From abd4ccac1e980c42d854ab29bf5aff8a1e6dce3e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20Guti=C3=A9rrez?= <pedrogp9693@gmail.com>
Date: Wed, 8 May 2019 12:29:32 +0200
Subject: [PATCH] Add a error message if localStorage is not available.

---
 integration/ocean/AuthenticationToken.test.ts |  4 +++-
 src/ocean/OceanAuth.ts                        | 18 +++++++++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/integration/ocean/AuthenticationToken.test.ts b/integration/ocean/AuthenticationToken.test.ts
index 47324e9..f269671 100644
--- a/integration/ocean/AuthenticationToken.test.ts
+++ b/integration/ocean/AuthenticationToken.test.ts
@@ -11,7 +11,9 @@ describe("Authentication Token", () => {
     let account2: Account
 
     before(async () => {
-        localStorage.clear()
+        try {
+            localStorage.clear()
+        } catch { }
 
         ocean = await Ocean.getInstance(config)
 
diff --git a/src/ocean/OceanAuth.ts b/src/ocean/OceanAuth.ts
index 1acd9f8..316cd3f 100644
--- a/src/ocean/OceanAuth.ts
+++ b/src/ocean/OceanAuth.ts
@@ -79,7 +79,12 @@ export class OceanAuth extends Instantiable {
      * @param {Account} account Signer account.
      */
     public async restore(account: Account): Promise<string> {
-        const token = this.readToken(account.getId())
+        let token
+        try {
+            token = this.readToken(account.getId())
+        } catch {
+            return
+        }
         if (!token) {
             return
         }
@@ -100,6 +105,7 @@ export class OceanAuth extends Instantiable {
     }
 
     private writeToken(address: string, token: string) {
+        const localStorage = this.getLocalStorage()
         const storedTokens = localStorage.getItem(localStorageKey)
         const tokens = storedTokens ? JSON.parse(storedTokens) : {}
 
@@ -110,9 +116,19 @@ export class OceanAuth extends Instantiable {
     }
 
     private readToken(address: string) {
+        const localStorage = this.getLocalStorage()
         const storedTokens = localStorage.getItem(localStorageKey)
         const tokens = storedTokens ? JSON.parse(storedTokens) : {}
 
         return tokens[address]
     }
+
+    private getLocalStorage() {
+        try {
+            localStorage.getItem("")
+        } catch {
+            throw new Error("LocalStorage is not supported. This feature is only available on browsers.")
+        }
+        return localStorage
+    }
 }