From 03835af2d4a0c08d8c7f8a4654e6b39aa6be7875 Mon Sep 17 00:00:00 2001
From: Simon Warta <simon@warta.it>
Date: Wed, 22 Jun 2022 15:42:25 +0200
Subject: [PATCH] Add apiToBigInt

---
 .../tendermint-rpc/src/inthelpers.spec.ts     | 40 +++++++++++++++++++
 packages/tendermint-rpc/src/inthelpers.ts     | 16 ++++++++
 2 files changed, 56 insertions(+)
 create mode 100644 packages/tendermint-rpc/src/inthelpers.spec.ts

diff --git a/packages/tendermint-rpc/src/inthelpers.spec.ts b/packages/tendermint-rpc/src/inthelpers.spec.ts
new file mode 100644
index 00000000..3c2a065e
--- /dev/null
+++ b/packages/tendermint-rpc/src/inthelpers.spec.ts
@@ -0,0 +1,40 @@
+import { apiToBigInt } from "./inthelpers";
+
+describe("inthelpers", () => {
+  describe("apiToBigInt", () => {
+    it("works for positive an negative ints", () => {
+      expect(apiToBigInt("0")).toEqual(BigInt(0));
+      expect(apiToBigInt("1")).toEqual(BigInt(1));
+      expect(apiToBigInt("100")).toEqual(BigInt(100));
+      expect(apiToBigInt("-1")).toEqual(BigInt(-1));
+      expect(apiToBigInt("-100")).toEqual(BigInt(-100));
+      expect(apiToBigInt("9007199254740991")).toEqual(BigInt(9007199254740991));
+      expect(apiToBigInt("-9007199254740991")).toEqual(BigInt(-9007199254740991));
+      // uint64 max
+      expect(apiToBigInt("18446744073709551615")).toEqual(BigInt("18446744073709551615"));
+      // int64 min/max
+      expect(apiToBigInt("-9223372036854775808")).toEqual(BigInt("-9223372036854775808"));
+      expect(apiToBigInt("9223372036854775807")).toEqual(BigInt("9223372036854775807"));
+    });
+
+    it("throws for ill-formatted inputs", () => {
+      // empty
+      expect(() => apiToBigInt("")).toThrowError(/invalid string format/i);
+      expect(() => apiToBigInt("-")).toThrowError(/invalid string format/i);
+
+      // non decimal representation
+      expect(() => apiToBigInt("0x0")).toThrowError(/invalid string format/i);
+      expect(() => apiToBigInt("0x01")).toThrowError(/invalid string format/i);
+      expect(() => apiToBigInt("0x")).toThrowError(/invalid string format/i);
+
+      // decimal points
+      expect(() => apiToBigInt("1.0")).toThrowError(/invalid string format/i);
+
+      // Invalid dashes
+      expect(() => apiToBigInt("1-")).toThrowError(/invalid string format/i);
+      expect(() => apiToBigInt("--1")).toThrowError(/invalid string format/i);
+      expect(() => apiToBigInt("1-1")).toThrowError(/invalid string format/i);
+      expect(() => apiToBigInt("-1-1")).toThrowError(/invalid string format/i);
+    });
+  });
+});
diff --git a/packages/tendermint-rpc/src/inthelpers.ts b/packages/tendermint-rpc/src/inthelpers.ts
index 0219da53..77be2e2e 100644
--- a/packages/tendermint-rpc/src/inthelpers.ts
+++ b/packages/tendermint-rpc/src/inthelpers.ts
@@ -1,5 +1,7 @@
 import { Int53 } from "@cosmjs/math";
 
+import { assertString } from "./tendermint34/encodings";
+
 /**
  * Takes an integer value from the Tendermint RPC API and
  * returns it as number.
@@ -11,6 +13,20 @@ export function apiToSmallInt(input: string | number): number {
   return asInt.toNumber();
 }
 
+/**
+ * Takes an integer value from the Tendermint RPC API and
+ * returns it as BigInt.
+ *
+ * This supports the full uint64 and int64 ranges.
+ */
+export function apiToBigInt(input: string): bigint {
+  assertString(input); // Runtime check on top of TypeScript just to be safe for semi-trusted API types
+  if (!input.match(/^-?[0-9]+$/)) {
+    throw new Error("Invalid string format");
+  }
+  return BigInt(input);
+}
+
 /**
  * Takes an integer in the safe integer range and returns
  * a string representation to be used in the Tendermint RPC API.