Allow Gift Card balance lookup in the Storefront API (#193)

* feat: enable balance lookup for gift-cards

packages/medusa/src/api/routes/store/gift-cards/get-gift-card.js

@@ -0,0 +1,41 @@
+import { defaultRelations, defaultFields } from "./"
+
+/**
+ * @oas [get] /gift-cards/{code}
+ * operationId: "GetGiftCardsCode"
+ * summary: "Retrieve Gift Card by Code"
+ * description: "Retrieves a Gift Card by its associated unqiue code."
+ * tags:
+ *   - Region
+ * responses:
+ *   200:
+ *     description: OK
+ *     content:
+ *       application/json:
+ *         schema:
+ *           properties:
+ *             id:
+ *               description: The id of the Gift Card
+ *             code:
+ *               description: The code of the Gift Card
+ *             value:
+ *               description: The original value of the Gift Card.
+ *             balance:
+ *               description: The current balanace of the Gift Card
+ */
+export default async (req, res) => {
+  const { code } = req.params
+
+  try {
+    const giftCardService = req.scope.resolve("giftCardService")
+    const giftCard = await giftCardService.retrieveByCode(code, {
+      select: defaultFields,
+      relations: defaultRelations,
+    })
+
+    res.json({ gift_card: giftCard })
+  } catch (error) {
+    console.log(error)
+    throw error
+  }
+}

packages/medusa/src/api/routes/store/gift-cards/index.js

@@ -0,0 +1,20 @@
+import { Router } from "express"
+import middlewares from "../../../middlewares"
+
+const route = Router()
+
+export default app => {
+  app.use("/gift-cards", route)
+
+  route.get("/:code", middlewares.wrap(require("./get-gift-card").default))
+
+  return app
+}
+
+export const defaultRelations = []
+
+export const defaultFields = ["id", "code", "value", "balance"]
+
+export const allowedRelations = []
+
+export const allowedFields = ["id", "code", "value", "balance"]

packages/medusa/src/api/routes/store/index.js

@@ -12,6 +12,7 @@ import shippingOptionRoutes from "./shipping-options"
 import regionRoutes from "./regions"
 import swapRoutes from "./swaps"
 import variantRoutes from "./variants"
+import giftCardRoutes from "./gift-cards"
 
 const route = Router()
 
@@ -37,6 +38,7 @@ export default (app, container, config) => {
   regionRoutes(route)
   swapRoutes(route)
   variantRoutes(route)
+  giftCardRoutes(route)
 
   return app
 }