Koha::Token - Tokenizer
    use Koha::Token;
    my $tokenizer = Koha::Token->new;
    my $token = $tokenizer->generate({ length => 20 });
    # safely generate a CSRF token (nonblocking)
    my $csrf_token = $tokenizer->generate({
        type => 'CSRF', id => $id, secret => $secret,
    });
    # generate/check CSRF token with defaults and session id
    my $csrf_token = $tokenizer->generate_csrf({ session_id => $x });
    my $result = $tokenizer->check_csrf({
        session_id => $x, token => $token,
    });
    Designed for providing general tokens.
    Created due to the need for a nonblocking call to Bytes::Random::Secure
    when generating a CSRF token.
Create object (via Class::Accessor).
    my $token = $tokenizer->generate({ length => 20 });
    my $csrf_token = $tokenizer->generate({
        type => 'CSRF', id => $id, secret => $secret,
    });
    Generate several types of tokens. Now includes CSRF.
    For non-CSRF tokens an optional pattern parameter overrides length.
    Room for future extension.
    Pattern parameter could be write down using this subset of regular expressions:
    \w    Alphanumeric + "_".
    \d    Digits.
    \W    Printable characters other than those in \w.
    \D    Printable characters other than those in \d.
    .     Printable characters.
    []    Character classes.
    {}    Repetition.
    *     Same as {0,}.
    ?     Same as {0,1}.
    +     Same as {1,}.
    Like: generate({ type => 'CSRF', ... })
    Note: id defaults to userid from context, secret to database password.
    session_id is mandatory; it is combined with id.
    my $result = $tokenizer->check({
        type => 'CSRF', id => $id, token => $token,
    });
    Check several types of tokens. Now includes CSRF.
    Room for future extension.
    Like: check({ type => 'CSRF', ... })
    Note: id defaults to userid from context, secret to database password.
    session_id is mandatory; it is combined with id.
Marcel de Rooy, Rijksmuseum Amsterdam, The Netherlands