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import type { Hooks, PluginInput } from "@opencode-ai/plugin"
import { Log } from "../util/log"
import { Installation } from "../installation"
import { Auth, OAUTH_DUMMY_KEY } from "../auth"
import os from "os"
import { ProviderTransform } from "@/provider/transform"
const log = Log.create({ service: "plugin.codex" })
const CLIENT_ID = "app_EMoamEEZ73f0CkXaXp7hrann"
const ISSUER = "https://auth.openai.com"
const CODEX_API_ENDPOINT = "https://chatgpt.com/backend-api/codex/responses"
const OAUTH_PORT = 1455
const OAUTH_POLLING_SAFETY_MARGIN_MS = 3000
interface PkceCodes {
verifier: string
challenge: string
}
async function generatePKCE(): Promise<PkceCodes> {
const verifier = generateRandomString(43)
const encoder = new TextEncoder()
const data = encoder.encode(verifier)
const hash = await crypto.subtle.digest("SHA-256", data)
const challenge = base64UrlEncode(hash)
return { verifier, challenge }
}
function generateRandomString(length: number): string {
const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~"
const bytes = crypto.getRandomValues(new Uint8Array(length))
return Array.from(bytes)
.map((b) => chars[b % chars.length])
.join("")
}
function base64UrlEncode(buffer: ArrayBuffer): string {
const bytes = new Uint8Array(buffer)
const binary = String.fromCharCode(...bytes)
return btoa(binary).replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/, "")
}
function generateState(): string {
return base64UrlEncode(crypto.getRandomValues(new Uint8Array(32)).buffer)
}
export interface IdTokenClaims {
chatgpt_account_id?: string
organizations?: Array<{ id: string }>
email?: string
"https://api.openai.com/auth"?: {
chatgpt_account_id?: string
}
}
export function parseJwtClaims(token: string): IdTokenClaims | undefined {
const parts = token.split(".")
if (parts.length !== 3) return undefined
try {
return JSON.parse(Buffer.from(parts[1], "base64url").toString())
} catch {
return undefined
}
}
export function extractAccountIdFromClaims(claims: IdTokenClaims): string | undefined {
return (
claims.chatgpt_account_id ||
claims["https://api.openai.com/auth"]?.chatgpt_account_id ||
claims.organizations?.[0]?.id
)
}
export function extractAccountId(tokens: TokenResponse): string | undefined {
if (tokens.id_token) {
const claims = parseJwtClaims(tokens.id_token)
const accountId = claims && extractAccountIdFromClaims(claims)
if (accountId) return accountId
}
if (tokens.access_token) {
const claims = parseJwtClaims(tokens.access_token)
return claims ? extractAccountIdFromClaims(claims) : undefined
}
return undefined
}
function buildAuthorizeUrl(redirectUri: string, pkce: PkceCodes, state: string): string {
const params = new URLSearchParams({
response_type: "code",
client_id: CLIENT_ID,
redirect_uri: redirectUri,
scope: "openid profile email offline_access",
code_challenge: pkce.challenge,
code_challenge_method: "S256",
id_token_add_organizations: "true",
codex_cli_simplified_flow: "true",
state,
originator: "opencode",
})
return `${ISSUER}/oauth/authorize?${params.toString()}`
}
interface TokenResponse {
id_token: string
access_token: string
refresh_token: string
expires_in?: number
}
async function exchangeCodeForTokens(code: string, redirectUri: string, pkce: PkceCodes): Promise<TokenResponse> {
const response = await fetch(`${ISSUER}/oauth/token`, {
method: "POST",
headers: { "Content-Type": "application/x-www-form-urlencoded" },
body: new URLSearchParams({
grant_type: "authorization_code",
code,
redirect_uri: redirectUri,
client_id: CLIENT_ID,
code_verifier: pkce.verifier,
}).toString(),
})
if (!response.ok) {
throw new Error(`Token exchange failed: ${response.status}`)
}
return response.json()
}
async function refreshAccessToken(refreshToken: string): Promise<TokenResponse> {
const response = await fetch(`${ISSUER}/oauth/token`, {
method: "POST",
headers: { "Content-Type": "application/x-www-form-urlencoded" },
body: new URLSearchParams({
grant_type: "refresh_token",
refresh_token: refreshToken,
client_id: CLIENT_ID,
}).toString(),
})
if (!response.ok) {
throw new Error(`Token refresh failed: ${response.status}`)
}
return response.json()
}
const HTML_SUCCESS = `<!doctype html>
<html>
<head>
<title>OpenCode - Codex Authorization Successful</title>
<style>
body {
font-family:
system-ui,
-apple-system,
sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
background: #131010;
color: #f1ecec;
}
.container {
text-align: center;
padding: 2rem;
}
h1 {
color: #f1ecec;
margin-bottom: 1rem;
}
p {
color: #b7b1b1;
}
</style>
</head>
<body>
<div class="container">
<h1>Authorization Successful</h1>
<p>You can close this window and return to OpenCode.</p>
</div>
<script>
setTimeout(() => window.close(), 2000)
</script>
</body>
</html>`
const HTML_ERROR = (error: string) => `<!doctype html>
<html>
<head>
<title>OpenCode - Codex Authorization Failed</title>
<style>
body {
font-family:
system-ui,
-apple-system,
sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
background: #131010;
color: #f1ecec;
}
.container {
text-align: center;
padding: 2rem;
}
h1 {
color: #fc533a;
margin-bottom: 1rem;
}
p {
color: #b7b1b1;
}
.error {
color: #ff917b;
font-family: monospace;
margin-top: 1rem;
padding: 1rem;
background: #3c140d;
border-radius: 0.5rem;
}
</style>
</head>
<body>
<div class="container">
<h1>Authorization Failed</h1>
<p>An error occurred during authorization.</p>
<div class="error">${error}</div>
</div>
</body>
</html>`
interface PendingOAuth {
pkce: PkceCodes
state: string
resolve: (tokens: TokenResponse) => void
reject: (error: Error) => void
}
let oauthServer: ReturnType<typeof Bun.serve> | undefined
let pendingOAuth: PendingOAuth | undefined
async function startOAuthServer(): Promise<{ port: number; redirectUri: string }> {
if (oauthServer) {
return { port: OAUTH_PORT, redirectUri: `http://localhost:${OAUTH_PORT}/auth/callback` }
}
oauthServer = Bun.serve({
port: OAUTH_PORT,
fetch(req) {
const url = new URL(req.url)
if (url.pathname === "/auth/callback") {
const code = url.searchParams.get("code")
const state = url.searchParams.get("state")
const error = url.searchParams.get("error")
const errorDescription = url.searchParams.get("error_description")
if (error) {
const errorMsg = errorDescription || error
pendingOAuth?.reject(new Error(errorMsg))
pendingOAuth = undefined
return new Response(HTML_ERROR(errorMsg), {
headers: { "Content-Type": "text/html" },
})
}
if (!code) {
const errorMsg = "Missing authorization code"
pendingOAuth?.reject(new Error(errorMsg))
pendingOAuth = undefined
return new Response(HTML_ERROR(errorMsg), {
status: 400,
headers: { "Content-Type": "text/html" },
})
}
if (!pendingOAuth || state !== pendingOAuth.state) {
const errorMsg = "Invalid state - potential CSRF attack"
pendingOAuth?.reject(new Error(errorMsg))
pendingOAuth = undefined
return new Response(HTML_ERROR(errorMsg), {
status: 400,
headers: { "Content-Type": "text/html" },
})
}
const current = pendingOAuth
pendingOAuth = undefined
exchangeCodeForTokens(code, `http://localhost:${OAUTH_PORT}/auth/callback`, current.pkce)
.then((tokens) => current.resolve(tokens))
.catch((err) => current.reject(err))
return new Response(HTML_SUCCESS, {
headers: { "Content-Type": "text/html" },
})
}
if (url.pathname === "/cancel") {
pendingOAuth?.reject(new Error("Login cancelled"))
pendingOAuth = undefined
return new Response("Login cancelled", { status: 200 })
}
return new Response("Not found", { status: 404 })
},
})
log.info("codex oauth server started", { port: OAUTH_PORT })
return { port: OAUTH_PORT, redirectUri: `http://localhost:${OAUTH_PORT}/auth/callback` }
}
function stopOAuthServer() {
if (oauthServer) {
oauthServer.stop()
oauthServer = undefined
log.info("codex oauth server stopped")
}
}
function waitForOAuthCallback(pkce: PkceCodes, state: string): Promise<TokenResponse> {
return new Promise((resolve, reject) => {
const timeout = setTimeout(
() => {
if (pendingOAuth) {
pendingOAuth = undefined
reject(new Error("OAuth callback timeout - authorization took too long"))
}
},
5 * 60 * 1000,
) // 5 minute timeout
pendingOAuth = {
pkce,
state,
resolve: (tokens) => {
clearTimeout(timeout)
resolve(tokens)
},
reject: (error) => {
clearTimeout(timeout)
reject(error)
},
}
})
}
export async function CodexAuthPlugin(input: PluginInput): Promise<Hooks> {
return {
auth: {
provider: "openai",
async loader(getAuth, provider) {
const auth = await getAuth()
if (auth.type !== "oauth") return {}
// Filter models to only allowed Codex models for OAuth
const allowedModels = new Set([
"gpt-5.1-codex-max",
"gpt-5.1-codex-mini",
"gpt-5.2",
"gpt-5.2-codex",
"gpt-5.3-codex",
"gpt-5.1-codex",
])
for (const modelId of Object.keys(provider.models)) {
if (modelId.includes("codex")) continue
if (allowedModels.has(modelId)) continue
delete provider.models[modelId]
}
if (!provider.models["gpt-5.3-codex"]) {
const model = {
id: "gpt-5.3-codex",
providerID: "openai",
api: {
id: "gpt-5.3-codex",
url: "https://chatgpt.com/backend-api/codex",
npm: "@ai-sdk/openai",
},
name: "GPT-5.3 Codex",
capabilities: {
temperature: false,
reasoning: true,
attachment: true,
toolcall: true,
input: { text: true, audio: false, image: true, video: false, pdf: false },
output: { text: true, audio: false, image: false, video: false, pdf: false },
interleaved: false,
},
cost: { input: 0, output: 0, cache: { read: 0, write: 0 } },
limit: { context: 400_000, input: 272_000, output: 128_000 },
status: "active" as const,
options: {},
headers: {},
release_date: "2026-02-05",
variants: {} as Record<string, Record<string, any>>,
family: "gpt-codex",
}
model.variants = ProviderTransform.variants(model)
provider.models["gpt-5.3-codex"] = model
}
// Zero out costs for Codex (included with ChatGPT subscription)
for (const model of Object.values(provider.models)) {
model.cost = {
input: 0,
output: 0,
cache: { read: 0, write: 0 },
}
}
return {
apiKey: OAUTH_DUMMY_KEY,
async fetch(requestInput: RequestInfo | URL, init?: RequestInit) {
// Remove dummy API key authorization header
if (init?.headers) {
if (init.headers instanceof Headers) {
init.headers.delete("authorization")
init.headers.delete("Authorization")
} else if (Array.isArray(init.headers)) {
init.headers = init.headers.filter(([key]) => key.toLowerCase() !== "authorization")
} else {
delete init.headers["authorization"]
delete init.headers["Authorization"]
}
}
const currentAuth = await getAuth()
if (currentAuth.type !== "oauth") return fetch(requestInput, init)
// Cast to include accountId field
const authWithAccount = currentAuth as typeof currentAuth & { accountId?: string }
// Check if token needs refresh
if (!currentAuth.access || currentAuth.expires < Date.now()) {
log.info("refreshing codex access token")
const tokens = await refreshAccessToken(currentAuth.refresh)
const newAccountId = extractAccountId(tokens) || authWithAccount.accountId
await input.client.auth.set({
path: { id: "openai" },
body: {
type: "oauth",
refresh: tokens.refresh_token,
access: tokens.access_token,
expires: Date.now() + (tokens.expires_in ?? 3600) * 1000,
...(newAccountId && { accountId: newAccountId }),
},
})
currentAuth.access = tokens.access_token
authWithAccount.accountId = newAccountId
}
// Build headers
const headers = new Headers()
if (init?.headers) {
if (init.headers instanceof Headers) {
init.headers.forEach((value, key) => headers.set(key, value))
} else if (Array.isArray(init.headers)) {
for (const [key, value] of init.headers) {
if (value !== undefined) headers.set(key, String(value))
}
} else {
for (const [key, value] of Object.entries(init.headers)) {
if (value !== undefined) headers.set(key, String(value))
}
}
}
// Set authorization header with access token
headers.set("authorization", `Bearer ${currentAuth.access}`)
// Set ChatGPT-Account-Id header for organization subscriptions
if (authWithAccount.accountId) {
headers.set("ChatGPT-Account-Id", authWithAccount.accountId)
}
// Rewrite URL to Codex endpoint
const parsed =
requestInput instanceof URL
? requestInput
: new URL(typeof requestInput === "string" ? requestInput : requestInput.url)
const url =
parsed.pathname.includes("/v1/responses") || parsed.pathname.includes("/chat/completions")
? new URL(CODEX_API_ENDPOINT)
: parsed
return fetch(url, {
...init,
headers,
})
},
}
},
methods: [
{
label: "ChatGPT Pro/Plus (browser)",
type: "oauth",
authorize: async () => {
const { redirectUri } = await startOAuthServer()
const pkce = await generatePKCE()
const state = generateState()
const authUrl = buildAuthorizeUrl(redirectUri, pkce, state)
const callbackPromise = waitForOAuthCallback(pkce, state)
return {
url: authUrl,
instructions: "Complete authorization in your browser. This window will close automatically.",
method: "auto" as const,
callback: async () => {
const tokens = await callbackPromise
stopOAuthServer()
const accountId = extractAccountId(tokens)
return {
type: "success" as const,
refresh: tokens.refresh_token,
access: tokens.access_token,
expires: Date.now() + (tokens.expires_in ?? 3600) * 1000,
accountId,
}
},
}
},
},
{
label: "ChatGPT Pro/Plus (headless)",
type: "oauth",
authorize: async () => {
const deviceResponse = await fetch(`${ISSUER}/api/accounts/deviceauth/usercode`, {
method: "POST",
headers: {
"Content-Type": "application/json",
"User-Agent": `opencode/${Installation.VERSION}`,
},
body: JSON.stringify({ client_id: CLIENT_ID }),
})
if (!deviceResponse.ok) throw new Error("Failed to initiate device authorization")
const deviceData = (await deviceResponse.json()) as {
device_auth_id: string
user_code: string
interval: string
}
const interval = Math.max(parseInt(deviceData.interval) || 5, 1) * 1000
return {
url: `${ISSUER}/codex/device`,
instructions: `Enter code: ${deviceData.user_code}`,
method: "auto" as const,
async callback() {
while (true) {
const response = await fetch(`${ISSUER}/api/accounts/deviceauth/token`, {
method: "POST",
headers: {
"Content-Type": "application/json",
"User-Agent": `opencode/${Installation.VERSION}`,
},
body: JSON.stringify({
device_auth_id: deviceData.device_auth_id,
user_code: deviceData.user_code,
}),
})
if (response.ok) {
const data = (await response.json()) as {
authorization_code: string
code_verifier: string
}
const tokenResponse = await fetch(`${ISSUER}/oauth/token`, {
method: "POST",
headers: { "Content-Type": "application/x-www-form-urlencoded" },
body: new URLSearchParams({
grant_type: "authorization_code",
code: data.authorization_code,
redirect_uri: `${ISSUER}/deviceauth/callback`,
client_id: CLIENT_ID,
code_verifier: data.code_verifier,
}).toString(),
})
if (!tokenResponse.ok) {
throw new Error(`Token exchange failed: ${tokenResponse.status}`)
}
const tokens: TokenResponse = await tokenResponse.json()
return {
type: "success" as const,
refresh: tokens.refresh_token,
access: tokens.access_token,
expires: Date.now() + (tokens.expires_in ?? 3600) * 1000,
accountId: extractAccountId(tokens),
}
}
if (response.status !== 403 && response.status !== 404) {
return { type: "failed" as const }
}
await Bun.sleep(interval + OAUTH_POLLING_SAFETY_MARGIN_MS)
}
},
}
},
},
{
label: "Manually enter API Key",
type: "api",
},
],
},
"chat.headers": async (input, output) => {
if (input.model.providerID !== "openai") return
output.headers.originator = "opencode"
output.headers["User-Agent"] = `opencode/${Installation.VERSION} (${os.platform()} ${os.release()}; ${os.arch()})`
output.headers.session_id = input.sessionID
},
}
}