Last updated 2024-10-16

Define keysets

As you learned in Add an administrator account and Define a namespace, keysets determine rules for signing transactions and controlling the accounts that can access and update the namespaces where you deploy smart contracts. This tutorial demonstrates how to define the admin-keyset in the principal namespace that you created in Define a namespace using the public key of the administrative account you created in Add an administrator account.

After you define the admin-keyset in your principal namespace, you'll be able to use it to authorize your administrative account to submit specific types of transactions for the election application you're building. For example, you'll be able to authorize transactions that deploy and upgrade the election smart contract and that nominate the candidates that other accounts can vote on.

Before you begin

Before you start this tutorial, verify the following basic requirements:

You have an internet connection and a web browser installed on your local computer.
You have a code editor, such as Visual Studio Code, access to an interactive terminal shell, and are generally familiar with using command-line programs.
You have cloned the voting-dapp repository to create your project directory as described in Prepare your workspace.
You have the development network running in a Docker container as described in Start a local blockchain.
You are connected to the development network using your local host IP address and port number 8080.
You have created and funded an administrative account as described in Add an administrator account.
You have created a principal namespace on the development network as described in Define a namespace.

Write a transaction to define a keyset

Like the previous tutorial, in this tutorial, you'll write and execute Pact code in the Pact REPL. After testing the transaction to define a keyset in the Pact REPL, you'll define a keyset to use on your local development network.

To define a keyset:

Open the election-dapp/pact folder in the code editor on your computer.
Create a new file named keyset.repl in the pact folder.

Write an empty transaction by typing the following lines of code in the keyset.repl file:

(begin-tx  "Define a new keyset")(commit-tx)

(begin-tx  "Define a new keyset")(commit-tx)

Execute the transaction using the pact command-line program running locally or using pact-cli from the Docker container.

If pact-cli is installed locally, run the following command inside the pact folder in the terminal shell:
```
pact keyset.repl --trace
```
```
pact keyset.repl --trace
```
After you execute the transaction, you should see the following output:
```
keyset.repl:1:0:Trace: Begin Tx 0: Define a new keysetkeyset.repl:4:0:Trace: Commit Tx 0: Define a new keysetLoad successful
```
```
keyset.repl:1:0:Trace: Begin Tx 0: Define a new keysetkeyset.repl:4:0:Trace: Commit Tx 0: Define a new keysetLoad successful
```
As before, if you don't have pact installed locally, you can load the keyset.repl file with the following command:
```
(load "keyset.repl")
```
```
(load "keyset.repl")
```
If you are using the pact-cli in a browser, you can replace the pact keyset.repl --trace command with (load "keyset.repl") throughout this tutorial.

Add functions to define the keyset

Pact has a built-in function—define-keyset—that you can use to define keysets. This function takes two arguments:

The name keyset of the keyset.
The keyset—that is, one or more keys and a predicate—that you want to associate with the keyset name you are defining.

The define-keyset function is wrapped by the expect function to test that calling define-keyset will succeed. The expect function takes three arguments:

The title of the test.
The expected output of the define-keyset function.
The define-keyset function call.

To define a keyset:

Open the election-dapp/pact/keyset.repl file in the code editor on your computer.

Add the following lines of code between the begin-tx and commit-tx lines:

(expect  "A keyset can be defined"  "Keyset defined"  (define-keyset "admin-keyset" (read-keyset 'admin-keyset)))

(expect  "A keyset can be defined"  "Keyset defined"  (define-keyset "admin-keyset" (read-keyset 'admin-keyset)))

Execute the transaction using the pact command-line program:

pact keyset.repl --trace

pact keyset.repl --trace

You'll see that this transaction fails with output similar to the following:

keyset.repl:1:0:Trace: Begin Tx 0: Define a new keysetkeyset.repl:4:0:Trace: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:7:34: No such key in message: admin-keysetkeyset.repl:9:0:Trace: Commit Tx 0: Define a new keysetkeyset.repl:4:0:ExecError: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:7:34: No such key in message: admin-keysetLoad failed

keyset.repl:1:0:Trace: Begin Tx 0: Define a new keysetkeyset.repl:4:0:Trace: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:7:34: No such key in message: admin-keysetkeyset.repl:9:0:Trace: Commit Tx 0: Define a new keysetkeyset.repl:4:0:ExecError: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:7:34: No such key in message: admin-keysetLoad failed

As you saw when defining a namespace, you must load the admin-keyset into the context of the Pact REPL so it can be read using the read-keyset function within the define-keyset function.

Add the following lines at the top of the keyset.repl file:

(env-data  { 'admin-keyset :    { 'keys : [ 'admin-public-key ]    , 'pred : 'keys-all    }  })

(env-data  { 'admin-keyset :    { 'keys : [ 'admin-public-key ]    , 'pred : 'keys-all    }  })

If you execute the transaction now, however, it will fail with the following error:

keyset.repl:20:0:ExecError: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:23:4: Cannot define a keyset outside of a namespaceLoad failed

keyset.repl:20:0:ExecError: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:23:4: Cannot define a keyset outside of a namespaceLoad failed

As this error indicates, keysets must be defined within the context of a specific namespace.

Add the following transaction to define the election namespace before the transaction to define a keyset.

(begin-tx  "Define a namespace to define the keyset in")(define-namespace 'election (read-keyset 'admin-keyset) (read-keyset 'admin-keyset))(commit-tx)

(begin-tx  "Define a namespace to define the keyset in")(define-namespace 'election (read-keyset 'admin-keyset) (read-keyset 'admin-keyset))(commit-tx)

Modify the Define a new keyset transaction to specify the that the keyset is being defined in the context of the election namespace by using the namespace function and by adding election as a prefix for the new keyset with the following lines of code:

(begin-tx  "Define a new keyset")(namespace 'election)(expect  "A keyset can be defined"  "Keyset defined"  (define-keyset "election.admin-keyset" (read-keyset 'admin-keyset)))(commit-tx)

(begin-tx  "Define a new keyset")(namespace 'election)(expect  "A keyset can be defined"  "Keyset defined"  (define-keyset "election.admin-keyset" (read-keyset 'admin-keyset)))(commit-tx)

Execute the transaction using the pact command-line program:

pact keyset.repl --trace

pact keyset.repl --trace

You'll see that this transaction still fails, but with a different error. This time the error message is:

keyset.repl:19:0:ExecError: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:22:2: Keyset failure (keys-all): [admin-pu...]Load failed

keyset.repl:19:0:ExecError: FAILURE: A keyset can be defined: evaluation of actual failed:keyset.repl:22:2: Keyset failure (keys-all): [admin-pu...]Load failed

Sign the transaction with the admin-public-key key from the admin-keyset you loaded into the context of the Pact REPL by adding the following lines of code before the Define a new keyset transaction:
```
(env-sigs  [{ 'key  : 'admin-public-key   , 'caps : []  }])
```
```
(env-sigs  [{ 'key  : 'admin-public-key   , 'caps : []  }])
```

Execute the transaction using the pact command-line program:

pact keyset.repl --trace

pact keyset.repl --trace

You'll now see that the transaction succeeds with output similar to the following:

keyset.repl:1:0:Trace: Setting transaction datakeyset.repl:8:0:Trace: Begin Tx 0: Define a namespace to define the keyset inkeyset.repl:11:2:Trace: Namespace defined: electionkeyset.repl:12:0:Trace: Commit Tx 0: Define a namespace to define the keyset inkeyset.repl:13:0:Trace: Setting transaction signatures/capskeyset.repl:18:0:Trace: Begin Tx 1: Define a new keysetkeyset.repl:21:2:Trace: Namespace set to electionkeyset.repl:22:2:Trace: Expect: success: A keyset can be definedkeyset.repl:26:0:Trace: Commit Tx 1: Define a new keysetLoad successful

keyset.repl:1:0:Trace: Setting transaction datakeyset.repl:8:0:Trace: Begin Tx 0: Define a namespace to define the keyset inkeyset.repl:11:2:Trace: Namespace defined: electionkeyset.repl:12:0:Trace: Commit Tx 0: Define a namespace to define the keyset inkeyset.repl:13:0:Trace: Setting transaction signatures/capskeyset.repl:18:0:Trace: Begin Tx 1: Define a new keysetkeyset.repl:21:2:Trace: Namespace set to electionkeyset.repl:22:2:Trace: Expect: success: A keyset can be definedkeyset.repl:26:0:Trace: Commit Tx 1: Define a new keysetLoad successful

You now have a valid keyset named admin-keyset in the election namespace in the Pact REPL.

Test keyset authorization

The election.admin-keyset you just defined is protected by the admin-keyset that has only one key, the admin-public-key. Only this account is authorized to call the define-keyset function to modify or update the election.admin-keyset definition. Transactions that use any other key will fail.

To test keyset authorization and verify that no other accounts can take control of your namespace, you can add another test case to the keyset.repl file.

To test keyset authorization works as expected:

Open the election-dapp/pact/keyset.repl file in the code editor on your computer.

Add the following lines to the bottom of the keyset.repl file:

(env-data  { 'admin-keyset :    { 'keys : [ 'other-public-key ]    , 'pred : 'keys-all    }  })

(env-data  { 'admin-keyset :    { 'keys : [ 'other-public-key ]    , 'pred : 'keys-all    }  })

These lines establish a different admin-keyset context with a new key for testing a transaction that tries to change the keyset definition.

Sign the transaction with the other-public-key key from the second admin-keyset by adding the following lines of code after the lines changing the context:
```
(env-sigs  [{ 'key  : 'other-public-key   , 'caps : []  }])
```
```
(env-sigs  [{ 'key  : 'other-public-key   , 'caps : []  }])
```

Add a transaction to define a new keyset using the other-public-key in the second admin-keyset and change the expect function to expect-failure with the following lines of code:

(begin-tx  "Define a keyset using a different keyset fails")(namespace 'election)(expect-failure  "keyset definition is already defined using a different keyset"  "Keyset failure (keys-all): 'election.admin-keyset"  (define-keyset "election.admin-keyset" (read-keyset 'admin-keyset)))(commit-tx)

(begin-tx  "Define a keyset using a different keyset fails")(namespace 'election)(expect-failure  "keyset definition is already defined using a different keyset"  "Keyset failure (keys-all): 'election.admin-keyset"  (define-keyset "election.admin-keyset" (read-keyset 'admin-keyset)))(commit-tx)

Execute the transaction using the pact command-line program:

pact keyset.repl --trace

pact keyset.repl --trace

You'll see that the transaction to change the election.admin-keyset fails—as expected—with output similar to the following:

keyset.repl:33:0:Trace: Setting transaction signatures/capskeyset.repl:38:0:Trace: Begin Tx 2: Define a keyset using a different keyset failskeyset.repl:41:2:Trace: Namespace set to electionkeyset.repl:42:2:Trace: Expect failure: success: keyset definition is already defined using a different keysetkeyset.repl:47:2:Trace: Commit Tx 2: Define a keyset using a different keyset failsLoad successful

keyset.repl:33:0:Trace: Setting transaction signatures/capskeyset.repl:38:0:Trace: Begin Tx 2: Define a keyset using a different keyset failskeyset.repl:41:2:Trace: Namespace set to electionkeyset.repl:42:2:Trace: Expect failure: success: keyset definition is already defined using a different keysetkeyset.repl:47:2:Trace: Commit Tx 2: Define a keyset using a different keyset failsLoad successful

This output proves that the election.admin-keyset can only be governed by the account with the admin-public-key and can't be modified by an account that uses a different key.

Rotate the keyset

The previous example illustrated that an unauthorized account can't take control of your namespace. However, it is possible for you to transfer governance permissions to someone else by rotating the election.admin-keyset to use a different key. Keyset rotation can be useful in many situations. For example, if the administrator of an election resigns or retires, you can use keyset rotation to add the signature of a new authorized successor to the original admin-public-key in a new transaction.

To rotate the keyset to accept a new signature:

Open the election-dapp/pact/keyset.repl file in the code editor on your computer.

Add a new signature to the environment by adding the following lines of code after the last transaction that tested unauthorized access:

(env-sigs  [{ 'key  : 'other-public-key   , 'caps : []  }  ,{ 'key  : 'admin-public-key   , 'caps : []  }])

(env-sigs  [{ 'key  : 'other-public-key   , 'caps : []  }  ,{ 'key  : 'admin-public-key   , 'caps : []  }])

Add a new transaction that allows the election.admin-keyset to be modified and is expected to succeed:

(begin-tx  "Rotating the existing keyset to a new keyset works if the transaction is signed with the original admin-public-key")(namespace 'election)(expect  "Keyset can be rotated"  "Keyset defined"  (define-keyset "election.admin-keyset" (read-keyset 'admin-keyset)))(commit-tx)

(begin-tx  "Rotating the existing keyset to a new keyset works if the transaction is signed with the original admin-public-key")(namespace 'election)(expect  "Keyset can be rotated"  "Keyset defined"  (define-keyset "election.admin-keyset" (read-keyset 'admin-keyset)))(commit-tx)

Execute the transaction using the pact command-line program:

pact keyset.repl --trace

pact keyset.repl --trace

You'll see that the transaction to rotate the election.admin-keyset succeeds with output similar to the following:

keyset.repl:49:2:Trace: Setting transaction signatures/capskeyset.repl:57:2:Trace: Begin Tx 3: Rotating the existing keyset to a new keyset works if the transaction is signed with the original admin-public-keykeyset.repl:60:2:Trace: Namespace set to electionkeyset.repl:61:2:Trace: Expect: success: Keyset can be rotatedkeyset.repl:66:2:Trace: Commit Tx 3: Rotating the existing keyset to a new keyset works if the transaction is signed with the original admin-public-keyLoad successful

keyset.repl:49:2:Trace: Setting transaction signatures/capskeyset.repl:57:2:Trace: Begin Tx 3: Rotating the existing keyset to a new keyset works if the transaction is signed with the original admin-public-keykeyset.repl:60:2:Trace: Namespace set to electionkeyset.repl:61:2:Trace: Expect: success: Keyset can be rotatedkeyset.repl:66:2:Trace: Commit Tx 3: Rotating the existing keyset to a new keyset works if the transaction is signed with the original admin-public-keyLoad successful

This output indicates that your test passed and you have successfully rotated the election.admin-keyset to be governed by an admin-keyset that contains the other-public-key signature.

Test your keyset definition

In Define a namespace, you defined a principal namespace for your local development network. In this tutorial, you'll add a keyset definition for your account to govern that principal namespace. As a best practice, you can use the Pact REPL to test the transaction before you submit it on the development network.

To test your keyset definition:

Open the election-dapp/pact/principal-namespace.repl file in the code editor on your computer.

You might remember that this file:
- Loads the public key of the sender00 account and the ns module from the local filesystem into the context of the Pact REPL.
- Creates the principal namespace using the ns-name variable.

Add the following transaction to define the keyset:

(env-sigs  [{ 'key  : "368820f80c324bbc7c2b0610688a7da43e39f91d118732671cd9c7500ff43cca"   , 'caps : []  }])(begin-tx  "Define a keyset in the principal namespace")(expect  "A keyset can be defined in a principal namespace"  "Keyset defined"  (let ((ns-name (ns.create-principal-namespace (read-keyset 'admin-keyset))))    (namespace ns-name)    (define-keyset (format "{}.{}" [ns-name 'admin-keyset]) (read-keyset 'admin-keyset ))  ))(commit-tx)

(env-sigs  [{ 'key  : "368820f80c324bbc7c2b0610688a7da43e39f91d118732671cd9c7500ff43cca"   , 'caps : []  }])(begin-tx  "Define a keyset in the principal namespace")(expect  "A keyset can be defined in a principal namespace"  "Keyset defined"  (let ((ns-name (ns.create-principal-namespace (read-keyset 'admin-keyset))))    (namespace ns-name)    (define-keyset (format "{}.{}" [ns-name 'admin-keyset]) (read-keyset 'admin-keyset ))  ))(commit-tx)

This code:

Adds a signature for the transaction.
Stores the name of the principal namespace in the ns-name variable.
Uses the ns-name variable with the namespace function to enter the principal namespace before calling the define-keyset function.
Uses the define-keyset function to compose the keyset name from the principal namespace name stored in the ns-name variable and the string admin-keyset instead of a hardcoded election.admin-keyset string.

Execute the transaction using the pact command-line program:

pact principal-namespace.repl --trace

pact principal-namespace.repl --trace

You'll see that the transaction succeeds with output similar to the following:

principal-namespace.repl:31:0:Trace: Begin Tx 2: Define a keyset in the principal namespaceprincipal-namespace.repl:34:0:Trace: Expect: success: A keyset can be defined in a principal namespaceprincipal-namespace.repl:42:0:Trace: Commit Tx 2: Define a keyset in the principal namespaceLoad successful

principal-namespace.repl:31:0:Trace: Begin Tx 2: Define a keyset in the principal namespaceprincipal-namespace.repl:34:0:Trace: Expect: success: A keyset can be defined in a principal namespaceprincipal-namespace.repl:42:0:Trace: Commit Tx 2: Define a keyset in the principal namespaceLoad successful

In this example, you defined a keyset in the Pact REPL using the public key for sender00 account. Next, you can define a keyset in your principal namespace on the development network using the administrative account you created in Add an administrator account.

Define a keyset in your principal namespace

Now that you've seen how to use the define-keyset and how to enter your namespace with the namespace functions, you're ready to define a keyset for your principal namespace on the local development network with the administrative account you created using Chainweaver.

To define your keyset on the development network:

Verify the development network is currently running on your local computer.
Open and unlock the Chainweaver desktop or web application and verify that:
- You're connected to development network (devnet) from the network list.
- Your administrative account name with the k: prefix exists on chain 1.
- Your administrative account name is funded with KDA on chain 1.
Open the election-dapp/snippets/define-keyset.ts file in your code editor.

Review the initial client configuration.

As you've seen in other scripts, the define-keyset.ts script imports functions from the Kadena client library and imports configuration information from the configuration.ts file to create a client for interacting with the blockchain:

import { Pact, createClient, isSignedTransaction, signWithChainweaver } from '@kadena/client';import { getApiHost, getChainId, getNetworkId } from './configuration'; const client = createClient(getApiHost());

import { Pact, createClient, isSignedTransaction, signWithChainweaver } from '@kadena/client';import { getApiHost, getChainId, getNetworkId } from './configuration'; const client = createClient(getApiHost());

You must specify your administrative account name as an argument when running the script, so the script displays an error message if the argument isn't provided.

if (!process.argv[2]) {  console.error('Please specify a Kadena account.');}

if (!process.argv[2]) {  console.error('Please specify a Kadena account.');}

Review the main function.

The code to enter the namespace and define the keyset is similar to the code you tested in the principal-namespace.repl file:

async function main(account: string) {  const pactCommand = `    (let ((ns-name (ns.create-principal-namespace (read-keyset 'admin-keyset))))      (namespace ns-name)      (define-keyset (format "{}.{}" [ns-name 'admin-keyset]) (read-keyset 'admin-keyset ))    )  `;

async function main(account: string) {  const pactCommand = `    (let ((ns-name (ns.create-principal-namespace (read-keyset 'admin-keyset))))      (namespace ns-name)      (define-keyset (format "{}.{}" [ns-name 'admin-keyset]) (read-keyset 'admin-keyset ))    )  `;

The remainder of the script creates the transaction, generates the signing request, and awaits the results of the transaction:

  const transaction = Pact.builder    .execution(pactCommand)    .addData('admin-keyset', {      keys: [accountKey(account)],      pred: 'keys-all',    })    .addSigner(accountKey(account))    .setMeta({ chainId: getChainId(), senderAccount: account })    .setNetworkId(getNetworkId())    .createTransaction();   const signedTx = await signWithChainweaver(transaction);   if (isSignedTransaction(signedTx)) {    const transactionDescriptor = await client.submit(signedTx);    const response = await client.listen(transactionDescriptor);    if (response.result.status === 'failure') {      throw response.result.error;    } else {      console.log(response.result);    }  }}

  const transaction = Pact.builder    .execution(pactCommand)    .addData('admin-keyset', {      keys: [accountKey(account)],      pred: 'keys-all',    })    .addSigner(accountKey(account))    .setMeta({ chainId: getChainId(), senderAccount: account })    .setNetworkId(getNetworkId())    .createTransaction();   const signedTx = await signWithChainweaver(transaction);   if (isSignedTransaction(signedTx)) {    const transactionDescriptor = await client.submit(signedTx);    const response = await client.listen(transactionDescriptor);    if (response.result.status === 'failure') {      throw response.result.error;    } else {      console.log(response.result);    }  }}

Open the election-dapp/snippets folder in a terminal shell on your computer.
Create the keyset for your principal namespace using the define-keyset script by running a command similar to the following with your administrative account name:
```
npm run define-keyset:devnet -- k:<your-public-key>
```
```
npm run define-keyset:devnet -- k:<your-public-key>
```
Remember that k:<your-public-key> is the default account name for your administrative account that you funded in Add an administrator account. You can copy this account name from Chainweaver when viewing the account watch list. When you run the script, you should see Chainweaver display a QuickSign Request.
Click Sign All to sign the request.

After you click Sign All, the transaction is executed and the results are displayed in your terminal shell. For example, you should see output similar to the following:
```
{ status: 'success', data: 'Keyset defined' }
```
```
{ status: 'success', data: 'Keyset defined' }
```

You now have a keyset definition that governs your principal namespace on the local development network. This keyset is controlled by the administrative account you created in Chainweaver.

Next steps

In this tutorial, you learned how to:

Define and update a keyset in the Pact REPL.
Test the behavior of keysets before defining a keyset on the blockchain.
Use the Kadena client to define a keyset in your principal namespace on the local development network.

In the next tutorial, you'll create your first Pact module for the election application. You'll define the Pact module inside of your principal namespace and control how it's used with the keyset you defined in this tutorial. After you complete the tutorial, you'll have the basic functionality for the election application website.

To see the code for the activity you completed in this tutorial and get the starter code for the next tutorial, check out the 06-smart-contracts branch from the election-dapp repository by running the following command in your terminal shell:

bash

git checkout 06-smart-contracts

bash

git checkout 06-smart-contracts