offline tool: add drain cmd

tools/offline.ml

@@ -13,6 +13,11 @@ module Arg = struct
     Arg.Conv.make ~docv:"relative time argument"
       ~parser:Timestamp.Span.of_string ~pp:Timestamp.Span.pp ()
 
+  let b32 =
+    let pp fmt v = Fmt.pf fmt "%s" (B32.encode v) in
+    Arg.Conv.make ~docv:"Crockford's Base32 encoded argument" ~parser:B32.decode
+      ~pp ()
+
   let amount =
     Arg.Conv.make ~docv:"amount argument" ~parser:Amount.of_string ~pp:Amount.pp
       ()
@@ -224,6 +229,32 @@ let global_fees_cmd =
     ~account_fee ~purse_fee ~history_expiration ~purse_account_limit
     ~purse_timeout
 
+let drain_cmd =
+  let doc =
+    "Drain profits from the exchange. The actual drain requires running the \
+     taler-exchange-drain tool."
+  in
+  let debit_account_section =
+    Arg.(required & opt (some string) None & info [ "debit_account_section" ])
+  in
+  let credit_payto_uri =
+    Arg.(required & opt (some string) None & info [ "credit_payto_uri" ])
+  in
+  let wtid = Arg.(required & opt (some b32) None & info [ "wtid" ]) in
+  let date = Arg.(required & opt (some timestamp) None & info [ "date" ]) in
+  let amount = Arg.(required & opt (some amount) None & info [ "amount" ]) in
+  Cmd.make (Cmd.info "drain" ~doc)
+  @@
+  let+ output = output
+  and+ master_key = master_key
+  and+ debit_account_section = debit_account_section
+  and+ credit_payto_uri = credit_payto_uri
+  and+ wtid = wtid
+  and+ date = date
+  and+ amount = amount in
+  drain ~output ~master_key ~debit_account_section ~credit_payto_uri ~wtid ~date
+    ~amount
+
 let cli =
   let info =
     let doc = "MTE Offline CLI tool" in
@@ -241,6 +272,7 @@ let cli =
       disable_auditor_cmd;
       wire_fee_cmd;
       global_fees_cmd;
+      drain_cmd;
     ]
 
 let main () = Cmd.eval_result cli
@@ -253,6 +285,8 @@ let () = if !Sys.interactive then () else exit (main ())
        -> how to build WireSetupMessage?
           we need additional data to craft master_sig
           maybe supposed to be found in the full payto-uri?
-     /management/drain
+
      /management/aml-officers
-     /management/partners *)
+       -> /aml
+     /management/partners
+       -> /wads *)

tools/offline_impl.ml

@@ -197,3 +197,33 @@ let wire_fee ~output ~master_key ~wire_method ~fee_start ~fee_end ~closing_fee
   let* s = Api.encode Api.WireFeeSetupMessage.jsont v in
   let* () = write_file output s in
   Ok ()
+
+let drain ~output ~master_key ~debit_account_section ~credit_payto_uri ~wtid
+    ~date ~amount =
+  let open Crypto in
+  let* key = read_master_key_file master_key in
+  let master_sig =
+    let open Bin_sig.MasterDrainProfit in
+    sign_f ~f:(EddsaSignature.sign ~key)
+      {
+        wtid;
+        date;
+        amount;
+        h_section= Bin_type.Hash_64_cstr.hash debit_account_section;
+        h_payto= Bin_type.FullPaytoHash.hash credit_payto_uri;
+      }
+  in
+  let v =
+    Api.DrainProfitsMessage.
+      {
+        debit_account_section;
+        credit_payto_uri;
+        wtid;
+        master_sig;
+        date;
+        amount;
+      }
+  in
+  let* s = Api.encode Api.DrainProfitsMessage.jsont v in
+  let* () = write_file output s in
+  Ok ()