feat(auth): add anthropic api key storage and cli auth

src/cli/anthropic-auth.ts

@@ -0,0 +1,56 @@
+import type { Command } from 'commander';
+import readline from 'readline';
+import { loadStoredAnthropicAuth, storeAnthropicAuth } from '../auth/index.js';
+
+async function promptHidden(question: string): Promise<string> {
+  const rl = readline.createInterface({ input: process.stdin, output: process.stdout, terminal: true });
+  const rlAny = rl as unknown as { stdoutMuted?: boolean; _writeToOutput?: (s: string) => void };
+  rlAny.stdoutMuted = true;
+
+  rlAny._writeToOutput = (s: string) => {
+    if (!rlAny.stdoutMuted) {
+      process.stdout.write(s);
+      return;
+    }
+    if (s.includes('\n')) {
+      process.stdout.write('\n');
+    } else {
+      process.stdout.write('*');
+    }
+  };
+
+  const answer = await new Promise<string>((resolve) => rl.question(question, resolve));
+  rlAny.stdoutMuted = false;
+  rl.close();
+  process.stdout.write('\n');
+  return answer.trim();
+}
+
+export function registerAnthropicAuthCommand(program: Command): void {
+  program
+    .command('anthropic-auth')
+    .description('Store an Anthropic API key (auth.json)')
+    .action(async () => {
+      const existing = loadStoredAnthropicAuth();
+      if (existing) {
+        console.log('Anthropic credential already exists.');
+        console.log('Delete ~/.config/flynn/auth.json anthropic entry if you want to re-authenticate.');
+        process.exit(0);
+      }
+
+      console.log('Anthropic uses API keys for authentication.');
+      console.log('Create a key at: https://console.anthropic.com/settings/keys');
+      console.log('');
+
+      try {
+        const apiKey = await promptHidden('Enter Anthropic API key: ');
+        storeAnthropicAuth(apiKey);
+        console.log('');
+        console.log('Anthropic credential stored in ~/.config/flynn/auth.json');
+      } catch (error) {
+        const message = error instanceof Error ? error.message : String(error);
+        console.error(`Anthropic auth failed: ${message}`);
+        process.exit(1);
+      }
+    });
+}

src/cli/index.ts

@@ -20,6 +20,7 @@ import { registerGdriveAuthCommand } from './gdrive-auth.js';
 import { registerGtasksAuthCommand } from './gtasks-auth.js';
 import { registerOpenaiAuthCommand } from './openai-auth.js';
 import { registerZaiAuthCommand } from './zai-auth.js';
+import { registerAnthropicAuthCommand } from './anthropic-auth.js';
 import { registerSkillsCommand } from './skills.js';
 
 export function createProgram(): Command {
@@ -45,6 +46,7 @@ export function createProgram(): Command {
   registerGtasksAuthCommand(program);
   registerOpenaiAuthCommand(program);
   registerZaiAuthCommand(program);
+  registerAnthropicAuthCommand(program);
   registerSkillsCommand(program);
 
   return program;