Started to implement server

vendor/deno.land/x/oak@v12.1.0/helpers.ts

@@ -0,0 +1,53 @@
+// Copyright 2018-2022 the oak authors. All rights reserved. MIT license.
+
+/**
+ * A collection of APIs to help assist in creating middleware.
+ *
+ * @module
+ */
+
+import type { Context } from "./context.ts";
+import type { RouterContext } from "./router.ts";
+import { isRouterContext } from "./util.ts";
+
+interface GetQueryOptionsBase {
+  /** The return value should be a `Map` instead of a record object. */
+  asMap?: boolean;
+
+  /** Merge in the context's `.params`.  This only works when a `RouterContext`
+   * is passed. */
+  mergeParams?: boolean;
+}
+
+interface GetQueryOptionsAsMap extends GetQueryOptionsBase {
+  /** The return value should be a `Map` instead of a record object. */
+  asMap: true;
+}
+
+export type GetParamsOptions = GetQueryOptionsBase | GetQueryOptionsAsMap;
+
+/** Given a context, return the `.request.url.searchParams` as a `Map` of keys
+ * and values of the params. */
+export function getQuery(
+  ctx: Context | RouterContext<string>,
+  options: GetQueryOptionsAsMap,
+): Map<string, string>;
+/** Given a context, return the `.request.url.searchParams` as a record object
+ * of keys and values of the params. */
+export function getQuery(
+  ctx: Context | RouterContext<string>,
+  options?: GetQueryOptionsBase,
+): Record<string, string>;
+export function getQuery(
+  ctx: Context | RouterContext<string>,
+  { mergeParams, asMap }: GetParamsOptions = {},
+): Map<string, string> | Record<string, string> {
+  const result: Record<string, string> = {};
+  if (mergeParams && isRouterContext(ctx)) {
+    Object.assign(result, ctx.params);
+  }
+  for (const [key, value] of ctx.request.url.searchParams) {
+    result[key] = value;
+  }
+  return asMap ? new Map(Object.entries(result)) : result;
+}