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About

The EXM contract below is an example implementation of a contract that uses Internet Computer Protocol ICP for contract's caller authentication (action.caller), empowered by icp-auth atom of icp molecule.

Contract

Prerequisites

  • EXM SDK
npm i -g @execution-machine/sdk

Iteracting with the contract

To register a name in the contract example, you have first to sign with your wallet the message used for verification in the contract's example which is hello world

signature and caller (ICP: rawPublicKey) should be both converted to Uint8Array then encoded in base64 before passing them in to the atom (therefore the example contract input key-value pairs).

Molecule.sh Accept Inputs Format

import { Secp256k1KeyIdentity } from "@dfinity/identity-secp256k1";
// generating identity with a signed message and retreiving rawPublicKey
const identity = Secp256k1KeyIdentity.generate();
const signature = await identity.sign("hello world");
const rawPublicKey = identity.getPublicKey().toRaw();

// molecule.sh accepted input format
const message = btoa("hello world");
const moleculePubKey = btoa(new Uint8Array(rawPublicKey));
const moleculeSig = btoa(new Uint8Array(signature));

// GET http://icp.molecule.sh/icp-auth/{moleculePubKey}/{message}/{moleculeSig}

EXM CLI

exm function:write sAvaOf5cqCoXeF1kJmpEMZ7omjrjsScmcpNlSF_gl10 --input '{"function": "register", "name": "buildooor", "signature": "$ICP_SIGNATURE", "caller": "$ICP_RAW_PUBLIC_KEY"}' --token EXM_TOKEN_ID