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(**************************************************************************)
(*                                BELENIOS                                *)
(*                                                                        *)
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(*  Copyright © 2012-2016 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_builtin_t
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open Web_serializable_j
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open Web_common
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open Web_services
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let source_file = ref "belenios.tar.gz"
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let maxmailsatonce = ref 1000
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let ( / ) = Filename.concat

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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)

(* 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 raw_find_election uuid =
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  let%lwt raw_election = Web_persist.get_raw_election uuid in
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  match raw_election with
  | Some raw_election ->
     return (Group.election_params_of_string raw_election)
  | _ -> Lwt.fail Not_found
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module WCacheTypes = struct
  type key = string
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  type value = (module ELECTION_DATA)
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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 get_setup_election uuid_s =
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  let%lwt se = Ocsipersist.find election_stable uuid_s in
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  return (setup_election_of_string se)
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let set_setup_election uuid_s se =
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  Ocsipersist.add election_stable uuid_s (string_of_setup_election se)
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let dump_passwords dir table =
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  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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let finalize_election uuid se =
  let uuid_s = Uuidm.to_string uuid in
  (* voters *)
  let () =
    if se.se_voters = [] then failwith "no voters"
  in
  (* passwords *)
  let () =
    match se.se_metadata.e_auth_config with
    | Some [{auth_system = "password"; _}] ->
       if not @@ List.for_all (fun v -> v.sv_password <> None) se.se_voters then
         failwith "some passwords are missing"
    | _ -> ()
  in
  (* credentials *)
  let () =
    if not se.se_public_creds_received then
      failwith "public credentials are missing"
  in
  (* trustees *)
  let group = Group.of_string se.se_group in
  let module G = (val group : GROUP) in
  let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
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  let%lwt trustees, public_keys, private_key =
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    match se.se_public_keys with
    | [] ->
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       let%lwt private_key, public_key = KG.generate_and_prove () in
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       return (None, [public_key], Some private_key)
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    | _ :: _ ->
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       return (
         Some (List.map (fun {st_id; _} -> st_id) se.se_public_keys),
         (List.map
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            (fun {st_public_key; _} ->
              if st_public_key = "" then failwith "some public keys are missing";
              trustee_public_key_of_string G.read st_public_key
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            ) se.se_public_keys),
         None)
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  in
  let y = KG.combine (Array.of_list public_keys) in
  (* election parameters *)
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  let metadata = { se.se_metadata with e_trustees = trustees } in
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  let template = se.se_questions in
  let params = {
    e_description = template.t_description;
    e_name = template.t_name;
    e_public_key = {wpk_group = G.group; wpk_y = y};
    e_questions = template.t_questions;
    e_uuid = uuid;
  } in
  let raw_election = string_of_params (write_wrapped_pubkey G.write_group G.write) params in
  (* write election files to disk *)
  let dir = !spool_dir / uuid_s in
  let create_file fname what xs =
    Lwt_io.with_file
      ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
      ~perm:0o600 ~mode:Lwt_io.Output (dir / fname)
      (fun oc ->
        Lwt_list.iter_s
          (fun v ->
            Lwt_io.write oc (what v) >>
              Lwt_io.write oc "\n") xs)
  in
  Lwt_unix.mkdir dir 0o700 >>
  create_file "public_keys.jsons" (string_of_trustee_public_key G.write) public_keys >>
  create_file "voters.txt" (fun x -> x.sv_id) se.se_voters >>
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  create_file "metadata.json" string_of_metadata [metadata] >>
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  create_file "election.json" (fun x -> x) [raw_election] >>
  (* construct Web_election instance *)
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  let election = Group.election_params_of_string raw_election in
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  let module W = Web_election.Make ((val election)) (LwtRandom) in
  (* set up authentication *)
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  let%lwt () =
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    match 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_s auth_config
  in
  (* inject credentials *)
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  let%lwt () =
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    let fname = !spool_dir / uuid_s ^ ".public_creds.txt" in
    Lwt_io.lines_of_file fname |>
    Lwt_stream.iter_s W.B.inject_cred >>
    W.B.update_files () >>
    Lwt_unix.unlink fname
  in
  (* create file with private key, if any *)
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  let%lwt () =
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    match private_key with
    | None -> return_unit
    | Some x -> create_file "private_key.json" string_of_number [x]
  in
  (* clean up setup database *)
  Ocsipersist.remove election_credtokens se.se_public_creds >>
  Lwt_list.iter_s
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    (fun {st_token; _} ->
      Ocsipersist.remove election_pktokens st_token)
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    se.se_public_keys >>
  Ocsipersist.remove election_stable uuid_s >>
  (* inject passwords *)
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  (match metadata.e_auth_config with
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  | Some [{auth_system = "password"; _}] ->
     let table = "password_" ^ underscorize uuid_s in
     let table = Ocsipersist.open_table table in
     Lwt_list.iter_s
       (fun v ->
         let _, login = split_identity v.sv_id in
         match v.sv_password with
         | Some x -> Ocsipersist.add table login x
         | None -> return_unit
       ) se.se_voters >>
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       dump_passwords (!spool_dir / uuid_s) table
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  | _ -> return_unit) >>
  (* finish *)
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  Web_persist.set_election_state uuid_s `Open >>
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  Web_persist.set_election_date uuid_s (now ())
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let cleanup_table ?uuid_s table =
  let table = Ocsipersist.open_table table in
  match uuid_s with
  | None ->
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     let%lwt indexes = Ocsipersist.fold_step (fun k _ accu ->
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       return (k :: accu)) table []
     in
     Lwt_list.iter_s (Ocsipersist.remove table) indexes
  | Some u -> Ocsipersist.remove table u

let cleanup_file f =
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  try%lwt Lwt_unix.unlink f
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  with _ -> return_unit

let archive_election uuid_s =
  let uuid_u = underscorize uuid_s in
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  let%lwt () = cleanup_table ~uuid_s "election_states" in
  let%lwt () = cleanup_table ~uuid_s "election_pds" in
  let%lwt () = cleanup_table ~uuid_s "auth_configs" in
  let%lwt () = cleanup_table ("password_" ^ uuid_u) in
  let%lwt () = cleanup_table ("records_" ^ uuid_u) in
  let%lwt () = cleanup_table ("creds_" ^ uuid_u) in
  let%lwt () = cleanup_table ("ballots_" ^ uuid_u) in
  let%lwt () = cleanup_file (!spool_dir / uuid_s / "private_key.json") in
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  return_unit

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let () = Any.register ~service:home
  (fun () () ->
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    Eliom_reference.unset Web_state.cont >>
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    Redirection.send admin
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  )

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let get_finalized_elections_by_owner u =
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  let%lwt elections, tallied, archived =
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    Web_persist.get_elections_by_owner u >>=
    Lwt_list.fold_left_s (fun accu uuid_s ->
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        let%lwt w = find_election uuid_s in
        let%lwt state = Web_persist.get_election_state uuid_s in
        let%lwt date = Web_persist.get_election_date uuid_s in
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        let elections, tallied, archived = accu in
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        match state with
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        | `Tallied _ -> return (elections, (date, w) :: tallied, archived)
        | `Archived -> return (elections, tallied, (date, w) :: archived)
        | _ -> return ((date, w) :: elections, tallied, archived)
    ) ([], [], [])
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  in
  let sort l =
    List.sort (fun (x, _) (y, _) -> datetime_compare x y) l |>
    List.map (fun (_, x) -> x)
  in
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  return (sort elections, sort tallied, sort archived)
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let () = Html5.register ~service:admin
  (fun () () ->
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    let cont () = Redirection.send admin in
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    Eliom_reference.set Web_state.cont [cont] >>
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    let%lwt site_user = Web_state.get_site_user () in
    let%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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         let%lwt elections, tallied, archived = get_finalized_elections_by_owner u in
         let%lwt setup_elections =
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           Ocsipersist.fold_step (fun k v accu ->
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             let v = setup_election_of_string v in
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             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
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         return @@ Some (elections, tallied, archived, 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 =
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  let prng = Lazy.from_fun (Lwt_preemptive.detach (fun () ->
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    pseudo_rng (random_string secure_rng 16)
  )) in
  let mutex = Lwt_mutex.create () in
  fun () ->
    Lwt_mutex.with_lock mutex (fun () ->
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      let%lwt prng = Lazy.force prng in
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      return (random_string prng 32)
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    )

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let b64_encode_compact x =
  Cryptokit.(transform_string (Base64.encode_compact ()) x)

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let () = String.register
  ~service:get_randomness
  (fun () () ->
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    let%lwt r = do_get_randomness () in
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    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 ())

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let create_new_election owner cred auth =
  let e_cred_authority = match cred with
    | `Automatic -> Some "server"
    | `Manual -> None
  in
  let e_auth_config = match auth with
    | `Password -> Some [{auth_system = "password"; auth_instance = "password"; auth_config = []}]
    | `Dummy -> Some [{auth_system = "dummy"; auth_instance = "dummy"; auth_config = []}]
    | `CAS server -> Some [{auth_system = "cas"; auth_instance = "cas"; auth_config = ["server", server]}]
  in
  let uuid = generate_uuid () in
  let uuid_s = Uuidm.to_string uuid in
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  let%lwt token = generate_token () in
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  let se_metadata = {
    e_owner = Some owner;
    e_auth_config;
    e_cred_authority;
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    e_trustees = None;
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    e_languages = Some ["en"; "fr"];
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  } in
  let question = {
    q_answers = [| "Answer 1"; "Answer 2"; "Blank" |];
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    q_blank = None;
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    q_min = 1;
    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 |];
  } in
  let se = {
    se_owner = owner;
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    se_group = "{\"g\":\"2402352677501852209227687703532399932712287657378364916510075318787663274146353219320285676155269678799694668298749389095083896573425601900601068477164491735474137283104610458681314511781646755400527402889846139864532661215055797097162016168270312886432456663834863635782106154918419982534315189740658186868651151358576410138882215396016043228843603930989333662772848406593138406010231675095763777982665103606822406635076697764025346253773085133173495194248967754052573659049492477631475991575198775177711481490920456600205478127054728238140972518639858334115700568353695553423781475582491896050296680037745308460627\",\"p\":\"20694785691422546401013643657505008064922989295751104097100884787057374219242717401922237254497684338129066633138078958404960054389636289796393038773905722803605973749427671376777618898589872735865049081167099310535867780980030790491654063777173764198678527273474476341835600035698305193144284561701911000786737307333564123971732897913240474578834468260652327974647951137672658693582180046317922073668860052627186363386088796882120769432366149491002923444346373222145884100586421050242120365433561201320481118852408731077014151666200162313177169372189248078507711827842317498073276598828825169183103125680162072880719\",\"q\":\"78571733251071885079927659812671450121821421258408794611510081919805623223441\"}"; (* generated by fips.sage *)
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    se_voters = [];
    se_questions;
    se_public_keys = [];
    se_metadata;
    se_public_creds = token;
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    se_public_creds_received = false;
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  } in
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  let%lwt () = set_setup_election uuid_s se in
  let%lwt () = Ocsipersist.add election_credtokens token uuid_s in
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  return (preapply election_setup uuid)

let () = Html5.register ~service:election_setup_pre
  (fun () () -> T.election_setup_pre ())

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let () = Redirection.register ~service:election_setup_new
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  (fun () (credmgmt, (auth, cas_server)) ->
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   match%lwt Web_state.get_site_user () with
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   | Some u ->
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      let%lwt credmgmt = match credmgmt with
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        | Some "auto" -> return `Automatic
        | Some "manual" -> return `Manual
        | _ -> fail_http 400
      in
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      let%lwt auth = match auth with
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        | Some "password" -> return `Password
        | Some "dummy" -> return `Dummy
        | Some "cas" -> return @@ `CAS cas_server
        | _ -> fail_http 400
      in
      create_new_election u credmgmt auth
   | None -> forbidden ())
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let generic_setup_page f uuid () =
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  match%lwt Web_state.get_site_user () with
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  | Some u ->
     let uuid_s = Uuidm.to_string uuid in
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     let%lwt se = get_setup_election uuid_s in
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     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_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 () ->
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       let%lwt se = get_setup_election uuid_s in
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       if se.se_owner = u then (
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         try%lwt
           let%lwt cont = f se x u uuid in
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           set_setup_election uuid_s se >>
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           cont ()
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         with e ->
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           let service = preapply election_setup uuid in
           T.generic_page ~title:"Error" ~service (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_languages
    (handle_setup
       (fun se languages _ uuid ->
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         let langs = languages_of_string languages in
         match langs with
         | None -> assert false
         | Some [] ->
            return (fun () ->
                let service = preapply election_setup uuid in
                T.generic_page ~title:"Error" ~service
                  "You must select at least one language!" () >>= Html5.send
              )
         | Some ls ->
            let unavailable =
              List.filter (fun x ->
                  not (List.mem x available_languages)
                ) ls
            in
            match unavailable with
            | [] ->
               se.se_metadata <- {
                  se.se_metadata with
                  e_languages = langs
                };
               return (redir_preapply election_setup uuid)
            | l :: _ ->
               return (fun () ->
                   let service = preapply election_setup uuid in
                   T.generic_page ~title:"Error" ~service
                     ("No such language: " ^ l) () >>= Html5.send
                 )
    ))
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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 generate_password langs title url id =
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  let email, login = split_identity id in
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  let%lwt salt = generate_token () in
  let%lwt password = generate_token () in
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  let hashed = sha256_hex (salt ^ password) in
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  let bodies = List.map (fun lang ->
    let module L = (val Web_i18n.get_lang lang) in
    Printf.sprintf L.mail_password title login password url
  ) langs in
  let body = PString.concat "\n\n----------\n\n" bodies in
  let body = body ^ "\n\n-- \nBelenios" in
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  let subject =
    let lang = List.hd langs in
    let module L = (val Web_i18n.get_lang lang) in
    Printf.sprintf L.mail_password_subject title
  in
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  send_email email subject body >>
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  return (salt, hashed)
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let handle_password se uuid ~force voters =
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  if List.length voters > !maxmailsatonce then
    Lwt.fail (Failure (Printf.sprintf "Cannot send passwords, there are too many voters (max is %d)" !maxmailsatonce))
  else
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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 langs = get_languages se.se_metadata.e_languages in
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  Lwt_list.iter_s (fun id ->
    match id.sv_password with
    | Some _ when not force -> return_unit
    | None | Some _ ->
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       let%lwt x = generate_password langs title url id.sv_id in
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       return (id.sv_password <- Some x)
  ) voters >>
  return (fun () ->
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    let service = preapply election_setup uuid in
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    T.generic_page ~title:"Success" ~service
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      "Passwords have been generated and mailed!" () >>= Html5.send)

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let () =
  Any.register
    ~service:election_setup_auth_genpwd
    (handle_setup
       (fun se () _ uuid ->
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         handle_password se uuid ~force:false se.se_voters))
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let () =
  Any.register
    ~service:election_regenpwd
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    (fun (uuid, ()) () ->
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      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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      let%lwt w = find_election uuid_s in
      let%lwt metadata = Web_persist.get_election_metadata uuid_s in
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      let module W = (val w) in
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      let%lwt site_user = Web_state.get_site_user () in
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      match site_user with
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      | Some u when metadata.e_owner = Some u ->
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         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
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         let service = preapply election_admin (uuid, ()) in
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         begin try%lwt
           let%lwt _ = Ocsipersist.find table user in
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           let langs = get_languages metadata.e_languages in
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           let%lwt x = generate_password langs title url user in
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           Ocsipersist.add table user x >>
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           dump_passwords (!spool_dir / uuid_s) table >>
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           T.generic_page ~title:"Success" ~service
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             ("A new password has been mailed to " ^ user ^ ".") ()
           >>= Html5.send
         with Not_found ->
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           T.generic_page ~title:"Error" ~service
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             (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_state.get_site_user () with
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     | Some u ->
        let uuid_s = Uuidm.to_string uuid in
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        let%lwt se = get_setup_election uuid_s in
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        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;
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         return (redir_preapply election_setup uuid)))
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let () =
  Html5.register
    ~service:election_setup_voters
    (fun uuid () ->
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      match%lwt Web_state.get_site_user () with
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      | Some u ->
         let uuid_s = Uuidm.to_string uuid in
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         let%lwt se = get_setup_election uuid_s in
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         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 *)
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let identity_rex = Pcre.regexp
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  ~flags:[`CASELESS]
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  "^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,7}(,[A-Z0-9._%+-]+)?$"
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let is_identity x =
  try ignore (Pcre.pcre_exec ~rex:identity_rex x); true
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  with Not_found -> false

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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

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module SSet = Set.Make (PString)

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let merge_voters a b f =
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  let existing = List.fold_left (fun accu sv ->
    SSet.add sv.sv_id accu
  ) SSet.empty a in
  let _, res = List.fold_left (fun (existing, accu) sv_id ->
    if SSet.mem sv_id existing then
      (existing, accu)
    else
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      (SSet.add sv_id existing, {sv_id; sv_password = f sv_id} :: accu)
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  ) (existing, List.rev a) b in
  List.rev res

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let () =
  Any.register
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    ~service:election_setup_voters_add
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    (handle_setup
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       (fun se x _ uuid ->
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         if se.se_public_creds_received then forbidden () else (
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         let xs = Pcre.split x in
         let () =
           try
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             let bad = List.find (fun x -> not (is_identity x)) xs in
             Printf.ksprintf failwith "%S is not a valid identity" bad
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           with Not_found -> ()
         in
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         se.se_voters <- merge_voters se.se_voters xs (fun _ -> None);
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         return (redir_preapply election_setup_voters uuid))))
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let () =
  Any.register
    ~service:election_setup_voters_remove
    (handle_setup
       (fun se voter _ uuid ->
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         if se.se_public_creds_received then forbidden () else (
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         se.se_voters <- List.filter (fun v ->
           v.sv_id <> voter
         ) se.se_voters;
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         return (redir_preapply election_setup_voters uuid))))
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let () =
  Any.register ~service:election_setup_voters_passwd
    (handle_setup
       (fun se voter _ uuid ->
         let voter = List.filter (fun v -> v.sv_id = voter) se.se_voters in
         handle_password se uuid ~force:true voter))

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let () =
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  Any.register
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    ~service:election_setup_trustee_add
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    (fun uuid st_id ->
     if is_email st_id then
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     match%lwt Web_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 () ->
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          let%lwt se = get_setup_election uuid_s in
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          if se.se_owner = u
          then (
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            let%lwt st_token = generate_token () in
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            let trustee = {st_id; st_token; st_public_key = ""} in
            se.se_public_keys <- se.se_public_keys @ [trustee];
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            set_setup_election uuid_s se >>
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            Ocsipersist.add election_pktokens st_token uuid_s
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          ) else forbidden ()
        ) >>
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        Redirection.send (preapply election_setup_trustees uuid)
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     | None -> forbidden ()
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     else
       let msg = st_id ^ " is not a valid e-mail address!" in
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       let service = preapply election_setup_trustees uuid in
       T.generic_page ~title:"Error" ~service msg () >>= Html5.send
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    )

let () =
  Redirection.register
    ~service:election_setup_trustee_del
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    (fun uuid index ->
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     match%lwt Web_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 () ->
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          let%lwt se = get_setup_election uuid_s in
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          if se.se_owner = u
          then (
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            let trustees, old =
              se.se_public_keys |>
              List.mapi (fun i x -> i, x) |>
              List.partition (fun (i, _) -> i <> index) |>
              (fun (x, y) -> List.map snd x, List.map snd y)
            in
            se.se_public_keys <- trustees;
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            set_setup_election uuid_s se >>
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            Lwt_list.iter_s (fun {st_token; _} ->
              Ocsipersist.remove election_pktokens st_token
            ) old
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          ) 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 () ->
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     let%lwt uuid = Ocsipersist.find election_credtokens token in
     let%lwt se = get_setup_election uuid in
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     let uuid = match Uuidm.of_string uuid with
       | None -> failwith "invalid UUID extracted from credtokens"
       | Some u -> u
     in
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     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 () ->
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     let%lwt uuid = Ocsipersist.find election_credtokens token in
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     return (!spool_dir / uuid ^ ".public_creds.txt")
    )
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let wrap_handler f =
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  try%lwt f ()
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  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 =
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  let%lwt uuid = Ocsipersist.find election_credtokens token in
  let%lwt se = get_setup_election uuid in
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  if se.se_public_creds_received then forbidden () else
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  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)
    ) >>
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  let%lwt () =
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    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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  let () = se.se_public_creds_received <- true in
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  set_setup_election uuid se >>
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  T.generic_page ~title:"Success" ~service:home
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    "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 CG = Credential.MakeGenerate (LwtRandom)
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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 nvoters = List.length se.se_voters in
      if nvoters > !maxmailsatonce then
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        Lwt.fail (Failure (Printf.sprintf "Cannot send credentials, there are too many voters (max is %d)" !maxmailsatonce))
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      else if nvoters = 0 then
        Lwt.fail (Failure "No voters")
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      else
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      if se.se_public_creds_received then forbidden () else
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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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      let module S = Set.Make (PString) in
      let module G = (val Group.of_string se.se_group : GROUP) in
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      let module CD = Credential.MakeDerive (G) in
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      let%lwt creds =
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        Lwt_list.fold_left_s (fun accu v ->
          let email, login = split_identity v.sv_id in
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          let%lwt cred = CG.generate () in
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          let pub_cred =
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            let x = CD.derive uuid cred in
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            let y = G.(g **~ x) in
            G.to_string y
          in
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          let langs = get_languages se.se_metadata.e_languages in
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          let bodies = List.map (fun lang ->
            let module L = (val Web_i18n.get_lang lang) in
            Printf.sprintf L.mail_credential title login cred url
          ) langs in
          let body = PString.concat "\n\n----------\n\n" bodies in
          let body = body ^ "\n\n-- \nBelenios" in
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          let subject =
            let lang = List.hd langs in
            let module L = (val Web_i18n.get_lang lang) in
            Printf.sprintf L.mail_credential_subject title
          in
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          let%lwt () = send_email email 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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      let%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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      se.se_public_creds_received <- true;
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      return (fun () ->
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        let service = preapply election_setup uuid in
        T.generic_page ~title:"Success" ~service
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          "Credentials have been generated and mailed!" () >>= Html5.send)))
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let () =
  Html5.register
    ~service:election_setup_trustee
    (fun token () ->
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     let%lwt uuid = Ocsipersist.find election_pktokens token in
     let%lwt se = get_setup_election uuid in
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     let uuid = match Uuidm.of_string uuid with
       | None -> failwith "invalid UUID extracted from pktokens"
       | Some u -> u
     in
     T.election_setup_trustee token uuid se ()
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    )

let () =
  Any.register
    ~service:election_setup_trustee_post
    (fun token public_key ->
     wrap_handler
       (fun () ->
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        let%lwt uuid = Ocsipersist.find election_pktokens token in
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        Lwt_mutex.with_lock
          election_setup_mutex
          (fun () ->
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           let%lwt se = get_setup_election uuid in
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           let t = List.find (fun x -> token = x.st_token) se.se_public_keys in
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           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 *)
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           t.st_public_key <- public_key;
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           set_setup_election uuid se
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