http parser

Author: LinusWestling

src/main/java/org/example/httpparser/HttpParser.java

@@ -0,0 +1,56 @@
+package org.example.httpparser;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.HashMap;
+import java.util.Map;
+
+public class HttpParser {
+    public HttpRequest parse(InputStream in) throws IOException {
+        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
+
+        // 1. Request Line
+        String requestLine = reader.readLine();
+        if (requestLine == null || requestLine.isEmpty()) {
+            throw new IOException("The request is empty");
+        }
+
+        String[] parts = requestLine.split(" ");
+        String method = parts[0];
+        String fullPath = parts[1];
+        String version = parts[2];
+
+        String path;
+        String query = null;
+
+        int qIndex = fullPath.indexOf('?');
+        if (qIndex >= 0) {
+            path = fullPath.substring(0, qIndex);
+            query = fullPath.substring(qIndex + 1);
+        } else {
+            path = fullPath;
+        }
+
+        // 2. Headers
+        Map<String, String> headers = new HashMap<>();
+        String line;
+        while (!(line = reader.readLine()).isEmpty()) {
+            int colon = line.indexOf(':');
+            String key = line.substring(0, colon).trim();
+            String value = line.substring(colon + 1).trim();
+            headers.put(key, value);
+        }
+
+        // 3. Body
+        byte[] body = new byte[0];
+        if (headers.containsKey("Content-Length")) {
+            int length = Integer.parseInt(headers.get("Content-Lenght"));
+            body = in.readNBytes(length);
+        }
+
+        return new HttpRequest(method, path, query, version, headers, body);
+
+    }
+}

src/main/java/org/example/httpparser/HttpRequest.java

@@ -0,0 +1,12 @@
+package org.example.httpparser;
+
+import java.util.Map;
+
+public record HttpRequest(
+        String method,
+        String path,
+        String queryString,
+        String httpVersion,
+        Map<String, String> headers,
+        byte[] body
+) {}