esp8266/libraries/ESP8266WebServer/src/detail/RequestHandlersImpl.h

#ifndef REQUESTHANDLERSIMPL_H
#define REQUESTHANDLERSIMPL_H

#include "RequestHandler.h"

class FunctionRequestHandler : public RequestHandler {
public:
    FunctionRequestHandler(ESP8266WebServer::THandlerFunction fn, const char* uri, HTTPMethod method)
    : _fn(fn)
    , _uri(uri)
    , _method(method)
    {
    }

    bool handle(ESP8266WebServer& server, HTTPMethod requestMethod, String requestUri) override {
        if (_method != HTTP_ANY && _method != requestMethod)
            return false;

        if (requestUri != _uri)
            return false;

        _fn();
        return true;
    }

protected:
    String _uri;
    HTTPMethod _method;
    ESP8266WebServer::THandlerFunction _fn;
};

class StaticRequestHandler : public RequestHandler {
public:
    StaticRequestHandler(FS& fs, const char* path, const char* uri, const char* cache_header)
    : _fs(fs)
    , _uri(uri)
    , _path(path)
    , _cache_header(cache_header)
    {
        _isFile = fs.exists(path);
        DEBUGV("StaticRequestHandler: path=%s uri=%s isFile=%d, cache_header=%s\r\n", path, uri, _isFile, cache_header);
        _baseUriLength = _uri.length(); 
    }
    bool handle(ESP8266WebServer& server, HTTPMethod requestMethod, String requestUri) override {
        if (requestMethod != HTTP_GET)
            return false;
        DEBUGV("StaticRequestHandler::handle: request=%s _uri=%s\r\n", requestUri.c_str(), _uri.c_str());
        if (!requestUri.startsWith(_uri))
            return false; 

        String path(_path); 

        if(path.endsWith("/")) path += "index.htm";

        if (!_isFile) { 
            // Base URI doesn't point to a file. Append whatever follows this
            // URI in request to get the file path.
            path += requestUri.substring(_baseUriLength); 
        }

        else if (requestUri != _uri) {
            // Base URI points to a file but request doesn't match this URI exactly
            return false;
        }
        DEBUGV("StaticRequestHandler::handle: path=%s, isFile=%d\r\n", path.c_str(), _isFile);

        String contentType = getContentType(path);
        
        // look for gz file, only if the original specified path is not a gz.  So part only works to send gzip via content encoding when a non compressed is asked for
        // if you point the the path to gzip you will serve the gzip as content type "application/x-gzip", not text or javascript etc... 
        if (!path.endsWith(".gz") && !SPIFFS.exists(path))  { 
            String pathWithGz = path + ".gz";
            if(SPIFFS.exists(pathWithGz))
                path += ".gz";
        }

        File f = _fs.open(path, "r");
        if (!f)
            return false;

        if (_cache_header.length() != 0) 
            server.sendHeader("Cache-Control", _cache_header);
        
        server.streamFile(f, contentType);
        return true;
    }

    static String getContentType(const String& path) {
        if (path.endsWith(".html")) return "text/html";
        else if (path.endsWith(".htm")) return "text/html";
        else if (path.endsWith(".css")) return "text/css";
        else if (path.endsWith(".txt")) return "text/plain";
        else if (path.endsWith(".js")) return "application/javascript";
        else if (path.endsWith(".png")) return "image/png";
        else if (path.endsWith(".gif")) return "image/gif";
        else if (path.endsWith(".jpg")) return "image/jpeg";
        else if (path.endsWith(".ico")) return "image/x-icon";
        else if (path.endsWith(".svg")) return "image/svg+xml";
        else if (path.endsWith(".xml")) return "text/xml";
        else if (path.endsWith(".pdf")) return "application/pdf";
        else if (path.endsWith(".zip")) return "application/zip";
        else if(path.endsWith(".gz")) return "application/x-gzip";
        return "application/octet-stream";
    }

protected:
    FS _fs;
    String _uri;
    String _path;
    String _cache_header; 
    bool _isFile;
    size_t _baseUriLength;
};


#endif //REQUESTHANDLERSIMPL_H