feat: Add SSH key authentication and custom port support (#97)

* feat: Add SSH key authentication and custom port support

- Add SSH key authentication support with three modes: password, key, or both
- Add custom SSH port support (defaults to 22)
- Create SSHKeyInput component with file upload and paste modes
- Update database schema with auth_type, ssh_key, ssh_key_passphrase, and ssh_port columns
- Update TypeScript interfaces to support new authentication fields
- Update SSH services to handle key authentication and custom ports
- Update ServerForm with authentication type selection and SSH port field
- Update API routes with validation for new fields
- Add proper cleanup for temporary SSH key files
- Support for encrypted SSH keys with passphrase protection
- Maintain backward compatibility with existing password-only servers

* fix: Resolve TypeScript build errors and improve type safety

- Replace || operators with ?? (nullish coalescing) for better type safety
- Add proper null checks for password fields in SSH services
- Fix JSDoc type annotations for better TypeScript inference
- Update error object types to use Record<keyof CreateServerData, string>
- Ensure all SSH authentication methods handle optional fields correctly

src/app/api/servers/[id]/route.ts

@@ -52,16 +52,55 @@ export async function PUT(
     }
 
     const body = await request.json();
-    const { name, ip, user, password }: CreateServerData = body;
+    const { name, ip, user, password, auth_type, ssh_key, ssh_key_passphrase, ssh_port }: CreateServerData = body;
 
     // Validate required fields
-    if (!name || !ip || !user || !password) {
+    if (!name || !ip || !user) {
       return NextResponse.json(
-        { error: 'Missing required fields' },
+        { error: 'Missing required fields: name, ip, and user are required' },
         { status: 400 }
       );
     }
 
+    // Validate SSH port
+    if (ssh_port !== undefined && (ssh_port < 1 || ssh_port > 65535)) {
+      return NextResponse.json(
+        { error: 'SSH port must be between 1 and 65535' },
+        { status: 400 }
+      );
+    }
+
+    // Validate authentication based on auth_type
+    const authType = auth_type ?? 'password';
+    
+    if (authType === 'password' || authType === 'both') {
+      if (!password?.trim()) {
+        return NextResponse.json(
+          { error: 'Password is required for password authentication' },
+          { status: 400 }
+        );
+      }
+    }
+    
+    if (authType === 'key' || authType === 'both') {
+      if (!ssh_key?.trim()) {
+        return NextResponse.json(
+          { error: 'SSH key is required for key authentication' },
+          { status: 400 }
+        );
+      }
+    }
+
+    // Check if at least one authentication method is provided
+    if (authType === 'both') {
+      if (!password?.trim() && !ssh_key?.trim()) {
+        return NextResponse.json(
+          { error: 'At least one authentication method (password or SSH key) is required' },
+          { status: 400 }
+        );
+      }
+    }
+
     const db = getDatabase();
     
     // Check if server exists
@@ -73,7 +112,16 @@ export async function PUT(
       );
     }
 
-    const result = db.updateServer(id, { name, ip, user, password });
+    const result = db.updateServer(id, { 
+      name, 
+      ip, 
+      user, 
+      password, 
+      auth_type: authType,
+      ssh_key,
+      ssh_key_passphrase,
+      ssh_port: ssh_port ?? 22
+    });
     
     return NextResponse.json(
       { 

src/app/api/servers/route.ts

@@ -20,18 +20,66 @@ export async function GET() {
 export async function POST(request: NextRequest) {
   try {
     const body = await request.json();
-    const { name, ip, user, password }: CreateServerData = body;
+    const { name, ip, user, password, auth_type, ssh_key, ssh_key_passphrase, ssh_port }: CreateServerData = body;
 
     // Validate required fields
-    if (!name || !ip || !user || !password) {
+    if (!name || !ip || !user) {
       return NextResponse.json(
-        { error: 'Missing required fields' },
+        { error: 'Missing required fields: name, ip, and user are required' },
         { status: 400 }
       );
     }
 
+    // Validate SSH port
+    if (ssh_port !== undefined && (ssh_port < 1 || ssh_port > 65535)) {
+      return NextResponse.json(
+        { error: 'SSH port must be between 1 and 65535' },
+        { status: 400 }
+      );
+    }
+
+    // Validate authentication based on auth_type
+    const authType = auth_type ?? 'password';
+    
+    if (authType === 'password' || authType === 'both') {
+      if (!password?.trim()) {
+        return NextResponse.json(
+          { error: 'Password is required for password authentication' },
+          { status: 400 }
+        );
+      }
+    }
+    
+    if (authType === 'key' || authType === 'both') {
+      if (!ssh_key?.trim()) {
+        return NextResponse.json(
+          { error: 'SSH key is required for key authentication' },
+          { status: 400 }
+        );
+      }
+    }
+
+    // Check if at least one authentication method is provided
+    if (authType === 'both') {
+      if (!password?.trim() && !ssh_key?.trim()) {
+        return NextResponse.json(
+          { error: 'At least one authentication method (password or SSH key) is required' },
+          { status: 400 }
+        );
+      }
+    }
+
     const db = getDatabase();
-    const result = db.createServer({ name, ip, user, password });
+    const result = db.createServer({ 
+      name, 
+      ip, 
+      user, 
+      password, 
+      auth_type: authType,
+      ssh_key,
+      ssh_key_passphrase,
+      ssh_port: ssh_port ?? 22
+    });
     
     return NextResponse.json(
       {