let uuid_s = Uuidm.to_string uuid in
         let table = "password_" ^ underscorize uuid_s in
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         let title = se.se_questions.t_name in
         let url = Eliom_uri.make_string_uri
           ~absolute:true ~service:election_home
           (uuid, ()) |> rewrite_prefix
         in
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         let table = Ocsipersist.open_table table in
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         Lwt_list.iter_s (generate_password table title url) se.se_voters >>
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         return (fun () ->
           T.generic_page ~title:"Success"
             "Passwords have been generated and mailed!" () >>= Html5.send)))
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let () =
  Any.register
    ~service:election_regenpwd
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    (fun (uuid, ()) user ->
      T.regenpwd uuid () >>= Html5.send)

let () =
  Any.register
    ~service:election_regenpwd_post
    (fun (uuid, ()) user ->
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      let uuid_s = Uuidm.to_string uuid in
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      lwt w = find_election uuid_s in
      let module W = (val w) in
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      lwt site_user = Web_auth_state.get_site_user () in
      match site_user with
      | Some u when W.metadata.e_owner = Some u ->
         let table = "password_" ^ underscorize uuid_s in
         let table = Ocsipersist.open_table table in
         let title = W.election.e_params.e_name in
         let url = Eliom_uri.make_string_uri
           ~absolute:true ~service:election_home
           (uuid, ()) |> rewrite_prefix
         in
         begin try_lwt
           lwt _ = Ocsipersist.find table user in
           generate_password table title url user >>
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           dump_passwords W.dir table uuid_s >>
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           T.generic_page ~title:"Success"
             ("A new password has been mailed to " ^ user ^ ".") ()
           >>= Html5.send
         with Not_found ->
           T.generic_page ~title:"Error"
             (user ^ " is not a registered user for this election.") ()
           >>= Html5.send
         end
      | _ -> forbidden ()
    )

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let () =
  Html5.register
    ~service:election_setup_questions
    (fun uuid () ->
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     match_lwt Web_auth_state.get_site_user () with
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     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
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        lwt se = Ocsipersist.find election_stable uuid_s in
        if se.se_owner = u
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        then T.election_setup_questions uuid se ()
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        else forbidden ()
     | None -> forbidden ()
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    )

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let () =
  Any.register
    ~service:election_setup_questions_post
    (handle_setup
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       (fun se x _ uuid ->
        se.se_questions <- template_of_string x;
         return (redir_preapply election_setup_questions uuid)))
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let () =
  Html5.register
    ~service:election_setup_voters
    (fun uuid () ->
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      match_lwt Web_auth_state.get_site_user () with
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      | Some u ->
         let uuid_s = Uuidm.to_string uuid in
         lwt se = Ocsipersist.find election_stable uuid_s in
         if se.se_owner = u
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         then T.election_setup_voters uuid se ()
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         else forbidden ()
      | None -> forbidden ()
    )

(* see http://www.regular-expressions.info/email.html *)
let email_rex = Pcre.regexp
  ~flags:[`CASELESS]
  "^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,7}$"

let is_email x =
  try ignore (Pcre.pcre_exec ~rex:email_rex x); true
  with Not_found -> false

let () =
  Any.register
    ~service:election_setup_voters_post
    (handle_setup
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       (fun se x _ uuid ->
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         let xs = Pcre.split x in
         let () =
           try
             let bad = List.find (fun x -> not (is_email x)) xs in
             Printf.ksprintf failwith "%S is not a valid address" bad
           with Not_found -> ()
         in
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         se.se_voters <- xs;
         return (redir_preapply election_setup uuid)))
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let () =
  Redirection.register
    ~service:election_setup_trustee_add
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    (fun uuid () ->
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     match_lwt Web_auth_state.get_site_user () with
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     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
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        Lwt_mutex.with_lock election_setup_mutex (fun () ->
          lwt se = Ocsipersist.find election_stable uuid_s in
          if se.se_owner = u
          then (
            lwt token = generate_token () in
            se.se_public_keys <- (token, ref "") :: se.se_public_keys;
            Ocsipersist.add election_stable uuid_s se >>
            Ocsipersist.add election_pktokens token uuid_s
          ) else forbidden ()
        ) >>
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        return (preapply election_setup_trustees uuid)
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     | None -> forbidden ()
    )

let () =
  Redirection.register
    ~service:election_setup_trustee_del
    (fun uuid () ->
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     match_lwt Web_auth_state.get_site_user () with
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     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
        Lwt_mutex.with_lock election_setup_mutex (fun () ->
          lwt se = Ocsipersist.find election_stable uuid_s in
          if se.se_owner = u
          then (
            match se.se_public_keys with
            | (token, _) :: xs ->
               se.se_public_keys <- xs;
               Ocsipersist.add election_stable uuid_s se >>
               Ocsipersist.remove election_pktokens token
            | _ -> return ()
          ) else forbidden ()
        ) >>
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        return (preapply election_setup_trustees uuid)
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     | None -> forbidden ()
    )

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let () =
  Html5.register
    ~service:election_setup_credentials
    (fun token () ->
     lwt uuid = Ocsipersist.find election_credtokens token in
     lwt se = Ocsipersist.find election_stable uuid in
     T.election_setup_credentials token uuid se ()
    )
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let () =
  File.register
    ~service:election_setup_credentials_download
    ~content_type:"text/plain"
    (fun token () ->
     lwt uuid = Ocsipersist.find election_credtokens token in
     return (!spool_dir / uuid ^ ".public_creds.txt")
    )
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let wrap_handler f =
  try_lwt f ()
  with
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  | e -> T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
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let handle_credentials_post token creds =
  lwt uuid = Ocsipersist.find election_credtokens token in
  lwt se = Ocsipersist.find election_stable uuid in
  let module G = (val Group.of_string se.se_group : GROUP) in
  let fname = !spool_dir / uuid ^ ".public_creds.txt" in
  Lwt_mutex.with_lock
    election_setup_mutex
    (fun () ->
     Lwt_io.with_file
       ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
       ~perm:0o600 ~mode:Lwt_io.Output fname
       (fun oc -> Lwt_io.write_chars oc creds)
    ) >>
  lwt () =
    let i = ref 1 in
    Lwt_stream.iter
      (fun x ->
       try
         let x = G.of_string x in
         if not (G.check x) then raise Exit;
         incr i
       with _ ->
         Printf.ksprintf failwith "invalid credential at line %d" !i)
      (Lwt_io.lines_of_file fname)
  in
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  let () = se.se_metadata <- {se.se_metadata with e_cred_authority = None} in
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  T.generic_page ~title:"Success"
    "Credentials have been received and checked!" () >>= Html5.send
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let () =
  Any.register
    ~service:election_setup_credentials_post
    (fun token creds ->
     let s = Lwt_stream.of_string creds in
     wrap_handler (fun () -> handle_credentials_post token s))
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let () =
  Any.register
    ~service:election_setup_credentials_post_file
    (fun token creds ->
     let s = Lwt_io.chars_of_file creds.Ocsigen_extensions.tmp_filename in
     wrap_handler (fun () -> handle_credentials_post token s))

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module Credgen = struct
  module String = PString

  (* FIXME: duplicate of Tool_credgen *)

  let get_random_char =
    let prng = Lazy.lazy_from_fun (Lwt_preemptive.detach (fun () ->
      pseudo_rng (random_string secure_rng 16)
    )) in
    let mutex = Lwt_mutex.create () in
    fun () ->
      Lwt_mutex.with_lock mutex (fun () ->
        lwt prng = Lazy.force prng in
        let s = random_string prng 1 in
        return @@ s.[0]
      )

  (* Beware: the following must be changed in accordance with the booth! *)
  let digits = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
  let token_length = 14
  let n58 = Z.of_int 58
  let n53 = Z.of_int 53

  let generate_raw_token () =
    let res = String.create token_length in
    let rec loop i accu =
      if i < token_length then (
        lwt digit = get_random_char () in
        let digit = int_of_char digit mod 58 in
        res.[i] <- digits.[digit];
        loop (i+1) Z.(n58 * accu + of_int digit)
      ) else return (res, accu)
    in loop 0 Z.zero

  let add_checksum (raw, value) =
    let checksum = 53 - Z.(to_int (value mod n53)) in
    return (raw ^ String.make 1 digits.[checksum])

  let generate () =
    generate_raw_token () >>= add_checksum

end

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let template_credential = format_of_string
  "You are listed as a voter for the election

  %s

You will find below your login and credential.  To cast a vote, you will
also need a password, sent in a separate email.  Be careful,
passwords and credentials look similar but play different roles.  You
will be asked to enter your credential before entering the voting
booth.  Login and passwords are required once your ballot is ready to
be cast.

Username: %s
Credential: %s
Page of the election: %s

Note that you are allowed to vote several times.  Only the last vote
counts.

-- 
Belenios"

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let () =
  Any.register
    ~service:election_setup_credentials_server
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    (handle_setup (fun se () _ uuid ->
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      let () = se.se_metadata <- {se.se_metadata with
        e_cred_authority = Some "server"
      } in
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      let uuid_s = Uuidm.to_string uuid in
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      let title = se.se_questions.t_name in
      let url = Eliom_uri.make_string_uri
        ~absolute:true ~service:election_home
        (uuid, ()) |> rewrite_prefix
      in
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      lwt se = Ocsipersist.find election_stable uuid_s in
      let module S = Set.Make (PString) in
      let module G = (val Group.of_string se.se_group : GROUP) in
      lwt creds =
        Lwt_list.fold_left_s (fun accu id ->
          lwt cred = Credgen.generate () in
          let priv_cred = derive_cred uuid cred in
          let pub_cred =
            let x = Z.(of_string_base 16 priv_cred mod G.q) in
            let y = G.(g **~ x) in
            G.to_string y
          in
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          let body = Printf.sprintf template_credential title id cred url in
          let subject = "Your credential for election " ^ title in
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          lwt () = send_email "noreply@belenios.org" id subject body in
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          return @@ S.add pub_cred accu
        ) S.empty se.se_voters
      in
      let creds = S.elements creds in
      let fname = !spool_dir / uuid_s ^ ".public_creds.txt" in
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      lwt () =
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          Lwt_io.with_file
            ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
            ~perm:0o600 ~mode:Lwt_io.Output fname
            (fun oc ->
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              Lwt_list.iter_s (Lwt_io.write_line oc) creds)
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      in
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      return (fun () ->
        T.generic_page ~title:"Success"
          "Credentials have been generated and mailed!" () >>= Html5.send)))
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let () =
  Html5.register
    ~service:election_setup_trustee
    (fun token () ->
     lwt uuid = Ocsipersist.find election_pktokens token in
     lwt se = Ocsipersist.find election_stable uuid in
     T.election_setup_trustee token uuid se ()
    )

let () =
  Any.register
    ~service:election_setup_trustee_post
    (fun token public_key ->
     wrap_handler
       (fun () ->
        lwt uuid = Ocsipersist.find election_pktokens token in
        Lwt_mutex.with_lock
          election_setup_mutex
          (fun () ->
           lwt se = Ocsipersist.find election_stable uuid in
           let pkref = List.assoc token se.se_public_keys in
           let module G = (val Group.of_string se.se_group : GROUP) in
           let pk = trustee_public_key_of_string G.read public_key in
           let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
           if not (KG.check pk) then failwith "invalid public key";
           (* we keep pk as a string because of G.t *)
           pkref := public_key;
           Ocsipersist.add election_stable uuid se
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          ) >> T.generic_page ~title:"Success"
            "Your key has been received and checked!"
            () >>= Html5.send
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       )
    )

let () =
  Any.register
    ~service:election_setup_create
    (fun uuid () ->
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     match_lwt Web_auth_state.get_site_user () with
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     | None -> forbidden ()
     | Some u ->
        begin try_lwt
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          let uuid_s = Uuidm.to_string uuid in
          Lwt_mutex.with_lock election_setup_mutex (fun () ->
            lwt se = Ocsipersist.find election_stable uuid_s in
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            if se.se_owner <> u then forbidden () else
            let group = Group.of_string se.se_group in
            let module G = (val group : GROUP) in
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            let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
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            (* construct election data in memory *)
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            lwt public_keys, private_key =
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              match se.se_public_keys with
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              | [] ->
                 lwt private_key, public_key = KG.generate_and_prove () in
                 return ([public_key], Some private_key)
              | _ :: _ ->
                 return (List.rev_map
                   (fun (_, r) ->
                     if !r = "" then failwith "some public keys are missing";
                     trustee_public_key_of_string G.read !r
                   ) se.se_public_keys, None)
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            in
            let y = KG.combine (Array.of_list public_keys) in
            let template = se.se_questions in
            let params = {
              e_description = template.t_description;
              e_name = template.t_name;
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              e_public_key = {wpk_group = G.group; wpk_y = y};
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              e_questions = template.t_questions;
              e_uuid = uuid;
              e_short_name = template.t_short_name;
            } in
            let files = {
              f_election = !spool_dir / uuid_s ^ ".election.json";
              f_metadata = !spool_dir / uuid_s ^ ".metadata.json";
              f_public_keys = !spool_dir / uuid_s ^ ".public_keys.jsons";
              f_public_creds = !spool_dir / uuid_s ^ ".public_creds.txt";
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              f_voters = !spool_dir / uuid_s ^ ".voters.txt";
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            } in
            lwt _ =
              try_lwt Lwt_unix.stat files.f_public_creds
              with _ -> failwith "public credentials are missing"
            in
            (* write election files to disk *)
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            let create_file fname what xs =
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              Lwt_io.with_file
                ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
                ~perm:0o600 ~mode:Lwt_io.Output fname
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                (fun oc ->
                  Lwt_list.iter_s
                    (fun v ->
                      Lwt_io.write oc (what v) >>
                      Lwt_io.write oc "\n") xs)
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            in
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            create_file files.f_election (string_of_params (write_wrapped_pubkey G.write_group G.write)) [params] >>
            create_file files.f_metadata string_of_metadata [se.se_metadata] >>
            create_file files.f_voters (fun x -> x) se.se_voters >>
            create_file files.f_public_keys (string_of_trustee_public_key G.write) public_keys >>
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            (* actually create the election *)
            begin match_lwt import_election files with
            | None ->
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               T.new_election_failure `Exists () >>= Html5.send
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            | Some w ->
               let module W = (val w : REGISTRABLE_ELECTION) in
               lwt w = W.register () in
               let module W = (val w : WEB_ELECTION) in
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               (* create file with private key, if any *)
               lwt () =
                 match private_key with
                 | None -> return ()
                 | Some x ->
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                    let fname = W.D.dir / "private_key.json" in
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                    create_file fname string_of_number [x]
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               in
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               (* clean up temporary files *)
               Lwt_unix.unlink files.f_election >>
               Lwt_unix.unlink files.f_metadata >>
               Lwt_unix.unlink files.f_public_keys >>
               Lwt_unix.unlink files.f_public_creds >>
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               Lwt_unix.unlink files.f_voters >>
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               (* clean up tokens *)
               Ocsipersist.remove election_credtokens se.se_public_creds >>
               Lwt_list.iter_s
                 (fun (token, _) ->
                  Ocsipersist.remove election_pktokens token)
                 se.se_public_keys >>
               Ocsipersist.remove election_stable uuid_s >>
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               Web_persist.set_election_date uuid_s (now ()) >>
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               Redirection.send
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                 (preapply election_admin (W.D.election.e_params.e_uuid, ()))
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            end
          )
        with e ->
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          T.new_election_failure (`Exception e) () >>= Html5.send
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        end
    )
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let () =
  Any.register
    ~service:election_home
    (fun (uuid, ()) () ->
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      let uuid_s = Uuidm.to_string uuid in
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      try_lwt
        lwt w = find_election uuid_s in
        let module W = (val w) in
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        Eliom_reference.unset Web_services.ballot >>
        let cont () =
          Redirection.send
            (Eliom_service.preapply
               election_home (W.election.e_params.e_uuid, ()))
        in
        Eliom_reference.set Web_auth_state.cont [cont] >>
        match_lwt Eliom_reference.get Web_services.cast_confirmed with
        | Some result ->
           Eliom_reference.unset Web_services.cast_confirmed >>
           T.cast_confirmed (module W) ~result () >>= Html5.send
        | None ->
           lwt state = Web_persist.get_election_state uuid_s in
           T.election_home (module W) state () >>= Html5.send
      with Not_found ->
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        T.generic_page ~title:"Sorry, this election is not yet open"
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          "This election does not exist yet. Please come back later." ()
          >>= Html5.send)
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let () =
  Any.register
    ~service:election_admin
    (fun (uuid, ()) () ->
     let uuid_s = Uuidm.to_string uuid in
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     lwt w = find_election uuid_s in
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     lwt site_user = Web_auth_state.get_site_user () in
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     let module W = (val w) in
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     let uuid = Uuidm.to_string W.election.e_params.e_uuid in
     match site_user with
     | Some u when W.metadata.e_owner = Some u ->
        lwt state = Web_persist.get_election_state uuid in
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        T.election_admin (module W) state () >>= Html5.send
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       | _ -> forbidden ()
    )
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let election_set_state state (uuid, ()) () =
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     let uuid_s = Uuidm.to_string uuid in
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     lwt w = find_election uuid_s in
     let module W = (val w) in
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     lwt () =
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       match_lwt Web_auth_state.get_site_user () with
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       | Some u when W.metadata.e_owner = Some u -> return ()
       | _ -> forbidden ()
     in
     lwt () =
       match_lwt Web_persist.get_election_state uuid_s with
       | `Open | `Closed -> return ()
       | _ -> forbidden ()
     in
     let state = if state then `Open else `Closed in
     Web_persist.set_election_state uuid_s state >>
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     Redirection.send (preapply election_admin (uuid, ()))

let () = Any.register ~service:election_open (election_set_state true)
let () = Any.register ~service:election_close (election_set_state false)
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let () =
  Any.register
    ~service:election_update_credential
    (fun (uuid, ()) () ->
     let uuid_s = Uuidm.to_string uuid in
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     lwt w = find_election uuid_s in
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     lwt site_user = Web_auth_state.get_site_user () in
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     let module W = (val w) in
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     match site_user with
     | Some u ->
        if W.metadata.e_owner = Some u then (
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          T.update_credential (module W) () >>= Html5.send
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        ) else (
          forbidden ()
        )
     | _ -> forbidden ())
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let () =
  Any.register
    ~service:election_update_credential_post
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    (fun (uuid, ()) (old, new_) ->
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     let uuid_s = Uuidm.to_string uuid in
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     lwt w = find_election uuid_s in
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     lwt site_user = Web_auth_state.get_site_user () in
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     let module W = Web_election.Make ((val w)) (LwtRandom) in
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     let module B = W.B in
     let module W = W.D in
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     match site_user with
     | Some u ->
       if W.metadata.e_owner = Some u then (
         try_lwt
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           B.update_cred ~old ~new_ >>
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           String.send ("OK", "text/plain")
         with Error e ->
           String.send ("Error: " ^ explain_error e, "text/plain")
       ) >>= (fun x -> return @@ cast_unknown_content_kind x)
       else (
         forbidden ()
       )
     | _ -> forbidden ())
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let () =
  Any.register
    ~service:election_vote