add rewrite rule test, fix startup problem

deps.ts

@@ -11,4 +11,5 @@ export { extname } from 'https://deno.land/[email protected]/path/mod.ts';
 export { brightGreen } from 'https://deno.land/[email protected]/fmt/colors.ts';
 export type { Evt } from 'https://deno.land/x/evt/mod.ts';
 import sample from 'https://dev.jspm.io/lodash-es/sample';
-export { sample };
+import isEqual from 'https://dev.jspm.io/lodash-es/isEqual';
+export { sample, isEqual };

findPathInDb.ts

@@ -0,0 +1,32 @@
+import { JsonDB } from './server.ts';
+
+export const findPathInDb = (
+  db: JsonDB,
+  routePaths: string[],
+  rewriteRules?: Record<string, string[]>
+) => {
+  const matchedRewriteKey =
+    rewriteRules &&
+    Object.keys(rewriteRules).find(
+      (rewriteKey) => rewriteKey === routePaths.join('/')
+    );
+  const appliedRoutePaths = matchedRewriteKey
+    ? rewriteRules![matchedRewriteKey]
+    : routePaths;
+  return appliedRoutePaths.reduce((subDB, routePart) => {
+    if (routePart == null || routePart === '') {
+      return subDB;
+    }
+    const id = Number(routePart);
+    if (Array.isArray(subDB) && id !== NaN) {
+      return (subDB as { id: number }[]).find(
+        (item) => item.id === id
+      ) as Record<string, unknown>;
+    }
+    if (routePart && routePart in subDB) {
+      return subDB[routePart] as Record<string, unknown>;
+    }
+    console.error(`${routePart} not found in ${JSON.stringify(subDB)}!`);
+    return subDB;
+  }, db);
+};

findPathInDb_test.ts

@@ -0,0 +1,39 @@
+import { assertEquals } from 'https://deno.land/[email protected]/testing/asserts.ts';
+import { findPathInDb } from './findPathInDb.ts';
+
+const { test } = Deno;
+
+test({
+  name: 'match simple path',
+  fn: () => {
+    const db = { test: { levelTwo: '1' } };
+
+    const matched = findPathInDb(db, ['test', 'levelTwo']);
+
+    assertEquals(matched, '1');
+  },
+});
+
+test({
+  name: 'match ids',
+  fn: () => {
+    const db = { test: { id: 3, levelTwo: '1' } };
+
+    const matched = findPathInDb(db, ['test', '3']);
+
+    assertEquals(matched, { id: 3, levelTwo: '1' });
+  },
+});
+
+test({
+  name: 'match simple rewritten path',
+  fn: () => {
+    const db = { test: { levelTwo: '1' } };
+
+    const matched = findPathInDb(db, ['yolo'], {
+      yolo: ['test', 'levelTwo'],
+    });
+
+    assertEquals(matched, '1');
+  },
+});

handleRequest.ts

@@ -1,29 +1,21 @@
 import { ServerRequest } from './deps.ts';
+import { findPathInDb } from './findPathInDb.ts';
+import { JsonDB, RewriteRules } from './server.ts';
 
-export const handleRequest = (db: Record<string, unknown>) => (
+export const handleRequest = (db: JsonDB, rewriteRules?: RewriteRules) => (
   request: ServerRequest
 ) => {
   const [, ...routePaths] = request.url.split('/');
+  const isFile = routePaths[routePaths.length - 1].includes('.');
+  if (isFile) {
+    request.respond({
+      status: 404,
+      body: 'Files are not yet handled',
+    });
+    return;
+  }
 
-  const resource = routePaths.reduce<Record<string, unknown>>(
-    (subDB, routePart) => {
-      if (routePart == null || routePart === '') {
-        return subDB;
-      }
-      const id = Number(routePart);
-      if (Array.isArray(subDB) && id !== NaN) {
-        return (subDB as { id: number }[]).find(
-          (item) => item.id === id
-        ) as Record<string, unknown>;
-      }
-      if (routePart && routePart in subDB) {
-        return subDB[routePart] as Record<string, unknown>;
-      }
-      console.error(`${routePart} not found in ${JSON.stringify(subDB)}!`);
-      return subDB;
-    },
-    db
-  );
+  const resource = findPathInDb(db, routePaths, rewriteRules);
 
   const origin = request.headers.get('origin');
   const headers = new Headers({

server.ts

@@ -4,6 +4,7 @@ import { handleRequest } from './handleRequest.ts';
 import { listenAndServe } from './listenAndServe.ts';
 
 export type JsonDB = Record<string, unknown>;
+export type RewriteRules = Record<string, string[]>;
 
 const isString = (value: unknown) =>
   typeof value === 'string' || value instanceof String;
@@ -12,25 +13,30 @@ export interface Options {
   dbPathOrObject: string | JsonDB;
   port: number;
   watchDB: boolean;
+  rewriteRules: RewriteRules;
 }
 
 const defaultOptions: Options = {
   dbPathOrObject: './db.json',
   port: 8000,
   watchDB: true,
+  rewriteRules: { yolo: ['profile', 'user'] },
 };
 
 export const jsonServer = async (options: Partial<Options>) => {
-  const { dbPathOrObject, port, watchDB } = { ...defaultOptions, ...options };
+  const { dbPathOrObject, port, watchDB, rewriteRules } = {
+    ...defaultOptions,
+    ...options,
+  };
 
   let handler = (req: ServerRequest) => {
     req.respond({ body: 'loading...' });
   };
   const server = listenAndServe({ port }, (req) => handler(req));
   console.log(`JSON server is running on Port ${port}`);
 
-  const handleNewDb = (db: Object) => {
-    handler = handleRequest(db as Record<string, unknown>);
+  const handleNewDb = (db: JsonDB) => {
+    handler = handleRequest(db, rewriteRules);
   };
   const aborter = new AbortController();
   const { signal } = aborter;
@@ -80,7 +86,7 @@ if (import.meta.main) {
     port: cliArgs.port,
     watchDB: cliArgs.watchDB,
   });
-  if (cliArgs) {
+  if (cliArgs.testRun) {
     console.log('testRun flag detected, closing the server...');
     await new Promise((resolve) => setTimeout(resolve, 1000));
     server.close();