maropu commented on a change in pull request #29966:
URL: https://github.com/apache/spark/pull/29966#discussion_r533087617



##########
File path: core/src/main/scala/org/apache/spark/util/DependencyUtils.scala
##########
@@ -15,22 +15,122 @@
  * 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 {
+private[spark] object DependencyUtils extends Logging {
+
+  def getIvyProperties(): Seq[String] = {
+    Seq(
+      "spark.jars.excludes",
+      "spark.jars.packages",
+      "spark.jars.repositories",
+      "spark.jars.ivy",
+      "spark.jars.ivySettings"
+    ).map(sys.props.get(_).orNull)
+  }
+
+  /**
+   * Parse excluded list in ivy URL. When download ivy URL jar, Spark won't 
download transitive jar
+   * in excluded list.
+   *
+   * @param queryString Ivy URI query part string.
+   * @return Exclude list which contains grape parameters of exclude.
+   *         Example: Input:  
exclude=org.mortbay.jetty:jetty,org.eclipse.jetty:jetty-http
+   *         Output:  [org.mortbay.jetty:jetty, org.eclipse.jetty:jetty-http]
+   */
+  private def parseExcludeList(excludes: Array[String]): String = {
+    excludes.flatMap { excludeString =>
+      val excludes: Array[String] = excludeString.split(",")
+      if (excludes.exists(_.split(":").length != 2)) {
+        throw new URISyntaxException(excludeString,
+          "Invalid exclude string: expected 'org:module,org:module,..', found 
" + excludeString)
+      }
+      excludes
+    }.mkString(":")
+  }
+
+  /**
+   * Parse transitive parameter in ivy URL, default value is false.
+   *
+   * @param queryString Ivy URI query part string.
+   * @return Exclude list which contains grape parameters of transitive.
+   *         Example: Input:  exclude=org.mortbay.jetty:jetty&transitive=true
+   *         Output:  true
+   */
+  private def parseTransitive(transitives: Array[String]): Boolean = {
+    if (transitives.isEmpty) {
+      false
+    } else {
+      if (transitives.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")
+      }
+      transitives.last.toBoolean
+    }
+  }
+
+  /**
+   * Download Ivy URIs dependency jars.
+   *
+   * @param uri Ivy uri need to be downloaded. The URI format should be:
+   *              `ivy://group:module:version[?query]`
+   *            Ivy URI query part format should be:
+   *              `parameter=value&parameter=value...`
+   *            Note that currently ivy URI query part support two parameters:
+   *             1. transitive: whether to download dependent jars related to 
your ivy URL.
+   *                transitive=false or `transitive=true`, if not set, the 
default value is false.
+   *             2. exclude: exclusion list when download ivy URL jar and 
dependency jars.
+   *                The `exclude` parameter content is a ',' separated 
`group:module` pair string :
+   *                `exclude=group:module,group:module...`
+   * @return Comma separated string list of URIs of downloaded jars
+   */
+  def resolveMavenDependencies(uri: URI): String = {
+    val Seq(_, _, repositories, ivyRepoPath, ivySettingsPath) =
+      DependencyUtils.getIvyProperties()
+    val authority = uri.getAuthority
+    if (authority == null) {
+      throw new URISyntaxException(
+        authority, "Invalid url: Expected 'org:module:version', found null")
+    }
+    if (authority.split(":").length != 3) {
+      throw new URISyntaxException(
+        authority, "Invalid url: Expected 'org:module:version', found " + 
authority)
+    }
+
+    val uriQuery = uri.getQuery
+    val queryParams: Array[(String, String)] = if (uriQuery == null) {
+      Array.empty[(String, String)]
+    } else {
+      val mapTokens = uriQuery.split("&").map(_.split("="))
+      if (mapTokens.exists(_.length != 2)) {
+        throw new URISyntaxException(uriQuery, s"Invalid query string: 
$uriQuery")
+      }
+      mapTokens.map(kv => (kv(0), kv(1)))
+    }
+
+    resolveMavenDependencies(
+      parseTransitive(queryParams.filter(_._1.equals("transitive")).map(_._2)),

Review comment:
       We need to respect case-sensitivity for params?




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