Monitoring system for electric vehicles (log various sensors, such as consumed power, solar production, speed, slope, apparent wind, etc.)
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

221 lines
7.5 KiB

/*
Asynchronous WebServer library for Espressif MCUs
Copyright (c) 2016 Hristo Gochkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "ESPAsyncWebServer.h"
#include "WebHandlerImpl.h"
AsyncStaticWebHandler::AsyncStaticWebHandler(const char* uri, FS& fs, const char* path, const char* cache_control)
: _fs(fs), _uri(uri), _path(path), _default_file("index.htm"), _cache_control(cache_control), _last_modified(""), _callback(nullptr)
{
// Ensure leading '/'
if (_uri.length() == 0 || _uri[0] != '/') _uri = "/" + _uri;
if (_path.length() == 0 || _path[0] != '/') _path = "/" + _path;
// If path ends with '/' we assume a hint that this is a directory to improve performance.
// However - if it does not end with '/' we, can't assume a file, path can still be a directory.
_isDir = _path[_path.length()-1] == '/';
// Remove the trailing '/' so we can handle default file
// Notice that root will be "" not "/"
if (_uri[_uri.length()-1] == '/') _uri = _uri.substring(0, _uri.length()-1);
if (_path[_path.length()-1] == '/') _path = _path.substring(0, _path.length()-1);
// Reset stats
_gzipFirst = false;
_gzipStats = 0xF8;
}
AsyncStaticWebHandler& AsyncStaticWebHandler::setIsDir(bool isDir){
_isDir = isDir;
return *this;
}
AsyncStaticWebHandler& AsyncStaticWebHandler::setDefaultFile(const char* filename){
_default_file = String(filename);
return *this;
}
AsyncStaticWebHandler& AsyncStaticWebHandler::setCacheControl(const char* cache_control){
_cache_control = String(cache_control);
return *this;
}
AsyncStaticWebHandler& AsyncStaticWebHandler::setLastModified(const char* last_modified){
_last_modified = String(last_modified);
return *this;
}
AsyncStaticWebHandler& AsyncStaticWebHandler::setLastModified(struct tm* last_modified){
char result[30];
strftime (result,30,"%a, %d %b %Y %H:%M:%S %Z", last_modified);
return setLastModified((const char *)result);
}
#ifdef ESP8266
AsyncStaticWebHandler& AsyncStaticWebHandler::setLastModified(time_t last_modified){
return setLastModified((struct tm *)gmtime(&last_modified));
}
AsyncStaticWebHandler& AsyncStaticWebHandler::setLastModified(){
time_t last_modified;
if(time(&last_modified) == 0) //time is not yet set
return *this;
return setLastModified(last_modified);
}
#endif
bool AsyncStaticWebHandler::canHandle(AsyncWebServerRequest *request){
if(request->method() != HTTP_GET
|| !request->url().startsWith(_uri)
|| !request->isExpectedRequestedConnType(RCT_DEFAULT, RCT_HTTP)
){
return false;
}
if (_getFile(request)) {
// We interested in "If-Modified-Since" header to check if file was modified
if (_last_modified.length())
request->addInterestingHeader("If-Modified-Since");
if(_cache_control.length())
request->addInterestingHeader("If-None-Match");
DEBUGF("[AsyncStaticWebHandler::canHandle] TRUE\n");
return true;
}
return false;
}
bool AsyncStaticWebHandler::_getFile(AsyncWebServerRequest *request)
{
// Remove the found uri
String path = request->url().substring(_uri.length());
// We can skip the file check and look for default if request is to the root of a directory or that request path ends with '/'
bool canSkipFileCheck = (_isDir && path.length() == 0) || (path.length() && path[path.length()-1] == '/');
path = _path + path;
// Do we have a file or .gz file
if (!canSkipFileCheck && _fileExists(request, path))
return true;
// Can't handle if not default file
if (_default_file.length() == 0)
return false;
// Try to add default file, ensure there is a trailing '/' ot the path.
if (path.length() == 0 || path[path.length()-1] != '/')
path += "/";
path += _default_file;
return _fileExists(request, path);
}
#ifdef ESP32
#define FILE_IS_REAL(f) (f == true && !f.isDirectory())
#else
#define FILE_IS_REAL(f) (f == true)
#endif
bool AsyncStaticWebHandler::_fileExists(AsyncWebServerRequest *request, const String& path)
{
bool fileFound = false;
bool gzipFound = false;
String gzip = path + ".gz";
if (_gzipFirst) {
request->_tempFile = _fs.open(gzip, "r");
gzipFound = FILE_IS_REAL(request->_tempFile);
if (!gzipFound){
request->_tempFile = _fs.open(path, "r");
fileFound = FILE_IS_REAL(request->_tempFile);
}
} else {
request->_tempFile = _fs.open(path, "r");
fileFound = FILE_IS_REAL(request->_tempFile);
if (!fileFound){
request->_tempFile = _fs.open(gzip, "r");
gzipFound = FILE_IS_REAL(request->_tempFile);
}
}
bool found = fileFound || gzipFound;
if (found) {
// Extract the file name from the path and keep it in _tempObject
size_t pathLen = path.length();
char * _tempPath = (char*)malloc(pathLen+1);
snprintf(_tempPath, pathLen+1, "%s", path.c_str());
request->_tempObject = (void*)_tempPath;
// Calculate gzip statistic
_gzipStats = (_gzipStats << 1) + (gzipFound ? 1 : 0);
if (_gzipStats == 0x00) _gzipFirst = false; // All files are not gzip
else if (_gzipStats == 0xFF) _gzipFirst = true; // All files are gzip
else _gzipFirst = _countBits(_gzipStats) > 4; // IF we have more gzip files - try gzip first
}
return found;
}
uint8_t AsyncStaticWebHandler::_countBits(const uint8_t value) const
{
uint8_t w = value;
uint8_t n;
for (n=0; w!=0; n++) w&=w-1;
return n;
}
void AsyncStaticWebHandler::handleRequest(AsyncWebServerRequest *request)
{
// Get the filename from request->_tempObject and free it
String filename = String((char*)request->_tempObject);
free(request->_tempObject);
request->_tempObject = NULL;
if((_username != "" && _password != "") && !request->authenticate(_username.c_str(), _password.c_str()))
return request->requestAuthentication();
if (request->_tempFile == true) {
String etag = String(request->_tempFile.size());
if (_last_modified.length() && _last_modified == request->header("If-Modified-Since")) {
request->_tempFile.close();
request->send(304); // Not modified
} else if (_cache_control.length() && request->hasHeader("If-None-Match") && request->header("If-None-Match").equals(etag)) {
request->_tempFile.close();
AsyncWebServerResponse * response = new AsyncBasicResponse(304); // Not modified
response->addHeader("Cache-Control", _cache_control);
response->addHeader("ETag", etag);
request->send(response);
} else {
AsyncWebServerResponse * response = new AsyncFileResponse(request->_tempFile, filename, String(), false, _callback);
if (_last_modified.length())
response->addHeader("Last-Modified", _last_modified);
if (_cache_control.length()){
response->addHeader("Cache-Control", _cache_control);
response->addHeader("ETag", etag);
}
request->send(response);
}
} else {
request->send(404);
}
}