Bug 1190586 - UITour should expose if default browser can be set w/o UI on Win8+. r=dolske

browser/components/uitour/UITour.jsm

@@ -8,6 +8,7 @@ this.EXPORTED_SYMBOLS = ["UITour", "UITourMetricsProvider"];
 
 const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
 
+Cu.import("resource://gre/modules/AppConstants.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Promise.jsm");
@@ -1805,6 +1806,27 @@ this.UITour = {
           }
         } catch (e) {}
         appinfo["defaultBrowser"] = isDefaultBrowser;
+
+        let canSetDefaultBrowserInBackground = true;
+        if (AppConstants.isPlatformAndVersionAtLeast("win", "6.2")) {
+          let prefBranch =
+            Services.prefs.getBranch("browser.shell.associationHash");
+          let prefChildren = prefBranch.getChildList("");
+          canSetDefaultBrowserInBackground = prefChildren.length > 0;
+        } else if (AppConstants.isPlatformAndVersionAtLeast("macosx", "10.10")) {
+          canSetDefaultBrowserInBackground = false;
+        } else if (AppConstants.platform == "linux") {
+          // The ShellService may not exist on some versions of Linux.
+          try {
+            let shell = aWindow.getShellService();
+          } catch (e) {
+            canSetDefaultBrowserInBackground = null;
+          }
+        }
+
+        appinfo["canSetDefaultBrowserInBackground"] =
+          canSetDefaultBrowserInBackground;
+
         this.sendPageCallback(aMessageManager, aCallbackID, appinfo);
         break;
       case "availableTargets":

browser/components/uitour/test/browser_UITour_defaultBrowser.js

@@ -61,7 +61,34 @@ let tests = [
                           .getService(Components.interfaces.nsIShellService);
     let isDefault = shell.isDefaultBrowser(false);
     gContentAPI.getConfiguration("appinfo", (data) => {
-      is(data.value, data.defaultBrowser, "gContentAPI result should match shellService.isDefaultBrowser");
+      is(isDefault, data.defaultBrowser, "gContentAPI result should match shellService.isDefaultBrowser");
+      done();
+    });
+  }),
+
+  taskify(function* test_setInBackgroundWhenPrefExists(done) {
+    Services.prefs.setCharPref("browser.shell.associationHash.http", "ABCDEFG");
+    gContentAPI.getConfiguration("appinfo", (data) => {
+      let canSetInBackground = true;
+      is(canSetInBackground, data.canSetDefaultBrowserInBackground,
+        "canSetDefaultBrowserInBackground should be true when a hash is present");
+      Services.prefs.clearUserPref("browser.shell.associationHash.http");
+      done();
+    });
+  }),
+
+  taskify(function* test_setInBackgroundWhenPrefDoesntExist(done) {
+    /* The association hashes are only supported on Windows. */
+    Cu.import("resource://gre/modules/AppConstants.jsm");
+    if (AppConstants.platform != "win") {
+      info("Skipping test_setInBackgroundWhenPrefDoesntExist on non-Windows platform");
+      return;
+    }
+
+    gContentAPI.getConfiguration("appinfo", (data) => {
+      let canSetInBackground = false;
+      is(canSetInBackground, data.canSetDefaultBrowserInBackground,
+        "canSetDefaultBrowserInBackground should be false when no hashes are present");
       done();
     });
   })