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{
This file is part of the Free Component Library (FCL)
Copyright (c) 1999-2000 by Michael Van Canneyt and Florian Klaempfl
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit ezcgi;
{$mode delphi}
{$H+ }
interface
uses classes, strings, sysutils;
const
hexTable = '0123456789ABCDEF';
type
ECGIException = class(Exception);
TEZcgi = class(TObject)
private
{ Private declarations }
FVariables : TStringList;
FName : String;
FEmail : String;
FQueryString : String;
{ Token variables }
aString : String;
aSepStr : String;
aPos : Integer;
aLenStr : Integer;
aLenSep : Integer;
procedure InitToken(aStr, aSep : String);
function NextToken(var aToken : String; var aSepChar : Char) : Boolean;
procedure GetQueryItems;
procedure ProcessRequest;
procedure LoadEnvVariables;
function GetVal(Index : String) : String;
function GetName(Index : Integer) : String;
function GetVariable(Index : Integer) : String;
function GetVarCount : Integer;
procedure ReadPostQuery;
procedure ReadGetQuery;
protected
{ Protected declarations }
procedure OutputError(errorMessage : String);
public
{ Public declarations }
constructor Create;
destructor Destroy; override;
procedure Run;
procedure WriteContent(ctype : String);
procedure PutLine(sOut : String);
function GetValue(Index : String; defaultValue : String) : String;
procedure DoPost; virtual;
procedure DoGet; virtual;
property Values[Index : String] : String read GetVal;
property Names[Index : Integer] : String read GetName;
property Variables[Index : Integer] : String read GetVariable;
property VariableCount : Integer read GetVarCount;
property Name : String read FName write FName;
property Email : String read FEmail write FEmail;
end;
implementation
{ *********** Public Methods *************** }
constructor TEZcgi.Create;
begin
FName := 'No name available';
FEmail := 'Email address unavailable';
FVariables := TStringList.Create;
LoadEnvVariables;
end;
destructor TEZcgi.Destroy;
begin
FVariables.Free;
end;
procedure TEZcgi.Run;
begin
ProcessRequest;
end;
procedure TEZcgi.DoPost;
begin
// Must be overriden by child class
end;
procedure TEZcgi.DoGet;
begin
// Must be overriden by child class
end;
procedure TEZcgi.WriteContent(ctype : String);
begin
writeln('Content-Type: ',ctype);
writeln;
end;
procedure TEZcgi.PutLine(sOut : String);
begin
writeln(sOut);
end;
function TEZcgi.GetValue(Index, defaultValue : String) : String;
begin
result := GetVal(Index);
if result = '' then
result := defaultValue;
end;
{ *********** Private Methods *************** }
procedure TEZcgi.LoadEnvVariables;
procedure GetEData(variable : String);
var
tempStr : String;
begin
// This is a system dependent call !!
tempStr := GetEnvironmentVariable(variable);
if tempStr <> '' then
FVariables.Add(variable + '=' + tempStr);
end;
begin
{ Standard CGI Environment Variables }
GetEData('AUTH_TYPE');
GetEData('CONTENT_LENGTH');
GetEData('CONTENT_TYPE');
GetEData('GATEWAY_INTERFACE');
GetEData('PATH_INFO');
GetEData('PATH_TRANSLATED');
GetEData('QUERY_STRING');
GetEData('REMOTE_ADDR');
GetEData('REMOTE_HOST');
GetEData('REMOTE_IDENT');
GetEData('REMOTE_USER');
GetEData('REQUEST_METHOD');
GetEData('SCRIPT_NAME');
GetEData('SERVER_NAME');
GetEData('SERVER_PORT');
GetEData('SERVER_PROTOCOL');
GetEData('SERVER_SOFTWARE');
{ Standard HTTP Environment Variables }
GetEData('HTTP_ACCEPT');
GetEData('HTTP_ACCEPT_CHARSET');
GetEData('HTTP_ACCEPT_ENCODING');
GetEData('HTTP_IF_MODIFIED_SINCE');
GetEData('HTTP_REFERER');
GetEData('HTTP_USER_AGENT');
end;
procedure TEZcgi.ProcessRequest;
var
request : String;
begin
request := GetVal('REQUEST_METHOD');
if request = '' then
OutputError('No REQUEST_METHOD passed from server!')
else if request = 'POST' then
begin
ReadPostQuery;
DoPost;
end
else if request = 'GET' then
begin
ReadGetQuery;
DoGet;
end
else
OutputError('Invalid REQUEST_METHOD passed from server!');
end;
function TEZcgi.GetVal(Index : String) : String;
begin
result := FVariables.Values[Index];
end;
function TEZcgi.GetName(Index : Integer) : String;
begin
result := FVariables.Names[Index];
end;
function TEZcgi.GetVariable(Index : Integer) : String;
begin
result := FVariables[Index];
end;
function TEZcgi.GetVarCount : Integer;
begin
result := FVariables.Count;
end;
procedure TEZcgi.ReadPostQuery;
var
index : Integer;
ch : Char;
temp : String;
code : Word;
contentLength : Integer;
theType : String;
begin
temp := GetVal('CONTENT_LENGTH');
if Length(temp) > 0 then
begin
Val(temp, contentLength, code);
if code <> 0 then
contentLength := 0;
end;
if contentLength = 0 then
OutputError('No content length passed from server!');
theType := UpperCase(GetVal('CONTENT_TYPE'));
if theType <> 'APPLICATION/X-WWW-FORM-URLENCODED' then
OutputError('No content type passed from server!');
FQueryString := '';
for index := 0 to contentLength-1 do
begin
Read(ch);
FQueryString := FQueryString + ch;
end;
GetQueryItems;
end;
procedure TEZcgi.ReadGetQuery;
begin
FQueryString := GetVal('QUERY_STRING');
if FQueryString = '' then
OutputError('No QUERY_STRING passed from server!');
GetQueryItems;
end;
procedure TEZcgi.GetQueryItems;
var
queryItem : String;
delimiter : Char;
function hexConverter(h1, h2 : Char) : Char;
var
thex : byte;
begin
tHex := (Pos(upcase(h1), hexTable) - 1) * 16;
tHex := tHex + Pos(upcase(h2), hexTable) - 1;
result := chr(thex);
end;
procedure Convert_ESC_Chars;
var
index : Integer;
begin
repeat
index := Pos('+', queryItem);
if index > 0 then
queryItem[index] := Chr(32);
until index = 0;
repeat
index := Pos('%', queryItem);
if index > 0 then
begin
queryItem[index] := hexConverter(queryItem[index + 1], queryItem[index + 2]);
system.Delete(queryItem, index + 1, 2);
end;
until index = 0;
end;
begin
InitToken(FQueryString, '&');
while NextToken(queryItem, delimiter) do
begin
if queryItem <> '' then
begin
Convert_ESC_Chars;
FVariables.Add(queryItem);
end;
end;
end;
procedure TEZcgi.OutputError(errorMessage : String);
begin
WriteContent('text/html');
writeln('<html><head><title>CGI ERROR</title></head>');
writeln('<body>');
writeln('<center><hr><h1>CGI ERROR</h1><hr></center><br><br>');
writeln('This CGI application encountered the following error: <br>');
writeln('<ul><br>');
writeln('<li> error: ',errorMessage,'<br><hr>');
writeln('<h5><p><i>Notify ',FName,' <a href="mailto:',FEmail,'">',FEmail,'</a></i></p></h5>');
writeln('</body></html>');
Raise ECGIException.Create(errorMessage);
end;
procedure TEZcgi.InitToken(aStr, aSep : String);
begin
aString := aStr;
aSepStr := aSep;
aPos := 1;
aLenStr := Length(aString);
aLenSep := Length(aSepStr);
end;
function TEZcgi.NextToken(var aToken : String; var aSepChar : Char) : Boolean;
var
i : Integer;
j : Integer;
BoT : Integer;
EoT : Integer;
isSep : Boolean;
begin
BoT := aPos;
EoT := aPos;
for i := aPos to aLenStr do
begin
IsSep := false;
for j := 1 to aLenSep do
begin
if aString[i] = aSepStr[j] then
begin
IsSep := true;
Break;
end;
end;
if IsSep then
begin
EoT := i;
aPos := i + 1;
aSepChar := aString[i];
Break;
end
else
begin
if i = aLenStr then
begin
EoT := i;
aPos := i;
Break;
end;
end;
end;
if aPos < aLenStr then
begin
aToken := Copy(aString, BoT, EoT - BoT);
Result := true;
end
else
begin
if aPos = aLenStr then
begin
aToken := Copy(aString, BoT, EoT - BoT + 1);
Result := true;
aPos := aPos + 1;
end
else
begin
Result := false;
end;
end;
end;
end.
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