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feat: auto-persist rotated refresh tokens #8

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feat: auto-persist rotated refresh tokens #8

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40 changes: 34 additions & 6 deletions src/oauth.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
import { request as httpsRequest } from 'https'
import { readFileSync, writeFileSync } from 'fs'
import { resolve } from 'path'
import { log } from './logger.js'

const TOKEN_URL = 'https://platform.claude.com/v1/oauth/token'
Expand All @@ -18,19 +20,40 @@ type OAuthTokens = {
}

let cachedTokens: OAuthTokens | null = null
let configPath: string = resolve(process.cwd(), 'config.yaml')

function persistRefreshToken(newToken: string) {
try {
const raw = readFileSync(configPath, 'utf-8')
const updated = raw.replace(
/refresh_token:\s*["'].*?["']/,
`refresh_token: "${newToken}"`
)
writeFileSync(configPath, updated, 'utf-8')
log('info', 'Persisted new refresh_token to config.yaml')
} catch (err) {
log('warn', `Failed to persist refresh_token: ${err}`)
}
}

/**
* Initialize OAuth with a refresh token.
* The gateway holds the refresh token and manages access token lifecycle.
* Client machines never need to contact platform.claude.com.
*/
export async function initOAuth(refreshToken: string): Promise<void> {
export async function initOAuth(refreshToken: string, cfgPath?: string): Promise<void> {
if (cfgPath) configPath = cfgPath
log('info', 'Refreshing OAuth token...')
cachedTokens = await refreshOAuthToken(refreshToken)
log('info', `OAuth token acquired, expires at ${new Date(cachedTokens.expiresAt).toISOString()}`)

// Persist rotated refresh token
if (cachedTokens.refreshToken !== refreshToken) {
persistRefreshToken(cachedTokens.refreshToken)
}

// Auto-refresh 5 minutes before expiry
scheduleRefresh(refreshToken)
scheduleRefresh(cachedTokens.refreshToken)
}

function scheduleRefresh(refreshToken: string) {
Expand All @@ -42,11 +65,16 @@ function scheduleRefresh(refreshToken: string) {
setTimeout(async () => {
try {
log('info', 'Auto-refreshing OAuth token...')
cachedTokens = await refreshOAuthToken(
cachedTokens?.refreshToken || refreshToken,
)
const prevToken = cachedTokens?.refreshToken || refreshToken
cachedTokens = await refreshOAuthToken(prevToken)
log('info', `OAuth token refreshed, expires at ${new Date(cachedTokens.expiresAt).toISOString()}`)
scheduleRefresh(cachedTokens.refreshToken || refreshToken)

// Persist rotated refresh token
if (cachedTokens.refreshToken !== prevToken) {
persistRefreshToken(cachedTokens.refreshToken)
}

scheduleRefresh(cachedTokens.refreshToken)
} catch (err) {
log('error', `OAuth refresh failed: ${err}. Retrying in 30s...`)
setTimeout(() => scheduleRefresh(refreshToken), 30_000)
Expand Down