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ActionHandler.pm
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ActionHandler.pm
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package Labipay::ActionHandler;
use Labipay::Funcs;
use Labipay::Auth;
use DBI;
use Lingua::EN::Numbers qw(num2en_ordinal);
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(handle);
use strict;
use warnings;
# handle()
#
# Perform any actions from input forms
#
# Arguments:
# cgi - a CGI object
# dbh - a database handle
# user - a hashref that represents the current user (undef if
# no user is logged in)
# actions - a hashref - keys: the names of actions to handle
# values: the page to send to on input errors
# (undef means just return)
#
# Returns:
# A hashref - keys: the names of the handled actions
# values: a hashref with
# status - true on ok, false on fail
# text - a string with any response to
# the user (e.g. ok/error)
#
# Notes:
# On database errors, the error() function is called
sub handle {
my ($cgi, $dbh, $user, $actions) = @_;
my $res = {};
my $action = $cgi->param("action");
unless ($cgi and $dbh and $actions){
error(500, "Wrong arguments to handle()");
}
# See whether we have anything to do
return $res unless ( $action and exists $actions->{$action} );
if ($action eq 'transfer') {
_handle_transfer($res, @_);
}
elsif ($action eq 'create_account') {
_create_account($res, @_);
}
elsif ($action eq 'create_shop') {
_create_shop($res, @_);
}
return $res;
}
####
#
# TRANSFER
#
####
sub _handle_transfer {
my ($res, $cgi, $dbh, $user, $actions) = @_;
# Check that we have a logged in user
unless ($user->{id}) {
return _fail( 'transfer',
$actions,
$res,
$cgi,
'<p class="error">Could not transfer: No user is logged in</p>');
}
# Check permission
unless (permission($user->{id}, 'admin', $dbh)) {
my $sth = $dbh->prepare("SELECT * FROM account WHERE number=?")
or error(500, "Database error: " . $dbh->errstr);
$sth->execute( $cgi->param("from_account") )
or error(500, "Database error: " . $dbh->errstr);
my $row = $sth->fetchrow_hashref;
unless ($row->{owner} == $user->{id}) {
return _fail( 'transfer',
$actions,
$res,
$cgi,
'<p class="error">You are now allowed to transfer from that account!</p>');
}
}
# Clean up amount
my $amount = $cgi->param("amount") || '';
$amount =~ s/[^0-9\,\.\-]//g;
# Handle different commas
if ($amount =~ m/\d\,\d\d\d(\.\d\d)$/){
$amount =~ s/\,//g;
}
elsif ( $amount =~ m/\d\.\d\d\d(\,\d\d)$/
or $amount =~ m/^\d*\,\d\d?$/){
$amount =~ s/\./=/;
$amount =~ s/\,/./;
$amount =~ s/=/,/;
}
# Force to be a valid number
{
no strict;
no warnings;
$amount += 0;
}
# Is the amount zero (or 0.00 etc)?
if ( $amount == 0) {
return _fail( 'transfer',
$actions,
$res,
$cgi,
qq|<p class="error">Please fill out the amount field with a valid number</p>|);
}
elsif ( $amount < 0 ) {
return _fail( 'transfer',
$actions,
$res,
$cgi,
'<p class="error">No, you cannot transfer a negative amount. How stupid do you think we are?</p>');
}
elsif ( $cgi->param("from_account") == $cgi->param("to_account") ) {
return _fail( 'transfer',
$actions,
$res,
$cgi,
'<p class="error">It does not make sense to transfer from an account to itself. Please choose another account.</p>');
}
# Make the transfer as a transaction
$dbh->do("start transaction")
or error(500, "Database error: " . $dbh->errstr);
$dbh->do("update account set balance = balance - ? where number = ?",
undef,
$amount,
$cgi->param("from_account"))
or _rollback_and_die($dbh);
$dbh->do("update account set balance = balance + ? where number = ?",
undef,
$amount,
$cgi->param("to_account"))
or _rollback_and_die($dbh);
$dbh->do("insert into transfer (from_account, to_account, amount) values (?, ?, ?)",
undef,
$cgi->param("from_account"),
$cgi->param("to_account"),
$amount
)
or _rollback_and_die($dbh);
$dbh->do("commit")
or error(500, "Database error - could not commit: " . $dbh->errstr);
$res->{transfer} = { status => 1,
text => qq|<p class="good">$amount was transferred</p>|,
};
}
####
#
# CREATE ACCOUNT
#
####
sub _create_account {
my ($res, $cgi, $dbh, $user, $actions) = @_;
# Check that we have a logged in user
unless ($user->{id}) {
return _fail( 'create_account',
$actions,
$res,
$cgi,
'<p class="error">Could not create account: No user is logged in</p>');
}
my $name = $cgi->param("new_account_name");
unless ($name) {
my $sth = $dbh->prepare("SELECT COUNT(number) FROM account WHERE owner = ?");
if ($sth and $sth->execute("$user->{id}")) {
my $count = $sth->fetchrow_arrayref->[0];
$name = ucfirst(num2en_ordinal($count+1));
}
}
$name ||= 'New';
$dbh->do("insert into account (name, owner) VALUES (?, ?)",
undef,
$name,
$user->{id}
)
or error(500, "Database error - could not create account: " . $dbh->errstr);
$res->{create_shop} = { status => 1,
text => qq|<p class="good">Account "$name" was created</p>|,
};
}
####
#
# CREATE SHOP
#
####
sub _create_shop {
my ($res, $cgi, $dbh, $user, $actions) = @_;
my $add_id_to_name = 0;
# Check that we have a logged in user
unless ($user->{id}) {
return _fail( 'create_shop',
$actions,
$res,
$cgi,
'<p class="error">Could not create shop: No user is logged in</p>');
}
my $name = $cgi->param("new_shop_name");
my $account = $cgi->param("new_shop_account");
# Default name
unless ($name) {
$name = '' . ($user->{handle}//'Labitat') . "'s new shop";
$add_id_to_name = 1;
}
# Account number check
if ($account) {
# Check that the account exists
$account =~ s/\D//g;
my $sth = $dbh->prepare("SELECT * FROM account WHERE number = ?");
unless ( $sth and $sth->execute($account) ) {
error(500, "Could not verify account number '$account'");
}
}
else {
# Select the user's standard account
my $sth = $dbh->prepare("SELECT * FROM account WHERE owner = ? ORDER BY standard DESC, number ASC");
unless ($sth and $sth->execute($user->{id})){
error( 500, "Could not find an account to use with the shop: " . $dbh->errstr);
}
my $row = $sth->fetchrow_hashref;
unless ($row) {
return _fail( 'create_shop',
$actions,
$res,
$cgi,
'<p class="error">You do not have any accounts!</p>'
);
}
$account = $row->{number};
}
$dbh->do("start transaction")
or error(500, "Database error: " . $dbh->errstr);
$dbh->do("insert into shop (name, account) values (?, ?)",
undef,
$name,
$account
)
or _rollback_and_die($dbh);
my $sth = $dbh->prepare("SELECT LAST_INSERT_ID()");
unless ($sth and $sth->execute()){
_rollback_and_die($dbh);
}
my $shop_id = $sth->fetchrow_arrayref->[0];
unless ($shop_id){
_rollback_and_die($dbh, "Could not get shop ID");
}
if ($add_id_to_name) {
$dbh->do("UPDATE shop SET name = CONCAT(name, ' (', ?, ')') WHERE id = ?",
undef,
$shop_id,
$shop_id
)
or _rollback_and_die($dbh, "Could not change name for shop $shop_id");
}
$dbh->do("INSERT INTO shop_admin (shop, person) VALUES (?,?)",
undef,
$shop_id,
$user->{id}
)
or _rollback_and_die($dbh, "Could not add admin to shop. Giving up");
$dbh->do("commit")
or error(500, "Database error - could not commit: " . $dbh->errstr);
$res->{create_account} = { status => 1,
text => qq|<p class="good">Account "$name" was created</p>|,
};
}
# _fail()
#
# Internal function, handles failure
#
# Arguments:
# action - string with the current action
# actions - incoming hash with actions
# res - a hashref to the result hashref
# cgi - the cgi object
# text - an error message (string)
#
# Returns:
# The result hashref
#
# Notes:
# If an error page is given, calls that error page and exits!
#
sub _fail {
my ($action, $actions, $res, $cgi, $text) = @_;
$res->{$action}->{status} = 0;
$res->{$action}->{text} = $text;
unless ($actions->{$action}) {
return $res;
}
# TODO: Return to proper page
error(401, $text);
}
# _rollback_and_die()
#
# Makes a transaction rollback and calls error()
#
# Arguments:
# dbh - a database handle
# [msg] - a message string (optional, default 'Database error')
#
# Returns:
# Never returns, exits
#
# Notes:
# None
sub _rollback_and_die {
my ($dbh, $msg) = @_;
$msg //= 'Database error';
my $errstr = $dbh->errstr;
$dbh->do("rollback")
or error(500,
sprintf("Database error - could not even rollback: %s (original error was: %s - %s)",
$dbh->errstr,
$msg,
$errstr)
);
error(500, "$msg: $errstr<br/>Rolled back");
}