src/XMLDocumentConstructor.h
author František Kučera <franta-hg@frantovo.cz>
Sat, 06 Feb 2021 20:32:26 +0100
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normalize header names to lower case
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/**
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 * Relational pipes
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 * Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, version 3 of the License.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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 */
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#pragma once
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#include <codecvt>
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#include <vector>
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#include <libxml++-2.6/libxml++/libxml++.h>
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#include <vmime/vmime.hpp>
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#include "XMLNameCodec.h"
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namespace relpipe {
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namespace in {
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namespace xmltable {
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class XMLDocumentConstructor {
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private:
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	std::istream* input = nullptr;
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	xmlpp::DomParser* parser = nullptr;
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	XMLNameCodec nameCodec;
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	std::string rootName = "mime-message";
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	std::string format(std::shared_ptr<vmime::datetime> value) {
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		std::stringstream timestamp;
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		int tz = value->getZone();
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		timestamp << value->getYear() << "-";
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		timestamp << std::setw(2) << std::setfill('0') << value->getMonth() << "-";
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		timestamp << std::setw(2) << std::setfill('0') << value->getDay() << "T";
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		timestamp << std::setw(2) << std::setfill('0') << value->getHour() << ":";
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		timestamp << std::setw(2) << std::setfill('0') << value->getMinute() << ":";
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		timestamp << std::setw(2) << std::setfill('0') << value->getSecond() << (tz >= 0 ? "+" : "-");
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		timestamp << std::setw(2) << std::setfill('0') << std::abs(tz / 60) << ":";
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		timestamp << std::setw(2) << std::setfill('0') << std::abs(tz % 60);
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		return timestamp.str();
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	}
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	std::string format(const vmime::mediaType& contentType) {
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		return contentType.getType() + "/" + contentType.getSubType();
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	}
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	std::string toLowerCase(const std::string& value) {
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		std::string result = value;
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		std::transform(result.begin(), result.end(), result.begin(), ::tolower);
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		return result;
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	}
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	std::string fetchBody(std::shared_ptr<vmime::body> body) {
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		std::stringstream result;
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		vmime::utility::outputStreamAdapter resultAdapter(result);
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		const vmime::charset targetEncoding = vmime::charset("utf-8");
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		const vmime::charset sourceEncoding = body->getCharset();
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		vmime::shared_ptr <vmime::charsetConverter> charsetConverter = vmime::charsetConverter::create(sourceEncoding, targetEncoding);
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		vmime::shared_ptr <vmime::utility::charsetFilteredOutputStream> resultConverter = charsetConverter->getFilteredOutputStream(resultAdapter);
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		body->getContents()->extract(*resultConverter);
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		resultConverter->flush();
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		return result.str();
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	}
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	void appendBody(xmlpp::Element* element, std::shared_ptr<vmime::body> body) {
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		element->set_attribute("content-type", format(body->getContentType()));
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		// element->set_attribute("content-type-charset", body->getCharset().getName());
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		// element->set_attribute("content-transfer-encoding", body->getEncoding().getName());
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		if (body->getPartCount() == 0) {
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			element->add_child_cdata(fetchBody(body));
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		} else {
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			for (auto part : body->getPartList()) {
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				xmlpp::Element* partElement = element->add_child("part");
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				appendBody(partElement, part->getBody());
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			}
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		}
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	}
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public:
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	XMLDocumentConstructor(std::istream* input, xmlpp::DomParser* parser) : input(input), parser(parser) {
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	}
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	virtual ~XMLDocumentConstructor() {
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	}
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	void setOption(const std::string& uri, const std::string& value) {
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		if (uri == "root-name") rootName = value;
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		else throw std::invalid_argument(std::string("Invalid parser option: „") + uri + "“ with value: „" + value + "“");
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	}
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	void process() {
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		vmime::utility::inputStreamAdapter is(*input);
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		vmime::string data;
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		vmime::utility::outputStreamStringAdapter os(data);
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		vmime::utility::bufferedStreamCopy(is, os);
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		vmime::message m;
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		m.parse(data);
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		// vmime::shared_ptr<vmime::utility::inputStreamAdapter> is = vmime::make_shared<vmime::utility::inputStreamAdapter>(*input);
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		// m.parse(is, 0);
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		vmime::charset ch(vmime::charsets::UTF_8);
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		//std::cerr << "Subject:" << m.getHeader()->Subject()->getValue<vmime::text>()->getConvertedText(ch) << std::endl;
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		xmlpp::Element* root = parser->get_document()->create_root_node(rootName);
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		xmlpp::Element* headers = root->add_child("headers");
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		for (std::shared_ptr<vmime::headerField> mimeField : m.getHeader()->getFieldList()) {
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			// TODO: Are names always ASCII and subset of UTF-8?
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			xmlpp::Element* field = headers->add_child(toLowerCase(nameCodec.encode(mimeField->getName())));
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			if (auto value = mimeField->getValue<vmime::text>()) {
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				field->add_child_text(value->getConvertedText(ch));
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			} else if (auto value = mimeField->getValue<vmime::mailbox>()) {
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				std::string name = value->getName().getConvertedText(ch);
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				std::string email = value->getEmail().toString();
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				if (name.size()) field->set_attribute("name", name);
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				if (email.size()) field->add_child_text(email);
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			} else if (auto value = mimeField->getValue<vmime::addressList>()) {
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				for (auto address : value->getAddressList()) {
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					xmlpp::Element* addressField = field->add_child("address");
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					if (std::shared_ptr<vmime::mailbox> mailbox = std::dynamic_pointer_cast<vmime::mailbox> (address)) {
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						std::string name = mailbox->getName().getConvertedText(ch);
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						std::string email = mailbox->getEmail().toString();
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						if (name.size()) addressField->set_attribute("name", name);
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						if (email.size()) addressField->add_child_text(email);
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					} else if (std::shared_ptr<vmime::mailboxGroup> mailbox = std::dynamic_pointer_cast<vmime::mailboxGroup> (address)) {
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						// TODO: mailboxGroup?
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					}
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				}
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			} else if (auto value = mimeField->getValue<vmime::datetime>()) {
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				// TODO: keep particular timestamp bits attributes or not?
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				field->set_attribute("year", std::to_string(value->getYear()));
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				field->set_attribute("month", std::to_string(value->getMonth()));
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				field->set_attribute("day", std::to_string(value->getDay()));
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				field->set_attribute("hour", std::to_string(value->getHour()));
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				field->set_attribute("minute", std::to_string(value->getMinute()));
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				field->set_attribute("second", std::to_string(value->getSecond()));
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				field->set_attribute("zone", std::to_string(value->getZone())); // timezone is in minutes
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				field->add_child_text(format(value));
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			} else if (auto value = mimeField->getValue<vmime::mediaType>()) {
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				if (value) field->add_child_text(format(*value));
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				// TODO: encoding from the "Content-Type: text/plain; charset=us-ascii" type header?
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			} else if (auto value = mimeField->getValue<vmime::messageId>()) {
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				field->add_child_text(value->getId());
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			} else if (auto value = mimeField->getValue<vmime::messageIdSequence>()) {
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				for (auto messageId : value->getMessageIdList()) {
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					xmlpp::Element* messageIdField = field->add_child("Mssage-ID"); // TODO: lower case?
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					messageIdField->add_child_text(messageId->getId());
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				}
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			} else if (auto value = mimeField->getValue<vmime::contentDisposition>()) {
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				field->add_child_text(value->getName());
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			} else if (auto value = mimeField->getValue<vmime::relay>()) {
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				field->set_attribute("from", value->getFrom());
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				field->set_attribute("via", value->getVia());
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				field->set_attribute("by", value->getBy());
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				field->set_attribute("id", value->getId());
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				field->set_attribute("for", value->getFor());
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				// TODO: date of Received/relay
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				// TODO: missing values or incomplete parsing of Received/relay in vmime
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			} else if (auto value = mimeField->getValue<vmime::path>()) {
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				std::string local = value->getLocalPart();
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				std::string domain = value->getDomain();
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				if (local.size() && domain.size()) field->add_child_text(local + "@" + domain);
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				else field->add_child_text(local + domain);
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			} else if (auto value = mimeField->getValue<vmime::encoding>()) {
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				field->add_child_text(value->getName());
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			} else {
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				field->add_child_text("TODO: unknown header type"); // TODO: generic conversion as fallback?
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			}
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		}
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		// TODO: check null pointers
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		xmlpp::Element* body = root->add_child("body");
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		appendBody(body, m.getBody());
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0
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	}
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};
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}
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}
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}