Bug 1544533 - Add a policy for local file links. r=Felipe,flod

Differential Revision: https://phabricator.services.mozilla.com/D27566

--HG--
extra : moz-landing-system : lando

browser/components/enterprisepolicies/Policies.jsm

@@ -679,6 +679,17 @@ var Policies = {
     },
   },
 
+  "LocalFileLinks": {
+    onBeforeAddons(manager, param) {
+      // If there are existing capabilities, lock them with the policy pref.
+      let policyNames = Services.prefs.getCharPref("capability.policy.policynames", "").split(" ");
+      policyNames.push("localfilelinks_policy");
+      setAndLockPref("capability.policy.policynames", policyNames.join(" "));
+      setAndLockPref("capability.policy.localfilelinks_policy.checkloaduri.enabled", "allAccess");
+      setAndLockPref("capability.policy.localfilelinks_policy.sites", param.join(" "));
+    },
+  },
+
   "NetworkPrediction": {
     onBeforeAddons(manager, param) {
       setAndLockPref("network.dns.disablePrefetch", !param);

browser/components/enterprisepolicies/schemas/policies-schema.json

@@ -403,6 +403,13 @@
       }
     },
 
+    "LocalFileLinks": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
+
     "NetworkPrediction": {
       "type": "boolean"
     },

browser/locales/en-US/browser/policies/policies-descriptions.ftl

@@ -97,6 +97,8 @@ policy-Homepage = Set and optionally lock the homepage.
 
 policy-InstallAddonsPermission = Allow certain websites to install add-ons.
 
+policy-LocalFileLinks = Allow specific websites to link to local files.
+
 policy-NetworkPrediction = Enable or disable network prediction (DNS prefetching).
 
 policy-NewTabPage = Enable or disable the New Tab page.