372 lines
10 KiB
Java
372 lines
10 KiB
Java
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/*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at <http://www.mozilla.org/MPL/>.
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*
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* Software distributed under the License is distributed on an "AS IS" basis, WITHOUT
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* WARRANTY OF ANY KIND, either express or implied. See the License for the specific
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* language governing rights and limitations under the License.
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*
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* The Original Code is the Venice Web Community System.
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*
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* The Initial Developer of the Original Code is Eric J. Bowersox <erbo@silcom.com>,
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* for Silverwrist Design Studios. Portions created by Eric J. Bowersox are
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* Copyright (C) 2001 Eric J. Bowersox/Silverwrist Design Studios. All Rights Reserved.
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*
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* Contributor(s):
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*/
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package com.silverwrist.venice.db;
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import java.sql.*;
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import com.silverwrist.util.StringUtil;
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import com.silverwrist.venice.ValidationException;
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import com.silverwrist.venice.core.IDUtils;
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public class PostLinkDecoder
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{
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/*--------------------------------------------------------------------------------
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* Static data members
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*--------------------------------------------------------------------------------
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*/
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private static final int MAX_LINK_LEN = 130;
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private static final int MAX_SIG_LEN = 32;
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private static final int MAX_CONF_LEN = 64;
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/*--------------------------------------------------------------------------------
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* Attributes
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*--------------------------------------------------------------------------------
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*/
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private String signame = null;
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private String confname = null;
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private short topicnum = -1;
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private int first_post = -1;
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private int last_post = -1;
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/*--------------------------------------------------------------------------------
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* Constructor
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*--------------------------------------------------------------------------------
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*/
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public PostLinkDecoder(String data) throws ValidationException
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{
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if (StringUtil.isStringEmpty(data))
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throw new ValidationException("empty string");
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if (data.length()>MAX_LINK_LEN)
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throw new ValidationException("post link string too long");
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// turn the data into a StringBuffer so we can parse it
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StringBuffer work = new StringBuffer(data);
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// First Test: Bang
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int pos = work.toString().indexOf('!');
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if (pos>0)
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{ // We have "sig!something" ... store off the SIG name
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setSIGName(work.substring(0,pos));
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work.delete(0,pos+1);
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if (work.length()==0)
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return; // we had just "sig!" - that's the syntax for a SIG link
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} // end if
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else if (pos==0)
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throw new ValidationException("! at beginning of string");
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// Second Test: Dot Number One
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pos = work.toString().indexOf('.');
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if (pos<0)
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{ // there's no dots in here...this must have been either "postlink" or "sig!conference"
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if (signame!=null) // it's "sig!conference"
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setConferenceName(work.toString());
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else // it's "postlink"
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setPostRange(work);
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return;
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} // end if
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else if (pos==0)
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throw new ValidationException(". at beginning of string");
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// Peel off the initial substring.
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String conf_or_topic = work.substring(0,pos);
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work.delete(0,pos+1);
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if (work.length()==0)
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{ // we had "conference." or "topic." (or perhaps "sig!conference.")
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if (signame==null)
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{ // it's either "conference." or "topic." - try topic first
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try
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{ // try it as a topic number first...
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setTopicNumber(conf_or_topic);
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} // end try
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catch (ValidationException ve)
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{ // it's not a topic number - try it as a conference name!
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setConferenceName(conf_or_topic);
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} // end catch
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} // end if
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else // it was "sig!conference."...save it off
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setConferenceName(conf_or_topic);
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return; // all done here...
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} // end if
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// Third Test: Dot Number Two
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pos = work.toString().indexOf('.');
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if (pos<0)
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{ // we had "conference.topic" or "topic.posts" (or perhaps "sig!conference.topic")
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if (signame==null)
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{ // we have "conference.topic" or "topic.posts" - have to determine this
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boolean is_topic = false; // what does "work" currently hold?
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try
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{ // try the "topic.posts" possibility first...
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setTopicNumber(conf_or_topic);
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} // end try
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catch (ValidationException ve)
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{ // nope, it's gotta be "conference.topic"
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setConferenceName(conf_or_topic);
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is_topic = true;
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} // end if
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// complete the parsing here
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if (is_topic)
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setTopicNumber(work.toString());
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else
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setPostRange(work);
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} // end if
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else
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{ // it's "sig!conference.topic"...set 'em up accordingly
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setConferenceName(conf_or_topic);
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setTopicNumber(work.toString());
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} // end else
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return; // all done
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} // end if
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else if (pos==0)
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throw new ValidationException(". at beginning of string");
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// We definitely have "conference.topic.something" (or "sig!conference.topic.sonething") now,
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// so save off the conference name and topic number.
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setConferenceName(conf_or_topic);
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setTopicNumber(work.substring(0,pos));
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work.delete(0,pos+1);
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if (work.length()==0)
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return; // we just had "conference.topic." or "sig!conference.topic.", which is valid
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setPostRange(work); // the rest must be the post range!
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} // end constructor
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/*--------------------------------------------------------------------------------
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* Internal functions
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*--------------------------------------------------------------------------------
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*/
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private static boolean isAllDigits(String str)
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{
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for (int i=0; i<str.length(); i++)
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{ // if any character is not a digit, bail out!
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if (!(Character.isDigit(str.charAt(i))))
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return false;
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} // end for
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return true;
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} // end isAllDigits
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private void setSIGName(String name) throws ValidationException
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{
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if (name.length()>MAX_SIG_LEN)
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throw new ValidationException("SIG alias is too long");
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if (!(IDUtils.isValidVeniceID(name)))
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throw new ValidationException("SIG alias is not a valid Venice identifier");
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signame = name;
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} // end setSIGName
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private void setConferenceName(String name) throws ValidationException
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{
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if (name.length()>MAX_CONF_LEN)
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throw new ValidationException("conference alias is too long");
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if (!(IDUtils.isValidVeniceID(name)))
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throw new ValidationException("conference alias is not a valid Venice identifier");
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confname = name;
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} // end setConferenceName
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private void setTopicNumber(String val) throws ValidationException
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{
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if (!isAllDigits(val))
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throw new ValidationException("invalid topic number reference");
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short temp_val;
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try
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{ // parse the temp value
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temp_val = Short.parseShort(val);
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} // end try
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catch (NumberFormatException nfe)
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{ // if there's a validation exception, it goes here
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throw new ValidationException("invalid topic number reference");
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} // end catch
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topicnum = temp_val;
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} // end setTopicNumber
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private void setPostRange(StringBuffer buf) throws ValidationException
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{
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int pos = buf.toString().indexOf('-');
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String temp = null;
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int temp_val = -1;
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if (pos>0)
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{ // we've got "temp-something" here...make sure "temp" is a valid post number
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temp = buf.substring(0,pos);
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buf.delete(0,pos+1);
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if (!isAllDigits(temp))
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throw new ValidationException("invalid post number reference");
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try
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{ // parse the temp value
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temp_val = Integer.parseInt(temp);
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} // end try
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catch (NumberFormatException nfe)
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{ // if there's a validation exception, it goes here
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throw new ValidationException("invalid post number reference");
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} // end catch
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if (buf.length()==0)
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{ // we just had "first-"...set it up
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first_post = temp_val;
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last_post = -1;
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return;
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} // end if
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} // end if
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else if (pos==0)
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throw new ValidationException("- at beginning of post range");
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// the remaining string must be all digits at this point
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if (!isAllDigits(buf.toString()))
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throw new ValidationException("invalid post number reference");
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try
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{ // parse the first value
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first_post = Integer.parseInt(buf.toString());
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} // end try
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catch (NumberFormatException nfe)
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{ // if there's a validation exception, it goes here
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throw new ValidationException("invalid post number reference");
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} // end catch
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if (temp!=null)
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{ // we converted a "temp_val" above - include it
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if (temp_val<first_post)
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{ // put the "temp_val" up front
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last_post = first_post;
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first_post = temp_val;
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} // end if
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else // reverse order - arrange them correctly
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last_post = temp_val;
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} // end if
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else // we have a "range" of one post
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last_post = first_post;
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} // end setPostRange
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/*--------------------------------------------------------------------------------
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* External operations
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*--------------------------------------------------------------------------------
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*/
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public String getSIG()
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{
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return signame;
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} // end getSIG
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public String getConference()
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{
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return confname;
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} // end getConference
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public short getTopic()
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{
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return topicnum;
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} // end getTopic
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public int getFirstPost()
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{
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return first_post;
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} // end getFirstPost
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public int getLastPost()
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{
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return last_post;
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} // end getFirstPost
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public boolean needDatabaseVerification()
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{
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return ((signame!=null) || (confname!=null));
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} // end needDatabaseVerification
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public void verifyNames(Connection conn) throws ValidationException
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{
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try
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{ // do the necessary database stuff
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Statement stmt = conn.createStatement();
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StringBuffer sql = new StringBuffer();
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ResultSet rs;
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if (signame!=null)
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{ // verify the SIG name against the database
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sql.append("SELECT sigid FROM sigs WHERE alias = '").append(SQLUtil.encodeString(signame));
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sql.append("';");
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rs = stmt.executeQuery(sql.toString());
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if (!(rs.next()))
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throw new ValidationException("SIG alias not found");
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sql.setLength(0);
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} // end if
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if (confname!=null)
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{ // verify the conference name against the database
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sql.append("SELECT confid FROM confalias WHERE alias = '").append(SQLUtil.encodeString(confname));
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sql.append("';");
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rs = stmt.executeQuery(sql.toString());
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if (!(rs.next()))
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throw new ValidationException("conference alias not found");
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} // end if
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} // end try
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catch (SQLException e)
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{ // database error verifying stuff!
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throw new ValidationException("unable to verify names in post link");
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} // end catch
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} // end verifyNames
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} // end class PostLinkDecoder
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