Feature: Support signing in the provider (#218)

* support eth_sign/personal_sign in safe-apps-provider

* include dist files

* Add gitattributes file to ignore dist files in diff

* fix gitattrs

* fix format-dist in safe-apps-sdk to work on linux

.changeset/healthy-experts-heal.md

@@ -0,0 +1,5 @@
+---
+'@gnosis.pm/safe-apps-provider': minor
+---
+
+support eth_sign and personal_sign

.gitattributes

@@ -0,0 +1 @@
+dist linguist-generated=true

packages/safe-apps-provider/src/provider.ts

@@ -56,6 +56,30 @@ export class SafeAppProvider implements EIP1193Provider {
       case 'eth_chainId':
         return `0x${this.chainId.toString(16)}`;
 
+      case 'personal_sign': {
+        const [message, address] = params;
+
+        if (this.safe.safeAddress.toLowerCase() !== address.toLowerCase()) {
+          throw new Error('The address or message hash is invalid');
+        }
+
+        await this.sdk.txs.signMessage(message);
+
+        return '0x';
+      }
+
+      case 'eth_sign': {
+        const [address, messageHash] = params;
+
+        if (this.safe.safeAddress.toLowerCase() !== address.toLowerCase() || !messageHash.startsWith('0x')) {
+          throw new Error('The address or message hash is invalid');
+        }
+
+        await this.sdk.txs.signMessage(messageHash);
+
+        return '0x';
+      }
+
       case 'eth_sendTransaction':
         const tx = {
           value: '0',

packages/safe-apps-sdk/dist/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@gnosis.pm/safe-apps-sdk",
-    "version": "4.3.0-next.1",
+    "version": "4.3.0-next.2",
     "description": "SDK developed to integrate third-party apps with Safe-Multisig app.",
     "main": "dist/src/index.js",
     "typings": "dist/src/index.d.ts",
@@ -15,7 +15,7 @@
     ],
     "scripts": {
         "test": "jest",
-        "format-dist": "sed -i '' 's/\"files\":/\"_files\":/' dist/package.json",
+        "format-dist": "sed -i 's/\"files\":/\"_files\":/' dist/package.json",
         "build": "yarn rimraf dist && tsc && yarn format-dist",
         "lint": "tslint -p tsconfig.json"
     },