mte/src/api.ml

(* TODO
   number
     - number is "float", but we probably want int everywhere instead
     - numeric values capped at 2^53 -1 inclusive because json
   time
     - better types
     - issues with "never" = uint64_max *)
open Crypto
open Bin_signature

let encode_exn jsont v = Jsont_bytesrw.encode_string jsont v |> Result.get_ok
let encode jsont v = Jsont_bytesrw.encode_string jsont v
let decode jsont v = Jsont_bytesrw.decode_string jsont v

module ErrorDetail = struct
  (* TODO GANA error codes
     https://git.gnunet.org/gana.git/tree/gnu-taler-error-codes/registry.rec *)
  type t = {
    code: int;
    hint: string option;
  }

  let jsont =
    let make code hint = { code; hint } in
    let enc_code v = v.code in
    let enc_hint v = v.hint in
    Jsont.Object.map ~kind:"ErrorDetail" make
    |> Jsont.Object.mem "code" Jsont.int ~enc:enc_code
    |> Jsont.Object.opt_mem "hint" Jsont.(string) ~enc:enc_hint
    |> Jsont.Object.finish
end

module HashCode : sig
  type t

  val hash : string -> t
  val jsont : t Jsont.t
end = struct
  type t = B32.t

  let hash s =
    let open Digestif.SHA512 in
    s |> digest_string |> to_raw_string

  let jsont = Jsont.of_of_string ~kind:"HashCode" B32.decode ~enc:B32.encode
end

module RelativeTime = struct
  type t =
    | Microseconds of float
    | Forever

  let number_or_forever_jsont =
    let forever =
      let dec s =
        match s with
        | "forever" -> Forever
        | _ -> Jsont.Error.msg Jsont.Meta.none "unexpected string value"
      in
      let enc = function Forever -> "forever" | _ -> assert false in
      Jsont.map ~dec ~enc Jsont.string
    in
    let number =
      let dec n = Microseconds n in
      let enc = function Microseconds n -> n | _ -> assert false in
      Jsont.map ~dec ~enc Jsont.number
    in
    let enc = function Forever -> forever | Microseconds _ -> number in
    Jsont.any ~dec_string:forever ~dec_number:number ~enc ()

  let jsont =
    let make t_s = t_s in
    Jsont.Object.map ~kind:"RelativeTime" make
    |> Jsont.Object.mem "t_s" number_or_forever_jsont ~enc:Fun.id
    |> Jsont.Object.finish
end

module RsaDenominationKey = struct
  type t = {
    age_mask: int;
    rsa_pub: RsaPublicKey.t;
  }

  let jsont =
    let make age_mask rsa_pub = { age_mask; rsa_pub } in
    let age_mask v = v.age_mask in
    let rsa_pub v = v.rsa_pub in
    Jsont.Object.map ~kind:"RsaDenominationKey" make
    |> Jsont.Object.mem "age_mask" Jsont.int ~enc:age_mask
    |> Jsont.Object.mem "rsa_pub" RsaPublicKey.jsont ~enc:rsa_pub
    |> Jsont.Object.finish
end

(* ! Clause Schnorr cipher is not supported *)
module CSDenominationKey = struct
  type t = {
    age_mask: int;
    cs_pub: B32.t;
  }

  (* TODO B32.jsont *)
  let b32_jsont = Jsont.of_of_string ~kind:"B32" B32.decode ~enc:B32.encode

  let jsont =
    let make age_mask cs_pub = { age_mask; cs_pub } in
    let age_mask v = v.age_mask in
    let cs_pub v = v.cs_pub in
    Jsont.Object.map ~kind:"CSDenominationKey" make
    |> Jsont.Object.mem "age_mask" Jsont.int ~enc:age_mask
    |> Jsont.Object.mem "cs_pub" b32_jsont ~enc:cs_pub
    |> Jsont.Object.finish
end

module DenominationKey = struct
  type t = Rsa of RsaDenominationKey.t
  (*| CS of CSDenominationKey.t*)

  let to_octets = function Rsa denom -> RsaPublicKey.to_octets denom.rsa_pub

  let of_cs _v =
    Jsont.Error.msg Jsont.Meta.none "CSDenominationKey are not supported"

  let of_rsa v = Rsa v

  let jsont =
    let open Jsont.Object in
    let rsa = Case.map "RSA" RsaDenominationKey.jsont ~dec:of_rsa in
    let cs = Case.map "CS" CSDenominationKey.jsont ~dec:of_cs in
    let enc_case = function Rsa v -> Case.value rsa v in
    let cases = Case.[ make rsa; make cs ] in
    map ~kind:"DenominationKey" Fun.id
    |> case_mem "cipher" Jsont.string ~enc:Fun.id ~enc_case cases
    |> finish
end

module FutureSignKey = struct
  type t = {
    key: EddsaPublicKey.t;
    stamp_start: Timestamp.t;
    stamp_expire: Timestamp.t;
    stamp_end: Timestamp.t;
    signkey_secmod_sig: SigningKeyAnnouncementPS.t;
  }

  let jsont =
    let make key stamp_start stamp_expire stamp_end signkey_secmod_sig =
      { key; stamp_start; stamp_expire; stamp_end; signkey_secmod_sig }
    in
    let key v = v.key in
    let stamp_start v = v.stamp_start in
    let stamp_expire v = v.stamp_expire in
    let stamp_end v = v.stamp_end in
    let signkey_secmod_sig v = v.signkey_secmod_sig in
    let open Jsont.Object in
    map ~kind:"FutureSignKey" make
    |> mem "key" EddsaPublicKey.jsont ~enc:key
    |> mem "stamp_start" Timestamp.jsont ~enc:stamp_start
    |> mem "stamp_expire" Timestamp.jsont ~enc:stamp_expire
    |> mem "stamp_end" Timestamp.jsont ~enc:stamp_end
    |> mem "signkey_secmod_sig" SigningKeyAnnouncementPS.jsont
         ~enc:signkey_secmod_sig
    |> finish
end

module FutureDenom = struct
  type t = {
    section_name: string;
    value: Amount.t;
    stamp_start: Timestamp.t;
    stamp_expire_withdraw: Timestamp.t;
    stamp_expire_deposit: Timestamp.t;
    stamp_expire_legal: Timestamp.t;
    denom_pub: DenominationKey.t;
    fee_withdraw: Amount.t;
    fee_deposit: Amount.t;
    fee_refresh: Amount.t;
    fee_refund: Amount.t;
    denom_secmod_sig: DenominationKeyAnnouncementPS.t;
  }

  let jsont =
    let make section_name value stamp_start stamp_expire_withdraw
        stamp_expire_deposit stamp_expire_legal denom_pub fee_withdraw
        fee_deposit fee_refresh fee_refund denom_secmod_sig =
      {
        section_name;
        value;
        stamp_start;
        stamp_expire_withdraw;
        stamp_expire_deposit;
        stamp_expire_legal;
        denom_pub;
        fee_withdraw;
        fee_deposit;
        fee_refresh;
        fee_refund;
        denom_secmod_sig;
      }
    in
    let section_name t = t.section_name in
    let value t = t.value in
    let stamp_start t = t.stamp_start in
    let stamp_expire_withdraw t = t.stamp_expire_withdraw in
    let stamp_expire_deposit t = t.stamp_expire_deposit in
    let stamp_expire_legal t = t.stamp_expire_legal in
    let denom_pub t = t.denom_pub in
    let fee_withdraw t = t.fee_withdraw in
    let fee_deposit t = t.fee_deposit in
    let fee_refresh t = t.fee_refresh in
    let fee_refund t = t.fee_refund in
    let denom_secmod_sig t = t.denom_secmod_sig in
    let open Jsont.Object in
    map ~kind:"FutureDenom" make
    |> mem "section_name" Jsont.string ~enc:section_name
    |> mem "value" Amount.jsont ~enc:value
    |> mem "stamp_start" Timestamp.jsont ~enc:stamp_start
    |> mem "stamp_expire_withdraw" Timestamp.jsont ~enc:stamp_expire_withdraw
    |> mem "stamp_expire_deposit" Timestamp.jsont ~enc:stamp_expire_deposit
    |> mem "stamp_expire_legal" Timestamp.jsont ~enc:stamp_expire_legal
    |> mem "denom_pub" DenominationKey.jsont ~enc:denom_pub
    |> mem "fee_withdraw" Amount.jsont ~enc:fee_withdraw
    |> mem "fee_deposit" Amount.jsont ~enc:fee_deposit
    |> mem "fee_refresh" Amount.jsont ~enc:fee_refresh
    |> mem "fee_refund" Amount.jsont ~enc:fee_refund
    |> mem "denom_secmod_sig" DenominationKeyAnnouncementPS.jsont
         ~enc:denom_secmod_sig
    |> finish
end

module FutureKeysResponse = struct
  type t = {
    future_denoms: FutureDenom.t list;
    future_signkeys: FutureSignKey.t list;
    master_pub: EddsaPublicKey.t;
    denom_secmod_public_key: EddsaPublicKey.t;
    signkey_secmod_public_key: EddsaPublicKey.t;
  }

  let jsont =
    let make future_denoms future_signkeys master_pub denom_secmod_public_key
        signkey_secmod_public_key =
      {
        future_denoms;
        future_signkeys;
        master_pub;
        denom_secmod_public_key;
        signkey_secmod_public_key;
      }
    in
    let future_denoms t = t.future_denoms in
    let future_signkeys t = t.future_signkeys in
    let master_pub t = t.master_pub in
    let denom_secmod_public_key t = t.denom_secmod_public_key in
    let signkey_secmod_public_key t = t.signkey_secmod_public_key in
    let open Jsont.Object in
    map ~kind:"FutureKeysResponse" make
    |> mem "future_denoms" (Jsont.list FutureDenom.jsont) ~enc:future_denoms
    |> mem "future_signkeys"
         (Jsont.list FutureSignKey.jsont)
         ~enc:future_signkeys
    |> mem "master_pub" EddsaPublicKey.jsont ~enc:master_pub
    |> mem "denom_secmod_public_key" EddsaPublicKey.jsont
         ~enc:denom_secmod_public_key
    |> mem "signkey_secmod_public_key" EddsaPublicKey.jsont
         ~enc:signkey_secmod_public_key
    |> finish
end

module SignKeySignature = struct
  type t = {
    key: EddsaPublicKey.t;
    master_sig: ExchangeSigningKeyValidityPS.t;
  }

  let jsont =
    let make key master_sig = { key; master_sig } in
    let key v = v.key in
    let master_sig v = v.master_sig in
    let open Jsont.Object in
    map ~kind:"SignKeySignature" make
    |> mem "key" EddsaPublicKey.jsont ~enc:key
    |> mem "master_sig" ExchangeSigningKeyValidityPS.jsont ~enc:master_sig
    |> finish
end

module DenomSignature = struct
  type t = {
    h_denom_pub: HashCode.t;
    master_sig: DenominationKeyValidityPS.t;
  }

  let jsont =
    let make h_denom_pub master_sig = { h_denom_pub; master_sig } in
    let h_denom_pub v = v.h_denom_pub in
    let master_sig v = v.master_sig in
    let open Jsont.Object in
    map ~kind:"DenomSignature" make
    |> mem "h_denom_pub" HashCode.jsont ~enc:h_denom_pub
    |> mem "master_sig" DenominationKeyValidityPS.jsont ~enc:master_sig
    |> finish
end

module MasterSignatures = struct
  type t = {
    denom_sigs: DenomSignature.t list;
    signkey_sigs: SignKeySignature.t list;
  }

  let jsont =
    let make denom_sigs signkey_sigs = { denom_sigs; signkey_sigs } in
    let denom_sigs v = v.denom_sigs in
    let signkey_sigs v = v.signkey_sigs in
    let open Jsont.Object in
    map ~kind:"MasterSignatures" make
    |> mem "denom_sigs" (Jsont.list DenomSignature.jsont) ~enc:denom_sigs
    |> mem "signkey_sigs" (Jsont.list SignKeySignature.jsont) ~enc:signkey_sigs
    |> finish
end

module DenomRevocationSignature = struct
  type t = { master_sig: MasterDenominationKeyRevocationPS.t }

  let jsont =
    let make master_sig = { master_sig } in
    let enc v = v.master_sig in
    let open Jsont.Object in
    map ~kind:"DenomRevocationSignature" make
    |> mem "master_sig" MasterDenominationKeyRevocationPS.jsont ~enc
    |> finish
end

module SignkeyRevocationSignature = struct
  type t = { master_sig: MasterSigningKeyRevocationPS.t }

  let jsont =
    let make master_sig = { master_sig } in
    let enc v = v.master_sig in
    let open Jsont.Object in
    map ~kind:"SignkeyRevocationSignature" make
    |> mem "master_sig" MasterSigningKeyRevocationPS.jsont ~enc
    |> finish
end

module AuditorSetupMessage = struct
  type t = {
    auditor_url: string;
    auditor_name: string;
    auditor_pub: EddsaPublicKey.t;
    master_sig: MasterAddAuditorPS.t;
    (* TODO time
       something about using monotonic system time here! *)
    validity_start: Timestamp.t;
  }

  let jsont =
    let make auditor_url auditor_name auditor_pub master_sig validity_start =
      { auditor_url; auditor_name; auditor_pub; master_sig; validity_start }
    in
    let auditor_url v = v.auditor_url in
    let auditor_name v = v.auditor_name in
    let auditor_pub v = v.auditor_pub in
    let master_sig v = v.master_sig in
    let validity_start v = v.validity_start in
    let open Jsont.Object in
    map ~kind:"AuditorSetupMessage" make
    |> mem "auditor_url" Jsont.string ~enc:auditor_url
    |> mem "auditor_name" Jsont.string ~enc:auditor_name
    |> mem "auditor_pub" EddsaPublicKey.jsont ~enc:auditor_pub
    |> mem "master_sig" MasterAddAuditorPS.jsont ~enc:master_sig
    |> mem "validity_start" Timestamp.jsont ~enc:validity_start
    |> finish
end

module AuditorTeardownMessage = struct
  type t = {
    master_sig: MasterDelAuditorPS.t;
    (* TODO time
       something about using monotonic system time here! *)
    validity_end: Timestamp.t;
  }

  let jsont =
    let make master_sig validity_end = { master_sig; validity_end } in
    let master_sig v = v.master_sig in
    let validity_end v = v.validity_end in
    let open Jsont.Object in
    map ~kind:"AuditorTeardownMessage" make
    |> mem "master_sig" MasterDelAuditorPS.jsont ~enc:master_sig
    |> mem "validity_end" Timestamp.jsont ~enc:validity_end
    |> finish
end

module WireFeeSetupMessage = struct
  type t = {
    wire_method: string;
    (* TODO over which struct?
       Signature using the exchange's offline key
       with purpose TALER_SIGNATURE_MASTER_WIRE_FEES *)
    master_sig_wire: EddsaSignature.t;
    fee_start: Amount.t;
    fee_end: Amount.t;
    closing_fee: Amount.t;
    wire_fee: Amount.t;
  }

  let jsont =
    let make wire_method master_sig_wire fee_start fee_end closing_fee wire_fee
        =
      {
        wire_method;
        master_sig_wire;
        fee_start;
        fee_end;
        closing_fee;
        wire_fee;
      }
    in
    let wire_method v = v.wire_method in
    let master_sig_wire v = v.master_sig_wire in
    let fee_start v = v.fee_start in
    let fee_end v = v.fee_end in
    let closing_fee v = v.closing_fee in
    let wire_fee v = v.wire_fee in
    let open Jsont.Object in
    map ~kind:"WireFeeSetupMessage" make
    |> mem "wire_method" Jsont.string ~enc:wire_method
    |> mem "master_sig_wire" EddsaSignature.jsont ~enc:master_sig_wire
    |> mem "fee_start" Amount.jsont ~enc:fee_start
    |> mem "fee_end" Amount.jsont ~enc:fee_end
    |> mem "closing_fee" Amount.jsont ~enc:closing_fee
    |> mem "wire_fee" Amount.jsont ~enc:wire_fee
    |> finish
end

module GlobalFees = struct
  type t = {
    start_date: Timestamp.t;
    end_date: Timestamp.t;
    history_fee: Amount.t;
    account_fee: Amount.t;
    purse_fee: Amount.t;
    history_expiration: RelativeTime.t;
    purse_account_limit: int;
    purse_timeout: RelativeTime.t;
    (* Signature of TALER_GlobalFeesPS. *)
    master_sig: GlobalFeesPS.t;
  }

  let jsont =
    let make start_date end_date history_fee account_fee purse_fee
        history_expiration purse_account_limit purse_timeout master_sig =
      {
        start_date;
        end_date;
        history_fee;
        account_fee;
        purse_fee;
        history_expiration;
        purse_account_limit;
        purse_timeout;
        master_sig;
      }
    in
    let start_date v = v.start_date in
    let end_date v = v.end_date in
    let history_fee v = v.history_fee in
    let account_fee v = v.account_fee in
    let purse_fee v = v.purse_fee in
    let history_expiration v = v.history_expiration in
    let purse_account_limit v = v.purse_account_limit in
    let purse_timeout v = v.purse_timeout in
    let master_sig v = v.master_sig in
    let open Jsont.Object in
    map ~kind:"GlobalFees" make
    |> mem "start_date" Timestamp.jsont ~enc:start_date
    |> mem "end_date" Timestamp.jsont ~enc:end_date
    |> mem "history_fee" Amount.jsont ~enc:history_fee
    |> mem "account_fee" Amount.jsont ~enc:account_fee
    |> mem "purse_fee" Amount.jsont ~enc:purse_fee
    |> mem "history_expiration" RelativeTime.jsont ~enc:history_expiration
    |> mem "purse_account_limit" Jsont.int ~enc:purse_account_limit
    |> mem "purse_timeout" RelativeTime.jsont ~enc:purse_timeout
    |> mem "master_sig" GlobalFeesPS.jsont ~enc:master_sig
    |> finish
end