email -> id: Make browser's filter for "sender" more robust.

frontend_tests/node_tests/filter.js

@@ -21,7 +21,21 @@ var me = {
     full_name: 'Me Myself',
 };
 
+var joe = {
+    email: 'joe@example.com',
+    user_id: 31,
+    full_name: 'joe',
+};
+
+var steve = {
+    email: 'STEVE@foo.com',
+    user_id: 32,
+    full_name: 'steve',
+};
+
 people.add(me);
+people.add(joe);
+people.add(steve);
 people.initialize_current_user(me.user_id);
 
 function assert_same_operators(result, terms) {
@@ -259,8 +273,8 @@ function get_predicate(operators) {
     assert(!predicate({type: 'stream', id: 5, subject: 'dinner'}));
 
     predicate = get_predicate([['sender', 'Joe@example.com']]);
-    assert(predicate({sender_email: 'JOE@example.com'}));
-    assert(!predicate({sender_email: 'steve@foo.com'}));
+    assert(predicate({sender_id: joe.user_id}));
+    assert(!predicate({sender_email: steve.user_id}));
 
     predicate = get_predicate([['pm-with', 'Joe@example.com']]);
     assert(predicate({type: 'private', reply_to: 'JOE@example.com'}));

static/js/filter.js

@@ -97,7 +97,7 @@ function message_matches_search_term(message, operator, operand) {
 
 
     case 'sender':
-        return (message.sender_email.toLowerCase() === operand.toLowerCase());
+        return people.id_matches_email_operand(message.sender_id, operand);
 
     case 'pm-with':
         // TODO: use user_ids, not emails here

static/js/people.js

@@ -54,6 +54,19 @@ exports.get_by_email = function (email) {
     return person;
 };
 
+exports.id_matches_email_operand = function (user_id, email) {
+    var person = exports.get_by_email(email);
+
+    if (!person) {
+        // The user may type bad data into the search bar, so
+        // we don't complain too loud here.
+        blueslip.debug('User email operand unknown: ' + email);
+        return false;
+    }
+
+    return (person.user_id === user_id);
+};
+
 exports.update_email = function (user_id, new_email) {
     var person = people_by_user_id_dict.get(user_id);
     person.email = new_email;