add journal parser

react/src/JournalParser.js

@@ -0,0 +1,189 @@
+import React, { useEffect, useMemo, useState } from 'react';
+import { JSONTree } from "react-json-tree";
+import Markdown from "react-markdown";
+
+const DEFAULT_REGISTRY = 'https://raw.githubusercontent.com/cameronfyfe/risc0-journal-parser-registry/main/registry.json';
+
+const cssPrefix = "risc-zero-journal-parser";
+
+function cssClass(className) {
+  return `${cssPrefix}-${className}`;
+}
+
+function JournalParser({
+  guestCodeId,
+  journalBytes,
+  registryUrl = DEFAULT_REGISTRY,
+  ipfsGateway = "https://ipfs.io",
+}) {
+  const journalBytesString = useMemo(() =>
+    journalBytes ? JSON.stringify(Array.from(journalBytes)) : null,
+    [journalBytes]
+  );
+
+  const [registry, setRegistry] = useState([]);
+  useEffect(() => {
+    (async () => {
+      try {
+        const response = await fetch(registryUrl);
+        const json = await response.json();
+        setRegistry(json);
+      } catch {
+        setRegistry(null);
+      }
+    })();
+  }, [registryUrl]);
+
+  const parsers = useMemo(() => {
+    if (registry && guestCodeId) {
+      return registry.parsers.filter((parser) =>
+        parser.guestCodeId === guestCodeId
+      );
+    }
+  }, [registry, guestCodeId]);
+
+  const [selectedParserIndex, setSelectedParserIndex] = useState(undefined);
+
+  useEffect(() => {
+    if (parsers && parsers.length > 0) {
+      setSelectedParserIndex(0);
+    } else {
+      setSelectedParserIndex(undefined);
+    }
+  }, [parsers]);
+
+  const selectedParser = useMemo(
+    () => selectedParserIndex != undefined ? parsers[selectedParserIndex] : null,
+    [parsers, selectedParserIndex],
+  );
+
+  const wasmEntryUrl = useMemo(
+    () =>
+      selectedParser
+        ? selectedParser.journalParser.protocol === "ipfs"
+          ? `${ipfsGateway}/ipfs/${selectedParser.journalParser.src}`
+          : null
+        : null,
+    [selectedParser],
+  );
+
+  const [wasmModule, setWasmModule] = useState(null);
+  useEffect(() => {
+    if (wasmEntryUrl) {
+      (async () => {
+        // TODO: This is a hack to get around the fact that import() doesn't work with dynamic URLs
+        //       when webpack/babel are configured to statically resolve imports.
+        //       It's easy to disable globally in .babelrc, but then the
+        //       'import("@eqtylab/risc-zero-verifier")' in Verifier.js breaks.
+        //       This hack works for now but is not ideal. We need to be careful what the value of
+        //       wasmEntryUrl is to use this method with eval().
+        const wm = await eval(`import("${wasmEntryUrl}")`);
+        await wm.default();
+        setWasmModule(wm);
+      })();
+    } else {
+      setWasmModule(null);
+    }
+  }, [wasmEntryUrl]);
+
+  const getJsonObjectFromReceiptBinary = useMemo(() =>
+    wasmModule && wasmModule.json_obj_from_journal_bytes || null,
+    [wasmModule]
+  );
+
+  const getStatementFromReceiptBinary = useMemo(() =>
+    wasmModule && wasmModule.statement_from_journal_bytes || null,
+    [wasmModule]
+  );
+
+  const [journalObj, setJournalObj] = useState(null);
+  useEffect(() => {
+    (async () => {
+      if (journalBytes && getJsonObjectFromReceiptBinary) {
+        try {
+          const obj = await getJsonObjectFromReceiptBinary(journalBytes);
+          setJournalObj(obj);
+        } catch {
+          setJournalObj(null);
+        }
+      } else {
+        setJournalObj(null);
+      }
+    })();
+  }, [journalBytes, getJsonObjectFromReceiptBinary]);
+
+  const [statement, setStatement] = useState(null);
+  useEffect(() => {
+    (async () => {
+      if (journalBytes && getStatementFromReceiptBinary) {
+        try {
+          const stmt = await getStatementFromReceiptBinary(journalBytes);
+          setStatement(stmt);
+        } catch {
+          setStatement(null);
+        }
+      } else {
+        setStatement(null);
+      }
+    })();
+  }, [journalBytes, getStatementFromReceiptBinary]);
+
+  return (
+    <div>
+      Journal Parser:
+      <br />
+      {guestCodeId ? (
+        <select
+          value={selectedParserIndex}
+          onChange={(e) => setSelectedParserIndex(e.target.value)}
+        >
+          {parsers.map((parser, i) => (
+            <option key={i} value={i}>
+              {parser.profile.name} {parser.profile.version}
+            </option>
+          ))}
+        </select>
+      ) : (
+        <p><i>No parsers available for this guest code id.</i></p>
+      )}
+
+      <br /><br />
+
+      {statement &&
+        <div>
+          Statement:
+          <br />
+          <Markdown className={cssClass("statement-markdown")}>{statement}</Markdown>
+        </div>
+      }
+
+      <br /><br />
+
+      {journalObj &&
+        <div>
+          Journal (JSON):
+          <br />
+          <div>
+            <JSONTree data={journalObj} />
+          </div>
+        </div>
+      }
+
+      <br /><br />
+
+      {journalBytesString &&
+        <div>
+          Journal (RAW):
+          <br />
+          <textarea className={cssClass("journal-raw")}
+            value={journalBytesString}
+            readOnly={true}
+          />
+        </div>
+      }
+
+    </div>
+  );
+}
+
+export default JournalParser;

react/src/Verifier.js

@@ -1,8 +1,9 @@
-import React, { useEffect, useState } from 'react';
+import React, { useEffect, useMemo, useState } from 'react';
+import JournalParser from './JournalParser.js';
 
 const cssPrefix = "risc-zero-verifier";
 
-const defaultText = {
+export const defaultText = {
   verifyButtonLabel: "Verify",
   instructions: "Upload a receipt file as JSON or binary (bincode format), or paste it as JSON into the form field.",
   fieldLabels: {
@@ -20,7 +21,12 @@ const defaultText = {
   }
 }
 
-function Verifier({text = defaultText, instanceNumber = 0}) {
+function Verifier({
+  text = defaultText,
+  instanceNumber = 0,
+  enableJournalParser = false,
+  ipfsGateway = "https://ipfs.io",
+}) {
   const [verifier, setVerifier] = useState(null);
 
   useEffect(() => {
@@ -36,6 +42,16 @@ function Verifier({text = defaultText, instanceNumber = 0}) {
   const [receiptJson, setReceiptJson] = useState('');
   const [verificationResult, setVerificationResult] = useState('');
 
+  const receiptJournalBytes = useMemo(() => {
+    try {
+      const journal = JSON.parse(receiptJson).journal;
+      const journalBytes = new Uint8Array(journal.bytes);
+      return journalBytes;
+    } catch {
+      return null;
+    }
+  }, [receiptJson]);
+
   async function verifyRiscZeroReceipt(guestCodeId, receiptJson) {
     if (!guestCodeId) {
       return text.errors.guestCodeIdMissing;
@@ -120,6 +136,19 @@ function Verifier({text = defaultText, instanceNumber = 0}) {
         <button id={cssId("verify-button")} onClick={async () => setVerificationResult(await verifyRiscZeroReceipt(guestCodeId, receiptJson))}>{text.verifyButtonLabel}</button>
       </div>
       <div className={cssClass("receipt-verification-result")}>{verificationResult}</div>
+
+      <br/><br/>
+      <hr/>
+      <br/><br/>
+
+      {enableJournalParser && (
+        <JournalParser
+          guestCodeId={guestCodeId}
+          journalBytes={receiptJournalBytes}
+          ipfsGateway={ipfsGateway}
+        />
+      )}
+
     </div>
   );
 }