nfc: Add native NFC API definitions.

device/nfc/nfc_ndef_record.cc

+// Copyright (c) 2013 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 "device/nfc/nfc_ndef_record.h"
+
+#include <map>
+
+#include "base/logging.h"
+
+using base::DictionaryValue;
+using base::ListValue;
+
+namespace device {
+
+namespace {
+
+typedef std::map<std::string, base::Value::Type> FieldValueMap;
+
+bool CheckFieldsAreValid(
+    const FieldValueMap& required_fields,
+    const FieldValueMap& optional_fields,
+    const DictionaryValue* data) {
+  size_t required_count = 0;
+  for (DictionaryValue::Iterator iter(*data);
+       !iter.IsAtEnd(); iter.Advance()) {
+    FieldValueMap::const_iterator field_iter =
+        required_fields.find(iter.key());
+    if (field_iter == required_fields.end()) {
+      // Field wasn't one of the required fields. Check if optional.
+      field_iter = optional_fields.find(iter.key());
+
+      if (field_iter == optional_fields.end()) {
+        // If the field isn't one of the optional fields either, then it's
+        // invalid.
+        VLOG(1) << "Tried to populate record with invalid field: "
+                << iter.key();
+        return false;
+      }
+    } else {
+      required_count++;
+    }
+    // The field is invalid, if the type of its value is incorrect.
+    if (field_iter->second != iter.value().GetType()) {
+      VLOG(1) << "Provided value for field \"" << iter.key() << "\" has type "
+              << iter.value().GetType() << ", expected: "
+              << field_iter->second;
+      return false;
+    }
+  }
+  // Check for required fields.
+  if (required_count != required_fields.size()) {
+    VLOG(1) << "Provided data did not contain all required fields for "
+            << "requested NDEF type.";
+    return false;
+  }
+  return true;
+}
+
+// Verifies that the contents of |data| conform to the fields of NDEF type
+// "Text".
+bool HandleTypeText(const DictionaryValue* data) {
+  VLOG(1) << "Populating record with type \"Text\".";
+  FieldValueMap required_fields;
+  required_fields[NfcNdefRecord::kFieldText] = base::Value::TYPE_STRING;
+  FieldValueMap optional_fields;
+  optional_fields[NfcNdefRecord::kFieldEncoding] = base::Value::TYPE_STRING;
+  optional_fields[NfcNdefRecord::kFieldLanguageCode] = base::Value::TYPE_STRING;
+  if (!CheckFieldsAreValid(required_fields, optional_fields, data)) {
+    VLOG(1) << "Failed to populate record.";
+    return false;
+  }
+  return true;
+}
+
+// Verifies that the contents of |data| conform to the fields of NDEF type
+// "SmartPoster".
+bool HandleTypeSmartPoster(const DictionaryValue* data) {
+  VLOG(1) << "Populating record with type \"SmartPoster\".";
+  FieldValueMap required_fields;
+  required_fields[NfcNdefRecord::kFieldURI] = base::Value::TYPE_STRING;
+  FieldValueMap optional_fields;
+  optional_fields[NfcNdefRecord::kFieldAction] = base::Value::TYPE_STRING;
+  optional_fields[NfcNdefRecord::kFieldMimeType] = base::Value::TYPE_STRING;
+  // base::Value restricts the number types to BOOL, INTEGER, and DOUBLE only.
+  // uint32 will automatically get converted to a double. "target size" is
+  // really a uint32 but we define it as a double for this reason.
+  // (See dbus/values_util.h).
+  optional_fields[NfcNdefRecord::kFieldTargetSize] = base::Value::TYPE_DOUBLE;
+  optional_fields[NfcNdefRecord::kFieldTitles] = base::Value::TYPE_LIST;
+  if (!CheckFieldsAreValid(required_fields, optional_fields, data)) {
+    VLOG(1) << "Failed to populate record.";
+    return false;
+  }
+  // Verify that the "titles" field was formatted correctly, if it exists.
+  const ListValue* titles = NULL;
+  if (data->GetList(NfcNdefRecord::kFieldTitles, &titles)) {
+    if (titles->empty()) {
+      VLOG(1) << "\"titles\" field of SmartPoster is empty.";
+      return false;
+    }
+    for (ListValue::const_iterator iter = titles->begin();
+         iter != titles->end(); ++iter) {
+      const DictionaryValue* title_data = NULL;
+      if (!(*iter)->GetAsDictionary(&title_data)) {
+        VLOG(1) << "\"title\" entry for SmartPoster contains an invalid value "
+                << "type";
+        return false;
+      }
+      if (!HandleTypeText(title_data)) {
+        VLOG(1) << "Badly formatted \"title\" entry for SmartPoster.";
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+// Verifies that the contents of |data| conform to the fields of NDEF type
+// "URI".
+bool HandleTypeUri(const DictionaryValue* data) {
+  VLOG(1) << "Populating record with type \"URI\".";
+  FieldValueMap required_fields;
+  required_fields[NfcNdefRecord::kFieldURI] = base::Value::TYPE_STRING;
+  FieldValueMap optional_fields;
+  optional_fields[NfcNdefRecord::kFieldMimeType] = base::Value::TYPE_STRING;
+  optional_fields[NfcNdefRecord::kFieldTargetSize] = base::Value::TYPE_DOUBLE;
+  if (!CheckFieldsAreValid(required_fields, optional_fields, data)) {
+    VLOG(1) << "Failed to populate record.";
+    return false;
+  }
+  return true;
+}
+
+}  // namespace
+
+// static
+const char NfcNdefRecord::kFieldEncoding[] = "encoding";
+// static
+const char NfcNdefRecord::kFieldLanguageCode[] = "languageCode";
+// static
+const char NfcNdefRecord::kFieldText[] = "text";
+// static
+const char NfcNdefRecord::kFieldURI[] = "uri";
+// static
+const char NfcNdefRecord::kFieldMimeType[] = "mimeType";
+// static
+const char NfcNdefRecord::kFieldTargetSize[] = "targetSize";
+// static
+const char NfcNdefRecord::kFieldTitles[] = "titles";
+// static
+const char NfcNdefRecord::kFieldAction[] = "action";
+// static
+const char NfcNdefRecord::kEncodingUtf8[] = "UTF-8";
+// static
+const char NfcNdefRecord::kEncodingUtf16[] = "UTF-16";
+// static
+const char NfcNdefRecord::kSmartPosterActionDo[] = "do";
+// static
+const char NfcNdefRecord::kSmartPosterActionSave[] = "save";
+// static
+const char NfcNdefRecord::kSmartPosterActionOpen[] = "open";
+
+NfcNdefRecord::NfcNdefRecord() : type_(kTypeUnknown) {
+}
+
+NfcNdefRecord::~NfcNdefRecord() {
+}
+
+bool NfcNdefRecord::IsPopulated() const {
+  return type_ != kTypeUnknown;
+}
+
+bool NfcNdefRecord::Populate(Type type, const DictionaryValue* data) {
+  if (IsPopulated())
+    return false;
+
+  DCHECK(data_.empty());
+
+  // At this time, only "Text", "URI", and "SmartPoster" are supported.
+  bool result = false;
+  switch (type) {
+    case kTypeText:
+      result = HandleTypeText(data);
+      break;
+    case kTypeSmartPoster:
+      result = HandleTypeSmartPoster(data);
+      break;
+    case kTypeURI:
+      result = HandleTypeUri(data);
+      break;
+    default:
+      VLOG(1) << "Unsupported NDEF type: " << type;
+      break;
+  }
+  if (!result)
+    return false;
+  type_ = type;
+  data_.MergeDictionary(data);
+  return true;
+}
+
+NfcNdefMessage::NfcNdefMessage() {
+}
+
+NfcNdefMessage::~NfcNdefMessage() {
+}
+
+void NfcNdefMessage::AddRecord(NfcNdefRecord* record) {
+  records_.push_back(record);
+}
+
+}  // namespace device