feat: create get single product endpoint

src/controllers/admin/products.controller.ts

@@ -106,3 +106,34 @@ export const getAllProducts = async (
     next(error);
   }
 };
+
+export const getSingleProduct = async (
+  request: Request,
+  response: Response,
+  next: NextFunction,
+) => {
+  try {
+    const validationErrors = getValidationResult(request);
+
+    if (validationErrors) {
+      const error = new CustomError(
+        ValidationErrorMessage,
+        400,
+        validationErrors,
+      );
+      return next(error);
+    }
+
+    const product = await Product.findOne({ _id: request.params.productId });
+
+    if (!product)
+      return response
+        .status(404)
+        .json({ message: getNotFoundMessage("Product") });
+
+    response.status(200).json(product.toObject());
+  } catch {
+    const error = new CustomError(ServerErrorMessage);
+    next(error);
+  }
+};

src/routes/admin.routes.ts

@@ -16,6 +16,7 @@ import {
   deleteCategoryChain,
   getAllSanitizer,
   getSingleCategoryChain,
+  getSingleProductChain,
   updateCategoryChain,
 } from "../validations";
 
@@ -68,6 +69,11 @@ router
     createProductChain(),
     productsController.createProduct,
   )
-  .get("/products", getAllSanitizer(), productsController.getAllProducts);
+  .get("/products", getAllSanitizer(), productsController.getAllProducts)
+  .get(
+    "/products/:productId",
+    getSingleProductChain(),
+    productsController.getSingleProduct,
+  );
 
 export default router;

src/validations/admin-products.validation.ts

@@ -1,4 +1,4 @@
-import { body } from "express-validator";
+import { body, param } from "express-validator";
 
 export const createProductChain = () => [
   body("name", "Name is required")
@@ -33,3 +33,10 @@ export const createProductChain = () => [
     .isMongoId()
     .withMessage("Category ID must be valid."),
 ];
+
+export const getSingleProductChain = () =>
+  param("productId", "Invalid product id")
+    .isString()
+    .trim()
+    .notEmpty({ ignore_whitespace: true })
+    .isMongoId();