add QR image upload to send pages

apps/desktop/src/lib/components/qr-upload.svelte

@@ -0,0 +1,62 @@
+<script lang="ts">
+	import { Button } from '$lib/components/ui/button/index.js'
+	import Loader from '$lib/components/loader.svelte'
+	import QrCodeIcon from '@lucide/svelte/icons/qr-code'
+	import { decodeQrFromFile } from '$lib/qr.js'
+
+	let {
+		onDecode,
+		disabled = false,
+	}: {
+		onDecode: (text: string) => void
+		disabled?: boolean
+	} = $props()
+
+	let fileInput: HTMLInputElement
+	let busy = $state(false)
+	let error = $state('')
+
+	const handleFile = async (e: Event) => {
+		const file = (e.target as HTMLInputElement).files?.[0]
+		if (!file) return
+		busy = true
+		error = ''
+		try {
+			const text = await decodeQrFromFile(file)
+			if (!text) throw new Error('No QR code found in the image')
+			onDecode(text)
+		} catch (err) {
+			error = err instanceof Error ? err.message : 'Failed to read QR code'
+		} finally {
+			busy = false
+			if (fileInput) fileInput.value = ''
+		}
+	}
+</script>
+
+<div class="flex items-center gap-2">
+	<input
+		bind:this={fileInput}
+		type="file"
+		accept="image/*"
+		class="hidden"
+		onchange={handleFile}
+		disabled={disabled || busy} />
+	<Button
+		type="button"
+		variant="outline"
+		size="sm"
+		class="h-7 gap-1.5"
+		disabled={disabled || busy}
+		onclick={() => fileInput?.click()}>
+		{#if busy}
+			<Loader class="size-3.5" />
+		{:else}
+			<QrCodeIcon size={14} />
+		{/if}
+		Scan QR
+	</Button>
+	{#if error}
+		<span class="text-xs text-red-500">{error}</span>
+	{/if}
+</div>

apps/desktop/src/lib/qr.ts

@@ -0,0 +1,75 @@
+import jsQR from 'jsqr'
+
+export const decodeQrFromFile = (file: File): Promise<string> =>
+	new Promise((resolve, reject) => {
+		const url = URL.createObjectURL(file)
+		const img = new Image()
+		img.onload = () => {
+			try {
+				const canvas = document.createElement('canvas')
+				canvas.width = img.naturalWidth
+				canvas.height = img.naturalHeight
+				const ctx = canvas.getContext('2d')
+				if (!ctx) throw new Error('Canvas is not supported')
+				ctx.drawImage(img, 0, 0)
+				const { data, width, height } = ctx.getImageData(
+					0,
+					0,
+					canvas.width,
+					canvas.height,
+				)
+				resolve(jsQR(data, width, height)?.data ?? '')
+			} catch (e) {
+				reject(e)
+			} finally {
+				URL.revokeObjectURL(url)
+			}
+		}
+		img.onerror = () => {
+			URL.revokeObjectURL(url)
+			reject(new Error('Could not load the image'))
+		}
+		img.src = url
+	})
+
+export type QrParseResult = {
+	address: string
+	amount?: string
+	destinationTag?: string
+}
+
+// Handles payment URIs (monero:ADDRESS?tx_amount=..., xrp:rADDR?amount=..&dt=..)
+// as well as bare addresses. Returns the last path-like segment before any
+// query string so prefixes and /pay paths are skipped.
+export const parseQrPayload = (
+	text: string,
+	kind: 'xrp' | 'monero',
+): QrParseResult => {
+	let body = text.trim().replace(/\s+/g, '')
+	body = body.replace(/^(?:[a-z0-9+.-]+):\/?\//i, '')
+	const [beforeQuery, queryRaw] = body.split('?')
+	const segments = beforeQuery.split('/')
+	const address = segments[segments.length - 1]
+
+	const params: Record<string, string> = {}
+	if (queryRaw) {
+		for (const pair of queryRaw.split('&')) {
+			const eq = pair.indexOf('=')
+			const key = (eq >= 0 ? pair.slice(0, eq) : pair).toLowerCase()
+			const value = eq >= 0 ? decodeURIComponent(pair.slice(eq + 1)) : ''
+			if (key) params[key] = value
+		}
+	}
+
+	if (kind === 'xrp') {
+		return {
+			address,
+			amount: params['amount'] || undefined,
+			destinationTag: params['dt'] || undefined,
+		}
+	}
+	return {
+		address,
+		amount: params['tx_amount'] || undefined,
+	}
+}

apps/desktop/src/routes/monero/send.svelte

@@ -19,6 +19,8 @@
 		SelectTrigger,
 	} from '$lib/components/ui/select/index.js'
 	import { navigate } from 'sv-router/generated'
+	import QrUpload from '$lib/components/qr-upload.svelte'
+	import { parseQrPayload } from '$lib/qr.js'
 
 	const w = moneroWallet
 
@@ -134,7 +136,15 @@
 				</div>
 
 				<div class="space-y-1.5">
-					<label class="text-xs font-medium">Recipient Address</label>
+					<div class="flex items-center justify-between">
+						<label class="text-xs font-medium">Recipient Address</label>
+						<QrUpload
+							onDecode={(text) => {
+								const parsed = parseQrPayload(text, 'monero')
+								recipient = parsed.address
+								if (parsed.amount && !sendAll) amountXmr = parsed.amount
+							}} />
+					</div>
 					<Input
 						placeholder="Monero address starting with 4..."
 						bind:value={recipient} />

apps/desktop/src/routes/xrp/send.svelte

@@ -10,6 +10,8 @@
 		CardDescription,
 	} from '$lib/components/ui/card/index.js'
 	import { navigate } from 'sv-router/generated'
+	import QrUpload from '$lib/components/qr-upload.svelte'
+	import { parseQrPayload } from '$lib/qr.js'
 
 	const w = xrpWallet
 
@@ -78,7 +80,16 @@
 				}}
 				class="space-y-4">
 				<div class="space-y-1.5">
-					<label class="text-xs font-medium">Recipient Address</label>
+					<div class="flex items-center justify-between">
+						<label class="text-xs font-medium">Recipient Address</label>
+						<QrUpload
+							onDecode={(text) => {
+								const parsed = parseQrPayload(text, 'xrp')
+								recipient = parsed.address
+								if (parsed.destinationTag) destinationTag = parsed.destinationTag
+								if (parsed.amount) amountXrp = parsed.amount
+							}} />
+					</div>
 					<Input
 						placeholder="XRP address starting with r..."
 						bind:value={recipient} />