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# url handler -> returns the location of thefilu&# Interface |
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# url handler -> returns the location of the file |
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# Interface |
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# --------- |
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# new() : |
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# new(cachedir) : A new urlhandler with a defined default cahce directory |
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# get(url) : download from the specified url to the default cache |
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# get(url,dirlocation) : download to the specified directory |
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# new(cache) : A new urlhandler with a defined default cahce directory |
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# get(url,[location]) : download from the specified url to cache or location |
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# return the full url path name incl. any base expansion |
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# and the filename downloaded to |
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# setbase(type,variablehash) : set the url defaults for a specific url type |
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# arguments are dependenton type |
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# arguments are dependent on type |
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# unsetbase(type) : deactivate a previously set base |
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# setcache(dir) : set the default cache location |
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# currentbase(type) : return the current base for the given type |
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# |
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# ---------------------------------------------------------------------- |
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# returns file location - or crashes out |
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package URL::URLhandler; |
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require 5.004; |
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use Utilities::AddDir; |
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use URL::URL_base; |
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use URL::URLcache; |
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use URL::URLclass; |
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use URL::URLbase; |
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use Carp; |
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sub new { |
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use Utilities::AddDir; |
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my $self=shift; |
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my $cache=shift; |
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if (! defined $cache ) { $cache="/tmp/SCRAMcache" }; # default cache |
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AddDir::adddir($cache); |
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$self->{cache}=$cache; |
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$self->{dummybase}=URL::URLbase->new({}); |
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$self->{cachestore}=$self->{cache}->filestore(); |
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use URL::URL_cvs; |
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use URL::URL_cvsfile; |
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use URL::URL_file; |
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use URL::URL_filed; |
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$self->{urlmodules}={ |
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'cvsfile' => 'URL::URL_cvsfile', |
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'cvs' => 'URL::URL_cvs', |
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'file' => 'URL::URL_file' |
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'file' => 'URL::URL_file', |
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'filed' => 'URL::URL_filed' |
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}; |
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$self->{filebase}=""; |
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$self->setbase("file", {}); # Base file as default |
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$self->setbase("filed", {}); # Base file as default |
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} |
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sub setcache { |
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my $self=shift; |
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my $cache=shift; |
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$self->{cache}=$cache; |
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} |
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sub get ($@) { |
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sub get { |
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my $self=shift; |
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my $origurl=shift; |
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my $dirname=shift; |
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my $rest; |
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my $type; |
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my $url; |
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my $version; |
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my $rv=""; |
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if ( ! defined $dirname ) { |
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$dirname=$self->{cache}; |
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} |
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chdir $dirname or carp "Unable to Enter Directory $dirname $!\n"; |
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chomp $origurl; |
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# get our version info from the url (after last ??) |
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( $url, $version) = split /\?\?/, $origurl; |
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if ( $url=~/:/ ) { |
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($type,$rest) = split /:/, $url; |
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} |
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else { |
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$type='label'; |
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$rest=$url.":".$version; |
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} |
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if ( ! ( exists $self->{'urlmodules'}{$type}) ) { |
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print "URLhandler: Unsupported type $type\n"; |
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carp; |
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} |
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else { |
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if ( $#{$self->{urlostack}{$type}} < 0 ) { |
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print "URLhandler : base not set for type $type \n"; |
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} |
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else { |
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$rv= |
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eval{${$self->{urlostack}{$type}}[$#{$self->{urlostack}{$type}}]}-> |
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get($rest); |
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} |
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# Process the URL string |
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$url=URL::URLclass->new($origurl); |
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my $type=$url->type(); |
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$urltypehandler=$self->_typehandler($type); |
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$url->expandurl($self->currentbase($type)); |
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# Generate a location name if not provided |
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if ( @_ ) { |
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$location=shift; |
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} |
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if ( $rv ne "" ) { |
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$rv=$dirname."/".$rv; |
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else { |
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$location=$self->{cache}->filename($url->url()); |
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} |
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return $rv; |
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# -- get the file form the appropriate handler |
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if ( defined $urltypehandler ) { |
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# Call the download module |
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$file=eval{$urltypehandler->get($url, $location)}; |
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} |
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# now register it in the cache if successful |
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if ( $file ) { |
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$self->{cache}->store($fullurl, $rv); |
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} |
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return ($fullurl, $file); |
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} |
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sub setbase { |
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my @args=@_; |
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my $oref; |
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# Check type is supported |
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if ( ! exists $self->{urlmodules}{$type} ) { |
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print "URLhandler error: Unsupported type $type\n"; |
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return 1; |
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} |
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else { |
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# A new URL object - pushed onto the stack |
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$oref=eval{$self->{urlmodules}{$type}}->new(); |
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push @{$self->{urlostack}{$type}}, $oref; |
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$oref->setbase(@args); |
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} |
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$self->checktype($type); |
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# make a new base object |
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my $base=URL::URLbase->new(@_); |
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push @{$self->{basestack}{$type}}, $base; |
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} |
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sub unsetbase { |
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my $type=shift; |
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my $oref; |
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# Check type is supported |
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$self->checktype($type); |
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# pop off the stack and call the unset base method |
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if ( $#{$self->{basestack}{$type}} >=0 ) { |
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my $base=pop @{$self->{basestack}{$type}}; |
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undef $base; |
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} |
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else { |
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die "URLhandler error: Unable to unset type $type\n"; |
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} |
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} |
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sub currentbase { |
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my $self=shift; |
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my $type=shift; |
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my $rv; |
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|
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if ( exists $self->{basestack}{$type} ) { |
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$rv=$self->{basestack}{$type}[$#$self->{basestack}{$type}]; |
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} |
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else { |
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$rv=$self->{dummybase}; |
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} |
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return $rv; |
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} |
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|
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sub checktype($type) { |
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my $self=shift; |
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my $type=shift; |
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# Check type is supported |
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if ( ! exists $self->{urlmodules}{$type} ) { |
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print "URLhandler error: Unsupported type $type\n"; |
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return 1; |
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} |
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else { |
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# pop off the stack and call the unset base method |
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if ( $#{$self->{urlostack}{$type}} >=0 ) { |
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$oref=pop @{$self->{urlostack}{$type}}; |
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$oref->unsetbase(); |
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undef $oref; |
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} |
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else { |
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print "URLhandler error: Unable to unset type $type\n"; |
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return 1; |
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} |
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die "URLhandler error: Unsupported type $type\n"; |
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} |
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} |
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# ------------------------ General Support Routines ---------------------------- |
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sub _typehandler { |
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my $self=shift; |
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my $type=shift; |
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sub cachefilename { |
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my $self=shift; |
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use File::Basename; |
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use Utilities::AddDir; |
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my $filebase=dirname($rest); |
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$cache="/tmp/williamc/urlhandler$$"; |
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adddir($cache); |
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$filename=$cache."/".$filebase; |
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} |
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$self->checktype($type); |
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# instantiate only if it dosnt already exist; |
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(exists $self->{urlobjs}{$type})?$self->{urlobjs}{$type} |
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:$self->{urlobjs}{$type}=$self->{urlmodules}{$type}->new(); |
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} |
