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unit pkgDownload;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, pkghandler;
Type
{ TBaseDownloader }
TBaseDownloader = Class(TComponent)
Private
FBackupFile : Boolean;
Protected
// Needs overriding.
Procedure FTPDownload(Const URL : String; Dest : TStream); Virtual;
Procedure HTTPDownload(Const URL : String; Dest : TStream); Virtual;
Procedure FileDownload(Const URL : String; Dest : TStream); Virtual;
Public
Procedure Download(Const URL,DestFileName : String);
Procedure Download(Const URL : String; Dest : TStream);
Property BackupFiles : Boolean Read FBackupFile Write FBackupFile;
end;
TBaseDownloaderClass = Class of TBaseDownloader;
{ TDownloadPackage }
TDownloadPackage = Class(TPackagehandler)
Public
Procedure Execute;override;
end;
procedure RegisterDownloader(const AName:string;Downloaderclass:TBaseDownloaderClass);
function GetDownloader(const AName:string):TBaseDownloaderClass;
procedure DownloadFile(const RemoteFile,LocalFile:String);
implementation
uses
contnrs,
uriparser,
fprepos,
pkgglobals,
pkgoptions,
pkgmessages,
pkgrepos;
var
DownloaderList : TFPHashList;
procedure RegisterDownloader(const AName:string;Downloaderclass:TBaseDownloaderClass);
begin
if DownloaderList.Find(AName)<>nil then
begin
Error('Downloader already registered');
exit;
end;
DownloaderList.Add(AName,Downloaderclass);
end;
function GetDownloader(const AName:string):TBaseDownloaderClass;
begin
result:=TBaseDownloaderClass(DownloaderList.Find(AName));
if result=nil then
Error('Downloader %s not supported',[AName]);
end;
procedure DownloadFile(const RemoteFile,LocalFile:String);
var
DownloaderClass : TBaseDownloaderClass;
begin
DownloaderClass:=GetDownloader(GlobalOptions.Downloader);
with DownloaderClass.Create(nil) do
try
Download(RemoteFile,LocalFile);
finally
Free;
end;
end;
{ TBaseDownloader }
procedure TBaseDownloader.FTPDownload(const URL: String; Dest: TStream);
begin
Error(SErrNoFTPDownload);
end;
procedure TBaseDownloader.HTTPDownload(const URL: String; Dest: TStream);
begin
Error(SErrNoHTTPDownload);
end;
procedure TBaseDownloader.FileDownload(const URL: String; Dest: TStream);
Var
FN : String;
F : TFileStream;
begin
URIToFilename(URL,FN);
If Not FileExists(FN) then
Error(SErrNoSuchFile,[FN]);
F:=TFileStream.Create(FN,fmOpenRead);
Try
Dest.CopyFrom(F,0);
Finally
F.Free;
end;
end;
procedure TBaseDownloader.Download(const URL, DestFileName: String);
Var
F : TFileStream;
begin
If FileExists(DestFileName) and BackupFiles then
BackupFile(DestFileName);
try
F:=TFileStream.Create(DestFileName,fmCreate);
try
Download(URL,F);
finally
F.Free;
end;
except
DeleteFile(DestFileName);
raise;
end;
end;
procedure TBaseDownloader.Download(const URL: String; Dest: TStream);
Var
URI : TURI;
P : String;
begin
URI:=ParseURI(URL);
P:=URI.Protocol;
If CompareText(P,'ftp')=0 then
FTPDownload(URL,Dest)
else if (CompareText(P,'http')=0) or (CompareText(P,'https')=0) then
HTTPDownload(URL,Dest)
else if CompareText(P,'file')=0 then
FileDownload(URL,Dest)
else
Error(SErrUnknownProtocol,[P]);
end;
{ TDownloadPackage }
procedure TDownloadPackage.Execute;
var
DownloaderClass : TBaseDownloaderClass;
P : TFPPackage;
begin
P:=AvailableRepository.PackageByName(PackageName);
DownloaderClass:=GetDownloader(GlobalOptions.Downloader);
with DownloaderClass.Create(nil) do
try
Log(llCommands,SLogDownloading,[PackageRemoteArchive(P),PackageLocalArchive(P)]);
pkgglobals.log(llProgres,SProgrDownloadPackage,[P.Name, P.Version.AsString]);
Download(PackageRemoteArchive(P),PackageLocalArchive(P));
finally
Free;
end;
end;
initialization
DownloaderList:=TFPHashList.Create;
RegisterDownloader('base',TBaseDownloader);
RegisterPkgHandler('downloadpackage',TDownloadPackage);
finalization
FreeAndNil(DownloaderList);
end.
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