[scpubgit/stemmatology.git] / stemmaweb / lib / stemmaweb / Controller / Root.pm

package stemmaweb::Controller::Root;
use Moose;
use namespace::autoclean;
use Text::Tradition::Analysis qw/ run_analysis /;
use TryCatch;


BEGIN { extends 'Catalyst::Controller' }

#
# Sets the actions in this controller to be registered with no prefix
# so they function identically to actions created in MyApp.pm
#
__PACKAGE__->config(namespace => '');

=head1 NAME

stemmaweb::Controller::Root - Root Controller for stemmaweb

=head1 DESCRIPTION

Serves up the main container pages.

=head1 URLs

=head2 index

The root page (/).  Serves the main container page, from which the various
components will be loaded.

=cut

sub index :Path :Args(0) {
    my ( $self, $c ) = @_;

    $c->stash->{template} = 'index.tt';
}

=head1 Elements of index page

=head2 directory

 GET /directory

Serves a snippet of HTML that lists the available texts.  This returns texts belonging to the logged-in user if any, otherwise it returns all public texts.

=cut

sub directory :Local :Args(0) {
	my( $self, $c ) = @_;
    my $m = $c->model('Directory');
    # Is someone logged in?
    my %usertexts;
    if( $c->user_exists ) {
    	my $user = $c->user->get_object;
    	my @list = $m->traditionlist( $user );
    	map { $usertexts{$_->{id}} = 1 } @list;
		$c->stash->{usertexts} = \@list;
		$c->stash->{is_admin} = 1 if $user->is_admin;
	}
	# List public (i.e. readonly) texts separately from any user (i.e.
	# full access) texts that exist. Admin users therefore have nothing
	# in this list.
	my @plist = grep { !$usertexts{$_->{id}} } $m->traditionlist('public');
	$c->stash->{publictexts} = \@plist;
	$c->stash->{template} = 'directory.tt';
}

=head1 AJAX methods for traditions and their properties

=head2 newtradition

 POST /newtradition,
 	{ name: <name>,
 	  language: <language>,
 	  public: <is_public>,
 	  file: <fileupload> }
 
Creates a new tradition belonging to the logged-in user, with the given name
and the collation given in the uploaded file. The file type is indicated via
the filename extension (.csv, .txt, .xls, .xlsx, .xml). Returns the ID and 
name of the new tradition.
 
=cut

sub newtradition :Local :Args(0) {
	my( $self, $c ) = @_;
	return _json_error( $c, 403, 'Cannot save a tradition without being logged in' )
		unless $c->user_exists;

	my $user = $c->user->get_object;
	# Grab the file upload, check its name/extension, and call the
	# appropriate parser(s).
	my $upload = $c->request->upload('file');
	my $name = $c->request->param('name') || 'Uploaded tradition';
	my $lang = $c->request->param( 'language' ) || 'Default';
	my $public = $c->request->param( 'public' ) ? 1 : undef;
	my( $ext ) = $upload->filename =~ /\.(\w+)$/;
	my %newopts = (
		'name' => $name,
		'language' => $lang,
		'public' => $public,
		'file' => $upload->tempname
		);

	my $tradition;
	my $errmsg;
	if( $ext eq 'xml' ) {
		# Try the different XML parsing options to see if one works.
		foreach my $type ( qw/ CollateX CTE TEI / ) {
			try {
				$tradition = Text::Tradition->new( %newopts, 'input' => $type );
			} catch ( Text::Tradition::Error $e ) {
				$errmsg = $e->message;
			} catch {
				$errmsg = "Unexpected parsing error";
			}
			last if $tradition;
		}
	} elsif( $ext =~ /^(txt|csv|xls(x)?)$/ ) {
		# If it's Excel we need to pass excel => $ext;
		# otherwise we need to pass sep_char => [record separator].
		if( $ext =~ /xls/ ) {
			$newopts{'excel'} = $ext;
		} else {
			$newopts{'sep_char'} = $ext eq 'txt' ? "\t" : ',';
		}
		try {
			$tradition = Text::Tradition->new( 
				%newopts,
				'input' => 'Tabular',
				);
		} catch ( Text::Tradition::Error $e ) {
			$errmsg = $e->message;
		} catch {
			$errmsg = "Unexpected parsing error";
		}
	} else {
		# Error unless we have a recognized filename extension
		return _json_error( $c, 500, "Unrecognized file type extension $ext" );
	}
	
	# Save the tradition if we have it, and return its data or else the
	# error that occurred trying to make it.
	if( $errmsg ) {
		return _json_error( $c, 500, "Error parsing tradition .$ext file: $errmsg" );
	} elsif( !$tradition ) {
		return _json_error( $c, 500, "No error caught but tradition not created" );
	}

	my $m = $c->model('Directory');
	$user->add_tradition( $tradition );
	my $id = $c->model('Directory')->store( $tradition );
	$c->model('Directory')->store( $user );
	$c->stash->{'result'} = { 'id' => $id, 'name' => $tradition->name };
	$c->forward('View::JSON');
}

=head2 textinfo

 GET /textinfo/$textid
 POST /textinfo/$textid, 
 	{ name: $new_name, 
 	  language: $new_language,
 	  public: $is_public, 
 	  owner: $new_userid } # only admin users can update the owner
 
Returns information about a particular text.

=cut

sub textinfo :Local :Args(1) {
	my( $self, $c, $textid ) = @_;
	my $tradition = $c->model('Directory')->tradition( $textid );
	unless( $tradition ) {
		return _json_error( $c, 500, "No tradition with ID $textid" );
	}	
	my $ok = _check_permission( $c, $tradition );
	return unless $ok;
	if( $c->req->method eq 'POST' ) {
		return _json_error( $c, 403, 
			'You do not have permission to update this tradition' ) 
			unless $ok eq 'full';
		my $params = $c->request->parameters;
		# Handle changes to owner-accessible parameters
		my $m = $c->model('Directory');
		my $changed;
		# Handle scalar params
		foreach my $param ( qw/ name language / ) {
			if( exists $params->{$param} ) {
				my $newval = delete $params->{$param};
				unless( $tradition->$param eq $newval ) {
					try {
						$tradition->$param( $newval );
					} catch {
						return _json_error( $c, 500, "Error setting $param to $newval" );
					}
					$changed = 1;
				}
			}
		}
		# Handle our boolean
		if( delete $params->{'public'} ) {  # if it's any true value...
			$tradition->public( 1 );
		}
		# Handle ownership changes
		my $newuser;
		if( exists $params->{'owner'} ) {
			# Only admins can update user / owner
			my $newownerid = delete $params->{'owner'};
			unless( $tradition->has_user && $tradition->user->id eq $newownerid ) {
				unless( $c->user->get_object->is_admin ) {
					return _json_error( $c, 403, 
						"Only admin users can change tradition ownership" );
				}
				$newuser = $m->lookup_user( $params->{'owner'} );
				unless( $newuser ) {
					return _json_error( $c, 500, "No such user " . $params->{'owner'} );
				}
				$newuser->add_tradition( $tradition );
				$changed = 1;
			}
		}
		# TODO check for rogue parameters
		if( scalar keys %$params ) {
			my $rogueparams = join( ', ', keys %$params );
			return _json_error( $c, 403, "Request parameters $rogueparams not recognized" );
		}
		# If we safely got to the end, then write to the database.
		$m->save( $tradition ) if $changed;
		$m->save( $newuser ) if $newuser;		
	}

	# Now return the current textinfo, whether GET or successful POST.
	my $textinfo = {
		textid => $textid,
		name => $tradition->name,
		language => $tradition->language,
		public => $tradition->public,
		owner => $tradition->user ? $tradition->user->id : undef,
		witnesses => [ map { $_->sigil } $tradition->witnesses ],
	};
	my @stemmasvg = map { $_->as_svg({ size => [ 500, 375 ] }) } $tradition->stemmata;
	map { $_ =~ s/\n/ /mg } @stemmasvg;
	$textinfo->{stemmata} = \@stemmasvg;
	$c->stash->{'result'} = $textinfo;
	$c->forward('View::JSON');
}

=head2 variantgraph

 GET /variantgraph/$textid
 
Returns the variant graph for the text specified at $textid, in SVG form.

=cut

sub variantgraph :Local :Args(1) {
	my( $self, $c, $textid ) = @_;
	my $tradition = $c->model('Directory')->tradition( $textid );
	unless( $tradition ) {
		return _json_error( $c, 500, "No tradition with ID $textid" );
	}	
	my $ok = _check_permission( $c, $tradition );
	return unless $ok;

	my $collation = $tradition->collation;
	$c->stash->{'result'} = $collation->as_svg;
	$c->forward('View::SVG');
}
	
=head2 stemma

 GET /stemma/$textid/$stemmaseq
 POST /stemma/$textid/$stemmaseq, { 'dot' => $dot_string }

Returns an SVG representation of the given stemma hypothesis for the text.  
If the URL is called with POST, the stemma at $stemmaseq will be altered
to reflect the definition in $dot_string. If $stemmaseq is 'n', a new
stemma will be added.

=cut

sub stemma :Local :Args(2) {
	my( $self, $c, $textid, $stemmaid ) = @_;
	my $m = $c->model('Directory');
	my $tradition = $m->tradition( $textid );
	unless( $tradition ) {
		return _json_error( $c, 500, "No tradition with ID $textid" );
	}	
	my $ok = _check_permission( $c, $tradition );
	return unless $ok;

	$c->stash->{'result'} = '';
	my $stemma;
	if( $c->req->method eq 'POST' ) {
		if( $ok eq 'full' ) {
			my $dot = $c->request->body_params->{'dot'};
			try {
				if( $stemmaid eq 'n' ) {
					# We are adding a new stemma.
					$stemma = $tradition->add_stemma( 'dot' => $dot );
				} elsif( $stemmaid < $tradition->stemma_count ) {
					# We are updating an existing stemma.
					$stemma = $tradition->stemma( $stemmaid );
					$stemma->alter_graph( $dot );
				} else {
					# Unrecognized stemma ID
					return _json_error( $c, 500, "No stemma at index $stemmaid, cannot update" );
				}
			} catch ( Text::Tradition::Error $e ) {
				return _json_error( $c, 500, $e->message );
			}
			$m->store( $tradition );
		} else {
			# No permissions to update the stemma
			return _json_error( $c, 403, 
				'You do not have permission to update stemmata for this tradition' );
		}
	}
	
	# For a GET or a successful POST request, return the SVG representation
	# of the stemma in question, if any.
	$c->log->debug( "Received Accept header: " . $c->req->header('Accept') );
	if( !$stemma && $tradition->stemma_count > $stemmaid ) {
		$stemma = $tradition->stemma( $stemmaid );
	}
	$c->stash->{'result'} = $stemma 
		? $stemma->as_svg( { size => [ 500, 375 ] } ) : '';
	$c->forward('View::SVG');
}

=head2 stemmadot

 GET /stemmadot/$textid/$stemmaseq
 
Returns the 'dot' format representation of the current stemma hypothesis.

=cut

sub stemmadot :Local :Args(2) {
	my( $self, $c, $textid, $stemmaid ) = @_;
	my $m = $c->model('Directory');
	my $tradition = $m->tradition( $textid );
	unless( $tradition ) {
		return _json_error( $c, 500, "No tradition with ID $textid" );
	}	
	my $ok = _check_permission( $c, $tradition );
	return unless $ok;
	my $stemma = $tradition->stemma( $stemmaid );
	unless( $stemma ) {
		return _json_error( $c, 500, "Tradition $textid has no stemma ID $stemmaid" );
	}
	# Get the dot and transmute its line breaks to literal '|n'
	$c->stash->{'result'} = { 'dot' =>  $stemma->editable( { linesep => '|n' } ) };
	$c->forward('View::JSON');
}

####################
### Helper functions
####################

# Helper to check what permission, if any, the active user has for
# the given tradition
sub _check_permission {
	my( $c, $tradition ) = @_;
    my $user = $c->user_exists ? $c->user->get_object : undef;
    if( $user ) {
    	return 'full' if ( $user->is_admin || 
    		( $tradition->has_user && $tradition->user->id eq $user->id ) );
    }
	# Text doesn't belong to us, so maybe it's public?
	return 'readonly' if $tradition->public;

	# ...nope. Forbidden!
	return _json_error( $c, 403, 'You do not have permission to view this tradition.' );
}

# Helper to throw a JSON exception
sub _json_error {
	my( $c, $code, $errmsg ) = @_;
	$c->response->status( $code );
	$c->stash->{'result'} = { 'error' => $errmsg };
	$c->forward('View::JSON');
	return 0;
}

=head2 default

Standard 404 error page

=cut

sub default :Path {
    my ( $self, $c ) = @_;
    $c->response->body( 'Page not found' );
    $c->response->status(404);
}

=head2 end

Attempt to render a view, if needed.

=cut

sub end : ActionClass('RenderView') {}

=head1 AUTHOR

Tara L Andrews

=head1 LICENSE

This library is free software. You can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

__PACKAGE__->meta->make_immutable;

1;
Commit	Line	Data
5c9ecf66	1	package stemmaweb::Controller::Root;
dbcf12a6	2	use Moose;
dbcf12a6	3	use namespace::autoclean;
3837c155	4	use Text::Tradition::Analysis qw/ run_analysis /;
852190b9	5	use TryCatch;
3837c155	6
dbcf12a6	7
	8	BEGIN { extends 'Catalyst::Controller' }
	9
	10	#
	11	# Sets the actions in this controller to be registered with no prefix
	12	# so they function identically to actions created in MyApp.pm
	13	#
	14	__PACKAGE__->config(namespace => '');
	15
	16	=head1 NAME
	17
5c9ecf66	18	stemmaweb::Controller::Root - Root Controller for stemmaweb
dbcf12a6	19
	20	=head1 DESCRIPTION
	21
6b70c348	22	Serves up the main container pages.
dbcf12a6	23
6b70c348	24	=head1 URLs
dbcf12a6	25
	26	=head2 index
	27
6b70c348	28	The root page (/). Serves the main container page, from which the various
6b70c348	29	components will be loaded.
dbcf12a6	30
	31	=cut
	32
	33	sub index :Path :Args(0) {
	34	my ( $self, $c ) = @_;
	35
6b70c348	36	$c->stash->{template} = 'index.tt';
	37	}
	38
	39	=head1 Elements of index page
	40
	41	=head2 directory
	42
	43	GET /directory
	44
7c256818	45	Serves a snippet of HTML that lists the available texts. This returns texts belonging to the logged-in user if any, otherwise it returns all public texts.
6b70c348	46
6b70c348	47	=cut
7c256818	48
2376359f	49	sub directory :Local :Args(0) {
6b70c348	50	my( $self, $c ) = @_;
3837c155	51	my $m = $c->model('Directory');
27a20fbe	52	# Is someone logged in?
3524c08f	53	my %usertexts;
27a20fbe	54	if( $c->user_exists ) {
27a20fbe	55	my $user = $c->user->get_object;
3524c08f	56	my @list = $m->traditionlist( $user );
	57	map { $usertexts{$_->{id}} = 1 } @list;
	58	$c->stash->{usertexts} = \@list;
27a20fbe	59	$c->stash->{is_admin} = 1 if $user->is_admin;
27a20fbe	60	}
3524c08f	61	# List public (i.e. readonly) texts separately from any user (i.e.
	62	# full access) texts that exist. Admin users therefore have nothing
	63	# in this list.
	64	my @plist = grep { !$usertexts{$_->{id}} } $m->traditionlist('public');
	65	$c->stash->{publictexts} = \@plist;
6b70c348	66	$c->stash->{template} = 'directory.tt';
	67	}
	68
0bded693	69	=head1 AJAX methods for traditions and their properties
cf9626aa	70
0bded693	71	=head2 newtradition
	72
	73	POST /newtradition,
	74	{ name: <name>,
	75	language: <language>,
	76	public: <is_public>,
	77	file: <fileupload> }
cf9626aa	78
0bded693	79	Creates a new tradition belonging to the logged-in user, with the given name
	80	and the collation given in the uploaded file. The file type is indicated via
	81	the filename extension (.csv, .txt, .xls, .xlsx, .xml). Returns the ID and
	82	name of the new tradition.
	83
	84	=cut
	85
	86	sub newtradition :Local :Args(0) {
	87	my( $self, $c ) = @_;
	88	return _json_error( $c, 403, 'Cannot save a tradition without being logged in' )
	89	unless $c->user_exists;
	90
	91	my $user = $c->user->get_object;
	92	# Grab the file upload, check its name/extension, and call the
	93	# appropriate parser(s).
	94	my $upload = $c->request->upload('file');
	95	my $name = $c->request->param('name') \|\| 'Uploaded tradition';
	96	my $lang = $c->request->param( 'language' ) \|\| 'Default';
	97	my $public = $c->request->param( 'public' ) ? 1 : undef;
	98	my( $ext ) = $upload->filename =~ /\.(\w+)$/;
	99	my %newopts = (
	100	'name' => $name,
	101	'language' => $lang,
	102	'public' => $public,
	103	'file' => $upload->tempname
	104	);
	105
	106	my $tradition;
	107	my $errmsg;
	108	if( $ext eq 'xml' ) {
	109	# Try the different XML parsing options to see if one works.
	110	foreach my $type ( qw/ CollateX CTE TEI / ) {
	111	try {
	112	$tradition = Text::Tradition->new( %newopts, 'input' => $type );
	113	} catch ( Text::Tradition::Error $e ) {
	114	$errmsg = $e->message;
	115	} catch {
	116	$errmsg = "Unexpected parsing error";
	117	}
	118	last if $tradition;
	119	}
	120	} elsif( $ext =~ /^(txt\|csv\|xls(x)?)$/ ) {
	121	# If it's Excel we need to pass excel => $ext;
	122	# otherwise we need to pass sep_char => [record separator].
	123	if( $ext =~ /xls/ ) {
	124	$newopts{'excel'} = $ext;
	125	} else {
	126	$newopts{'sep_char'} = $ext eq 'txt' ? "\t" : ',';
	127	}
	128	try {
	129	$tradition = Text::Tradition->new(
	130	%newopts,
	131	'input' => 'Tabular',
	132	);
	133	} catch ( Text::Tradition::Error $e ) {
	134	$errmsg = $e->message;
	135	} catch {
	136	$errmsg = "Unexpected parsing error";
	137	}
	138	} else {
	139	# Error unless we have a recognized filename extension
	140	return _json_error( $c, 500, "Unrecognized file type extension $ext" );
	141	}
	142
143	# Save the tradition if we have it, and return its data or else the
144	# error that occurred trying to make it.
145	if( $errmsg ) {
146	return _json_error( $c, 500, "Error parsing tradition .$ext file: $errmsg" );
147	} elsif( !$tradition ) {
148	return _json_error( $c, 500, "No error caught but tradition not created" );
149	}
150
151	my $m = $c->model('Directory');
152	$user->add_tradition( $tradition );
153	my $id = $c->model('Directory')->store( $tradition );
154	$c->model('Directory')->store( $user );
155	$c->stash->{'result'} = { 'id' => $id, 'name' => $tradition->name };
156	$c->forward('View::JSON');
157	}
158
159	=head2 textinfo
160
161	GET /textinfo/$textid
162	POST /textinfo/$textid,
163	{ name: $new_name,
164	language: $new_language,
165	public: $is_public,
166	owner: $new_userid } # only admin users can update the owner
167
168	Returns information about a particular text.
cf9626aa	169
	170	=cut
	171
0bded693	172	sub textinfo :Local :Args(1) {
cf9626aa	173	my( $self, $c, $textid ) = @_;
3524c08f	174	my $tradition = $c->model('Directory')->tradition( $textid );
0bded693	175	unless( $tradition ) {
	176	return _json_error( $c, 500, "No tradition with ID $textid" );
	177	}
852190b9	178	my $ok = _check_permission( $c, $tradition );
852190b9	179	return unless $ok;
0bded693	180	if( $c->req->method eq 'POST' ) {
	181	return _json_error( $c, 403,
	182	'You do not have permission to update this tradition' )
	183	unless $ok eq 'full';
	184	my $params = $c->request->parameters;
	185	# Handle changes to owner-accessible parameters
	186	my $m = $c->model('Directory');
	187	my $changed;
	188	# Handle scalar params
	189	foreach my $param ( qw/ name language / ) {
	190	if( exists $params->{$param} ) {
	191	my $newval = delete $params->{$param};
	192	unless( $tradition->$param eq $newval ) {
	193	try {
	194	$tradition->$param( $newval );
	195	} catch {
	196	return _json_error( $c, 500, "Error setting $param to $newval" );
	197	}
	198	$changed = 1;
	199	}
	200	}
	201	}
	202	# Handle our boolean
	203	if( delete $params->{'public'} ) { # if it's any true value...
	204	$tradition->public( 1 );
	205	}
	206	# Handle ownership changes
	207	my $newuser;
	208	if( exists $params->{'owner'} ) {
	209	# Only admins can update user / owner
	210	my $newownerid = delete $params->{'owner'};
	211	unless( $tradition->has_user && $tradition->user->id eq $newownerid ) {
	212	unless( $c->user->get_object->is_admin ) {
	213	return _json_error( $c, 403,
	214	"Only admin users can change tradition ownership" );
	215	}
	216	$newuser = $m->lookup_user( $params->{'owner'} );
	217	unless( $newuser ) {
	218	return _json_error( $c, 500, "No such user " . $params->{'owner'} );
	219	}
	220	$newuser->add_tradition( $tradition );
	221	$changed = 1;
	222	}
	223	}
	224	# TODO check for rogue parameters
	225	if( scalar keys %$params ) {
	226	my $rogueparams = join( ', ', keys %$params );
	227	return _json_error( $c, 403, "Request parameters $rogueparams not recognized" );
	228	}
	229	# If we safely got to the end, then write to the database.
	230	$m->save( $tradition ) if $changed;
	231	$m->save( $newuser ) if $newuser;
	232	}
852190b9	233
0bded693	234	# Now return the current textinfo, whether GET or successful POST.
	235	my $textinfo = {
	236	textid => $textid,
	237	name => $tradition->name,
	238	language => $tradition->language,
	239	public => $tradition->public,
	240	owner => $tradition->user ? $tradition->user->id : undef,
	241	witnesses => [ map { $_->sigil } $tradition->witnesses ],
	242	};
	243	my @stemmasvg = map { $_->as_svg({ size => [ 500, 375 ] }) } $tradition->stemmata;
	244	map { $_ =~ s/\n/ /mg } @stemmasvg;
	245	$textinfo->{stemmata} = \@stemmasvg;
	246	$c->stash->{'result'} = $textinfo;
	247	$c->forward('View::JSON');
cf9626aa	248	}
6b70c348	249
0bded693	250	=head2 variantgraph
6b70c348	251
0bded693	252	GET /variantgraph/$textid
	253
	254	Returns the variant graph for the text specified at $textid, in SVG form.
6b70c348	255
	256	=cut
	257
0bded693	258	sub variantgraph :Local :Args(1) {
6b70c348	259	my( $self, $c, $textid ) = @_;
3524c08f	260	my $tradition = $c->model('Directory')->tradition( $textid );
0bded693	261	unless( $tradition ) {
	262	return _json_error( $c, 500, "No tradition with ID $textid" );
	263	}
852190b9	264	my $ok = _check_permission( $c, $tradition );
	265	return unless $ok;
	266
3524c08f	267	my $collation = $tradition->collation;
0bded693	268	$c->stash->{'result'} = $collation->as_svg;
0bded693	269	$c->forward('View::SVG');
6b70c348	270	}
0bded693	271
6b70c348	272	=head2 stemma
6b70c348	273
0bded693	274	GET /stemma/$textid/$stemmaseq
0bded693	275	POST /stemma/$textid/$stemmaseq, { 'dot' => $dot_string }
6b70c348	276
0bded693	277	Returns an SVG representation of the given stemma hypothesis for the text.
	278	If the URL is called with POST, the stemma at $stemmaseq will be altered
	279	to reflect the definition in $dot_string. If $stemmaseq is 'n', a new
	280	stemma will be added.
6b70c348	281
	282	=cut
	283
0bded693	284	sub stemma :Local :Args(2) {
852190b9	285	my( $self, $c, $textid, $stemmaid ) = @_;
6b70c348	286	my $m = $c->model('Directory');
6b70c348	287	my $tradition = $m->tradition( $textid );
0bded693	288	unless( $tradition ) {
	289	return _json_error( $c, 500, "No tradition with ID $textid" );
	290	}
852190b9	291	my $ok = _check_permission( $c, $tradition );
	292	return unless $ok;
	293
852190b9	294	$c->stash->{'result'} = '';
0bded693	295	my $stemma;
	296	if( $c->req->method eq 'POST' ) {
	297	if( $ok eq 'full' ) {
852190b9	298	my $dot = $c->request->body_params->{'dot'};
0bded693	299	try {
	300	if( $stemmaid eq 'n' ) {
	301	# We are adding a new stemma.
	302	$stemma = $tradition->add_stemma( 'dot' => $dot );
	303	} elsif( $stemmaid < $tradition->stemma_count ) {
	304	# We are updating an existing stemma.
	305	$stemma = $tradition->stemma( $stemmaid );
	306	$stemma->alter_graph( $dot );
	307	} else {
	308	# Unrecognized stemma ID
	309	return _json_error( $c, 500, "No stemma at index $stemmaid, cannot update" );
	310	}
	311	} catch ( Text::Tradition::Error $e ) {
	312	return _json_error( $c, 500, $e->message );
	313	}
852190b9	314	$m->store( $tradition );
0bded693	315	} else {
	316	# No permissions to update the stemma
	317	return _json_error( $c, 403,
	318	'You do not have permission to update stemmata for this tradition' );
852190b9	319	}
6b70c348	320	}
0bded693	321
	322	# For a GET or a successful POST request, return the SVG representation
	323	# of the stemma in question, if any.
	324	$c->log->debug( "Received Accept header: " . $c->req->header('Accept') );
	325	if( !$stemma && $tradition->stemma_count > $stemmaid ) {
	326	$stemma = $tradition->stemma( $stemmaid );
	327	}
	328	$c->stash->{'result'} = $stemma
	329	? $stemma->as_svg( { size => [ 500, 375 ] } ) : '';
6b70c348	330	$c->forward('View::SVG');
dbcf12a6	331	}
dbcf12a6	332
6b70c348	333	=head2 stemmadot
12720144	334
0bded693	335	GET /stemmadot/$textid/$stemmaseq
6b70c348	336
	337	Returns the 'dot' format representation of the current stemma hypothesis.
	338
	339	=cut
	340
0bded693	341	sub stemmadot :Local :Args(2) {
0bded693	342	my( $self, $c, $textid, $stemmaid ) = @_;
6b70c348	343	my $m = $c->model('Directory');
6b70c348	344	my $tradition = $m->tradition( $textid );
0bded693	345	unless( $tradition ) {
	346	return _json_error( $c, 500, "No tradition with ID $textid" );
	347	}
852190b9	348	my $ok = _check_permission( $c, $tradition );
852190b9	349	return unless $ok;
0bded693	350	my $stemma = $tradition->stemma( $stemmaid );
	351	unless( $stemma ) {
	352	return _json_error( $c, 500, "Tradition $textid has no stemma ID $stemmaid" );
	353	}
	354	# Get the dot and transmute its line breaks to literal '\|n'
	355	$c->stash->{'result'} = { 'dot' => $stemma->editable( { linesep => '\|n' } ) };
852190b9	356	$c->forward('View::JSON');
	357	}
	358
0bded693	359	####################
	360	### Helper functions
	361	####################
852190b9	362
0bded693	363	# Helper to check what permission, if any, the active user has for
0bded693	364	# the given tradition
852190b9	365	sub _check_permission {
	366	my( $c, $tradition ) = @_;
	367	my $user = $c->user_exists ? $c->user->get_object : undef;
	368	if( $user ) {
2b4baccc	369	return 'full' if ( $user->is_admin \|\|
2b4baccc	370	( $tradition->has_user && $tradition->user->id eq $user->id ) );
75ce4f7a	371	}
	372	# Text doesn't belong to us, so maybe it's public?
	373	return 'readonly' if $tradition->public;
	374
	375	# ...nope. Forbidden!
0bded693	376	return _json_error( $c, 403, 'You do not have permission to view this tradition.' );
	377	}
	378
	379	# Helper to throw a JSON exception
	380	sub _json_error {
	381	my( $c, $code, $errmsg ) = @_;
	382	$c->response->status( $code );
	383	$c->stash->{'result'} = { 'error' => $errmsg };
	384	$c->forward('View::JSON');
2b4baccc	385	return 0;
852190b9	386	}
852190b9	387
dbcf12a6	388	=head2 default
	389
	390	Standard 404 error page
	391
	392	=cut
	393
	394	sub default :Path {
	395	my ( $self, $c ) = @_;
	396	$c->response->body( 'Page not found' );
	397	$c->response->status(404);
	398	}
	399
	400	=head2 end
	401
	402	Attempt to render a view, if needed.
	403
	404	=cut
	405
	406	sub end : ActionClass('RenderView') {}
	407
	408	=head1 AUTHOR
	409
	410	Tara L Andrews
	411
	412	=head1 LICENSE
	413
	414	This library is free software. You can redistribute it and/or modify
	415	it under the same terms as Perl itself.
	416
	417	=cut
	418
	419	__PACKAGE__->meta->make_immutable;
	420
	421	1;