task

src/createServer.js

@@ -1,3 +1,66 @@
+/* eslint-disable max-len */
+/* eslint-disable no-console */
 // Write code here
 // Also, you can create additional files in the src folder
 // and import (require) them here
+const http = require('http');
+const { convertToCase } = require('./convertToCase');
+
+const SUPPORTED_CASES = ['SNAKE', 'KEBAB', 'CAMEL', 'PASCAL', 'UPPER'];
+const TEXT_REQUIRED_MESSAGE =
+  'Text to convert is required. Correct request is: "/<TEXT_TO_CONVERT>?toCase=<CASE_NAME>".';
+const TO_CASE_REQUIRED_MESSAGE =
+  '"toCase" query param is required. Correct request is: "/<TEXT_TO_CONVERT>?toCase=<CASE_NAME>".';
+const INVALID_CASE_MESSAGE =
+  'This case is not supported. Available cases: SNAKE, KEBAB, CAMEL, PASCAL, UPPER.';
+
+function createServer(port) {
+  const server = http.createServer((req, res) => {
+    res.setHeader('Content-Type', 'application/json');
+
+    const requestUrl = new URL(req.url, `http://${req.headers.host}`);
+    const requestPath = requestUrl.pathname;
+    const queryParams = Object.fromEntries(requestUrl.searchParams);
+    const textToConvert = requestPath.slice(1);
+    const errors = [];
+
+    if (!textToConvert) {
+      errors.push({ message: TEXT_REQUIRED_MESSAGE });
+    }
+
+    if (Object.keys(queryParams).length === 0 || !queryParams.toCase) {
+      errors.push({ message: TO_CASE_REQUIRED_MESSAGE });
+    } else if (!SUPPORTED_CASES.includes(queryParams.toCase)) {
+      errors.push({ message: INVALID_CASE_MESSAGE });
+    }
+
+    if (errors.length > 0) {
+      res.statusCode = 400;
+      res.statusMessage = 'Bad request';
+      res.end(JSON.stringify({ errors }));
+
+      return;
+    }
+
+    const { originalCase, convertedText } = convertToCase(
+      textToConvert,
+      queryParams.toCase,
+    );
+
+    res.statusCode = 200;
+    res.statusMessage = 'OK';
+
+    res.end(
+      JSON.stringify({
+        originalCase,
+        targetCase: queryParams.toCase,
+        originalText: textToConvert,
+        convertedText,
+      }),
+    );
+  });
+
+  return server;
+}
+
+module.exports = { createServer };