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# -*- Mode: cperl; coding: utf-8; cperl-indent-level: 4 -*-
# vim: ts=4 sts=4 sw=4:
package CPAN::HTTP::Client;
use strict;
use vars qw(@ISA);
use CPAN::HTTP::Credentials;
use HTTP::Tiny 0.005;
$CPAN::HTTP::Client::VERSION = $CPAN::HTTP::Client::VERSION = "1.9601";
# CPAN::HTTP::Client is adapted from parts of cpanm by Tatsuhiko Miyagawa
# and parts of LWP by Gisle Aas
sub new {
my $class = shift;
my %args = @_;
for my $k ( keys %args ) {
$args{$k} = '' unless defined $args{$k};
}
$args{no_proxy} = [split(",", $args{no_proxy}) ] if $args{no_proxy};
return bless \%args, $class;
}
# This executes a request with redirection (up to 5) and returns the
# response structure generated by HTTP::Tiny
#
# If authentication fails, it will attempt to get new authentication
# information and repeat up to 5 times
sub mirror {
my($self, $uri, $path) = @_;
my $want_proxy = $self->_want_proxy($uri);
my $http = HTTP::Tiny->new(
$want_proxy ? (proxy => $self->{proxy}) : ()
);
my ($response, %headers);
my $retries = 0;
while ( $retries++ < 5 ) {
$response = $http->mirror( $uri, $path, {headers => \%headers} );
if ( $response->{status} eq '401' ) {
last unless $self->_get_auth_params( $response, 'non_proxy' );
}
elsif ( $response->{status} eq '407' ) {
last unless $self->_get_auth_params( $response, 'proxy' );
}
else {
last; # either success or failure
}
my %headers = (
$self->_auth_headers( $uri, 'non_proxy' ),
( $want_proxy ? $self->_auth_headers($uri, 'proxy') : () ),
);
}
return $response;
}
sub _want_proxy {
my ($self, $uri) = @_;
return unless $self->{proxy};
my($host) = $uri =~ m|://([^/:]+)|;
return ! grep { $host =~ /\Q$_\E$/ } @{ $self->{no_proxy} || [] };
}
# Generates the authentication headers for a given mode
# C<mode> is 'proxy' or 'non_proxy'
# C<_${mode}_type> is 'basic' or 'digest'
# C<_${mode}_params> will be the challenge parameters from the 401/407 headers
sub _auth_headers {
my ($self, $uri, $mode) = @_;
# Get names for our mode-specific attributes
my ($type_key, $param_key) = map {"_" . $mode . $_} qw/_type _params/;
# If _prepare_auth has not been called, we can't prepare headers
return unless $self->{$type_key};
# Get user credentials for mode
my $cred_method = "get_" . ($mode ? "proxy" : "non_proxy") ."_credentials";
my ($user, $pass) = CPAN::HTTP::Credentials->$cred_method;
# Generate the header for the mode & type
my $header = $mode eq 'proxy' ? 'Proxy-Authorization' : 'Authorization';
my $value_method = "_" . $self->{$type_key} . "_auth";
my $value = $self->$value_method($user, $pass, $self->{$param_key}, $uri);
# If we didn't get a value, we didn't have the right modules available
return $value ? ( $header, $value ) : ();
}
# Extract authentication parameters from headers, but clear any prior
# credentials if we failed (so we might prompt user for password again)
sub _get_auth_params {
my ($self, $response, $mode) = @_;
my $prefix = $mode eq 'proxy' ? 'Proxy' : 'WWW';
my ($type_key, $param_key) = map {"_" . $mode . $_} qw/_type _params/;
if ( ! $response->{success} ) { # auth failed
my $method = "clear_${mode}_credentials";
CPAN::HTTP::Credentials->$method;
delete $self->{$_} for $type_key, $param_key;
}
($self->{$type_key}, $self->{$param_key}) =
$self->_get_challenge( $response, "${prefix}-Authenticate");
return $self->{$type_key};
}
# Extract challenge type and parameters for a challenge list
sub _get_challenge {
my ($self, $response, $auth_header) = @_;
my $auth_list = $response->{headers}(lc $auth_header);
return unless defined $auth_list;
$auth_list = [$auth_list] unless ref $auth_list;
for my $challenge (@$auth_list) {
$challenge =~ tr/,/;/; # "," is used to separate auth-params!!
($challenge) = $self->split_header_words($challenge);
my $scheme = shift(@$challenge);
shift(@$challenge); # no value
$challenge = { @$challenge }; # make rest into a hash
unless ($scheme =~ /^(basic|digest)$/) {
next; # bad scheme
}
$scheme = $1; # untainted now
return ($scheme, $challenge);
}
return;
}
# Generate a basic authentication header value
sub _basic_auth {
my ($self, $user, $pass) = @_;
unless ( $CPAN::META->has_usable('MIME::Base64') ) {
$CPAN::Frontend->mywarn(
"MIME::Base64 is required for 'Basic' style authentication"
);
return;
}
return "Basic " . MIME::Base64::encode_base64("$user\:$pass", q{});
}
# Generate a digest authentication header value
sub _digest_auth {
my ($self, $user, $pass, $auth_param, $uri) = @_;
unless ( $CPAN::META->has_usable('Digest::MD5') ) {
$CPAN::Frontend->mywarn(
"Digest::MD5 is required for 'Digest' style authentication"
);
return;
}
my $nc = sprintf "%08X", ++$self->{_nonce_count}{$auth_param->{nonce}};
my $cnonce = sprintf "%8x", time;
my ($path) = $uri =~ m{^\w+?://[^/]+(/.*)$};
$path = "/" unless defined $path;
my $md5 = Digest::MD5->new;
my(@digest);
$md5->add(join(":", $user, $auth_param->{realm}, $pass));
push(@digest, $md5->hexdigest);
$md5->reset;
push(@digest, $auth_param->{nonce});
if ($auth_param->{qop}) {
push(@digest, $nc, $cnonce, ($auth_param->{qop} =~ m|^auth[,;]auth-int$|) ? 'auth' : $auth_param->{qop});
}
$md5->add(join(":", 'GET', $path));
push(@digest, $md5->hexdigest);
$md5->reset;
$md5->add(join(":", @digest));
my($digest) = $md5->hexdigest;
$md5->reset;
my %resp = map { $_ => $auth_param->{$_} } qw(realm nonce opaque);
@resp{qw(username uri response algorithm)} = ($user, $path, $digest, "MD5");
if (($auth_param->{qop} || "") =~ m|^auth([,;]auth-int)?$|) {
@resp{qw(qop cnonce nc)} = ("auth", $cnonce, $nc);
}
my(@order) =
qw(username realm qop algorithm uri nonce nc cnonce response opaque);
my @pairs;
for (@order) {
next unless defined $resp{$_};
push(@pairs, "$_=" . qq("$resp{$_}"));
}
my $auth_value = "Digest " . join(", ", @pairs);
return $auth_value;
}
# split_header_words adapted from HTTP::Headers::Util
sub split_header_words {
my ($self, @words) = @_;
my @res = $self->_split_header_words(@words);
for my $arr (@res) {
for (my $i = @$arr - 2; $i >= 0; $i -= 2) {
$arr->[$i] = lc($arr->[$i]);
}
}
return @res;
}
sub _split_header_words {
my($self, @val) = @_;
my @res;
for (@val) {
my @cur;
while (length) {
if (s/^\s*(=*[^\s=;,]+)//) { # 'token' or parameter 'attribute'
push(@cur, $1);
# a quoted value
if (s/^\s*=\s*\"([^\"\\]*(?:\\.[^\"\\]*)*)\"//) {
my $val = $1;
$val =~ s/\\(.)/$1/g;
push(@cur, $val);
# some unquoted value
}
elsif (s/^\s*=\s*([^;,\s]*)//) {
my $val = $1;
$val =~ s/\s+$//;
push(@cur, $val);
# no value, a lone token
}
else {
push(@cur, undef);
}
}
elsif (s/^\s*,//) {
push(@res, [@cur]) if @cur;
@cur = ();
}
elsif (s/^\s*;// || s/^\s+//) {
# continue
}
else {
die "This should not happen: '$_'";
}
}
push(@res, \@cur) if @cur;
}
@res;
}
1;
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