[Payments] Refactor into PaymentRequestState and Spec

components/payments/content/payment_request_spec.cc

Index: components/payments/content/payment_request_spec.cc
diff --git a/components/payments/content/payment_request_spec.cc b/components/payments/content/payment_request_spec.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7509a76a1ccce6b77cc86bed05bff8cc6df22c1c
--- /dev/null
+++ b/components/payments/content/payment_request_spec.cc
@@ -0,0 +1,115 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/payments/content/payment_request_spec.h"
+
+#include <utility>
+
+#include "base/logging.h"
+
+namespace payments {
+
+namespace {
+// Identifier for the basic card payment method in the PaymentMethodData.
+static const char* const kBasicCardMethodName = "basic-card";
+}  // namespace
+
+PaymentRequestSpec::PaymentRequestSpec(
+    mojom::PaymentOptionsPtr options,
+    mojom::PaymentDetailsPtr details,
+    std::vector<mojom::PaymentMethodDataPtr> method_data,
+    Observer* observer)
+    : options_(std::move(options)), details_(std::move(details)) {
+  if (observer)
+    AddObserver(observer);
+  PopulateValidatedMethodData(method_data);
+}
+PaymentRequestSpec::~PaymentRequestSpec() {}
+
+void PaymentRequestSpec::AddObserver(Observer* observer) {
+  CHECK(observer);
+  observers_.AddObserver(observer);
+}
+
+void PaymentRequestSpec::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void PaymentRequestSpec::PopulateValidatedMethodData(
+    const std::vector<mojom::PaymentMethodDataPtr>& method_data) {
+  if (method_data.empty()) {
+    LOG(ERROR) << "Invalid payment methods or data";
+    NotifyOnInvalidSpecProvided();
+    return;
+  }
+
+  std::set<std::string> card_networks{"amex",     "diners",     "discover",
+                                      "jcb",      "mastercard", "mir",
+                                      "unionpay", "visa"};
+  for (const mojom::PaymentMethodDataPtr& method_data_entry : method_data) {
+    std::vector<std::string> supported_methods =
+        method_data_entry->supported_methods;
+    if (supported_methods.empty()) {
+      LOG(ERROR) << "Invalid payment methods or data";
+      NotifyOnInvalidSpecProvided();
+      return;
+    }
+
+    for (const std::string& method : supported_methods) {
+      if (method.empty())
+        continue;
+
+      // If a card network is specified right in "supportedMethods", add it.
+      auto card_it = card_networks.find(method);
+      if (card_it != card_networks.end()) {
+        supported_card_networks_.push_back(method);
+        // |method| removed from |card_networks| so that it is not doubly added
+        // to |supported_card_networks_| if "basic-card" is specified with no
+        // supported networks.
+        card_networks.erase(card_it);
+      } else if (method == kBasicCardMethodName) {
+        // For the "basic-card" method, check "supportedNetworks".
+        if (method_data_entry->supported_networks.empty()) {
+          // Empty |supported_networks| means all networks are supported.
+          supported_card_networks_.insert(supported_card_networks_.end(),
+                                          card_networks.begin(),
+                                          card_networks.end());
+          // Clear the set so that no further networks are added to
+          // |supported_card_networks_|.
+          card_networks.clear();
+        } else {
+          // The merchant has specified a few basic card supported networks. Use
+          // the mapping to transform to known basic-card types.
+          using mojom::BasicCardNetwork;
+          std::unordered_map<BasicCardNetwork, std::string> networks = {
+              {BasicCardNetwork::AMEX, "amex"},
+              {BasicCardNetwork::DINERS, "diners"},
+              {BasicCardNetwork::DISCOVER, "discover"},
+              {BasicCardNetwork::JCB, "jcb"},
+              {BasicCardNetwork::MASTERCARD, "mastercard"},
+              {BasicCardNetwork::MIR, "mir"},
+              {BasicCardNetwork::UNIONPAY, "unionpay"},
+              {BasicCardNetwork::VISA, "visa"}};
+          for (const BasicCardNetwork& supported_network :
+               method_data_entry->supported_networks) {
+            // Make sure that the network was not already added to
+            // |supported_card_networks_|.
+            auto card_it = card_networks.find(networks[supported_network]);
+            if (card_it != card_networks.end()) {
+              supported_card_networks_.push_back(networks[supported_network]);
+              card_networks.erase(card_it);
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
+void PaymentRequestSpec::NotifyOnInvalidSpecProvided() {
+  for (auto& observer : observers_)
+    observer.OnInvalidSpecProvided();
+}
+
+}  // namespace payments