Feat: Add customer search controller (#1111)

* add controllers directory and loaders

* move controllers to pure functions

* controller refactor

* update imports

packages/medusa/src/controllers/customers/index.ts

@@ -0,0 +1,2 @@
+import listAndCount from "./list-customers"
+export default { listAndCount }

packages/medusa/src/controllers/customers/list-customers.ts

@@ -0,0 +1,49 @@
+import { omit, pickBy } from "lodash"
+import { AdminGetCustomersParams } from "../../api/routes/admin/customers/list-customers"
+import { AdminCustomersListRes } from "../../api"
+import { CustomerService } from "../../services"
+import { FindConfig } from "../../types/common"
+import { validator } from "../../utils/validator"
+import { Customer } from "../../models/customer"
+
+const listAndCount = async (
+  scope,
+  query,
+  body,
+  context = {}
+): Promise<AdminCustomersListRes> => {
+  const validatedQueryParams = await validator(AdminGetCustomersParams, query)
+
+  const customerService: CustomerService = scope.resolve("customerService")
+
+  let expandFields: string[] = []
+  if (validatedQueryParams.expand) {
+    expandFields = validatedQueryParams.expand.split(",")
+  }
+
+  const listConfig: FindConfig<Customer> = {
+    relations: expandFields,
+    skip: validatedQueryParams.offset,
+    take: validatedQueryParams.limit,
+  }
+
+  const filterableFields = omit(validatedQueryParams, [
+    "limit",
+    "offset",
+    "expand",
+  ])
+
+  const [customers, count] = await customerService.listAndCount(
+    pickBy(filterableFields, (val) => typeof val !== "undefined"),
+    listConfig
+  )
+
+  return {
+    customers,
+    count,
+    offset: validatedQueryParams.offset,
+    limit: validatedQueryParams.limit,
+  }
+}
+
+export default listAndCount