Add optional method to sanitize search input

Author: rachelmcr

WooCommerce/Classes/ViewRelated/Search/SearchUICommand.swift

@@ -84,13 +84,24 @@ protocol SearchUICommand {
 
     /// The Accessibility Identifier for the cancel button
     var cancelButtonAccessibilityIdentifier: String { get }
+
+    /// Optionally sanitizes the search keyword.
+    ///
+    /// - Parameter keyword: user-entered search keyword.
+    /// - Returns: sanitized search keyword.
+    func sanitizeKeyword(_ keyword: String) -> String
 }
 
 // MARK: - Default implementation
 extension SearchUICommand {
     func configureActionButton(_ button: UIButton, onDismiss: @escaping () -> Void) {
         // If not implemented, keeps the default cancel UI/UX
     }
+
+    func sanitizeKeyword(_ keyword: String) -> String {
+        // If not implemented, returns the keyword as entered
+        return keyword
+    }
 }
 
 // MARK: - SearchUICommand using EmptySearchResultsViewController

WooCommerce/Classes/ViewRelated/Search/SearchViewController.swift

@@ -70,7 +70,7 @@ where Cell.SearchModel == Command.CellViewModel {
     /// Returns the active Keyword
     ///
     private var keyword: String {
-        return searchBar.text ?? String()
+        return searchUICommand.sanitizeKeyword(searchBar.text ?? String())
     }
 
     /// UI Active State
@@ -205,7 +205,8 @@ where Cell.SearchModel == Command.CellViewModel {
     // MARK: - UISearchBarDelegate Conformance
     //
     func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
-        synchronizeSearchResults(with: searchText)
+        let sanitizedSearchText = searchUICommand.sanitizeKeyword(searchText)
+        synchronizeSearchResults(with: sanitizedSearchText)
     }
 
     func searchBarShouldBeginEditing(_ searchBar: UISearchBar) -> Bool {