Set Sentry user id to hashed identifier (#904)

We calculate the ID of the user by hashing the address. This way we
won't store any sensitive information in Sentry.

dapp/src/sentry.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it, vi } from "vitest"
+import * as Sentry from "@sentry/react"
+import sentry from "./sentry"
+
+describe("sentry", () => {
+  describe("setUser", () => {
+    vi.mock("@sentry/react")
+
+    const testCases = [
+      { bitcoinAddress: undefined, expectedResult: null },
+      { bitcoinAddress: "", expectedResult: null },
+      { bitcoinAddress: " ", expectedResult: null },
+      {
+        bitcoinAddress: "17VZNX1SN5NtKa8UQFxwQbFeFc3iqRYhem",
+        expectedResult: { id: "1f520a9757" },
+      },
+      {
+        bitcoinAddress: "bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4",
+        expectedResult: { id: "6cd42dab02" },
+      },
+      {
+        bitcoinAddress: "BC1QW508D6QEJXTDG4Y5R3ZARVARY0C5XW7KV8F3T4",
+        expectedResult: { id: "6cd42dab02" },
+      },
+    ]
+
+    describe.each(testCases)(
+      "when address is $bitcoinAddress",
+      ({ bitcoinAddress, expectedResult }) => {
+        it("should set expected user in Sentry", () => {
+          sentry.setUser(bitcoinAddress)
+
+          expect(Sentry.setUser).toHaveBeenCalledWith(expectedResult)
+        })
+      },
+    )
+  })
+})

dapp/src/sentry/index.ts → dapp/src/sentry.ts

@@ -1,4 +1,5 @@
 import * as Sentry from "@sentry/react"
+import { sha256, toUtf8Bytes } from "ethers"
 
 const initialize = (dsn: string) => {
   Sentry.init({
@@ -17,8 +18,26 @@ const initialize = (dsn: string) => {
   })
 }
 
+/**
+ * Sets the user in Sentry with an ID from hashed Bitcoin address.
+ * The Bitcoin address is first converted to lowercase and then hashed using SHA-256.
+ * The resulting hash is then converted to a hexadecimal string and the first 10
+ * characters are set as the user ID.
+ *
+ * @param bitcoinAddress - The Bitcoin address of the user. If undefined, the user
+ * is set to null in Sentry.
+ */
 const setUser = (bitcoinAddress: string | undefined) => {
-  Sentry.setUser(bitcoinAddress ? { id: bitcoinAddress } : null)
+  if (!bitcoinAddress) {
+    Sentry.setUser(null)
+    return
+  }
+
+  const hashedBitcoinAddress = sha256(toUtf8Bytes(bitcoinAddress.toLowerCase()))
+  // Remove the 0x prefix and take the first 10 characters.
+  const id = hashedBitcoinAddress.slice(2, 12)
+
+  Sentry.setUser({ id })
 }
 
 const captureException = (exception: unknown) =>