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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

(* 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"

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(* Table with tokens given to trustees (in threshold mode). *)
let election_tpktokens = Ocsipersist.open_table "site_tpktokens"

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(* Table with tokens given to trustees (in threshold mode) to decrypt *)
let election_tokens_decrypt = Ocsipersist.open_table "site_tokens_decrypt"

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(* 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
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  let%lwt y, trustees, pk_or_tp, private_keys =
    match se.se_threshold_trustees with
    | None ->
       let module KG = Trustees.MakeSimple (G) (LwtRandom) in
       let%lwt trustees, public_keys, private_key =
         match se.se_public_keys with
         | [] ->
            let%lwt private_key = KG.generate () in
            let%lwt public_key = KG.prove private_key in
            return (None, [public_key], `KEY private_key)
         | _ :: _ ->
            return (
                Some (List.map (fun {st_id; _} -> st_id) se.se_public_keys),
                (List.map
                   (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
                   ) se.se_public_keys),
                `None)
       in
       let y = KG.combine (Array.of_list public_keys) in
       return (y, trustees, `PK public_keys, private_key)
    | Some ts ->
       match se.se_threshold_parameters with
       | None -> failwith "key establishment not finished"
       | Some tp ->
          let tp = threshold_parameters_of_string G.read tp in
          let module P = Trustees.MakePKI (G) (LwtRandom) in
          let module C = Trustees.MakeChannels (G) (LwtRandom) (P) in
          let module K = Trustees.MakePedersen (G) (LwtRandom) (P) (C) in
          let trustees = List.map (fun {stt_id; _} -> stt_id) ts in
          let private_keys =
            List.map (fun {stt_voutput; _} ->
                match stt_voutput with
                | Some v ->
                   let voutput = voutput_of_string G.read v in
                   voutput.vo_private_key
                | None -> failwith "inconsistent state"
              ) ts
          in
          let y = K.combine tp in
          return (y, Some trustees, `TP tp, `KEYS private_keys)
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  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 >>
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  (match pk_or_tp with
   | `PK pk -> create_file "public_keys.jsons" (string_of_trustee_public_key G.write) pk
   | `TP tp -> create_file "threshold.json" (string_of_threshold_parameters G.write) [tp]
  ) >>
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  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
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  (* create file with private keys, if any *)
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  let%lwt () =
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    match private_keys with
    | `None -> return_unit
    | `KEY x -> create_file "private_key.json" string_of_number [x]
    | `KEYS x -> create_file "private_keys.jsons" (fun x -> x) x
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  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 >>
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  (match se.se_threshold_trustees with
   | None -> return_unit
   | Some ts ->
      Lwt_list.iter_s
        (fun x -> Ocsipersist.remove election_tpktokens x.stt_token)
        ts
  ) >>
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  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
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  let%lwt () = cleanup_table ~uuid_s "site_tokens_decrypt" in
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  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 with_site_user f =
  match%lwt Web_state.get_site_user () with
  | Some u -> f u
  | None -> forbidden ()

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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 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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  )

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

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

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let redir_preapply s u () = Redirection.send (preapply s u)

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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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    se_threshold = None;
    se_threshold_trustees = None;
    se_threshold_parameters = None;
    se_threshold_error = None;
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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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  redir_preapply election_setup uuid ()
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let () = Html5.register ~service:election_setup_pre
  (fun () () -> T.election_setup_pre ())

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let () = Any.register ~service:election_setup_new
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  (fun () (credmgmt, (auth, cas_server)) ->
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    with_site_user (fun u ->
        let%lwt credmgmt = match credmgmt with
          | Some "auto" -> return `Automatic
          | Some "manual" -> return `Manual
          | _ -> fail_http 400
        in
        let%lwt auth = match auth with
          | Some "password" -> return `Password
          | Some "dummy" -> return `Dummy
          | Some "cas" -> return @@ `CAS cas_server
          | _ -> fail_http 400
        in
        create_new_election u credmgmt auth
      )
  )
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let with_setup_election_ro uuid f =
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  with_site_user (fun u ->
      let uuid_s = Uuidm.to_string uuid in
      let%lwt se = get_setup_election uuid_s in
      if se.se_owner = u then
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        f se
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      else forbidden ()
    )
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let () =
  Html5.register ~service:election_setup
    (fun uuid () ->
      with_setup_election_ro uuid (fun se ->
          T.election_setup uuid se ()
        )
    )
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let () =
  Any.register ~service:election_setup_trustees
    (fun uuid () ->
      with_setup_election_ro uuid (fun se ->
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          match se.se_threshold_trustees with
          | None -> T.election_setup_trustees uuid se () >>= Html5.send
          | Some _ -> redir_preapply election_setup_threshold_trustees uuid ()
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        )
    )
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let () =
  Html5.register ~service:election_setup_threshold_trustees
    (fun uuid () ->
      with_setup_election_ro uuid (fun se ->
          T.election_setup_threshold_trustees uuid se ()
        )
    )
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let () =
  Html5.register ~service:election_setup_credential_authority
    (fun uuid () ->
      with_setup_election_ro uuid (fun se ->
          T.election_setup_credential_authority uuid se ()
        )
    )
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let election_setup_mutex = Lwt_mutex.create ()

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let with_setup_election uuid f =
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  with_site_user (fun u ->
      let uuid_s = Uuidm.to_string uuid in
      Lwt_mutex.with_lock election_setup_mutex (fun () ->
          let%lwt se = get_setup_election uuid_s in
          if se.se_owner = u then (
            try%lwt
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              let%lwt r = f se in
              let%lwt () = set_setup_election uuid_s se in
              return r
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            with e ->
              let service = preapply election_setup uuid in
              T.generic_page ~title:"Error" ~service (Printexc.to_string e) () >>= Html5.send
          ) else forbidden ()
        )
    )
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let () =
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  Any.register ~service:election_setup_languages
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    (fun uuid languages ->
      with_setup_election uuid (fun se ->
          let langs = languages_of_string languages in
          match langs with
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          | [] ->
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             let service = preapply election_setup uuid in
             T.generic_page ~title:"Error" ~service
               "You must select at least one language!" () >>= Html5.send
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          | _ :: _ ->
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             let unavailable =
               List.filter (fun x ->
                   not (List.mem x available_languages)
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                 ) langs
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             in
             match unavailable with
             | [] ->
                se.se_metadata <- {
                   se.se_metadata with
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                   e_languages = Some langs
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                 };
                redir_preapply election_setup uuid ()
             | l :: _ ->
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                let service = preapply election_setup uuid in
                T.generic_page ~title:"Error" ~service
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                  ("No such language: " ^ l) () >>= Html5.send
        )
    )
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let () =
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  Any.register ~service:election_setup_description
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    (fun uuid (name, description) ->
      with_setup_election uuid (fun se ->
          se.se_questions <- {se.se_questions with
                               t_name = name;
                               t_description = description;
                             };
          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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  let%lwt () =
    Lwt_list.iter_s (fun id ->
        match id.sv_password with
        | Some _ when not force -> return_unit
        | None | Some _ ->
           let%lwt x = generate_password langs title url id.sv_id in
           return (id.sv_password <- Some x)
      ) voters
  in
  let service = preapply election_setup uuid in
  T.generic_page ~title:"Success" ~service
    "Passwords have been generated and mailed!" () >>= Html5.send
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let () =
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  Any.register ~service:election_setup_auth_genpwd
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    (fun uuid () ->
      with_setup_election uuid (fun se ->
          handle_password se uuid ~force:false se.se_voters
        )
    )
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let () =
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  Any.register ~service:election_regenpwd
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    (fun (uuid, ()) () ->
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      T.regenpwd uuid () >>= Html5.send)

let () =
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  Any.register ~service:election_regenpwd_post
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    (fun (uuid, ()) user ->
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      with_site_user (fun u ->
          let uuid_s = Uuidm.to_string uuid in
          let%lwt w = find_election uuid_s in
          let%lwt metadata = Web_persist.get_election_metadata uuid_s in
          let module W = (val w) in
          if metadata.e_owner = Some u then (
            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
            let service = preapply election_admin (uuid, ()) in
            (try%lwt
               let%lwt _ = Ocsipersist.find table user in
               let langs = get_languages metadata.e_languages in
               let%lwt x = generate_password langs title url user in
               Ocsipersist.add table user x >>
                 dump_passwords (!spool_dir / uuid_s) table >>
                 T.generic_page ~title:"Success" ~service
                   ("A new password has been mailed to " ^ user ^ ".") ()
               >>= Html5.send
              with Not_found ->
                T.generic_page ~title:"Error" ~service
                  (user ^ " is not a registered user for this election.") ()
                >>= Html5.send
            )
          ) else forbidden ()
        )
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    )

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let () =
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  Html5.register ~service:election_setup_questions
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    (fun uuid () ->
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      with_setup_election_ro uuid (fun se ->
          T.election_setup_questions uuid se ()
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        )
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    )

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let () =
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  Any.register ~service:election_setup_questions_post
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    (fun uuid template ->
      with_setup_election uuid (fun se ->
          se.se_questions <- template_of_string template;
          redir_preapply election_setup uuid ()
        )
    )
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let () =
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  Html5.register ~service:election_setup_voters
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    (fun uuid () ->
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      with_setup_election_ro uuid (fun se ->
          T.election_setup_voters uuid se !maxmailsatonce ()
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        )
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    )

(* 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 () =
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  Any.register ~service:election_setup_voters_add
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    (fun uuid voters ->
      with_setup_election uuid (fun se ->
          if se.se_public_creds_received then
            forbidden ()
          else (
            let voters = Pcre.split voters in
            let () =
              try
                let bad = List.find (fun x -> not (is_identity x)) voters in
                Printf.ksprintf failwith "%S is not a valid identity" bad
              with Not_found -> ()
            in
            se.se_voters <- merge_voters se.se_voters voters (fun _ -> None);
            redir_preapply election_setup_voters uuid ()
          )
        )
    )
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let () =
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  Any.register ~service:election_setup_voters_remove
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    (fun uuid voter ->
      with_setup_election uuid (fun se ->
          if se.se_public_creds_received then
            forbidden ()
          else (
            se.se_voters <- List.filter (fun v -> v.sv_id <> voter) se.se_voters;
            redir_preapply election_setup_voters uuid ()
          )
        )
    )
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let () =
  Any.register ~service:election_setup_voters_passwd
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    (fun uuid voter ->
      with_setup_election uuid (fun se ->
          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 ~service:election_setup_trustee_add
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    (fun uuid st_id ->
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      with_setup_election uuid (fun se ->
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          if is_email st_id then (
            let uuid_s = Uuidm.to_string uuid in
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            let%lwt st_token = generate_token () in
            let trustee = {st_id; st_token; st_public_key = ""} in
            se.se_public_keys <- se.se_public_keys @ [trustee];
            let%lwt () = Ocsipersist.add election_pktokens st_token uuid_s in
            redir_preapply election_setup_trustees uuid ()
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          ) else (
            let msg = st_id ^ " is not a valid e-mail address!" in
            let service = preapply election_setup_trustees uuid in
            T.generic_page ~title:"Error" ~service msg () >>= Html5.send
          )
        )
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    )

let () =
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  Any.register ~service:election_setup_trustee_del
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    (fun uuid index ->
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      with_setup_election uuid (fun se ->
          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;
          let%lwt () =
            Lwt_list.iter_s (fun {st_token; _} ->
                Ocsipersist.remove election_pktokens st_token
              ) old
          in
          redir_preapply election_setup_trustees uuid ()
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        )
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    )

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let () =
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  Html5.register ~service:election_setup_credentials
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    (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 () =
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  File.register ~service:election_setup_credentials_download
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    ~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 () =
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  Any.register ~service:election_setup_credentials_post
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    (fun token creds ->
     let s = Lwt_stream.of_string creds in
     wrap_handler (fun () -> handle_credentials_post token s))
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let () =
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  Any.register ~service:election_setup_credentials_post_file
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    (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 () =
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  Any.register ~service:election_setup_credentials_server
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    (fun uuid () ->
      with_setup_election uuid (fun se ->
          let nvoters = List.length se.se_voters in
          if nvoters > !maxmailsatonce then
            Lwt.fail (Failure (Printf.sprintf "Cannot send credentials, there are too many voters (max is %d)" !maxmailsatonce))
          else if nvoters = 0 then
            Lwt.fail (Failure "No voters")
          else if se.se_public_creds_received then
            forbidden ()
          else (
            let () = se.se_metadata <- {se.se_metadata with
                                         e_cred_authority = Some "server"
                                       } in
            let uuid_s = Uuidm.to_string uuid in
            let title = se.se_questions.t_name in
            let url = Eliom_uri.make_string_uri
                        ~absolute:true ~service:election_home
                        (uuid, ()) |> rewrite_prefix
            in
            let module S = Set.Make (PString) in
            let module G = (val Group.of_string se.se_group : GROUP) in
            let module CD = Credential.MakeDerive (G) in
            let%lwt creds =
              Lwt_list.fold_left_s (fun accu v ->
                  let email, login = split_identity v.sv_id in
                  let%lwt cred = CG.generate () in
                  let pub_cred =
                    let x = CD.derive uuid cred in
                    let y = G.(g **~ x) in
                    G.to_string y
                  in
                  let langs = get_languages se.se_metadata.e_languages in
                  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
                  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
                  let%lwt () = send_email email subject body in
                  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
            let%lwt () =
              Lwt_io.with_file
                ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
                ~perm:0o600 ~mode:Lwt_io.Output fname
                (fun oc ->
                  Lwt_list.iter_s (Lwt_io.write_line oc) creds)
            in
            se.se_public_creds_received <- true;
            let service = preapply election_setup uuid in
            T.generic_page ~title:"Success" ~service
              "Credentials have been generated and mailed!" () >>= Html5.send
          )
        )
    )
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let () =
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  Html5.register ~service:election_setup_trustee
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    (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 () =
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  Any.register ~service:election_setup_trustee_post
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    (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
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           let module KG = Trustees.MakeSimple (G) (LwtRandom) in
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           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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          ) >> T.generic_page ~title:"Success"
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            "Your key has been received and checked!"
            () >>= Html5.send
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       )
    )

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let () =
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  Any.register ~service:election_setup_confirm
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    (fun uuid () ->
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      with_setup_election_ro uuid (fun se ->
          T.election_setup_confirm uuid se () >>= Html5.send
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        )
    )
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let () =
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  Any.register ~service:election_setup_create
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    (fun uuid () ->
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      with_setup_election uuid (fun se ->
          try%lwt
            let%lwt () = finalize_election uuid se in
            redir_preapply election_admin (uuid, ()) ()
          with e ->
            T.new_election_failure (`Exception e) () >>= Html5.send
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        )
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    )
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let () =
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  Html5.register ~service:election_setup_import
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    (fun uuid () ->
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      with_setup_election_ro uuid (fun se ->
          let%lwt elections = get_finalized_elections_by_owner se.se_owner in
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          T.election_setup_import uuid se elections ()
        )
    )
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let () =
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  Any.register ~service:election_setup_import_post
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    (fun uuid from ->
      with_setup_election uuid (fun se ->
          let from_s = Uuidm.to_string from in
          let%lwt voters = Web_persist.get_voters from_s in
          let%lwt passwords = Web_persist.get_passwords from_s in
          let get_password =
            match passwords with
            | None -> fun _ -> None
            | Some p -> fun sv_id ->
                        let _, login = split_identity sv_id in
                        try Some (SMap.find login p)
                        with Not_found -> None
          in
          match voters with
          | Some voters ->
             if se.se_public_creds_received then
               forbidden ()
             else (
               se.se_voters <- merge_voters se.se_voters voters get_password;
               redir_preapply election_setup_voters uuid ()
             )
          | None ->
             T.generic_page ~title:"Error"
               ~service:(preapply election_setup_voters uuid)
               (Printf.sprintf
                  "Could not retrieve voter list from election %s"
                  from_s)
               () >>= Html5.send
        )
    )
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let () =
  Html5.register ~service:election_setup_import_trustees
    (fun uuid () ->
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      with_setup_election_ro uuid (fun se ->
          let%lwt elections = get_finalized_elections_by_owner se.se_owner in
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          T.election_setup_import_trustees uuid se elections ()
        )
    )
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exception TrusteeImportError of string

let () =
  Any.register ~service:election_setup_import_trustees_post
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    (fun uuid from ->
      with_setup_election uuid (fun se ->
          let uuid_s = Uuidm.to_string uuid in
          let from_s = Uuidm.to_string from in
          let%lwt metadata = Web_persist.get_election_metadata from_s in
          let%lwt threshold = Web_persist.get_threshold from_s in
          let%lwt public_keys = Web_persist.get_public_keys from_s in
          try%lwt
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032
               match metadata.e_trustees, threshold, public_keys with
               | Some ts, Some raw_tp, None ->
                  if se.se_threshold_trustees <> None then
                    raise (TrusteeImportError "Importing threshold trustees after having already added ones is not supported");
                  let module G = (val Group.of_string se.se_group : GROUP) in
                  let module P = Trustees.MakePKI (G) (LwtRandom) in
                  let module C = Trustees.MakeChannels (G) (LwtRandom) (P) in
                  let module K = Trustees.MakePedersen (G) (LwtRandom) (P) (C) in
                  let tp = threshold_parameters_of_string G.read raw_tp in
                  if not (K.check tp) then
                    raise (TrusteeImportError "Imported threshold trustees are invalid for this election!");
                  let%lwt privs = Web_persist.get_private_keys from_s in
                  let%lwt se_threshold_trustees =
                    match privs with
                    | Some privs ->
                       let rec loop ts pubs privs accu =
                         match ts, pubs, privs with
                         | stt_id :: ts, vo_public_key :: pubs, vo_private_key :: privs ->
                            let%lwt stt_token = generate_token () in
                            let stt_voutput = {vo_public_key; vo_private_key} in
                            let stt_voutput = Some (string_of_voutput G.write stt_voutput) in
                            let stt = {
                                stt_id; stt_token; stt_voutput;
                                stt_step = Some 7; stt_cert = None;
                                stt_polynomial = None; stt_vinput = None;
                              } in
                            loop ts pubs privs (stt :: accu)
                         | [], [], [] -> return (List.rev accu)
                         | _, _, _ -> raise (TrusteeImportError "Inconsistency in imported election!")
                       in loop ts (Array.to_list tp.t_verification_keys) privs []
                    | None -> raise (TrusteeImportError "Encrypted decryption keys are missing!")
                  in
                  se.se_threshold <- Some tp.t_threshold;
                  se.se_threshold_trustees <- Some se_threshold_trustees;