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ltc payments

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This commit is contained in:
Sergei Poljanski 2026-06-08 18:43:01 +03:00
commit c9bcbe7ff5
Signed by: asxpi
GPG key ID: 4F8851660FA4121B
12 changed files with 338 additions and 2 deletions
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65
lib/invoice_pdf.rb
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@ -1,6 +1,7 @@
require 'prawn'
require 'prawn/table'
require 'bigdecimal'
require 'stringio'
class InvoicePdf
FONTS_DIR = File.join($root, 'public', 'fonts')
@ -233,6 +234,9 @@ class InvoicePdf
pdf.text "SWIFT: #{ISSUER[:swift]}"
pdf.text "Beneficiary: #{ISSUER[:name_latin]}"
end
draw_ltc(pdf) if @invoice.respond_to?(:ltc?) && @invoice.ltc?
unless @invoice.notes.to_s.strip.empty?
pdf.move_down 14
pdf.fill_color COLOR_MUTED
@ -243,7 +247,51 @@ class InvoicePdf
end
end
def draw_ltc(pdf)
amount = @invoice.ltc_amount_due
qr_size = 78
pdf.move_down 12
pdf.fill_color COLOR_MUTED
pdf.font_size(8) { pdf.text 'PAY IN LITECOIN (LTC)', character_spacing: 1.5 }
pdf.fill_color COLOR_TEXT
pdf.move_down 4
# Fixed-height row: QR on the right (drawn with float so it doesn't advance
# the cursor), text column on the left. The outer bounding_box of height
# qr_size leaves the cursor exactly below the row when it ends.
qr_bytes = LtcQr.png(@invoice.ltc_address, amount)
pdf.bounding_box([0, pdf.cursor], width: pdf.bounds.width, height: qr_size) do
pdf.float do
pdf.bounding_box([pdf.bounds.right - qr_size, pdf.bounds.top], width: qr_size, height: qr_size) do
pdf.image StringIO.new(qr_bytes), width: qr_size, height: qr_size
end
end
pdf.bounding_box([0, pdf.bounds.top], width: pdf.bounds.width - qr_size - 16) do
pdf.font_size(9) do
if amount
pdf.text "Amount: #{fmt_ltc(amount)} LTC", style: :bold
if @invoice.ltc_rate
pdf.fill_color COLOR_MUTED
pdf.text "(rate 1 LTC = #{fmt_money(@invoice.ltc_rate)} #{@invoice.currency} at issue)", size: 8
pdf.fill_color COLOR_TEXT
end
pdf.move_down 3
end
pdf.text 'Address:'
pdf.font_size(8) { pdf.text @invoice.ltc_address }
pdf.move_down 3
pdf.fill_color COLOR_MUTED
pdf.font_size(7) { pdf.text 'Scan the QR with any Litecoin wallet to prefill the payment.' }
pdf.fill_color COLOR_TEXT
end
end
end
end
def draw_footer(pdf)
# Static left-side line repeats on every page.
pdf.repeat(:all) do
pdf.canvas do
pdf.fill_color COLOR_MUTED
@ -252,17 +300,32 @@ class InvoicePdf
"#{ISSUER[:name_latin]} · Tax ID #{ISSUER[:tax_id]} · Small Business (1% turnover tax)",
at: [50, 25]
)
pdf.draw_text("Page #{pdf.page_number}", at: [pdf.bounds.right - 50, 25])
end
pdf.fill_color COLOR_TEXT
end
end
# Page number must be stamped per page: inside repeat(:all), pdf.page_number
# resolves to the final page count for every page. number_pages substitutes
# <page>/<total> at finalization, once per actual page.
pdf.number_pages(
'Page <page> of <total>',
at: [pdf.bounds.right - 90, -25],
width: 90,
align: :right,
size: 8,
color: COLOR_MUTED
)
end
def fmt_money(value)
BigDecimal(value.to_s).round(2).to_s('F').then { |s| with_thousands(s) }
end
def fmt_ltc(value)
BigDecimal(value.to_s).round(8).to_s('F').sub(/(\.\d*?)0+$/, '\\1').sub(/\.$/, '')
end
def fmt_qty(value)
bd = BigDecimal(value.to_s)
bd.frac.zero? ? bd.to_i.to_s : bd.to_s('F')