Adding UrlShortener (thombergs#219)

Author: ajibade3210

nodejs/url-shortener/urlbackend/.env

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+MONGO_URI= mongodb+srv://ajibadee:[email protected]/?retryWrites=true&w=majority
+DOMAIN_URL=http://localhost:3333

nodejs/url-shortener/urlbackend/Url.js

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+const mongoose = require("mongoose");
+
+const UrlSchema = new mongoose.Schema({
+  urlId: {
+    type: String,
+    required: true,
+  },
+  origUrl: {
+    type: String,
+    required: true,
+  },
+  shortUrl: {
+    type: String,
+    required: true,
+  },
+  clicks: {
+    type: Number,
+    required: true,
+    default: 0,
+  },
+  date: {
+    type: String,
+    default: Date.now,
+  },
+});
+
+module.exports = mongoose.model("Url", UrlSchema);

nodejs/url-shortener/urlbackend/Util/util.js

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+function validateUrl(value) {
+  var urlPattern = new RegExp(
+    "^(https?:\\/\\/)?" + // validate protocol
+      "((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|" + // validate domain name
+      "((\\d{1,3}\\.){3}\\d{1,3}))" + // validate OR ip (v4) address
+      "(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*" + // validate port and path
+      "(\\?[;&a-z\\d%_.~+=-]*)?" + // validate query string
+      "(\\#[-a-z\\d_]*)?$",
+    "i"
+  );
+
+  return !!urlPattern.test(value);
+}
+
+module.exports = { validateUrl };

nodejs/url-shortener/urlbackend/index.js

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+const dotenv = require("dotenv");
+const express = require("express");
+const cors = require("cors");
+const mongoose = require("mongoose");
+const shortid = require("shortid");
+const Url = require("./Url");
+const utils = require("./Util/util");
+
+// configure dotenv
+dotenv.config();
+const app = express();
+
+// cors for cross origin requesters to the frontend application
+app.use(cors());
+//
+app.use(express.json());
+
+// Database connection
+mongoose
+  .connect(process.env.MONGO_URI, {
+    useNewUrlParser: true,
+    useUnifiedTopology: true,
+  })
+  .then(() => {
+    console.log(`Db Connected`);
+  })
+  .catch(err => {
+    console.log(err.message);
+  });
+
+// get all saved URLs
+app.get("/all", async (req, res, next) => {
+  Url.find((error, data) => {
+    if (error) {
+      return next(error);
+    } else {
+      res.json(data);
+    }
+  });
+});
+
+// URL shortener endpoint
+app.post("/short", async (req, res) => {
+  console.log("HERE", req.body.url);
+  const { origUrl } = req.body;
+  const base = process.env.DOMAIN_URL;
+
+  const urlId = shortid.generate();
+  if (utils.validateUrl(origUrl)) {
+    try {
+      let url = await Url.findOne({ origUrl });
+      if (url) {
+        res.json(url);
+      } else {
+        const shortUrl = `${base}/${urlId}`;
+
+        url = new Url({
+          origUrl,
+          shortUrl,
+          urlId,
+          date: new Date(),
+        });
+
+        await url.save();
+        res.json(url);
+      }
+    } catch (err) {
+      console.log(err);
+      res.status(500).json("Server Error");
+    }
+  } else {
+    res.status(400).json("Invalid Original Url");
+  }
+});
+
+// redirect endpoint
+app.get("/:urlId", async (req, res) => {
+  try {
+    const url = await Url.findOne({ urlId: req.params.urlId });
+    console.log(url);
+    if (url) {
+      url.clicks++;
+      url.save();
+      return res.redirect(url.origUrl);
+    } else res.status(404).json("Not found");
+  } catch (err) {
+    console.log(err);
+    res.status(500).json("Server Error");
+  }
+});
+
+// Port Listenning on 3333
+const PORT = process.env.PORT || 3333;
+app.listen(PORT, () => {
+  console.log(`Server is running at PORT ${PORT}`);
+});