feat(cart): POST /store/carts (#6273)

Depends on #6262

packages/medusa/src/api-v2/store/carts/middlewares.ts

@@ -1,7 +1,7 @@
-import { transformQuery } from "../../../api/middlewares"
+import { transformBody, transformQuery } from "../../../api/middlewares"
 import { MiddlewareRoute } from "../../../loaders/helpers/routing/types"
 import * as QueryConfig from "./query-config"
-import { StoreGetCartsCartParams } from "./validators"
+import { StoreGetCartsCartParams, StorePostCartReq } from "./validators"
 
 export const storeCartRoutesMiddlewares: MiddlewareRoute[] = [
   {
@@ -14,4 +14,9 @@ export const storeCartRoutesMiddlewares: MiddlewareRoute[] = [
       ),
     ],
   },
+  {
+    method: ["POST"],
+    matcher: "/store/carts",
+    middlewares: [transformBody(StorePostCartReq)],
+  },
 ]

packages/medusa/src/api-v2/store/carts/route.ts

@@ -0,0 +1,23 @@
+import { createCartsWorkflow } from "@medusajs/core-flows"
+import { CreateCartDTO } from "@medusajs/types"
+import { MedusaRequest, MedusaResponse } from "../../../types/routing"
+
+export const POST = async (req: MedusaRequest, res: MedusaResponse) => {
+  const createCartWorkflow = createCartsWorkflow(req.scope)
+  const cartData = [
+    {
+      ...(req.validatedBody as CreateCartDTO),
+    },
+  ]
+
+  const { result, errors } = await createCartWorkflow.run({
+    input: { cartData },
+    throwOnError: false,
+  })
+
+  if (Array.isArray(errors) && errors[0]) {
+    throw errors[0].error
+  }
+
+  res.status(200).json({ cart: result[0] })
+}

packages/medusa/src/api-v2/store/carts/validators.ts

@@ -1,3 +1,55 @@
+import { Type } from "class-transformer"
+import {
+  IsArray,
+  IsInt,
+  IsNotEmpty,
+  IsObject,
+  IsOptional,
+  IsString,
+  ValidateNested,
+} from "class-validator"
 import { FindParams } from "../../../types/common"
 
 export class StoreGetCartsCartParams extends FindParams {}
+
+export class Item {
+  @IsNotEmpty()
+  @IsString()
+  variant_id: string
+
+  @IsNotEmpty()
+  @IsInt()
+  quantity: number
+}
+
+export class StorePostCartReq {
+  @IsOptional()
+  @IsString()
+  region_id?: string
+
+  @IsOptional()
+  @IsString()
+  customer_id?: string
+
+  @IsOptional()
+  @IsString()
+  email?: string
+
+  @IsOptional()
+  @IsString()
+  currency_code?: string
+
+  @IsOptional()
+  @IsArray()
+  @ValidateNested({ each: true })
+  @Type(() => Item)
+  items?: Item[]
+
+  @IsString()
+  @IsOptional()
+  sales_channel_id?: string
+
+  @IsObject()
+  @IsOptional()
+  metadata?: Record<string, unknown>
+}