Bug 1463680 - Allow to install search engine with POST method via Policy Engine r=Felipe

Differential Revision: https://phabricator.services.mozilla.com/D19467

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

browser/components/enterprisepolicies/Policies.jsm

@@ -856,6 +856,7 @@ var Policies = {
                 alias:       newEngine.Alias,
                 description: newEngine.Description,
                 method:      newEngine.Method,
+                postData:    newEngine.PostData,
                 suggestURL:  newEngine.SuggestURLTemplate,
                 extensionID: "set-via-policy",
                 queryCharset: "UTF-8",

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

@@ -638,6 +638,9 @@
               "URLTemplate": {
                 "type": "string"
               },
+              "PostData": {
+                "type": "string"
+              },
               "SuggestURLTemplate": {
                 "type": "string"
               }

browser/components/enterprisepolicies/tests/browser/browser_policy_search_engine.js

@@ -245,3 +245,48 @@ add_task(async function test_install_and_remove() {
 
   EnterprisePolicyTesting.resetRunOnceState();
 });
+
+add_task(async function test_install_post_method_engine() {
+  is(Services.search.getEngineByName("Post"), null,
+     "Engine \"Post\" should not be present when test starts");
+
+  await setupPolicyEngineWithJson({
+  "policies": {
+      "SearchEngines": {
+        "Add": [
+          {
+            "Name": "Post",
+            "Method": "POST",
+            "PostData": "q={searchTerms}&anotherParam=yes",
+            "URLTemplate": "http://example.com/",
+          },
+        ],
+      },
+    },
+  });
+  // Get in line, because the Search policy callbacks are async.
+  await TestUtils.waitForTick();
+
+  let engine = Services.search.getEngineByName("Post");
+  isnot(engine, null, "Specified search engine should be installed");
+
+  is(engine.wrappedJSObject._urls[0].method, "POST", "Method should be POST");
+
+  let submission = engine.getSubmission("term", "text/html");
+  isnot(submission.postData, null, "Post data should not be null");
+
+  let scriptableInputStream = Cc["@mozilla.org/scriptableinputstream;1"].createInstance(Ci.nsIScriptableInputStream);
+  scriptableInputStream.init(submission.postData);
+  is(scriptableInputStream.read(scriptableInputStream.available()),
+     "q=term&anotherParam=yes",
+     "Post data should be present");
+
+  await setupPolicyEngineWithJson({
+  "policies": {
+      "SearchEngines": {
+        "Remove": ["Post"],
+      },
+    },
+  });
+  EnterprisePolicyTesting.resetRunOnceState();
+});