com.github.messenger4j.webhook.factory.AttachmentMessageEventFactory Maven / Gradle / Ivy

package com.github.messenger4j.webhook.factory;

import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_ATTACHMENTS;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_COORDINATES;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_ID;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_IS_ECHO;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_LAT;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_LONG;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_MESSAGE;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_MID;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_PAYLOAD;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_PRIOR_MESSAGE;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_RECIPIENT;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_SENDER;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_TIMESTAMP;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_TYPE;
import static com.github.messenger4j.internal.gson.GsonUtil.Constants.PROP_URL;
import static com.github.messenger4j.internal.gson.GsonUtil.getPropertyAsDouble;
import static com.github.messenger4j.internal.gson.GsonUtil.getPropertyAsInstant;
import static com.github.messenger4j.internal.gson.GsonUtil.getPropertyAsJsonArray;
import static com.github.messenger4j.internal.gson.GsonUtil.getPropertyAsJsonObject;
import static com.github.messenger4j.internal.gson.GsonUtil.getPropertyAsString;
import static com.github.messenger4j.internal.gson.GsonUtil.hasProperty;

import com.github.messenger4j.webhook.event.AttachmentMessageEvent;
import com.github.messenger4j.webhook.event.attachment.Attachment;
import com.github.messenger4j.webhook.event.attachment.FallbackAttachment;
import com.github.messenger4j.webhook.event.attachment.LocationAttachment;
import com.github.messenger4j.webhook.event.attachment.RichMediaAttachment;
import com.github.messenger4j.webhook.event.attachment.RichMediaAttachment.Type;
import com.github.messenger4j.webhook.event.common.PriorMessage;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import java.net.MalformedURLException;
import java.net.URL;
import java.time.Instant;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

/**
 * @author Max Grabenhorst
 * @since 1.0.0
 */
final class AttachmentMessageEventFactory implements BaseEventFactory {

  @Override
  public boolean isResponsible(JsonObject messagingEvent) {
    return hasProperty(messagingEvent, PROP_MESSAGE, PROP_ATTACHMENTS)
        && !hasProperty(messagingEvent, PROP_MESSAGE, PROP_IS_ECHO);
  }

  @Override
  public AttachmentMessageEvent createEventFromJson(JsonObject messagingEvent) {
    final String senderId =
        getPropertyAsString(messagingEvent, PROP_SENDER, PROP_ID)
            .orElseThrow(IllegalArgumentException::new);
    final String recipientId =
        getPropertyAsString(messagingEvent, PROP_RECIPIENT, PROP_ID)
            .orElseThrow(IllegalArgumentException::new);
    final Instant timestamp =
        getPropertyAsInstant(messagingEvent, PROP_TIMESTAMP)
            .orElseThrow(IllegalArgumentException::new);
    final String messageId =
        getPropertyAsString(messagingEvent, PROP_MESSAGE, PROP_MID)
            .orElseThrow(IllegalArgumentException::new);
    final JsonArray attachmentsJsonArray =
        getPropertyAsJsonArray(messagingEvent, PROP_MESSAGE, PROP_ATTACHMENTS)
            .orElseThrow(IllegalArgumentException::new);
    final List attachments = getAttachmentsFromJsonArray(attachmentsJsonArray);
    final Optional priorMessage =
        getPropertyAsJsonObject(messagingEvent, PROP_PRIOR_MESSAGE)
            .map(this::getPriorMessageFromJsonObject);

    return new AttachmentMessageEvent(
        senderId, recipientId, timestamp, messageId, attachments, priorMessage);
  }

  private List getAttachmentsFromJsonArray(JsonArray attachmentsJsonArray) {
    final List attachments = new ArrayList<>(attachmentsJsonArray.size());
    for (JsonElement attachmentJsonElement : attachmentsJsonArray) {
      final JsonObject attachmentJsonObject = attachmentJsonElement.getAsJsonObject();
      final String type =
          getPropertyAsString(attachmentJsonObject, PROP_TYPE)
              .map(String::toUpperCase)
              .orElseThrow(IllegalArgumentException::new);
      switch (type) {
        case "IMAGE":
        case "AUDIO":
        case "VIDEO":
        case "FILE":
          final URL url =
              getPropertyAsString(attachmentJsonObject, PROP_PAYLOAD, PROP_URL)
                  .map(this::getUrlFromString)
                  .orElseThrow(IllegalArgumentException::new);
          attachments.add(new RichMediaAttachment(Type.valueOf(type), url));
          break;
        case "LOCATION":
          final Double latitude =
              getPropertyAsDouble(attachmentJsonObject, PROP_PAYLOAD, PROP_COORDINATES, PROP_LAT)
                  .orElseThrow(IllegalArgumentException::new);
          final Double longitude =
              getPropertyAsDouble(attachmentJsonObject, PROP_PAYLOAD, PROP_COORDINATES, PROP_LONG)
                  .orElseThrow(IllegalArgumentException::new);
          attachments.add(new LocationAttachment(latitude, longitude));
          break;
        case "FALLBACK":
          final String json = attachmentJsonObject.toString();
          attachments.add(new FallbackAttachment(json));
          break;
        default:
          throw new IllegalArgumentException("attachment type '" + type + "' is not supported");
      }
    }
    return attachments;
  }

  private URL getUrlFromString(String url) {
    try {
      return new URL(url);
    } catch (MalformedURLException e) {
      throw new IllegalArgumentException(e);
    }
  }
}