[Autofill] Autofill fails to show suggestions for credit card split across fields.

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index 48cd5974c206b50c064630dace3cb85731b24497..ab53e3b3b70aa87443fa2116948d7b720a7e32ab 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -156,6 +156,22 @@ void DeterminePossibleFieldTypesForUpload(
   }
 }
 
+// Helper function to obfuscate the credit card digits with '*'.
+base::string16 ObfuscatedCreditCardNumber(const base::string16& card_number) {
+  // If the number is shorter than four digits, there's no need to obfuscate it.
+  if (card_number.size() < 4)
+    return card_number;
+
+  const size_t max_obfuscation_size = 20;
+  const base::char16 obfuscation_symbol = '*';
+
+  // Avoid making very long obfuscated numbers.
+  size_t obfuscated_digits =
+      std::min(max_obfuscation_size, card_number.size() - 4);
+  base::string16 result(obfuscated_digits, obfuscation_symbol);
+  return result.append(card_number.substr(card_number.size() - 4));
+}

[Ilya Sherman, 2014/10/16 23:55:10]

Please remove this function.  This work should be done by the
PersonalDataManager.

[Pritam Nikam, 2014/10/28 10:11:07]

Done.

+
 }  // namespace
 
 AutofillManager::AutofillManager(
@@ -473,7 +489,7 @@ void AutofillManager::OnQueryFormFieldAutofill(int query_id,
     bool is_filling_credit_card = (type.group() == CREDIT_CARD);
     if (is_filling_credit_card) {
       GetCreditCardSuggestions(
-          field, type, &values, &labels, &icons, &unique_ids);
+          field, *autofill_field, &values, &labels, &icons, &unique_ids);
     } else {
       GetProfileSuggestions(*form_structure,
                             field,
@@ -1104,8 +1120,8 @@ void AutofillManager::GetProfileSuggestions(
   // Adjust phone number to display in prefix/suffix case.
   if (autofill_field.Type().GetStorableType() == PHONE_HOME_NUMBER) {
     for (size_t i = 0; i < values->size(); ++i) {
-      (*values)[i] = AutofillField::GetPhoneNumberValue(
-          autofill_field, (*values)[i], field);
+      (*values)[i] =
+          AutofillField::GetPhoneNumberValue(autofill_field, (*values)[i]);
     }
   }
 
@@ -1117,14 +1133,40 @@ void AutofillManager::GetProfileSuggestions(
 
 void AutofillManager::GetCreditCardSuggestions(
     const FormFieldData& field,
-    const AutofillType& type,
+    const AutofillField& autofill_field,
     std::vector<base::string16>* values,
     std::vector<base::string16>* labels,
     std::vector<base::string16>* icons,
     std::vector<int>* unique_ids) const {
   std::vector<GUIDPair> guid_pairs;
+  AutofillType type = autofill_field.Type();
   personal_data_->GetCreditCardSuggestions(
-      type, field.value, values, labels, icons, &guid_pairs);
+      type, field.value, values, labels, icons, &guid_pairs, false);
+
+  // Remove the non-matching credit card suggestions.
+  if (type.GetStorableType() == CREDIT_CARD_NUMBER) {
+    std::vector<base::string16>::iterator it = values->begin();
+    while (it != values->end()) {
+      base::string16 card_number =
+          AutofillField::GetCreditCardNumberValue(autofill_field, *it);
+      if (StartsWith(card_number, field.value, false)) {
+        ++it;
+        continue;
+      }
+
+      // Prune the not-matching suggestions.
+      size_t offset = it - values->begin();
+      it = values->erase(it);
+      labels->erase(offset + labels->begin());
+      icons->erase(offset + icons->begin());
+      guid_pairs.erase(offset + guid_pairs.begin());
+    }
+
+    // Obfuscate the credit card numbers in suggetions.
+    for (size_t i = 0; i < values->size(); ++i) {
+      (*values)[i] = ObfuscatedCreditCardNumber((*values)[i]);
+    }
+  }
 
   for (size_t i = 0; i < guid_pairs.size(); ++i) {
     unique_ids->push_back(PackGUIDs(guid_pairs[i], GUIDPair(std::string(), 0)));