File indexing completed on 2024-04-14 04:52:02

 /**************************************************************************
  *   Copyright (C) 2009-2011 Matthias Fuchs <mat69@gmx.net>                *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
  *   the Free Software Foundation; either version 2 of the License, or     *
  *   (at your option) any later version.                                   *
  *                                                                         *
  *   This program 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 General Public License for more details.                          *
  *                                                                         *
  *   You should have received a copy of the GNU General Public License     *
  *   along with this program; if not, write to the                         *
  *   Free Software Foundation, Inc.,                                       *
  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
  ***************************************************************************/
 
 #ifndef VERIFIER_H
 #define VERIFIER_H
 
 #include <QUrl>
 #include <kio/global.h>
 
 #include <QHash>
 #include <QModelIndex>
 #include <QStringList>
 
 #include "kget_export.h"
 
 class QDomElement;
 class VerificationModel;
 class VerifierPrivate;
 typedef QPair<QString, QString> Checksum;
 
 class KGET_EXPORT PartialChecksums
 {
 public:
     PartialChecksums()
         : m_length(0)
     {
     }
 
     PartialChecksums(KIO::filesize_t len, const QStringList &sums)
         : m_length(len)
         , m_checksums(sums)
     {
     }
 
     bool isValid() const
     {
         return (length() && m_checksums.count());
     }
 
     KIO::filesize_t length() const
     {
         return m_length;
     }
     void setLength(KIO::filesize_t length)
     {
         m_length = length;
     }
 
     QStringList checksums() const
     {
         return m_checksums;
     }
     void setChecksums(const QStringList &checksums)
     {
         m_checksums = checksums;
     }
 
 private:
     KIO::filesize_t m_length;
     QStringList m_checksums;
 };
 
 Q_DECLARE_METATYPE(PartialChecksums)
 
 class KGET_EXPORT Verifier : public QObject
 {
     Q_OBJECT
 
 public:
     explicit Verifier(const QUrl &dest, QObject *parent = nullptr);
     ~Verifier() override;
 
     enum VerificationStatus {
         NoResult, // either not tried, or not enough information
         NotVerified,
         Verified
     };
 
     enum ChecksumStrength { Weak, Strong, Strongest };
 
     /**
      * @returns the object path that will be shown in the DBUS interface
      */
     QString dBusObjectPath() const;
 
     QUrl destination() const;
     void setDestination(const QUrl &destination); // TODO handle the case when m_thread is working, while the file gets moved
 
     VerificationStatus status() const;
 
     /**
      * Returns the supported verification types
      * @return the supported verification types (e.g. MD5, SHA1 ...)
      */
     static QStringList supportedVerficationTypes();
 
     /**
      * Returns the diggest length of type
      * @param type the checksum type for which to get the diggest length
      * @return the length the diggest should have
      */
     static int diggestLength(const QString &type);
 
     /**
      * Tries to check if the checksum is a checksum and if it is supported
      * it compares the diggestLength and checks if there are only alphanumerics in checksum
      * @param type of the checksum
      * @param checksum the checksum you want to check
      */
     static bool isChecksum(const QString &type, const QString &checksum);
 
     /**
      * Cleans the checksum type, that it should match the official name, i.e. upper case
      * e.g. SHA-1 instead of sha1
      */
     static QString cleanChecksumType(const QString &type);
 
     /**
      * Creates the checksum type of the file @p dest
      * @param dest the destination
      * @param type the type of the checksum
      * @param abortPtr makes it possible to abort the calculation of the checksum from another thread
      */
     static QString checksum(const QUrl &dest, const QString &type, bool *abortPtr);
 
     /**
      * Create partial checksums of type for file @p dest
      * @param dest the destination
      * @param type the type of the checksum
      * @param length the file length
      * @param abortPtr makes it possible to abort the calculation of the checksums from another thread
      * @note the length of the partial checksum (if not defined = 0) is not less than 512 kb
      * and there won't be more partial checksums than 101
      */
     static PartialChecksums partialChecksums(const QUrl &dest, const QString &type, KIO::filesize_t length = 0, bool *abortPtr = nullptr);
 
     /**
      * @note only call verify() when this function returns true
      * @return true if the downloaded file exists and a supported checksum is set
      */
     bool isVerifyable() const;
 
     /**
      * Convenience function if only a row of the model should be checked
      * @note only call verify() when this function returns true
      * @param index the row in the model of the checksum
      * @return true if the downloaded file exists and a supported checksum is set
      */
     bool isVerifyable(const QModelIndex &index) const;
 
     /**
      * Call this method if you want to verify() in its own thread, then signals with
      * the result are emitted
      * @param index row of the model should be checked, if not defined the a checkum defined by
      * Verifier::ChecksumStrength will be used
      */
     void verify(const QModelIndex &index = QModelIndex());
 
     /**
      * Call this method after calling verify() with a negative result, it will
      * Q_EMIT a list of the broken pieces, if PartialChecksums were defined,
      * otherwise and in case of any error an empty list will be emitted
      */
     void brokenPieces() const;
 
     /**
      * Add a checksum that is later used in the verification process
      * @note only one checksum per type can be added (one MD5, one SHA1 etc.),
      * the newer overwrites the older and a checksum can only be added if it is
      * supported by the verifier
      * @param type the type of the checksum
      * @param checksum the checksum
      * @param verified if the file has been verified using this checksum
      * @note uses VerificationModel internally
      * @see VerificationModel
      */
     void addChecksum(const QString &type, const QString &checksum, int verified = 0);
 
     /**
      * Add multiple checksums that will later be used in the verification process
      * @note only one checksum per type can be added (one MD5, one SHA1 etc.),
      * the newer overwrites the older and a checksum can only be added if it is
      * supported by the verifier
      * @param checksums <type, checksum>
      * @note uses VerificationModel internally
      * @see VerificationModel
      */
     void addChecksums(const QMultiHash<QString, QString> &checksums);
 
     /**
      * Add partial checksums that can be used as repairinformation
      * @note only one checksum per type can be added (one MD5, one SHA1 etc.),
      * the newer overwrites the older and a checksum can only be added if it is
      * supported by the verifier
      * @param type the type of the checksums
      * @param length the length of each piece
      * @param checksums the checksums, first entry is piece number 0
      */
     void addPartialChecksums(const QString &type, KIO::filesize_t length, const QStringList &checksums);
 
     /**
      * Returns the length of the "best" partialChecksums
      */
     KIO::filesize_t partialChunkLength() const;
 
     /**
      * Returns a checksum and a type
      * @param strength the strength the checksum-type should have;
      * weak is md5 > md4 (md5 preferred), strong is sha1 > ripmed160 >
      * sha256 > sha384 > sha512 (sha1 preferred), strongest is sha512 >
      * sha384 > sha256 .... < (sha512 preferred)
      * If the category does not match then any checksum is taken
      */
     Checksum availableChecksum(ChecksumStrength strength) const;
 
     /**
      * Returns all set checksums
      */
     QList<Checksum> availableChecksums() const;
 
     /**
      * Returns a PartialChecksum and a type
      * @param strength the strength the checksum-type should have;
      * weak is md5 > md4 > ... (md5 preferred), strong is sha1 > ripmed160 >
      * sha256 > sha384 > sha512 > ... (sha1 preferred), strongest is sha512 >
      * sha384 > sha256 ... (sha512 preferred)
      * If the category does not match then any checksum is taken
      */
     QPair<QString, PartialChecksums *> availablePartialChecksum(Verifier::ChecksumStrength strength) const;
 
     /**
      * @return the model that stores the hash-types and checksums
      */
     VerificationModel *model();
 
     void save(const QDomElement &element);
     void load(const QDomElement &e);
 
 Q_SIGNALS:
     /**
      * Emitted when the verification of a file finishes
      */
     void verified(bool verified);
 
     /**
      * Emitted when brokenPiecesThreaded finishes, the list can be empty, while length will be always set
      */
     void brokenPieces(const QList<KIO::fileoffset_t> &offsets, KIO::filesize_t length);
 
 private Q_SLOTS:
     void changeStatus(const QString &type, bool verified);
 
 private:
     VerifierPrivate *const d;
 
     friend class VerifierPrivate;
 };
 
 #endif // VERIFIER_H