Delphi Indy登錄並下載文件

Question

問題是我不能下載文件（導致我沒有記錄）。我可以登錄，但沒有更多。 Delphi版本：XE2, Indy版本：10.5.8.0（也在Delphi XE4上用最新的Indy測試過）。有1970r日期的一個cookie。感謝幫助。

代碼：（登錄名和密碼都是真實的）

var 
    IdHTTP: TIdHTTP; 
    Request: TStringList; 
    Response: TMemoryStream; 
    File: TMemoryStream; 
begin 
    try 
    Response := TMemoryStream.Create; 
    try 
     Request := TStringList.Create; 
     try 
     Request.Add('user[login]=1212test1212'); 
     Request.Add('user[password]=test1212'); 
     IdHTTP := TIdHTTP.Create; 
     File := TMemoryStream.Create; 
     try 
      IdHTTP.AllowCookies := True; 
      IdHTTP.CookieManager:=Form1.IdCookieManager1; 
      IdHTTP.HandleRedirects := True; 
      IdHTTP.Request.ContentType := 'application/x-www-form-urlencoded'; 
      IdHTTP.Post('http://www.twitch.tv/login', Request, Response); 
      IdHTTP.Get('http://www.twitch.tv/broadcast/fmle3_config',File); 
      File.SaveToFile('C:\aaa.xml'); 
     finally 
      IdHTTP.Free; 
      MS.Free; 
     end; 
     finally 
     Request.Free; 
     end; 
    finally 
     Response.Free; 
    end; 
    except 
    on E: Exception do 
     ShowMessage(E.Message); 
    end; 
end; 

HTTP分析日誌：

(Status-Line):HTTP/1.1 302 Moved Temporarily 
Cache-Control:no-cache, no-store, must-revalidate 
Pragma:no-cache 
Set-Cookie:feature_bucket=83; domain=.twitch.tv; path=/ 
Set-Cookie:name=1212test1212; domain=.twitch.tv; path=/; expires=Tue, 06-Aug-2013 19:20:52 GMT 
Set-Cookie:_twitch_session_id=16d9fc8368fe22701324c7ce39c9f668; domain=.twitch.tv; path=/; expires=Wed, 24-Jul-2013 07:20:52 GMT; HttpOnly 
Set-Cookie:unique_id=a5b16cf36861154f9dd118e673fd4aa0; domain=.twitch.tv; path=/ 
Set-Cookie:persistent=46516706_1212test1212_35ptd94szs8ysrpfcckrcx21t; domain=.twitch.tv; path=/; expires=Tue, 06-Aug-2013 19:20:52 GMT; HttpOnly 
Set-Cookie:login=1212test1212; domain=.twitch.tv; path=/; expires=Tue, 06-Aug-2013 19:20:52 GMT 
Set-Cookie:last_login=Tue+Jul+23+19%3A20%3A52+UTC+2013; domain=.twitch.tv; path=/; expires=Tue, 06-Aug-2013 19:20:52 GMT 
Set-Cookie:language=en; domain=.twitch.tv; path=/; expires=Sat, 23-Jul-2033 19:20:52 GMT 
Set-Cookie:api_token=daa32f51e6d015daf9c7a1949d1ef9e0; domain=.twitch.tv; path=/; expires=Tue, 06-Aug-2013 19:20:52 GMT 
Content-Length:144 
Content-Type:text/html 
Location:http://www.twitch.tv/ 
Server:nginx 
Front-End-Https:off 
P3P:CP="CAO PSA OUR" 
status:302 Found 
x-geo:PL 
x-rack-cache:invalidate, pass 
x-request-id:a829998aa94c51788ec9b504656639f3 
x-runtime:0.272887 
x-ua-compatible:IE=Edge,chrome=1 
Date:Tue, 23 Jul 2013 19:20:52 GMT 
Connection:close 

(Status-Line):HTTP/1.1 200 OK 
Cache-Control:no-cache, no-store, must-revalidate 
Pragma:no-cache 
Set-Cookie:_twitch_session_id=860dc07ccd1dd937f1cb6adfc84a7f14; domain=.twitch.tv; path=/; expires=Wed, 24-Jul-2013 07:20:53 GMT; HttpOnly 
Set-Cookie:persistent=; domain=.twitch.tv; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT 
Content-Length:59850 
Content-Type:text/html; charset=utf-8 
Server:nginx 
Front-End-Https:off 
status:200 OK 
x-geo:PL 
x-rack-cache:invalidate, pass 
x-request-id:2557352c302a3eddfe9080882aaa3028 
x-runtime:0.301446 
x-ua-compatible:IE=Edge,chrome=1 
Date:Tue, 23 Jul 2013 19:20:53 GMT 
Connection:close 

(Status-Line):HTTP/1.1 302 Moved Temporarily 
Cache-Control:must-revalidate, no-cache, no-store, private 
Pragma:no-cache 
Set-Cookie:_twitch_session_id=860dc07ccd1dd937f1cb6adfc84a7f14; domain=.twitch.tv; path=/; expires=Wed, 24-Jul-2013 07:20:54 GMT; HttpOnly 
Content-Length:150 
Content-Type:text/html 
Location:http://www.twitch.tv/signup 
Server:nginx 
Front-End-Https:off 
status:302 Found 
x-geo:PL 
x-rack-cache:miss 
x-request-id:b35e5b998a633b80cfb1f53373e5627a 
x-runtime:0.029409 
X-UA-Compatible:IE=Edge,chrome=1 
Date:Tue, 23 Jul 2013 19:20:54 GMT 
Connection:keep-alive 

http://img197.imageshack.us/img197/7007/xgyf.jpg

Answer 1

你是不是正確的URL登錄。 http://www.twitch.tv/login只是用戶在其Web瀏覽器中填寫的HTML登錄表單，然後提交到實際登錄URL，即https://secure.twitch.tv/user/login。如果您查看該登錄表單的HTML，則會看到該表單以及需要提交但尚未提交的幾個隱藏表單字段。

此外，由於實際登錄URL使用的是HTTPS，因此您需要將SSL IOHandler附加到TIdHTTP，例如TIdSSLIOHandlerSocketOpenSSL。

並且使事情變得複雜，當請求http://www.twitch.tv/login時，會動態生成所需的authenticity_token值，因此您需要先下載登錄表單的HTML，手動解析出令牌值，然後完成登錄提交。

試試這個：

var 
    IdHTTP: TIdHTTP; 
    IdSSL: TIdSSLIOHandlerSocketOpenSSL; 
    HTML, AuthToken: string; 
    Request: TStringList; 
    File: TMemoryStream; 
begin 
    try 
    IdHTTP := TIdHTTP.Create; 
    try 
     IdSSL := TIdSSLIOHandlerSocketOpenSSL.Create(IdHTTP); 
     IdHTTP.IOHandler := IdSSL; 

     IdHTTP.AllowCookies := True; 
     IdHTTP.CookieManager := Form1.IdCookieManager1; 
     IdHTTP.HandleRedirects := True; 

     HTML := IdHTTP.Get('http://www.twitch.tv/login'); 
     AuthToken := ...; // parse the HTML to extract the authenticity_token value... 

     Request := TStringList.Create; 
     try 
     Request.Add('utf8=✓'); 
     Request.Add('authenticity_token=' + AuthToken); 
     Request.Add('redirect_on_login=http://www.twitch.tv/'); 
     Request.Add('embed_form=false'); 
     Request.Add('user[login]=1212test1212'); 
     Request.Add('user[password]=test1212'); 

     IdHTTP.Post('https://secure.twitch.tv/user/login', Request, nil, IndyUTF8Encoding); 
     finally 
     Request.Free; 
     end; 

     File := TMemoryStream.Create; 
     try 
     IdHTTP.Get('http://www.twitch.tv/broadcast/fmle3_config', File); 
     File.SaveToFile('C:\aaa.xml'); 
     finally 
     File.Free; 
     end; 
    finally 
     IdHTTP.Free; 
    end; 
    except 
    on E: Exception do 
     ShowMessage(E.Message); 
    end; 
end; 

雖這麼說，因爲登錄表單進行重定向當登錄成功後指定的URL，你可以試試這個稍短的方法來避免一個往返：

var 
    IdHTTP: TIdHTTP; 
    IdSSL: TIdSSLIOHandlerSocketOpenSSL; 
    HTML, AuthToken: string; 
    Request: TStringList; 
    File: TMemoryStream; 
begin 
    try 
    IdHTTP := TIdHTTP.Create; 
    try 
     IdSSL := TIdSSLIOHandlerSocketOpenSSL.Create(IdHTTP); 
     IdHTTP.IOHandler := IdSSL; 

     IdHTTP.AllowCookies := True; 
     IdHTTP.CookieManager := Form1.IdCookieManager1; 
     IdHTTP.HandleRedirects := True; 

     HTML := IdHTTP.Get('http://www.twitch.tv/login'); 
     AuthToken := ...; // parse the HTML to extract the authenticity_token value... 

     Request := TStringList.Create; 
     try 
     Request.Add('utf8=✓'); 
     Request.Add('authenticity_token=' + AuthToken); 
     Request.Add('redirect_on_login=http://www.twitch.tv/broadcast/fmle3_config'); 
     Request.Add('embed_form=false'); 
     Request.Add('user[login]=1212test1212'); 
     Request.Add('user[password]=test1212'); 

     File := TMemoryStream.Create; 
     try 
      IdHTTP.Post('https://secure.twitch.tv/user/login', Request, File, IndyUTF8Encoding); 
      File.SaveToFile('C:\aaa.xml'); 
     finally 
      File.Free; 
     end; 
     finally 
     Request.Free; 
     end; 
    finally 
     IdHTTP.Free; 
    end; 
    except 
    on E: Exception do 
     ShowMessage(E.Message); 
    end; 
end;