synapse/httpsend.pas

{==============================================================================|
| Project : Delphree - Synapse                                   | 002.003.000 |
|==============================================================================|
| Content: HTTP client                                                         |
|==============================================================================|
| The contents of this file are subject to the Mozilla Public License Ver. 1.1 |
| (the "License"); you may not use this file except in compliance with the     |
| License. You may obtain a copy of the License at http://www.mozilla.org/MPL/ |
|                                                                              |
| Software distributed under the License is distributed on an "AS IS" basis,   |
| WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for |
| the specific language governing rights and limitations under the License.    |
|==============================================================================|
| The Original Code is Synapse Delphi Library.                                 |
|==============================================================================|
| The Initial Developer of the Original Code is Lukas Gebauer (Czech Republic).|
| Portions created by Lukas Gebauer are Copyright (c) 1999,2000,2001.          |
| All Rights Reserved.                                                         |
|==============================================================================|
| Contributor(s):                                                              |
|==============================================================================|
| History: see HISTORY.HTM from distribution package                           |
|          (Found at URL: http://www.ararat.cz/synapse/)                       |
|==============================================================================}

{$WEAKPACKAGEUNIT ON}

unit HTTPSend;

interface

uses
  SysUtils, Classes,
  blcksock, SynaUtil, SynaCode;

const
  cHttpProtocol = '80';

type
  TTransferEncoding = (TE_UNKNOWN, TE_IDENTITY, TE_CHUNKED);

  THTTPSend = class(TObject)
  private
    FSock: TTCPBlockSocket;
    FTransferEncoding: TTransferEncoding;
    FAliveHost: string;
    FAlivePort: string;
    FHeaders: TStringList;
    FDocument: TMemoryStream;
    FMimeType: string;
    FProtocol: string;
    FKeepAlive: Boolean;
    FTimeout: Integer;
    FHTTPHost: string;
    FHTTPPort: string;
    FProxyHost: string;
    FProxyPort: string;
    FProxyUser: string;
    FProxyPass: string;
    FResultCode: Integer;
    FResultString: string;
    function ReadUnknown: Boolean;
    function ReadIdentity(Size: Integer): Boolean;
    function ReadChunked: Boolean;
  public
    constructor Create;
    destructor Destroy; override;
    procedure Clear;
    procedure DecodeStatus(const Value: string);
    function HTTPMethod(const Method, URL: string): Boolean;
  published
    property Headers: TStringList read FHeaders Write FHeaders;
    property Document: TMemoryStream read FDocument Write FDocument;
    property MimeType: string read FMimeType Write FMimeType;
    property Protocol: string read FProtocol Write FProtocol;
    property KeepAlive: Boolean read FKeepAlive Write FKeepAlive;
    property Timeout: Integer read FTimeout Write FTimeout;
    property HTTPHost: string read FHTTPHost;
    property HTTPPort: string read FHTTPPort;
    property ProxyHost: string read FProxyHost Write FProxyHost;
    property ProxyPort: string read FProxyPort Write FProxyPort;
    property ProxyUser: string read FProxyUser Write FProxyUser;
    property ProxyPass: string read FProxyPass Write FProxyPass;
    property ResultCode: Integer read FResultCode;
    property ResultString: string read FResultString;
    property Sock: TTCPBlockSocket read FSock;
  end;

function HttpGetText(const URL: string; const Response: TStrings): Boolean;
function HttpGetBinary(const URL: string; const Response: TStream): Boolean;
function HttpPostBinary(const URL: string; const Data: TStream): Boolean;
function HttpPostURL(const URL, URLData: string; const Data: TStream): Boolean;
function HttpPostFile(const URL, FieldName, FileName: string;
  const Data: TStream; const ResultData: TStringList): Boolean;

implementation

const
  CRLF = #13#10;

constructor THTTPSend.Create;
begin
  inherited Create;
  FHeaders := TStringList.Create;
  FDocument := TMemoryStream.Create;
  FSock := TTCPBlockSocket.Create;
  FSock.SizeRecvBuffer := 65536;
  FSock.SizeSendBuffer := 65536;
  FTimeout := 300000;
  FHTTPHost := cLocalhost;
  FHTTPPort := cHttpProtocol;
  FProxyHost := '';
  FProxyPort := '8080';
  FProxyUser := '';
  FProxyPass := '';
  FAliveHost := '';
  FAlivePort := '';
  FProtocol := '1.1';
  FKeepAlive := True;
  Clear;
end;

destructor THTTPSend.Destroy;
begin
  FSock.Free;
  FDocument.Free;
  FHeaders.Free;
  inherited Destroy;
end;

procedure THTTPSend.Clear;
begin
  FDocument.Clear;
  FHeaders.Clear;
  FMimeType := 'text/html';
end;

procedure THTTPSend.DecodeStatus(const Value: string);
var
  s, su: string;
begin
  s := SeparateRight(Value, ' ');
  su := SeparateLeft(s, ' ');
  FResultCode := StrToIntDef(su, 0);
  FResultString := SeparateRight(s, ' ');
  if FResultString = s then
    FResultString := '';
end;

function THTTPSend.HTTPMethod(const Method, URL: string): Boolean;
var
  Sending, Receiving: Boolean;
  status100: Boolean;
  status100error: string;
  ToClose: Boolean;
  Size: Integer;
  Prot, User, Pass, Host, Port, Path, Para, URI: string;
  n: Integer;
  s, su: string;
begin
  {initial values}
  Result := False;
  FResultCode := 500;
  FResultString := '';

  URI := ParseURL(URL, Prot, User, Pass, Host, Port, Path, Para);
  Sending := Document.Size > 0;
  {Headers for Sending data}
  status100 := Sending and (FProtocol = '1.1');
  if status100 then
    FHeaders.Insert(0, 'Expect: 100-continue');
  if Sending then
  begin
    FHeaders.Insert(0, 'Content-Length: ' + IntToStr(FDocument.Size));
    if FMimeType <> '' then
      FHeaders.Insert(0, 'Content-Type: ' + FMimeType);
  end;
  { setting KeepAlives }
  if not FKeepAlive then
    FHeaders.Insert(0, 'Connection: close');
  { set target servers/proxy, authorisations, etc... }
  if User <> '' then
    FHeaders.Insert(0, 'Authorization: Basic ' + EncodeBase64(user + ':' + pass));
  if (FProxyHost <> '') and (FProxyUser <> '') then
    FHeaders.Insert(0, 'Proxy-Authorization: Basic ' +
      EncodeBase64(FProxyUser + ':' + FProxyPass));
  if Port<>'80' then
     FHeaders.Insert(0, 'Host: ' + Host + ':' + Port)
  else
     FHeaders.Insert(0, 'Host: ' + Host);
  if FProxyHost <> '' then
    URI := Prot + '://' + Host + ':' + Port + URI;
  if URI = '/*' then
    URI := '*';
  if FProtocol = '0.9' then
    FHeaders.Insert(0, UpperCase(Method) + ' ' + URI)
  else
    FHeaders.Insert(0, UpperCase(Method) + ' ' + URI + ' HTTP/' + FProtocol);
  if FProxyHost = '' then
  begin
    FHTTPHost := Host;
    FHTTPPort := Port;
  end
  else
  begin
    FHTTPHost := FProxyHost;
    FHTTPPort := FProxyPort;
  end;
  if FHeaders[FHeaders.Count - 1] <> '' then
    FHeaders.Add('');

  { connect }
  if (FAliveHost <> FHTTPHost) or (FAlivePort <> FHTTPPort) then
  begin
    FSock.CloseSocket;
    FSock.CreateSocket;
    FSock.Connect(FHTTPHost, FHTTPPort);
    if FSock.LastError <> 0 then
      Exit;
    FAliveHost := FHTTPHost;
    FAlivePort := FHTTPPort;
  end
  else
  begin
    if FSock.CanRead(0) then
    begin
      FSock.CloseSocket;
      FSock.CreateSocket;
      FSock.Connect(FHTTPHost, FHTTPPort);
      if FSock.LastError <> 0 then
        Exit;
    end;
  end;

  { send Headers }
  FSock.SendString(Headers[0] + CRLF);
  if FProtocol <> '0.9' then
    for n := 1 to FHeaders.Count - 1 do
      FSock.SendString(FHeaders[n] + CRLF);
  if FSock.LastError <> 0 then
    Exit;

  { reading Status }
  Status100Error := '';
  if status100 then
  begin
    repeat
      s := FSock.RecvString(FTimeout);
      if s <> '' then
        Break;
    until FSock.LastError <> 0;
    DecodeStatus(s);
    if (FResultCode >= 100) and (FResultCode < 200) then
      repeat
        s := FSock.recvstring(FTimeout);
        if s = '' then
          Break;
      until FSock.LastError <> 0
    else
    begin
      Sending := False;
      Status100Error := s;
    end;
  end;

  { send document }
  if Sending then
  begin
    FSock.SendBuffer(FDocument.Memory, FDocument.Size);
    if FSock.LastError <> 0 then
      Exit;
  end;

  Clear;
  Size := -1;
  FTransferEncoding := TE_UNKNOWN;

  { read status }
  if Status100Error = '' then
  begin
    repeat
      s := FSock.RecvString(FTimeout);
      if s <> '' then
        Break;
    until FSock.LastError <> 0;
    if Pos('HTTP/', UpperCase(s)) = 1 then
    begin
      FHeaders.Add(s);
      DecodeStatus(s);
    end
    else
    begin
      { old HTTP 0.9 and some buggy servers not send result }
      s := s + CRLF;
      FDocument.Write(Pointer(s)^, Length(s));
      FResultCode := 0;
    end;
  end
  else
    FHeaders.Add(Status100Error);

  { if need receive hedaers, receive and parse it }
  ToClose := FProtocol <> '1.1';
  if FHeaders.Count > 0 then
    repeat
      s := FSock.RecvString(FTimeout);
      FHeaders.Add(s);
      if s = '' then
        Break;
      su := UpperCase(s);
      if Pos('CONTENT-LENGTH:', su) = 1 then
      begin
        Size := StrToIntDef(SeparateRight(s, ' '), -1);
        if Size <> -1 then
          FTransferEncoding := TE_IDENTITY;
      end;
      if Pos('CONTENT-TYPE:', su) = 1 then
        FMimeType := SeparateRight(s, ' ');
      if Pos('TRANSFER-ENCODING:', su) = 1 then
      begin
        s := SeparateRight(su, ' ');
        if Pos('CHUNKED', s) > 0 then
          FTransferEncoding := TE_CHUNKED;
      end;
      if Pos('CONNECTION: CLOSE', su) = 1 then
        ToClose := True;
    until FSock.LastError <> 0;

  {if need receive response body, read it}
  Receiving := Method <> 'HEAD';
  Receiving := Receiving and (FResultCode <> 204);
  Receiving := Receiving and (FResultCode <> 304);
  if Receiving then
    case FTransferEncoding of
      TE_UNKNOWN:
        ReadUnknown;
      TE_IDENTITY:
        ReadIdentity(Size);
      TE_CHUNKED:
        ReadChunked;
    end;

  FDocument.Seek(0, soFromBeginning);
  Result := True;
  if ToClose then
  begin
    FSock.CloseSocket;
    FAliveHost := '';
    FAlivePort := '';
  end;
end;

function THTTPSend.ReadUnknown: Boolean;
var
  s: string;
begin
  repeat
    s := FSock.RecvPacket(FTimeout);
    if FSock.LastError = 0 then
      FDocument.Write(Pointer(s)^, Length(s));
  until FSock.LastError <> 0;
  Result := True;
end;

function THTTPSend.ReadIdentity(Size: Integer): Boolean;
var
  mem: TMemoryStream;
begin
  mem := TMemoryStream.Create;
  try
    mem.SetSize(Size);
    FSock.RecvBufferEx(mem.Memory, Size, FTimeout);
    Result := FSock.LastError = 0;
    FDocument.CopyFrom(mem, 0);
  finally
    mem.Free;
  end;
end;

function THTTPSend.ReadChunked: Boolean;
var
  s: string;
  Size: Integer;
begin
  repeat
    repeat
      s := FSock.RecvString(FTimeout);
    until s <> '';
    if FSock.LastError <> 0 then
      Break;
    s := SeparateLeft(s, ' ');
    Size := StrToIntDef('$' + s, 0);
    if Size = 0 then
      Break;
    ReadIdentity(Size);
  until False;
  Result := FSock.LastError = 0;
end;

{==============================================================================}

function HttpGetText(const URL: string; const Response: TStrings): Boolean;
var
  HTTP: THTTPSend;
begin
  HTTP := THTTPSend.Create;
  try
    Result := HTTP.HTTPMethod('GET', URL);
    Response.LoadFromStream(HTTP.Document);
  finally
    HTTP.Free;
  end;
end;

function HttpGetBinary(const URL: string; const Response: TStream): Boolean;
var
  HTTP: THTTPSend;
begin
  HTTP := THTTPSend.Create;
  try
    Result := HTTP.HTTPMethod('GET', URL);
    Response.Seek(0, soFromBeginning);
    Response.CopyFrom(HTTP.Document, 0);
  finally
    HTTP.Free;
  end;
end;

function HttpPostBinary(const URL: string; const Data: TStream): Boolean;
var
  HTTP: THTTPSend;
begin
  HTTP := THTTPSend.Create;
  try
    HTTP.Document.CopyFrom(Data, 0);
    HTTP.MimeType := 'Application/octet-stream';
    Result := HTTP.HTTPMethod('POST', URL);
    Data.Seek(0, soFromBeginning);
    Data.CopyFrom(HTTP.Document, 0);
  finally
    HTTP.Free;
  end;
end;

function HttpPostURL(const URL, URLData: string; const Data: TStream): Boolean;
var
  HTTP: THTTPSend;
begin
  HTTP := THTTPSend.Create;
  try
    HTTP.Document.Write(Pointer(URLData)^, Length(URLData));
    HTTP.MimeType := 'application/x-url-encoded';
    Result := HTTP.HTTPMethod('POST', URL);
    Data.CopyFrom(HTTP.Document, 0);
  finally
    HTTP.Free;
  end;
end;

function HttpPostFile(const URL, FieldName, FileName: string;
  const Data: TStream; const ResultData: TStringList): Boolean;
const
  CRLF = #$0D + #$0A;
var
  HTTP: THTTPSend;
  Bound, s: string;
begin
  Bound := '--' + IntToHex(Random(MaxInt), 8) + '_Synapse_boundary';
  HTTP := THTTPSend.Create;
  try
    s := Bound + CRLF;
    s := s + 'content-disposition: form-data; name="' + FieldName + '";';
    s := s + ' filename="' + FileName +'"' + CRLF;
    s := s + 'Content-Type: Application/octet-string' + CRLF + CRLF;
    HTTP.Document.Write(Pointer(s)^, Length(s));
    HTTP.Document.CopyFrom(Data, 0);
    s := CRLF + Bound + '--' + CRLF;
    HTTP.Document.Write(Pointer(s)^, Length(s));
    HTTP.MimeType := 'multipart/form-data, boundary=' + Bound;
    Result := HTTP.HTTPMethod('POST', URL);
    ResultData.LoadFromStream(HTTP.Document);
  finally
    HTTP.Free;
  end;
end;

end.