2.5.0

.editorconfig

@@ -4,7 +4,12 @@ root = true
 end_of_line = lf
 insert_final_newline = false
 
-[src/**/*.ts]
+[{src,tests}/*.ts]
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+[{src,tests}/**/*.ts]
 charset = utf-8
 indent_style = space
 indent_size = 4

README.md

@@ -84,11 +84,13 @@ Signs a payload and returns the token.
 
 #### Arguments
 
-Argument    | Type     | Status   | Default | Description
------------ | -------- | -------- | ------- | -----------
-`payload`   | `object` | required | -       | The payload object. To use `nbf` (Not Before) and/or `exp` (Expiration Time) add `nbf` and/or `exp` to the payload.
-`secret`    | `string` | required | -       | A string which is used to sign the payload.
-`options`   | `object` | optional | `{ algorithm: 'HS256' }` | The options object supporting `algorithm` and `keyid`. (See [Available Algorithms](#available-algorithms))
+Argument                 | Type               | Status   | Default     | Description
+------------------------ | ------------------ | -------- | ----------- | -----------
+`payload`                | `object`           | required | -           | The payload object. To use `nbf` (Not Before) and/or `exp` (Expiration Time) add `nbf` and/or `exp` to the payload.
+`secret`                 | `string`           | required | -           | A string which is used to sign the payload.
+`options`                | `string`, `object` | optional | `HS256`     | Either the `algorithm` string or an object.
+`options.algorithm`      | `string`           | optional | `HS256`     | See [Available Algorithms](#available-algorithms)
+`options.keyid`          | `string`           | optional | `undefined` | The `keyid` or `kid` to be set in the header of the resulting JWT.
 
 #### `return`
 Returns token as a `string`.
@@ -100,11 +102,15 @@ Returns token as a `string`.
 
 Verifies the integrity of the token and returns a boolean value.
 
-Argument    | Type     | Status   | Default | Description
------------ | -------- | -------- | ------- | -----------
-`token`     | `string` | required | -       | The token string generated by `jwt.sign()`.
-`secret`    | `string` | required | -       | The string which was used to sign the payload.
-`options`   | `object` | optional | `{ algorithm: 'HS256', skipValidation: false, throwError: false }` | The options object supporting `algorithm`, `skipValidation` and `throwError`. (See [Available Algorithms](#available-algorithms))
+Argument                 | Type               | Status   | Default | Description
+------------------------ | ------------------ | -------- | ------- | -----------
+`token`                  | `string`           | required | -       | The token string generated by `jwt.sign()`.
+`secret`                 | `string`           | required | -       | The string which was used to sign the payload.
+`options`                | `string`, `object` | optional | `HS256` | Either the `algorithm` string or an object.
+`options.algorithm`      | `string`           | optional | `HS256` | See [Available Algorithms](#available-algorithms)
+`options.clockTolerance` | `number`           | optional | `0`     | Clock tolerance in seconds, to help with slighly out of sync systems.
+`options.throwError`     | `boolean`          | optional | `false` | By default this we will only throw implementation errors, only set this to `true` if you want verification errors to be thrown as well.
+
 
 #### `throws`
 If `options.throwError` is `true` and the token is invalid, an error will be thrown.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@tsndr/cloudflare-worker-jwt",
-  "version": "2.4.7",
+  "version": "2.5.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@tsndr/cloudflare-worker-jwt",
-      "version": "2.4.7",
+      "version": "2.5.0",
       "license": "MIT",
       "devDependencies": {
         "@cloudflare/workers-types": "^4.20240208.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tsndr/cloudflare-worker-jwt",
-  "version": "2.4.7",
+  "version": "2.5.0",
   "description": "A lightweight JWT implementation with ZERO dependencies for Cloudflare Worker",
   "type": "module",
   "exports": "./index.js",

src/index.ts

@@ -99,6 +99,11 @@ export type JwtSignOptions<T> = {
  * @prop {boolean} [throwError=false] If `true` throw error if checks fail. (default: `false`)
  */
 export type JwtVerifyOptions = {
+    /**
+    * Clock tolerance to help with slightly out of sync systems
+    */
+    clockTolerance?: number
+
     /**
      * If `true` throw error if checks fail. (default: `false`)
      *
@@ -178,11 +183,10 @@ export async function sign<Payload = {}, Header = {}>(payload: JwtPayload<Payloa
  * @throws {Error | string} Throws an error `string` if the token is invalid or an `Error-Object` if there's a validation issue.
  * @returns {Promise<boolean>} Returns `true` if signature, `nbf` (if set) and `exp` (if set) are valid, otherwise returns `false`.
  */
-export async function verify(token: string, secret: string | JsonWebKey | CryptoKey, options: JwtVerifyOptions | JwtAlgorithm = { algorithm: 'HS256', throwError: false }): Promise<boolean> {
+export async function verify(token: string, secret: string | JsonWebKey | CryptoKey, options: JwtVerifyOptions | JwtAlgorithm = 'HS256'): Promise<boolean> {
     if (typeof options === 'string')
-        options = { algorithm: options, throwError: false }
-
-    options = { algorithm: 'HS256', throwError: false, ...options }
+        options = { algorithm: options }
+    options = { algorithm: 'HS256', clockTolerance: 0, throwError: false, ...options }
 
     if (typeof token !== 'string')
         throw new Error('token must be a string')
@@ -215,10 +219,12 @@ export async function verify(token: string, secret: string | JsonWebKey | Crypto
         if (!payload)
             throw new Error('PARSE_ERROR')
 
-        if (payload.nbf && payload.nbf > Math.floor(Date.now() / 1000))
+        const now = Math.floor(Date.now() / 1000)
+
+        if (payload.nbf && Math.abs(payload.nbf - now) > (options.clockTolerance ?? 0))
             throw new Error('NOT_YET_VALID')
 
-        if (payload.exp && payload.exp <= Math.floor(Date.now() / 1000))
+        if (payload.exp &&  Math.abs(payload.exp - now) > (options.clockTolerance ?? 0))
             throw new Error('EXPIRED')
 
         const key = secret instanceof CryptoKey ? secret : await importKey(secret, algorithm, ['verify'])

tests/index.spec.ts

@@ -120,3 +120,29 @@ describe.each(Object.entries(data) as [JwtAlgorithm, Dataset][])('%s', (algorith
         expect(verified).toBeTruthy()
     })
 })
+
+describe('Verify', async () => {
+    const secret = 'super-secret'
+
+    const now = Math.floor(Date.now() / 1000)
+    const off = 30 // 30 seconds
+    const nbf = now + off // Not valid before 30 seconds from now
+    const exp = now - off // Expired 30 seconds ago
+
+    const notYetValidToken = await jwt.sign({ sub: 'me', nbf }, secret)
+    const expiredToken = await jwt.sign({ sub: 'me', exp }, secret)
+
+    test('Not yet valid', () => {
+        expect(jwt.verify(notYetValidToken, secret, { throwError: true })).rejects.toThrowError('NOT_YET_VALID')
+    })
+
+    test('Expired', () => {
+        console.log({ exp, now: Math.floor(Date.now() / 1000) })
+        expect(jwt.verify(expiredToken, secret, { throwError: true })).rejects.toThrowError('EXPIRED')
+    })
+
+    test('Clock offset', () => {
+        expect(jwt.verify(notYetValidToken, secret, { clockTolerance: off, throwError: true })).resolves.toBe(true)
+        expect(jwt.verify(expiredToken, secret, { clockTolerance: off, throwError: true })).resolves.toBe(true)
+    })
+})