[SPARK-15209] Fix display of job descriptions with single quotes in w…

…eb UI timeline

## What changes were proposed in this pull request?

This patch fixes an escaping bug in the Web UI's event timeline that caused Javascript errors when displaying timeline entries whose descriptions include single quotes.

The original bug can be reproduced by running

```scala
sc.setJobDescription("double quote: \" ")
sc.parallelize(1 to 10).count()

sc.setJobDescription("single quote: ' ")
sc.parallelize(1 to 10).count()
```

and then browsing to the driver UI. Previously, this resulted in an "Uncaught SyntaxError" because the single quote from the description was not escaped and ended up closing a Javascript string literal too early.

The fix implemented here is to change the relevant Javascript to define its string literals using double-quotes. Our escaping logic already properly escapes double quotes in the description, so this is safe to do.

## How was this patch tested?

Tested manually in `spark-shell` using the following cases:

```scala
sc.setJobDescription("double quote: \" ")
sc.parallelize(1 to 10).count()

sc.setJobDescription("single quote: ' ")
sc.parallelize(1 to 10).count()

sc.setJobDescription("ampersand: &")
sc.parallelize(1 to 10).count()

sc.setJobDescription("newline: \n text after newline ")
sc.parallelize(1 to 10).count()

sc.setJobDescription("carriage return: \r text after return ")
sc.parallelize(1 to 10).count()
```

/cc sarutak for review.

Author: Josh Rosen <joshrosen@databricks.com>

Closes #12995 from JoshRosen/SPARK-15209.

core/src/main/scala/org/apache/spark/ui/jobs/AllJobsPage.scala

@@ -23,6 +23,8 @@ import javax.servlet.http.HttpServletRequest
 import scala.collection.mutable.{HashMap, ListBuffer}
 import scala.xml._
 
+import org.apache.commons.lang3.StringEscapeUtils
+
 import org.apache.spark.JobExecutionStatus
 import org.apache.spark.ui.{ToolTips, UIUtils, WebUIPage}
 import org.apache.spark.ui.jobs.UIData.{ExecutorUIData, JobUIData}
@@ -87,9 +89,10 @@ private[ui] class AllJobsPage(parent: JobsTab) extends WebUIPage("") {
         case JobExecutionStatus.UNKNOWN => "unknown"
       }
 
-      // The timeline library treats contents as HTML, so we have to escape them; for the
-      // data-title attribute string we have to escape them twice since that's in a string.
+      // The timeline library treats contents as HTML, so we have to escape them. We need to add
+      // extra layers of escaping in order to embed this in a Javascript string literal.
       val escapedDesc = Utility.escape(displayJobDescription)
+      val jsEscapedDesc = StringEscapeUtils.escapeEcmaScript(escapedDesc)
       val jobEventJsonAsStr =
         s"""
            |{
@@ -99,7 +102,7 @@ private[ui] class AllJobsPage(parent: JobsTab) extends WebUIPage("") {
            |  'end': new Date(${completionTime}),
            |  'content': '<div class="application-timeline-content"' +
            |     'data-html="true" data-placement="top" data-toggle="tooltip"' +
-           |     'data-title="${Utility.escape(escapedDesc)} (Job ${jobId})<br>' +
+           |     'data-title="${jsEscapedDesc} (Job ${jobId})<br>' +
            |     'Status: ${status}<br>' +
            |     'Submitted: ${UIUtils.formatDate(new Date(submissionTime))}' +
            |     '${
@@ -109,7 +112,7 @@ private[ui] class AllJobsPage(parent: JobsTab) extends WebUIPage("") {
                        ""
                      }
                   }">' +
-           |    '${escapedDesc} (Job ${jobId})</div>'
+           |    '${jsEscapedDesc} (Job ${jobId})</div>'
            |}
          """.stripMargin
       jobEventJsonAsStr

core/src/main/scala/org/apache/spark/ui/jobs/JobPage.scala

@@ -23,6 +23,8 @@ import javax.servlet.http.HttpServletRequest
 import scala.collection.mutable.{Buffer, HashMap, ListBuffer}
 import scala.xml.{Node, NodeSeq, Unparsed, Utility}
 
+import org.apache.commons.lang3.StringEscapeUtils
+
 import org.apache.spark.JobExecutionStatus
 import org.apache.spark.scheduler.StageInfo
 import org.apache.spark.ui.{ToolTips, UIUtils, WebUIPage}
@@ -63,9 +65,10 @@ private[ui] class JobPage(parent: JobsTab) extends WebUIPage("job") {
       val submissionTime = stage.submissionTime.get
       val completionTime = stage.completionTime.getOrElse(System.currentTimeMillis())
 
-      // The timeline library treats contents as HTML, so we have to escape them; for the
-      // data-title attribute string we have to escape them twice since that's in a string.
+      // The timeline library treats contents as HTML, so we have to escape them. We need to add
+      // extra layers of escaping in order to embed this in a Javascript string literal.
       val escapedName = Utility.escape(name)
+      val jsEscapedName = StringEscapeUtils.escapeEcmaScript(escapedName)
       s"""
          |{
          |  'className': 'stage job-timeline-object ${status}',
@@ -74,7 +77,7 @@ private[ui] class JobPage(parent: JobsTab) extends WebUIPage("job") {
          |  'end': new Date(${completionTime}),
          |  'content': '<div class="job-timeline-content" data-toggle="tooltip"' +
          |   'data-placement="top" data-html="true"' +
-         |   'data-title="${Utility.escape(escapedName)} (Stage ${stageId}.${attemptId})<br>' +
+         |   'data-title="${jsEscapedName} (Stage ${stageId}.${attemptId})<br>' +
          |   'Status: ${status.toUpperCase}<br>' +
          |   'Submitted: ${UIUtils.formatDate(new Date(submissionTime))}' +
          |   '${
@@ -84,7 +87,7 @@ private[ui] class JobPage(parent: JobsTab) extends WebUIPage("job") {
                    ""
                  }
               }">' +
-         |    '${escapedName} (Stage ${stageId}.${attemptId})</div>',
+         |    '${jsEscapedName} (Stage ${stageId}.${attemptId})</div>',
          |}
        """.stripMargin
     }