From 150b35c4c7070c663603146b18e223d8b478d236 Mon Sep 17 00:00:00 2001
From: Matthew Aaron Raymer <matthew.raymer@anomalistdesign.com>
Date: Fri, 6 Jan 2023 17:30:41 +0800
Subject: [PATCH] Update with our own SimpleSigner

---
 src/libs/crypto/index.ts         | 56 +++++++++++++++++++++++
 src/views/NewEditProjectView.vue | 76 ++++++++++++++++++--------------
 2 files changed, 100 insertions(+), 32 deletions(-)

diff --git a/src/libs/crypto/index.ts b/src/libs/crypto/index.ts
index db16413..8d8df5a 100644
--- a/src/libs/crypto/index.ts
+++ b/src/libs/crypto/index.ts
@@ -5,8 +5,44 @@ import { entropyToMnemonic } from "ethereum-cryptography/bip39";
 import { wordlist } from "ethereum-cryptography/bip39/wordlists/english";
 import { HDNode } from "@ethersproject/hdnode";
 import * as didJwt from "did-jwt";
+import { Signer } from "did-jwt";
 import * as u8a from "uint8arrays";
 
+export function hexToBytes(s: string): Uint8Array {
+  const input = s.startsWith("0x") ? s.substring(2) : s;
+  return u8a.fromString(input.toLowerCase(), "base16");
+}
+
+export function fromJose(signature: string): {
+  r: string;
+  s: string;
+  recoveryParam?: number;
+} {
+  const signatureBytes: Uint8Array = base64ToBytes(signature);
+  if (signatureBytes.length < 64 || signatureBytes.length > 65) {
+    throw new TypeError(
+      `Wrong size for signature. Expected 64 or 65 bytes, but got ${signatureBytes.length}`
+    );
+  }
+  const r = bytesToHex(signatureBytes.slice(0, 32));
+  const s = bytesToHex(signatureBytes.slice(32, 64));
+  const recoveryParam =
+    signatureBytes.length === 65 ? signatureBytes[64] : undefined;
+  return { r, s, recoveryParam };
+}
+
+export function bytesToHex(b: Uint8Array): string {
+  return u8a.toString(b, "base16");
+}
+
+export function base64ToBytes(s: string): Uint8Array {
+  const inputBase64Url = s
+    .replace(/\+/g, "-")
+    .replace(/\//g, "_")
+    .replace(/=/g, "");
+  return u8a.fromString(inputBase64Url, "base64url");
+}
+
 /**
  *
  *
@@ -111,3 +147,23 @@ export const sign = async (privateKeyHex: string) => {
 
   return signer;
 };
+
+/**
+ *  The SimpleSigner returns a configured function for signing data.
+ *
+ *  @example
+ *  const signer = SimpleSigner(process.env.PRIVATE_KEY)
+ *  signer(data, (err, signature) => {
+ *    ...
+ *  })
+ *
+ *  @param    {String}         hexPrivateKey    a hex encoded private key
+ *  @return   {Function}                     a configured signer function
+ */
+export const SimpleSigner = async (hexPrivateKey: string): Promise<Signer> => {
+  const signer = didJwt.ES256KSigner(hexToBytes(hexPrivateKey), true);
+  return async (data) => {
+    const signature = (await signer(data)) as string;
+    return fromJose(signature);
+  };
+};
diff --git a/src/views/NewEditProjectView.vue b/src/views/NewEditProjectView.vue
index 211ec0c..bff74d3 100644
--- a/src/views/NewEditProjectView.vue
+++ b/src/views/NewEditProjectView.vue
@@ -74,8 +74,9 @@
 import { Options, Vue } from "vue-class-component";
 import { AppString } from "@/constants/app";
 import { db } from "../db";
-import { accessToken, sign } from "@/libs/crypto";
+import { accessToken, SimpleSigner } from "@/libs/crypto";
 import * as didJwt from "did-jwt";
+import { IIdentifier } from "@veramo/core";
 
 @Options({
   components: {},
@@ -84,40 +85,39 @@ export default class NewEditProjectView extends Vue {
   projectName = "";
   description = "";
 
-  public async onSaveProjectClick() {
-    await db.open();
-    const num_accounts = await db.accounts.count();
-    if (num_accounts === 0) {
-      console.log("Problem!  Should have a profile!");
-    } else {
-      const accounts = await db.accounts.toArray();
-      const identity = JSON.parse(accounts[0].identity);
-      const address = identity.did;
-      // Make a claim
-      const vcClaim = {
-        "@context": "https://schema.org",
-        "@type": "PlanAction",
-        identifier: address,
-        name: this.projectName,
-        description: this.description,
-      };
-      // Make a payload for the claim
-      const vcPayload = {
-        sub: "PlanAction",
-        vc: {
-          "@context": ["https://www.w3.org/2018/credentials/v1"],
-          type: ["VerifiableCredential"],
-          credentialSubject: vcClaim,
-        },
-      };
-      // create a signature using private key of identity
-      const signer = await sign(identity.keys[0].privateKeyHex);
+  private async SaveProject(identity: IIdentifier) {
+    const address = identity.did;
+    // Make a claim
+    const vcClaim = {
+      "@context": "https://schema.org",
+      "@type": "PlanAction",
+      identifier: address,
+      name: this.projectName,
+      description: this.description,
+    };
+    // Make a payload for the claim
+    const vcPayload = {
+      sub: "PlanAction",
+      vc: {
+        "@context": ["https://www.w3.org/2018/credentials/v1"],
+        type: ["VerifiableCredential"],
+        credentialSubject: vcClaim,
+      },
+    };
+    // create a signature using private key of identity
+    if (
+      identity.keys[0].privateKeyHex !== "undefined" &&
+      identity.keys[0].privateKeyHex !== null
+    ) {
+      // eslint-disable-next-line
+      const privateKeyHex: string = identity.keys[0].privateKeyHex!;
+      const signer = await SimpleSigner(privateKeyHex);
       const alg = undefined;
       // create a JWT for the request
       const vcJwt: string = await didJwt.createJWT(vcPayload, {
-        alg,
-        issuer: identity,
-        signer,
+        alg: alg,
+        issuer: identity.did,
+        signer: signer,
       });
 
       // Make the xhr request payload
@@ -140,6 +140,18 @@ export default class NewEditProjectView extends Vue {
     }
   }
 
+  public async onSaveProjectClick() {
+    await db.open();
+    const num_accounts = await db.accounts.count();
+    if (num_accounts === 0) {
+      console.log("Problem!  Should have a profile!");
+    } else {
+      const accounts = await db.accounts.toArray();
+      const identity = JSON.parse(accounts[0].identity);
+      this.SaveProject(identity);
+    }
+  }
+
   public onCancelClick() {
     this.$router.back();
   }