Wallet receive flow (#15) (#52)

* Pin sharp via pnpm override, add wallet receive

* Revert toast success styling

* Route receive through wallet connect

* Simplify receive invoice validation

* Polish receive modal layout

* Clarify NWC client config

* Adjust wallet action layout on mobile

package.json

@@ -92,6 +92,9 @@
     ],
     "onlyBuiltDependencies": [
       "sharp"
-    ]
+    ],
+    "overrides": {
+      "sharp": "0.35.0-rc.0"
+    }
   }
 }

src/app/components/WalletPay.svelte

@@ -14,6 +14,7 @@
   import ModalTitle from "@lib/components/ModalTitle.svelte"
   import ModalSubtitle from "@lib/components/ModalSubtitle.svelte"
   import ModalFooter from "@lib/components/ModalFooter.svelte"
+  import {errorMessage} from "@lib/util"
   import {payInvoice} from "@app/core/commands"
   import {pushToast} from "@app/util/toast"
   import {clearModals} from "@app/util/modal"
@@ -29,14 +30,18 @@
     loading = true
 
     try {
+      if (hasAmount) {
+        await payInvoice(invoice!.paymentRequest)
+      } else {
         await payInvoice(invoice!.paymentRequest, sats * 1000)
+      }
 
       pushToast({message: `Payment sent!`})
       clearModals()
     } catch (e) {
       console.error(e)
 
-      const message = String(e).replace(/^.*Error: /, "")
+      const message = errorMessage(e)
 
       pushToast({
         theme: "error",
@@ -50,6 +55,7 @@
   let loading = $state(false)
   let invoice: Invoice | undefined = $state()
   let sats = $state(0)
+  const hasAmount = $derived((invoice?.satoshi ?? 0) > 0)
 </script>
 
 <Modal>
@@ -60,7 +66,7 @@
     </ModalHeader>
     {#if invoice}
       <div class="card2 bg-alt flex flex-col gap-2">
-        {#if $session?.wallet?.type === "webln" && invoice.satoshi === 0}
+        {#if $session?.wallet?.type === "webln" && !hasAmount}
           <p class="text-sm opacity-75">
             Uh oh! It looks like your current wallet doesn't support invoices without an amount. See
             if you can get a lightning invoice with a pre-set amount.
@@ -101,7 +107,13 @@
       <Icon icon={AltArrowLeft} />
       Go back
     </Button>
-    <Button class="btn btn-primary" onclick={confirm} disabled={!invoice || sats === 0 || loading}>
+    <Button
+      class="btn btn-primary"
+      onclick={confirm}
+      disabled={!invoice ||
+        sats === 0 ||
+        loading ||
+        ($session?.wallet?.type === "webln" && !hasAmount)}>
       {#if loading}
         <span class="loading loading-spinner loading-sm"></span>
       {:else}

src/app/components/WalletReceive.svelte

@@ -0,0 +1,118 @@
+<script lang="ts">
+  import {Invoice} from "@getalby/lightning-tools/bolt11"
+  import AltArrowLeft from "@assets/icons/alt-arrow-left.svg?dataurl"
+  import Bolt from "@assets/icons/bolt.svg?dataurl"
+  import Button from "@lib/components/Button.svelte"
+  import FieldInline from "@lib/components/FieldInline.svelte"
+  import Icon from "@lib/components/Icon.svelte"
+  import Modal from "@lib/components/Modal.svelte"
+  import ModalBody from "@lib/components/ModalBody.svelte"
+  import ModalHeader from "@lib/components/ModalHeader.svelte"
+  import ModalTitle from "@lib/components/ModalTitle.svelte"
+  import ModalSubtitle from "@lib/components/ModalSubtitle.svelte"
+  import ModalFooter from "@lib/components/ModalFooter.svelte"
+  import {errorMessage} from "@lib/util"
+  import QRCode from "@app/components/QRCode.svelte"
+  import {createInvoice} from "@app/core/commands"
+  import {pushToast} from "@app/util/toast"
+
+  const back = () => history.back()
+
+  const create = async () => {
+    const satAmount = Math.floor(Number(sats))
+
+    if (!Number.isFinite(satAmount) || satAmount <= 0) {
+      pushToast({theme: "error", message: "Enter an amount greater than 0."})
+      return
+    }
+
+    loading = true
+
+    try {
+      const paymentRequest = await createInvoice({sats: satAmount})
+
+      invoice = new Invoice({pr: paymentRequest})
+      sats = invoice.satoshi && invoice.satoshi > 0 ? invoice.satoshi : satAmount
+
+      pushToast({message: "Invoice created"})
+    } catch (e) {
+      console.warn(e)
+
+      const message = errorMessage(e)
+
+      pushToast({
+        theme: "error",
+        message: `Failed to create invoice: ${message}`,
+      })
+    } finally {
+      loading = false
+    }
+  }
+
+  const reset = () => {
+    invoice = undefined
+    sats = 10
+  }
+
+  let loading = $state(false)
+  let invoice: Invoice | undefined = $state()
+  let sats = $state(10)
+
+  const invoiceHasAmount = $derived((invoice?.satoshi ?? 0) > 0)
+</script>
+
+<Modal>
+  <ModalBody>
+    <ModalHeader>
+      <ModalTitle>Receive with Lightning</ModalTitle>
+      <ModalSubtitle>Use your wallet to receive Bitcoin payments over lightning.</ModalSubtitle>
+    </ModalHeader>
+    {#if invoice}
+      <div class="card2 bg-alt flex flex-col gap-2">
+        <div class="flex flex-col items-center gap-6 pt-4">
+          <QRCode code={invoice.paymentRequest} class="w-full max-w-64" />
+          <p class="text-center text-sm opacity-75">Scan with your wallet, or click to copy.</p>
+        </div>
+        <p class="text-sm opacity-75">
+          Share this invoice to receive <strong>{sats}</strong> satoshis
+          {invoiceHasAmount ? "" : " (payer chooses the exact amount)"}.
+        </p>
+      </div>
+    {:else}
+      <div class="card2 bg-alt flex flex-col gap-2">
+        <FieldInline>
+          {#snippet label()}
+            Amount (satoshis)
+          {/snippet}
+          {#snippet input()}
+            <div class="flex flex-grow justify-end">
+              <label class="input input-bordered flex items-center gap-2">
+                <Icon icon={Bolt} />
+                <input bind:value={sats} type="number" class="w-14" placeholder="0" />
+              </label>
+            </div>
+          {/snippet}
+        </FieldInline>
+        <p class="text-sm opacity-75">Enter an amount to generate an invoice with your wallet.</p>
+      </div>
+    {/if}
+  </ModalBody>
+  <ModalFooter>
+    <Button class="btn btn-link" onclick={back}>
+      <Icon icon={AltArrowLeft} />
+      Go back
+    </Button>
+    {#if invoice}
+      <Button class="btn btn-neutral" onclick={reset} disabled={loading}>Clear Invoice</Button>
+    {:else}
+      <Button class="btn btn-primary" onclick={create} disabled={loading}>
+        {#if loading}
+          <span class="loading loading-spinner loading-sm"></span>
+        {:else}
+          <Icon icon={Bolt} />
+        {/if}
+        Create Invoice
+      </Button>
+    {/if}
+  </ModalFooter>
+</Modal>

src/app/components/Zap.svelte

@@ -17,6 +17,7 @@
   import ModalSubtitle from "@lib/components/ModalSubtitle.svelte"
   import ModalFooter from "@lib/components/ModalFooter.svelte"
   import EmojiButton from "@lib/components/EmojiButton.svelte"
+  import {errorMessage} from "@lib/util"
   import ProfileLink from "@app/components/ProfileLink.svelte"
   import {payInvoice} from "@app/core/commands"
   import {pushToast} from "@app/util/toast"
@@ -85,7 +86,7 @@
     } catch (e) {
       console.error(e)
 
-      const message = String(e).replace(/^.*Error: /, "")
+      const message = errorMessage(e)
 
       pushToast({
         theme: "error",

src/app/core/commands.ts

@@ -425,6 +425,22 @@ export const publishLeaveRequest = (params: LeaveRequestParams) =>
 
 export const getWebLn = () => (window as any).webln
 
+export const getNwcClient = () => {
+  const $session = session.get()
+
+  if (!$session?.wallet || $session.wallet.type !== "nwc") {
+    throw new Error("No NWC wallet is connected")
+  }
+
+  const {info} = $session.wallet
+
+  if (info.nostrWalletConnectUrl) {
+    return new nwc.NWCClient({nostrWalletConnectUrl: info.nostrWalletConnectUrl})
+  }
+
+  return new nwc.NWCClient(info)
+}
+
 export const payInvoice = async (invoice: string, msats?: number) => {
   const $session = session.get()
 
@@ -435,7 +451,7 @@ export const payInvoice = async (invoice: string, msats?: number) => {
   if ($session.wallet.type === "nwc") {
     const params: {invoice: string; amount?: number} = {invoice}
     if (msats) params.amount = msats
-    return new nwc.NWCClient($session.wallet.info).payInvoice(params)
+    return getNwcClient().payInvoice(params)
   } else if ($session.wallet.type === "webln") {
     if (msats) throw new Error("Unable to pay zero invoices with webln")
     return getWebLn()
@@ -444,6 +460,67 @@ export const payInvoice = async (invoice: string, msats?: number) => {
   }
 }
 
+export type CreateInvoiceParams = {
+  sats: number
+  description?: string
+}
+
+export const createInvoice = async ({
+  sats,
+  description = "Receive via lightning",
+}: CreateInvoiceParams) => {
+  const $session = session.get()
+
+  if (!$session?.wallet) {
+    throw new Error("No wallet is connected")
+  }
+
+  const satAmount = Math.floor(sats)
+
+  if (!Number.isFinite(satAmount) || satAmount <= 0) {
+    throw new Error("Invalid satoshi amount")
+  }
+
+  if ($session.wallet.type === "nwc") {
+    const createdInvoice = await getNwcClient().makeInvoice({
+      amount: satAmount * 1000,
+      description,
+    })
+
+    if (!createdInvoice.invoice) {
+      throw new Error("NWC wallet failed to return an invoice")
+    }
+
+    return createdInvoice.invoice
+  }
+
+  if ($session.wallet.type === "webln") {
+    const webLn = getWebLn()
+
+    if (!webLn) {
+      throw new Error("WebLN not available")
+    }
+
+    await webLn.enable()
+
+    const response = await webLn.makeInvoice({
+      amount: satAmount,
+      defaultMemo: description,
+    })
+
+    const paymentRequest =
+      typeof response === "string" ? response : response?.paymentRequest || response?.pr || ""
+
+    if (!paymentRequest) {
+      throw new Error("Invalid payment request returned from WebLN")
+    }
+
+    return paymentRequest
+  }
+
+  throw new Error("Unsupported wallet type")
+}
+
 // File upload
 
 export const normalizeBlossomUrl = (url: string) => normalizeUrl(url.replace(/^ws/, "http"))

src/lib/util.ts

@@ -17,6 +17,8 @@ export const daysBetween = (start: number, end: number) => [...range(start, end,
 
 export const ucFirst = (s: string) => s.slice(0, 1).toUpperCase() + s.slice(1)
 
+export const errorMessage = (err: unknown) => String(err).replace(/^.*Error: /, "")
+
 export const buildUrl = (base: string | URL, ...pathname: string[]) => {
   const url = new URL(base)
 

src/routes/settings/wallet/+page.svelte

@@ -3,10 +3,12 @@
   import {LOCALE} from "@welshman/lib"
   import {displayRelayUrl, isNWCWallet, fromMsats} from "@welshman/util"
   import {session, pubkey, profilesByPubkey} from "@welshman/app"
-  import Bolt from "@assets/icons/bolt.svg?dataurl"
+  import DownloadMinimalistic from "@assets/icons/download-minimalistic.svg?dataurl"
+  import UploadMinimalistic from "@assets/icons/upload-minimalistic.svg?dataurl"
   import Icon from "@lib/components/Icon.svelte"
   import Button from "@lib/components/Button.svelte"
   import WalletPay from "@app/components/WalletPay.svelte"
+  import WalletReceive from "@app/components/WalletReceive.svelte"
   import WalletConnect from "@app/components/WalletConnect.svelte"
   import WalletDisconnect from "@app/components/WalletDisconnect.svelte"
   import WalletUpdateReceivingAddress from "@app/components/WalletUpdateReceivingAddress.svelte"
@@ -31,6 +33,13 @@
   )
 
   const pay = () => pushModal(WalletPay)
+  const receive = () => {
+    if ($session?.wallet) {
+      pushModal(WalletReceive)
+    } else {
+      pushModal(WalletConnect)
+    }
+  }
 </script>
 
 <div class="content column gap-4">
@@ -94,10 +103,24 @@
             </p>
           </div>
         {/if}
+        <div class="flex flex-col gap-4 lg:flex-row lg:justify-between">
           <Button class="btn btn-neutral btn-sm" onclick={disconnect}>
             <Icon icon={CloseCircle} />
             Disconnect Wallet
           </Button>
+          <div class="flex w-full gap-4 lg:w-auto">
+            <Button class="btn btn-primary btn-sm flex-1 justify-center lg:flex-none" onclick={pay}>
+              <Icon icon={UploadMinimalistic} />
+              Send
+            </Button>
+            <Button
+              class="btn btn-secondary btn-sm flex-1 justify-center lg:flex-none"
+              onclick={receive}>
+              <Icon icon={DownloadMinimalistic} />
+              Receive
+            </Button>
+          </div>
+        </div>
       {:else}
         <p class="py-12 text-center opacity-75">No wallet connected</p>
       {/if}
@@ -122,10 +145,4 @@
       </div>
     {/if}
   </div>
-  <div class="flex justify-center py-12">
-    <Button class="btn btn-primary" onclick={pay}>
-      <Icon icon={Bolt} />
-      Pay With Lightning
-    </Button>
-  </div>
 </div>