Remove helpers

contracts/cw20-merkle-airdrop/Airdrop.ts

@@ -0,0 +1,45 @@
+import keccak256 from 'keccak256';
+import { MerkleTree } from 'merkletreejs';
+
+class Airdrop {
+  private tree: MerkleTree;
+
+  constructor(accounts: Array<{ address: string; amount: string }>) {
+    const leaves = accounts.map((a) => keccak256(a.address + a.amount));
+    this.tree = new MerkleTree(leaves, keccak256, { sort: true });
+  }
+
+  public getMerkleRoot(): string {
+    return this.tree.getHexRoot().replace('0x', '');
+  }
+
+  public getMerkleProof(account: {
+    address: string;
+    amount: string;
+  }): string[] {
+    return this.tree
+      .getHexProof(keccak256(account.address + account.amount))
+      .map((v) => v.replace('0x', ''));
+  }
+
+  public verify(
+    proof: string[],
+    account: { address: string; amount: string }
+  ): boolean {
+    let hashBuf = keccak256(account.address + account.amount);
+
+    proof.forEach((proofElem) => {
+      const proofBuf = Buffer.from(proofElem, 'hex');
+
+      if (hashBuf < proofBuf) {
+        hashBuf = keccak256(Buffer.concat([hashBuf, proofBuf]));
+      } else {
+        hashBuf = keccak256(Buffer.concat([proofBuf, hashBuf]));
+      }
+    });
+
+    return this.getMerkleRoot() === hashBuf.toString('hex');
+  }
+}
+
+export = Airdrop;