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103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/**
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@file
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@author Stefan Frings
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*/
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#ifndef STATICFILECONTROLLER_H
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#define STATICFILECONTROLLER_H
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#include <QCache>
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#include <QMutex>
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#include "httpglobal.h"
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#include "httprequest.h"
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#include "httpresponse.h"
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#include "httprequesthandler.h"
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namespace qtwebapp {
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/**
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Delivers static files. It is usually called by the applications main request handler when
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the caller requests a path that is mapped to static files.
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<p>
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The following settings are required in the config file:
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<code><pre>
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path=../docroot
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encoding=UTF-8
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maxAge=60000
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cacheTime=60000
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cacheSize=1000000
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maxCachedFileSize=65536
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</pre></code>
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The path is relative to the directory of the config file. In case of windows, if the
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settings are in the registry, the path is relative to the current working directory.
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<p>
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The encoding is sent to the web browser in case of text and html files.
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<p>
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The cache improves performance of small files when loaded from a network
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drive. Large files are not cached. Files are cached as long as possible,
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when cacheTime=0. The maxAge value (in msec!) controls the remote browsers cache.
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<p>
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Do not instantiate this class in each request, because this would make the file cache
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useless. Better create one instance during start-up and call it when the application
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received a related HTTP request.
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*/
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class HttpDocrootSettings;
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class DECLSPEC StaticFileController : public HttpRequestHandler {
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Q_OBJECT
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Q_DISABLE_COPY(StaticFileController)
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public:
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/** Constructor with Qt settings*/
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StaticFileController(QSettings* settings, QObject* parent = NULL);
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/** Constructor with settings structure */
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StaticFileController(const HttpDocrootSettings& settings, QObject* parent = NULL);
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/** Generates the response from HTTP request */
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void service(HttpRequest& request, HttpResponse& response);
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/** Generates the response directly from the path */
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void service(QByteArray& path, HttpResponse& response);
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private:
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/** Encoding of text files */
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QString encoding;
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/** Root directory of documents */
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QString docroot;
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/** Maximum age of files in the browser cache */
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int maxAge;
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struct CacheEntry {
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QByteArray document;
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qint64 created;
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QByteArray filename;
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};
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/** Timeout for each cached file */
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int cacheTimeout;
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/** Maximum size of files in cache, larger files are not cached */
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int maxCachedFileSize;
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/** Cache storage */
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QCache<QString,CacheEntry> cache;
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/** Used to synchronize cache access for threads */
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QMutex mutex;
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/** Settings flag */
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bool useQtSettings;
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/** Set a content-type header in the response depending on the ending of the filename */
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void setContentType(QString file, HttpResponse& response) const;
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};
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} // end of namespace
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#endif // STATICFILECONTROLLER_H
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