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{==============================================================================|
| Project : Ararat Synapse | 001.005.003 |
|==============================================================================|
| Content: NNTP client |
|==============================================================================|
| Copyright (c)1999-2011, Lukas Gebauer |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met: |
| |
| Redistributions of source code must retain the above copyright notice, this |
| list of conditions and the following disclaimer. |
| |
| Redistributions in binary form must reproduce the above copyright notice, |
| this list of conditions and the following disclaimer in the documentation |
| and/or other materials provided with the distribution. |
| |
| Neither the name of Lukas Gebauer nor the names of its contributors may |
| be used to endorse or promote products derived from this software without |
| specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR |
| ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| DAMAGE. |
|==============================================================================|
| The Initial Developer of the Original Code is Lukas Gebauer (Czech Republic).|
| Portions created by Lukas Gebauer are Copyright (c) 1999-2011. |
| All Rights Reserved. |
|==============================================================================|
| Contributor(s): |
|==============================================================================|
| History: see HISTORY.HTM from distribution package |
| (Found at URL: http://www.ararat.cz/synapse/) |
|==============================================================================}
{:@abstract(NNTP client)
NNTP (network news transfer protocol)
Used RFC: RFC-977, RFC-2980
}
{$IFDEF FPC}
{$MODE DELPHI}
{$ENDIF}
{$H+}
{$IFDEF UNICODE}
{$WARN IMPLICIT_STRING_CAST OFF}
{$WARN IMPLICIT_STRING_CAST_LOSS OFF}
{$WARN SUSPICIOUS_TYPECAST OFF}
{$ENDIF}
unit nntpsend;
interface
uses
SysUtils, Classes,
blcksock, synautil;
const
cNNTPProtocol = '119';
type
{:abstract(Implementation of Network News Transfer Protocol.
Note: Are you missing properties for setting Username and Password? Look to
parent @link(TSynaClient) object!
Are you missing properties for specify server address and port? Look to
parent @link(TSynaClient) too!}
TNNTPSend = class(TSynaClient)
private
FSock: TTCPBlockSocket;
FResultCode: Integer;
FResultString: string;
FData: TStringList;
FDataToSend: TStringList;
FAutoTLS: Boolean;
FFullSSL: Boolean;
FNNTPcap: TStringList;
function ReadResult: Integer;
function ReadData: boolean;
function SendData: boolean;
function Connect: Boolean;
public
constructor Create;
destructor Destroy; override;
{:Connects to NNTP server and begin session.}
function Login: Boolean;
{:Logout from NNTP server and terminate session.}
function Logout: Boolean;
{:By this you can call any NNTP command.}
function DoCommand(const Command: string): boolean;
{:by this you can call any NNTP command. This variant is used for commands
for download information from server.}
function DoCommandRead(const Command: string): boolean;
{:by this you can call any NNTP command. This variant is used for commands
for upload information to server.}
function DoCommandWrite(const Command: string): boolean;
{:Download full message to @link(data) property. Value can be number of
message or message-id (in brackets).}
function GetArticle(const Value: string): Boolean;
{:Download only body of message to @link(data) property. Value can be number
of message or message-id (in brackets).}
function GetBody(const Value: string): Boolean;
{:Download only headers of message to @link(data) property. Value can be
number of message or message-id (in brackets).}
function GetHead(const Value: string): Boolean;
{:Get message status. Value can be number of message or message-id
(in brackets).}
function GetStat(const Value: string): Boolean;
{:Select given group.}
function SelectGroup(const Value: string): Boolean;
{:Tell to server 'I have mesage with given message-ID.' If server need this
message, message is uploaded to server.}
function IHave(const MessID: string): Boolean;
{:Move message pointer to last item in group.}
function GotoLast: Boolean;
{:Move message pointer to next item in group.}
function GotoNext: Boolean;
{:Download to @link(data) property list of all groups on NNTP server.}
function ListGroups: Boolean;
{:Download to @link(data) property list of all groups created after given time.}
function ListNewGroups(Since: TDateTime): Boolean;
{:Download to @link(data) property list of message-ids in given group since
given time.}
function NewArticles(const Group: string; Since: TDateTime): Boolean;
{:Upload new article to server. (for new messages by you)}
function PostArticle: Boolean;
{:Tells to remote NNTP server 'I am not NNTP client, but I am another NNTP
server'.}
function SwitchToSlave: Boolean;
{:Call NNTP XOVER command.}
function Xover(xoStart, xoEnd: string): boolean;
{:Call STARTTLS command for upgrade connection to SSL/TLS mode.}
function StartTLS: Boolean;
{:Try to find given capability in extension list. This list is getted after
successful login to NNTP server. If extension capability is not found,
then return is empty string.}
function FindCap(const Value: string): string;
{:Try get list of server extensions. List is returned in @link(data) property.}
function ListExtensions: Boolean;
published
{:Result code number of last operation.}
property ResultCode: Integer read FResultCode;
{:String description of last result code from NNTP server.}
property ResultString: string read FResultString;
{:Readed data. (message, etc.)}
property Data: TStringList read FData;
{:If is set to @true, then upgrade to SSL/TLS mode after login if remote
server support it.}
property AutoTLS: Boolean read FAutoTLS Write FAutoTLS;
{:SSL/TLS mode is used from first contact to server. Servers with full
SSL/TLS mode usualy using non-standard TCP port!}
property FullSSL: Boolean read FFullSSL Write FFullSSL;
{:Socket object used for TCP/IP operation. Good for seting OnStatus hook, etc.}
property Sock: TTCPBlockSocket read FSock;
end;
implementation
constructor TNNTPSend.Create;
begin
inherited Create;
FSock := TTCPBlockSocket.Create;
FSock.Owner := self;
FData := TStringList.Create;
FDataToSend := TStringList.Create;
FNNTPcap := TStringList.Create;
FSock.ConvertLineEnd := True;
FTimeout := 60000;
FTargetPort := cNNTPProtocol;
FAutoTLS := False;
FFullSSL := False;
end;
destructor TNNTPSend.Destroy;
begin
FSock.Free;
FDataToSend.Free;
FData.Free;
FNNTPcap.Free;
inherited Destroy;
end;
function TNNTPSend.ReadResult: Integer;
var
s: string;
begin
Result := 0;
FData.Clear;
s := FSock.RecvString(FTimeout);
FResultString := Copy(s, 5, Length(s) - 4);
if FSock.LastError <> 0 then
Exit;
if Length(s) >= 3 then
Result := StrToIntDef(Copy(s, 1, 3), 0);
FResultCode := Result;
end;
function TNNTPSend.ReadData: boolean;
var
s: string;
begin
repeat
s := FSock.RecvString(FTimeout);
if s = '.' then
break;
if (s <> '') and (s[1] = '.') then
s := Copy(s, 2, Length(s) - 1);
FData.Add(s);
until FSock.LastError <> 0;
Result := FSock.LastError = 0;
end;
function TNNTPSend.SendData: boolean;
var
s: string;
n: integer;
begin
for n := 0 to FDataToSend.Count - 1 do
begin
s := FDataToSend[n];
if (s <> '') and (s[1] = '.') then
s := s + '.';
FSock.SendString(s + CRLF);
if FSock.LastError <> 0 then
break;
end;
if FDataToSend.Count = 0 then
FSock.SendString(CRLF);
if FSock.LastError = 0 then
FSock.SendString('.' + CRLF);
FDataToSend.Clear;
Result := FSock.LastError = 0;
end;
function TNNTPSend.Connect: Boolean;
begin
FSock.CloseSocket;
FSock.Bind(FIPInterface, cAnyPort);
if FSock.LastError = 0 then
FSock.Connect(FTargetHost, FTargetPort);
if FSock.LastError = 0 then
if FFullSSL then
FSock.SSLDoConnect;
Result := FSock.LastError = 0;
end;
function TNNTPSend.Login: Boolean;
begin
Result := False;
FNNTPcap.Clear;
if not Connect then
Exit;
Result := (ReadResult div 100) = 2;
if Result then
begin
ListExtensions;
FNNTPcap.Assign(Fdata);
if (not FullSSL) and FAutoTLS and (FindCap('STARTTLS') <> '') then
Result := StartTLS;
end;
if (FUsername <> '') and Result then
begin
FSock.SendString('AUTHINFO USER ' + FUsername + CRLF);
if (ReadResult div 100) = 3 then
begin
FSock.SendString('AUTHINFO PASS ' + FPassword + CRLF);
Result := (ReadResult div 100) = 2;
end;
end;
end;
function TNNTPSend.Logout: Boolean;
begin
FSock.SendString('QUIT' + CRLF);
Result := (ReadResult div 100) = 2;
FSock.CloseSocket;
end;
function TNNTPSend.DoCommand(const Command: string): Boolean;
begin
FSock.SendString(Command + CRLF);
Result := (ReadResult div 100) = 2;
Result := Result and (FSock.LastError = 0);
end;
function TNNTPSend.DoCommandRead(const Command: string): Boolean;
begin
Result := DoCommand(Command);
if Result then
begin
Result := ReadData;
Result := Result and (FSock.LastError = 0);
end;
end;
function TNNTPSend.DoCommandWrite(const Command: string): Boolean;
var
x: integer;
begin
FDataToSend.Assign(FData);
FSock.SendString(Command + CRLF);
x := (ReadResult div 100);
if x = 3 then
begin
SendData;
x := (ReadResult div 100);
end;
Result := x = 2;
Result := Result and (FSock.LastError = 0);
end;
function TNNTPSend.GetArticle(const Value: string): Boolean;
var
s: string;
begin
s := 'ARTICLE';
if Value <> '' then
s := s + ' ' + Value;
Result := DoCommandRead(s);
end;
function TNNTPSend.GetBody(const Value: string): Boolean;
var
s: string;
begin
s := 'BODY';
if Value <> '' then
s := s + ' ' + Value;
Result := DoCommandRead(s);
end;
function TNNTPSend.GetHead(const Value: string): Boolean;
var
s: string;
begin
s := 'HEAD';
if Value <> '' then
s := s + ' ' + Value;
Result := DoCommandRead(s);
end;
function TNNTPSend.GetStat(const Value: string): Boolean;
var
s: string;
begin
s := 'STAT';
if Value <> '' then
s := s + ' ' + Value;
Result := DoCommand(s);
end;
function TNNTPSend.SelectGroup(const Value: string): Boolean;
begin
Result := DoCommand('GROUP ' + Value);
end;
function TNNTPSend.IHave(const MessID: string): Boolean;
begin
Result := DoCommandWrite('IHAVE ' + MessID);
end;
function TNNTPSend.GotoLast: Boolean;
begin
Result := DoCommand('LAST');
end;
function TNNTPSend.GotoNext: Boolean;
begin
Result := DoCommand('NEXT');
end;
function TNNTPSend.ListGroups: Boolean;
begin
Result := DoCommandRead('LIST');
end;
function TNNTPSend.ListNewGroups(Since: TDateTime): Boolean;
begin
Result := DoCommandRead('NEWGROUPS ' + SimpleDateTime(Since) + ' GMT');
end;
function TNNTPSend.NewArticles(const Group: string; Since: TDateTime): Boolean;
begin
Result := DoCommandRead('NEWNEWS ' + Group + ' ' + SimpleDateTime(Since) + ' GMT');
end;
function TNNTPSend.PostArticle: Boolean;
begin
Result := DoCommandWrite('POST');
end;
function TNNTPSend.SwitchToSlave: Boolean;
begin
Result := DoCommand('SLAVE');
end;
function TNNTPSend.Xover(xoStart, xoEnd: string): Boolean;
var
s: string;
begin
s := 'XOVER ' + xoStart;
if xoEnd <> xoStart then
s := s + '-' + xoEnd;
Result := DoCommandRead(s);
end;
function TNNTPSend.StartTLS: Boolean;
begin
Result := False;
if FindCap('STARTTLS') <> '' then
begin
if DoCommand('STARTTLS') then
begin
Fsock.SSLDoConnect;
Result := FSock.LastError = 0;
end;
end;
end;
function TNNTPSend.ListExtensions: Boolean;
begin
Result := DoCommandRead('LIST EXTENSIONS');
end;
function TNNTPSend.FindCap(const Value: string): string;
var
n: Integer;
s: string;
begin
s := UpperCase(Value);
Result := '';
for n := 0 to FNNTPcap.Count - 1 do
if Pos(s, UpperCase(FNNTPcap[n])) = 1 then
begin
Result := FNNTPcap[n];
Break;
end;
end;
{==============================================================================}
end.