From fdd25a65118170c07c4fff6cdfdb69dc94eb2585 Mon Sep 17 00:00:00 2001
From: mhchia <kevin.mh.chia@gmail.com>
Date: Sat, 16 Sep 2023 16:13:45 +0800
Subject: [PATCH] approve only when allowance is not enough

---
 src/contract-wrapper.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/contract-wrapper.ts b/src/contract-wrapper.ts
index 1caa4240..aee05ca9 100644
--- a/src/contract-wrapper.ts
+++ b/src/contract-wrapper.ts
@@ -180,8 +180,11 @@ export class RLNContract {
       erc20ABI,
       this.getContractRunner(),
     )
-    const txApprove = await tokenContract.approve(rlnContractAddress, amount)
-    await txApprove.wait()
+    const allowance = await tokenContract.allowance(await this.getSignerAddress(), rlnContractAddress)
+    if (allowance < amount) {
+      const txApprove = await tokenContract.approve(rlnContractAddress, amount)
+      await txApprove.wait()
+    }
     const txRegister = await this.rlnContract.register(identityCommitment, amount)
     const receipt = await txRegister.wait()
     return receipt