Implement claude max auth

src/claude/oauth-setup.ts

@@ -0,0 +1,59 @@
+import { mkdir, writeFile } from "fs/promises";
+import { join } from "path";
+import { homedir } from "os";
+
+interface OAuthCredentials {
+  accessToken: string;
+  refreshToken: string;
+  expiresAt: string;
+}
+
+interface ClaudeCredentialsInput {
+  claudeAiOauth: {
+    accessToken: string;
+    refreshToken: string;
+    expiresAt: number;
+    scopes: string[];
+  };
+}
+
+export async function setupOAuthCredentials(credentialsJson: string) {
+  try {
+    // Parse the credentials JSON
+    const parsedCredentials: ClaudeCredentialsInput = JSON.parse(credentialsJson);
+    
+    if (!parsedCredentials.claudeAiOauth) {
+      throw new Error("Invalid credentials format: missing claudeAiOauth");
+    }
+
+    const { accessToken, refreshToken, expiresAt } = parsedCredentials.claudeAiOauth;
+    
+    if (!accessToken || !refreshToken || !expiresAt) {
+      throw new Error("Invalid credentials format: missing required OAuth fields");
+    }
+
+    const claudeDir = join(homedir(), ".claude");
+    const credentialsPath = join(claudeDir, ".credentials.json");
+
+    // Create the .claude directory if it doesn't exist
+    await mkdir(claudeDir, { recursive: true });
+
+    // Create the credentials JSON structure
+    const credentialsData = {
+      claudeAiOauth: {
+        accessToken,
+        refreshToken,
+        expiresAt,
+        scopes: ["user:inference", "user:profile"],
+      },
+    };
+
+    // Write the credentials file
+    await writeFile(credentialsPath, JSON.stringify(credentialsData, null, 2));
+
+    console.log(`OAuth credentials written to ${credentialsPath}`);
+  } catch (error) {
+    const errorMessage = error instanceof Error ? error.message : String(error);
+    throw new Error(`Failed to setup OAuth credentials: ${errorMessage}`);
+  }
+}