refactor(dashboard): split api.py into handler modules

dashboard/handlers/pdf.py

@@ -0,0 +1,62 @@
+"""Markdown → PDF conversion endpoint (delegates to tools/generate_pdf.py)."""
+import json
+import subprocess
+
+import constants
+
+
+class PDFHandlers:
+    """Mixin for /api/pdf."""
+
+    def handle_pdf_post(self):
+        """Convert markdown to PDF (text-based) by spawning the venv python."""
+        try:
+            content_length = int(self.headers['Content-Length'])
+            post_data = self.rfile.read(content_length).decode('utf-8')
+            data = json.loads(post_data)
+
+            markdown_content = data.get('markdown', '')
+            filename = data.get('filename', 'document.pdf')
+
+            if not markdown_content:
+                self.send_json({'error': 'No markdown content'}, 400)
+                return
+
+            venv_python = constants.VENV_PYTHON
+            pdf_script = constants.TOOLS_DIR / 'generate_pdf.py'
+
+            if not venv_python.exists():
+                self.send_json({'error': 'Venv Python not found'}, 500)
+                return
+            if not pdf_script.exists():
+                self.send_json({'error': 'PDF generator script not found'}, 500)
+                return
+
+            input_data = json.dumps({'markdown': markdown_content, 'filename': filename})
+            result = subprocess.run(
+                [str(venv_python), str(pdf_script)],
+                input=input_data.encode('utf-8'),
+                capture_output=True,
+                timeout=30,
+            )
+
+            if result.returncode != 0:
+                error_msg = result.stderr.decode('utf-8', errors='replace')
+                try:
+                    error_json = json.loads(error_msg)
+                    self.send_json(error_json, 500)
+                except Exception:
+                    self.send_json({'error': error_msg}, 500)
+                return
+
+            pdf_bytes = result.stdout
+            self.send_response(200)
+            self.send_header('Content-Type', 'application/pdf')
+            self.send_header('Content-Disposition', f'attachment; filename="{filename}"')
+            self.send_header('Content-Length', str(len(pdf_bytes)))
+            self.end_headers()
+            self.wfile.write(pdf_bytes)
+        except subprocess.TimeoutExpired:
+            self.send_json({'error': 'PDF generation timeout'}, 500)
+        except Exception as e:
+            self.send_json({'error': str(e)}, 500)