feat: onchain payments (#53)

* feat: onchain payments

models.py

@@ -45,6 +45,8 @@ class EventExtra(BaseModel):
     nostr_notifications: bool = False
     notification_subject: str = ""
     notification_body: str = ""
+    onchain_enabled: bool = False
+    onchain_wallet_id: str | None = None
 
 
 class CreateEvent(BaseModel):
@@ -110,6 +112,7 @@ class TicketExtra(BaseModel):
     email_notification_sent: bool = False
     nostr_notification_sent: bool = False
     refunded: bool = False
+    onchain: bool = False
 
 
 class CreateTicket(BaseModel):
@@ -167,6 +170,9 @@ class TicketPaymentRequest(BaseModel):
     fiat_payment_request: str | None = None
     fiat_provider: str | None = None
     is_fiat: bool = False
+    onchain_address: str | None = None
+    onchain_mempool_endpoint: str | None = None
+    onchain_amount_sat: int | None = None
 
 
 class TicketFilters(FilterModel):

services.py

@@ -5,7 +5,9 @@ from asyncio.tasks import create_task
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
 from html import escape
+from typing import Any
 
+import httpx
 from lnbits.core.models.users import UserNotifications
 from lnbits.core.services.notifications import send_user_notification
 from lnbits.helpers import is_valid_email_address
@@ -29,6 +31,47 @@ from .models import (
 )
 
 
+async def fetch_watchonly_config(api_key: str) -> dict[str, Any]:
+    async with httpx.AsyncClient() as client:
+        resp = await client.get(
+            url=f"http://{settings.host}:{settings.port}/watchonly/api/v1/config",
+            headers={"X-API-KEY": api_key},
+        )
+        resp.raise_for_status()
+        return resp.json()
+
+
+async def fetch_watchonly_wallets(api_key: str, network: str) -> list[dict[str, Any]]:
+    async with httpx.AsyncClient() as client:
+        resp = await client.get(
+            url=f"http://{settings.host}:{settings.port}/watchonly/api/v1/wallet",
+            headers={"X-API-KEY": api_key},
+            params={"network": network},
+        )
+        resp.raise_for_status()
+        return resp.json()
+
+
+async def fetch_watchonly_wallet(api_key: str, wallet_id: str) -> dict[str, Any]:
+    async with httpx.AsyncClient() as client:
+        resp = await client.get(
+            url=f"http://{settings.host}:{settings.port}/watchonly/api/v1/wallet/{wallet_id}",
+            headers={"X-API-KEY": api_key},
+        )
+        resp.raise_for_status()
+        return resp.json()
+
+
+async def fetch_onchain_address(api_key: str, wallet_id: str) -> dict[str, Any]:
+    async with httpx.AsyncClient() as client:
+        resp = await client.get(
+            url=f"http://{settings.host}:{settings.port}/watchonly/api/v1/address/{wallet_id}",
+            headers={"X-API-KEY": api_key},
+        )
+        resp.raise_for_status()
+        return resp.json()
+
+
 async def set_ticket_paid(ticket: Ticket) -> Ticket:
     if ticket.paid:
         return ticket

static/js/display.js

@@ -27,7 +27,11 @@ window.PageEventsDisplay = {
         show: false,
         status: 'pending',
         paymentReq: null,
-        isFiat: false
+        isFiat: false,
+        isOnchain: false,
+        onchainAddress: null,
+        onchainAmountSat: 0,
+        mempoolEndpoint: null
       },
       paymentDismissMsg: null,
       paymentWebsocket: null
@@ -79,6 +83,32 @@ window.PageEventsDisplay = {
     },
     allowNostrNotifications() {
       return Boolean(this.event?.extra?.nostr_notifications)
+    },
+    allowOnchain() {
+      return Boolean(this.event?.extra?.onchain_enabled)
+    },
+    showPaymentMethodSelector() {
+      return this.allowFiatCheckout || this.allowOnchain
+    },
+    paymentMethodOptions() {
+      const options = [{label: 'Lightning', value: 'lightning'}]
+      if (this.allowFiatCheckout) {
+        options.push({label: this.fiatCheckoutLabel, value: 'fiat'})
+      }
+      if (this.allowOnchain) {
+        options.push({label: 'Bitcoin', value: 'onchain'})
+      }
+      return options
+    },
+    onchainPaymentUri() {
+      if (!this.receive.onchainAddress) return ''
+      const btc = (this.receive.onchainAmountSat / 100000000).toFixed(8)
+      return `bitcoin:${this.receive.onchainAddress}?amount=${btc}`
+    },
+    mempoolAddressUrl() {
+      if (!this.receive.onchainAddress || !this.receive.mempoolEndpoint)
+        return null
+      return `${this.receive.mempoolEndpoint}/address/${this.receive.onchainAddress}`
     }
   },
   methods: {
@@ -131,7 +161,11 @@ window.PageEventsDisplay = {
         show: false,
         status: 'pending',
         paymentReq: null,
-        isFiat: false
+        isFiat: false,
+        isOnchain: false,
+        onchainAddress: null,
+        onchainAmountSat: 0,
+        mempoolEndpoint: null
       }
     },
     nameValidation(val) {
@@ -169,7 +203,11 @@ window.PageEventsDisplay = {
         show: false,
         status: 'complete',
         paymentReq: null,
-        isFiat: false
+        isFiat: false,
+        isOnchain: false,
+        onchainAddress: null,
+        onchainAmountSat: 0,
+        mempoolEndpoint: null
       }
       this.ticketLink = {
         show: true,
@@ -192,14 +230,17 @@ window.PageEventsDisplay = {
             promo_code: this.formDialog.data.promo_code || null,
             refund_address: this.formDialog.data.refund || null,
             nostr_identifier: this.formDialog.data.nostr_identifier || null,
-            payment_method: this.allowFiatCheckout
+            payment_method: this.showPaymentMethodSelector
               ? this.formDialog.data.payment_method
               : 'lightning'
           }
         )
-        const isFiat = Boolean(data.is_fiat)
+        const isOnchain = Boolean(data.onchain_address)
+        const isFiat = !isOnchain && Boolean(data.is_fiat)
         this.paymentReq = isFiat
           ? data.fiat_payment_request || null
+          : isOnchain
+            ? null
             : data.payment_request
         this.paymentHash = data.payment_hash
 
@@ -211,7 +252,11 @@ window.PageEventsDisplay = {
           show: true,
           status: 'pending',
           paymentReq: this.paymentReq,
-          isFiat
+          isFiat,
+          isOnchain,
+          onchainAddress: data.onchain_address || null,
+          onchainAmountSat: data.onchain_amount_sat || 0,
+          mempoolEndpoint: data.onchain_mempool_endpoint || null
         }
         if (isFiat && this.paymentReq) {
           window.open(this.paymentReq, '_blank', 'noopener')

static/js/display.vue

@@ -80,20 +80,18 @@
               "
             ></q-select>
             <div class="row q-col-gutter-md q-pt-lg items-center">
-              <div v-if="allowFiatCheckout" class="col-auto">
+              <div v-if="showPaymentMethodSelector" class="col-auto">
                 <q-option-group
                   v-model="formDialog.data.payment_method"
                   inline
-                  :options="[
+                  :options="paymentMethodOptions"
-                    {label: 'Lightning', value: 'lightning'},
-                    {
-                      label: fiatCheckoutLabel,
-                      value: 'fiat'
-                    }
-                  ]"
                 ></q-option-group>
               </div>
-              <div :class="allowFiatCheckout ? 'col-12 col-md-3' : 'col-12'">
+              <div
+                :class="
+                  showPaymentMethodSelector ? 'col-12 col-md-3' : 'col-12'
+                "
+              >
                 <q-input
                   filled
                   dense
@@ -140,7 +138,7 @@
 
     <q-dialog v-model="receive.show" position="top" @hide="closeReceiveDialog">
       <q-card
-        v-if="!receive.paymentReq"
+        v-if="!receive.paymentReq && !receive.isOnchain"
         class="q-pa-lg q-pt-xl lnbits__dialog-card"
       >
       </q-card>
@@ -175,6 +173,51 @@
           <q-btn v-close-popup flat color="grey" class="q-ml-auto">Close</q-btn>
         </div>
       </q-card>
+      <q-card
+        v-else-if="receive.isOnchain"
+        class="q-pa-lg q-pt-xl lnbits__dialog-card"
+      >
+        <div class="text-center q-mb-lg">
+          <div class="text-h6 q-mb-sm">Pay with Bitcoin</div>
+          <lnbits-qrcode
+            :href="onchainPaymentUri"
+            :value="onchainPaymentUri.toUpperCase()"
+          ></lnbits-qrcode>
+          <div class="text-body1 q-mt-md">
+            <strong
+              >{{
+                (receive.onchainAmountSat / 100000000).toFixed(8)
+              }}
+              BTC</strong
+            >
+          </div>
+          <div
+            class="text-caption text-grey q-mt-xs"
+            style="word-break: break-all"
+          >
+            {{ receive.onchainAddress }}
+          </div>
+        </div>
+        <div class="row q-mt-lg q-col-gutter-sm">
+          <q-btn
+            outline
+            color="grey"
+            @click="utils.copyText(receive.onchainAddress)"
+            >Copy address</q-btn
+          >
+          <q-btn
+            v-if="mempoolAddressUrl"
+            outline
+            color="grey"
+            type="a"
+            :href="mempoolAddressUrl"
+            target="_blank"
+            rel="noopener"
+            >View on mempool</q-btn
+          >
+          <q-btn v-close-popup flat color="grey" class="q-ml-auto">Close</q-btn>
+        </div>
+      </q-card>
       <q-card v-else class="q-pa-lg q-pt-xl lnbits__dialog-card">
         <div class="text-center q-mb-lg">
           <lnbits-qrcode

static/js/index.js

@@ -128,7 +128,8 @@ window.PageEvents = {
             promo_codes: []
           }
         }
-      }
+      },
+      onchainWallets: []
     }
   },
   methods: {
@@ -136,6 +137,42 @@ window.PageEvents = {
       if (!value) return ''
       return value.length > 4 ? `${value.slice(0, 4)}...` : value
     },
+    async loadOnchainWallets() {
+      const wallet = _.findWhere(this.g.user.wallets, {
+        id: this.formDialog.data.wallet
+      })
+      if (!wallet) return
+      try {
+        const {data} = await LNbits.api.request(
+          'GET',
+          '/events/api/v1/events/onchain/status',
+          wallet.adminkey
+        )
+        this.onchainWallets = data.available ? data.wallets || [] : []
+      } catch {
+        this.onchainWallets = []
+      }
+    },
+    async confirmOnchainTicket(ticket) {
+      const wallet = _.findWhere(this.g.user.wallets, {id: ticket.wallet})
+      if (!wallet) return
+      try {
+        await LNbits.api.request(
+          'PUT',
+          `/events/api/v1/tickets/${ticket.id}/onchain-confirm`,
+          wallet.adminkey
+        )
+        Quasar.Notify.create({
+          type: 'positive',
+          message: 'Onchain payment confirmed.',
+          icon: null
+        })
+        await this.getTickets()
+        await this.getAllTickets()
+      } catch (error) {
+        LNbits.utils.notifyApiError(error)
+      }
+    },
     primaryTicketWave(data = this.formDialog.data) {
       if (!data.extra) data.extra = {}
       if (!data.extra.ticket_waves || data.extra.ticket_waves.length === 0) {
@@ -403,6 +440,8 @@ window.PageEvents = {
             min_tickets: 1,
             email_notifications: false,
             nostr_notifications: false,
+            onchain_enabled: false,
+            onchain_wallet_id: null,
             ticket_waves: [
               {
                 id: 'primary',
@@ -425,6 +464,12 @@ window.PageEvents = {
         }
       }
       this.formDialog.show = true
+      if (
+        this.formDialog.data.wallet &&
+        this.formDialog.data.extra?.onchain_enabled
+      ) {
+        this.loadOnchainWallets()
+      }
     },
     resetEventDialog() {
       this.formDialog.show = false
@@ -437,6 +482,8 @@ window.PageEvents = {
           min_tickets: 1,
           email_notifications: false,
           nostr_notifications: false,
+          onchain_enabled: false,
+          onchain_wallet_id: null,
           ticket_waves: [
             {
               id: 'primary',

static/js/index.vue

@@ -265,6 +265,18 @@
                   >
                     <q-tooltip>Resend ticket email</q-tooltip>
                   </q-btn>
+                  <q-btn
+                    v-if="props.row.extra?.onchain && !props.row.paid"
+                    flat
+                    dense
+                    size="xs"
+                    @click="confirmOnchainTicket(props.row)"
+                    icon="currency_bitcoin"
+                    color="orange"
+                    class="q-ml-xs"
+                  >
+                    <q-tooltip>Confirm onchain payment</q-tooltip>
+                  </q-btn>
                 </q-td>
 
                 <q-td v-for="col in props.cols" :key="col.name" :props="props">
@@ -602,6 +614,42 @@
             </div>
           </q-expansion-item>
 
+          <q-expansion-item
+            group="advanced"
+            icon="currency_bitcoin"
+            label="Onchain payments"
+          >
+            <div class="q-mt-lg">
+              <div class="text-caption q-mb-md">
+                Accept Bitcoin onchain payments. Requires the Watchonly
+                extension.
+              </div>
+              <q-toggle
+                v-model="formDialog.data.extra.onchain_enabled"
+                label="Accept onchain payments"
+                left-label
+                @update:model-value="val => val && loadOnchainWallets()"
+              ></q-toggle>
+              <q-select
+                v-if="formDialog.data.extra.onchain_enabled"
+                filled
+                dense
+                class="q-mt-md"
+                v-model="formDialog.data.extra.onchain_wallet_id"
+                label="Watchonly wallet"
+                :options="
+                  onchainWallets.map(w => ({
+                    label: w.title || w.id,
+                    value: w.id
+                  }))
+                "
+                emit-value
+                map-options
+                hint="Bitcoin watchonly wallet for receiving onchain payments"
+              ></q-select>
+            </div>
+          </q-expansion-item>
+
           <div class="row q-mt-lg">
             <q-btn
               v-if="formDialog.data.id"

views_api.py

@@ -16,7 +16,7 @@ from fastapi import (
     WebSocketDisconnect,
 )
 from fastapi.responses import StreamingResponse
-from lnbits.core.crud import get_user
+from lnbits.core.crud import get_standalone_payment, get_user
 from lnbits.core.crud.assets import get_public_asset
 from lnbits.core.crud.wallets import get_wallet
 from lnbits.core.models import WalletTypeInfo
@@ -30,6 +30,7 @@ from lnbits.decorators import (
 )
 from lnbits.helpers import generate_filter_params_openapi
 from lnbits.settings import settings
+from lnbits.tasks import internal_invoice_queue_put
 from lnbits.utils.exchange_rates import (
     fiat_amount_as_satoshis,
     get_fiat_rate_satoshis,
@@ -65,7 +66,14 @@ from .models import (
     ensure_ticket_waves,
     get_active_ticket_waves,
 )
-from .services import refund_tickets, resend_ticket_email_notification
+from .services import (
+    fetch_onchain_address,
+    fetch_watchonly_config,
+    fetch_watchonly_wallet,
+    fetch_watchonly_wallets,
+    refund_tickets,
+    resend_ticket_email_notification,
+)
 from .tasks import deregister_payment_listener, register_payment_listener
 
 events_api_router = APIRouter(prefix="/api/v1/events")
@@ -74,6 +82,76 @@ qr_api_router = APIRouter(prefix="/api/v1")
 tickets_filters = parse_filters(TicketFilters)
 
 
+async def _get_watchonly_status(wallet) -> dict[str, Any]:
+    try:
+        config = await fetch_watchonly_config(wallet.inkey)
+        network = config.get("network")
+        if not network:
+            raise HTTPException(
+                status_code=HTTPStatus.BAD_REQUEST,
+                detail="Watchonly extension returned an invalid network.",
+            )
+        wallets = await fetch_watchonly_wallets(wallet.inkey, network)
+    except HTTPException:
+        raise
+    except Exception as exc:
+        return {
+            "available": False,
+            "message": f"Watchonly extension is not reachable: {exc!s}",
+            "network": None,
+            "wallets": [],
+            "mempool_endpoint": None,
+        }
+    return {
+        "available": True,
+        "message": None,
+        "network": network,
+        "wallets": wallets,
+        "mempool_endpoint": config.get("mempool_endpoint"),
+    }
+
+
+async def _validate_watchonly_settings(
+    *,
+    wallet,
+    onchain_enabled: bool,
+    onchain_wallet_id: str | None,
+) -> dict[str, Any]:
+    if not onchain_enabled:
+        raise HTTPException(
+            status_code=HTTPStatus.BAD_REQUEST,
+            detail="Onchain payments are not enabled for this event.",
+        )
+    if not onchain_wallet_id:
+        raise HTTPException(
+            status_code=HTTPStatus.BAD_REQUEST,
+            detail="No watchonly wallet configured for onchain payments.",
+        )
+    status = await _get_watchonly_status(wallet)
+    if not status["available"]:
+        raise HTTPException(
+            status_code=HTTPStatus.BAD_REQUEST,
+            detail=status["message"] or "Watchonly extension is not available.",
+        )
+    try:
+        watch_wallet = await fetch_watchonly_wallet(wallet.inkey, onchain_wallet_id)
+    except Exception as exc:
+        raise HTTPException(
+            status_code=HTTPStatus.BAD_REQUEST,
+            detail=f"Cannot access watchonly wallet: {exc!s}",
+        ) from exc
+    if watch_wallet.get("network") != status["network"]:
+        raise HTTPException(
+            status_code=HTTPStatus.BAD_REQUEST,
+            detail="Watchonly wallet network does not match user watchonly config.",
+        )
+    return {
+        "watch_wallet": watch_wallet,
+        "network": status["network"],
+        "mempool_endpoint": status["mempool_endpoint"],
+    }
+
+
 def _is_fiat_currency(currency: str | None) -> bool:
     return str(currency or "").lower() not in {"sat", "sats"}
 
@@ -120,6 +198,13 @@ async def api_events(
     return await get_events(wallet_ids)
 
 
+@events_api_router.get("/onchain/status")
+async def api_onchain_status(
+    wallet: WalletTypeInfo = Depends(require_admin_key),
+) -> dict[str, Any]:
+    return await _get_watchonly_status(wallet.wallet)
+
+
 @events_api_router.get("/{event_id}", response_model=PublicEvent)
 async def api_get_event(event_id: str) -> Event:
     event = await get_event(event_id)
@@ -371,7 +456,7 @@ async def api_ticket_create(
     refund_address = data.refund_address
     nostr_identifier = data.nostr_identifier.strip() if data.nostr_identifier else None
     payment_method = (data.payment_method or "lightning").lower()
-    if payment_method not in {"lightning", "fiat"}:
+    if payment_method not in {"lightning", "fiat", "onchain"}:
         raise HTTPException(
             status_code=HTTPStatus.BAD_REQUEST,
             detail="Unsupported payment method.",
@@ -438,6 +523,10 @@ async def api_ticket_create(
     invoice_unit = selected_wave.currency
     fiat_amount = price
     fiat_provider = None
+    onchain_address = None
+    onchain_mempool_endpoint = None
+    onchain_amount_sat = None
+
     if payment_method == "fiat":
         if _is_fiat_currency(selected_wave.currency):
             invoice_unit = selected_wave.currency
@@ -461,9 +550,42 @@ async def api_ticket_create(
                 status_code=HTTPStatus.BAD_REQUEST,
                 detail="No fiat payment provider configured for this event.",
             )
+    elif payment_method == "onchain":
+        invoice_unit = "sat"
+        onchain_amount_sat = int(price)
+        wallet_record = await get_wallet(event.wallet)
+        if not wallet_record:
+            raise HTTPException(
+                status_code=HTTPStatus.NOT_FOUND,
+                detail="Event wallet does not exist.",
+            )
+        validation = await _validate_watchonly_settings(
+            wallet=wallet_record,
+            onchain_enabled=event.extra.onchain_enabled,
+            onchain_wallet_id=event.extra.onchain_wallet_id,
+        )
+        address_data = await fetch_onchain_address(
+            wallet_record.inkey, event.extra.onchain_wallet_id or ""
+        )
+        onchain_address = address_data.get("address")
+        onchain_mempool_endpoint = validation.get("mempool_endpoint")
     else:
         invoice_unit = "sat"
 
+    if payment_method == "onchain":
+        payment = await create_payment_request(
+            wallet_id=event.wallet,
+            invoice_data=CreateInvoice(
+                out=False,
+                amount=float(onchain_amount_sat or 0),
+                unit="sat",
+                internal=True,
+                labels=["onchain"],
+                memo=f"{event_id}",
+                extra=extra,
+            ),
+        )
+    else:
         payment = await create_payment_request(
             wallet_id=event.wallet,
             invoice_data=CreateInvoice(
@@ -488,7 +610,10 @@ async def api_ticket_create(
             "refund_address": refund_address,
             "nostr_identifier": nostr_identifier,
             "ticket_base_url": str(request.base_url).rstrip("/"),
-            "sats_paid": payment.sat,
+            "sats_paid": (
+                onchain_amount_sat if payment_method == "onchain" else payment.sat
+            ),
+            "onchain": payment_method == "onchain",
         },
     )
 
@@ -498,6 +623,9 @@ async def api_ticket_create(
         fiat_payment_request=getattr(payment, "extra", {}).get("fiat_payment_request"),
         fiat_provider=getattr(payment, "fiat_provider", None) or fiat_provider,
         is_fiat=bool(getattr(payment, "fiat_provider", None) or fiat_provider),
+        onchain_address=onchain_address,
+        onchain_mempool_endpoint=onchain_mempool_endpoint,
+        onchain_amount_sat=onchain_amount_sat,
     )
 
 
@@ -559,6 +687,36 @@ async def api_ticket_delete(
     await delete_ticket(ticket_id)
 
 
+@tickets_api_router.put("/{payment_hash}/onchain-confirm")
+async def api_ticket_onchain_confirm(
+    payment_hash: str,
+    wallet: WalletTypeInfo = Depends(require_admin_key),
+) -> Ticket:
+    ticket = await get_ticket(payment_hash)
+    if not ticket:
+        raise HTTPException(
+            status_code=HTTPStatus.NOT_FOUND, detail="Ticket does not exist."
+        )
+    if ticket.wallet != wallet.wallet.id:
+        raise HTTPException(status_code=HTTPStatus.FORBIDDEN, detail="Not your ticket.")
+    if ticket.paid:
+        raise HTTPException(
+            status_code=HTTPStatus.BAD_REQUEST, detail="Ticket already paid."
+        )
+    if not ticket.extra.onchain:
+        raise HTTPException(
+            status_code=HTTPStatus.BAD_REQUEST,
+            detail="Ticket is not an onchain payment.",
+        )
+    payment = await get_standalone_payment(payment_hash)
+    if not payment:
+        raise HTTPException(
+            status_code=HTTPStatus.NOT_FOUND, detail="Payment does not exist."
+        )
+    await internal_invoice_queue_put(payment_hash)
+    return ticket
+
+
 @tickets_api_router.post("/{ticket_id}/resend-email", response_model=TicketResendResult)
 async def api_ticket_resend_email(
     ticket_id: str,