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/* ============================================================================ |
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* Douglas Thrift's Search Engine License |
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* |
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* Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved. |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, if any, must |
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* include the following acknowledgment: |
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* |
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* "This product includes software developed by Douglas Thrift |
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* (http://computers.douglasthrift.net/searchengine/)." |
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* |
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* Alternately, this acknowledgment may appear in the software itself, if |
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* and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Douglas Thrift" and "Douglas Thrift's Search Engine" must not |
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* be used to endorse or promote products derived from this software without |
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* specific prior written permission. For written permission, please visit |
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* http://www.douglasthrift.net/contact.cgi for contact information. |
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* |
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* 5. Products derived from this software may not be called "Douglas Thrift's |
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* Search Engine", nor may "Douglas Thrift's Search Engine" appear in their |
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* name, without prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, |
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ============================================================================ |
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*/ |
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// Douglas Thrift's Search Engine Indexer |
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// |
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// Douglas Thrift |
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// |
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// Indexer.cpp |
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|
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#include "Indexer.h" |
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|
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Indexer::Indexer(string& indexFile, set<string>& domains, |
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set<string>& restrictions) |
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{ |
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this->indexFile = indexFile; |
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this->domains = domains; |
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this->restrictions = restrictions; |
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} |
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|
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void Indexer::index(string& begin) |
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{ |
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unsigned separator = indexFile.rfind(slash); |
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string dtd = separator != string::npos ? indexFile.substr(0, separator) + |
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slash + "index.dtd" : "index.dtd"; |
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|
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ifstream fin(dtd.c_str()); |
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|
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if (!fin.is_open()) |
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{ |
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ofstream fout(dtd.c_str()); |
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|
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fout << "<!ELEMENT index (page*)>\n" |
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<< "<!ELEMENT page (address, port?, path, title?, description?, ke" |
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<< "ywords?, text,\n" |
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<< " heading*)\n" |
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<< ">\n" |
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<< "<!ELEMENT address (#PCDATA)>\n" |
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<< "<!ELEMENT port (#PCDATA)>\n" |
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<< "<!ELEMENT path (#PCDATA)>\n" |
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<< "<!ELEMENT size (#PCDATA)>\n" |
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<< "<!ELEMENT title (#PCDATA)>\n" |
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<< "<!ELEMENT description (#PCDATA)>\n" |
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<< "<!ELEMENT text (#PCDATA)>\n" |
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<< "<!ELEMENT heading (#PCDATA)>\n"; |
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|
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fout.close(); |
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} |
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|
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fin.close(); |
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|
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ofstream fout(indexFile.c_str()); |
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|
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fout << "<?xml version=\"1.0\" encoding=\"ISO-8859-1\" standalone=\"no\"?>" |
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<< "\n<!DOCTYPE index SYSTEM \"index.dtd\">\n" |
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<< "<index>\n"; |
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|
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URL first(begin); |
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|
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index(first, fout); |
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|
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fout << "</index>\n"; |
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|
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fout.close(); |
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} |
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|
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void Indexer::index(URL& url, ofstream& fout, const string referer) |
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{ |
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if (domains.find(url.getAddress() += url.getPort() != 80 ? ":" + |
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url.getPort() : "") != domains.end() && pages.find(url.getURL()) == |
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pages.end()) |
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{ |
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if (checked.find(url.getAddress() += url.getPort() != 80 ? ":" + |
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url.getPort() : "") == checked.end()) |
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{ |
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robots(url); |
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} |
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|
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if (!restricted(url)) |
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{ |
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if (http.handle(url, referer, true)) |
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{ |
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if (http.contentType().find("text/plain") == 0 || |
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http.contentType().find("text/html") == 0) |
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{ |
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http.clear(); |
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if (!http.handle(url, referer)) exit(1); |
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|
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cout << "Indexing " << url << "..." << flush; |
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|
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if (processor.process(http, url)) |
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{ |
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Page page = processor.getPage(); |
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fout << page << "\n"; |
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|
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cout << "done.\n"; |
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} |
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else |
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{ |
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cout << "canceled.\n"; |
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} |
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|
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pages.insert(url.getURL()); |
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Set pageLinks = processor.getLinks(); |
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processor.reset(); |
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|
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for (SetIterator link = pageLinks.begin(); link != |
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pageLinks.end(); link++) |
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{ |
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if (pages.find(*link) == pages.end()) |
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{ |
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links.push(URL(*link)); |
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referers.push(url.getURL()); |
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} |
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} |
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} |
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else |
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{ |
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// unhandled content |
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} |
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} |
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else if (http.redirect() != "") |
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{ |
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if (pages.find(http.redirect()) == pages.end()) |
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{ |
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links.push(URL(http.redirect())); |
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referers.push(url.getURL()); |
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} |
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} |
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|
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http.clear(); |
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} |
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} |
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|
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if (!links.empty()) |
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{ |
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URL next = links.front(); |
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links.pop(); |
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|
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string referer = referers.front(); |
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referers.pop(); |
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|
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if (debug) cerr << "next = " << next << "\n"; |
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|
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index(next, fout, referer); |
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} |
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} |
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|
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bool Indexer::restricted(URL& url) |
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{ |
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bool answer = false; |
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|
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for (SetIterator itor = restrictions.begin(); itor != restrictions.end(); |
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itor++) |
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{ |
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URL checker = *itor; |
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|
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if (url.getAddress() == checker.getAddress() && url.getPort() == |
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checker.getPort()) |
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{ |
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if (url.getPath().find(checker.getPath()) == 0) |
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{ |
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answer = true; |
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break; |
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} |
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} |
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} |
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|
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return answer; |
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} |
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|
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void Indexer::robots(URL& url) |
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{ |
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URL robots = url; |
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robots.setPath("/robots.txt"); |
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|
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if (http.handle(robots)) |
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{ |
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cout << "Checking " << robots << "..." << flush; |
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|
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string line; |
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|
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bool record = false, hasVersion = false, hasName = false, hasAll = |
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false; |
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robot state = none; |
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Set restrictionsVersion, restrictionsName, restrictionsAll; |
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|
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while (http.good()) |
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{ |
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http.getline(line); |
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|
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unsigned comment = line.find('#'); |
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if (comment != string::npos) line.erase(comment); |
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|
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if (line == "" && comment == string::npos) record = false; |
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if (line == "") continue; |
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|
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unsigned colon = line.find(':'); |
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|
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string field = line.substr(0, colon); |
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string value = line.substr(colon + 1); |
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|
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normalize(value); |
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|
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if (field == "User-agent" && value == agent(true)) |
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{ |
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state = version; |
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record = true; |
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hasVersion = true; |
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} |
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else if (field == "User-agent" && value == agent(false)) |
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{ |
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state = name; |
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record = true; |
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hasName = true; |
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} |
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else if (field == "User-agent" && value == "*") |
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{ |
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state = all; |
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record = true; |
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hasAll = true; |
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} |
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else if (field == "Disallow" && record && value == "") |
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{ |
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// no restrictions |
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} |
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else if (field == "Disallow" && record) |
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{ |
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URL restriction = robots; |
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restriction.setPath(value); |
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|
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switch (state) |
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{ |
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case version: |
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restrictionsVersion.insert(restriction.getURL()); |
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break; |
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case name: |
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restrictionsName.insert(restriction.getURL()); |
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break; |
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case all: |
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restrictionsAll.insert(restriction.getURL()); |
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break; |
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default: |
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break; |
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} |
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} |
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} |
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|
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if (hasVersion) |
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{ |
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state = version; |
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} |
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else if (hasName) |
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{ |
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state = name; |
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} |
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else if (hasAll) |
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{ |
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state = all; |
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} |
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else |
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{ |
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state = none; |
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} |
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|
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SetIterator itor; |
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switch (state) |
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{ |
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case version: |
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for (itor = restrictionsVersion.begin(); itor != |
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restrictionsVersion.end(); itor++) |
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{ |
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restrictions.insert(*itor); |
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} |
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break; |
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case name: |
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for (itor = restrictionsName.begin(); itor != |
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restrictionsName.end(); itor++) |
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{ |
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restrictions.insert(*itor); |
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} |
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break; |
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case all: |
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for (itor = restrictionsAll.begin(); itor != |
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restrictionsAll.end(); itor++) |
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{ |
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restrictions.insert(*itor); |
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} |
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break; |
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default: |
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break; |
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} |
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|
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cout << "done.\n"; |
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} |
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|
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http.clear(); |
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|
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checked.insert(url.getAddress() += url.getPort() != 80 ? ":" + |
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url.getPort() : ""); |
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} |
