Method errorForResponse

src/AppStoreServerAPI.ts:249–274

* Builds an error from a non-success API response. * * Apple documents error responses as JSON containing `errorCode` and `errorMessage`, but an * actual infrastructure failure can still return a non-JSON body (e.g. an HTML 5xx page, or an * empty body). The body is therefore parsed defe

(result: Response, retryAfter?: number)

   * the raw body rather than throwing an opaque JSON parse error.
   */
  private async errorForResponse(result: Response, retryAfter?: number): Promise<Error> {
    const text = await result.text()

    let parsed: unknown
    try {
      parsed = JSON.parse(text)
    } catch {
      parsed = undefined
    }

    if (
      typeof parsed === "object" &&
      parsed !== null &&
      "errorCode" in parsed &&
      typeof parsed.errorCode === "number" &&
      "errorMessage" in parsed &&
      typeof parsed.errorMessage === "string"
    ) {
      return new AppStoreError(parsed.errorCode, parsed.errorMessage, retryAfter)
    }

    const body = text.trim()
    const snippet = body.length > 500 ? `${body.slice(0, 500)}…` : body
    const detail = snippet.length > 0 ? `: ${snippet}` : ""
    return new Error(`The App Store Server API returned an unexpected response (HTTP ${result.status})${detail}`)
  }

  /**
   * Returns an existing authentication token (if its still valid) or generates a new one.