#!/usr/local/bin/perl 
#
# This metaweblog API for blosxom is based on Blogger-2-LiveJournal.
# Modifications are made by Mattias Eriksson <snaggen@acc.umu.se>
# http://www.acc.umu.se/~snaggen/
#
# Blogger-2-LiveJournal, installed as a CGI, this processes XML-RPC requests
#	conforming to the Blogger API, and translates them in to the equivalent
#	LiveJournal request, returning the result as a normal Blogger API result type
#
# Released under the GNU GPL.  (http://www.gnu.org/copyleft/gpl.html)
# Simon Kittle, simon@kittle.co.uk
# http://www.tswoam.co.uk

#### Include Req'd modules
use strict;
use Frontier::RPC2;
use URI::Escape;

# Blog details
# This is the dir where the blogtextfiles are stored
my $blogdir = "/home/user/blogdir";

# This it the full path to your blog
my $blogurl = "http://www.example.com/~user/blog.cgi";

# This is the name of the blog
my $blogname = "The Blog of User";

#### Config variables
my $VERSION     = "0.1.0";                             # are
my $method_details = &get_introspection_data();

#### check the request is of the correct type, that we get XML, and a content length
my $length = &check_request();


#### Read in the body
my $body  = "";
my $count = read STDIN, $body, $length;
&http_error(400, "Bad Request") unless $count == $length; 
&http_error(400, "Bad Request (request empty)") if $length == 0;


#### Parse the XML in to a data structure 
my $methods = {'metaWeblog.newPost'        => \&metaWeblog_newPost,
	       'metaWeblog.editPost'       => \&metaWeblog_editPost,
	       'metaWeblog.getPost'        => \&metaWeblog_getPost,
	       'metaWeblog.getRecentPosts' => \&metaWeblog_getRecentPosts,
	       'blogger.getUsersBlogs'  => \&blogger_getUsersBlogs,
	       'blogger.deletePost'     => \&blogger_deletePost,

	       # "standard" introspection methods (http://xmlrpc.usefulinc.com/doc/reserved.html)
	       'system.listMethods'     => \&system_listMethods,
	       'system.methodSignature' => \&system_methodSignature,
	       'system.methodHelp'      => \&system_methodHelp
	   };



#### Serve our request.
my $coder = Frontier::RPC2->new;
print_xml_response($coder->serve($body, $methods));


#### we don't actually get here.  print_xml_response() exit's
exit;


######## -------------------------
######## Sub procedures under here
########

sub metaWeblog_newPost
{
    my ($blogid, $username, $password, $blog, $publish) = @_;
    my $methodName = "metaWeblog.newPost";
    die "Expecting " . $#{$method_details->{$methodName}->[0]} . " arguments for $methodName" unless ($#{$method_details->{$methodName}->[0]} == ($#_ + 1));
	
	my $title;
	my $content;
	my $date;
	
	$title = $$blog{'title'};
	$content = $$blog{'description'};
	$date = $$blog{'dateCreated'};	
	
	
	my $filetitle = $title;
	$filetitle =~ s/ /_/g;
	if ($filetitle eq "") {
		$filetitle = "no_title";
	}
	
	my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday) = gmtime(time);
	$year += 1900; #convert year to 4 digits.
	$mon = sprintf("%02d",$mon);
	$mday = sprintf("%02d",$mday);
	
	$hour = sprintf("%02d",$hour);
	$min = sprintf("%02d",$min);
	$sec = sprintf("%02d",$sec);

	my $postname = $year."-".$mon."-".$mday."_".$hour.":".$min.":".$sec."_".$filetitle;
	$postname =~ s/[^0-9a-zA-Z_\-:]/x/g;

	open(F,">$blogdir/$postname".".txt") or die;
	print F "$title\n\n$content";
	close(F);
   
    #FIXME: If $date, touch F;
	$postname = xml_enc($postname);
    print_xml_response(get_xml_resp_ok("<string>$postname</string>"));

    return("$postname"); # Doesn't work :(  retursn it in an <i4></i4>
}


sub metaWeblog_getPost
{
    my ($postid, $username, $password) = @_;
    my $methodName = "metaWeblog.getPost";
    die "Expecting " . $#{$method_details->{$methodName}->[0]} . " arguments for $methodName" unless ($#{$method_details->{$methodName}->[0]} == ($#_ + 1));

  	
	my $blog_item = "";
		
	$postid =~ s/[^0-9a-zA-Z_\-:]/x/g;
	if (open(B,"$blogdir/".$postid.".txt")) {
	my $title = <B>; #Read title;
	chomp($title);
			<B>; #Read extra space;
			my $postcontent = "";

			while (<B>) {
				$postcontent .= $_;	
			}
			my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
					$atime,$mtime,$ctime,$blksize,$blocks)
				= stat(B);
			my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday) = gmtime($mtime);
			$year += 1900; #convert year to 4 digits.
			$mon = sprintf("%02d",$mon);
			$mday = sprintf("%02d",$mday);

			$hour = sprintf("%02d",$hour);
			$min = sprintf("%02d",$min);
			$sec = sprintf("%02d",$sec);

			my $formateddate = $year.$mon.$mday."T".$hour.$min.$sec;

			my $link=$blogurl."/".$year."/".$mon."/".$mday."#".$postid;
			
			$blog_item .= &blogger_get_recent_event_xml("unknown",$formateddate,$title, $postcontent,$postid,$link,0);
			close B;
		}

   print_xml_response(get_xml_resp_ok($blog_item));
    return("blah");
}


sub metaWeblog_getRecentPosts
{
    my ($blogid, $username, $password, $numberOfPosts) = @_;
    my $methodName = "metaWeblog.getRecentPosts";
    die "Expecting " . $#{$method_details->{$methodName}->[0]} . " arguments for $methodName" unless ($#{$method_details->{$methodName}->[0]} == ($#_ + 1));

    my $blogs_recent = "<array><data>\n";
	
	opendir(DIR,$blogdir) or die;
	my @files = readdir(DIR);
	my @txtfiles;

	closedir DIR;
	
	my $i = 0;
	my $len = scalar(@files);
	for ($i = 0; $i < $len; $i++) {
		if ($files[$i]=~/\.txt$/) {
			my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
					$atime,$mtime,$ctime,$blksize,$blocks)
				= stat($blogdir."/".$files[$i]);
			$files[$i]=~s/\.txt$//g;
			push @txtfiles, $mtime."_".$files[$i]; 	
		}
	}
	my @sortedtxtfiles = sort {$b cmp $a} @txtfiles;
	my @selection = splice (@sortedtxtfiles,0,$numberOfPosts);
	my $title; 
	
	my $len = scalar(@selection);
	for ($i = 0; $i < $len; $i++) {
		$selection[$i] =~ s/^(.*?)_//;
		my $date = $1;
		if (open(B,"$blogdir/".$selection[$i].".txt")) {
			$title = <B>; #Read title;
			chomp($title);
			<B>; #Read extra space;
			my $postcontent = "";
			
			while (<B>) {
				#chomp;
				#s/<//g;
				#s/>//g;
				$postcontent .= $_;	
			}
			my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday) = gmtime($date);
			$year += 1900; #convert year to 4 digits.
			$mon = sprintf("%02d",$mon);
			$mday = sprintf("%02d",$mday);

			$hour = sprintf("%02d",$hour);
			$min = sprintf("%02d",$min);
			$sec = sprintf("%02d",$sec);
			
			my $formateddate = $year.$mon.$mday."T".$hour.$min.$sec;
			
			my $linkpostid = $selection[$i];
			
			my $link=$blogurl."/".$year."/".$mon."/".$mday."#".$linkpostid;
			$blogs_recent .= &blogger_get_recent_event_xml("unknown",$formateddate,$title, $postcontent,$selection[$i],$link,1);
			close B;
		}
	}
    $blogs_recent .= "\n</data></array>\n";
    
	print_xml_response(get_xml_resp_ok($blogs_recent));
    return("blah");
}


# Not really blogger but metaweblog... doesn't matter, it is just a name
sub blogger_get_recent_event_xml($$$$)
{
    my ($user, $date, $title, $content, $postid, $link, $valueTag) = @_;
    my $blog_event_xml = "";
	$user = xml_enc($user);
	$title = xml_enc($title);
	$content = xml_enc($content);
	$postid = xml_enc($postid);
	$link = xml_enc($link);

    $blog_event_xml .= "<value>\n" if ($valueTag);
    $blog_event_xml .= <<"EOXML2";
<struct>
	<member>
		<name>userid</name>
		<value><string>$user</string></value>
	</member>
	<member>
		<name>title</name>
		<value><string>$title</string></value>
	</member>
	<member>
		<name>description</name>
		<value><string>$content</string></value>
	</member>
	<member>
		<name>dateCreated</name>
		<value><dateTime.iso8601>$date</dateTime.iso8601></value>
	</member>
	<member>
		<name>postid</name>
		<value><string>$postid</string></value>
	</member>
	<member>
		<name>link</name>
		<value><string>$link</string></value>
	</member>
	<member>
		<name>permaLink</name>
		<value><string>$link</string></value>
	</member>
</struct>
EOXML2
    $blog_event_xml .= "</value>\n" if ($valueTag);
    return($blog_event_xml);
}


# Blogger api to retrieve the blogs, metaWeblog doesn't implement this    
sub blogger_getUsersBlogs
{
    my ($appkey, $username, $password) = @_;
    my $methodName = "blogger.getUsersBlogs";
    die "Expecting " . $#{$method_details->{$methodName}->[0]} . " arguments for $methodName" unless ($#{$method_details->{$methodName}->[0]} == ($#_ + 1));

    my $blog_details = "<array><data>";

	#Second argument is the blogid, but since this is a single user blog 
	#it is left empty
    $blog_details .= blogger_get_blog_details_xml($blogurl, "", $blogname);

    $blog_details .= "</data></array>";
    print_xml_response(get_xml_resp_ok($blog_details));
    return("blah");
}


sub blogger_get_blog_details_xml($$$)
{
    my ($url, $blogid, $blogName) = @_;
	$url = xml_enc($url);
	$blogid = xml_enc($blogid);
	$blogName = xml_enc($blogName);

    my $blog_details_xml = <<"EOXML";
<value>
	<struct>
		<member>
			<name>url</name>
			<value><string>$url</string></value>
		</member>
		<member>
			<name>blogid</name>
			<value><string>$blogid</string></value>
		</member>
		<member>
			<name>blogName</name>
			<value><string>$blogName</string></value>
		</member>
	</struct>
</value>
EOXML
    return($blog_details_xml);
}


sub metaWeblog_editPost 
{
    my ($postid, $username, $password, $blog, $publish) = @_;
    my $methodName = "metaWeblog.editPost";
    die "Expecting " . $#{$method_details->{$methodName}->[0]} . " arguments for $methodName" unless ($#{$method_details->{$methodName}->[0]} == ($#_ + 1));
		
	my $title = $$blog{'title'};
	my $content = $$blog{'description'};
	my $date = $$blog{'dateCreated'};
	
	
	$postid=~ s/[^0-9a-zA-Z_\-:]/x/g;
	if (-e "$blogdir/$postid".".txt") {
		my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
			$atime,$mtime,$ctime,$blksize,$blocks) = stat($blogdir."/".$postid.".txt");
		rename $blogdir."/".$postid.".txt", $blogdir."/".$postid.".bak";
		
	

		if (open(F,">$blogdir/$postid".".txt")) {
			print F "$title\n\n$content";
			close(F);
#FIXME if $date set date else use mtime;
			utime $atime, $mtime, ("$blogdir/$postid".".txt");
			unlink "$blogdir/$postid".".bak";
		} else {
			rename $blogdir."/".$postid.".bak", $blogdir."/".$postid.".txt";
			print_xml_response(get_xml_resp_ok("<boolean>0</boolean>"));
			return('false'); 
		}
	} else {
		print_xml_response(get_xml_resp_ok("<boolean>0</boolean>"));
		return('false'); 
	}

	print_xml_response(get_xml_resp_ok("<boolean>1</boolean>"));
    return('true'); # Doesn't work :(  retursn it in an <string></string>
}


#Blogger function to delete post, metaWeblog don't implement this
sub blogger_deletePost
{
    my ($appkey, $postid, $username, $password, $publish) = @_;
    my $methodName = "blogger.deletePost";
    die "Expecting " . $#{$method_details->{$methodName}->[0]} . " arguments for $methodName" unless ($#{$method_details->{$methodName}->[0]} == ($#_ + 1));
	$postid=~ s/[^0-9a-zA-Z_\-:]/x/g;
	
	unlink "$blogdir/$postid".".txt";

    print_xml_response(get_xml_resp_ok("<boolean>1</boolean>"));
    return('true'); # Doesn't work :(  retursn it in an <string></string>
}

sub system_listMethods()
{
    my $method_list    = "<array><data>\n";
    my @blah = ();

    foreach (keys %$method_details) {
	$method_list .= "<value>$_</value>\n";
	push @blah, $_;
    }
    $method_list .= "</data></array>";

    return(\@blah);
}

sub system_methodSignature($)
{
    my $method_name    = shift;
    my $method_found   = 0;
    my @methods        = ();

    foreach (keys %$method_details) {
	if ($_ eq $method_name) {
	    my @parameters = $method_details->{$_}[0];
	    push @methods, @parameters;
	    $method_found = 1;
	    last;  # in theory there could be multiple signatures, but we know there is no
		   # overloading int he Blogger API (at least not yet)
	}
    }

    die "Can't introspect: method unknown" if (!$method_found);
    return (\@methods);
}

sub system_methodHelp($)
{
    my $method_name    = shift;
    my $method_found   = 0;
    my $method_str;

    foreach (keys %$method_details) {
	if ($_ eq $method_name) {
	    $method_str = $method_details->{$_}[1];
	    $method_found = 1;
	    last;
	}
    }

    die "Can't introspect: method unknown" if (!$method_found);
    return ($method_str);
}


sub get_introspection_data
{
    #### This is all the data for the introspection methods.
    ####
    ####
    my $method_details = {'metaWeblog.newPost' =>
		          [
			   ["string","string", "string", "string", "string", "boolean" ],
			   "Accepts the following paramters: blogid (name of journal), username, password, content, publish (not used), and makes a post to the LiveJournal named in blogid.  On success returns a string containing the unique ID of the posted item."
			   ],
		      #### blogger.editPost
                      'metaWeblog.editPost' =>
			  [
			   ["boolean","string", "string", "string", "string", "boolean" ],
			   "Accepts the following paramters: appkey (client app string), postid, username, password, content, publish (not used), and then edits the post specified with the postid parameter.  On success returns 1 (as a boolean)."
			   ],
		      #### blogger.deletePost
                      'blogger.deletePost' =>
			  [
			   ["boolean","string","string", "string", "string",  "boolean" ],
			   "Accepts the following paramters: appkey (client app string), postid, username, password, publish (not used), will delete the post specified with the postid parameter.  On success returns 1 (as a boolean)."
			   ],
		      #### blogger.getUsersBlogs
                      'blogger.getUsersBlogs' =>
			  [
			   ["array", "string", "string", "string" ],
			   "Accepts the following paramters: appkey (client app string), username, password.  A list of the specified users journals are returned in an array.  Each journal is described in the array by a &lt;struct&gt; containing three member items: url, blodid, blogName.)."
			   ],
		      #### blogger.getRecentPosts
                      'metaWeblog.getRecentPosts' =>
			  [
			   ["array", "string", "string", "string", "int" ],
			   "Accepts the following paramters: blogid, username, password, numberOfPosts.  An array of structs - each containing one recent post - is returned.  The structs contain four elements: userid, dateCreated, postid, content."
			   ],
		      #### blogger.getPost
                      'metaWeblog.getPost' =>
			  [
			   ["array", "string", "string", "string" ],
			   "Accepts the following paramters: appkey (client app string), postid, username, password.  Returns a struct (like the ones returned with getRecentPosts).  The struct contain four elements: userid, dateCreated, postid, content."
			   ]
					     };

    return($method_details);
}


#### print_xml_response :: prints the HTTP headers, then the XML response.
##
sub print_xml_response($)
{
    my $response = shift;
    my $len = length($response);

    print "Connection: close\n";
    print "Content-Length: $len\n";
    print "Content-Type: text/xml\n";
    print "Date: " . scalar(localtime) . "\n";
    print "Server: tswoam.co.uk\n";
    print "\n";

    print $response . "\n";

    exit 0;
}


#### get_xml_resp_ok :: Using the supplied error code + fualt string message, 
##	 ** NOTE ** We probably shouldn't need this, as the Frontier::RPC2 module
##		    should do the XML generation, but I can't figure a way to force
##		    Frontier::RPC2 to generate a <string> response for the ITEMID 
##		    which is a number
sub get_xml_resp_ok($ )
{
    my $response_str = shift;
    my $xml_resp_text = "";
    
    $xml_resp_text = "<?xml version=\"1.0\"?>
<methodResponse>
	<params>
		<param>
			<value>$response_str</value>
			</param>
		</params>
	</methodResponse>";

    return($xml_resp_text);
}



#### check_request :: check we get a POST request, with some text/xml content and a
##		      Content-Length: header.
sub check_request() 
{
    # Get our CGI request information.
    my $method = $ENV{'REQUEST_METHOD'} || "";
    my $type   = $ENV{'CONTENT_TYPE'}   || "";
    my $length = $ENV{'CONTENT_LENGTH'} || 0;

    # Perform some sanity checks.
    &http_error(405, "Method Not Allowed") unless $method eq "POST";
    &http_error(400, "Bad Request")        unless $type eq "text/xml";
    &http_error(411, "Length Required")    unless $length > 0;

    return($length);
}


#### http_error :: send an HTTP header indicting an error.  (originally taken from the 
##		   XML-RPC How-To)
sub http_error ($$) 
{
    my ($code, $message) = @_;

    print "Status: $code $message\n";
    print "Content-Type: text/html\n\n";
    
    print "<html><head><title>$code $message</title></head>\n";
    print "<body bgcolor='#ffffff'>\n";
    print "<h1>$code $message</h1>\n";
    print "<br />Unexpected error while processing XML-RPC request.<br /><br />\n";
    print "<br />This script handle's XML-RPC requests.  <a href='http://www.xmlrpc.com'>Click here</a> for details.<br /><br />\n";
    print "</body></html>\n";

    exit 0;
}

sub xml_enc ($$)
{
	my ($string) = @_;

	$string =~ s/&/&amp;/g;
	$string =~ s/</&lt;/g;
	return($string);
}