1 files changed, 130 insertions, 0 deletions
diff --git a/packages/web-util/src/forms/converter.ts b/packages/web-util/src/forms/converter.ts
new file mode 100644
index 000000000..eee891776
--- /dev/null
+++ b/packages/web-util/src/forms/converter.ts
@@ -0,0 +1,130 @@
+/*
+ This file is part of GNU Taler
+ (C) 2022-2024 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import {
+  AbsoluteTime,
+  AmountJson,
+  Amounts,
+  TalerExchangeApi,
+} from "@gnu-taler/taler-util";
+import { format, parse } from "date-fns";
+import { StringConverter } from "./FormProvider.js";
+
+export const amlStateConverter = {
+  toStringUI: stringifyAmlState,
+  fromStringUI: parseAmlState,
+};
+
+function stringifyAmlState(s: TalerExchangeApi.AmlState | undefined): string {
+  if (s === undefined) return "";
+  switch (s) {
+    case TalerExchangeApi.AmlState.normal:
+      return "normal";
+    case TalerExchangeApi.AmlState.pending:
+      return "pending";
+    case TalerExchangeApi.AmlState.frozen:
+      return "frozen";
+  }
+}
+
+function parseAmlState(s: string | undefined): TalerExchangeApi.AmlState {
+  switch (s) {
+    case "normal":
+      return TalerExchangeApi.AmlState.normal;
+    case "pending":
+      return TalerExchangeApi.AmlState.pending;
+    case "frozen":
+      return TalerExchangeApi.AmlState.frozen;
+    default:
+      throw Error(`unknown AML state: ${s}`);
+  }
+}
+
+const nullConverter: StringConverter<string> = {
+  fromStringUI(v: string | undefined): string {
+    return v ?? "";
+  },
+  toStringUI(v: unknown): string {
+    return v as string;
+  },
+};
+
+function amountConverter(config: any): StringConverter<AmountJson> {
+  const currency = config["currency"];
+  if (!currency || typeof currency !== "string") {
+    throw Error(`amount converter needs a currency`);
+  }
+  return {
+    fromStringUI(v: string | undefined): AmountJson {
+      // FIXME: requires currency
+      return (
+        Amounts.parse(`${currency}:${v}`) ?? Amounts.zeroOfCurrency(currency)
+      );
+    },
+    toStringUI(v: unknown): string {
+      return v === undefined ? "" : Amounts.stringifyValue(v as AmountJson);
+    },
+  };
+}
+
+function absTimeConverter(config: any): StringConverter<AbsoluteTime> {
+  const pattern = config["pattern"];
+  if (!pattern || typeof pattern !== "string") {
+    throw Error(`absTime converter needs a pattern`);
+  }
+  return {
+    fromStringUI(v: string | undefined): AbsoluteTime {
+      if (v === undefined) {
+        return AbsoluteTime.never();
+      }
+      try {
+        const time = parse(v, pattern, new Date());
+        return AbsoluteTime.fromMilliseconds(time.getTime());
+      } catch (e) {
+        return AbsoluteTime.never();
+      }
+    },
+    toStringUI(v: unknown): string {
+      if (v === undefined) return "";
+      const d = v as AbsoluteTime;
+      if (d.t_ms === "never") return "never";
+      try {
+        return format(d.t_ms, pattern);
+      } catch (e) {
+        return "";
+      }
+    },
+  };
+}
+
+export function getConverterById(
+  id: string | undefined,
+  config: unknown,
+): StringConverter<unknown> {
+  if (id === "Taler.AbsoluteTime") {
+    // @ts-expect-error check this
+    return absTimeConverter(config);
+  }
+  if (id === "Taler.Amount") {
+    // @ts-expect-error check this
+    return amountConverter(config);
+  }
+  if (id === "TalerExchangeApi.AmlState") {
+    // @ts-expect-error check this
+    return amlStateConverter;
+  }
+  return nullConverter as StringConverter<unknown>;
+}