[DripTide CI check] #239 Add Zod validation pipe and DTO transformer for uniform request parsing

src/common/decorators/zod-body.decorator.ts

@@ -0,0 +1,7 @@
+import { Body } from '@nestjs/common';
+import { ZodType } from 'zod';
+import { ZodValidationPipe, ZodValidationPipeOptions } from '../pipes/zod-validation.pipe';
+
+export function ZodBody<T>(schema: ZodType<T>, options?: ZodValidationPipeOptions) {
+  return Body(new ZodValidationPipe(schema, options));
+}

src/common/decorators/zod-param.decorator.ts

@@ -0,0 +1,7 @@
+import { Param } from '@nestjs/common';
+import { ZodType } from 'zod';
+import { ZodValidationPipe, ZodValidationPipeOptions } from '../pipes/zod-validation.pipe';
+
+export function ZodParam<T>(schema: ZodType<T>, options?: ZodValidationPipeOptions) {
+  return Param(new ZodValidationPipe(schema, options));
+}

src/common/decorators/zod-query.decorator.ts

@@ -0,0 +1,7 @@
+import { Query } from '@nestjs/common';
+import { ZodType } from 'zod';
+import { ZodValidationPipe, ZodValidationPipeOptions } from '../pipes/zod-validation.pipe';
+
+export function ZodQuery<T>(schema: ZodType<T>, options?: ZodValidationPipeOptions) {
+  return Query(new ZodValidationPipe(schema, options));
+}

src/common/pipes/index.ts

@@ -1,5 +1 @@
-/**
- * Barrel for the shared pipes. Prefer importing from `@common/pipes` (or this
- * path) so a pipe is added in exactly one place and every consumer picks it up.
- */
 export * from './zod-validation.pipe';

src/common/pipes/zod-validation.pipe.spec.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, beforeEach } from 'vitest';
 import { ArgumentMetadata } from '@nestjs/common';
 import { z } from 'zod';
 import { ZodValidationPipe } from './zod-validation.pipe';

src/modules/example/example.controller.ts

@@ -0,0 +1,11 @@
+import { Controller, Post, Body } from '@nestjs/common';
+import { ZodValidationPipe } from '../../common/pipes/zod-validation.pipe';
+import { createUserSchema, CreateUserDto } from './example.dto';
+
+@Controller('example')
+export class ExampleController {
+  @Post()
+  createUser(@Body(new ZodValidationPipe(createUserSchema)) dto: CreateUserDto): CreateUserDto {
+    return dto;
+  }
+}

src/modules/example/example.dto.ts

@@ -0,0 +1,9 @@
+import { z } from 'zod';
+
+export const createUserSchema = z.object({
+  name: z.string().min(1, 'Name is required'),
+  email: z.string().email('Invalid email address'),
+  age: z.number().int().positive().optional(),
+});
+
+export type CreateUserDto = z.infer<typeof createUserSchema>;