added on WebSTLs (webstls.com) at 2026-07-01 22:27:12
| 1 | #!/usr/bin/perl | |
| 2 | #====================================================================== | |
| 3 | # WebSTLs -- _tax_preview.cgi (JSON, GET) | |
| 4 | # | |
| 5 | # Async endpoint: the checkout page calls this when the buyer picks | |
| 6 | # a billing country/region so the cart total can show the right tax | |
| 7 | # amount BEFORE Stripe Elements collects payment. | |
| 8 | # | |
| 9 | # GET /_tax_preview.cgi?storefront_id=N&bill_country=DE&bill_region= | |
| 10 | # Returns: | |
| 11 | # { ok:1, subtotal_cents:..., tax_cents:..., total_cents:..., lines:[...] } | |
| 12 | # { ok:0, error:'message' } | |
| 13 | # | |
| 14 | # Reads the same cart cookie the checkout form will POST, so the | |
| 15 | # preview matches exactly what checkout_intent.cgi will compute. | |
| 16 | #====================================================================== | |
| 17 | use strict; | |
| 18 | use warnings; | |
| 19 | ||
| 20 | use lib '/var/www/vhosts/webstls.com/httpdocs'; | |
| 21 | use CGI; | |
| 22 | use JSON::PP; | |
| 23 | use MODS::DBConnect; | |
| 24 | use MODS::WebSTLs::Config; | |
| 25 | use MODS::WebSTLs::Cart; | |
| 26 | use MODS::WebSTLs::Promotions; | |
| 27 | use MODS::WebSTLs::Tax; | |
| 28 | ||
| 29 | my $q = CGI->new; | |
| 30 | my $form = $q->Vars; | |
| 31 | my $db = MODS::DBConnect->new; | |
| 32 | my $cfg = MODS::WebSTLs::Config->new; | |
| 33 | my $cart = MODS::WebSTLs::Cart->new; | |
| 34 | my $tax = MODS::WebSTLs::Tax->new; | |
| 35 | my $promo = MODS::WebSTLs::Promotions->new; | |
| 36 | my $DB = $cfg->settings('database_name'); | |
| 37 | ||
| 38 | sub _json { | |
| 39 | my ($h, $status) = @_; | |
| 40 | $status ||= '200 OK'; | |
| 41 | print "Status: $status\nContent-Type: application/json; charset=utf-8\nCache-Control: no-store\n\n"; | |
| 42 | print JSON::PP::encode_json($h); | |
| 43 | exit; | |
| 44 | } | |
| 45 | ||
| 46 | my $sid = $form->{storefront_id} || 0; $sid =~ s/[^0-9]//g; | |
| 47 | _json({ ok => 0, error => 'storefront required' }) unless $sid; | |
| 48 | ||
| 49 | my $bc = uc($form->{bill_country} || ''); $bc =~ s/[^A-Z]//g; $bc = substr($bc, 0, 2); | |
| 50 | my $br = uc($form->{bill_region} || ''); $br =~ s/[^A-Z0-9]//g; $br = substr($br, 0, 10); | |
| 51 | my $vat_id = uc($form->{vat_id} || ''); $vat_id =~ s/[^A-Z0-9]//g; $vat_id = substr($vat_id, 0, 20); | |
| 52 | ||
| 53 | my $dbh = $db->db_connect(); | |
| 54 | _json({ ok => 0, error => 'db' }) unless $dbh; | |
| 55 | ||
| 56 | my $token = $cart->read_token($q); | |
| 57 | my @rows = $cart->items($db, $dbh, $DB, $token, $sid); | |
| 58 | my $subtotal = $cart->total_cents($db, $dbh, $DB, $token, $sid); | |
| 59 | ||
| 60 | unless (@rows && $subtotal > 0) { | |
| 61 | $db->db_disconnect($dbh); | |
| 62 | _json({ ok => 1, subtotal_cents => 0, tax_cents => 0, total_cents => 0, lines => [] }); | |
| 63 | } | |
| 64 | ||
| 65 | # Re-apply current promo so the preview is in lockstep with what | |
| 66 | # checkout_intent.cgi will compute on submit. | |
| 67 | my $applied = $promo->cart_applied($db, $dbh, $DB, $token, $sid); | |
| 68 | my $discount_cents = 0; | |
| 69 | if ($applied) { | |
| 70 | my %v = $promo->validate($db, $dbh, $DB, $applied, | |
| 71 | kind => 'model', | |
| 72 | subtotal_cents => $subtotal, | |
| 73 | buyer_email => '', | |
| 74 | new_customer => 1, | |
| 75 | ); | |
| 76 | $discount_cents = $promo->apply_to_total_cents($applied, $subtotal) if $v{ok}; | |
| 77 | } | |
| 78 | my $after_discount = $subtotal - $discount_cents; | |
| 79 | $after_discount = 0 if $after_discount < 0; | |
| 80 | ||
| 81 | # Dominant product kind across the cart -- same logic as checkout_intent. | |
| 82 | my $kind = 'digital'; | |
| 83 | { | |
| 84 | my $has_physical = 0; | |
| 85 | foreach my $r (@rows) { | |
| 86 | my $mid = $r->{model_id} || 0; $mid =~ s/[^0-9]//g; | |
| 87 | next unless $mid; | |
| 88 | my $m = $db->db_readwrite($dbh, qq~ | |
| 89 | SELECT product_kind FROM `${DB}`.models WHERE id='$mid' LIMIT 1 | |
| 90 | ~, $ENV{SCRIPT_NAME}, __LINE__); | |
| 91 | if ($m && $m->{product_kind} && $m->{product_kind} ne 'digital') { | |
| 92 | $has_physical = 1; last; | |
| 93 | } | |
| 94 | } | |
| 95 | $kind = $has_physical ? 'physical' : 'digital'; | |
| 96 | } | |
| 97 | ||
| 98 | # B2B reverse-charge check: if a previously-VIES-validated VAT ID | |
| 99 | # matches what the buyer typed, set reverse_charge so the tax line | |
| 100 | # is zero-amount but still records the audit trail. | |
| 101 | my $reverse_charge = 0; | |
| 102 | my ($vat_country, $vat_id_clean) = ('', ''); | |
| 103 | if (length $vat_id >= 4) { | |
| 104 | my $cached = $db->db_readwrite($dbh, qq~ | |
| 105 | SELECT vat_country, is_valid, | |
| 106 | DATEDIFF(NOW(), validated_at) AS age | |
| 107 | FROM `${DB}`.buyer_tax_info | |
| 108 | WHERE vat_id='~ . (do { my $v = $vat_id; $v =~ s/'/''/g; $v }) . qq~' | |
| 109 | ORDER BY id DESC LIMIT 1 | |
| 110 | ~, $ENV{SCRIPT_NAME}, __LINE__); | |
| 111 | if ($cached && $cached->{is_valid} && defined $cached->{age} && $cached->{age} < 180) { | |
| 112 | $reverse_charge = 1; | |
| 113 | $vat_country = $cached->{vat_country}; | |
| 114 | $vat_id_clean = $vat_id; | |
| 115 | } | |
| 116 | } | |
| 117 | ||
| 118 | my @lines; | |
| 119 | my $tax_cents = 0; | |
| 120 | if (length $bc == 2 && $after_discount > 0) { | |
| 121 | @lines = $tax->calc_tax_lines( | |
| 122 | db => $db, | |
| 123 | dbh => $dbh, | |
| 124 | DB => $DB, | |
| 125 | storefront_id => $sid, | |
| 126 | country_iso2 => $bc, | |
| 127 | region_code => $br, | |
| 128 | product_kind => $kind, | |
| 129 | taxable_amount_cents => $after_discount, | |
| 130 | reverse_charge => $reverse_charge, | |
| 131 | buyer_vat_id => $vat_id_clean, | |
| 132 | buyer_vat_country => $vat_country, | |
| 133 | evidence => { buyer_country_billing => $bc }, | |
| 134 | ); | |
| 135 | foreach my $l (@lines) { $tax_cents += ($l->{tax_amount_cents} || 0); } | |
| 136 | } | |
| 137 | ||
| 138 | $db->db_disconnect($dbh); | |
| 139 | ||
| 140 | my @out_lines; | |
| 141 | foreach my $l (@lines) { | |
| 142 | push @out_lines, { | |
| 143 | label => $l->{jurisdiction_label}, | |
| 144 | rate => sprintf('%.2f', $l->{rate_pct}) + 0, | |
| 145 | cents => $l->{tax_amount_cents} + 0, | |
| 146 | }; | |
| 147 | } | |
| 148 | ||
| 149 | _json({ | |
| 150 | ok => 1, | |
| 151 | subtotal_cents => $subtotal + 0, | |
| 152 | discount_cents => $discount_cents + 0, | |
| 153 | tax_cents => $tax_cents + 0, | |
| 154 | total_cents => ($after_discount + $tax_cents) + 0, | |
| 155 | lines => \@out_lines, | |
| 156 | reverse_charge => $reverse_charge ? 1 : 0, | |
| 157 | }); |