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Implement deep indexing for files through Xapian

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ATM it support extracting metadata only from OGG files.
The system has been designed to be easly extensible to more file formats
  registering more indexer functions which just need to extract metadata
  from a certain type of file and feed it to Xapian.
The system has been integrated into existent file search system to
  through generric search requests and results, it keep a good level of
  retro-compatibility due to some tricks.
The indexing system is released under AGPLv3  so when libretroshare is compiled
  with deep search enabled AGPLv3 must be honored instead of LGPLv3-or-later.
Cleaned up the debian copyright file using non-deprecated license
  code-names.
This commit is contained in:
Gioacchino Mazzurco 2019-06-20 17:24:18 +02:00
parent d46e3eb2b7
commit 3a26ccf6a5
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25 changed files with 1364 additions and 438 deletions
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97
libretroshare/src/deep_search/filesoggindexer.hpp Normal file
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/*******************************************************************************
* RetroShare full text indexing and search implementation based on Xapian *
* *
* Copyright (C) 2018-2019 Gioacchino Mazzurco <gio@eigenlab.org> *
* Copyright (C) 2019 Asociación Civil Altermundi <info@altermundi.net> *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU Affero General Public License version 3 as *
* published by the Free Software Foundation. *
* *
* 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 Affero General Public License for more details. *
* *
* You should have received a copy of the GNU Affero General Public License *
* along with this program. If not, see <https://www.gnu.org/licenses/>. *
* *
*******************************************************************************/
#include "deep_search/filesindex.hpp"
#include "util/rsdebug.h"
#include <xapian.h>
#include <string>
#include <vorbis/vorbisfile.h>
#include <cctype>
struct RsDeepOggFileIndexer
{
RsDeepOggFileIndexer()
{
DeepFilesIndex::registerIndexer(30, indexOggFile);
}
static uint32_t indexOggFile(
const std::string& path, const std::string& /*name*/,
Xapian::TermGenerator& xTG, Xapian::Document& xDoc )
{
Dbg3() << __PRETTY_FUNCTION__ << " " << path << std::endl;
OggVorbis_File vf;
int ret = ov_fopen(path.c_str(), &vf);
if(ret == 0 && vf.vc)
{
vorbis_comment& vc = *vf.vc;
std::string docData = xDoc.get_data();
for (int i = 0; i < vc.comments; ++i)
{
using szt = std::string::size_type;
std::string userComment(
vc.user_comments[i],
static_cast<szt>(vc.comment_lengths[i]) );
if(userComment.empty()) continue;
szt equalPos = userComment.find('=');
if(equalPos == std::string::npos) continue;
std::string tagName = userComment.substr(0, equalPos);
if(tagName.empty()) continue;
std::string tagValue = userComment.substr(equalPos + 1);
if(tagValue.empty()) continue;
/* Ogg tags should be uppercases but not all the softwares
* enforce it */
for (auto& c: tagName) c = static_cast<char>(toupper(c));
if(tagName == "ARTIST")
xTG.index_text(tagValue, 1, "A");
else if (tagName == "DESCRIPTION")
xTG.index_text(tagValue, 1, "XD");
else if (tagName == "TITLE")
xTG.index_text(tagValue, 1, "S");
if(tagName.find("COVERART") != tagName.npos)
continue; // Avoid polluting the index with binary data
else if (tagName.find("METADATA_BLOCK_PICTURE") != tagName.npos)
continue; // Avoid polluting the index with binary data
// Index fields without prefixes for general search.
xTG.increase_termpos();
xTG.index_text(userComment);
docData += userComment + "\n";
}
xDoc.set_data(docData);
ov_clear(&vf);
return 99;
}
return 0;
}
RS_SET_CONTEXT_DEBUG_LEVEL(2)
};