feat(paywall): improved extension

- make remember cookie optional
- improve database
- improve type casting

lnbits/extensions/paywall/config.json

@@ -1,6 +1,6 @@
 {
     "name": "Paywall",
     "short_description": "Create paywalls for content",
-    "icon": "vpn_lock",
+    "icon": "policy",
     "contributors": ["eillarra"]
 }

lnbits/extensions/paywall/crud.py

@@ -6,15 +6,17 @@ from lnbits.helpers import urlsafe_short_hash
 from .models import Paywall
 
 
-def create_paywall(*, wallet_id: str, url: str, memo: str, amount: int) -> Paywall:
+def create_paywall(
+    *, wallet_id: str, url: str, memo: str, description: Optional[str] = None, amount: int = 0, remembers: bool = True
+) -> Paywall:
     with open_ext_db("paywall") as db:
         paywall_id = urlsafe_short_hash()
         db.execute(
             """
-            INSERT INTO paywalls (id, wallet, secret, url, memo, amount)
-            VALUES (?, ?, ?, ?, ?, ?)
+            INSERT INTO paywalls (id, wallet, url, memo, description, amount, remembers)
+            VALUES (?, ?, ?, ?, ?, ?, ?)
             """,
-            (paywall_id, wallet_id, urlsafe_short_hash(), url, memo, amount),
+            (paywall_id, wallet_id, url, memo, description, amount, int(remembers)),
         )
 
     return get_paywall(paywall_id)
@@ -24,7 +26,7 @@ def get_paywall(paywall_id: str) -> Optional[Paywall]:
     with open_ext_db("paywall") as db:
         row = db.fetchone("SELECT * FROM paywalls WHERE id = ?", (paywall_id,))
 
-    return Paywall(**row) if row else None
+    return Paywall.from_row(row) if row else None
 
 
 def get_paywalls(wallet_ids: Union[str, List[str]]) -> List[Paywall]:
@@ -35,7 +37,7 @@ def get_paywalls(wallet_ids: Union[str, List[str]]) -> List[Paywall]:
         q = ",".join(["?"] * len(wallet_ids))
         rows = db.fetchall(f"SELECT * FROM paywalls WHERE wallet IN ({q})", (*wallet_ids,))
 
-    return [Paywall(**row) for row in rows]
+    return [Paywall.from_row(row) for row in rows]
 
 
 def delete_paywall(paywall_id: str) -> None:

lnbits/extensions/paywall/migrations.py

@@ -1,3 +1,5 @@
+from sqlite3 import OperationalError
+
 from lnbits.db import open_ext_db
 
 
@@ -20,6 +22,52 @@ def m001_initial(db):
     )
 
 
+def m002_redux(db):
+    """
+    Creates an improved paywalls table and migrates the existing data.
+    """
+    try:
+        db.execute("SELECT remembers FROM paywalls")
+
+    except OperationalError:
+        db.execute("ALTER TABLE paywalls RENAME TO paywalls_old")
+        db.execute(
+            """
+            CREATE TABLE IF NOT EXISTS paywalls (
+                id TEXT PRIMARY KEY,
+                wallet TEXT NOT NULL,
+                url TEXT NOT NULL,
+                memo TEXT NOT NULL,
+                description TEXT NULL,
+                amount INTEGER DEFAULT 0,
+                time TIMESTAMP NOT NULL DEFAULT (strftime('%s', 'now')),
+                remembers INTEGER DEFAULT 0,
+                extras TEXT NULL
+            );
+        """
+        )
+        db.execute("CREATE INDEX IF NOT EXISTS wallet_idx ON paywalls (wallet)")
+
+        for row in [list(row) for row in db.fetchall("SELECT * FROM paywalls_old")]:
+            db.execute(
+                """
+                INSERT INTO paywalls (
+                    id,
+                    wallet,
+                    url,
+                    memo,
+                    amount,
+                    time
+                )
+                VALUES (?, ?, ?, ?, ?, ?)
+                """,
+                (row[0], row[1], row[3], row[4], row[5], row[6]),
+            )
+
+        db.execute("DROP TABLE paywalls_old")
+
+
 def migrate():
     with open_ext_db("paywall") as db:
         m001_initial(db)
+        m002_redux(db)

lnbits/extensions/paywall/models.py

@@ -1,11 +1,23 @@
-from typing import NamedTuple
+import json
+
+from sqlite3 import Row
+from typing import NamedTuple, Optional
 
 
 class Paywall(NamedTuple):
     id: str
     wallet: str
-    secret: str
     url: str
     memo: str
+    description: str
     amount: int
     time: int
+    remembers: bool
+    extras: Optional[dict]
+
+    @classmethod
+    def from_row(cls, row: Row) -> "Paywall":
+        data = dict(row)
+        data["remembers"] = bool(data["remembers"])
+        data["extras"] = json.loads(data["extras"]) if data["extras"] else None
+        return cls(**data)

lnbits/extensions/paywall/templates/paywall/_api_docs.html

@@ -6,12 +6,106 @@
 >
   <q-expansion-item group="api" dense expand-separator label="List paywalls">
     <q-card>
-      <q-card-section> </q-card-section>
+      <q-card-section>
+        <code
+          ><span class="text-blue">GET</span> /paywall/api/v1/paywalls</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">Headers</h5>
+        <code>{"X-Api-Key": &lt;invoice_key&gt;}</code><br />
+        <h5 class="text-caption q-mt-sm q-mb-none">Body (application/json)</h5>
+        <h5 class="text-caption q-mt-sm q-mb-none">
+          Returns 200 OK (application/json)
+        </h5>
+        <code>[&lt;paywall_object&gt;, ...]</code>
+        <h5 class="text-caption q-mt-sm q-mb-none">Curl example</h5>
+        <code
+          >curl -X GET {{ request.url_root }}paywall/api/v1/paywalls -H
+          "X-Api-Key: {{ g.user.wallets[0].inkey }}"
+        </code>
+      </q-card-section>
     </q-card>
   </q-expansion-item>
   <q-expansion-item group="api" dense expand-separator label="Create a paywall">
     <q-card>
-      <q-card-section> </q-card-section>
+      <q-card-section>
+        <code
+          ><span class="text-green">POST</span>
+          /paywall/api/v1/paywalls</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">Headers</h5>
+        <code>{"X-Api-Key": &lt;admin_key&gt;}</code><br />
+        <h5 class="text-caption q-mt-sm q-mb-none">Body (application/json)</h5>
+        <code
+          >{"amount": &lt;integer&gt;, "description": &lt;string&gt;,
+          "memo": &lt;string&gt;, "remembers": &lt;boolean&gt;,
+          "url": &lt;string&gt;}</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">
+          Returns 201 CREATED (application/json)
+        </h5>
+        <code>{"amount": &lt;integer&gt;, "description": &lt;string&gt;,
+          "id": &lt;string&gt;, "memo": &lt;string&gt;,
+          "remembers": &lt;boolean&gt;, "time": &lt;int&gt;,
+          "url": &lt;string&gt;, "wallet": &lt;string&gt;}</code>
+        <h5 class="text-caption q-mt-sm q-mb-none">Curl example</h5>
+        <code
+          >curl -X POST {{ request.url_root }}paywall/api/v1/paywalls -d
+          '{"url": &lt;string&gt;, "memo": &lt;string&gt;,
+          "description": &lt;string&gt;, "amount": &lt;integer&gt;,
+          "remembers": &lt;boolean&gt;}' -H
+          "Content-type: application/json" -H "X-Api-Key: {{
+          g.user.wallets[0].adminkey }}"
+        </code>
+      </q-card-section>
+    </q-card>
+  </q-expansion-item>
+  <q-expansion-item group="api" dense expand-separator label="Create an invoice (public)">
+    <q-card>
+      <q-card-section>
+        <code
+          ><span class="text-green">POST</span>
+          /paywall/api/v1/paywalls/&lt;paywall_id&gt;/invoice</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">Body (application/json)</h5>
+        <code
+          >{"amount": &lt;integer&gt;}</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">
+          Returns 201 CREATED (application/json)
+        </h5>
+        <code>{"checking_id": &lt;string&gt;, "payment_request": &lt;string&gt;}</code>
+        <h5 class="text-caption q-mt-sm q-mb-none">Curl example</h5>
+        <code
+          >curl -X POST {{ request.url_root }}paywall/api/v1/paywalls/&lt;paywall_id&gt;/invoice -d
+          '{"amount": &lt;integer&gt;}' -H
+          "Content-type: application/json"
+        </code>
+      </q-card-section>
+    </q-card>
+  </q-expansion-item>
+  <q-expansion-item group="api" dense expand-separator label="Check invoice status (public)">
+    <q-card>
+      <q-card-section>
+        <code
+          ><span class="text-green">POST</span>
+          /paywall/api/v1/paywalls/&lt;paywall_id&gt;/check_invoice</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">Body (application/json)</h5>
+        <code
+          >{"checking_id": &lt;string&gt;}</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">
+          Returns 200 OK (application/json)
+        </h5>
+        <code>{"paid": false}</code><br>
+        <code>{"paid": true, "url": &lt;string&gt;, "remembers": &lt;boolean&gt;}</code>
+        <h5 class="text-caption q-mt-sm q-mb-none">Curl example</h5>
+        <code
+          >curl -X POST {{ request.url_root }}paywall/api/v1/paywalls/&lt;paywall_id&gt;/check_invoice -d
+          '{"checking_id": &lt;string&gt;}' -H
+          "Content-type: application/json"
+        </code>
+      </q-card-section>
     </q-card>
   </q-expansion-item>
   <q-expansion-item
@@ -22,7 +116,22 @@
     class="q-pb-md"
   >
     <q-card>
-      <q-card-section> </q-card-section>
+      <q-card-section>
+        <code
+          ><span class="text-pink">DELETE</span>
+          /paywall/api/v1/paywalls/&lt;paywall_id&gt;</code
+        >
+        <h5 class="text-caption q-mt-sm q-mb-none">Headers</h5>
+        <code>{"X-Api-Key": &lt;admin_key&gt;}</code><br />
+        <h5 class="text-caption q-mt-sm q-mb-none">Returns 204 NO CONTENT</h5>
+        <code></code>
+        <h5 class="text-caption q-mt-sm q-mb-none">Curl example</h5>
+        <code
+          >curl -X DELETE {{ request.url_root
+          }}paywall/api/v1/paywalls/&lt;paywall_id&gt; -H "X-Api-Key: {{
+          g.user.wallets[0].adminkey }}"
+        </code>
+      </q-card-section>
     </q-card>
   </q-expansion-item>
 </q-expansion-item>

lnbits/extensions/paywall/templates/paywall/display.html

@@ -1,31 +1,48 @@
 {% extends "public.html" %} {% block page %}
 <div class="row q-col-gutter-md justify-center">
-  <div class="col-12 col-sm-6 col-md-5 col-lg-4">
+  <div class="col-12 col-sm-8 col-md-5 col-lg-4">
     <q-card class="q-pa-lg">
       <q-card-section class="q-pa-none">
-        <h5 class="text-subtitle1 q-my-none">{{ paywall.memo }}</h5>
-        <strong class="text-purple"
-          >Price:
-          <lnbits-fsat :amount="{{ paywall.amount }}"></lnbits-fsat> sat</strong
-        >
-        <q-separator class="q-my-lg"></q-separator>
-        <div v-if="paymentReq">
-          <a :href="'lightning:' + paymentReq">
-            <q-responsive :ratio="1" class="q-mx-xl q-mb-md">
-              <qrcode
-                :value="paymentReq"
-                :options="{width: 800}"
-                class="rounded-borders"
-              ></qrcode>
-            </q-responsive>
-          </a>
-          <div class="row q-mt-lg">
-            <q-btn outline color="grey" @click="copyText(paymentReq)"
-              >Copy invoice</q-btn
+        <h5 class="text-subtitle1 q-mt-none q-mb-sm">{{ paywall.memo }}</h5>
+        {% if paywall.description %}
+          <p>{{ paywall.description }}</p>
+        {% endif %}
+        <div v-if="!this.redirectUrl" class="q-mt-lg">
+          <q-form v-if="">
+            <q-input
+              filled
+              v-model.number="userAmount"
+              type="number"
+              :min="paywallAmount"
+              suffix="sat"
+              label="Choose an amount *"
+              :hint="'Minimum ' + paywallAmount + ' sat'"
             >
+              <template v-slot:after>
+                <q-btn round dense flat icon="check" color="deep-purple" type="submit" @click="createInvoice" :disabled="userAmount < paywallAmount"></q-btn>
+              </template>
+            </q-input>
+          </q-form>
+          <div v-if="paymentReq" class="q-mt-lg">
+            <a :href="'lightning:' + paymentReq">
+              <q-responsive :ratio="1" class="q-mx-xl q-mb-md">
+                <qrcode
+                  :value="paymentReq"
+                  :options="{width: 800}"
+                  class="rounded-borders"
+                ></qrcode>
+              </q-responsive>
+            </a>
+            <div class="row q-mt-lg">
+              <q-btn outline color="grey" @click="copyText(paymentReq)"
+                >Copy invoice</q-btn
+              >
+              <q-btn @click="cancelPayment" flat color="grey" class="q-ml-auto">Cancel</q-btn>
+            </div>
           </div>
         </div>
-        <div v-if="redirectUrl">
+        <div v-else>
+          <q-separator class="q-my-lg"></q-separator>
           <p>
             You can access the URL behind this paywall:<br />
             <strong>{% raw %}{{ redirectUrl }}{% endraw %}</strong>
@@ -39,13 +56,6 @@
       </q-card-section>
     </q-card>
   </div>
-  <div class="col-12 col-sm-6 col-md-5 col-lg-4 q-gutter-y-md">
-    <q-card>
-      <q-card-section>
-        <h6 class="text-subtitle1 q-mb-sm q-mt-none">LNbits paywall</h6>
-      </q-card-section>
-    </q-card>
-  </div>
 </div>
 {% endblock %} {% block scripts %}
 <script src="{{ url_for('static', filename='vendor/vue-qrcode@1.0.2/vue-qrcode.min.js') }}"></script>
@@ -57,25 +67,46 @@
     mixins: [windowMixin],
     data: function () {
       return {
+        userAmount: {{ paywall.amount }},
+        paywallAmount: {{ paywall.amount }},
         paymentReq: null,
-        redirectUrl: null
+        redirectUrl: null,
+        paymentDialog: {
+          dismissMsg: null,
+          checker: null
+        }
+      }
+    },
+    computed: {
+      amount: function () {
+        return (this.paywallAmount > this.userAmount) ? this.paywallAmount : this.userAmount
       }
     },
     methods: {
-      getInvoice: function () {
+      cancelPayment: function () {
+        this.paymentReq = null
+        clearInterval(this.paymentDialog.checker)
+        if (this.paymentDialog.dismissMsg) {
+          this.paymentDialog.dismissMsg()
+        }
+      },
+      createInvoice: function () {
         var self = this
 
         axios
-          .get('/paywall/api/v1/paywalls/{{ paywall.id }}/invoice')
+          .post(
+            '/paywall/api/v1/paywalls/{{ paywall.id }}/invoice',
+            {amount: this.amount}
+          )
           .then(function (response) {
-            self.paymentReq = response.data.payment_request
+            self.paymentReq = response.data.payment_request.toUpperCase()
 
-            dismissMsg = self.$q.notify({
+            self.paymentDialog.dismissMsg = self.$q.notify({
               timeout: 0,
               message: 'Waiting for payment...'
             })
 
-            paymentChecker = setInterval(function () {
+            self.paymentDialog.checker = setInterval(function () {
               axios
                 .post(
                   '/paywall/api/v1/paywalls/{{ paywall.id }}/check_invoice',
@@ -83,13 +114,14 @@
                 )
                 .then(function (res) {
                   if (res.data.paid) {
-                    clearInterval(paymentChecker)
-                    dismissMsg()
+                    self.cancelPayment()
                     self.redirectUrl = res.data.url
-                    self.$q.localStorage.set(
-                      'lnbits.paywall.{{ paywall.id }}',
-                      res.data.url
-                    )
+                    if (res.data.remembers) {
+                      self.$q.localStorage.set(
+                        'lnbits.paywall.{{ paywall.id }}',
+                        res.data.url
+                      )
+                    }
 
                     self.$q.notify({
                       type: 'positive',
@@ -113,8 +145,6 @@
 
       if (url) {
         this.redirectUrl = url
-      } else {
-        this.getInvoice()
       }
     }
   })

lnbits/extensions/paywall/templates/paywall/index.html

@@ -114,7 +114,21 @@
           dense
           v-model.trim="formDialog.data.url"
           type="url"
-          label="Target URL *"
+          label="Redirect URL *"
+        ></q-input>
+        <q-input
+          filled
+          dense
+          v-model.trim="formDialog.data.memo"
+          label="Title *"
+          placeholder="LNbits paywall"
+        ></q-input>
+        <q-input
+          filled
+          dense
+          autogrow
+          v-model.trim="formDialog.data.description"
+          label="Description"
         ></q-input>
         <q-input
           filled
@@ -122,19 +136,31 @@
           v-model.number="formDialog.data.amount"
           type="number"
           label="Amount (sat) *"
+          hint="This is the minimum amount users can pay/donate."
         ></q-input>
-        <q-input
-          filled
-          dense
-          v-model.trim="formDialog.data.memo"
-          label="Memo"
-          placeholder="LNbits invoice"
-        ></q-input>
+        <q-list>
+          <q-item tag="label" class="rounded-borders">
+            <q-item-section avatar>
+              <q-checkbox
+                v-model="formDialog.data.remembers"
+                color="deep-purple"
+              ></q-checkbox>
+            </q-item-section>
+            <q-item-section>
+              <q-item-label
+                >Remember payments</q-item-label
+              >
+              <q-item-label caption
+                >A succesful payment will be registered in the browser's storage, so the user doesn't need to pay again to access the URL.</q-item-label
+              >
+            </q-item-section>
+          </q-item>
+        </q-list>
         <div class="row q-mt-lg">
           <q-btn
             unelevated
             color="deep-purple"
-            :disable="formDialog.data.amount == null || formDialog.data.amount < 0 || formDialog.data.url == null"
+            :disable="formDialog.data.amount == null || formDialog.data.amount < 0 || formDialog.data.url == null || formDialog.data.memo == null"
             type="submit"
             >Create paywall</q-btn
           >
@@ -168,13 +194,6 @@
           columns: [
             {name: 'id', align: 'left', label: 'ID', field: 'id'},
             {name: 'memo', align: 'left', label: 'Memo', field: 'memo'},
-            {
-              name: 'date',
-              align: 'left',
-              label: 'Date',
-              field: 'date',
-              sortable: true
-            },
             {
               name: 'amount',
               align: 'right',
@@ -184,6 +203,14 @@
               sort: function (a, b, rowA, rowB) {
                 return rowA.amount - rowB.amount
               }
+            },
+            {name: 'remembers', align: 'left', label: 'Remember', field: 'remembers'},
+            {
+              name: 'date',
+              align: 'left',
+              label: 'Date',
+              field: 'date',
+              sortable: true
             }
           ],
           pagination: {
@@ -192,7 +219,9 @@
         },
         formDialog: {
           show: false,
-          data: {}
+          data: {
+            remembers: false
+          }
         }
       }
     },
@@ -216,7 +245,9 @@
         var data = {
           url: this.formDialog.data.url,
           memo: this.formDialog.data.memo,
-          amount: this.formDialog.data.amount
+          amount: this.formDialog.data.amount,
+          description: this.formDialog.data.description,
+          remembers: this.formDialog.data.remembers
         }
         var self = this
 
@@ -231,7 +262,9 @@
           .then(function (response) {
             self.paywalls.push(mapPaywall(response.data))
             self.formDialog.show = false
-            self.formDialog.data = {}
+            self.formDialog.data = {
+              remembers: false
+            }
           })
           .catch(function (error) {
             LNbits.utils.notifyApiError(error)

lnbits/extensions/paywall/views_api.py

@@ -27,7 +27,9 @@ def api_paywalls():
     schema={
         "url": {"type": "string", "empty": False, "required": True},
         "memo": {"type": "string", "empty": False, "required": True},
+        "description": {"type": "string", "empty": True, "nullable": True, "required": False},
         "amount": {"type": "integer", "min": 0, "required": True},
+        "remembers": {"type": "boolean", "required": True},
     }
 )
 def api_paywall_create():
@@ -52,18 +54,23 @@ def api_paywall_delete(paywall_id):
     return "", HTTPStatus.NO_CONTENT
 
 
-@paywall_ext.route("/api/v1/paywalls/<paywall_id>/invoice", methods=["GET"])
-def api_paywall_get_invoice(paywall_id):
+@paywall_ext.route("/api/v1/paywalls/<paywall_id>/invoice", methods=["POST"])
+@api_validate_post_request(schema={"amount": {"type": "integer", "min": 1, "required": True}})
+def api_paywall_create_invoice(paywall_id):
     paywall = get_paywall(paywall_id)
 
+    if g.data["amount"] < paywall.amount:
+        return jsonify({"message": f"Minimum amount is {paywall.amount} sat."}), HTTPStatus.BAD_REQUEST
+
     try:
+        amount = g.data["amount"] if g.data["amount"] > paywall.amount else paywall.amount
         checking_id, payment_request = create_invoice(
-            wallet_id=paywall.wallet, amount=paywall.amount, memo=f"#paywall {paywall.memo}"
+            wallet_id=paywall.wallet, amount=amount, memo=f"#paywall {paywall.memo}"
         )
     except Exception as e:
         return jsonify({"message": str(e)}), HTTPStatus.INTERNAL_SERVER_ERROR
 
-    return jsonify({"checking_id": checking_id, "payment_request": payment_request}), HTTPStatus.OK
+    return jsonify({"checking_id": checking_id, "payment_request": payment_request}), HTTPStatus.CREATED
 
 
 @paywall_ext.route("/api/v1/paywalls/<paywall_id>/check_invoice", methods=["POST"])
@@ -84,6 +91,6 @@ def api_paywal_check_invoice(paywall_id):
         payment = wallet.get_payment(g.data["checking_id"])
         payment.set_pending(False)
 
-        return jsonify({"paid": True, "url": paywall.url}), HTTPStatus.OK
+        return jsonify({"paid": True, "url": paywall.url, "remembers": paywall.remembers}), HTTPStatus.OK
 
     return jsonify({"paid": False}), HTTPStatus.OK