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// gmime.h pulls in glib's gio headers, which declare a struct field named
// "signals". Qt's <QtCore/qnamespace.h> #defines "signals" to "Q_SIGNALS"
// (unless QT_NO_KEYWORDS is set), so gmime.h must be included before any Qt
// header in this translation unit to avoid a macro collision.
#include <gmime/gmime.h>
#include "mimeparser.h"
#include <QDir>
#include <QFile>
#include <QFileInfo>
#include <QRegularExpression>
#include <QUuid>
namespace {
/// GMime must be initialised exactly once per process.
void ensureGMimeInit()
{
static bool initialised = false;
if (!initialised) {
g_mime_init();
initialised = true;
}
}
QString fromGChar(char *owned)
{
if (!owned)
return {};
const QString result = QString::fromUtf8(owned);
g_free(owned);
return result;
}
QString headerText(GMimeMessage *message, const char *name)
{
GMimeHeaderList *headers = g_mime_object_get_header_list(
GMIME_OBJECT(message));
if (!headers)
return {};
GMimeHeader *header = g_mime_header_list_get_header(headers, name);
if (!header)
return {};
// get_value() returns the RFC 2047-decoded value.
return QString::fromUtf8(g_mime_header_get_value(header));
}
QByteArray decodePart(GMimePart *part)
{
GMimeDataWrapper *content = g_mime_part_get_content(part);
if (!content)
return {};
GMimeStream *memStream = g_mime_stream_mem_new();
g_mime_data_wrapper_write_to_stream(content, memStream);
g_mime_stream_flush(memStream);
GByteArray *bytes = g_mime_stream_mem_get_byte_array(
GMIME_STREAM_MEM(memStream));
QByteArray result(reinterpret_cast<const char *>(bytes->data), bytes->len);
g_object_unref(memStream);
return result;
}
/// Walks the MIME tree, filling the parsed message.
void collectParts(GMimeObject *object, ParsedMessage &out)
{
if (GMIME_IS_MULTIPART(object)) {
GMimeMultipart *multipart = GMIME_MULTIPART(object);
const int count = g_mime_multipart_get_count(multipart);
for (int i = 0; i < count; ++i)
collectParts(g_mime_multipart_get_part(multipart, i), out);
return;
}
if (GMIME_IS_MESSAGE_PART(object)) {
GMimeMessage *sub = g_mime_message_part_get_message(
GMIME_MESSAGE_PART(object));
if (sub)
collectParts(g_mime_message_get_mime_part(sub), out);
return;
}
if (!GMIME_IS_PART(object))
return;
GMimePart *part = GMIME_PART(object);
GMimeContentType *contentType = g_mime_object_get_content_type(object);
// g_mime_content_type_get_mime_type() returns a newly-allocated string
// that must be freed; fromGChar() takes ownership of it.
const QString mimeType = contentType
? fromGChar(g_mime_content_type_get_mime_type(contentType))
: QStringLiteral("application/octet-stream");
const char *disposition = g_mime_object_get_disposition(object);
const bool isAttachment =
disposition && g_ascii_strcasecmp(disposition, "attachment") == 0;
const char *contentId = g_mime_part_get_content_id(part);
if (isAttachment) {
Attachment attachment;
attachment.mimeType = mimeType;
attachment.data = decodePart(part);
const char *filename = g_mime_part_get_filename(part);
attachment.filename = filename
? QString::fromUtf8(filename)
: QStringLiteral("attachment");
out.attachments.append(attachment);
return;
}
if (contentId) {
// Strip the angle brackets so the key matches a cid: URL body.
QString id = QString::fromUtf8(contentId);
if (id.startsWith(QLatin1Char('<')) && id.endsWith(QLatin1Char('>')))
id = id.mid(1, id.size() - 2);
out.inlineParts.insert(id, InlinePart{ mimeType, decodePart(part) });
return;
}
if (mimeType == QLatin1String("text/plain") && out.plainBody.isEmpty()) {
out.plainBody = QString::fromUtf8(decodePart(part));
} else if (mimeType == QLatin1String("text/html") && out.htmlBody.isEmpty()) {
out.htmlBody = QString::fromUtf8(decodePart(part));
}
}
} // namespace
QString Attachment::safeFilename() const
{
// Reduce to a basename: QFileInfo handles '/', and backslashes are stripped
// explicitly because a Windows-authored name can carry them.
QString name = filename;
name.replace(QLatin1Char('\\'), QLatin1Char('/'));
name = QFileInfo(name).fileName();
// A name of "..", "." or empty leaves nothing usable.
if (name.isEmpty() || name == QLatin1String(".") || name == QLatin1String(".."))
return QStringLiteral("attachment-%1").arg(
QUuid::createUuid().toString(QUuid::Id128).left(8));
return name;
}
QString Attachment::saveTo(const QString &directory, QString *error) const
{
const QDir dir(directory);
const QString target = dir.absoluteFilePath(safeFilename());
// Belt and braces: confirm the resolved path really is inside directory,
// so a future change to safeFilename() cannot silently reintroduce escape.
const QString canonicalDir = QDir(directory).absolutePath();
if (!QFileInfo(target).absolutePath().startsWith(canonicalDir)) {
if (error)
*error = QStringLiteral("Refusing to write outside %1").arg(canonicalDir);
return {};
}
QFile file(target);
if (!file.open(QIODevice::WriteOnly)) {
if (error)
*error = file.errorString();
return {};
}
file.write(data);
file.close();
return target;
}
MimeParser::MimeParser()
{
ensureGMimeInit();
}
ParsedMessage MimeParser::parse(const QString &filePath) const
{
ParsedMessage out;
FILE *fp = fopen(filePath.toLocal8Bit().constData(), "r");
if (!fp) {
out.error = QStringLiteral("Cannot open %1").arg(filePath);
return out;
}
GMimeStream *stream = g_mime_stream_file_new(fp);
GMimeParser *parser = g_mime_parser_new_with_stream(stream);
GMimeMessage *message = g_mime_parser_construct_message(parser, nullptr);
g_object_unref(parser);
g_object_unref(stream);
if (!message) {
out.error = QStringLiteral("Cannot parse %1").arg(filePath);
return out;
}
out.subject = QString::fromUtf8(
g_mime_message_get_subject(message) ?: "");
out.from = headerText(message, "From");
out.to = headerText(message, "To");
out.cc = headerText(message, "Cc");
out.date = headerText(message, "Date");
out.messageId = QString::fromUtf8(
g_mime_message_get_message_id(message) ?: "");
GMimeObject *body = g_mime_message_get_mime_part(message);
if (body)
collectParts(body, out);
g_object_unref(message);
out.ok = true;
return out;
}
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