authorization

Creates an authorization function for use in transactions.

An authorization function must produce the information of the user that is going to sign and a signing function to use the information to produce a signature.

Read more about authorization functions and transaction roles.

Import

You can import the entire package and access the function:

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import * as fcl from '@onflow/fcl';

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fcl.authorization(addr, signingFunction, keyId, sequenceNum);

Or import directly the specific function:

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import { authorization } from '@onflow/fcl';

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authorization(addr, signingFunction, keyId, sequenceNum);

Usage

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import * as fcl from '@onflow/fcl';

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import { ec as EC } from 'elliptic';

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// Create a signing function

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const signingFunction = ({ message }) => {

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// Your signing logic here

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return {

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addr: '0x123456789abcdef0',

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keyId: 0,

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signature: 'your_signature_here',

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};

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};

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// Create authorization

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const authz = fcl.authorization(

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'0x123456789abcdef0', // account address

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signingFunction, // signing function

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0, // key ID

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42, // sequence number

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);

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// Use in transaction

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await fcl.mutate({

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cadence: `transaction { prepare(acct: AuthAccount) {} }`,

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proposer: authz,

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payer: authz,

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authorizations: [authz],

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});

Parameters

addr

• Type: string
• Description: The address of the account that will sign the transaction

signingFunction

• Type:

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type SigningFn = (

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signable?: SignableMessage,

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) => SigningResult | Promise<SigningResult>;

• Description: A function that produces signatures for the account

keyId (optional)

• Type: string | number
• Description: The index of the key to use for signing (optional)

sequenceNum (optional)

• Type: number
• Description: The sequence number for the account key (optional)

Returns

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Partial<InteractionAccount>;

A partial interaction account object

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