Java Support Added (#4)

* Base Python Code

* Python Compiler

* Update Dockerfile

* Update Dockerfile

* Python

* Java Added

* Java Added

Author: codewithvk

Dockerfile

@@ -9,6 +9,13 @@ RUN apt-get update && \
     rm -rf /var/lib/apt/lists/* && \
     apt-get -y install python3
 
+RUN apt update -y && apt-get install -y software-properties-common && \
+    apt-add-repository 'deb http://security.debian.org/debian-security stretch/updates main' && apt-get update -y && \
+    apt-get install -y openjdk-8-jdk-headless && \
+    apt-get clean
+ENV java /usr/lib/jvm/java-8-openjdk-amd64/
+RUN export java
+
 COPY package*.json ./
 
 RUN npm install

api/javaApi.js

@@ -0,0 +1,24 @@
+const express = require('express');
+const { javaCompile} = require('../compiler/java')
+const router = express.Router();
+
+// 
+router.post('/', async (req, res) => {
+    const InputCode = Buffer.from(req.body.code, 'base64').toString('binary')
+    const DeCode = Buffer.from(req.body.input, 'base64').toString('binary')
+    const CentralClass = req?.headers?.class || "Main"
+    let response = await javaCompile(InputCode, DeCode, CentralClass);
+    if (response.statusMes === "Compiler Error") {
+        res.status(202).json(response)
+    } else if (response.statusMes === "Run Time Error") {
+        res.status(201).json(response)
+    } else {
+        res.status(200).json(response)
+    }
+
+});
+
+
+
+
+module.exports = router;

api/pythonApi.js

@@ -1,5 +1,4 @@
 const express = require('express');
-const {  CppCompile } = require('../compiler/cpp');
 const { PythonCompile } = require('../compiler/python');
 const router = express.Router();
 

compiler/java.js

@@ -0,0 +1,138 @@
+const { v4: uuid } = require('uuid');
+const { exec } = require('child_process');
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const saveFile = (file, data) => {
+    return new Promise((resolve, reject) => {
+        fs.writeFile(file, data, function (err) {
+            if (err) {
+                reject(err);
+            } else {
+                resolve([file]);
+            }
+        });
+    });
+};
+
+async function deleteFiles(javaPath, inputPath, exePath) {
+    if (fs.existsSync(javaPath)) {
+        await fs.unlinkSync(javaPath);
+    }
+
+    if (fs.existsSync(inputPath)) {
+        await fs.unlinkSync(inputPath);
+    }
+
+    if (fs.existsSync(exePath)) {
+        await fs.unlinkSync(exePath);
+    }
+}
+
+
+
+function getExecutablePath(fileName) {
+    // console.log(os.platform());
+    if (os.platform() === 'win32') {
+        return `${path.join(__dirname, '..', 'upload', fileName)}.exe`;
+    }
+    if (os.platform() === 'linux') {
+        return `${path.join(__dirname, '..', 'upload', fileName)}`;
+    }
+}
+
+function getRunCommand(input, CentralClass) {
+
+    let path = getExecutablePath("")
+    return `cd ${path} && \  java ${CentralClass} < ${input}`;
+
+}
+
+function getjavaPath(fileName) {
+    return `${path.join(__dirname, '..', 'upload', fileName)}.java`;
+}
+
+function getInputPath(fileName) {
+    return `${path.join(__dirname, '..', 'upload', fileName)}-input.txt`;
+}
+
+function compileProgram(javaPath) {
+    return new Promise((resolve, reject) => {
+        exec(`javac ${javaPath}`, (error, stdout, stderr) => {
+            if (error) {
+                console.log({ error, stdout, stderr })
+                reject({ error, stdout, stderr });
+            } else {
+                console.log({ error, stdout, stderr })
+                resolve({ stdout, stderr });
+            }
+        });
+    });
+}
+
+function runProgram(inputPath, CentralClass) {
+    return new Promise((resolve, reject) => {
+        exec(getRunCommand(inputPath, CentralClass), (error, stdout, stderr) => {
+            if (error) {
+                console.log({ error, stdout, stderr })
+                reject({ error, stdout, stderr });
+            } else {
+                console.log({ error, stdout, stderr })
+                resolve({ stdout, stderr });
+            }
+        });
+    });
+}
+
+
+const javaCompile = async (code, input, CentralClass) => {
+    console.log({ code, input })
+    let state = {
+        stdout: null,
+        stderr: null,
+        statusMes: "",
+    }
+    let uniqueFileName = uuid();
+    // let executePath = getExecutablePath(uniqueFileName)
+    let javaPath = getjavaPath(uniqueFileName)
+    let ipPath = getInputPath(uniqueFileName)
+
+    await saveFile(javaPath, code);
+    await saveFile(ipPath, input);
+
+    try {
+        let { stdout, stderr } = await compileProgram(javaPath);
+        console.log({ stdout, stderr })
+    } catch (err) {
+        state.stderr = err.stderr;
+        state.statusMes = "Compiler Error";
+        deleteFiles(javaPath, ipPath);
+        return state;
+    }
+
+    try {
+        let { stdout, stderr } = await runProgram(ipPath, CentralClass);
+        state.stdout = stdout;
+        state.stderr = stderr;
+        console.log({ stdout, stderr })
+
+    } catch (err) {
+        state.stderr = err.stderr;
+        state.statusMes = "Run Time Error";
+        console.log({ state })
+        deleteFiles(javaPath, ipPath);
+    }
+
+    if (state.stderr === '') {
+        state.stderr = null;
+    }
+    state.statusMes = "Successfully Compiled";
+    await deleteFiles(javaPath, ipPath);
+    return state;
+
+}
+
+
+
+
+module.exports = { javaCompile };

server.js

@@ -12,7 +12,7 @@ app.get('/', (req, res) => {
 })
 app.use('/api', require('./api/cppApi'));
 app.use('/api/python', require('./api/pythonApi'));
-
+app.use('/api/java', require('./api/javaApi'))
 
 app.listen(PORT, () => {
     console.log(`Listening at port ${PORT}`);