feat: Create layerValidator.ts with layer validation functions

backend/src/layerValidator.ts

@@ -0,0 +1,121 @@
+import { FastifyRequest, FastifyReply } from 'fastify';
+
+// Type definitions
+interface Layer {
+  id?: string;
+  project_id?: string;
+  name?: string;
+  visible?: number;
+  locked?: number;
+  color?: string;
+  line_type?: string;
+  transparency?: number;
+  sort_order?: number;
+  created_at?: string;
+}
+
+// Validate layer creation data
+export async function validateLayerCreation(request: FastifyRequest, reply: FastifyReply) {
+  const { name, visible, locked, color, line_type, transparency, sort_order } = request.body as Layer;
+  
+  // Validate name
+  if (name !== undefined && (typeof name !== 'string' || name.trim().length === 0)) {
+    return reply.status(400).send({ error: 'Invalid layer name' });
+  }
+  
+  // Validate visible
+  if (visible !== undefined && typeof visible !== 'number') {
+    return reply.status(400).send({ error: 'Visible must be a number' });
+  }
+  
+  // Validate locked
+  if (locked !== undefined && typeof locked !== 'number') {
+    return reply.status(400).send({ error: 'Locked must be a number' });
+  }
+  
+  // Validate color
+  if (color !== undefined && typeof color !== 'string') {
+    return reply.status(400).send({ error: 'Color must be a string' });
+  }
+  
+  // Validate line_type
+  if (line_type !== undefined && typeof line_type !== 'string') {
+    return reply.status(400).send({ error: 'Line type must be a string' });
+  }
+  
+  // Validate transparency
+  if (transparency !== undefined && (typeof transparency !== 'number' || transparency < 0 || transparency > 1)) {
+    return reply.status(400).send({ error: 'Transparency must be a number between 0 and 1' });
+  }
+  
+  // Validate sort_order
+  if (sort_order !== undefined && typeof sort_order !== 'number') {
+    return reply.status(400).send({ error: 'Sort order must be a number' });
+  }
+  
+  // If all validations pass, continue to the next handler
+  return;
+}
+
+// Validate layer update data
+export async function validateLayerUpdate(request: FastifyRequest, reply: FastifyReply) {
+  const { name, visible, locked, color, line_type, transparency, sort_order } = request.body as Partial<Layer>;
+  
+  // Validate name
+  if (name !== undefined && (typeof name !== 'string' || name.trim().length === 0)) {
+    return reply.status(400).send({ error: 'Invalid layer name' });
+  }
+  
+  // Validate visible
+  if (visible !== undefined && typeof visible !== 'number') {
+    return reply.status(400).send({ error: 'Visible must be a number' });
+  }
+  
+  // Validate locked
+  if (locked !== undefined && typeof locked !== 'number') {
+    return reply.status(400).send({ error: 'Locked must be a number' });
+  }
+  
+  // Validate color
+  if (color !== undefined && typeof color !== 'string') {
+    return reply.status(400).send({ error: 'Color must be a string' });
+  }
+  
+  // Validate line_type
+  if (line_type !== undefined && typeof line_type !== 'string') {
+    return reply.status(400).send({ error: 'Line type must be a string' });
+  }
+  
+  // Validate transparency
+  if (transparency !== undefined && (typeof transparency !== 'number' || transparency < 0 || transparency > 1)) {
+    return reply.status(400).send({ error: 'Transparency must be a number between 0 and 1' });
+  }
+  
+  // Validate sort_order
+  if (sort_order !== undefined && typeof sort_order !== 'number') {
+    return reply.status(400).send({ error: 'Sort order must be a number' });
+  }
+  
+  // If all validations pass, continue to the next handler
+  return;
+}
+
+// Validate layer reorder data
+export async function validateLayerReorder(request: FastifyRequest, reply: FastifyReply) {
+  const { layerIds } = request.body as { layerIds: string[] };
+  
+  // Validate layerIds
+  if (!Array.isArray(layerIds)) {
+    return reply.status(400).send({ error: 'Layer IDs must be an array' });
+  }
+  
+  // Validate each layer ID
+  for (const id of layerIds) {
+    if (typeof id !== 'string' || id.trim().length === 0) {
+      return reply.status(400).send({ error: 'Each layer ID must be a non-empty string' });
+    }
+  }
+  
+  // If all validations pass, continue to the next handler
+  return;
+}