maropu commented on a change in pull request #29966:
URL: https://github.com/apache/spark/pull/29966#discussion_r533928892



##########
File path: core/src/main/scala/org/apache/spark/util/DependencyUtils.scala
##########
@@ -15,22 +15,158 @@
  * limitations under the License.
  */
 
-package org.apache.spark.deploy
+package org.apache.spark.util
 
 import java.io.File
-import java.net.URI
+import java.net.{URI, URISyntaxException}
 
 import org.apache.commons.lang3.StringUtils
 import org.apache.hadoop.conf.Configuration
 import org.apache.hadoop.fs.{FileSystem, Path}
 
 import org.apache.spark.{SecurityManager, SparkConf, SparkException}
+import org.apache.spark.deploy.SparkSubmitUtils
 import org.apache.spark.internal.Logging
-import org.apache.spark.util.{MutableURLClassLoader, Utils}
 
-private[deploy] object DependencyUtils extends Logging {
+case class IvyProperties(
+    packagesExclusions: String,
+    packages: String,
+    repositories: String,
+    ivyRepoPath: String,
+    ivySettingsPath: String)
+
+private[spark] object DependencyUtils extends Logging {
+
+  def getIvyProperties(): IvyProperties = {
+    val Seq(packagesExclusions, packages, repositories, ivyRepoPath, 
ivySettingsPath) = Seq(
+      "spark.jars.excludes",
+      "spark.jars.packages",
+      "spark.jars.repositories",
+      "spark.jars.ivy",
+      "spark.jars.ivySettings"
+    ).map(sys.props.get(_).orNull)
+    IvyProperties(packagesExclusions, packages, repositories, ivyRepoPath, 
ivySettingsPath)
+  }
+
+  /**
+   * Parse URI query string's parameter value of `transitive` and `exclude`.
+   * Other invalid parameters will be ignored.
+   *
+   * @param uri Ivy uri need to be downloaded.
+   * @return Tuple value of parameter `transitive` and `exclude` value.
+   *
+   *         1. transitive: whether to download dependency jar of ivy URI, 
default value is false
+   *            and this parameter value is case-sensitive. Invalid value will 
be treat as false.
+   *            Example: Input:  
exclude=org.mortbay.jetty:jetty&transitive=true
+   *            Output:  true
+   *
+   *         2. exclude: comma separated exclusions to apply when resolving 
transitive dependencies,
+   *            consists of `group:module` pairs separated by commas.
+   *            Example: Input:  
excludeorg.mortbay.jetty:jetty,org.eclipse.jetty:jetty-http
+   *            Output:  [org.mortbay.jetty:jetty,org.eclipse.jetty:jetty-http]
+   */
+  private def parseQueryParams(uri: URI): (Boolean, String) = {
+    val uriQuery = uri.getQuery
+    if (uriQuery == null) {
+      (false, "")
+    } else {
+      val mapTokens = uriQuery.split("&").map(_.split("="))
+      if (mapTokens.exists(token =>
+        token.length != 2 || StringUtils.isBlank(token(0)) || 
StringUtils.isBlank(token(1)))) {
+        throw new URISyntaxException(uri.toString, s"Invalid query string: 
$uriQuery")
+      }
+      val groupedParams = mapTokens.map(kv => (kv(0), kv(1))).groupBy(_._1)
+      // Parse transitive parameters (e.g., transitive=true) in an ivy URL, 
default value is false
+      var transitive: Boolean = false
+      groupedParams.get("transitive").foreach { params =>
+        if (params.length > 1) {
+          logWarning("It's best to specify `transitive` parameter in ivy URL 
query only once." +
+            " If there are multiple `transitive` parameter, we will select the 
last one")
+        }
+        params.map(_._2).foreach {
+          case "true" => transitive = true
+          case _ => transitive = false
+        }
+      }
+      // Parse an excluded list (e.g., 
exclude=org.mortbay.jetty:jetty,org.eclipse.jetty:jetty-http)
+      // in an ivy URL. When download ivy URL jar, Spark won't download 
transitive jar
+      // in a excluded list.
+      val exclusionList = groupedParams.get("exclude").map { params =>
+        params.map(_._2).flatMap { excludeString =>
+          val excludes = excludeString.split(",")
+          if (excludes.map(_.split(":")).exists(token =>
+            token.length != 2 || StringUtils.isBlank(token(0)) || 
StringUtils.isBlank(token(1)))) {
+            throw new URISyntaxException(uri.toString, "Invalid exclude 
string: " +
+              "expected 'org:module,org:module,..', found " + excludeString)
+          }
+          excludes
+        }.mkString(",")
+      }.getOrElse("")
+
+      val invalidParams = groupedParams
+        .filter(entry => !Seq("transitive", "exclude").contains(entry._1))
+        .keys.toArray.sorted
+      if (invalidParams.nonEmpty) {
+        logWarning(
+          s"Invalid parameters `${invalidParams.mkString(",")}` found in URI 
query `$uriQuery`.")
+      }

Review comment:
       nit format:
   ```
         val validParams = Set("transitive", "exclude")
         val invalidParams = 
groupedParams.keys.filterNot(validParams.contains).toSeq.sorted
         if (invalidParams.nonEmpty) {
           logWarning(s"Invalid parameters `${invalidParams.mkString(",")}` 
found " +
             s"in URI query `$uriQuery`.")
         }
   ```




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