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#  Copyright 2014 - present MongoDB, Inc.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

use strict;
use warnings;

package MongoDB::_Credential;

use version;
our $VERSION = 'v2.0.2';

use Moo;
use MongoDB::Error;
use MongoDB::Op::_Command;
use MongoDB::_Types qw(
  AuthMechanism
  NonEmptyStr
);

use Digest::MD5 qw/md5_hex/;
use Encode qw/encode/;
use MIME::Base64 qw/encode_base64 decode_base64/;
use Safe::Isa;
use Tie::IxHash;
use Try::Tiny;
use MongoDB::_Types qw(
    Boolish
);
use Types::Standard qw(
  CodeRef
  HashRef
  InstanceOf
  Maybe
  Str
);

use namespace::clean -except => 'meta';

# Required so we're sure it's passed explicitly, even if undef, so we don't
# miss wiring it up.
has monitoring_callback => (
    is => 'ro',
    required => 1,
    isa => Maybe[CodeRef],
);

has mechanism => (
    is       => 'ro',
    isa      => AuthMechanism,
    required => 1,
);

has username => (
    is      => 'ro',
    isa     => Str,
    default => '',
);

has source => (
    is      => 'lazy',
    isa     => NonEmptyStr,
    builder => '_build_source',
);

has password => (
    is      => 'ro',
    isa     => Str,
    default => '',
);

has pw_is_digest => (
    is  => 'ro',
    isa => Boolish,
);

has mechanism_properties => (
    is      => 'ro',
    isa     => HashRef,
    default => sub { {} },
);

has _digested_password => (
    is      => 'lazy',
    isa     => Str,
    builder => '_build__digested_password',
);

has _scram_sha1_client => (
    is      => 'lazy',
    isa     => InstanceOf ['Authen::SCRAM::Client'],
    builder => '_build__scram_sha1_client',
);

has _scram_sha256_client => (
    is      => 'lazy',
    isa     => InstanceOf ['Authen::SCRAM::Client'],
    builder => '_build__scram_sha256_client',
);

sub _build__scram_sha1_client {
    my ($self) = @_;
    # loaded only demand as it has a long load time relative to other
    # modules
    require Authen::SCRAM::Client;
    Authen::SCRAM::Client->VERSION(0.011);
    return Authen::SCRAM::Client->new(
        username                => $self->username,
        password                => $self->_digested_password,
        digest                  => 'SHA-1',
        minimum_iteration_count => 4096,
        skip_saslprep           => 1,
    );
}

sub _build__scram_sha256_client {
    my ($self) = @_;
    # loaded only demand as it has a long load time relative to other
    # modules
    require Authen::SCRAM::Client;
    Authen::SCRAM::Client->VERSION(0.007);
    require Authen::SASL::SASLprep;
    return Authen::SCRAM::Client->new(
        username                => $self->username,
        password                => Authen::SASL::SASLprep::saslprep($self->password),
        digest                  => 'SHA-256',
        minimum_iteration_count => 4096,
        skip_saslprep           => 1,
    );
}

sub _build__digested_password {
    my ($self) = @_;
    return $self->password if $self->pw_is_digest;
    return md5_hex( encode( "UTF-8", $self->username . ":mongo:" . $self->password ) );
}

sub _build_source {
    my ($self) = @_;
    my $mech = $self->mechanism;
    return
      $mech eq 'MONGODB-X509' || $mech eq 'PLAIN' || $mech eq 'GSSAPI'
      ? '$external'
      : 'admin';
}

#<<< No perltidy
my %CONSTRAINTS = (
    'MONGODB-CR' => {
        username             => sub { length },
        password             => sub { length },
        source               => sub { length },
        mechanism_properties => sub { !keys %$_ },
    },
    'MONGODB-X509' => {
        password             => sub { ! length },
        source               => sub { $_ eq '$external' },
        mechanism_properties => sub { !keys %$_ },
    },
    'GSSAPI'      => {
        username             => sub { length },
        source               => sub { $_ eq '$external' },
    },
    'PLAIN'       => {
        username             => sub { length },
        password             => sub { length },
        source               => sub { $_ eq '$external' },
        mechanism_properties => sub { !keys %$_ },
    },
    'SCRAM-SHA-1' => {
        username             => sub { length },
        password             => sub { length },
        source               => sub { length },
        mechanism_properties => sub { !keys %$_ },
    },
    'SCRAM-SHA-256' => {
        username             => sub { length },
        password             => sub { length },
        source               => sub { length },
        mechanism_properties => sub { !keys %$_ },
    },
    'DEFAULT' => {
        username             => sub { length },
        password             => sub { length },
        source               => sub { length },
        mechanism_properties => sub { !keys %$_ },
    },
);
#>>>

sub BUILD {
    my ($self) = @_;

    my $mech = $self->mechanism;

    # validate attributes for given mechanism
    for my $key ( sort keys %{ $CONSTRAINTS{$mech} } ) {
        my $validator = $CONSTRAINTS{$mech}{$key};
        local $_ = $self->$key;
        unless ( $validator->() ) {
            MongoDB::UsageError->throw("invalid field $key in $mech credential");
        }
    }

    # fix up GSSAPI property defaults if not given
    if ( $mech eq 'GSSAPI' ) {
        my $mp = $self->mechanism_properties;
        $mp->{SERVICE_NAME} ||= 'mongodb';
    }

    return;
}

sub authenticate {
    my ( $self, $server, $link, $bson_codec ) = @_;

    my $mech = $self->mechanism;
    if ( $mech eq 'DEFAULT' ) {
        $mech = $self->_get_default_mechanism($server, $link);
    }
    my $method = "_authenticate_$mech";
    $method =~ s/-/_/g;

    return $self->$method( $link, $bson_codec );
}

#--------------------------------------------------------------------------#
# authentication mechanisms
#--------------------------------------------------------------------------#

sub _authenticate_NONE () { 1 }

sub _authenticate_MONGODB_CR {
    my ( $self, $link, $bson_codec ) = @_;

    my $nonce = $self->_send_command( $link, $bson_codec, 'admin', { getnonce => 1 } )
      ->output->{nonce};
    my $key =
      md5_hex( encode( "UTF-8", $nonce . $self->username . $self->_digested_password ) );

    my $command = Tie::IxHash->new(
        authenticate => 1,
        user         => $self->username,
        nonce        => $nonce,
        key          => $key
    );
    $self->_send_command( $link, $bson_codec, $self->source, $command );

    return 1;
}

sub _authenticate_MONGODB_X509 {
    my ( $self, $link, $bson_codec ) = @_;

    my $username = $self->username;

    if ( !$username && !$link->supports_x509_user_from_cert ) {
        $username = $link->client_certificate_subject
          or MongoDB::UsageError->throw(
            "Could not extract subject from client SSL certificate");
    }

    my $command = Tie::IxHash->new(
        authenticate => 1,
        mechanism    => "MONGODB-X509",
        ( $username ? ( user => $username ) : () ),
    );
    $self->_send_command( $link, $bson_codec, $self->source, $command );

    return 1;
}

sub _authenticate_PLAIN {
    my ( $self, $link, $bson_codec ) = @_;

    my $auth_bytes =
      encode( "UTF-8", "\x00" . $self->username . "\x00" . $self->password );
    $self->_sasl_start( $link, $bson_codec, $auth_bytes, "PLAIN" );

    return 1;
}

sub _authenticate_GSSAPI {
    my ( $self, $link, $bson_codec ) = @_;

    eval { require Authen::SASL; 1 }
      or MongoDB::AuthError->throw(
        "GSSAPI requires Authen::SASL and GSSAPI or Authen::SASL::XS from CPAN");

    my ( $sasl, $client );
    try {
        $sasl = Authen::SASL->new(
            mechanism => 'GSSAPI',
            callback  => {
                user     => $self->username,
                authname => $self->username,
            },
        );
        $client =
          $sasl->client_new( $self->mechanism_properties->{SERVICE_NAME}, $link->host );
    }
    catch {
        MongoDB::AuthError->throw(
            "Failed to initialize a GSSAPI backend (did you install GSSAPI or Authen::SASL::XS?) Error was: $_"
        );
    };

    try {
        # start conversation
        my $step = $client->client_start;
        $self->_assert_gssapi( $client,
            "Could not start GSSAPI. Did you run kinit?  Error was: " );
        my ( $sasl_resp, $conv_id, $done ) =
          $self->_sasl_start( $link, $bson_codec, $step, 'GSSAPI' );

        # iterate, but with maximum number of exchanges to prevent endless loop
        for my $i ( 1 .. 10 ) {
            last if $done;
            $step = $client->client_step($sasl_resp);
            $self->_assert_gssapi( $client, "GSSAPI step error: " );
            ( $sasl_resp, $conv_id, $done ) =
              $self->_sasl_continue( $link, $bson_codec, $step, $conv_id );
        }
    }
    catch {
        my $msg = $_->$_isa("MongoDB::Error") ? $_->message : "$_";
        MongoDB::AuthError->throw("GSSAPI error: $msg");
    };

    return 1;
}

sub _authenticate_SCRAM_SHA_1 {
    my $self = shift;

    $self->_scram_auth(@_, $self->_scram_sha1_client, 'SCRAM-SHA-1');

    return 1;
}

sub _authenticate_SCRAM_SHA_256 {
    my $self = shift;

    $self->_scram_auth(@_, $self->_scram_sha256_client, 'SCRAM-SHA-256');

    return 1;
}

sub _get_default_mechanism {
    my ( $self, $server, $link ) = @_;

    if ( my $supported = $server->is_master->{saslSupportedMechs} ) {
        if ( grep { $_ eq 'SCRAM-SHA-256' } @$supported ) {
            return 'SCRAM-SHA-256';
        }
        return 'SCRAM-SHA-1';
    }

    if ( $link->supports_scram_sha1 ) {
        return 'SCRAM-SHA-1';
    }

    return 'MONGODB-CR';
}

#--------------------------------------------------------------------------#
# GSSAPI/SASL methods
#--------------------------------------------------------------------------#

# GSSAPI backends report status/errors differently
sub _assert_gssapi {
    my ( $self, $client, $prefix ) = @_;
    my $type = ref $client;

    if ( $type =~ m{^Authen::SASL::(?:XS|Cyrus)$} ) {
        my $code = $client->code;
        if ( $code != 0 && $code != 1 ) { # not OK or CONTINUE
            my $error = join( "; ", $client->error );
            MongoDB::AuthError->throw("$prefix$error");
        }
    }
    else {
        # Authen::SASL::Perl::GSSAPI or some unknown backend
        if ( my $error = $client->error ) {
            MongoDB::AuthError->throw("$prefix$error");
        }
    }

    return 1;
}

# PERL-801: GSSAPI broke in some cases after switching to binary
# payloads, so fall back to base64 encoding for that mechanism.
sub _sasl_encode_payload {
    my ( $self, $payload ) = @_;
    $payload = "" unless defined $payload;
    return encode_base64( $payload, "" ) if $self->mechanism eq 'GSSAPI';
    $payload = encode( "UTF-8", $payload );
    return \$payload;
}

sub _sasl_decode_payload {
    my ( $self, $payload ) = @_;
    return "" unless defined $payload && length $payload;
    return $payload->data if ref $payload;
    return decode_base64($payload);
}

sub _sasl_start {
    my ( $self, $link, $bson_codec, $payload, $mechanism ) = @_;

    my $command = Tie::IxHash->new(
        saslStart     => 1,
        mechanism     => $mechanism,
        payload       => $self->_sasl_encode_payload($payload),
        autoAuthorize => 1,
    );

    return $self->_sasl_send( $link, $bson_codec, $command );
}

sub _sasl_continue {
    my ( $self, $link, $bson_codec, $payload, $conv_id ) = @_;

    my $command = Tie::IxHash->new(
        saslContinue   => 1,
        conversationId => $conv_id,
        payload        => $self->_sasl_encode_payload($payload),
    );

    return $self->_sasl_send( $link, $bson_codec, $command );
}

sub _sasl_send {
    my ( $self, $link, $bson_codec, $command ) = @_;
    my $output =
      $self->_send_command( $link, $bson_codec, $self->source, $command )->output;

    return (
        $self->_sasl_decode_payload( $output->{payload} ),
        $output->{conversationId},
        $output->{done}
    );
}

sub _scram_auth {
    my ( $self, $link, $bson_codec, $client, $mech ) = @_;

    my ( $msg, $sasl_resp, $conv_id, $done );
    try {
        $msg = $client->first_msg;
        ( $sasl_resp, $conv_id, $done ) =
          $self->_sasl_start( $link, $bson_codec, $msg, $mech );
        $msg = $client->final_msg($sasl_resp);
        ( $sasl_resp, $conv_id, $done ) =
          $self->_sasl_continue( $link, $bson_codec, $msg, $conv_id );
        $client->validate($sasl_resp);
        # might require an empty payload to complete SASL conversation
        $self->_sasl_continue( $link, $bson_codec, "", $conv_id ) if !$done;
    }
    catch {
        my $msg = $_->$_isa("MongoDB::Error") ? $_->message : "$_";
        MongoDB::AuthError->throw("$mech error: $msg");
    };
}

sub _send_command {
    my ( $self, $link, $bson_codec, $db_name, $command ) = @_;

    my $op = MongoDB::Op::_Command->_new(
        db_name             => $db_name,
        query               => $command,
        query_flags         => {},
        bson_codec          => $bson_codec,
        monitoring_callback => $self->monitoring_callback,
    );
    my $res = $op->execute($link);
    return $res;
}

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