solid-oidc/solid-oidc.js at gh-pages · JavaScriptSolidServer/solid-oidc · GitHub

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/**

* solid-oidc.js - Minimal Solid-OIDC client for browsers

* A zero-build, zero-dependency, single-file Solid-OIDC authentication library.

* @license AGPL-3.0-or-later

* @author Melvin Carvalho

* @see https://github.com/JavaScriptSolidServer/solid-oidc

* Based on solid-oidc-client-browser by uvdsl (Christoph Braun)

* @see https://github.com/uvdsl/solid-oidc-client-browser

* Implements:

* - RFC 6749 - OAuth 2.0

* - RFC 7636 - PKCE

* - RFC 7638 - JWK Thumbprint

* - RFC 9207 - OAuth 2.0 Authorization Server Issuer Identification

* - RFC 9449 - DPoP (Demonstration of Proof-of-Possession)

* - Solid-OIDC Specification

// ============================================================================

// Base64url Helpers

// ============================================================================

function base64urlEncode(data) {

if (data instanceof ArrayBuffer) data = new Uint8Array(data)

return btoa(String.fromCharCode(...data))

.replace(/\+/g, '-')

.replace(/\//g, '_')

.replace(/=+$/, '')

}

function base64urlDecode(str) {

str = str.replace(/-/g, '+').replace(/_/g, '/')

while (str.length % 4) str += '='

return Uint8Array.from(atob(str), c => c.charCodeAt(0))

}

// ============================================================================

// URL Helpers

// ============================================================================

// Normalize URLs by trimming a single trailing slash, so iss/issuer

// comparisons survive trailing-slash variance between OIDC discovery doc,

// redirect `iss` parameter, and token `iss` claim. RFC 9207 §2.3 requires

// comparison after normalization.

const trimSlash = (s) => (typeof s === 'string' && s.endsWith('/')) ? s.slice(0, -1) : s

// ============================================================================

// Web Crypto JWT Helpers (replaces jose dependency)

// ============================================================================

function decodeJwt(token) {

const parts = token.split('.')

if (parts.length !== 3) throw new Error('Invalid JWT')

return JSON.parse(new TextDecoder().decode(base64urlDecode(parts[1])))

}

async function signJWT(payload, privateKey, protectedHeader) {

const header = base64urlEncode(new TextEncoder().encode(JSON.stringify(protectedHeader)))

const body = base64urlEncode(new TextEncoder().encode(JSON.stringify(payload)))

const signingInput = new TextEncoder().encode(`${header}.${body}`)

const signature = await crypto.subtle.sign(

{ name: 'ECDSA', hash: { name: 'SHA-256' } },

privateKey,

signingInput

)

return `${header}.${body}.${base64urlEncode(signature)}`

}

function getImportAlgorithm(alg) {

const algorithms = {

ES256: { name: 'ECDSA', namedCurve: 'P-256' },

ES384: { name: 'ECDSA', namedCurve: 'P-384' },

RS256: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-256' } },

RS384: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-384' } },

RS512: { name: 'RSASSA-PKCS1-v1_5', hash: { name: 'SHA-512' } },

PS256: { name: 'RSA-PSS', hash: { name: 'SHA-256' } },

PS384: { name: 'RSA-PSS', hash: { name: 'SHA-384' } },

PS512: { name: 'RSA-PSS', hash: { name: 'SHA-512' } }

}

if (!algorithms[alg]) throw new Error(`Unsupported algorithm: ${alg}`)

return algorithms[alg]

}

function getVerifyAlgorithm(alg) {

if (alg.startsWith('ES')) return { name: 'ECDSA', hash: { name: `SHA-${alg.slice(2)}` } }

if (alg.startsWith('RS')) return { name: 'RSASSA-PKCS1-v1_5' }

if (alg.startsWith('PS')) return { name: 'RSA-PSS', saltLength: parseInt(alg.slice(2)) / 8 }

throw new Error(`Unsupported algorithm: ${alg}`)

}

async function verifyJWT(token, jwksUri, options = {}) {

const parts = token.split('.')

if (parts.length !== 3) throw new Error('Invalid JWT')

const header = JSON.parse(new TextDecoder().decode(base64urlDecode(parts[0])))

const payload = JSON.parse(new TextDecoder().decode(base64urlDecode(parts[1])))

if (options.issuer && trimSlash(payload.iss) !== trimSlash(options.issuer)) {

throw new Error(`Issuer mismatch: ${payload.iss} !== ${options.issuer}`)

}

if (options.audience) {

const aud = Array.isArray(payload.aud) ? payload.aud : [payload.aud]

if (!aud.includes(options.audience)) throw new Error('Audience mismatch')

}

// Time-based claims (exp, nbf) with 60s clock skew tolerance

const now = Math.floor(Date.now() / 1000)

const skew = 60

if (typeof payload.exp === 'number' && now - skew > payload.exp) {

throw new Error('Token expired')

}

if (typeof payload.nbf === 'number' && now + skew < payload.nbf) {

throw new Error('Token not yet valid')

}

// Fetch JWKS and find matching key

const response = await fetch(jwksUri)

if (!response.ok) throw new Error(`JWKS fetch failed: ${response.status}`)

const jwks = await response.json()

const jwk = header.kid

? jwks.keys.find(k => k.kid === header.kid)

: jwks.keys.find(k => k.alg === header.alg || (!k.alg && (!k.use || k.use === 'sig')))

if (!jwk) throw new Error('No matching key found in JWKS')

const publicKey = await crypto.subtle.importKey(

'jwk', jwk, getImportAlgorithm(header.alg), false, ['verify']

)

const valid = await crypto.subtle.verify(

getVerifyAlgorithm(header.alg),

publicKey,

base64urlDecode(parts[2]),

new TextEncoder().encode(`${parts[0]}.${parts[1]}`)

)

if (!valid) throw new Error('Invalid signature')

return { payload, protectedHeader: header }

}

/** JWK Thumbprint per RFC 7638 */

async function calculateJwkThumbprint(jwk) {

// Required members in lexicographic order per key type

let thumbprintInput

if (jwk.kty === 'EC') {

thumbprintInput = JSON.stringify({ crv: jwk.crv, kty: jwk.kty, x: jwk.x, y: jwk.y })

} else if (jwk.kty === 'RSA') {

thumbprintInput = JSON.stringify({ e: jwk.e, kty: jwk.kty, n: jwk.n })

} else {

throw new Error(`Unsupported key type: ${jwk.kty}`)

}

const digest = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(thumbprintInput))

return base64urlEncode(digest)

}

// ============================================================================

// Session Events

// ============================================================================

export const SessionEvents = {

STATE_CHANGE: 'sessionStateChange',

EXPIRATION_WARNING: 'sessionExpirationWarning',

EXPIRATION: 'sessionExpiration'

}

// ============================================================================

// Session Database Interface (IndexedDB Implementation)

// ============================================================================

export class SessionDatabase {

constructor(dbName = 'solid-oidc', storeName = 'session', dbVersion = 1) {

this.dbName = dbName

this.storeName = storeName

this.dbVersion = dbVersion

this.db = null

}

async init() {

return new Promise((resolve, reject) => {

const request = indexedDB.open(this.dbName, this.dbVersion)

request.onerror = () => reject(new Error(`Database error: ${request.error}`))

request.onsuccess = () => {

this.db = request.result

resolve(this)

}

request.onupgradeneeded = (event) => {

const db = event.target.result

if (!db.objectStoreNames.contains(this.storeName)) {

db.createObjectStore(this.storeName)

}

})

}

async setItem(id, value) {

if (!this.db) await this.init()

return new Promise((resolve, reject) => {

const tx = this.db.transaction(this.storeName, 'readwrite')

tx.oncomplete = () => resolve()

tx.onerror = () => reject(new Error(`Transaction error: ${tx.error}`))

tx.objectStore(this.storeName).put(value, id)

})

}

async getItem(id) {

if (!this.db) await this.init()

return new Promise((resolve, reject) => {

const tx = this.db.transaction(this.storeName, 'readonly')

tx.onerror = () => reject(new Error(`Transaction error: ${tx.error}`))

const request = tx.objectStore(this.storeName).get(id)

request.onsuccess = () => resolve(request.result || null)

})

}

async deleteItem(id) {

if (!this.db) await this.init()

return new Promise((resolve, reject) => {

const tx = this.db.transaction(this.storeName, 'readwrite')

tx.oncomplete = () => resolve()

tx.onerror = () => reject(new Error(`Transaction error: ${tx.error}`))

tx.objectStore(this.storeName).delete(id)

})

}

async clear() {

if (!this.db) await this.init()

return new Promise((resolve, reject) => {

const tx = this.db.transaction(this.storeName, 'readwrite')

tx.oncomplete = () => resolve()

tx.onerror = () => reject(new Error(`Transaction error: ${tx.error}`))

tx.objectStore(this.storeName).clear()

})

}

close() {

if (this.db) {

this.db.close()

this.db = null

}

// ============================================================================

// PKCE Helper (RFC 7636)

// ============================================================================

async function generatePKCE() {

const verifier = crypto.randomUUID() + '-' + crypto.randomUUID()

const digest = new Uint8Array(

await crypto.subtle.digest('SHA-256', new TextEncoder().encode(verifier))

)

const challenge = btoa(String.fromCharCode(...digest))

.replace(/\+/g, '-')

.replace(/\//g, '_')

.replace(/=+$/, '')

return { verifier, challenge }

}

// ============================================================================

// DPoP Helper (RFC 9449)

// ============================================================================

async function createDPoPToken(keyPair, htu, htm, ath = null) {

const publicJwk = await crypto.subtle.exportKey('jwk', keyPair.publicKey)

// Strip non-required fields for cleaner header

const jwk = { kty: publicJwk.kty, crv: publicJwk.crv, x: publicJwk.x, y: publicJwk.y }

const payload = {

htu,

htm,

iat: Math.floor(Date.now() / 1000),

jti: crypto.randomUUID()

}

if (ath) payload.ath = ath

return signJWT(payload, keyPair.privateKey, { alg: 'ES256', typ: 'dpop+jwt', jwk })

}

async function computeAth(accessToken) {

const data = new TextEncoder().encode(accessToken)

const hashBuffer = await crypto.subtle.digest('SHA-256', data)

const hashArray = Array.from(new Uint8Array(hashBuffer))

return btoa(String.fromCharCode(...hashArray))

.replace(/\+/g, '-')

.replace(/\//g, '_')

.replace(/=+$/, '')

}

// ============================================================================

// OIDC Discovery

// ============================================================================

async function discoverOIDC(idp) {

const origin = new URL(idp).origin

const response = await fetch(`${origin}/.well-known/openid-configuration`)

if (!response.ok) throw new Error(`OIDC discovery failed: ${response.status}`)

return response.json()

}

// ============================================================================

// Dynamic Client Registration

// ============================================================================

async function registerClient(registrationEndpoint, redirectUris) {

const response = await fetch(registrationEndpoint, {

method: 'POST',

headers: { 'Content-Type': 'application/json' },

body: JSON.stringify({

application_type: 'web',

redirect_uris: redirectUris,

token_endpoint_auth_method: 'none',

grant_types: ['authorization_code', 'refresh_token'],

response_types: ['code'],

scope: 'openid offline_access webid'

})

if (!response.ok) throw new Error(`Client registration failed: ${response.status}`)

return response.json()

}

// ============================================================================

// Token Request

// ============================================================================

async function requestTokens(tokenEndpoint, params, keyPair) {

const dpop = await createDPoPToken(keyPair, tokenEndpoint, 'POST')

const response = await fetch(tokenEndpoint, {

method: 'POST',

headers: {

'Content-Type': 'application/x-www-form-urlencoded',

'DPoP': dpop

body: new URLSearchParams(params)

})

if (!response.ok) throw new Error(`Token request failed: ${response.status}`)

return response.json()

}

// ============================================================================

// Token Validation

// ============================================================================

async function validateAccessToken(accessToken, jwksUri, issuer, clientId, keyPair) {

const { payload } = await verifyJWT(accessToken, jwksUri, {

issuer,

audience: 'solid'

})

// Verify DPoP binding

const publicJwk = await crypto.subtle.exportKey('jwk', keyPair.publicKey)

const thumbprint = await calculateJwkThumbprint(publicJwk)

if (payload.cnf?.jkt !== thumbprint) {

throw new Error('DPoP thumbprint mismatch')

}

// Verify client_id

if (payload.client_id !== clientId) {

throw new Error('client_id mismatch')

}

return payload

}

// ============================================================================

// Refresh Token Grant

// ============================================================================

async function refreshTokens(database) {

await database.init()

const [refreshToken, tokenEndpoint, clientId, keyPair] = await Promise.all([

database.getItem('refresh_token'),

database.getItem('token_endpoint'),

database.getItem('client_id'),

database.getItem('dpop_keypair')

])

if (!refreshToken || !tokenEndpoint || !clientId || !keyPair) {

throw new Error('Missing refresh data')

}

const tokens = await requestTokens(tokenEndpoint, {

grant_type: 'refresh_token',

refresh_token: refreshToken,

client_id: clientId

}, keyPair)

// Persist new refresh token if provided

if (tokens.refresh_token) {

await database.setItem('refresh_token', tokens.refresh_token)

}

database.close()

return { ...tokens, dpop_key_pair: keyPair }

}

// ============================================================================

// Main Session Class

// ============================================================================

export class Session extends EventTarget {

constructor(options = {}) {

super()

this.clientId = options.clientId || null

this.database = options.database || new SessionDatabase()

this.onStateChange = options.onStateChange || null

this.onExpirationWarning = options.onExpirationWarning || null

this.onExpiration = options.onExpiration || null

// Internal state

this._isActive = false

this._webId = null

this._exp = null

this._ath = null

this._tokens = null

this._idpDetails = null

this._refreshPromise = null

// Bind so authFetch survives being passed by reference (drop-in fetch):

// consumers hand it to rdflib / solid-logic / rdf-dereference as a bare

// `fetch`, which would otherwise lose `this`.

this.authFetch = this.authFetch.bind(this)

// Set up event listeners

if (this.onStateChange) {

this.addEventListener(SessionEvents.STATE_CHANGE, this.onStateChange)

}

if (this.onExpirationWarning) {

this.addEventListener(SessionEvents.EXPIRATION_WARNING, this.onExpirationWarning)

}

if (this.onExpiration) {

this.addEventListener(SessionEvents.EXPIRATION, this.onExpiration)

}

// ==========================================================================

// Public API

// ==========================================================================

get isActive() { return this._isActive }

get webId() { return this._webId }

isExpired() {

if (!this._exp) return true

return Math.floor(Date.now() / 1000) >= this._exp

}

getExpiresIn() {

if (!this._exp) return -1

return this._exp - Math.floor(Date.now() / 1000)

}

/**

* Redirect user to identity provider for login

async login(idp, redirectUri) {

// Sanitize redirect URI (RFC 6749 Section 3.1.2)

const redirectUrl = new URL(redirectUri)

const sanitizedRedirect = redirectUrl.origin + redirectUrl.pathname + redirectUrl.search

// OIDC Discovery

const config = await discoverOIDC(idp)

// RFC 9207: Verify issuer

const issuer = config.issuer

if (trimSlash(idp) !== trimSlash(issuer)) {

throw new Error(`Issuer mismatch: ${issuer} !== ${idp}`)

}

// Store IDP details

sessionStorage.setItem('solid_oidc_idp', issuer)

sessionStorage.setItem('solid_oidc_token_endpoint', config.token_endpoint)

sessionStorage.setItem('solid_oidc_jwks_uri', config.jwks_uri)

// Get or register client_id

let clientId = this.clientId

if (!clientId) {

const registration = await registerClient(config.registration_endpoint, [sanitizedRedirect])

clientId = registration.client_id

sessionStorage.setItem('solid_oidc_client_id', clientId)

}

// PKCE (RFC 7636)

const pkce = await generatePKCE()

sessionStorage.setItem('solid_oidc_pkce_verifier', pkce.verifier)

// CSRF token

const csrfToken = crypto.randomUUID()

sessionStorage.setItem('solid_oidc_csrf', csrfToken)

// Build authorization URL

const authUrl = new URL(config.authorization_endpoint)

authUrl.searchParams.set('response_type', 'code')

authUrl.searchParams.set('redirect_uri', sanitizedRedirect)

authUrl.searchParams.set('scope', 'openid offline_access webid')

authUrl.searchParams.set('client_id', clientId)

authUrl.searchParams.set('code_challenge_method', 'S256')

authUrl.searchParams.set('code_challenge', pkce.challenge)

authUrl.searchParams.set('state', csrfToken)

authUrl.searchParams.set('prompt', 'consent')

// Redirect to IDP

window.location.href = authUrl.toString()

}

/**

* Handle redirect from identity provider after login

async handleRedirectFromLogin() {

const url = new URL(window.location.href)

const code = url.searchParams.get('code')

// No code = not a redirect, nothing to do

if (!code) return

// RFC 9207: Verify issuer

const idp = sessionStorage.getItem('solid_oidc_idp')

const iss = url.searchParams.get('iss')

if (!idp || trimSlash(iss) !== trimSlash(idp)) {

throw new Error(`Issuer mismatch: ${iss} !== ${idp}`)

}

// RFC 6749: Verify CSRF token

const csrf = sessionStorage.getItem('solid_oidc_csrf')

if (url.searchParams.get('state') !== csrf) {

throw new Error('CSRF token mismatch')

}

// Clean URL

url.searchParams.delete('code')

url.searchParams.delete('iss')

url.searchParams.delete('state')

window.history.replaceState({}, document.title, url.toString())

// Get stored values

const pkceVerifier = sessionStorage.getItem('solid_oidc_pkce_verifier')

const tokenEndpoint = sessionStorage.getItem('solid_oidc_token_endpoint')

const jwksUri = sessionStorage.getItem('solid_oidc_jwks_uri')

const clientId = this.clientId || sessionStorage.getItem('solid_oidc_client_id')

if (!pkceVerifier || !tokenEndpoint || !clientId) {

throw new Error('Missing session data')

}

// Generate DPoP key pair (ES256 / P-256)

const keyPair = await crypto.subtle.generateKey(

{ name: 'ECDSA', namedCurve: 'P-256' },

true,

['sign', 'verify']

)

// Exchange code for tokens

const tokens = await requestTokens(tokenEndpoint, {

grant_type: 'authorization_code',

code,

code_verifier: pkceVerifier,

redirect_uri: url.origin + url.pathname,

client_id: clientId

}, keyPair)

// Validate access token

await validateAccessToken(tokens.access_token, jwksUri, idp, clientId, keyPair)

// Store IDP details

this._idpDetails = { idp, jwksUri, tokenEndpoint }

// Persist for refresh

await this.database.init()

await Promise.all([

this.database.setItem('idp', idp),

this.database.setItem('jwks_uri', jwksUri),

this.database.setItem('token_endpoint', tokenEndpoint),

this.database.setItem('client_id', clientId),

this.database.setItem('dpop_keypair', keyPair),

this.database.setItem('refresh_token', tokens.refresh_token)

])

this.database.close()

// Clean session storage

sessionStorage.removeItem('solid_oidc_idp')

sessionStorage.removeItem('solid_oidc_token_endpoint')

sessionStorage.removeItem('solid_oidc_jwks_uri')

sessionStorage.removeItem('solid_oidc_client_id')

sessionStorage.removeItem('solid_oidc_pkce_verifier')

sessionStorage.removeItem('solid_oidc_csrf')

// Update session state

await this._setTokens({ ...tokens, dpop_key_pair: keyPair })

this._dispatchStateChange()

}

/**

* Restore session using stored refresh token

async restore() {

if (this._refreshPromise) return this._refreshPromise

this._refreshPromise = (async () => {

try {

const tokens = await refreshTokens(this.database)

await this._setTokens(tokens)

this._dispatchStateChange()

} catch (error) {

if (this._isActive) {

if (!this.isExpired()) {

this._dispatchExpirationWarning()

} else {

this._dispatchExpiration()

}

throw error

} finally {

this._refreshPromise = null

}

})()

return this._refreshPromise

}

/**

* Log out and clear all session data

async logout() {

this._isActive = false

this._webId = null

this._exp = null

this._ath = null

this._tokens = null

this._idpDetails = null

await this.database.init()

await this.database.clear()

this.database.close()

this._dispatchStateChange()

}

/**

* Make authenticated fetch request with DPoP

async authFetch(input, init = {}) {

// No session = regular fetch

if (!this._isActive) {

return fetch(input, init)

}

// Refresh if expired

if (this.isExpired()) {

await this.restore()

}

// Parse request

let url, method, headers

if (input instanceof Request) {

url = new URL(input.url)

method = init.method || input.method || 'GET'

headers = new Headers(input.headers)

} else {

url = new URL(input.toString())

method = init.method || 'GET'

headers = init.headers ? new Headers(init.headers) : new Headers()

}

// Create DPoP proof

const dpop = await createDPoPToken(

this._tokens.dpop_key_pair,

`${url.origin}${url.pathname}`,

method.toUpperCase(),

this._ath

)

// Set auth headers

headers.set('DPoP', dpop)

headers.set('Authorization', `DPoP ${this._tokens.access_token}`)

// Make request

if (input instanceof Request) {

return fetch(new Request(input, { ...init, headers }))

}

return fetch(url, { ...init, headers })

}

// ==========================================================================

// Internal Methods

// ==========================================================================

async _setTokens(tokens) {

this._tokens = tokens

const decoded = decodeJwt(tokens.access_token)

if (!decoded.webid) throw new Error('Missing webid claim')

if (!decoded.exp) throw new Error('Missing exp claim')

this._ath = await computeAth(tokens.access_token)

this._webId = decoded.webid

this._exp = decoded.exp

this._isActive = true

}

_dispatchStateChange() {

this.dispatchEvent(new CustomEvent(SessionEvents.STATE_CHANGE, {

detail: { isActive: this._isActive, webId: this._webId }

}))

}

_dispatchExpirationWarning() {

this.dispatchEvent(new CustomEvent(SessionEvents.EXPIRATION_WARNING, {

detail: { expires_in: this.getExpiresIn() }

}))

}

_dispatchExpiration() {

this.dispatchEvent(new CustomEvent(SessionEvents.EXPIRATION))

}

// ============================================================================

// Default Export

// ============================================================================

export default Session

solid-oidc/solid-oidc.js at gh-pages · JavaScriptSolidServer/solid-oidc · GitHub

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