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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.xpack.watcher.common.text.TextTemplate;
import org.elasticsearch.xpack.watcher.common.text.TextTemplateEngine;
import org.elasticsearch.common.Nullable;

import java.io.IOException;
import java.util.ArrayList;
Expand All @@ -29,7 +30,11 @@ public class SlackMessage implements MessageElement {
final String text;
final Attachment[] attachments;

public SlackMessage(String from, String[] to, String icon, String text, Attachment[] attachments) {
public SlackMessage(String from, String[] to, String icon, @Nullable String text, @Nullable Attachment[] attachments) {
if(text == null && attachments == null) {
throw new IllegalArgumentException("Both text and attachments cannot be null.");
}

this.from = from;
this.to = to;
this.icon = icon;
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@ public void testToXContent() throws Exception {
}
String icon = randomBoolean() ? null : randomAlphaOfLength(10);
String text = randomBoolean() ? null : randomAlphaOfLength(50);
Attachment[] attachments = randomBoolean() ? null : new Attachment[randomIntBetween(0, 2)];
Attachment[] attachments = (text != null && randomBoolean()) ? null : new Attachment[randomIntBetween(0, 2)];
if (attachments != null) {
for (int i = 0; i < attachments.length; i++) {
String fallback = randomBoolean() ? null : randomAlphaOfLength(10);
Expand Down Expand Up @@ -600,6 +600,22 @@ public void testUrlPathIsFiltered() throws Exception {
}
}

public void testCanHaveNullText() throws Exception {
SlackMessage slackMessage = new SlackMessage("from", new String[] {"to"}, "icon", null, new Attachment[1]);
assertNull(slackMessage.getText());
assertNotNull(slackMessage.getAttachments());
}

public void testCanHaveNullAttachments() throws Exception {
SlackMessage slackMessage = new SlackMessage("from", new String[] {"to"}, "icon", "text", null);
assertNotNull(slackMessage.getText());
assertNull(slackMessage.getAttachments());
}

public void testCannotHaveNullAttachmentsAndNullText() throws Exception {
expectThrows(IllegalArgumentException.class, () -> new SlackMessage("from", new String[]{"to"}, "icon", null, null));
}

private static void writeFieldIfNotNull(XContentBuilder builder, String field, Object value) throws IOException {
if (value != null) {
builder.field(field, value);
Expand Down