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/*
Copyright (C) 2015 Sandro Knauß <knauss@kolabsys.com>
Copyright (C) 2001,2002 the KPGP authors
See file AUTHORS.kpgp for details
Kmail 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.
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
*/
#include "cryptohelper.h"
using namespace MimeTreeParser;
PGPBlockType Block::determineType() const
{
const QByteArray data = text();
if (data.startsWith("-----BEGIN PGP SIGNED")) {
return ClearsignedBlock;
} else if (data.startsWith("-----BEGIN PGP SIGNATURE")) {
return SignatureBlock;
} else if (data.startsWith("-----BEGIN PGP PUBLIC")) {
return PublicKeyBlock;
} else if (data.startsWith("-----BEGIN PGP PRIVATE")
|| data.startsWith("-----BEGIN PGP SECRET")) {
return PrivateKeyBlock;
} else if (data.startsWith("-----BEGIN PGP MESSAGE")) {
if (data.startsWith("-----BEGIN PGP MESSAGE PART")) {
return MultiPgpMessageBlock;
} else {
return PgpMessageBlock;
}
} else if (data.startsWith("-----BEGIN PGP ARMORED FILE")) {
return PgpMessageBlock;
} else if (data.startsWith("-----BEGIN PGP ")) {
return UnknownBlock;
} else {
return NoPgpBlock;
}
}
QList<Block> MimeTreeParser::prepareMessageForDecryption(const QByteArray &msg)
{
PGPBlockType pgpBlock = NoPgpBlock;
QList<Block> blocks;
int start = -1; // start of the current PGP block
int lastEnd = -1; // end of the last PGP block
const int length = msg.length();
if (msg.isEmpty()) {
return blocks;
}
if (msg.startsWith("-----BEGIN PGP ")) {
start = 0;
} else {
start = msg.indexOf("\n-----BEGIN PGP ") + 1;
if (start == 0) {
blocks.append(Block(msg, NoPgpBlock));
return blocks;
}
}
while (start != -1) {
int nextEnd, nextStart;
// is the PGP block a clearsigned block?
if (!strncmp(msg.constData() + start + 15, "SIGNED", 6)) {
pgpBlock = ClearsignedBlock;
} else {
pgpBlock = UnknownBlock;
}
nextEnd = msg.indexOf("\n-----END PGP ", start + 15);
nextStart = msg.indexOf("\n-----BEGIN PGP ", start + 15);
if (nextEnd == -1) { // Missing END PGP line
if (lastEnd != -1) {
blocks.append(Block(msg.mid(lastEnd + 1), UnknownBlock));
} else {
blocks.append(Block(msg.mid(start), UnknownBlock));
}
break;
}
if ((nextStart == -1) || (nextEnd < nextStart) || (pgpBlock == ClearsignedBlock)) {
// most likely we found a PGP block (but we don't check if it's valid)
// store the preceding non-PGP block
if (start - lastEnd - 1 > 0) {
blocks.append(Block(msg.mid(lastEnd + 1, start - lastEnd - 1), NoPgpBlock));
}
lastEnd = msg.indexOf("\n", nextEnd + 14);
if (lastEnd == -1) {
if (start < length) {
blocks.append(Block(msg.mid(start)));
}
break;
} else {
blocks.append(Block(msg.mid(start, lastEnd + 1 - start)));
if ((nextStart != -1) && (nextEnd > nextStart)) {
nextStart = msg.indexOf("\n-----BEGIN PGP ", lastEnd + 1);
}
}
}
start = nextStart;
if (start == -1) {
if (lastEnd + 1 < length) {
//rest of mail is no PGP Block
blocks.append(Block(msg.mid(lastEnd + 1), NoPgpBlock));
}
break;
} else {
start++; // move start behind the '\n'
}
}
return blocks;
}
Block::Block(const QByteArray &m)
: msg(m)
{
mType = determineType();
}
Block::Block(const QByteArray &m, PGPBlockType t)
: msg(m)
, mType(t)
{
}
QByteArray MimeTreeParser::Block::text() const
{
return msg;
}
PGPBlockType Block::type() const
{
return mType;
}
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