network chunk v11

UC/src/network/socket_communicator/socket_communicator_base.ts

@@ -1,24 +1,114 @@
 import { ParsedMessage } from '../message_handler';
 import { OperationHandler } from '../operations_base/operation_handler';
 import ping from "ping";
+import {
+    constants,
+    createCipheriv,
+    createDecipheriv,
+    generateKeyPairSync,
+    privateEncrypt,
+    publicDecrypt,
+    randomBytes
+} from "crypto";
 
 export abstract class SocketCommunicatorBase {
     protected readonly ip: string;
     protected readonly port: number;
     protected readonly operationHandler: OperationHandler;
     protected handlerResult: ParsedMessage | null;
-    protected networkSpeed: number | null = null;  // Estimated network speed in bytes/ms
+    protected networkSpeed: number | null = null;
+
+    protected chunkBuffers: { [messageId: string]: string[] };
+    protected readonly EOP = '<EOP>';
+
+    protected privateKey: string | null;
+    protected publicKey: string | null;
+    protected aesKey: Buffer | null;
+    protected aesIv: Buffer | null;
 
     protected constructor(ip: string, port: number, operationHandler: OperationHandler) {
         this.ip = ip;
         this.port = port;
         this.operationHandler = operationHandler
         this.handlerResult = null;
+        this.chunkBuffers = {};
+
+        this.privateKey = null;
+        this.publicKey = null;
+        this.aesKey = null;
+        this.aesIv = null;
     }
 
     // Getter for the handler result
     getHandlerResult(): ParsedMessage | null {
-        return this.handlerResult;
+        const result = this.handlerResult;
+        this.handlerResult = null;
+        return result;
+    }
+
+    protected generateKeyPair(): void {
+        const { privateKey, publicKey } = generateKeyPairSync('rsa', {
+            modulusLength: 2048,
+            publicKeyEncoding: { type: 'spki', format: 'pem' },
+            privateKeyEncoding: { type: 'pkcs8', format: 'pem' },
+        });
+        this.privateKey = privateKey;
+        this.publicKey = publicKey;
+    }
+
+    protected generateAesKey(): void {
+        this.aesKey = randomBytes(32);
+        this.aesIv = randomBytes(16);
+    }
+
+    protected encryptWithAes(message: string): string {
+        if (!this.aesKey || !this.aesIv) {
+            throw new Error('AES key or IV is not set.');
+        }
+        const cipher = createCipheriv('aes-256-cbc', this.aesKey, this.aesIv);
+        let encrypted = cipher.update(message, 'utf-8');
+        encrypted = Buffer.concat([encrypted, cipher.final()]);
+        return encrypted.toString('base64');
+    }
+
+    protected decryptWithAes(encryptedMessage: string): string {
+        if (!this.aesKey || !this.aesIv) {
+            throw new Error('AES key or IV is not set.');
+        }
+        const decipher = createDecipheriv('aes-256-cbc', this.aesKey, this.aesIv);
+        let decrypted = decipher.update(Buffer.from(encryptedMessage, 'base64'));
+        decrypted = Buffer.concat([decrypted, decipher.final()]);
+        return decrypted.toString('utf-8');
+    }
+
+    protected decryptWithRsa(message: string): string {
+        if (!this.publicKey) {
+            throw new Error('Server public key not set.');
+        }
+        try {
+            const encryptedMessage = Buffer.from(message, 'base64');
+            const decrypted = publicDecrypt(
+                {
+                    key: this.publicKey,
+                    padding: constants.RSA_PKCS1_PADDING,
+                },
+                encryptedMessage
+            );
+            return decrypted.toString('utf-8');
+        } catch (error) {
+            throw new Error('Failed to decrypt RSA message.');
+        }
+    }
+
+    protected encryptWithRsa(message: string): string {
+        if (!this.privateKey) throw new Error('Server private key not set.');
+        return privateEncrypt(
+            {
+                key: this.privateKey,
+                padding: constants.RSA_PKCS1_PADDING,
+            },
+            Buffer.from(message)
+        ).toString('base64');
     }
 
     protected async scanNetworkLatency(): Promise<number> {
@@ -54,4 +144,41 @@ export abstract class SocketCommunicatorBase {
 
         return chunkSize || 1024; // Fallback to 1024 if alignment adjustment results in 0
     }
+
+    async handleIncomingChunk(data: Buffer): Promise<void> {
+        const incomingData = data.toString().trim();
+
+        // Split the incoming data by <EOP> to handle multiple chunks concatenated by TCP
+        const messages = incomingData.split(this.EOP).filter(Boolean); // Filter out any empty strings from split
+
+        for (const incomingMessage of messages) {
+            const [headerJson, chunkContent] = incomingMessage.split('|');
+            const header = JSON.parse(headerJson);
+
+            // Initialize an array for chunks if it's the first chunk received for this messageId
+            if (!this.chunkBuffers[header.messageId]) {
+                this.chunkBuffers[header.messageId] = [];
+            }
+
+            // Directly set the chunk at the correct index, adjusting for 1-based indexing
+            this.chunkBuffers[header.messageId][header.sequenceNumber - 1] = chunkContent;
+
+            console.log(`Received chunk: ${incomingMessage}`);
+            console.log(`Chunks received so far: ${this.chunkBuffers[header.messageId].filter(chunk => chunk !== undefined).length}`);
+
+            // Check if all chunks have been received by confirming the length
+            if (this.chunkBuffers[header.messageId].filter(chunk => chunk !== undefined).length === header.totalChunks) {
+                const chunks = this.chunkBuffers[header.messageId];
+                const fullMessage = chunks.join('');
+
+                await this.handleIncomingMessage(fullMessage);
+
+                delete this.chunkBuffers[header.messageId];
+            }
+        }
+    }
+
+    abstract handleIncomingMessage(incomingMessage: string): Promise<void>;
+
+    abstract sendMessage(message: string): Promise<void>;
 }

UC/src/network/socket_communicator/tcp_server_communicator.ts

@@ -1,118 +1,48 @@
 import { Socket } from 'net';
-import { privateEncrypt, generateKeyPairSync, createCipheriv, createDecipheriv, randomBytes, constants } from 'crypto';
 import { MessageHandler } from '../message_handler';
 import { SocketCommunicatorBase } from './socket_communicator_base';
 import { OperationHandler } from '../operations_base/operation_handler';
 
 export class TcpServerCommunicator extends SocketCommunicatorBase {
     private readonly socket: Socket;
-    private privateKey: string | null;
-    private publicKey: string | null;
-    private aesKey: Buffer | null;
-    private aesIv: Buffer | null;
-    private chunkBuffers: { [messageId: string]: string[] };
 
     constructor(socket: Socket, ip: string, port: number, operationHandler: OperationHandler) {
         super(ip, port, operationHandler);
         this.socket = socket;
-        this.privateKey = null;
-        this.publicKey = null;  // Client public key will be set later
-        this.aesKey = null;
-        this.aesIv = null;
-        this.chunkBuffers = {};
-        this.generateKeyPair();
-    }
-
-    generateKeyPair(): void {
-        const { privateKey, publicKey } = generateKeyPairSync('rsa', {
-            modulusLength: 2048,
-            publicKeyEncoding: { type: 'spki', format: 'pem' },
-            privateKeyEncoding: { type: 'pkcs8', format: 'pem' },
-        });
-        this.privateKey = privateKey;
-        this.publicKey = publicKey;
     }
 
     async sendPublicKey(): Promise<void> {
-        if (!this.publicKey) {
+        this.generateKeyPair();
-            throw new Error('Public key is not available. Please generate RSA key pair.');
+        if (!this.publicKey || !this.privateKey) {
+            throw new Error('RSA key pair is not available. Please generate RSA key pair.');
         }
-        await this.sendChunkedMessage('SET_PUBLIC_KEY', { publicKey: this.publicKey });
+
+        await this.sendMessage('SET_PUBLIC_KEY', { publicKey: this.publicKey });
     }
 
     async sendAesKey(): Promise<void> {
-        this.aesKey = randomBytes(32);
+        this.generateAesKey();
-        this.aesIv = randomBytes(16);
+        if (!this.aesKey || !this.aesIv) {
+            throw new Error('AES key or IV is not available. Please generate AES key.');
+        }
+
         const aesKeyBase64 = this.aesKey.toString('base64');
         const aesIvBase64 = this.aesIv.toString('base64');
-        await this.sendChunkedMessage('SET_AES_KEY', { aesKey: aesKeyBase64, aesIv: aesIvBase64 });
+        await this.sendMessage('SET_AES_KEY', { aesKey: aesKeyBase64, aesIv: aesIvBase64 });
     }
 
-    private encryptWithRsa(message: string): string {
+    async handleIncomingMessage(incomingMessage: string): Promise<void> {
-        if (!this.privateKey) throw new Error('Server private key not set.');
+        const messageToProcess = this.decryptWithAes(incomingMessage);
-        return privateEncrypt(
+        this.handlerResult = await this.operationHandler.handleOperation(messageToProcess);
-            {
-                key: this.privateKey,
-                padding: constants.RSA_PKCS1_PADDING,
-            },
-            Buffer.from(message)
-        ).toString('base64');
     }
 
-    private decryptWithAes(encryptedMessage: string): string {
+    async sendMessage(operationCode: string, metaInfo?: { [key: string]: any }, fileContent?: Buffer): Promise<void> {
-        if (!this.aesKey || !this.aesIv) {
-            throw new Error('AES key not set.');
-        }
-        const decipher = createDecipheriv('aes-256-cbc', this.aesKey, this.aesIv);
-        let decrypted = decipher.update(Buffer.from(encryptedMessage, 'base64'));
-        decrypted = Buffer.concat([decrypted, decipher.final()]);
-        return decrypted.toString('utf-8');
-    }
-
-    private encryptWithAes(message: string): string {
-        if (!this.aesKey || !this.aesIv) {
-            throw new Error('AES key or IV is not set.');
-        }
-        const cipher = createCipheriv('aes-256-cbc', this.aesKey, this.aesIv);
-        let encrypted = cipher.update(message, 'utf-8');
-        encrypted = Buffer.concat([encrypted, cipher.final()]);
-        return encrypted.toString('base64');
-    }
-
-    async handleIncomingChunk(data: Buffer): Promise<void> {
-        const incomingMessage = data.toString().trim();
-        const [headerJson, chunkContent] = incomingMessage.split('|');
-        const header = JSON.parse(headerJson);
-        if (!this.chunkBuffers[header.messageId]) {
-            this.chunkBuffers[header.messageId] = new Array(header.totalChunks).fill(undefined);
-        }
-        this.chunkBuffers[header.messageId][header.sequenceNumber - 1] = chunkContent;
-        if (this.chunkBuffers[header.messageId].every((chunk) => chunk !== undefined)) {
-            await this.processCompleteMessage(header.messageId);
-        }
-    }
-
-    private async processCompleteMessage(messageId: string): Promise<void> {
-        const chunks = this.chunkBuffers[messageId];
-        if (chunks && chunks.every((chunk) => chunk !== undefined)) {
-            const fullMessage = chunks.join('');
-            await this.handleIncomingMessage(fullMessage);
-            delete this.chunkBuffers[messageId];
-        }
-    }
-
-    async sendChunkedMessage(
-        operationCode: string,
-        metaInfo?: { [key: string]: any },
-        fileContent?: Buffer
-    ): Promise<void> {
-        // Check if latency-based chunk size needs calculation
         if (!this.networkSpeed) {
             this.networkSpeed = await this.scanNetworkLatency();
         }
 
-        // Format the message for sending
         const message = MessageHandler.formatMessage(operationCode, metaInfo, fileContent);
+
         let outgoingMessage: string;
         switch (operationCode) {
             case 'SET_PUBLIC_KEY':
@@ -138,32 +68,8 @@ export class TcpServerCommunicator extends SocketCommunicatorBase {
                 sequenceNumber: i + 1,
                 totalChunks,
             });
-            const chunkWithHeader = `${chunkHeader}|${chunk}`;
+            const chunkWithHeader = `${chunkHeader}|${chunk}${this.EOP}`;
-            await this.writeToSocket(chunkWithHeader);
+            if(!this.socket.write(chunkWithHeader)) this.socket.end();
-
-            // Set delay based on latency for smoother transmission
-            const delay = Math.max(100, Math.min(300, this.networkSpeed * 10));
-            await new Promise((resolve) => setTimeout(resolve, delay));
         }
     }
-
-    async handleIncomingMessage(incomingMessage: string): Promise<void> {
-        let messageToProcess = incomingMessage;
-        if (this.aesKey && this.aesIv) {
-            messageToProcess = this.decryptWithAes(incomingMessage);
-        }
-        this.handlerResult = await this.operationHandler.handleOperation(messageToProcess);
-    }
-
-    protected writeToSocket(message: string): Promise<void> {
-        return new Promise((resolve, reject) => {
-            this.socket.write(message, (err: any) => {
-                if (err) {
-                    console.error('Error sending message over TCP:', err);
-                    return reject(err);
-                }
-                resolve();
-            });
-        });
-    }
 }

UC/src/network/socket_communicator/udp_socket_communicator.ts

@@ -11,20 +11,9 @@ export class UdpSocketCommunicator extends SocketCommunicatorBase {
         this.socket = socket;
     }
 
-    // Handle incoming message (no decryption needed for UDP)
-    handleIncomingMessage(incomingMessage: string): void {
-        this.handlerResult = this.operationHandler.handleOperation(incomingMessage);
-    }
-
     // Send plain message over UDP (metaInfo as JSON and fileContent as Buffer)
-    async sendMessage(operationCode: string, metaInfo?: any, fileContent?: Buffer): Promise<void> {
+    async sendMessage(operationCode: string, metaInfo?: { [key: string]: any }, fileContent?: Buffer): Promise<void> {
         const message = MessageHandler.formatMessage(operationCode, metaInfo, fileContent);
-
-        await this.sendUdpMessage(message);
-    }
-
-    // Helper method to wrap socket.send in a Promise for async/await support
-    private sendUdpMessage(message: string): Promise<void> {
         return new Promise((resolve, reject) => {
             this.socket.send(message, this.port, this.ip, (err: any) => {
                 if (err) {
@@ -36,4 +25,9 @@ export class UdpSocketCommunicator extends SocketCommunicatorBase {
             });
         });
     }
+
+    // Handle incoming message (no decryption needed for UDP)
+    async handleIncomingMessage(incomingMessage: string): Promise<void> {
+        this.handlerResult = await this.operationHandler.handleOperation(incomingMessage);
+    }
 }

UC/src/tcp_server.ts

@@ -58,7 +58,6 @@ export class TcpServer {
             const tcpCommunicator = new TcpServerCommunicator(socket, ip, port, this.operationHandler);
             this.connectionManager.addConnection(ip, port, tcpCommunicator);
 
-            tcpCommunicator.generateKeyPair();
             tcpCommunicator.sendPublicKey()
                 .then(() => tcpCommunicator.sendAesKey())
                 .then(() => this.log('Public key and AES key sent successfully.'))
@@ -106,7 +105,7 @@ export class TcpServer {
         const handlerResult = communicator.getHandlerResult();
         if (handlerResult) {
             try {
-                await communicator.sendChunkedMessage(
+                await communicator.sendMessage(
                     handlerResult.operationCode,
                     handlerResult.metaInfo,
                     handlerResult.fileContent

User/src/network/socket_communicator/socket_communicator_base.ts

@@ -1,24 +1,114 @@
 import { ParsedMessage } from '../message_handler';
 import { OperationHandler } from '../operations_base/operation_handler';
 import ping from "ping";
+import {
+    constants,
+    createCipheriv,
+    createDecipheriv,
+    generateKeyPairSync,
+    privateEncrypt,
+    publicDecrypt,
+    randomBytes
+} from "crypto";
 
 export abstract class SocketCommunicatorBase {
     protected readonly ip: string;
     protected readonly port: number;
     protected readonly operationHandler: OperationHandler;
     protected handlerResult: ParsedMessage | null;
-    protected networkSpeed: number | null = null;  // Estimated network speed in bytes/ms
+    protected networkSpeed: number | null = null;
+
+    protected chunkBuffers: { [messageId: string]: string[] };
+    protected readonly EOP = '<EOP>';
+
+    protected privateKey: string | null;
+    protected publicKey: string | null;
+    protected aesKey: Buffer | null;
+    protected aesIv: Buffer | null;
 
     protected constructor(ip: string, port: number, operationHandler: OperationHandler) {
         this.ip = ip;
         this.port = port;
         this.operationHandler = operationHandler
         this.handlerResult = null;
+        this.chunkBuffers = {};
+
+        this.privateKey = null;
+        this.publicKey = null;
+        this.aesKey = null;
+        this.aesIv = null;
     }
 
     // Getter for the handler result
     getHandlerResult(): ParsedMessage | null {
-        return this.handlerResult;
+        const result = this.handlerResult;
+        this.handlerResult = null;
+        return result;
+    }
+
+    protected generateKeyPair(): void {
+        const { privateKey, publicKey } = generateKeyPairSync('rsa', {
+            modulusLength: 2048,
+            publicKeyEncoding: { type: 'spki', format: 'pem' },
+            privateKeyEncoding: { type: 'pkcs8', format: 'pem' },
+        });
+        this.privateKey = privateKey;
+        this.publicKey = publicKey;
+    }
+
+    protected generateAesKey(): void {
+        this.aesKey = randomBytes(32);
+        this.aesIv = randomBytes(16);
+    }
+
+    protected encryptWithAes(message: string): string {
+        if (!this.aesKey || !this.aesIv) {
+            throw new Error('AES key or IV is not set.');
+        }
+        const cipher = createCipheriv('aes-256-cbc', this.aesKey, this.aesIv);
+        let encrypted = cipher.update(message, 'utf-8');
+        encrypted = Buffer.concat([encrypted, cipher.final()]);
+        return encrypted.toString('base64');
+    }
+
+    protected decryptWithAes(encryptedMessage: string): string {
+        if (!this.aesKey || !this.aesIv) {
+            throw new Error('AES key or IV is not set.');
+        }
+        const decipher = createDecipheriv('aes-256-cbc', this.aesKey, this.aesIv);
+        let decrypted = decipher.update(Buffer.from(encryptedMessage, 'base64'));
+        decrypted = Buffer.concat([decrypted, decipher.final()]);
+        return decrypted.toString('utf-8');
+    }
+
+    protected decryptWithRsa(message: string): string {
+        if (!this.publicKey) {
+            throw new Error('Server public key not set.');
+        }
+        try {
+            const encryptedMessage = Buffer.from(message, 'base64');
+            const decrypted = publicDecrypt(
+                {
+                    key: this.publicKey,
+                    padding: constants.RSA_PKCS1_PADDING,
+                },
+                encryptedMessage
+            );
+            return decrypted.toString('utf-8');
+        } catch (error) {
+            throw new Error('Failed to decrypt RSA message.');
+        }
+    }
+
+    protected encryptWithRsa(message: string): string {
+        if (!this.privateKey) throw new Error('Server private key not set.');
+        return privateEncrypt(
+            {
+                key: this.privateKey,
+                padding: constants.RSA_PKCS1_PADDING,
+            },
+            Buffer.from(message)
+        ).toString('base64');
     }
 
     protected async scanNetworkLatency(): Promise<number> {
@@ -54,4 +144,41 @@ export abstract class SocketCommunicatorBase {
 
         return chunkSize || 1024; // Fallback to 1024 if alignment adjustment results in 0
     }
+
+    async handleIncomingChunk(data: Buffer): Promise<void> {
+        const incomingData = data.toString().trim();
+
+        // Split the incoming data by <EOP> to handle multiple chunks concatenated by TCP
+        const messages = incomingData.split(this.EOP).filter(Boolean); // Filter out any empty strings from split
+
+        for (const incomingMessage of messages) {
+            const [headerJson, chunkContent] = incomingMessage.split('|');
+            const header = JSON.parse(headerJson);
+
+            // Initialize an array for chunks if it's the first chunk received for this messageId
+            if (!this.chunkBuffers[header.messageId]) {
+                this.chunkBuffers[header.messageId] = [];
+            }
+
+            // Directly set the chunk at the correct index, adjusting for 1-based indexing
+            this.chunkBuffers[header.messageId][header.sequenceNumber - 1] = chunkContent;
+
+            console.log(`Received chunk: ${incomingMessage}`);
+            console.log(`Chunks received so far: ${this.chunkBuffers[header.messageId].filter(chunk => chunk !== undefined).length}`);
+
+            // Check if all chunks have been received by confirming the length
+            if (this.chunkBuffers[header.messageId].filter(chunk => chunk !== undefined).length === header.totalChunks) {
+                const chunks = this.chunkBuffers[header.messageId];
+                const fullMessage = chunks.join('');
+
+                await this.handleIncomingMessage(fullMessage);
+
+                delete this.chunkBuffers[header.messageId];
+            }
+        }
+    }
+
+    abstract handleIncomingMessage(incomingMessage: string): Promise<void>;
+
+    abstract sendMessage(message: string): Promise<void>;
 }

User/src/network/socket_communicator/tcp_client_communicator.ts

@@ -1,30 +1,28 @@
 import { Socket } from 'net';
-import { createCipheriv, createDecipheriv, constants, publicDecrypt } from 'crypto';
-import { MessageHandler, ParsedMessage } from '../message_handler';
 import { SocketCommunicatorBase } from './socket_communicator_base';
 import { OperationHandler } from '../operations_base/operation_handler';
 import { operationCodes } from '../operation_codes';
+import {MessageHandler} from "../message_handler";
 
 export class TcpClientCommunicator extends SocketCommunicatorBase {
     private readonly socket: Socket;
-    private aesKey: Buffer | null;
-    private aesIv: Buffer | null;
-    private serverPublicKey: string | null;
     private isAesKeySetFlag: boolean;
-    private chunkBuffers: { [messageId: string]: string[] };
 
     constructor(socket: Socket, ip: string, port: number, operationHandler: OperationHandler) {
         super(ip, port, operationHandler);
         this.socket = socket;
         this.aesKey = null;
         this.aesIv = null;
-        this.serverPublicKey = null;
         this.isAesKeySetFlag = false;
         this.chunkBuffers = {};
     }
 
+    isAesKeySet(): boolean {
+        return this.isAesKeySetFlag;
+    }
+
     setServerPublicKey(publicKey: string): void {
-        this.serverPublicKey = publicKey;
+        this.publicKey = publicKey;
     }
 
     setAesKey(aesKey: string, aesIv: string): void {
@@ -32,115 +30,11 @@ export class TcpClientCommunicator extends SocketCommunicatorBase {
         this.aesIv = Buffer.from(aesIv, 'base64');
     }
 
-    private encryptWithAes(message: string): string {
-        if (!this.aesKey || !this.aesIv) {
-            throw new Error('AES key or IV is not set.');
-        }
-        const cipher = createCipheriv('aes-256-cbc', this.aesKey, this.aesIv);
-        let encrypted = cipher.update(message, 'utf-8');
-        encrypted = Buffer.concat([encrypted, cipher.final()]);
-        return encrypted.toString('base64');
-    }
-
-    private decryptWithAes(encryptedMessage: string): string {
-        if (!this.aesKey || !this.aesIv) {
-            throw new Error('AES key or IV is not set.');
-        }
-        const decipher = createDecipheriv('aes-256-cbc', this.aesKey, this.aesIv);
-        let decrypted = decipher.update(Buffer.from(encryptedMessage, 'base64'));
-        decrypted = Buffer.concat([decrypted, decipher.final()]);
-        return decrypted.toString('utf-8');
-    }
-
-    private decryptWithRsa(message: string): string {
-        if (!this.serverPublicKey) {
-            throw new Error('Server public key not set.');
-        }
-        try {
-            const encryptedMessage = Buffer.from(message, 'base64');
-            const decrypted = publicDecrypt(
-                {
-                    key: this.serverPublicKey,
-                    padding: constants.RSA_PKCS1_PADDING,
-                },
-                encryptedMessage
-            );
-            return decrypted.toString('utf-8');
-        } catch (error) {
-            throw new Error('Failed to decrypt RSA message.');
-        }
-    }
-
-    async sendChunkedMessage(operationCode: string, metaInfo?: { [key: string]: any }, fileContent?: Buffer): Promise<void> {
-        if (!this.networkSpeed) {
-            this.networkSpeed = await this.scanNetworkLatency();
-        }
-
-        const message = MessageHandler.formatMessage(operationCode, metaInfo, fileContent);
-        const outgoingMessage = this.encryptWithAes(message);
-
-        // Calculate optimal chunk size based on network latency
-        const optimalChunkSize = await this.calculateOptimalChunkSize(outgoingMessage.length);
-        const totalChunks = Math.ceil(outgoingMessage.length / optimalChunkSize);
-        const messageId = Date.now().toString();
-
-        // Send each chunk with a delay between them
-        for (let i = 0; i < totalChunks; i++) {
-            const chunk = outgoingMessage.slice(i * optimalChunkSize, (i + 1) * optimalChunkSize);
-            const chunkHeader = JSON.stringify({
-                messageId,
-                sequenceNumber: i + 1,
-                totalChunks,
-            });
-            const chunkWithHeader = `${chunkHeader}|${chunk}`;
-            await this.writeToSocket(chunkWithHeader);
-
-            // Set delay based on latency for smoother transmission
-            const delay = Math.max(100, Math.min(300, this.networkSpeed * 10));
-            await new Promise((resolve) => setTimeout(resolve, delay));
-        }
-    }
-
-    private writeToSocket(message: string): Promise<void> {
-        return new Promise((resolve, reject) => {
-            this.socket.write(message, (err: any) => {
-                if (err) {
-                    return reject(err);
-                }
-                resolve();
-            });
-        });
-    }
-
-    async handleIncomingChunk(data: Buffer): Promise<void> {
-        const incomingMessage = data.toString().trim();
-        const [headerJson, chunkContent] = incomingMessage.split('|');
-        const header = JSON.parse(headerJson);
-
-        if (!this.chunkBuffers[header.messageId]) {
-            this.chunkBuffers[header.messageId] = new Array(header.totalChunks).fill(undefined);
-        }
-
-        this.chunkBuffers[header.messageId][header.sequenceNumber - 1] = chunkContent;
-        if (this.chunkBuffers[header.messageId].every((chunk) => chunk !== undefined)) {
-            await this.processCompleteMessage(header.messageId);
-        }
-    }
-
-    private async processCompleteMessage(messageId: string): Promise<void> {
-        const chunks = this.chunkBuffers[messageId];
-        if (chunks && chunks.every((chunk) => chunk !== undefined)) {
-            const fullMessage = chunks.join('');
-            await this.handleIncomingMessage(fullMessage);
-            delete this.chunkBuffers[messageId];
-        }
-    }
-
     async handleIncomingMessage(incomingMessage: string): Promise<void> {
         let messageToProcess;
         if (this.aesKey && this.aesIv) {
             messageToProcess = this.decryptWithAes(incomingMessage);
-        } else if (this.serverPublicKey) {
+        } else if (this.publicKey) {
             messageToProcess = this.decryptWithRsa(incomingMessage);
         } else {
             messageToProcess = Buffer.from(incomingMessage, 'base64').toString('utf-8');
@@ -162,13 +56,31 @@ export class TcpClientCommunicator extends SocketCommunicatorBase {
         this.handlerResult = result;
     }
 
-    isAesKeySet(): boolean {
+    async sendMessage(operationCode: string, metaInfo?: { [key: string]: any }, fileContent?: Buffer): Promise<void> {
-        return this.isAesKeySetFlag;
+        if (!this.networkSpeed) {
+            this.networkSpeed = await this.scanNetworkLatency();
         }
 
-    getHandlerResult(): ParsedMessage | null {
+        const message = MessageHandler.formatMessage(operationCode, metaInfo, fileContent);
-        const message = this.handlerResult;
+
-        this.handlerResult = null;
+        const outgoingMessage = this.encryptWithAes(message);
-        return message;
+
+        // Calculate optimal chunk size based on network latency
+        const optimalChunkSize = await this.calculateOptimalChunkSize(outgoingMessage.length);
+        const totalChunks = Math.ceil(outgoingMessage.length / optimalChunkSize);
+        const messageId = Date.now().toString();
+
+        // Send each chunk with a delay between them
+        for (let i = 0; i < totalChunks; i++) {
+            const chunk = outgoingMessage.slice(i * optimalChunkSize, (i + 1) * optimalChunkSize);
+            const chunkHeader = JSON.stringify({
+                messageId,
+                sequenceNumber: i + 1,
+                totalChunks,
+            });
+            const chunkWithHeader = `${chunkHeader}|${chunk}${this.EOP}`;
+            if(!this.socket.write(chunkWithHeader)) this.socket.end();
         }
     }
+
+}

User/src/network/socket_communicator/tcp_server_communicator.ts

@@ -1,118 +1,48 @@
 import { Socket } from 'net';
-import { privateEncrypt, generateKeyPairSync, createCipheriv, createDecipheriv, randomBytes, constants } from 'crypto';
 import { MessageHandler } from '../message_handler';
 import { SocketCommunicatorBase } from './socket_communicator_base';
 import { OperationHandler } from '../operations_base/operation_handler';
 
 export class TcpServerCommunicator extends SocketCommunicatorBase {
     private readonly socket: Socket;
-    private privateKey: string | null;
-    private publicKey: string | null;
-    private aesKey: Buffer | null;
-    private aesIv: Buffer | null;
-    private chunkBuffers: { [messageId: string]: string[] };
 
     constructor(socket: Socket, ip: string, port: number, operationHandler: OperationHandler) {
         super(ip, port, operationHandler);
         this.socket = socket;
-        this.privateKey = null;
-        this.publicKey = null;  // Client public key will be set later
-        this.aesKey = null;
-        this.aesIv = null;
-        this.chunkBuffers = {};
-        this.generateKeyPair();
-    }
-
-    generateKeyPair(): void {
-        const { privateKey, publicKey } = generateKeyPairSync('rsa', {
-            modulusLength: 2048,
-            publicKeyEncoding: { type: 'spki', format: 'pem' },
-            privateKeyEncoding: { type: 'pkcs8', format: 'pem' },
-        });
-        this.privateKey = privateKey;
-        this.publicKey = publicKey;
     }
 
     async sendPublicKey(): Promise<void> {
-        if (!this.publicKey) {
+        this.generateKeyPair();
-            throw new Error('Public key is not available. Please generate RSA key pair.');
+        if (!this.publicKey || !this.privateKey) {
+            throw new Error('RSA key pair is not available. Please generate RSA key pair.');
         }
-        await this.sendChunkedMessage('SET_PUBLIC_KEY', { publicKey: this.publicKey });
+
+        await this.sendMessage('SET_PUBLIC_KEY', { publicKey: this.publicKey });
     }
 
     async sendAesKey(): Promise<void> {
-        this.aesKey = randomBytes(32);
+        this.generateAesKey();
-        this.aesIv = randomBytes(16);
+        if (!this.aesKey || !this.aesIv) {
+            throw new Error('AES key or IV is not available. Please generate AES key.');
+        }
+
         const aesKeyBase64 = this.aesKey.toString('base64');
         const aesIvBase64 = this.aesIv.toString('base64');
-        await this.sendChunkedMessage('SET_AES_KEY', { aesKey: aesKeyBase64, aesIv: aesIvBase64 });
+        await this.sendMessage('SET_AES_KEY', { aesKey: aesKeyBase64, aesIv: aesIvBase64 });
     }
 
-    private encryptWithRsa(message: string): string {
+    async handleIncomingMessage(incomingMessage: string): Promise<void> {
-        if (!this.privateKey) throw new Error('Server private key not set.');
+        const messageToProcess = this.decryptWithAes(incomingMessage);
-        return privateEncrypt(
+        this.handlerResult = await this.operationHandler.handleOperation(messageToProcess);
-            {
-                key: this.privateKey,
-                padding: constants.RSA_PKCS1_PADDING,
-            },
-            Buffer.from(message)
-        ).toString('base64');
     }
 
-    private decryptWithAes(encryptedMessage: string): string {
+    async sendMessage(operationCode: string, metaInfo?: { [key: string]: any }, fileContent?: Buffer): Promise<void> {
-        if (!this.aesKey || !this.aesIv) {
-            throw new Error('AES key not set.');
-        }
-        const decipher = createDecipheriv('aes-256-cbc', this.aesKey, this.aesIv);
-        let decrypted = decipher.update(Buffer.from(encryptedMessage, 'base64'));
-        decrypted = Buffer.concat([decrypted, decipher.final()]);
-        return decrypted.toString('utf-8');
-    }
-
-    private encryptWithAes(message: string): string {
-        if (!this.aesKey || !this.aesIv) {
-            throw new Error('AES key or IV is not set.');
-        }
-        const cipher = createCipheriv('aes-256-cbc', this.aesKey, this.aesIv);
-        let encrypted = cipher.update(message, 'utf-8');
-        encrypted = Buffer.concat([encrypted, cipher.final()]);
-        return encrypted.toString('base64');
-    }
-
-    async handleIncomingChunk(data: Buffer): Promise<void> {
-        const incomingMessage = data.toString().trim();
-        const [headerJson, chunkContent] = incomingMessage.split('|');
-        const header = JSON.parse(headerJson);
-        if (!this.chunkBuffers[header.messageId]) {
-            this.chunkBuffers[header.messageId] = new Array(header.totalChunks).fill(undefined);
-        }
-        this.chunkBuffers[header.messageId][header.sequenceNumber - 1] = chunkContent;
-        if (this.chunkBuffers[header.messageId].every((chunk) => chunk !== undefined)) {
-            await this.processCompleteMessage(header.messageId);
-        }
-    }
-
-    private async processCompleteMessage(messageId: string): Promise<void> {
-        const chunks = this.chunkBuffers[messageId];
-        if (chunks && chunks.every((chunk) => chunk !== undefined)) {
-            const fullMessage = chunks.join('');
-            await this.handleIncomingMessage(fullMessage);
-            delete this.chunkBuffers[messageId];
-        }
-    }
-
-    async sendChunkedMessage(
-        operationCode: string,
-        metaInfo?: { [key: string]: any },
-        fileContent?: Buffer
-    ): Promise<void> {
-        // Check if latency-based chunk size needs calculation
         if (!this.networkSpeed) {
             this.networkSpeed = await this.scanNetworkLatency();
         }
 
-        // Format the message for sending
         const message = MessageHandler.formatMessage(operationCode, metaInfo, fileContent);
+
         let outgoingMessage: string;
         switch (operationCode) {
             case 'SET_PUBLIC_KEY':
@@ -138,32 +68,8 @@ export class TcpServerCommunicator extends SocketCommunicatorBase {
                 sequenceNumber: i + 1,
                 totalChunks,
             });
-            const chunkWithHeader = `${chunkHeader}|${chunk}`;
+            const chunkWithHeader = `${chunkHeader}|${chunk}${this.EOP}`;
-            await this.writeToSocket(chunkWithHeader);
+            if(!this.socket.write(chunkWithHeader)) this.socket.end();
-
-            // Set delay based on latency for smoother transmission
-            const delay = Math.max(100, Math.min(300, this.networkSpeed * 10));
-            await new Promise((resolve) => setTimeout(resolve, delay));
         }
     }
-
-    async handleIncomingMessage(incomingMessage: string): Promise<void> {
-        let messageToProcess = incomingMessage;
-        if (this.aesKey && this.aesIv) {
-            messageToProcess = this.decryptWithAes(incomingMessage);
-        }
-        this.handlerResult = await this.operationHandler.handleOperation(messageToProcess);
-    }
-
-    protected writeToSocket(message: string): Promise<void> {
-        return new Promise((resolve, reject) => {
-            this.socket.write(message, (err: any) => {
-                if (err) {
-                    console.error('Error sending message over TCP:', err);
-                    return reject(err);
-                }
-                resolve();
-            });
-        });
-    }
 }

User/src/network/socket_communicator/udp_socket_communicator.ts

@@ -11,20 +11,9 @@ export class UdpSocketCommunicator extends SocketCommunicatorBase {
         this.socket = socket;
     }
 
-    // Handle incoming message (no decryption needed for UDP)
-    async handleIncomingMessage(incomingMessage: string): Promise<void> {
-        this.handlerResult = await this.operationHandler.handleOperation(incomingMessage);
-    }
-
     // Send plain message over UDP (metaInfo as JSON and fileContent as Buffer)
     async sendMessage(operationCode: string, metaInfo?: { [key: string]: any }, fileContent?: Buffer): Promise<void> {
         const message = MessageHandler.formatMessage(operationCode, metaInfo, fileContent);
-
-        await this.sendUdpMessage(message);
-    }
-
-    // Helper method to wrap socket.send in a Promise for async/await support
-    private sendUdpMessage(message: string): Promise<void> {
         return new Promise((resolve, reject) => {
             this.socket.send(message, this.port, this.ip, (err: any) => {
                 if (err) {
@@ -36,4 +25,9 @@ export class UdpSocketCommunicator extends SocketCommunicatorBase {
             });
         });
     }
+
+    // Handle incoming message (no decryption needed for UDP)
+    async handleIncomingMessage(incomingMessage: string): Promise<void> {
+        this.handlerResult = await this.operationHandler.handleOperation(incomingMessage);
+    }
 }

User/src/network/tcp/tcp_client.ts

@@ -80,7 +80,7 @@ export class TcpClient {
         }
 
         this.log(`Sending message with operationCode: ${operationCode}`);
-        await this.communicator.sendChunkedMessage(operationCode, metaInfo, fileContent);
+        await this.communicator.sendMessage(operationCode, metaInfo, fileContent);
         return true;
     }
 

User/src/network/tcp/tcp_server.ts

@@ -43,7 +43,6 @@ export class TcpServer {
 
             const tcpCommunicator = new TcpServerCommunicator(socket, ip, port, this.operationHandler);
             this.connectionManager.addConnection(ip, port, tcpCommunicator);
-            tcpCommunicator.generateKeyPair();
 
             tcpCommunicator.sendPublicKey()
                 .then(() => tcpCommunicator.sendAesKey())
@@ -106,7 +105,7 @@ export class TcpServer {
         const handlerResult = communicator.getHandlerResult();
         if (handlerResult) {
             try {
-                await communicator.sendChunkedMessage(
+                await communicator.sendMessage(
                     handlerResult.operationCode,
                     handlerResult.metaInfo,
                     handlerResult.fileContent