feat: add createLink route

bruno/Create New Link.bru

@@ -0,0 +1,18 @@
+meta {
+  name: Create New Link
+  type: http
+  seq: 2
+}
+
+post {
+  url: http://localhost:5050/api/v1/links
+  body: json
+  auth: none
+}
+
+body:json {
+  {
+    "longUrl": "http://github.com/HelloWorld",
+    "customCode": "hiii"
+  }
+}

bruno/bruno.json

@@ -0,0 +1,9 @@
+{
+  "version": "1",
+  "name": "kzilla.xyz",
+  "type": "collection",
+  "ignore": [
+    "node_modules",
+    ".git"
+  ]
+}

src/controllers/links-controller.ts

@@ -1 +1,47 @@
-// controller functions
+import type { Context } from "hono";
+import { createLinkSchema } from "../models/links";
+import { createLink, fetchLink } from "../services/link-service";
+import { generateRandomCode } from "../utils/links";
+import { BackendError } from "../utils/errors";
+import { getConnInfo } from "@hono/node-server/conninfo";
+
+/**
+@summary Validates the request body and creates a new link
+*/
+export async function handleCreateLink(c: Context) {
+  const ipAddress = getConnInfo(c).remote.address || "::1";
+  const reqBody = await c.req.json();
+  const { longUrl, customCode } = await createLinkSchema.parseAsync(reqBody);
+
+  let shortCode = customCode ?? generateRandomCode(6);
+  let analyticsCode = generateRandomCode(6);
+  let linkId = generateRandomCode(12);
+
+  const shortCodeConflict = await fetchLink(shortCode, analyticsCode, linkId);
+
+  if (shortCodeConflict) {
+    if (customCode && shortCodeConflict.customCode === customCode) {
+      throw new BackendError("CONFLICT", {
+        message: "CUSTOM_CODE_CONFLICT",
+        details: "The custom url you provided already exists",
+      });
+    }
+
+    // TODO: possiblity of bad practice here... check later
+    console.log("DEBUG: Conflicts occured, retrying");
+    shortCode = generateRandomCode(6);
+    analyticsCode = generateRandomCode(6);
+    linkId = generateRandomCode(12);
+  }
+
+  const createLinkRes = await createLink(
+    longUrl,
+    shortCode,
+    analyticsCode,
+    linkId,
+    ipAddress,
+  );
+
+  console.log(createLinkRes);
+  return c.json({ message: "Link created successfully" });
+}

src/models/links.ts

@@ -0,0 +1,29 @@
+import { z } from "zod";
+
+export const linkSchema = z.object({
+  linkId: z.string().min(10),
+  clicks: z.number().default(0),
+  analyticsCode: z.string().trim().min(5),
+  longUrl: z.string().url().trim().min(5),
+  customCode: z.string().trim().min(4).max(25).optional(),
+  creatorIpAddress: z.string().ip().optional().default("::1"),
+  logs: z
+    .array(
+      z.object({
+        ipAddress: z.string().ip(),
+        timestamp: z.number(),
+      }),
+    )
+    .optional(),
+  // * This naming is followed to keep it backward compatible don't try to improve it Lol'
+  enabled: z.boolean().default(true),
+  timestamp: z.date().default(new Date()),
+});
+
+export const createLinkSchema = linkSchema.pick({
+  longUrl: true,
+  customCode: true,
+});
+
+export type LinkSchemaType = z.infer<typeof linkSchema>;
+export type CreateLinkSchemaType = z.infer<typeof createLinkSchema>;

src/routes/index.ts

@@ -1,8 +1,12 @@
-import { Hono } from 'hono';
-import linkRouter from './links-router';
+import { Hono } from "hono";
+import linkRouter from "./link-router";
 
 const appRouter = new Hono();
 
-appRouter.route('/links', linkRouter);
+appRouter.get("/", (c) => {
+  return c.text("Hello World!");
+});
+
+appRouter.route("/links", linkRouter);
 
 export default appRouter;

src/routes/link-router.ts

@@ -0,0 +1,14 @@
+import { Hono } from "hono";
+import { handleCreateLink } from "../controllers/links-controller";
+
+const linkRouter = new Hono();
+
+// linkRouter.get("/me", handleFetchMyLinks);
+// linkRouter.get("/:shortCode", handleFetchLink);
+
+linkRouter.post("/", handleCreateLink);
+
+// linkRouter.put("/", handleUpdateLink);
+// linkRouter.put("/flush", handleFlushLinks);
+
+export default linkRouter;

src/services/link-service.ts

@@ -0,0 +1,46 @@
+import type { LinkSchemaType } from "../models/links";
+import db from "../utils/db";
+import { BackendError } from "../utils/errors";
+
+export async function fetchLink(
+  shortCode: string,
+  analyticsCode?: string,
+  linkId?: string,
+) {
+  try {
+    const linksCollection = (await db()).collection<LinkSchemaType>("links");
+
+    return await linksCollection.findOne({
+      shortCode,
+      analyticsCode,
+      linkId,
+    });
+  } catch (err) {
+    throw new BackendError("INTERNAL_ERROR", {
+      message: "Error while fetch a link",
+      details: err,
+    });
+  }
+}
+
+export async function createLink(
+  longUrl: string,
+  shortCode: string,
+  analyticsCode: string,
+  linkId: string,
+  ipAddress: string,
+) {
+  const linksCollection = (await db()).collection<LinkSchemaType>("links");
+
+  return await linksCollection.insertOne({
+    linkId,
+    longUrl,
+    customCode: shortCode,
+    analyticsCode,
+    clicks: 0,
+    creatorIpAddress: ipAddress,
+    enabled: true,
+    timestamp: new Date(),
+    logs: [],
+  });
+}