Lambda Quickstart

This quick start guide will walk you through how to quickly get setup with the Passport SDK, register and authenticate users, and start signing messages and transactions. You can skip to the Complete Setup, and then follow the section step-by-step where each code snippet will be explained. You can also quickly pull the completed repository here https://github.com/0xpass/lambda-quickstart and follow along.

For a deep dive into exactly how Lambda's work and are structured, you can follow theOverview guide, alongside the quickstart.

Project setup

First we'll setup a Next.js project, with tailwind, we can do this with the following command, and walk through the configuration wizard, making sure to chose the app-router, and tailwind.

npx create-next-app@latest

Setup and Dependencies

Firstly, we'll ensure we have all the requires dependencies. So we're going to install the Passport SDK @0xpass/passport to interact with Passport protocol to create and execute our Lambda, and @0xpass/webauthn-signer to handle our passkey registration and authentication, finally @textea/json-viewer so that we can better see our lambda config in the UI.

npm install @0xpass/passport @0xpass/webauthn-signer @textea/json-viewer

Firstly let's setup a usePassport hook, which gives us an easy way to access our Passport instance.

import { useRef } from "react";
import { WebauthnSigner } from "@0xpass/webauthn-signer";
import { Network, Passport } from "@0xpass/passport";

export function usePassport(scopeId: string) {
  const signerRef = useRef<WebauthnSigner | null>(null);
  const passportRef = useRef<Passport | null>(null);

  if (!signerRef.current) {
    signerRef.current = new WebauthnSigner({
      rpId: process.env.NEXT_PUBLIC_RP_ID!,
      rpName: "0xPass",
    });
  }

  if (!passportRef.current) {
    passportRef.current = new Passport({
      scopeId: scopeId,
      signer: signerRef.current,
      network: Network.TESTNET,
    });
  }

  return {
    passport: passportRef.current,
    signer: signerRef.current,
  };
}

Now in our page.tsx we can setup our state variables for, tracking registering, and authenticating users. We'll also use our Passport and WebauthnSigner instances, from the hook we just created. as well as our Alchemy url and a fallback provider, which we'll make use of when we want to signMessages with our WalletClient.

"use client";
import { Fragment, useState } from "react";
import { usePassport } from "./hooks/usePassport";
import dynamic from "next/dynamic";

const JsonViewer = dynamic(
  () => import("@textea/json-viewer").then((mod) => mod.JsonViewer),
  { ssr: false }
);

export default function Page() {
  const [username, setUsername] = useState("");
  const [authenticated, setAuthenticated] = useState(false);
  const [authenticating, setAuthenticating] = useState(false);
  const [registering, setRegistering] = useState(false);
  const [authenticateSetup, setAuthenticateSetup] = useState(false);

  const [createLambdaLoading, setCreateLambdaLoading] = useState(false);
  const [lambdaListLoading, setlambdaListLoading] = useState(false);
  const [executeLambdaLoading, setExecuteLambdaLoading] = useState(false);
  const [stateLambdaId, setStateLambdaId] = useState<null | string>(null);
  const [lambdaList, setLambdaList] = useState<null | [any]>();
  const [selectedLambdaId, setSelectedLambdaId] = useState<null | string>(null);

  const [lambdaId, setLambdaId] = useState("");
  const [address, setAddress] = useState<string>();

  const userInput = {
    username: username,
    userDisplayName: username,
  };


  const { passport } = usePassport("07907e39-63c6-4b0b-bca8-377d26445172");

We use a useRef so that a new instance of WebauthnSigner and Passport aren't re-created during re-renders.

So we set up the functions for these as follows, we setup the register , authenticate

const lambdaConfig = {
    authorization: {
      type: "none" as "none",
    },
    verifications: {
      count: 1,
    },
    envs: [],
    max_executions: 0,
    conditions: [
      {
        type: "code" as const,
        code: "if (Math.random() < 0.5) { return true; } else { return false; }",
        output_type: "integer" as const,
        substitution: true,
      },
    ],
    triggers: [],
    actions: {
      type: "personal_sign" as const,
      check: "",
      data: "0x000000",
      substitution: true,
    },
    postHook: [],
  };

  async function listLambdas() {
    setlambdaListLoading(true);
    try {
      const lambdas = await passport.listLambda();
      setLambdaList(lambdas.result);
      console.log(lambdas.result);
    } catch (err) {
      console.log(err);
    } finally {
      setlambdaListLoading(false);
    }
  }

  async function createLambda() {
    setCreateLambdaLoading(true);
    try {
      const result = await passport.createLambda({
        data: lambdaConfig,
      });

      console.log(result);

      alert(JSON.stringify(result.result));
    } catch (err) {
      console.log(err);
    } finally {
      setCreateLambdaLoading(false);
    }
  }

  async function executeLambda() {
    setExecuteLambdaLoading(true);
    try {
      const params = {
        data: {
          id: lambdaId ? lambdaId : stateLambdaId!,
          params: [],
        },
      };
      const result = await passport.executeLambda(params);
      if (result.result === "Condition not met") {
        alert("Ooops, probability wasn't on your side...");
      } else {
        alert(
          "Successful Signature Attempt:: " + JSON.stringify(result.result)
        );
      }
    } catch (err) {
      console.log(err);
    } finally {
      setExecuteLambdaLoading(false);
    }
  }

  async function register() {
    setRegistering(true);
    try {
      await passport.setupEncryption();
      const res = await passport.register(userInput);
      console.log(res);

      if (res.result.account_id) {
        setRegistering(false);
        setAuthenticating(true);
        await authenticate();
        setAuthenticating(false);
      }
    } catch (error) {
      console.error("Error registering:", error);
    } finally {
      setRegistering(false);
      setAuthenticating(false);
    }
  }

  async function authenticate() {
    setAuthenticating(true);
    try {
      await passport.setupEncryption();
      const [_, address] = await passport.authenticate(userInput)!;

      console.log(address);
      setAddress(address);
      setAuthenticated(true);
    } catch (error) {
      console.error("Error registering:", error);
    } finally {
      setAuthenticating(false);
    }
  }

Complete Setup

Now with all of this setup we can setup our UI too, so the overall setup looks as below. In the final part of our setup, we've created the UI layer to interact with the above functions. We have buttons to register and authenticate, which dynamically interact with the state, to show loading states, as well as authenticated states. We also have our lambda configuration, as well as a list of toggle-able lambda's that we create where we can see more about their details, whether they've been executed, how many times they've been executed, etc.

"use client";
import { Fragment, useState } from "react";
import { usePassport } from "./hooks/usePassport";
import dynamic from "next/dynamic";

const JsonViewer = dynamic(
  () => import("@textea/json-viewer").then((mod) => mod.JsonViewer),
  { ssr: false }
);

export default function Page() {
  const [username, setUsername] = useState("");
  const [authenticated, setAuthenticated] = useState(false);
  const [authenticating, setAuthenticating] = useState(false);
  const [registering, setRegistering] = useState(false);
  const [authenticateSetup, setAuthenticateSetup] = useState(false);

  const [createLambdaLoading, setCreateLambdaLoading] = useState(false);
  const [lambdaListLoading, setlambdaListLoading] = useState(false);
  const [executeLambdaLoading, setExecuteLambdaLoading] = useState(false);
  const [stateLambdaId, setStateLambdaId] = useState<null | string>(null);
  const [lambdaList, setLambdaList] = useState<null | [any]>();
  const [selectedLambdaId, setSelectedLambdaId] = useState<null | string>(null);

  const [lambdaId, setLambdaId] = useState("");
  const [address, setAddress] = useState<string>();

  const userInput = {
    username: username,
    userDisplayName: username,
  };

  const { passport } = usePassport("07907e39-63c6-4b0b-bca8-377d26445172");

  const lambdaConfig = {
    authorization: {
      type: "none" as "none",
    },
    verifications: {
      count: 1,
    },
    envs: [],
    max_executions: 0,
    conditions: [
      {
        type: "code" as const,
        code: "if (Math.random() < 0.5) { return true; } else { return false; }",
        output_type: "integer" as const,
        substitution: true,
      },
    ],
    triggers: [],
    actions: {
      type: "personal_sign" as const,
      check: "",
      data: "0x000000",
      substitution: true,
    },
    postHook: [],
  };

  async function listLambdas() {
    setlambdaListLoading(true);
    try {
      const lambdas = await passport.listLambda();
      setLambdaList(lambdas.result);
      console.log(lambdas.result);
    } catch (err) {
      console.log(err);
    } finally {
      setlambdaListLoading(false);
    }
  }

  async function createLambda() {
    setCreateLambdaLoading(true);
    try {
      const result = await passport.createLambda({
        data: lambdaConfig,
      });

      console.log(result);

      alert(JSON.stringify(result.result));
    } catch (err) {
      console.log(err);
    } finally {
      setCreateLambdaLoading(false);
    }
  }

  async function executeLambda() {
    setExecuteLambdaLoading(true);
    try {
      const params = {
        data: {
          id: lambdaId ? lambdaId : stateLambdaId!,
          params: [],
        },
      };
      const result = await passport.executeLambda(params);
      if (result.result === "Condition not met") {
        alert("Ooops, probability wasn't on your side...");
      } else {
        alert(
          "Successful Signature Attempt:: " + JSON.stringify(result.result)
        );
      }
    } catch (err) {
      console.log(err);
    } finally {
      setExecuteLambdaLoading(false);
    }
  }

  async function register() {
    setRegistering(true);
    try {
      await passport.setupEncryption();
      const res = await passport.register(userInput);
      console.log(res);

      if (res.result.account_id) {
        setRegistering(false);
        setAuthenticating(true);
        await authenticate();
        setAuthenticating(false);
      }
    } catch (error) {
      console.error("Error registering:", error);
    } finally {
      setRegistering(false);
      setAuthenticating(false);
    }
  }

  async function authenticate() {
    setAuthenticating(true);
    try {
      await passport.setupEncryption();
      const [_, address] = await passport.authenticate(userInput)!;

      console.log(address);
      setAddress(address);
      setAuthenticated(true);
    } catch (error) {
      console.error("Error registering:", error);
    } finally {
      setAuthenticating(false);
    }
  }

  return (
    <div className="flex flex-col items-center justify-center min-h-screen py-2 bg-white text-black">
      <div
        className={`text-2xl font-bold mb-8 ${
          authenticated ? "text-green-500" : "text-red-500"
        }`}
      >
        {authenticated ? "Authenticated" : "Not authenticated"}
      </div>
      <div className="text-center">
        <h1 className="text-3xl font-bold underline">
          Passport Lambda Quickstart
        </h1>
        <p className="mt-2 text-lg">
          This is a quickstart guide for Passport Lambda's
          {authenticated ? (
            <p className="text-xs text-center mt-8 max-w-[100ch] mb-10">
              You can create executable lambda's based on your lambda config
              below, once you create a lambda you can either execute your active
              'state' lambda, or list your lambda ID's to pick an ID to execute.
              You can click the lambda ids to, toggle the lambda's to see their
              full configuration and status', you'll need to click 'list
              lambdas' again to see any updates after execution
            </p>
          ) : (
            <p className="text-xs mt-8">
              Register / Sign In to start playing aroud with Passport Lambda's
            </p>
          )}
        </p>

        <div className="mt-4 space-y-4">
          {authenticated ? (
            <>
              <div className="flex flex-col mb-12">
                <div className="flex items-center justify-center space-x-6">
                  <div className="font-bold">Address</div>
                  <div>{address}</div>
                </div>
              </div>

              <div className="flex flex-row">
                <div className="w-full">
                  <JsonViewer
                    displayDataTypes={false}
                    theme="light"
                    displaySize={true}
                    rootName={false}
                    value={lambdaConfig}
                  />
                </div>

                <div className="flex flex-col w-full">
                  <div className="mb-3 space-y-2">
                    {lambdaList?.map((lambda) => (
                      <Fragment key={lambda.id}>
                        <div
                          className="text-sm cursor-pointer"
                          onClick={() =>
                            setSelectedLambdaId(
                              selectedLambdaId === lambda.id ? null : lambda.id
                            )
                          }
                        >
                          {lambda.id}
                        </div>
                        {selectedLambdaId === lambda.id && (
                          <JsonViewer
                            displayDataTypes={false}
                            theme="light"
                            defaultInspectDepth={0}
                            displaySize={true}
                            rootName={false}
                            value={lambda}
                          />
                        )}
                      </Fragment>
                    ))}
                  </div>
                  <button
                    onClick={async () => await listLambdas()}
                    className="border border-1 rounded p-2 border-black mb-4 ml-2"
                  >
                    {lambdaListLoading ? "Listing Lambdas..." : "List Lambdas"}
                  </button>

                  <button
                    onClick={async () => await createLambda()}
                    disabled={createLambdaLoading}
                    className="border border-1 rounded p-2 border-black mb-4 ml-2"
                  >
                    {createLambdaLoading
                      ? "Creating Lambda..."
                      : "Create Lambda"}
                  </button>

                  <input
                    value={lambdaId}
                    onChange={(e) => setLambdaId(e.target.value)}
                    className="border border-1 rounded p-2 border-black mb-4 ml-2 text-center"
                    placeholder="Lambda to Execute"
                  />

                  <button
                    onClick={async () => await executeLambda()}
                    disabled={executeLambdaLoading}
                    className="border border-1 rounded p-2 border-black mb-4 ml-2"
                  >
                    {executeLambdaLoading
                      ? "Executing Lambda..."
                      : "Execute Lambda"}
                  </button>
                </div>
              </div>
            </>
          ) : (
            <form
              onSubmit={async (e) => {
                e.preventDefault();
                if (authenticateSetup) {
                  await authenticate();
                } else {
                  register();
                }
              }}
            >
              <div className="mb-12 flex flex-col space-y-2 mt-8">
                <input
                  value={username}
                  onChange={(e) => setUsername(e.target.value)}
                  className="border border-1 rounded p-2 border-black mb-4 ml-2 text-center"
                  placeholder="Enter unique username"
                />
                <button
                  className="border border-1 rounded p-2 border-black mb-4 ml-2"
                  type="submit"
                  disabled={registering || authenticating}
                >
                  {authenticateSetup
                    ? authenticating
                      ? "Authenticating..."
                      : "Authenticate"
                    : registering
                    ? "Registering..."
                    : authenticating
                    ? "Authenticating..."
                    : "Register"}
                </button>

                <span
                  onClick={() => setAuthenticateSetup(!authenticateSetup)}
                  className="cursor-pointer"
                >
                  {authenticateSetup
                    ? "Register a Passkey?"
                    : "Already have a passkey?"}
                </span>
              </div>
            </form>
          )}
        </div>
      </div>
    </div>
  );
}

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