Feat: bip32 package with blinded xpub support (#126)

* cleanup and fix generator templates

* init bip32 package with paths utils

* fix: eslint and add import ordering

* split up key and path modules and add tests

* custom util for getting random ints in node or browser

* use custom random int for blinded paths

* util for getting blinded xpub from source

* feat: blind xpub support for text input

* make new bip32 package publishable

* feat: reused functionality extracted to a utility for getting relative child sequence

Author: bucko13

apps/coordinator/package.json

@@ -94,6 +94,7 @@
     "not op_mini all"
   ],
   "dependencies": {
+    "@caravan/bip32": "*",
     "@caravan/bitcoin": "*",
     "@caravan/clients": "*",
     "@caravan/descriptors": "^0.1.1",

apps/coordinator/src/components/Coldcard/ColdcardFileReader.jsx

@@ -2,7 +2,7 @@
 import React from "react";
 import PropTypes from "prop-types";
 import Dropzone from "react-dropzone";
-import { Buffer } from "buffer/";
+import { Buffer } from "buffer";
 import { Box, Button, FormHelperText, Grid, TextField } from "@mui/material";
 import { CloudUpload as UploadIcon } from "@mui/icons-material";
 import { PSBT_MAGIC_HEX } from "@caravan/bitcoin";

apps/coordinator/src/components/Wallet/ExtendedPublicKeyImporter.jsx

@@ -89,7 +89,9 @@ class ExtendedPublicKeyImporter extends React.Component {
             <MenuItem value={TEXT}>Enter as text</MenuItem>
           </TextField>
         </FormControl>
-        <FormControl>{this.renderImportByMethod()}</FormControl>
+        <FormControl style={{ width: "100%" }}>
+          {this.renderImportByMethod()}
+        </FormControl>
       </div>
     );
   };

apps/coordinator/src/components/Wallet/TextExtendedPublicKeyImporter.jsx

@@ -0,0 +1,108 @@
+import React, { useEffect, useState } from "react";
+
+// Components
+import {
+  TextField,
+  Box,
+  Button,
+  Grid,
+  Alert,
+  AlertTitle,
+  Typography,
+} from "@mui/material";
+import { Network, validateExtendedPublicKey } from "@caravan/bitcoin";
+import { getBlindedXpub } from "@caravan/bip32";
+import Copyable from "../Copyable";
+
+const TextExtendedPublicKeyImporter = ({
+  validateAndSetExtendedPublicKey,
+  network,
+}: {
+  validateAndSetExtendedPublicKey: (
+    extendedPublicKey: string,
+    errCb: (e: string) => void,
+  ) => void;
+  network: Network;
+}) => {
+  const [error, setError] = useState("");
+  const [xpub, setXpub] = useState("");
+  const [original, setOriginal] = useState("");
+  const [blindedPath, setBlindedPath] = useState("");
+
+  const handleSubmit = () => {
+    validateAndSetExtendedPublicKey(xpub, setError);
+  };
+
+  const handleBlind = () => {
+    setOriginal(xpub);
+    const blinded = getBlindedXpub(xpub);
+    setXpub(blinded.xpub);
+    setBlindedPath(blinded.bip32Path);
+  };
+
+  useEffect(() => {
+    if (xpub) {
+      const error = validateExtendedPublicKey(xpub, network);
+      setError(error);
+    }
+  }, [xpub]);
+
+  return (
+    <Box mt={2}>
+      <TextField
+        fullWidth
+        name="publicKey"
+        label="Extended Public Key"
+        value={xpub}
+        variant="standard"
+        onChange={(e) => setXpub(e.target.value)}
+        error={error !== ""}
+        helperText={error}
+        multiline
+        disabled={Boolean(original && blindedPath)}
+      />
+      <Grid container style={{ marginTop: "12px" }} spacing={2}>
+        <Grid item>
+          <Button onClick={handleSubmit} variant="contained" color="primary">
+            Enter
+          </Button>
+        </Grid>
+        <Grid item>
+          <Button
+            variant="outlined"
+            color="info"
+            disabled={!(!error && xpub)}
+            onClick={handleBlind}
+          >
+            Blind
+          </Button>
+        </Grid>
+      </Grid>
+      {blindedPath && original && (
+        <Box my={4}>
+          <Alert variant="outlined" severity="warning">
+            <AlertTitle>
+              <h3 style={{ marginTop: "0px" }}>
+                Blinded Info (IMPORTANT: Save this info)
+              </h3>
+            </AlertTitle>
+            <Typography my={1}>
+              <strong>
+                Without the full bip32 path, your funds will be irrecoverable
+              </strong>
+              . This notice will disappear once you hit &quot;Enter&quot;.
+            </Typography>
+            <Typography variant="h6">Blinded Path:</Typography>
+            <Copyable showIcon text={blindedPath} />
+            <Typography variant="h6"> Source Xpub:</Typography>
+            <Copyable showIcon text={original} />
+            <Typography variant="h6">Blinded Xpub:</Typography>
+            <Copyable showIcon text={xpub} />
+          </Alert>
+        </Box>
+      )}
+    </Box>
+  );
+};
+
+export default TextExtendedPublicKeyImporter;