Function postTokenCount

web/src/app/api/v1/token-count/_post.ts:37–123

(params: {
  req: NextRequest
  getUserInfoFromApiKey: GetUserInfoFromApiKeyFn
  logger: Logger
  loggerWithContext: LoggerWithContextFn
  trackEvent: TrackEventFn
  fetch: typeof globalThis.fetch
})

const DEFAULT_ANTHROPIC_MODEL = 'claude-opus-4-6'

export async function postTokenCount(params: {
  req: NextRequest
  getUserInfoFromApiKey: GetUserInfoFromApiKeyFn
  logger: Logger
  loggerWithContext: LoggerWithContextFn
  trackEvent: TrackEventFn
  fetch: typeof globalThis.fetch
}) {
  const {
    req,
    getUserInfoFromApiKey,
    logger: baseLogger,
    loggerWithContext,
    trackEvent,
    fetch,
  } = params

  // Authenticate user
  const userResult = await requireUserFromApiKey({
    req,
    getUserInfoFromApiKey,
    logger: baseLogger,
    loggerWithContext,
    trackEvent,
    authErrorEvent: AnalyticsEvent.TOKEN_COUNT_AUTH_ERROR,
  })

  if (!userResult.ok) {
    return userResult.response
  }

  const { userId, logger } = userResult.data

  // Parse request body
  const bodyResult = await parseJsonBody({
    req,
    schema: tokenCountRequestSchema,
    logger,
    trackEvent,
    validationErrorEvent: AnalyticsEvent.TOKEN_COUNT_VALIDATION_ERROR,
  })

  if (!bodyResult.ok) {
    return bodyResult.response
  }

  const { messages, system, model, tools } = bodyResult.data

  try {
    const useOpenAI = model != null && false // isOpenAIProviderModel(model)
    const inputTokens = useOpenAI
      ? await countTokensViaOpenAI({ messages, system, model, fetch, logger })
      : await countTokensViaAnthropic({
        messages,
        system,
        model,
        tools,
        fetch,