[Init] Initial commit - NetMesh terminal manager

infrastructure/ai/anthropicCompatBaseUrl.ts

@@ -0,0 +1,51 @@
+/**
+ * Anthropic-compatible gateways disagree on Base URL shape:
+ * - Claude Code / official host: bare origin (…/host), paths are /v1/messages, /v1/models
+ * - @ai-sdk/anthropic: base already includes /v1, then appends /messages, /models
+ * - Custom proxies: complete SDK prefix that is not /v1 (e.g. …/anthropic → /anthropic/messages)
+ *
+ * Netcatty accepts Claude Code bare hosts and AI SDK /v1 bases at chat / probe
+ * boundaries. Custom non-/v1 path prefixes are left unchanged so previously
+ * working proxy bases keep working.
+ */
+
+/** Strip trailing slashes; empty input stays empty. */
+export function stripTrailingSlashes(url: string): string {
+  return url.trim().replace(/\/+$/, "");
+}
+
+/** True when the URL path already ends with /v1 (AI SDK style). */
+export function anthropicBaseIncludesV1(baseURL: string): boolean {
+  return /\/v1$/i.test(stripTrailingSlashes(baseURL));
+}
+
+/**
+ * True when the Base URL is only a scheme + host (optional port), with no path.
+ * Claude Code style ANTHROPIC_BASE_URL values are bare origins.
+ */
+export function isBareOriginBaseURL(baseURL: string): boolean {
+  const trimmed = stripTrailingSlashes(baseURL);
+  if (!trimmed) return false;
+  try {
+    const parsed = new URL(trimmed);
+    return !parsed.pathname || parsed.pathname === "/";
+  } catch {
+    // Non-absolute strings: treat as bare only when there is no path segment.
+    return !trimmed.includes("/") || /^[a-z][a-z0-9+.-]*:\/\/[^/]+$/i.test(trimmed);
+  }
+}
+
+/**
+ * Normalize a stored Anthropic-compat Base URL for @ai-sdk/anthropic.
+ * - Bare hosts gain a /v1 suffix (Claude Code style → SDK style).
+ * - Bases that already end in /v1 are left unchanged.
+ * - Other path prefixes (custom proxies) are left unchanged so chat keeps
+ *   requesting `{prefix}/messages` rather than `{prefix}/v1/messages`.
+ */
+export function normalizeAnthropicSdkBaseURL(baseURL: string): string {
+  const trimmed = stripTrailingSlashes(baseURL);
+  if (!trimmed) return trimmed;
+  if (anthropicBaseIncludesV1(trimmed)) return trimmed;
+  if (!isBareOriginBaseURL(trimmed)) return trimmed;
+  return `${trimmed}/v1`;
+}