Sergei Poljanski
0fbb6ee809
One asset per invoice from a registry (lib/crypto_asset.rb): BTC, LTC, ETH, XMR, SOL, ALGO, USDT/USDC on ERC-20/TRC-20/BEP-20/Solana/Algorand. Migration 003 generalizes the ltc_* columns to crypto_* + crypto_coin (existing LTC invoices backfilled). QR payload adapts per asset: BIP21 amount URIs where supported, bare address for tokens with a network hint on the PDF. Default addresses come from the CRYPTO_ADDRESSES secret (JSON code=>address); LTC_ADDRESS still works as legacy.
33 lines
1.1 KiB
Ruby
33 lines
1.1 KiB
Ruby
require 'rqrcode'
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require_relative 'crypto_asset'
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# Renders a crypto payment QR as PNG bytes for embedding in the PDF.
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# The encoded payload depends on the asset (see CryptoAsset): a payment URI
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# with amount, a bare scheme URI, or just the address.
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module CryptoQr
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module_function
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# `amount` is a BigDecimal or nil (address-only QR).
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def uri(coin, address, amount)
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asset = CryptoAsset[coin] or return address
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return address unless asset[:scheme]
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base = "#{asset[:scheme]}:#{address}"
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return base if amount.nil? || asset[:amount_param].nil?
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# Trim trailing zeros so the wallet shows a clean amount; keep up to 8 dp.
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amt = amount.round(8).to_s('F').sub(/\.?0+$/, '')
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"#{base}?#{asset[:amount_param]}=#{amt}"
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end
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# Returns PNG bytes (binary string), sized for a crisp ~120pt PDF placement.
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def png(coin, address, amount, size: 480)
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qr = RQRCode::QRCode.new(uri(coin, address, amount), level: :m)
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qr.as_png(
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bit_depth: 1,
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border_modules: 2,
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color: 'black',
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fill: 'white',
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module_px_size: 6,
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resize_exactly_to: size
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).to_s
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end
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end
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