How to retrieve link from email message using the Gmail plugin/GMail API for Java/Jakarta Mail API/...?
Question
I am using Katalon Studio, and need to retrieve some sign-up link from test email inbox. I found some API/service to access the test email inbox, can get the message I need from it, and it's a string of what looks like HTML.
I don't care about the HTML, I just want to "click on" the link in that email message!
How do I do that??
1 answers
solution1
0 ACCPTED 2022-12-12 05:28:35
Assuming you successfully have the message string, here's how you can retrieve the link from it , assuming that your email message retrival method call returns HTML string.
To save you some clicking:
import javax.xml.parsers.DocumentBuilderFactory
import javax.xml.xpath.XPathFactory
import org.w3c.dom.Element
// feel free to make this your own :)
public final class EmailUtils {
/**
* **NOTE**: forked from https://stackoverflow.com/a/2269464/2027839 , and then refactored
*
* Processes HTML, using XPath
*
* @param html
* @param xpath
* @return the result
*/
public static String ProcessHTML(String html, String xpath) {
final String properHTML = this.ToProperHTML(html);
final Element document = DocumentBuilderFactory.newInstance()
.newDocumentBuilder()
.parse(new ByteArrayInputStream( properHTML.bytes ))
.documentElement;
return XPathFactory.newInstance()
.newXPath()
.evaluate( xpath, document );
}
private static String ToProperHTML(String html) {
// SOURCE: https://stackoverflow.com/a/19125599/2027839
String properHTML = html.replaceAll( "(&(?!amp;))", "&" );
if (properHTML.contains('<!DOCTYPE html'))
return properHTML;
return """<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head></head>
<body>
${properHTML}
</body>
</html>
""";
}
}
From there, you'll have to log out your HTML message string (or put debug breakpoint around your method call and extract it from debugger), pretty print it , and from there, you can use your web-testing skills to create some xpath selector string for the actual link.
Then, you use my code like:
WebUI.navigateToUrl(yourEmailMessageContent, "${yourLinkXPath}/@href");
To be fair, email messages can take some time to hit inboxes. Hence you might also want to have some retry logic in place. Here is example from my real project code base:
import java.util.concurrent.TimeUnit
// ...rest of imports
public final class EmailUtils {
//...rest of code base
public static String ExtractSignUpLink() {
String link;
int retryAttempts;
ActionHandler.Handle({
link = this.ProcessHTML(this.GetLatestMessageBody(30),
"//a[.//div[@class = 'sign-mail-btn-text']]/@href");
}, { boolean success, ex ->
if (success)
return;
// handle ex
if (((GoogleJsonResponseException)ex).getDetails().getCode() >= 400)
throw ex;
sleep(1000 * 2**retryAttempts++);
}, TimeUnit.MINUTES.toSeconds(15))
return link;
}
//...rest of code base
}
public final class ActionHandler {
public static void Handle(Closure onAction, Closure onDone, long timeOut) {
long startTime = System.currentTimeSeconds();
while (System.currentTimeSeconds() < startTime + timeOut) {
try {
onDone(true, onAction());
return;
} catch (Exception ex) {
onDone(false, ex);
}
}
}
}
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