feat: expand DeepSeek Harness compatibility

src/shared/deepseek-harness-compatibility.ts

@@ -0,0 +1,50 @@
+type DeepSeekHarnessModelProfile = {
+  baseUrl: string
+  protocol: string
+  authentication: string
+}
+
+function isLoopbackHostname(hostname: string): boolean {
+  const normalized = hostname
+    .toLowerCase()
+    .replace(/^\[|\]$/gu, '')
+  return (
+    normalized === 'localhost' ||
+    normalized === '127.0.0.1' ||
+    normalized === '::1'
+  )
+}
+
+export function isDeepSeekHarnessCompatibleBaseUrl(
+  value: string
+): boolean {
+  try {
+    const url = new URL(value)
+    if (
+      !url.hostname ||
+      url.username ||
+      url.password ||
+      url.search ||
+      url.hash
+    ) {
+      return false
+    }
+    return (
+      url.protocol === 'https:' ||
+      (url.protocol === 'http:' &&
+        isLoopbackHostname(url.hostname))
+    )
+  } catch {
+    return false
+  }
+}
+
+export function isDeepSeekHarnessModelProfile(
+  profile: DeepSeekHarnessModelProfile
+): boolean {
+  return (
+    profile.protocol === 'openai-chat-completions' &&
+    profile.authentication === 'api-key' &&
+    isDeepSeekHarnessCompatibleBaseUrl(profile.baseUrl)
+  )
+}