[WIP]Mechanism to push zip plugins.

DEVELOPER_GUIDE.md

@@ -5,6 +5,7 @@ So you want to contribute code to this project? Excellent! We're glad you're her
   - [Prerequisites](#prerequisites)
     - [Native platforms](#native-platforms)
   - [Building](#building)
+  - [Publish zips to maven](#to-publish-generated-plugin-zips-to-maven-repo)
   - [Using IntelliJ IDEA](#using-intellij-idea)
   - [Submitting Changes](#submitting-changes)
   - [Backports](#backports)
@@ -127,6 +128,15 @@ curl -XGET https://localhost:9200/_plugins/_security/authinfo -u 'admin:admin' -
   "sso_logout_url": null
 }
 ```
+## To Publish generated plugin zips to maven repo
+The generated plugin zip `opensearch-security-<version>.zip` after the build, inside the folder `build/distributions` can be published to maven repo. This can be done by including the project `pluginZips` inside `settings.gradle` file. Once added the generated plugin zip will be published to maven repo with following maven coordinates
+```
+  <groupId>org.opensearch.plugin</groupId>
+  <artifactId>opensearch-security</artifactId>
+  <version><version></version>
+  <packaging>zip</packaging>
+```
+To skip the publish, while this sub-project is still included, pass the flag as ` ext.publish = 'skip'` to file `build.gradle` inside `maven/plugin-zips/` folder.
 
 ## Using IntelliJ IDEA
 

maven/plugin-zips/build.gradle

@@ -0,0 +1,101 @@
+plugins {
+    id 'maven-publish'
+}
+
+ext {
+    isSnapshot = "true" == System.getProperty("build.snapshot", "true")
+    opensearch_version = System.getProperty("opensearch.version", "2.0.0-alpha1-SNAPSHOT")
+    buildVersionQualifier = System.getProperty("build.version_qualifier", "alpha1")
+    // 2.0.0-alpha1-SNAPSHOT -> 2.0.0.0-alpha1-SNAPSHOT
+    version_tokens = opensearch_version.tokenize('-')
+    opensearch_build = version_tokens[0] + '.0'
+    if (buildVersionQualifier) {
+        opensearch_build += "-${buildVersionQualifier}"
+        opensearch_build_nosnapshot = opensearch_build
+    }
+    if (isSnapshot) {
+        opensearch_build += "-SNAPSHOT"
+    }
+}
+
+
+allprojects {
+    // Default to the apache license
+    project.ext.licenseName = 'The Apache Software License, Version 2.0'
+    project.ext.licenseUrl = 'http://www.apache.org/licenses/LICENSE-2.0.txt'
+    publishing {
+            repositories {
+                maven {
+                    name = 'staging'
+                    url = "${rootProject.buildDir}/local-staging-repo"
+                }
+            }
+            publications {
+                // add license information to generated poms
+                all {
+                    pom.withXml { XmlProvider xml ->
+                        Node node = xml.asNode()
+                        node.appendNode('inceptionYear', '2021')
+
+                        Node license = node.appendNode('licenses').appendNode('license')
+                        license.appendNode('name', project.licenseName)
+                        license.appendNode('url', project.licenseUrl)
+
+                        Node developer = node.appendNode('developers').appendNode('developer')
+                        developer.appendNode('name', 'OpenSearch')
+                        developer.appendNode('url', 'https://github.com/opensearch-project/security')
+                    }
+                }
+            }
+        }
+}
+
+def group = "org.opensearch.plugin"
+def pluginversion = opensearch_build
+def component = "opensearch-security"
+def description = "OpenSearch Security plugin Zip"
+def zipFile = "${component}-${pluginversion}.zip"
+def zipArtifact = "${rootProject.buildDir}/distributions/${zipFile}"
+
+
+publishing {
+    publications { 
+        maven(MavenPublication) {
+            //Add ext.publish = 'skip' to skip publishing skip to maven staging repo
+            groupId = "${group}"
+            artifactId = "${component}"
+            version = "${pluginversion}"
+            // Add extension, to get <packaging>zip</packaging> as in pom file
+            artifact(zipArtifact) {
+                extension 'zip'
+            }
+            pom {
+              name = "${component}"
+              description = "${description}"
+            }
+        }
+    }
+}
+
+task printZipsPublishProperty {
+  doLast {
+      tasks.withType(PublishToMavenRepository).all { publishTask ->
+      if (publication.hasProperty('publish')) {
+          println(publication.publish)
+      }else {
+          println("null")
+      }
+    }
+  }
+}
+
+afterEvaluate {
+    tasks.withType(PublishToMavenRepository).all { publishTask ->                                   
+        publishTask.onlyIf { task ->                                                                  
+        if (publication.hasProperty('publish') && publication.publish == 'skip') {
+            return false                                                                    
+        }                                                                                           
+        return true                                                                                 
+       }   
+    } 
+}

settings.gradle

@@ -5,3 +5,7 @@
  */
 
 rootProject.name = 'opensearch-security'
+
+//Adding pluginZips project under maven folder, this is to publish generated plugin zips to maven repo
+include 'pluginZips'
+project(':pluginZips').projectDir = file('maven/plugin-zips')