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(**************************************************************************)
(*                                BELENIOS                                *)
(*                                                                        *)
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(*  Copyright © 2012-2014 Inria                                           *)
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(*                                                                        *)
(*  This program is free software: you can redistribute it and/or modify  *)
(*  it under the terms of the GNU Affero General Public License as        *)
(*  published by the Free Software Foundation, either version 3 of the    *)
(*  License, or (at your option) any later version, with the additional   *)
(*  exemption that compiling, linking, and/or using OpenSSL is allowed.   *)
(*                                                                        *)
(*  This program is distributed in the hope that it will be useful, but   *)
(*  WITHOUT ANY WARRANTY; without even the implied warranty of            *)
(*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *)
(*  Affero General Public License for more details.                       *)
(*                                                                        *)
(*  You should have received a copy of the GNU Affero General Public      *)
(*  License along with this program.  If not, see                         *)
(*  <http://www.gnu.org/licenses/>.                                       *)
(**************************************************************************)

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

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let ( / ) = Filename.concat

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

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module PString = String
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open Eliom_service
open Eliom_registration

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

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

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

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

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

(* In-memory table, indexed by UUID, contains closures. *)
let election_table = ref SMap.empty

module T = Web_templates

let register_election params web_params =
  let module P = (val params : ELECTION_PARAMS) in
  let uuid = Uuidm.to_string P.params.e_uuid in
  let module D = struct
    module G = P.G
    let election = {
      e_params = P.params;
      e_pks = None;
      e_fingerprint = P.fingerprint;
    }
  end in
  let module P = (val web_params : WEB_PARAMS) in
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  let module W = Web_election.Make (D) (P) (LwtRandom) in
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  let election = (module W : WEB_ELECTION) in
  fun () ->
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    (* starting from here, we do side-effects on the running server *)
    election_table := SMap.add uuid election !election_table;
    election

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

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

lwt () =
  Ocsipersist.iter_step (fun uuid (raw_election, web_params) ->
    let params = Group.election_params_of_string raw_election in
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    let do_register = register_election params web_params in
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    let election = do_register () in
    let module W = (val election : WEB_ELECTION) in
    assert (uuid = Uuidm.to_string W.election.e_params.e_uuid);
    Ocsigen_messages.debug (fun () ->
      Printf.sprintf "Initialized election %s from persistent store" uuid
    );
    return ()
  ) election_ptable

let () = Any.register ~service:home
  (fun () () ->
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    Eliom_reference.unset Web_auth_state.cont >>
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    match_lwt Web_persist.get_main_election () with
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    | None ->
      lwt featured =
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        Web_persist.get_featured_elections () >>=
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        Lwt_list.map_p (fun x -> return @@ SMap.find x !election_table)
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      in
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      T.home ~featured () >>= Html5.send
    | Some x ->
      let module W = (val SMap.find x !election_table : WEB_ELECTION) in
      Redirection.send
        (preapply election_home (W.election.e_params.e_uuid, ()))
  )

let () = Html5.register ~service:admin
  (fun () () ->
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    let cont () = Redirection.send admin in
    Eliom_reference.set Web_auth_state.cont [cont] >>
    lwt site_user = Web_auth_state.get_site_user () in
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    lwt elections =
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      match site_user with
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      | None -> return []
      | Some u ->
        SMap.fold (fun _ w accu ->
          let module W = (val w : WEB_ELECTION) in
          if W.metadata.e_owner = Some u then (
            w :: accu
          ) else (
            accu
          )
        ) !election_table [] |> List.rev |> return
    in
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    lwt setup_elections =
      match site_user with
      | None -> return []
      | Some u ->
         Ocsipersist.fold_step (fun k v accu ->
           if v.se_owner = u
           then return (uuid_of_string k :: accu)
           else return accu
         ) election_stable []
    in
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    T.admin ~elections ~setup_elections ()
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  )

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

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

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

let () = Html5.register ~service:new_election
  (fun () () ->
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    match_lwt Web_auth_state.get_site_user () with
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    | None -> forbidden ()
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    | Some _ -> T.new_election ()
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  )

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

let () = Redirection.register ~service:election_setup_new
  (fun () () ->
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   match_lwt Web_auth_state.get_site_user () with
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   | Some u ->
      let uuid = generate_uuid () in
      let uuid_s = Uuidm.to_string uuid in
      lwt token = generate_token () in
      let se_metadata = {
        e_voting_starts_at = None;
        e_voting_ends_at = None;
        e_owner = Some u;
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        e_auth_config = Some [{auth_system = "password"; auth_instance = "password"; auth_config = []}];
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      } in
      let question = {
        q_answers = [| "Answer 1"; "Answer 2" |];
        q_min = 0;
        q_max = 1;
        q_question = "Question 1?";
      } in
      let se_questions = {
        t_description = "Description of the election.";
        t_name = "Name of the election";
        t_questions = [| question |];
        t_short_name = "short_name";
      } in
      let se = {
        se_owner = u;
        se_group = "{\"g\":\"14887492224963187634282421537186040801304008017743492304481737382571933937568724473847106029915040150784031882206090286938661464458896494215273989547889201144857352611058572236578734319505128042602372864570426550855201448111746579871811249114781674309062693442442368697449970648232621880001709535143047913661432883287150003429802392229361583608686643243349727791976247247948618930423866180410558458272606627111270040091203073580238905303994472202930783207472394578498507764703191288249547659899997131166130259700604433891232298182348403175947450284433411265966789131024573629546048637848902243503970966798589660808533\",\"p\":\"16328632084933010002384055033805457329601614771185955389739167309086214800406465799038583634953752941675645562182498120750264980492381375579367675648771293800310370964745767014243638518442553823973482995267304044326777047662957480269391322789378384619428596446446984694306187644767462460965622580087564339212631775817895958409016676398975671266179637898557687317076177218843233150695157881061257053019133078545928983562221396313169622475509818442661047018436264806901023966236718367204710755935899013750306107738002364137917426595737403871114187750804346564731250609196846638183903982387884578266136503697493474682071\",\"q\":\"61329566248342901292543872769978950870633559608669337131139375508370458778917\"}";
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        se_voters = [];
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        se_questions;
        se_public_keys = [];
        se_metadata;
        se_public_creds = token;
      } in
      lwt () = Ocsipersist.add election_stable uuid_s se in
      lwt () = Ocsipersist.add election_credtokens token uuid_s in
      return (preapply election_setup uuid)
  | None -> forbidden ()
  )

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

let election_setup_mutex = Lwt_mutex.create ()

let handle_setup f cont uuid x =
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  match_lwt Web_auth_state.get_site_user () with
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  | Some u ->
     let uuid_s = Uuidm.to_string uuid in
     Lwt_mutex.with_lock election_setup_mutex (fun () ->
       lwt se = Ocsipersist.find election_stable uuid_s in
       if se.se_owner = u then (
         try_lwt
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           f se x u uuid;
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           Ocsipersist.add election_stable uuid_s se >>
           Redirection.send (preapply cont uuid)
         with e ->
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           T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
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       ) else forbidden ()
     )
  | None -> forbidden ()
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let () =
  Any.register
    ~service:election_setup_group
    (handle_setup
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       (fun se x _ _ ->
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        let _group = Group.of_string x in
        (* we keep it as a string since it contains a type *)
        se.se_group <- x) election_setup)
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let () =
  Any.register
    ~service:election_setup_metadata
    (handle_setup
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       (fun se x u _ ->
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        let metadata = metadata_of_string x in
        if metadata.e_owner <> Some u then failwith "wrong owner";
        se.se_metadata <- metadata) election_setup)
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let () =
  Any.register
    ~service:election_setup_auth
    (handle_setup
       (fun se auth_system _ _ ->
         match auth_system with
         | Some (("dummy" | "password") as auth_system) ->
            se.se_metadata <- {
              se.se_metadata with
                e_auth_config = Some [{
                  auth_system;
                  auth_instance = auth_system;
                  auth_config = []
                }]
            }
         | Some "cas" ->
            se.se_metadata <- {
              se.se_metadata with
                e_auth_config = Some [{
                  auth_system = "cas";
                  auth_instance = "cas";
                  auth_config = ["server", ""];
                }]
            }
         | Some x -> failwith ("unknown authentication system: "^x)
         | None -> failwith "no authentication system was given"
       ) election_setup)

let () =
  Any.register
    ~service:election_setup_auth_cas
    (handle_setup
       (fun se server _ _ ->
         se.se_metadata <- {
           se.se_metadata with
             e_auth_config = Some [{
               auth_system = "cas";
               auth_instance = "cas";
               auth_config = ["server", server];
             }]
         }) election_setup)

let () =
  Any.register
    ~service:election_setup_auth_genpwd
    (handle_setup
       (fun se () _ uuid ->
         let table =
           "password_" ^
           let u = Uuidm.to_string uuid in
           underscorize u
         in
         let table = Ocsipersist.open_table table in
         Lwt_list.iter_s (fun v ->
           lwt salt = generate_token () in
           lwt password = generate_token () in
           let hashed = sha256_hex (salt ^ password) in
           lwt () = Ocsipersist.add table v (salt, hashed) in
           let body =
             "Username: " ^ v ^ "\nPassword: " ^ password ^ "\n"
           in
           let subject =
             "Your password for election " ^ Uuidm.to_string uuid
           in
           lwt () = send_email "noreply@belenios.org" v subject body in
           return ()
         ) se.se_voters) election_setup)

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

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let () =
  Any.register
    ~service:election_setup_questions_post
    (handle_setup
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       (fun se x _ _ ->
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        se.se_questions <- template_of_string x) election_setup_questions)

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

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

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

let () =
  Any.register
    ~service:election_setup_voters_post
    (handle_setup
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       (fun se x _ _ ->
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         let xs = Pcre.split x in
         let () =
           try
             let bad = List.find (fun x -> not (is_email x)) xs in
             Printf.ksprintf failwith "%S is not a valid address" bad
           with Not_found -> ()
         in
         se.se_voters <- xs) election_setup)

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

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

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let () =
  Html5.register
    ~service:election_setup_credentials
    (fun token () ->
     lwt uuid = Ocsipersist.find election_credtokens token in
     lwt se = Ocsipersist.find election_stable uuid in
     T.election_setup_credentials token uuid se ()
    )
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let () =
  File.register
    ~service:election_setup_credentials_download
    ~content_type:"text/plain"
    (fun token () ->
     lwt uuid = Ocsipersist.find election_credtokens token in
     return (!spool_dir / uuid ^ ".public_creds.txt")
    )
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let wrap_handler f =
  try_lwt f ()
  with
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  | e -> T.generic_page ~title:"Error" (Printexc.to_string e) () >>= Html5.send
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let handle_credentials_post token creds =
  lwt uuid = Ocsipersist.find election_credtokens token in
  lwt se = Ocsipersist.find election_stable uuid in
  let module G = (val Group.of_string se.se_group : GROUP) in
  let fname = !spool_dir / uuid ^ ".public_creds.txt" in
  Lwt_mutex.with_lock
    election_setup_mutex
    (fun () ->
     Lwt_io.with_file
       ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
       ~perm:0o600 ~mode:Lwt_io.Output fname
       (fun oc -> Lwt_io.write_chars oc creds)
    ) >>
  lwt () =
    let i = ref 1 in
    Lwt_stream.iter
      (fun x ->
       try
         let x = G.of_string x in
         if not (G.check x) then raise Exit;
         incr i
       with _ ->
         Printf.ksprintf failwith "invalid credential at line %d" !i)
      (Lwt_io.lines_of_file fname)
  in
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  T.generic_page ~title:"Success"
    "Credentials have been received and checked!" () >>= Html5.send
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let () =
  Any.register
    ~service:election_setup_credentials_post
    (fun token creds ->
     let s = Lwt_stream.of_string creds in
     wrap_handler (fun () -> handle_credentials_post token s))
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let () =
  Any.register
    ~service:election_setup_credentials_post_file
    (fun token creds ->
     let s = Lwt_io.chars_of_file creds.Ocsigen_extensions.tmp_filename in
     wrap_handler (fun () -> handle_credentials_post token s))

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module Credgen = struct
  module String = PString

  (* FIXME: duplicate of Tool_credgen *)

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

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

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

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

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

end

let () =
  Any.register
    ~service:election_setup_credentials_server
    (fun uuid () ->
      let uuid_s = Uuidm.to_string uuid in
      lwt se = Ocsipersist.find election_stable uuid_s in
      let module S = Set.Make (PString) in
      let module G = (val Group.of_string se.se_group : GROUP) in
      lwt creds =
        Lwt_list.fold_left_s (fun accu id ->
          lwt cred = Credgen.generate () in
          let priv_cred = derive_cred uuid cred in
          let pub_cred =
            let x = Z.(of_string_base 16 priv_cred mod G.q) in
            let y = G.(g **~ x) in
            G.to_string y
          in
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          let body = "Username: " ^ id ^ "\nCredential: " ^ cred ^ "\n" in
          let subject = "Your credential for election " ^ uuid_s in
          lwt () = send_email "noreply@belenios.org" id subject body in
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          return @@ S.add pub_cred accu
        ) S.empty se.se_voters
      in
      let creds = S.elements creds in
      let fname = !spool_dir / uuid_s ^ ".public_creds.txt" in
      lwt () = 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_list.iter_s (Lwt_io.write_line oc) creds))
      in
      T.generic_page ~title:"Success"
        "Credentials have been generated and mailed!" () >>= Html5.send)

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let () =
  Html5.register
    ~service:election_setup_trustee
    (fun token () ->
     lwt uuid = Ocsipersist.find election_pktokens token in
     lwt se = Ocsipersist.find election_stable uuid in
     T.election_setup_trustee token uuid se ()
    )

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

let () =
  Any.register
    ~service:election_setup_create
    (fun uuid () ->
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     match_lwt Web_auth_state.get_site_user () with
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     | None -> forbidden ()
     | Some u ->
        begin try_lwt
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          let uuid_s = Uuidm.to_string uuid in
          Lwt_mutex.with_lock election_setup_mutex (fun () ->
            lwt se = Ocsipersist.find election_stable uuid_s in
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            if se.se_owner <> u then forbidden () else
            let group = Group.of_string se.se_group in
            let module G = (val group : GROUP) in
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            let module KG = Election.MakeSimpleDistKeyGen (G) (LwtRandom) in
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            (* construct election data in memory *)
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            lwt public_keys, private_key =
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              match se.se_public_keys with
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              | [] ->
                 lwt private_key, public_key = KG.generate_and_prove () in
                 return ([public_key], Some private_key)
              | _ :: _ ->
                 return (List.rev_map
                   (fun (_, r) ->
                     if !r = "" then failwith "some public keys are missing";
                     trustee_public_key_of_string G.read !r
                   ) se.se_public_keys, None)
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            in
            let y = KG.combine (Array.of_list public_keys) in
            let template = se.se_questions in
            let params = {
              e_description = template.t_description;
              e_name = template.t_name;
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              e_public_key = {wpk_group = G.group; wpk_y = y};
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              e_questions = template.t_questions;
              e_uuid = uuid;
              e_short_name = template.t_short_name;
            } in
            let files = {
              f_election = !spool_dir / uuid_s ^ ".election.json";
              f_metadata = !spool_dir / uuid_s ^ ".metadata.json";
              f_public_keys = !spool_dir / uuid_s ^ ".public_keys.jsons";
              f_public_creds = !spool_dir / uuid_s ^ ".public_creds.txt";
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              f_voters = !spool_dir / uuid_s ^ ".voters.txt";
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            } in
            lwt _ =
              try_lwt Lwt_unix.stat files.f_public_creds
              with _ -> failwith "public credentials are missing"
            in
            (* write election files to disk *)
            let create_file fname what =
              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 oc what >> Lwt_io.write oc "\n")
            in
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            create_file files.f_election (string_of_params (write_wrapped_pubkey G.write_group G.write) params) >>
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            create_file files.f_metadata (string_of_metadata se.se_metadata) >>
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            create_file files.f_voters (PString.concat "\n" se.se_voters) >>
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            Lwt_io.with_file
              ~flags:(Unix.([O_WRONLY; O_NONBLOCK; O_CREAT; O_TRUNC]))
              ~perm:0o600
              ~mode:Lwt_io.Output
              files.f_public_keys
              (fun oc ->
               Lwt_list.iter_s
                 (fun pk ->
                  Lwt_io.write oc (string_of_trustee_public_key G.write pk) >>
                  Lwt_io.write oc "\n"
                 ) public_keys
              ) >>
            (* actually create the election *)
            begin match_lwt import_election files with
            | None ->
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               T.new_election_failure `Exists () >>= Html5.send
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            | Some w ->
               let module W = (val w : REGISTRABLE_ELECTION) in
               lwt w = W.register () in
               let module W = (val w : WEB_ELECTION) in
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               (* create file with private key, if any *)
               lwt () =
                 match private_key with
                 | None -> return ()
                 | Some x ->
                    let fname = W.dir / "private_key.json" in
                    create_file fname (string_of_number x)
               in
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               (* clean up temporary files *)
               Lwt_unix.unlink files.f_election >>
               Lwt_unix.unlink files.f_metadata >>
               Lwt_unix.unlink files.f_public_keys >>
               Lwt_unix.unlink files.f_public_creds >>
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               Lwt_unix.unlink files.f_voters >>
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               (* clean up tokens *)
               Ocsipersist.remove election_credtokens se.se_public_creds >>
               Lwt_list.iter_s
                 (fun (token, _) ->
                  Ocsipersist.remove election_pktokens token)
                 se.se_public_keys >>
               Ocsipersist.remove election_stable uuid_s >>
               Redirection.send
                 (preapply election_admin (W.election.e_params.e_uuid, ()))
            end
          )
        with e ->
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          T.new_election_failure (`Exception e) () >>= Html5.send
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        end
    )
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let () =
  Any.register
    ~service:election_home
    (fun (uuid, ()) () ->
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      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      Eliom_reference.unset Web_services.ballot >>
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      let cont () =
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        Redirection.send
          (Eliom_service.preapply
             election_home (W.election.e_params.e_uuid, ()))
      in
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      Eliom_reference.set Web_auth_state.cont [cont] >>
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      match_lwt Eliom_reference.get Web_services.cast_confirmed with
      | Some result ->
         Eliom_reference.unset Web_services.cast_confirmed >>
         T.cast_confirmed (module W) ~result () >>= Html5.send
      | None ->
         lwt state = Web_persist.get_election_state uuid_s in
         T.election_home (module W) state () >>= Html5.send)
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let () =
  Any.register
    ~service:election_set_featured
    (fun (uuid, ()) featured ->
     let uuid_s = Uuidm.to_string uuid in
     lwt () =
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       if featured then Web_persist.add_featured_election uuid_s
       else Web_persist.remove_featured_election uuid_s
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     in
     Redirection.send
       (preapply election_admin (uuid, ())))
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let () =
  Any.register
    ~service:election_admin
    (fun (uuid, ()) () ->
     let uuid_s = Uuidm.to_string uuid in
     let w = SMap.find uuid_s !election_table in
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     lwt site_user = Web_auth_state.get_site_user () in
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     lwt is_featured = Web_persist.is_featured_election uuid_s in
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     let module W = (val w : WEB_ELECTION) in
     let uuid = Uuidm.to_string W.election.e_params.e_uuid in
     match site_user with
     | Some u when W.metadata.e_owner = Some u ->
        lwt state = Web_persist.get_election_state uuid in
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        T.election_admin (module W) ~is_featured state () >>= Html5.send
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       | _ -> forbidden ()
    )
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let () =
  Any.register
    ~service:election_set_state
    (fun (uuid, ()) state ->
     let uuid_s = Uuidm.to_string uuid in
     let w = SMap.find uuid_s !election_table in
     let module W = (val w : WEB_ELECTION) in
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     lwt () =
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       match_lwt Web_auth_state.get_site_user () with
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       | Some u when W.metadata.e_owner = Some u -> return ()
       | _ -> forbidden ()
     in
     lwt () =
       match_lwt Web_persist.get_election_state uuid_s with
       | `Open | `Closed -> return ()
       | _ -> forbidden ()
     in
     let state = if state then `Open else `Closed in
     Web_persist.set_election_state uuid_s state >>
     Redirection.send (preapply election_admin (uuid, ())))
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let () =
  Any.register
    ~service:election_update_credential
    (fun (uuid, ()) () ->
     let uuid_s = Uuidm.to_string uuid in
     let w = SMap.find uuid_s !election_table in
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     lwt site_user = Web_auth_state.get_site_user () in
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     let module W = (val w : WEB_ELECTION) in
     match site_user with
     | Some u ->
        if W.metadata.e_owner = Some u then (
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          T.update_credential (module W) () >>= Html5.send
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        ) else (
          forbidden ()
        )
     | _ -> forbidden ())
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let () =
  Any.register
    ~service:election_update_credential_post
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    (fun (uuid, ()) (old, new_) ->
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     let uuid_s = Uuidm.to_string uuid in
     let w = SMap.find uuid_s !election_table in
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     lwt site_user = Web_auth_state.get_site_user () in
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     let module W = (val w : WEB_ELECTION) in
     match site_user with
     | Some u ->
       if W.metadata.e_owner = Some u then (
         try_lwt
           W.B.update_cred ~old ~new_ >>
           String.send ("OK", "text/plain")
         with Error e ->
           String.send ("Error: " ^ explain_error e, "text/plain")
       ) >>= (fun x -> return @@ cast_unknown_content_kind x)
       else (
         forbidden ()
       )
     | _ -> forbidden ())
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let () =
  Any.register
    ~service:election_vote
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    (fun (uuid, ()) () ->
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      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      Eliom_reference.unset Web_services.ballot >>
      Redirection.send
        (Eliom_service.preapply
           (Eliom_service.static_dir_with_params
              ~get_params:(Eliom_parameter.string "election_url") ())
           (["static"; "vote.html"],
            "../elections/" ^ uuid_s ^ "/")))
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let () =
  Any.register
    ~service:election_cast
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    (fun (uuid, ()) () ->
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      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
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      let cont () =
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        Redirection.send
          (Eliom_service.preapply
             election_cast (W.election.e_params.e_uuid, ()))
      in
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      Eliom_reference.set Web_auth_state.cont [cont] >>
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      match_lwt Eliom_reference.get Web_services.ballot with
      | Some b -> T.cast_confirmation w (sha256_b64 b) () >>= Html5.send
      | None -> T.cast_raw w () >>= Html5.send)
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let () =
  Any.register
    ~service:election_cast_post
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    (fun (uuid, ()) (ballot_raw, ballot_file) ->
      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
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      lwt user = Web_auth_state.get_election_user uuid in
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      lwt the_ballot = match ballot_raw, ballot_file with
        | Some ballot, None -> return ballot
        | None, Some fi ->
           let fname = fi.Ocsigen_extensions.tmp_filename in
           Lwt_stream.to_string (Lwt_io.chars_of_file fname)
        | _, _ -> fail_http 400
      in
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      let cont () =
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        Redirection.send
          (Eliom_service.preapply
             Web_services.election_cast (W.election.e_params.e_uuid, ()))
      in
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      Eliom_reference.set Web_auth_state.cont [cont] >>
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      Eliom_reference.set Web_services.ballot (Some the_ballot) >>
      match user with
      | None ->
         Redirection.send
           (Eliom_service.preapply
              Web_services.election_login
              ((W.election.e_params.e_uuid, ()), None))
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      | Some u -> cont ())
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let () =
  Any.register
    ~service:election_cast_confirm
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    (fun (uuid, ()) () ->
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      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      match_lwt Eliom_reference.get Web_services.ballot with
      | Some the_ballot ->
         begin
           Eliom_reference.unset Web_services.ballot >>
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           match_lwt Web_auth_state.get_election_user uuid with
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           | Some u ->
              let record = string_of_user u, now () in
              lwt result =
                try_lwt
                  lwt hash = W.B.cast the_ballot record in
                  return (`Valid hash)
                with Error e -> return (`Error e)
              in
              Eliom_reference.set Web_services.cast_confirmed (Some result) >>
              Redirection.send
                (Eliom_service.preapply
                   election_home (W.election.e_params.e_uuid, ()))
           | None -> forbidden ()
         end
      | None -> fail_http 404)
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let () =
  Any.register
    ~service:election_pretty_ballots
    (fun ((uuid, ()), start) () ->
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      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      lwt res, _ =
        W.B.Ballots.fold
          (fun h _ (accu, i) ->
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            if i >= start && i < start+50 then
              return (h :: accu, i+1)
            else return (accu, i+1)
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          ) ([], 1)
      in T.pretty_ballots (module W) res () >>= Html5.send)
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let () =
  Any.register
    ~service:election_pretty_ballot
    (fun ((uuid, ()), hash) () ->
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      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      lwt ballot =
        W.B.Ballots.fold
          (fun h b accu ->
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            if h = hash then return (Some b) else return accu
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          ) None
      in
      match ballot with
      | None -> fail_http 404
      | Some b ->
         String.send (b, "application/json") >>=
           (fun x -> return @@ cast_unknown_content_kind x))
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let () =
  Any.register
    ~service:election_tally_trustees
    (fun (uuid, ((), trustee_id)) () ->
      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      lwt () =
        match_lwt Web_persist.get_election_state uuid_s with
        | `EncryptedTally _ -> return ()
        | _ -> fail_http 404
      in
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      lwt pds = Web_persist.get_partial_decryptions uuid_s in
      if List.mem_assoc trustee_id pds then (
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        T.generic_page ~title:"Error"
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          "Your partial decryption has already been received and checked!"
          () >>= Html5.send
      ) else (
        T.tally_trustees w trustee_id () >>= Html5.send
      ))
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let () =
  Any.register
    ~service:election_tally_trustees_post
    (fun (uuid, ((), trustee_id)) partial_decryption ->
      let uuid_s = Uuidm.to_string uuid in
      lwt () =
        match_lwt Web_persist.get_election_state uuid_s with
        | `EncryptedTally _ -> return ()
        | _ -> forbidden ()
      in
      lwt pds = Web_persist.get_partial_decryptions uuid_s in
      lwt () =
        if List.mem_assoc trustee_id pds then forbidden () else return ()
      in
      lwt () =
        if trustee_id > 0 then return () else fail_http 404
      in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      let pks = W.dir / string_of_election_file ESKeys in
      let pks = Lwt_io.lines_of_file pks in
      lwt () = Lwt_stream.njunk (trustee_id-1) pks in
      lwt pk = Lwt_stream.peek pks in
      lwt () = Lwt_stream.junk_while (fun _ -> true) pks in
      lwt pk =
        match pk with
        | None -> fail_http 404
        | Some x -> return x
      in
      let pk = trustee_public_key_of_string W.G.read pk in
      let pk = pk.trustee_public_key in
      let pd = partial_decryption_of_string W.G.read partial_decryption in
      let et = W.dir / string_of_election_file ESETally in
      lwt et = Lwt_io.chars_of_file et |> Lwt_stream.to_string in
      let et = encrypted_tally_of_string W.G.read et in
      if W.E.check_factor et pk pd then (
        let pds = (trustee_id, partial_decryption) :: pds in
        lwt () = Web_persist.set_partial_decryptions uuid_s pds in
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        T.generic_page ~title:"Success"
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          "Your partial decryption has been received and checked!" () >>=
        Html5.send
      ) else (
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        T.generic_page ~title:"Error"
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          "The partial decryption didn't pass validation!" () >>=
        Html5.send
      ))

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let () =
  Any.register
    ~service:election_tally_release
    (fun (uuid, ()) () ->
      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w) in
      lwt () =
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        match_lwt Web_auth_state.get_site_user () with
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        | Some u when W.metadata.e_owner = Some u -> return ()
        | _ -> forbidden ()
      in
      lwt npks, ntallied =
        match_lwt Web_persist.get_election_state uuid_s with
        | `EncryptedTally (npks, ntallied, _) -> return (npks, ntallied)
        | _ -> forbidden ()
      in
      lwt pds = Web_persist.get_partial_decryptions uuid_s in
      lwt pds =
        try
          return @@ Array.init npks (fun i ->
            List.assoc (i+1) pds |> partial_decryption_of_string W.G.read
          )
        with Not_found -> fail_http 404
      in
      lwt et =
        W.dir / string_of_election_file ESETally |>
        Lwt_io.chars_of_file |> Lwt_stream.to_string >>=
        wrap1 (encrypted_tally_of_string W.G.read)
      in
      let result = W.E.combine_factors ntallied et pds in
      lwt () =
        let open Lwt_io in
        with_file
          ~mode:Output (W.dir / string_of_election_file ESResult)
          (fun oc -> Lwt_io.write_line oc (string_of_result W.G.write result))
      in
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      lwt () = Web_persist.set_election_state uuid_s (`Tallied result.result) in
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      Eliom_service.preapply
        election_admin (W.election.e_params.e_uuid, ()) |>
      Redirection.send)

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let content_type_of_file = function
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  | ESRaw | ESKeys | ESBallots | ESETally | ESResult -> "application/json"
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  | ESCreds | ESRecords | ESVoters -> "text/plain"
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let handle_pseudo_file w u f site_user =
  let module W = (val w : WEB_ELECTION) in
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  let confidential =
    match f with
    | ESRaw | ESKeys | ESBallots | ESETally | ESResult | ESCreds -> false
    | ESRecords | ESVoters -> true
  in
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  lwt () =
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    if confidential then (
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      match site_user with
      | Some u when W.metadata.e_owner = Some u -> return ()
      | _ -> forbidden ()
    ) else return ()
  in
  let content_type = content_type_of_file f in
  File.send ~content_type (W.dir / string_of_election_file f)
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let () =
  Any.register
    ~service:election_dir
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    (fun (uuid, f) () ->
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     let uuid_s = Uuidm.to_string uuid in
     let w = SMap.find uuid_s !election_table in
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     lwt site_user = Web_auth_state.get_site_user () in
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     let module W = (val w : WEB_ELECTION) in
     handle_pseudo_file w () f site_user)
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let () =
  Any.register
    ~service:election_compute_encrypted_tally
    (fun (uuid, ()) () ->
      let uuid_s = Uuidm.to_string uuid in
      let w = SMap.find uuid_s !election_table in
      let module W = (val w : WEB_ELECTION) in
      lwt () =
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        match_lwt Web_auth_state.get_site_user () with
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        | Some u when W.metadata.e_owner = Some u -> return ()
        | _ -> forbidden ()
      in
      lwt () =
        match_lwt Web_persist.get_election_state uuid_s with
        | `Closed -> return ()
        | _ -> forbidden ()
      in
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      lwt nb, hash, tally = W.B.compute_encrypted_tally () in
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      let pks = W.dir / string_of_election_file ESKeys in
      let pks = Lwt_io.lines_of_file pks in
      let npks = ref 0 in
      lwt () = Lwt_stream.junk_while (fun _ -> incr npks; true) pks in
      Web_persist.set_election_state uuid_s (`EncryptedTally (!npks, nb, hash)) >>
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      lwt () =
        (* compute partial decryption if the (single) key is known *)
        let skfile = W.dir / "private_key.json" in
        if !npks = 1 && Sys.file_exists skfile then (
          lwt sk = Lwt_io.lines_of_file skfile |> Lwt_stream.to_list in
          let sk = match sk with
            | [sk] -> number_of_string sk
            | _ -> failwith "several private keys are available"
          in
          let tally = encrypted_tally_of_string W.G.read tally in
          lwt pd = W.E.compute_factor tally sk in
          let pd = string_of_partial_decryption W.G.write pd in
          Web_persist.set_partial_decryptions uuid_s [1, pd]