File Coverage

blib/lib/URI.pm

Criterion	Covered	Total	%
statement	185	197	93.9
branch	79	94	84.0
condition	23	31	74.1
subroutine	32	36	88.8
pod	15	19	78.9
total	334	377	88.5

package URI;

use strict;
use warnings;

our $VERSION = '5.21';

# 1=version 5.10 and earlier; 0=version 5.11 and later
use constant HAS_RESERVED_SQUARE_BRACKETS => $ENV{URI_HAS_RESERVED_SQUARE_BRACKETS} ? 1 : 0;

our ($ABS_REMOTE_LEADING_DOTS, $ABS_ALLOW_RELATIVE_SCHEME, $DEFAULT_QUERY_FORM_DELIMITER);

my %implements;  # mapping from scheme to implementor class

# Some "official" character classes

our $reserved   = HAS_RESERVED_SQUARE_BRACKETS ? q(;/?:@&=+$,[]) : q(;/?:@&=+$,);
our $mark       = q(-_.!~*'());                                    #'; emacs
our $unreserved = "A-Za-z0-9\Q$mark\E";
our $uric       = quotemeta($reserved) . $unreserved . "%";
our $uric4host  = $uric . ( HAS_RESERVED_SQUARE_BRACKETS ? '' : quotemeta( q([]) ) );
our $uric4user  = quotemeta( q{!$'()*,;:._~%-+=%&} ) . "A-Za-z0-9" . ( HAS_RESERVED_SQUARE_BRACKETS ? quotemeta( q([]) ) : '' ); # RFC-3987: iuserinfo w/o UTF

our $scheme_re  = '[a-zA-Z][a-zA-Z0-9.+\-]*';

# These schemes don't have an IPv6+ address part.
our $schemes_without_host_part_re = 'data|ldapi|urn|sqlite|sqlite3';

# These schemes can have an IPv6+ authority part:
#     file, ftp, gopher, http, https, ldap, ldaps, mms, news, nntp, nntps, pop, rlogin, rtsp, rtspu, rsync, sip, sips, snews,
#     telnet, tn3270, ssh, sftp
#     (all DB URIs, i.e. cassandra, couch, couchdb, etc.), except 'sqlite:', 'sqlite3:'. Others?
#MAINT: URI has no test coverage for DB schemes
#MAINT: decoupling - perhaps let each class decide itself by defining a member function 'scheme_has_authority_part()'?

#MAINT: 'mailto:' needs special treatment for IPv* addresses / RFC 5321 (4.1.3). Until then: restore all '[', ']'
# These schemes need fallback to previous (<= 5.10) encoding until a specific handler is available.
our $fallback_schemes_re = 'mailto';

use Carp ();
use URI::Escape ();

use overload ('""'     => sub { ${$_[0]} },
              '=='     => sub { _obj_eq(@_) },
              '!='     => sub { !_obj_eq(@_) },
              fallback => 1,
             );

# Check if two objects are the same object
sub _obj_eq {
    return overload::StrVal($_[0]) eq overload::StrVal($_[1]);
}

sub new
{
    my($class, $uri, $scheme) = @_;

    $uri = defined ($uri) ? "$uri" : "";   # stringify
    # Get rid of potential wrapping
    $uri =~ s/^<(?:URL:)?(.*)>$/$1/;  #
    $uri =~ s/^"(.*)"$/$1/;
    $uri =~ s/^\s+//;
    $uri =~ s/\s+$//;

    my $impclass;
    if ($uri =~ m/^($scheme_re):/so) {
	$scheme = $1;
    }
    else {
	if (($impclass = ref($scheme))) {
	    $scheme = $scheme->scheme;
	}
	elsif ($scheme && $scheme =~ m/^($scheme_re)(?::|$)/o) {
	    $scheme = $1;
        }
    }
    $impclass ||= implementor($scheme) ||
	do {
	    require URI::_foreign;
	    $impclass = 'URI::_foreign';
	};

    return $impclass->_init($uri, $scheme);
}


sub new_abs
{
    my($class, $uri, $base) = @_;
    $uri = $class->new($uri, $base);
    $uri->abs($base);
}


sub _init
{
    my $class = shift;
    my($str, $scheme) = @_;
    # find all funny characters and encode the bytes.
    $str = $class->_uric_escape($str);
    $str = "$scheme:$str" unless $str =~ /^$scheme_re:/o ||
                                 $class->_no_scheme_ok;
    my $self = bless \$str, $class;
    $self;
}


#-- Version: 5.11+
#   Since the complete URI will be percent-encoded including '[' and ']',
#   we selectively unescape square brackets from the authority/host part of the URI.
#   Derived modules that implement _uric_escape() should take this into account
#   if they do not rely on URI::_uric_escape().
#   No unescaping is performed for the userinfo@ part of the authority part.
sub _fix_uric_escape_for_host_part {
  return if HAS_RESERVED_SQUARE_BRACKETS;
  return if $_[0] !~ /%/;
  return if $_[0] =~ m{^(?:$URI::schemes_without_host_part_re):}os;

  # until a scheme specific handler is available, fall back to previous behavior of v5.10 (i.e. 'mailto:')
  if ($_[0] =~ m{^(?:$URI::fallback_schemes_re):}os) {
    $_[0]    =~ s/\%5B/[/gi;
    $_[0]    =~ s/\%5D/]/gi;
    return;
  }

  if ($_[0] =~ m{^((?:$URI::scheme_re:)?)//([^/?\#]+)(.*)$}os) {
    my $orig          = $2;
    my ($user, $host) = $orig =~ /^(.*@)?([^@]*)$/;
    $user  ||= '';
    my $port = $host =~ s/(:\d+)$// ? $1 : '';
    #MAINT: die() here if scheme indicates TCP/UDP and port is out of range [0..65535] ?
    $host    =~ s/\%5B/[/gi;
    $host    =~ s/\%5D/]/gi;
    $_[0]    =~ s/\Q$orig\E/$user$host$port/;
  }
}


sub _uric_escape
{
    my($class, $str) = @_;
    $str =~ s*([^$uric\#])* URI::Escape::escape_char($1) *ego;
    _fix_uric_escape_for_host_part( $str );
    utf8::downgrade($str);
    return $str;
}

my %require_attempted;

sub implementor
{
    my($scheme, $impclass) = @_;
    if (!$scheme || $scheme !~ /\A$scheme_re\z/o) {
	require URI::_generic;
	return "URI::_generic";
    }

    $scheme = lc($scheme);

    if ($impclass) {
	# Set the implementor class for a given scheme
        my $old = $implements{$scheme};
        $impclass->_init_implementor($scheme);
        $implements{$scheme} = $impclass;
        return $old;
    }

    my $ic = $implements{$scheme};
    return $ic if $ic;

    # scheme not yet known, look for internal or
    # preloaded (with 'use') implementation
    $ic = "URI::$scheme";  # default location

    # turn scheme into a valid perl identifier by a simple transformation...
    $ic =~ s/\+/_P/g;
    $ic =~ s/\./_O/g;
    $ic =~ s/\-/_/g;

    no strict 'refs';
    # check we actually have one for the scheme:
    unless (@{"${ic}::ISA"}) {
        if (not exists $require_attempted{$ic}) {
            # Try to load it
            my $_old_error = $@;
            eval "require $ic";
            die $@ if $@ && $@ !~ /Can\'t locate.*in \@INC/;
            $@ = $_old_error;
        }
        return undef unless @{"${ic}::ISA"};
    }

    $ic->_init_implementor($scheme);
    $implements{$scheme} = $ic;
    $ic;
}


sub _init_implementor
{
    my($class, $scheme) = @_;
    # Remember that one implementor class may actually
    # serve to implement several URI schemes.
}


sub clone
{
    my $self = shift;
    my $other = $$self;
    bless \$other, ref $self;
}

sub TO_JSON { ${$_[0]} }

sub _no_scheme_ok { 0 }

sub _scheme
{
    my $self = shift;

    unless (@_) {
	return undef unless $$self =~ /^($scheme_re):/o;
	return $1;
    }

    my $old;
    my $new = shift;
    if (defined($new) && length($new)) {
	Carp::croak("Bad scheme '$new'") unless $new =~ /^$scheme_re$/o;
	$old = $1 if $$self =~ s/^($scheme_re)://o;
	my $newself = URI->new("$new:$$self");
	$$self = $$newself;
	bless $self, ref($newself);
    }
    else {
	if ($self->_no_scheme_ok) {
	    $old = $1 if $$self =~ s/^($scheme_re)://o;
	    Carp::carp("Oops, opaque part now look like scheme")
		if $^W && $$self =~ m/^$scheme_re:/o
	}
	else {
	    $old = $1 if $$self =~ m/^($scheme_re):/o;
	}
    }

    return $old;
}

sub scheme
{
    my $scheme = shift->_scheme(@_);
    return undef unless defined $scheme;
    lc($scheme);
}

sub has_recognized_scheme {
    my $self = shift;
    return ref($self) !~ /^URI::_(?:foreign|generic)\z/;
}

sub opaque
{
    my $self = shift;

    unless (@_) {
	$$self =~ /^(?:$scheme_re:)?([^\#]*)/o or die;
	return $1;
    }

    $$self =~ /^($scheme_re:)?    # optional scheme
	        ([^\#]*)          # opaque
                (\#.*)?           # optional fragment
              $/sx or die;

    my $old_scheme = $1;
    my $old_opaque = $2;
    my $old_frag   = $3;

    my $new_opaque = shift;
    $new_opaque = "" unless defined $new_opaque;
    $new_opaque =~ s/([^$uric])/ URI::Escape::escape_char($1)/ego;
    utf8::downgrade($new_opaque);

    $$self = defined($old_scheme) ? $old_scheme : "";
    $$self .= $new_opaque;
    $$self .= $old_frag if defined $old_frag;

    $old_opaque;
}

sub path { goto &opaque }  # alias


sub fragment
{
    my $self = shift;
    unless (@_) {
	return undef unless $$self =~ /\#(.*)/s;
	return $1;
    }

    my $old;
    $old = $1 if $$self =~ s/\#(.*)//s;

    my $new_frag = shift;
    if (defined $new_frag) {
	$new_frag =~ s/([^$uric])/ URI::Escape::escape_char($1) /ego;
	utf8::downgrade($new_frag);
	$$self .= "#$new_frag";
    }
    $old;
}


sub as_string
{
    my $self = shift;
    $$self;
}


sub as_iri
{
    my $self = shift;
    my $str = $$self;
    if ($str =~ s/%([89a-fA-F][0-9a-fA-F])/chr(hex($1))/eg) {
	# All this crap because the more obvious:
	#
	#   Encode::decode("UTF-8", $str, sub { sprintf "%%%02X", shift })
	#
	# doesn't work before Encode 2.39.  Wait for a standard release
	# to bundle that version.

	require Encode;
	my $enc = Encode::find_encoding("UTF-8");
	my $u = "";
	while (length $str) {
	    $u .= $enc->decode($str, Encode::FB_QUIET());
	    if (length $str) {
		# escape next char
		$u .= URI::Escape::escape_char(substr($str, 0, 1, ""));
	    }
	}
	$str = $u;
    }
    return $str;
}


sub canonical
{
    # Make sure scheme is lowercased, that we don't escape unreserved chars,
    # and that we use upcase escape sequences.

    my $self = shift;
    my $scheme = $self->_scheme || "";
    my $uc_scheme = $scheme =~ /[A-Z]/;
    my $esc = $$self =~ /%[a-fA-F0-9]{2}/;
    return $self unless $uc_scheme || $esc;

    my $other = $self->clone;
    if ($uc_scheme) {
	$other->_scheme(lc $scheme);
    }
    if ($esc) {
	$$other =~ s{%([0-9a-fA-F]{2})}
	            { my $a = chr(hex($1));
                      $a =~ /^[$unreserved]\z/o ? $a : "%\U$1"
                    }ge;
    }
    return $other;
}

# Compare two URIs, subclasses will provide a more correct implementation
sub eq {
    my($self, $other) = @_;
    $self  = URI->new($self, $other) unless ref $self;
    $other = URI->new($other, $self) unless ref $other;
    ref($self) eq ref($other) &&                # same class
	$self->canonical->as_string eq $other->canonical->as_string;
}

# generic-URI transformation methods
sub abs { $_[0]; }
sub rel { $_[0]; }

sub secure { 0 }

# help out Storable
sub STORABLE_freeze {
       my($self, $cloning) = @_;
       return $$self;
}

sub STORABLE_thaw {
       my($self, $cloning, $str) = @_;
       $$self = $str;
}

1;

__END__