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The Microsoft Azure IoT Device SDK for Java
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
package com.microsoft.azure.sdk.iot.device.twin;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;
import java.nio.charset.StandardCharsets;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TimeZone;
/**
* Set of static functions to help the serializer.
*/
// Unchecked casts of Maps to Map are safe as long as service is returning valid twin json payloads. Since all json keys are Strings, all maps must be Map
@SuppressWarnings("unchecked")
public class ParserUtility
{
private static final String DATEFORMAT = "yyyy-MM-dd'T'HH:mm:ss";
private static final String OFFSETFORMAT = "yyyy-MM-dd'T'HH:mm:ssXXX";
final static DateTimeFormatter UTC_DATETIME_FORMATTER = DateTimeFormatter.ofPattern(DATEFORMAT);
private static final String TIMEZONE_UTC = "UTC";
private static final String SELECT = "select";
private static final String FROM = "from";
private static final int NO_MILLISECONDS_IN_DATE = 0;
private static final int DATE_AND_TIME_IN_DATE = 0;
private static final int MILLISECONDS_IN_DATE = 1;
private static final int EXPECTED_PARTS_IN_DATE = 2;
private static final int MAX_MILLISECONDS_LENGTH_IN_DATE = 3;
private static final double MILLISECONDS_NUMERIC_BASE = 10;
private static final String MILLISECONDS_REGEX = "[.,Z]";
/**
* Helper to validate if the provided string is not null, empty, and all characters are UTF-8.
*
* @param str is the string to be validated.
* @throws IllegalArgumentException if the string do not fit the criteria.
*/
public static void validateStringUTF8(String str) throws IllegalArgumentException
{
if ((str == null) || str.isEmpty())
{
throw new IllegalArgumentException("parameter is null or empty");
}
if (str.getBytes(StandardCharsets.UTF_8).length != str.length())
{
throw new IllegalArgumentException("parameter contains non UTF-8 character");
}
}
/**
*
* Validates if query contains select and from keywords and also if it is a valid utf-8 string
* @param query query to be validated
* @throws IllegalArgumentException if query does not contain "select" or "from" or is not a valid utf-8 string
*/
public static void validateQuery(String query) throws IllegalArgumentException
{
try
{
validateStringUTF8(query);
}
catch (IllegalArgumentException e)
{
throw new IllegalArgumentException("The provided query is not valid");
}
if (!query.toLowerCase().contains(SELECT) || !query.toLowerCase().contains(FROM))
{
throw new IllegalArgumentException("Query must contain select and from");
}
}
/**
* Helper to validate if the provided blob name is not null, empty, and valid.
*
* @param blobName is the blob name to be validated.
* @throws IllegalArgumentException if the blob name do not fit the criteria.
*/
public static void validateBlobName(String blobName) throws IllegalArgumentException
{
try
{
validateStringUTF8(blobName);
}
catch (IllegalArgumentException e)
{
throw new IllegalArgumentException("The provided blob name is not valid");
}
if (blobName.length() > 1024)
{
throw new IllegalArgumentException("The provided blob name exceed maximum size of 1024 characters");
}
if (blobName.split("/").length > 254)
{
throw new IllegalArgumentException("The provided blob name exceed 254 path segments");
}
}
/**
* Helper to validate if the provided object is not null.
*
* @param val is the object to be validated.
* @throws IllegalArgumentException if the object do not fit the criteria.
*/
public static void validateObject(Object val) throws IllegalArgumentException
{
if (val == null)
{
throw new IllegalArgumentException("parameter is null");
}
}
/**
* Helper to validate if the provided map in terms of maximum
* levels and optionally if the keys ar not metadata.
*
* @param map the {@code Map} to be validate. It can be {@code null}, and it will succeed in this case.
* @throws IllegalArgumentException If the Map contains more than maxLevel levels or do not allow metadata
* but contains metadata key.
*/
public static void validateMap(Map map) throws IllegalArgumentException
{
if (map != null)
{
validateMapInternal(map);
}
}
private static void validateMapInternal(Map map) throws IllegalArgumentException
{
for (Map.Entry entry : map.entrySet())
{
Object value = entry.getValue();
if ((value != null) && ((value.getClass().isArray()) || (value.getClass().isLocalClass())))
{
throw new IllegalArgumentException("Map contains illegal value type " + value.getClass().getName());
}
if (value instanceof Map)
{
validateMapInternal((Map) value);
}
}
}
/**
* Helper to convert the provided string in a UTC Date.
* Expected format:
* "2016-06-01T21:22:43.7996883Z"
*
* @param dataTime is the string with the date and time
* @return Date parsed from the string
* @throws IllegalArgumentException if the date and time in the string is not in the correct format.
*/
public static Date getDateTimeUtc(String dataTime) throws IllegalArgumentException
{
Date dateTimeUtc;
SimpleDateFormat dateFormat = new SimpleDateFormat(DATEFORMAT);
dateFormat.setTimeZone(TimeZone.getTimeZone(TIMEZONE_UTC));
/* Codes_SRS_PARSER_UTILITY_21_022: [If the provide string is null, empty or contains an invalid data format, the getDateTimeUtc shall throw IllegalArgumentException.] */
if ((dataTime == null) || dataTime.isEmpty())
{
throw new IllegalArgumentException("date is null, empty, or invalid");
}
try
{
String[] splitDateTime = dataTime.split(MILLISECONDS_REGEX);
int milliseconds;
if (splitDateTime.length > EXPECTED_PARTS_IN_DATE)
{
throw new IllegalArgumentException("invalid time:" + dataTime);
}
else if ((splitDateTime.length == EXPECTED_PARTS_IN_DATE) && !splitDateTime[MILLISECONDS_IN_DATE].isEmpty())
{
int millisecondsLength = splitDateTime[MILLISECONDS_IN_DATE].length();
if (millisecondsLength > MAX_MILLISECONDS_LENGTH_IN_DATE)
{
millisecondsLength = MAX_MILLISECONDS_LENGTH_IN_DATE;
}
milliseconds = Integer.parseInt(splitDateTime[MILLISECONDS_IN_DATE].substring(0, millisecondsLength)) *
(int)Math.pow(MILLISECONDS_NUMERIC_BASE, (MAX_MILLISECONDS_LENGTH_IN_DATE - millisecondsLength));
}
else
{
milliseconds = NO_MILLISECONDS_IN_DATE;
}
dateTimeUtc = new Date(dateFormat.parse(splitDateTime[DATE_AND_TIME_IN_DATE]).getTime() + milliseconds);
}
catch (ParseException e)
{
throw new IllegalArgumentException("invalid time:" + dataTime);
}
return dateTimeUtc;
}
/**
* Helper to convert the provided string in a offset Date.
* Expected format:
* "2016-06-01T21:22:41+00:00"
*
* @param dateTime is the string with the date and time
* @return Date parsed from the string
* @throws IllegalArgumentException if the date and time in the string is not in the correct format.
*/
public static Date stringToDateTimeOffset(String dateTime) throws IllegalArgumentException
{
Date dateTimeOffset;
SimpleDateFormat dateFormat = new SimpleDateFormat(OFFSETFORMAT);
dateFormat.setTimeZone(TimeZone.getTimeZone(TIMEZONE_UTC));
if ((dateTime == null) || dateTime.isEmpty())
{
throw new IllegalArgumentException("date is null or empty");
}
try
{
dateTimeOffset = dateFormat.parse(dateTime);
}
catch (ParseException e)
{
throw new IllegalArgumentException("invalid time:" + e.toString());
}
return dateTimeOffset;
}
/**
* Helper to convert the provided Date UTC into String.
* Expected result:
* "2016-06-01T21:22:43.799Z"
*
* @param date is the {@code Date} with the date and time
* @return the {@code String} with the date and time using the UTC format.
* @throws IllegalArgumentException if the provided date is {@code null}.
*/
public static String dateTimeUtcToString(Date date) throws IllegalArgumentException
{
if (date == null)
{
throw new IllegalArgumentException("date cannot be null");
}
SimpleDateFormat dateFormat = new SimpleDateFormat(DATEFORMAT);
dateFormat.setTimeZone(TimeZone.getTimeZone(TIMEZONE_UTC));
StringBuilder dateStr = new StringBuilder();
dateStr.append(dateFormat.format(date));
dateStr.append(".");
int milliseconds = (int)(date.getTime() % 1000L);
milliseconds = milliseconds < 0 ? milliseconds + 1000 : milliseconds;
dateStr.append(milliseconds);
dateStr.append("Z");
return dateStr.toString();
}
/**
* Convert from a date object back into a string representation
* Expected format of returned string:
* "2016-01-21T11:05:21"
*
* @param date the date to convert into a string
* @throws IllegalArgumentException if the provided date is null
* @return the date represented as a string
*/
public static String getUTCDateStringFromDate(Date date) throws IllegalArgumentException
{
if (date == null)
{
throw new IllegalArgumentException("The provided date cannot be null");
}
OffsetDateTime offsetDateTime = date.toInstant().atOffset(ZoneOffset.UTC);
return offsetDateTime.format(UTC_DATETIME_FORMATTER);
}
/**
* Helper to convert a provided map in to a JsonElement, including sub-maps.
*
* @param map is the map to serialize
* @return a JsonElement that represents the content of the map.
* @throws IllegalArgumentException if the provided map is null.
*/
public static JsonElement mapToJsonElement(Map map) throws IllegalArgumentException
{
Gson gson = new GsonBuilder().serializeNulls().create();
JsonObject json = new JsonObject();
if (map == null)
{
throw new IllegalArgumentException("null map to parse");
}
for (Map.Entry entry : map.entrySet())
{
if (entry.getValue() == null)
{
json.addProperty(entry.getKey(), (String)null);
}
else if (entry.getValue() instanceof Map)
{
json.add(entry.getKey(), mapToJsonElement((Map) entry.getValue()));
}
else
{
json.add(entry.getKey(), gson.toJsonTree(entry.getValue()));
}
}
return json;
}
public static Object resolveJsonElement(JsonElement jsonElement)
{
if (jsonElement == null || jsonElement.isJsonNull())
{
return null;
}
else if (jsonElement.isJsonPrimitive())
{
return getJsonPrimitiveValue(jsonElement.getAsJsonPrimitive());
}
else if (jsonElement.isJsonObject())
{
return getJsonObjectValue(jsonElement.getAsJsonObject());
}
else if (jsonElement.isJsonArray())
{
return getJsonArrayValue(jsonElement.getAsJsonArray());
}
else
{
// shouldn't be here
throw new IllegalArgumentException("Invalid DeviceMethodResponse payload: unknown payload type: " + jsonElement.getClass());
}
}
private static Object getJsonPrimitiveValue(JsonPrimitive jsonPrimitive)
{
if (jsonPrimitive.isNumber())
{
return jsonPrimitive.getAsNumber();
}
else if (jsonPrimitive.isBoolean())
{
return jsonPrimitive.getAsBoolean();
}
else
{
return jsonPrimitive.getAsString();
}
}
public static Map getJsonObjectValue(JsonObject jsonObject)
{
Map map = new HashMap<>();
for (Map.Entry entry : jsonObject.entrySet())
{
map.put(entry.getKey(), resolveJsonElement(entry.getValue()));
}
return map;
}
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