Refactor lab 1 for Netron and local confidence views

src/lib/courseware-runtime.ts

@@ -0,0 +1,94 @@
+export const COURSEWARE_RUNTIME_CONFIG_PATH = "/courseware-runtime.json";
+export const LAB1_DEFAULT_NETRON_URL = "http://127.0.0.1:8338";
+export const LAB3_DEFAULT_TERMINAL_PATH = "/wetty";
+
+export type CoursewareRuntimeConfig = {
+  lab1NetronUrl?: string;
+  lab3TerminalUrl?: string;
+};
+
+export type ResolvedCoursewareRuntimeConfig = {
+  lab1NetronUrl: string;
+  lab3TerminalUrl: string;
+};
+
+const loopbackHosts = new Set(["127.0.0.1", "localhost", "::1"]);
+
+function rewriteLoopbackHost(urlValue: string, currentHostname?: string) {
+  try {
+    const url = new URL(urlValue);
+    if (!currentHostname || !loopbackHosts.has(url.hostname)) {
+      return url.toString();
+    }
+
+    url.hostname = currentHostname;
+    return url.toString();
+  } catch {
+    return urlValue;
+  }
+}
+
+function getCurrentHostname() {
+  if (typeof window === "undefined") {
+    return undefined;
+  }
+
+  const hostname = window.location.hostname?.trim();
+  return hostname || undefined;
+}
+
+export function getLab1NetronUrl(
+  envValue?: string,
+  currentHostname = getCurrentHostname(),
+) {
+  const trimmedValue = envValue?.trim();
+
+  if (!trimmedValue) {
+    return rewriteLoopbackHost(LAB1_DEFAULT_NETRON_URL, currentHostname);
+  }
+
+  return rewriteLoopbackHost(trimmedValue, currentHostname);
+}
+
+export function getLab3TerminalPath(
+  envValue?: string,
+  currentHostname = getCurrentHostname(),
+) {
+  const trimmedValue = envValue?.trim();
+
+  if (!trimmedValue) {
+    return LAB3_DEFAULT_TERMINAL_PATH;
+  }
+
+  if (/^https?:\/\//i.test(trimmedValue)) {
+    return rewriteLoopbackHost(trimmedValue, currentHostname);
+  }
+
+  return trimmedValue.startsWith("/") ? trimmedValue : `/${trimmedValue}`;
+}
+
+export function normalizeCoursewareRuntimeConfig(
+  config?: CoursewareRuntimeConfig,
+  currentHostname = getCurrentHostname(),
+): ResolvedCoursewareRuntimeConfig {
+  return {
+    lab1NetronUrl: getLab1NetronUrl(config?.lab1NetronUrl, currentHostname),
+    lab3TerminalUrl: getLab3TerminalPath(
+      config?.lab3TerminalUrl,
+      currentHostname,
+    ),
+  };
+}
+
+export async function fetchCoursewareRuntimeConfig() {
+  const response = await fetch(COURSEWARE_RUNTIME_CONFIG_PATH, {
+    cache: "no-store",
+  });
+
+  if (!response.ok) {
+    throw new Error(`Runtime config request failed: ${response.status}`);
+  }
+
+  const config = (await response.json()) as CoursewareRuntimeConfig;
+  return normalizeCoursewareRuntimeConfig(config);
+}