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WebServer.cpp
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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright 2016-2026 Hristo Gochkov, Mathieu Carbou, Emil Muratov, Will Miles
#include "ESPAsyncWebServer.h"
#include "WebHandlerImpl.h"
#include <string>
#include <utility>
#if defined(ESP32) || defined(TARGET_RP2040) || defined(TARGET_RP2350) || defined(PICO_RP2040) || defined(PICO_RP2350) || defined(LIBRETINY)
#include <WiFi.h>
#elif defined(ESP8266)
#include <ESP8266WiFi.h>
#else
#error Platform not supported
#endif
using namespace asyncsrv;
bool ON_STA_FILTER(AsyncWebServerRequest *request) {
#if ASYNCWEBSERVER_WIFI_SUPPORTED
return WiFi.localIP() == request->client()->localIP();
#else
return false;
#endif
}
bool ON_AP_FILTER(AsyncWebServerRequest *request) {
#if ASYNCWEBSERVER_WIFI_SUPPORTED
return WiFi.localIP() != request->client()->localIP();
#else
return false;
#endif
}
#ifndef HAVE_FS_FILE_OPEN_MODE
const char *fs::FileOpenMode::read = "r";
const char *fs::FileOpenMode::write = "w";
const char *fs::FileOpenMode::append = "a";
#endif
AsyncWebServer::AsyncWebServer(uint16_t port) : _server(port) {
_catchAllHandler = new AsyncCallbackWebHandler();
_server.onClient(
[](void *s, AsyncClient *c) {
if (c == NULL) {
return;
}
c->setRxTimeout(3);
AsyncWebServerRequest *r = new AsyncWebServerRequest((AsyncWebServer *)s, c);
if (r == NULL) {
c->abort();
delete c;
}
},
this
);
}
AsyncWebServer::~AsyncWebServer() {
reset();
end();
delete _catchAllHandler;
_catchAllHandler = nullptr; // Prevent potential use-after-free
}
AsyncWebRewrite &AsyncWebServer::addRewrite(std::shared_ptr<AsyncWebRewrite> rewrite) {
_rewrites.emplace_back(rewrite);
return *_rewrites.back().get();
}
AsyncWebRewrite &AsyncWebServer::addRewrite(AsyncWebRewrite *rewrite) {
_rewrites.emplace_back(rewrite);
return *_rewrites.back().get();
}
bool AsyncWebServer::removeRewrite(AsyncWebRewrite *rewrite) {
return removeRewrite(rewrite->from().c_str(), rewrite->toUrl().c_str());
}
bool AsyncWebServer::removeRewrite(const char *from, const char *to) {
for (auto r = _rewrites.begin(); r != _rewrites.end(); ++r) {
if (r->get()->from() == from && r->get()->toUrl() == to) {
_rewrites.erase(r);
return true;
}
}
return false;
}
AsyncWebRewrite &AsyncWebServer::rewrite(const char *from, const char *to) {
_rewrites.emplace_back(std::make_shared<AsyncWebRewrite>(from, to));
return *_rewrites.back().get();
}
AsyncWebHandler &AsyncWebServer::addHandler(AsyncWebHandler *handler) {
_handlers.emplace_back(handler);
return *(_handlers.back().get());
}
bool AsyncWebServer::removeHandler(AsyncWebHandler *handler) {
for (auto i = _handlers.begin(); i != _handlers.end(); ++i) {
if (i->get() == handler) {
_handlers.erase(i);
return true;
}
}
return false;
}
void AsyncWebServer::begin() {
_server.setNoDelay(true);
_server.begin();
}
void AsyncWebServer::end() {
_server.end();
}
#if ASYNC_TCP_SSL_ENABLED
void AsyncWebServer::onSslFileRequest(AcSSlFileHandler cb, void *arg) {
_server.onSslFileRequest(cb, arg);
}
void AsyncWebServer::beginSecure(const char *cert, const char *key, const char *password) {
_server.beginSecure(cert, key, password);
}
#endif
void AsyncWebServer::_handleDisconnect(AsyncWebServerRequest *request) {
delete request;
}
void AsyncWebServer::_rewriteRequest(AsyncWebServerRequest *request) {
// the last rewrite that matches the request will be used
// we do not break the loop to allow for multiple rewrites to be applied and only the last one to be used (allows overriding)
for (const auto &r : _rewrites) {
if (r->match(request)) {
request->_url = r->toUrl();
request->_addGetParams(r->params());
}
}
}
void AsyncWebServer::_attachHandler(AsyncWebServerRequest *request) {
for (auto &h : _handlers) {
if (h->filter(request) && h->canHandle(request)) {
request->setHandler(h.get());
return;
}
}
// ESP_LOGD("AsyncWebServer", "No handler found for %s, using _catchAllHandler pointer: %p", request->url().c_str(), _catchAllHandler);
request->setHandler(_catchAllHandler);
}
AsyncCallbackWebHandler &AsyncWebServer::on(
AsyncURIMatcher uri, WebRequestMethodComposite method, ArRequestHandlerFunction onRequest, ArUploadHandlerFunction onUpload, ArBodyHandlerFunction onBody
) {
AsyncCallbackWebHandler *handler = new AsyncCallbackWebHandler();
handler->setUri(std::move(uri));
handler->setMethod(method);
handler->onRequest(onRequest);
handler->onUpload(onUpload);
handler->onBody(onBody);
addHandler(handler);
return *handler;
}
#if ASYNC_JSON_SUPPORT == 1
AsyncCallbackJsonWebHandler &AsyncWebServer::on(AsyncURIMatcher uri, WebRequestMethodComposite method, ArJsonRequestHandlerFunction onBody) {
AsyncCallbackJsonWebHandler *handler = new AsyncCallbackJsonWebHandler(std::move(uri), onBody);
handler->setMethod(method);
addHandler(handler);
return *handler;
}
#endif
AsyncStaticWebHandler &AsyncWebServer::serveStatic(const char *uri, fs::FS &fs, const char *path, const char *cache_control) {
AsyncStaticWebHandler *handler = new AsyncStaticWebHandler(uri, fs, path, cache_control);
addHandler(handler);
return *handler;
}
void AsyncWebServer::onNotFound(ArRequestHandlerFunction fn) {
_catchAllHandler->onRequest(fn);
}
void AsyncWebServer::onFileUpload(ArUploadHandlerFunction fn) {
_catchAllHandler->onUpload(fn);
}
void AsyncWebServer::onRequestBody(ArBodyHandlerFunction fn) {
_catchAllHandler->onBody(fn);
}
AsyncWebHandler &AsyncWebServer::catchAllHandler() const {
return *_catchAllHandler;
}
void AsyncWebServer::reset() {
_rewrites.clear();
_handlers.clear();
_catchAllHandler->onRequest(NULL);
_catchAllHandler->onUpload(NULL);
_catchAllHandler->onBody(NULL);
}
AsyncURIMatcher::AsyncURIMatcher(String uri, uint16_t modifiers) : _value(std::move(uri)) {
#ifdef ASYNCWEBSERVER_REGEX
if (_value.startsWith("^") && _value.endsWith("$")) {
pattern = new std::regex(_value.c_str(), (modifiers & CaseInsensitive) ? (std::regex::icase | std::regex::optimize) : (std::regex::optimize));
return; // no additional processing - flags are overwritten by pattern pointer
}
#endif
if (modifiers & CaseInsensitive) {
_value.toLowerCase();
}
// Inspect _value to set flags
// empty URI matches everything
if (!_value.length()) {
_flags = _toFlags(Type::All, modifiers);
} else if (_value.endsWith("*")) {
// wildcard match with * at the end
_flags = _toFlags(Type::Prefix, modifiers);
_value = _value.substring(0, _value.length() - 1);
} else if (_value.lastIndexOf("/*.") >= 0) {
// prefix match with /*.ext
// matches any path ending with .ext
// e.g. /images/*.png will match /images/pic.png and /images/2023/pic.png but not /img/pic.png
_flags = _toFlags(Type::Extension, modifiers);
} else {
// backward compatible use case: exact match or prefix with trailing /
_flags = _toFlags(Type::BackwardCompatible, modifiers);
}
}
AsyncURIMatcher::AsyncURIMatcher(String uri, Type type, uint16_t modifiers) : _value(std::move(uri)), _flags(_toFlags(type, modifiers)) {
#ifdef ASYNCWEBSERVER_REGEX
if (type == Type::Regex) {
pattern = new std::regex(_value.c_str(), (modifiers & CaseInsensitive) ? (std::regex::icase | std::regex::optimize) : (std::regex::optimize));
return; // no additional processing - flags are overwritten by pattern pointer
}
#endif
if (modifiers & CaseInsensitive) {
_value.toLowerCase();
}
}
#ifdef ASYNCWEBSERVER_REGEX
AsyncURIMatcher::AsyncURIMatcher(const AsyncURIMatcher &c) : _value(c._value), _flags(c._flags) {
if (_isRegex()) {
pattern = new std::regex(*pattern);
}
}
AsyncURIMatcher::AsyncURIMatcher(AsyncURIMatcher &&c) : _value(std::move(c._value)), _flags(c._flags) {
c._flags = _toFlags(Type::None, None);
}
AsyncURIMatcher::~AsyncURIMatcher() {
if (_isRegex()) {
delete pattern;
}
}
AsyncURIMatcher &AsyncURIMatcher::operator=(const AsyncURIMatcher &r) {
_value = r._value;
if (r._isRegex()) {
// Allocate first before we delete our current state
auto p = new std::regex(*r.pattern);
// Safely reassign our pattern
if (_isRegex()) {
delete pattern;
}
pattern = p;
} else {
if (_isRegex()) {
delete pattern;
}
_flags = r._flags;
}
return *this;
}
AsyncURIMatcher &AsyncURIMatcher::operator=(AsyncURIMatcher &&r) {
_value = std::move(r._value);
if (_isRegex()) {
delete pattern;
}
_flags = r._flags;
if (r._isRegex()) {
// We have adopted it
r._flags = _toFlags(Type::None, None);
}
return *this;
}
#endif
bool AsyncURIMatcher::matches(AsyncWebServerRequest *request) const {
#ifdef ASYNCWEBSERVER_REGEX
if (_isRegex()) {
// when type == Type::Regex, or when _value was auto-detected as regex
std::smatch matches;
std::string s(request->url().c_str());
if (std::regex_search(s, matches, *pattern)) {
for (size_t i = 1; i < matches.size(); ++i) {
request->_pathParams.emplace_back(matches[i].str().c_str());
}
return true;
}
return false;
}
#endif
// extract matcher type from _flags
Type type;
uint16_t modifiers;
std::tie(type, modifiers) = _fromFlags(_flags);
// apply modifiers
String path = request->url();
if (modifiers & CaseInsensitive) {
path.toLowerCase();
}
switch (type) {
case Type::All: return true;
case Type::None: return false;
case Type::Exact: return (_value == path);
case Type::Prefix: return path.startsWith(_value);
case Type::Extension:
{
int split = _value.lastIndexOf("/*.");
return (split >= 0 && path.startsWith(_value.substring(0, split)) && path.endsWith(_value.substring(split + 2)));
}
case Type::BackwardCompatible: return (_value == path) || path.startsWith(_value + "/");
default:
// Should never happen - programming error
assert("Invalid type");
return false;
}
}