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https://github.com/reactos/reactos.git
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504 lines
12 KiB
C#
504 lines
12 KiB
C#
using System;
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namespace TechBot.IRCLibrary
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{
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/*
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<message> ::= [':' <prefix> <SPACE> ] <command> <params> <crlf>
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<prefix> ::= <servername> | <nick> [ '!' <user> ] [ '@' <host> ]
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<command> ::= <letter> { <letter> } | <number> <number> <number>
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<SPACE> ::= ' ' { ' ' }
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<params> ::= <SPACE> [ ':' <trailing> | <middle> <params> ]
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<middle> ::= <Any *non-empty* sequence of octets not including SPACE
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or NUL or CR or LF, the first of which may not be ':'>
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<trailing> ::= <Any, possibly *empty*, sequence of octets not including
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NUL or CR or LF>
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<crlf> ::= CR LF
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NOTES:
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1) <SPACE> is consists only of SPACE character(s) (0x20).
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Specially notice that TABULATION, and all other control
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characters are considered NON-WHITE-SPACE.
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2) After extracting the parameter list, all parameters are equal,
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whether matched by <middle> or <trailing>. <Trailing> is just
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a syntactic trick to allow SPACE within parameter.
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3) The fact that CR and LF cannot appear in parameter strings is
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just artifact of the message framing. This might change later.
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4) The NUL character is not special in message framing, and
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basically could end up inside a parameter, but as it would
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cause extra complexities in normal C string handling. Therefore
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NUL is not allowed within messages.
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5) The last parameter may be an empty string.
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6) Use of the extended prefix (['!' <user> ] ['@' <host> ]) must
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not be used in server to server communications and is only
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intended for server to client messages in order to provide
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clients with more useful information about who a message is
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from without the need for additional queries.
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*/
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/*
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NOTICE AUTH :*** Looking up your hostname
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NOTICE AUTH :*** Checking Ident
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NOTICE AUTH :*** Found your hostname
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NOTICE AUTH :*** No ident response
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*/
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/// <summary>
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/// IRC message.
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/// </summary>
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public class IrcMessage
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{
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#region Private fields
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private string line;
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private string prefix;
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private string prefixServername;
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private string prefixNickname;
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private string prefixUser;
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private string prefixHost;
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private string command;
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private string parameters;
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#endregion
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/// <summary>
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/// Line of text that is to be parsed as an IRC message.
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/// </summary>
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public string Line
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{
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get
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{
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return line;
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}
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}
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/// <summary>
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/// Does the message have a prefix?
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/// </summary>
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public bool HasPrefix
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{
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get
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{
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return prefix != null;
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}
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}
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/// <summary>
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/// Prefix or null if none exists.
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/// </summary>
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public string Prefix
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{
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get
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{
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return prefix;
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}
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}
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/// <summary>
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/// Servername part of prefix or null if no prefix or servername exists.
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/// </summary>
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public string PrefixServername
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{
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get
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{
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return prefixServername;
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}
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}
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/// <summary>
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/// Nickname part of prefix or null if no prefix or nick exists.
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/// </summary>
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public string PrefixNickname
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{
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get
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{
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return prefixNickname;
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}
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}
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/// <summary>
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/// User part of (extended) prefix or null if no (extended) prefix exists.
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/// </summary>
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public string PrefixUser
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{
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get
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{
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return prefixUser;
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}
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}
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/// <summary>
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/// Host part of (extended) prefix or null if no (extended) prefix exists.
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/// </summary>
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public string PrefixHost
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{
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get
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{
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return prefixHost;
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}
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}
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/// <summary>
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/// Command part of message.
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/// </summary>
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public string Command
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{
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get
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{
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return command;
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}
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}
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/// <summary>
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/// Is command numeric?
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/// </summary>
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public bool IsCommandNumeric
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{
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get
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{
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if (command == null || command.Length != 3)
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{
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return false;
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}
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try
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{
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Int32.Parse(command);
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return true;
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}
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catch (Exception)
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{
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return false;
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}
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}
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}
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/// <summary>
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/// Command part of message as text.
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/// </summary>
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public string CommandText
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{
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get
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{
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return command;
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}
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}
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/// <summary>
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/// Command part of message as a number.
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/// </summary>
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/// <exception cref="InvalidOperationException">Thrown if IsCommandNumeric returns false.</exception>
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public int CommandNumber
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{
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get
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{
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if (IsCommandNumeric)
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{
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return Int32.Parse(command);
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}
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else
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{
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throw new InvalidOperationException();
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}
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}
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}
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/// <summary>
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/// Parameters part of message.
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/// </summary>
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public string Parameters
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{
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get
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{
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return parameters;
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}
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}
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="line">Line of text that is to be parsed as an IRC message.</param>
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public IrcMessage(string line)
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{
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/*
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* <message> ::= [':' <prefix> <SPACE> ] <command> <params> <crlf>
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* <prefix> ::= <servername> | <nick> [ '!' <user> ] [ '@' <host> ]
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* :Oslo1.NO.EU.undernet.org 461 MYNICK USER :Not enough parameters
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*/
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try
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{
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this.line = line;
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int i = 0;
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#region Prefix
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if (line[i].Equals(':'))
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{
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i++;
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prefix = "";
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/* This message has a prefix */
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string s = "";
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while (i < line.Length && line[i] != ' ' && line[i] != '!' && line[i] != '@')
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{
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s += line[i++];
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}
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if (IsValidIrcNickname(s))
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{
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prefixNickname = s;
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prefix += prefixNickname;
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if (line[i] == '!')
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{
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/* This message has an extended prefix */
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i++;
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s = "";
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while (i < line.Length && line[i] != ' ' && line[i] != '@')
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{
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s += line[i];
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i++;
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}
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prefixUser = s;
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prefix += "!" + prefixUser;
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}
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if (line[i] == '@')
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{
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/* This message has a host prefix */
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s = "";
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do
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{
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s += line[++i];
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}
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while (i < line.Length && line[i] != ' ');
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prefixHost = s;
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prefix += "@" + prefixHost;
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}
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}
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else /* Assume it is a servername */
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{
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prefixServername = s;
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prefix += prefixServername;
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}
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/* Skip spaces */
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while (i < line.Length && line[i] == ' ')
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{
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i++;
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}
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}
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else
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{
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prefix = null;
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}
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#endregion
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#region Command
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if (Char.IsDigit(line[i]))
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{
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if (!Char.IsDigit(line, i + 1) || !Char.IsDigit(line, i + 2))
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{
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throw new Exception();
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}
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command = String.Format("{0}{1}{2}", line[i++], line[i++], line[i++]);
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}
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else
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{
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command = "";
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while (i < line.Length && Char.IsLetter(line[i]))
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{
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command += line[i];
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i++;
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}
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}
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#endregion
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#region Parameters
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while (true)
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{
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/* Skip spaces */
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while (i < line.Length && line[i] == ' ')
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{
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i++;
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}
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if (i < line.Length && line[i].Equals(':'))
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{
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i++;
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/* Trailing */
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while (i < line.Length && line[i] != ' ' && line[i] != '\r' && line[i] != '\n' && line[i] != 0)
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{
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if (parameters == null)
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{
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parameters = "";
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}
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parameters += line[i];
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i++;
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}
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}
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else
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{
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/* Middle */
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while (i < line.Length && line[i] != '\r' && line[i] != '\n' && line[i] != 0)
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{
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if (parameters == null)
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{
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parameters = "";
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}
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parameters += line[i];
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i++;
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}
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}
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if (i >= line.Length)
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{
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break;
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}
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}
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#endregion
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}
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catch (Exception ex)
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{
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throw new MalformedMessageException("The message is malformed.", ex);
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}
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}
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="prefixServername"></param>
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/// <param name="prefixNickname"></param>
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/// <param name="prefixUser"></param>
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/// <param name="prefixHost"></param>
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/// <param name="command"></param>
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/// <param name="parameters"></param>
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public IrcMessage(string prefixServername,
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string prefixNickname,
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string prefixUser,
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string prefixHost,
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string command,
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string parameters)
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{
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throw new NotImplementedException();
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}
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="command">IRC command.</param>
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/// <param name="parameters">IRC command parameters. May be null if there are no parameters.</param>
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public IrcMessage(string command,
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string parameters)
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{
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if (command == null || !IsValidIrcCommand(command))
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{
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throw new ArgumentException("Command is not a valid IRC command.", "command");
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}
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/* An IRC message must not be longer than 512 characters (including terminating CRLF) */
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int parametersLength = (parameters != null) ? 1 + parameters.Length : 0;
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if (command.Length + parametersLength > 510)
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{
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throw new MalformedMessageException("IRC message cannot be longer than 512 characters.");
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}
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this.command = command;
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this.parameters = parameters;
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if (parameters != null)
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{
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this.line = String.Format("{0} {1}\r\n", command, parameters);
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}
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else
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{
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this.line = String.Format("{0}\r\n", command);
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}
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}
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/// <summary>
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/// Returns wether a string of text is a valid IRC command.
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/// </summary>
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/// <param name="command">The IRC command.</param>
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/// <returns>True, if <c ref="command">command</c> is a valid IRC command, false if not.</returns>
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private static bool IsValidIrcCommand(string command)
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{
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foreach (char c in command)
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{
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if (!Char.IsLetter(c))
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{
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return false;
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}
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}
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return true;
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}
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private const string IrcSpecial = @"-[]\`^{}";
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private const string IrcSpecialNonSpecs = @"_|";
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/// <summary>
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/// Returns wether a character is an IRC special character.
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/// </summary>
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/// <param name="c">Character to test.</param>
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/// <returns>True if the character is an IRC special character, false if not.</returns>
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private static bool IsSpecial(char c)
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{
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foreach (char validCharacter in IrcSpecial)
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{
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if (c.Equals(validCharacter))
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{
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return true;
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}
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}
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foreach (char validCharacter in IrcSpecialNonSpecs)
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{
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if (c.Equals(validCharacter))
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{
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return true;
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}
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}
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return false;
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}
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/// <summary>
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/// Returns wether a string of text is a valid IRC nickname.
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/// </summary>
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/// <param name="nickname">The IRC nickname.</param>
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/// <returns>True, if <c ref="nickname">nickname</c> is a valid IRC nickname, false if not.</returns>
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private static bool IsValidIrcNickname(string nickname)
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{
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/*
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* <nick> ::= <letter> { <letter> | <number> | <special> }
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* <letter> ::= 'a' ... 'z' | 'A' ... 'Z'
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* <number> ::= '0' ... '9'
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* <special> ::= '-' | '[' | ']' | '\' | '`' | '^' | '{' | '}'
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*/
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/* An IRC nicknmame must be 1 - 9 characters in length. We don't care so much if it is larger */
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if ((nickname.Length < 1) || (nickname.Length > 30))
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{
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return false;
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}
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/* First character must be a letter. */
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if (!Char.IsLetter(nickname[0]))
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{
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return false;
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}
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/* Check the other valid characters for validity. */
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foreach (char c in nickname)
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{
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if (!Char.IsLetter(c) && !Char.IsDigit(c) && !IsSpecial(c))
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{
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return false;
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}
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}
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return true;
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}
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/// <summary>
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/// Write contents to a string.
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/// </summary>
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/// <returns>Contents as a string.</returns>
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public override string ToString()
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{
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return String.Format("Line({0})Prefix({1})Command({2})Parameters({3})",
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line, prefix != null ? prefix : "(null)",
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command != null ? command : "(null)",
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parameters != null ? parameters : "(null)");
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}
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}
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}
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