yolanda/trunk/functions.pl

require "include.pl";

sub get_userinfo_from_sid
{
    #get parameters
    my ($sid) = @_;
    
    #prepare query
    my $sth = $dbh->prepare(qq{select id, username, locale, pagesize, cortado from users where sid = ?}) or die $dbh->errstr;
    
    #execute it
    $sth->execute($sid) or die $dbh->errstr;
    
    #save the resulting username
    ($userinfo->{'id'}, $userinfo->{'username'}, $userinfo->{'locale'}, $userinfo->{'pagesize'}, $userinfo->{'cortado'}) = $sth->fetchrow_array();
    
    #finish query
    $sth->finish() or die $dbh->errstr;
    
    #return 
    return @userinfo;
}

sub get_page_array
{
    #get parameters
    my (@userinfo) = @_;
    
    #if user is logged in, use his locale setting and check for new upload status
    if($userinfo->{'username'})
    {
        $page->{'locale'} = $userinfo->{'locale'};
    }
    #else get the locale from the http server variable
    else
    {
        ($page->{'locale'}) = $query->http('HTTP_ACCEPT_LANGUAGE') =~ /^([^,]+),.*$/;
        unless($page->{'locale'})
        {
            $page->{'locale'} = "en_us";
        }
    }
    
    $page->{'username'} = $userinfo->{'username'};
    $page->{'stylesheet'} = $stylesheet;
    $page->{'xmlns:dc'} = $xmlns_dc;
    $page->{'xmlns:cc'} = $xmlns_cc;
    $page->{'xmlns:rdf'} = $xmlns_rdf;
}

# called by video.pl (display ambiguous videos),
# search.pl (display search results)
# and upload.pl (display similar videos)
sub fill_results
{
    #prepare query
    my $sth = $dbh->prepare($dbquery) or die $dbh->errstr;
    
    #execute it
    $resultcount = $sth->execute(@_) or die $dbh->errstr;
    
    #set pagesize by query or usersettings or default
    $pagesize = $query->param('pagesize') or $pagesize =  $userinfo->{'pagesize'} or $pagesize = $defaultpagesize;
    
    #if pagesize is more than maxpagesize reduce to maxpagesize
    $pagesize = $pagesize > $maxpagesize ? $maxpagesize : $pagesize;
    
    #rediculous but funny round up, will fail with 100000000000000 results per page
    #on 0.0000000000001% of all queries - this is a risk we can handle
    $lastpage = int($resultcount/$pagesize+0.99999999999999);
    
    $currentpage = $query->param('page') or $currentpage = 1;
    
    $dbquery .= " limit ".($currentpage-1)*$pagesize.", ".$pagesize;
    
    #prepare query
    $sth = $dbh->prepare($dbquery) or die $dbh->errstr;
    
    #execute it
    $sth->execute(@_) or die $dbquery;
    
    $page->{'results'}->{'lastpage'} = $lastpage;
    $page->{'results'}->{'currentpage'} = $currentpage;
    $page->{'results'}->{'resultcount'} = $resultcount eq '0E0' ? 0 : $resultcount;
    $page->{'results'}->{'pagesize'} = $pagesize;
    
    #get every returned value
    while (my ($id, $title, $description, $publisher, $timestamp, $creator,
        $subject, $source, $language, $coverage, $rights,
        $license, $filesize, $duration, $width, $height, $fps, $viewcount,
        $downloadcount) = $sth->fetchrow_array())
    {
        #before code cleanup, this was a really obfuscated array/hash creation
        push @{ $page->{'results'}->{'result'} },
        {
            'thumbnail' => $duration == 0 ? "/images/tango/video-x-generic.png" : "/video-stills/$id",
            'duration'  => $duration,
            'viewcount' => $viewcount,
            'edit'      => $userinfo->{'username'} eq $publisher ? "true" : "false",
            'rdf:RDF'   =>
            {
                'cc:Work'   =>
                {
                    'rdf:about'         => "$domain/download/$id/",
                    'dc:title'          => [$title],
                    'dc:creator'        => [$creator],
                    'dc:subject'        => [$subject],
                    'dc:description'    => [$description],
                    'dc:publisher'      => [$publisher],
                    'dc:date'           => [$timestamp],
                    'dc:identifier'     => ["$domain/video/".urlencode($title)."/$id/" . ($duration == 0 ? "/action=edit" : "")],
                    'dc:source'         => [$source],
                    'dc:language'       => [$language],
                    'dc:coverage'       => [$coverage],
                    'dc:rights'         => [$rights]
                },
                'cc:License'    =>
                {
                    'rdf:about'     => 'http://creativecommons.org/licenses/GPL/2.0/'
                }
            }
        };
    }
    
    #finish query
    $sth->finish() or die $dbh->errstr;
}

#replace chars in url as said in this rfc: http://www.rfc-editor.org/rfc/rfc1738.txt
sub urlencode
{
    my ($url) = @_[0];
    $url =~ s/([^A-Za-z0-9_\$\-.+!*'()])/sprintf("%%%02X", ord($1))/eg;
    return $url;
}

sub output_page
{
    use XML::LibXSLT;
    use XML::LibXML;
    
    my $parser = XML::LibXML->new();
    my $xslt = XML::LibXSLT->new();
    
    #let the xslt param choose other stylesheets or default to xhtml.xsl
    my $param_xslt = $query->param('xslt');
    $param_xslt =~ s/[^\w]//gi;
    
    if( -f "$root/xsl/$param_xslt.xsl")
    {
        $xsltpath = "$root/xsl/$param_xslt.xsl"
    }
    else
    {
        $xsltpath = "$root/xsl/xhtml.xsl";
    }

    my $stylesheet = $xslt->parse_stylesheet($parser->parse_file($xsltpath));

    #TODO: this usage of libxsl omits the xsl:output definition (no ident of html) but outputs in UTF8
    #TODO: later versions of XML::LibXSLT (>= 1.62) define output_as_bytes - this is what we want to use
    #TODO: wait for debian packagers to update to 1.62 or later
    $foo = $stylesheet->transform(
                $parser->parse_string(
                    XMLout(
                        $page,
                        KeyAttr => {},
                        RootName => 'page',
                        AttrIndent => '1'
                    )
                )
            );
    
    if($query->param('cortado') eq 'true')
    {
        @cookies = [$session->cookie(-name=>$session_name, -value=>$session->id), $session->cookie(-name=>'cortado', -value=>'true')];
    }
    elsif($query->param('cortado') eq 'false')
    {
        @cookies = [$session->cookie(-name=>$session_name, -value=>$session->id), $session->cookie(-name=>'cortado', -value=>'false')];
    }
    else
    {
        @cookies = [$session->cookie(-name=>$session_name, -value=>$session->id)];
    }
    
    #send everything including http headers to the user - if xslt chosen is xspf set download filename
    return $session->header(
            -type=>'application/xhtml+xml',
            # fix the MIME type so that every XSLT works again
            -charset=>'UTF-8',
            -cookie=>@cookies
        ),
        $foo->toString;
}