feat: L402 for image/video

packages/app/src/Element/MediaElement.tsx

@@ -1,9 +1,16 @@
 import { ProxyImg } from "Element/ProxyImg";
-import React, { MouseEvent, useState } from "react";
+import React, { MouseEvent, useEffect, useState } from "react";
+import { FormattedMessage, FormattedNumber } from "react-intl";
 
 import "./MediaElement.css";
 import Modal from "Element/Modal";
 import Icon from "Icons/Icon";
+import { decodeInvoice, InvoiceDetails, kvToObject } from "Util";
+import AsyncButton from "Element/AsyncButton";
+import { useWallet } from "Wallet";
+import { PaymentsCache } from "Cache/PaymentsCache";
+import { Payment } from "Db";
+import PageSpinner from "Element/PageSpinner";
 
 /*
 [
@@ -21,19 +28,137 @@ interface MediaElementProps {
   blurHash?: string;
 }
 
+interface L402Object {
+  macaroon: string;
+  invoice: string;
+}
+
 export function MediaElement(props: MediaElementProps) {
+  const [invoice, setInvoice] = useState<InvoiceDetails>();
+  const [l402, setL402] = useState<L402Object>();
+  const [auth, setAuth] = useState<Payment>();
+  const [error, setError] = useState("");
+  const [url, setUrl] = useState(props.url);
+  const [loading, setLoading] = useState(false);
+  const wallet = useWallet();
+
+  async function probeFor402() {
+    const cached = await PaymentsCache.get(props.url);
+    if (cached) {
+      setAuth(cached);
+      return;
+    }
+
+    const req = new Request(props.url, {
+      method: "OPTIONS",
+      headers: {
+        accept: "L402",
+      },
+    });
+    const rsp = await fetch(req);
+    if (rsp.status === 402) {
+      const auth = rsp.headers.get("www-authenticate");
+      if (auth?.startsWith("L402")) {
+        const vals = kvToObject<L402Object>(auth.substring(5));
+        console.debug(vals);
+        setL402(vals);
+
+        if (vals.invoice) {
+          const decoded = decodeInvoice(vals.invoice);
+          setInvoice(decoded);
+        }
+      }
+    }
+  }
+
+  async function payInvoice() {
+    if (wallet.wallet && l402) {
+      try {
+        const res = await wallet.wallet.payInvoice(l402.invoice);
+        console.debug(res);
+        if (res.preimage) {
+          const pmt = {
+            pr: l402.invoice,
+            url: props.url,
+            macaroon: l402.macaroon,
+            preimage: res.preimage,
+          };
+          await PaymentsCache.set(pmt);
+          setAuth(pmt);
+        }
+      } catch (e) {
+        if (e instanceof Error) {
+          setError(e.message);
+        }
+      }
+    }
+  }
+
+  async function loadMedia() {
+    if (!auth) return;
+    setLoading(true);
+
+    const mediaReq = new Request(props.url, {
+      headers: {
+        Authorization: `L402 ${auth.macaroon}:${auth.preimage}`,
+      },
+    });
+    const rsp = await fetch(mediaReq);
+    if (rsp.ok) {
+      const buf = await rsp.blob();
+      setUrl(URL.createObjectURL(buf));
+    }
+    setLoading(false);
+  }
+
+  useEffect(() => {
+    if (auth) {
+      loadMedia().catch(console.error);
+    }
+  }, [auth]);
+
+  if (auth && loading) {
+    return <PageSpinner />;
+  }
+
+  if (invoice) {
+    return (
+      <div className="note-invoice">
+        <h3>
+          <FormattedMessage defaultMessage="Payment Required" />
+        </h3>
+        <div className="flex f-row">
+          <div className="f-grow">
+            <FormattedMessage
+              defaultMessage="You must pay {n} sats to access this file."
+              values={{
+                n: <FormattedNumber value={(invoice.amount ?? 0) / 1000} />,
+              }}
+            />
+          </div>
+          <div>
+            <AsyncButton onClick={() => payInvoice()}>
+              <FormattedMessage defaultMessage="Pay Now" />
+            </AsyncButton>
+          </div>
+        </div>
+        {error && <b className="error">{error}</b>}
+      </div>
+    );
+  }
+
   if (props.mime.startsWith("image/")) {
     return (
       <SpotlightMedia>
-        <ProxyImg key={props.url} src={props.url} />
+        <ProxyImg key={props.url} src={url} onError={() => probeFor402()} />
       </SpotlightMedia>
     );
   } else if (props.mime.startsWith("audio/")) {
-    return <audio key={props.url} src={props.url} controls />;
+    return <audio key={props.url} src={url} controls onError={() => probeFor402()} />;
   } else if (props.mime.startsWith("video/")) {
     return (
       <SpotlightMedia>
-        <video key={props.url} src={props.url} controls />
+        <video key={props.url} src={url} controls onError={() => probeFor402()} />
       </SpotlightMedia>
     );
   } else {