@push.rocks/smartproxy
Version:
A powerful proxy package with unified route-based configuration for high traffic management. Features include SSL/TLS support, flexible routing patterns, WebSocket handling, advanced security options, and automatic ACME certificate management.
257 lines • 23.1 kB
JavaScript
import * as plugins from '../../plugins.js';
import '../../core/models/socket-augmentation.js';
import { TemplateUtils } from '../../core/utils/template-utils.js';
/**
* HTTP Request Handler Helper - handles requests with specific destinations
* This is a helper class for the main RequestHandler
*/
export class HttpRequestHandler {
/**
* Handle HTTP request with a specific destination
*/
static async handleHttpRequestWithDestination(req, res, destination, routeContext, startTime, logger, metricsTracker, route) {
try {
// Apply URL rewriting if route config is provided
if (route) {
HttpRequestHandler.applyUrlRewriting(req, route, routeContext, logger);
HttpRequestHandler.applyRouteHeaderModifications(route, req, res, logger);
}
// Create options for the proxy request
const options = {
hostname: destination.host,
port: destination.port,
path: req.url,
method: req.method,
headers: { ...req.headers }
};
// Optionally rewrite host header to match target
if (options.headers && 'host' in options.headers) {
// Only apply if host header rewrite is enabled or not explicitly disabled
const shouldRewriteHost = route?.action.options?.rewriteHostHeader !== false;
if (shouldRewriteHost) {
// Safely cast to OutgoingHttpHeaders to access host property
options.headers.host = `${destination.host}:${destination.port}`;
}
}
logger.debug(`Proxying request to ${destination.host}:${destination.port}${req.url}`, { method: req.method });
// Create proxy request
const proxyReq = plugins.http.request(options, (proxyRes) => {
// Copy status code
res.statusCode = proxyRes.statusCode || 500;
// Copy headers from proxy response to client response
for (const [key, value] of Object.entries(proxyRes.headers)) {
if (value !== undefined) {
res.setHeader(key, value);
}
}
// Apply response header modifications if route config is provided
if (route && route.headers?.response) {
HttpRequestHandler.applyResponseHeaderModifications(route, res, logger, routeContext);
}
// Pipe proxy response to client response
proxyRes.pipe(res);
// Increment served requests counter when the response finishes
res.on('finish', () => {
if (metricsTracker) {
metricsTracker.incrementRequestsServed();
}
// Log the completed request
const duration = Date.now() - startTime;
logger.debug(`Request completed in ${duration}ms: ${req.method} ${req.url} ${res.statusCode}`, { duration, statusCode: res.statusCode });
});
});
// Handle proxy request errors
proxyReq.on('error', (error) => {
const duration = Date.now() - startTime;
logger.error(`Proxy error for ${req.method} ${req.url}: ${error.message}`, { duration, error: error.message });
// Increment failed requests counter
if (metricsTracker) {
metricsTracker.incrementFailedRequests();
}
// Check if headers have already been sent
if (!res.headersSent) {
res.statusCode = 502;
res.end(`Bad Gateway: ${error.message}`);
}
else {
// If headers already sent, just close the connection
res.end();
}
});
// Pipe request body to proxy request and handle client-side errors
req.pipe(proxyReq);
// Handle client disconnection
req.on('error', (error) => {
logger.debug(`Client connection error: ${error.message}`);
proxyReq.destroy();
// Increment failed requests counter on client errors
if (metricsTracker) {
metricsTracker.incrementFailedRequests();
}
});
// Handle response errors
res.on('error', (error) => {
logger.debug(`Response error: ${error.message}`);
proxyReq.destroy();
// Increment failed requests counter on response errors
if (metricsTracker) {
metricsTracker.incrementFailedRequests();
}
});
}
catch (error) {
// Handle any unexpected errors
logger.error(`Unexpected error handling request: ${error.message}`, { error: error.stack });
// Increment failed requests counter
if (metricsTracker) {
metricsTracker.incrementFailedRequests();
}
if (!res.headersSent) {
res.statusCode = 500;
res.end('Internal Server Error');
}
else {
res.end();
}
}
}
/**
* Apply URL rewriting based on route configuration
* Implements Phase 5.2: URL rewriting using route context
*
* @param req The request with the URL to rewrite
* @param route The route configuration containing rewrite rules
* @param routeContext Context for template variable resolution
* @param logger Logger for debugging information
* @returns True if URL was rewritten, false otherwise
*/
static applyUrlRewriting(req, route, routeContext, logger) {
// Check if route has URL rewriting configuration
if (!route.action.advanced?.urlRewrite) {
return false;
}
const rewriteConfig = route.action.advanced.urlRewrite;
// Store original URL for logging
const originalUrl = req.url;
if (rewriteConfig.pattern && rewriteConfig.target) {
try {
// Create a RegExp from the pattern with optional flags
const regex = new RegExp(rewriteConfig.pattern, rewriteConfig.flags || '');
// Apply rewriting with template variable resolution
let target = rewriteConfig.target;
// Replace template variables in target with values from context
target = TemplateUtils.resolveTemplateVariables(target, routeContext);
// If onlyRewritePath is set, split URL into path and query parts
if (rewriteConfig.onlyRewritePath && req.url) {
const [path, query] = req.url.split('?');
const rewrittenPath = path.replace(regex, target);
req.url = query ? `${rewrittenPath}?${query}` : rewrittenPath;
}
else {
// Perform the replacement on the entire URL
req.url = req.url?.replace(regex, target);
}
logger.debug(`URL rewritten: ${originalUrl} -> ${req.url}`);
return true;
}
catch (err) {
logger.error(`Error in URL rewriting: ${err}`);
return false;
}
}
return false;
}
/**
* Apply header modifications from route configuration to request headers
* Implements Phase 5.1: Route-based header manipulation for requests
*/
static applyRouteHeaderModifications(route, req, res, logger) {
// Check if route has header modifications
if (!route.headers) {
return;
}
// Apply request header modifications (these will be sent to the backend)
if (route.headers.request && req.headers) {
// Create routing context for template resolution
const routeContext = {
domain: req.headers.host || '',
path: req.url || '',
clientIp: req.socket.remoteAddress?.replace('::ffff:', '') || '',
serverIp: req.socket.localAddress?.replace('::ffff:', '') || '',
port: parseInt(req.socket.localPort?.toString() || '0', 10),
isTls: !!req.socket.encrypted,
headers: req.headers,
timestamp: Date.now(),
connectionId: `${Date.now()}-${Math.floor(Math.random() * 10000)}`,
};
for (const [key, value] of Object.entries(route.headers.request)) {
// Skip if header already exists and we're not overriding
if (req.headers[key.toLowerCase()] && !value.startsWith('!')) {
continue;
}
// Handle special delete directive (!delete)
if (value === '!delete') {
delete req.headers[key.toLowerCase()];
logger.debug(`Deleted request header: ${key}`);
continue;
}
// Handle forced override (!value)
let finalValue;
if (value.startsWith('!')) {
// Keep the ! but resolve any templates in the rest
const templateValue = value.substring(1);
finalValue = '!' + TemplateUtils.resolveTemplateVariables(templateValue, routeContext);
}
else {
// Resolve templates in the entire value
finalValue = TemplateUtils.resolveTemplateVariables(value, routeContext);
}
// Set the header
req.headers[key.toLowerCase()] = finalValue;
logger.debug(`Modified request header: ${key}=${finalValue}`);
}
}
}
/**
* Apply header modifications from route configuration to response headers
* Implements Phase 5.1: Route-based header manipulation for responses
*/
static applyResponseHeaderModifications(route, res, logger, routeContext) {
// Check if route has response header modifications
if (!route.headers?.response) {
return;
}
// Apply response header modifications
for (const [key, value] of Object.entries(route.headers.response)) {
// Skip if header already exists and we're not overriding
if (res.hasHeader(key) && !value.startsWith('!')) {
continue;
}
// Handle special delete directive (!delete)
if (value === '!delete') {
res.removeHeader(key);
logger.debug(`Deleted response header: ${key}`);
continue;
}
// Handle forced override (!value)
let finalValue;
if (value.startsWith('!') && value !== '!delete') {
// Keep the ! but resolve any templates in the rest
const templateValue = value.substring(1);
finalValue = routeContext
? '!' + TemplateUtils.resolveTemplateVariables(templateValue, routeContext)
: '!' + templateValue;
}
else {
// Resolve templates in the entire value
finalValue = routeContext
? TemplateUtils.resolveTemplateVariables(value, routeContext)
: value;
}
// Set the header
res.setHeader(key, finalValue);
logger.debug(`Modified response header: ${key}=${finalValue}`);
}
}
}
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