signRequest

Signs an HTTP Request and returns a new Request with RFC 9421 signature headers.

Usage

Sign a request by passing the URL (or Request object), an optional RequestInit, a signer, and optional sign options. The function returns a new Request with RFC 9421 signature headers attached.

import { signRequest } from '@slicekit/erc8128'
 
// Simple: just input and signer
const signedRequest = await signRequest(
  'https://api.example.com/resource',
  signer
)
 
// With RequestInit
const signedRequest = await signRequest(
  'https://api.example.com/resource',
  { method: 'POST', body: '{"data": "value"}' },
  signer
)
 
// With options
const signedRequest = await signRequest(
  'https://api.example.com/resource',
  { method: 'POST', body: '{"data": "value"}' },
  signer,
  { ttlSeconds: 300 }
)

Returns

Promise<Request>

A new Request object with these headers added:

• Signature-Input — Components and parameters per RFC 9421
• Signature — Base64-encoded Ethereum signature
• Content-Digest — SHA-256 hash of body (if body is present)

Parameters

Overload 1: Simple

When no RequestInit is needed, pass the input and signer directly.

signRequest(input: RequestInfo, signer: EthHttpSigner, opts?: SignOptions): Promise<Request>

Overload 2: With RequestInit

When you need to specify method, headers, or body, pass a RequestInit as the second argument.

signRequest(input: RequestInfo, init: RequestInit | undefined, signer: EthHttpSigner, opts?: SignOptions): Promise<Request>

input

• Type: RequestInfo

URL string or Request object to sign.

init (optional)

• Type: RequestInit

Optional RequestInit (method, headers, body, etc.).

signer

• Type: EthHttpSigner

The signer that provides the Ethereum address and signing function.

opts (optional)

• Type: SignOptions

Options for customizing the signature.

Examples

Common signing patterns showing TTL customization, custom nonces, and replayable signatures.

const signedRequest = await signRequest(
  'https://api.example.com/resource',
  signer,
  { ttlSeconds: 300 } // Valid for 5 minutes
)