Download web payment manifests.

components/payments/content/android/utility/payment_manifest_parser.cc

+// Copyright 2017 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/android/utility/payment_manifest_parser.h"
+
+#include <stddef.h>
+
+#include <memory>
+#include <utility>
+
+#include "base/json/json_reader.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_util.h"
+#include "base/values.h"
+#include "components/payments/content/android/utility/fingerprint_parser.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace payments {
+
+// static
+void PaymentManifestParser::Create(
+    mojom::PaymentManifestParserRequest request) {
+  mojo::MakeStrongBinding(base::MakeUnique<PaymentManifestParser>(),
+                          std::move(request));
+}
+
+// static
+std::vector<mojom::PaymentManifestSectionPtr>
+PaymentManifestParser::ParseIntoVector(const std::string& input) {
+  std::vector<mojom::PaymentManifestSectionPtr> output;
+  std::unique_ptr<base::Value> value(base::JSONReader::Read(input));
+  if (!value)
+    return output;
+
+  std::unique_ptr<base::DictionaryValue> dict =
+      base::DictionaryValue::From(std::move(value));
+  if (!dict)
+    return output;
+
+  base::ListValue* list = nullptr;
+  if (!dict->GetList("android", &list) || !list)
+    return output;
+
+  size_t sections_size = list->GetSize();
+  const size_t kMaximumNumberOfSections = 100U;
+  if (sections_size > kMaximumNumberOfSections)
+    return output;
+
+  const char* const kVersion = "version";
+  const char* const kFingerprints = "sha256_cert_fingerprints";
+  for (size_t i = 0; i < sections_size; ++i) {
+    base::DictionaryValue* item = nullptr;
+    if (!list->GetDictionary(i, &item) || !item) {
+      output.clear();
+      return output;
+    }
+
+    mojom::PaymentManifestSectionPtr section =
+        mojom::PaymentManifestSection::New();
+    section->version = 0;
+
+    if (!item->GetString("package", &section->package_name) ||
+        section->package_name.empty() ||
+        !base::IsStringASCII(section->package_name)) {
+      output.clear();
+      return output;
+    }
+
+    if (section->package_name == "*") {
+      output.clear();
+      // If there's a section with "package": "*", then it must be the only
+      // section and it should not have "version" or "sha256_cert_fingerprints".
+      // (Any deviations from a correct format cause the full file to be
+      // rejected.)
+      if (!item->HasKey(kVersion) && !item->HasKey(kFingerprints) &&
+          sections_size == 1U) {
+        output.push_back(std::move(section));
+      }
+      return output;
+    }
+
+    if (!item->HasKey(kVersion) || !item->HasKey(kFingerprints)) {
+      output.clear();
+      return output;
+    }
+
+    int version = 0;
+    if (!item->GetInteger(kVersion, &version)) {
+      output.clear();
+      return output;
+    }
+
+    section->version = static_cast<int64_t>(version);
+
+    base::ListValue* fingerprints = nullptr;
+    if (!item->GetList(kFingerprints, &fingerprints) || !fingerprints ||
+        fingerprints->empty()) {
+      output.clear();
+      return output;
+    }
+
+    size_t fingerprints_size = fingerprints->GetSize();
+    const size_t kMaximumNumberOfFingerprints = 100U;
+    if (fingerprints_size > kMaximumNumberOfFingerprints) {
+      output.clear();
+      return output;
+    }
+
+    for (size_t j = 0; j < fingerprints_size; ++j) {
+      std::string fingerprint;
+      if (!fingerprints->GetString(j, &fingerprint) || fingerprint.empty()) {
+        output.clear();
+        return output;
+      }
+
+      std::vector<uint8_t> fingerprint_bytes =
+          FingerprintStringToByteArray(fingerprint);
+      if (32U != fingerprint_bytes.size()) {
+        output.clear();
+        return output;
+      }
+
+      section->sha256_cert_fingerprints.push_back(fingerprint_bytes);
+    }
+
+    output.push_back(std::move(section));
+  }
+
+  return output;
+}
+
+PaymentManifestParser::PaymentManifestParser() {}
+
+PaymentManifestParser::~PaymentManifestParser() {}
+
+void PaymentManifestParser::Parse(const std::string& content,
+                                  const ParseCallback& callback) {
+  callback.Run(ParseIntoVector(content));
+}
+
+}  // namespace payments