Add first version of phishing site warning

Links to my own blacklist for now, since I added a package.json for easy importing.

We can point at the main 408H repository once this is merged:
https://github.com/409H/EtherAddressLookup/pull/24

Redirects detected phishing sites [here](https://metamask.io/phishing.html).

2 files changed, 19 insertions, 0 deletions

diff --git a/app/manifest.json b/app/manifest.json
index f3a1ebeff..ac6364059 100644
--- a/app/manifest.json
+++ b/app/manifest.json
@@ -52,6 +52,12 @@
       ],
       "run_at": "document_start",
       "all_frames": true
+    },
+    {
+      "run_at": "document_end",
+      "matches": ["http://*/*", "https://*/*"],
+      "js": ["scripts/blacklister.js"],
+      "css": ["css/blacklister.css"]
     }
   ],
   "permissions": [
diff --git a/app/scripts/blacklister.js b/app/scripts/blacklister.js
new file mode 100644
index 000000000..a45265a75
--- /dev/null
+++ b/app/scripts/blacklister.js
@@ -0,0 +1,13 @@
+const blacklistedDomains = require('etheraddresslookup/blacklists/domains.json')

+

+function detectBlacklistedDomain() {

+  var strCurrentTab = window.location.hostname

+  if (blacklistedDomains && blacklistedDomains.includes(strCurrentTab)) {

+    window.location.href = 'https://metamask.io/phishing.html'

+  }

+}

+

+window.addEventListener('load', function() {

+  detectBlacklistedDomain()

+})

+