Initial Import

.gitignore

+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+
+
+### STS ###
+target/
+.settings/
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*

README.md

+## Running the WKS service locally
+
+The WKS Service is a Maven multi-module project with each cloud implemention placed in its submodule. WKS service listen to records_change event of Storage Service. To build or run Schema Service locally, follow the below steps :
+
+1. Clone the os-wks repository from git . Below is the URL : 
+    [https://dev.azure.com/slb-swt/data-management/_git/os-wks](https://dev.azure.com/slb-swt/data-management/_git/os-wks)
+
+2. Navigate to the root of the wks project, os-wks. For building the project using command line, run below command :
+    ```bash
+    mvn clean install
+    ```
+
+    This will build the core project as well as all the underlying projects. If we want  to build projects for specific cloud vendor, we can use mvn --projects command. For example, if we want to build only for GCP(Google Cloud Platform), we can use below command :
+    ```bash
+    mvn --projects wks-core,provider/wks-gcp clean install
+    ```
+3. Run wks service in command line. We need to select which cloud vendor specific wks-service we want to run. For example, if we want to run wks-service for GCP, run the below command : 
+    ```bash 
+    # Running GCP : 
+    java -jar -Dspring.profiles.active=default provider\wks-gcp\target\os-wks-gcp-0.0.1-spring-boot.jar
+
+## License
+Copyright 2017-2020, Schlumberger
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at 
+
+[http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0)
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License
\ No newline at end of file

azure-pipelines.yml

+trigger:
+  branches:
+    include:
+    - master
+
+  paths:
+    exclude:
+      - README.md
+      - .gitignore    
+
+variables:
+  - group: MAVEN_BUILD_VARS
+  - name: osProjectName
+    value: wks
+  - name: dockerImageName
+    value: os-$(osProjectName)-app
+  - name: tag
+    value: $(Build.BuildNumber)
+  - name: dockerDir
+    value: provider/$(osProjectName)-gcp/docker
+  - name: deploymentName
+    value: os-$(osProjectName)-service
+
+stages:
+- stage: Build
+  jobs:
+  - job: Build
+    pool:
+      name: Hosted Ubuntu 1604
+      demands: Maven
+      
+    steps:
+    - task: DownloadSecureFile@1
+      name: gcrKey
+      inputs:
+        secureFile: gcr-push-key-file.json
+        
+    - task: DownloadSecureFile@1
+      name: kubeconfig
+      inputs:
+        secureFile: 'kubeconfig'
+        
+    - task: Maven@3
+      displayName: Maven Build
+      inputs:
+        mavenPomFile: 'pom.xml'
+        mavenOptions: '-Xmx3072m'
+        javaHomeOption: 'JDKVersion'
+        jdkVersionOption: '1.8'
+        jdkArchitectureOption: 'x64'
+        publishJUnitResults: true
+        testResultsFiles: '**/surefire-reports/TEST-*.xml'
+        options: '--settings maven/settings.xml -DVSTS_FEED_TOKEN=$(VSTS_FEED_TOKEN)'
+        goals: 'clean install package'
+    
+    - task: CopyFiles@2
+      displayName: 'Copy Artifacts to: $(build.artifactstagingdirectory)/os-$(osProjectName)'
+      inputs:
+        Contents: |
+          provider/$(osProjectName)-gcp/deployments/*
+          provider/$(osProjectName)-gcp/target/*-spring-boot.jar
+        TargetFolder: '$(build.artifactstagingdirectory)/os-$(osProjectName)'
+        flattenFolders: true
+      condition: succeeded()
+
+    - task: Bash@3
+      inputs:
+        targetType: 'inline'
+        script: |
+          #!/bin/bash
+              pushd $(dockerDir)
+              cat $(gcrKey.secureFilePath) | docker login -u _json_key --password-stdin https://gcr.io
+              echo $(dockerImageName)
+              docker-compose build $(dockerImageName)
+              docker tag gcr.io/opendes/$(dockerImageName) gcr.io/opendes/$(dockerImageName):$(tag)
+              docker push gcr.io/opendes/$(dockerImageName):$(tag)
+              docker push gcr.io/opendes/$(dockerImageName)
+              echo 'Push done.'
+             
+              kubectl --kubeconfig $(kubeconfig.secureFilePath) rollout restart deployment/$(deploymentName)
+              
+              popd
+              sleep 10
+              OUTPUT="{\"status\":\"UP\"}"
+              ENDPOINT=$(WKS_SERVICE_HEALTH_URL)
+              echo $ENDPOINT
+              
+              while [ -z "$STATUS" ]; do
+                STATUS=`curl -v --silent --http1.0 "$ENDPOINT" 2>&1 | grep "$OUTPUT"`
+                echo $STATUS
+                
+                if [ -z "$STATUS" ]; then
+                  echo "Endpoint is not up yet."
+                  sleep 10
+                else
+                  echo "Endpoint is up"
+                fi
+              done
+      condition: succeeded()
+      displayName: 'build,upload and deploy docker image'
+    
+    - task: Maven@3
+      displayName: 'Running IntegrationTest'
+      inputs:
+        mavenPomFile: '$(osProjectName)-core/pom.xml'
+        goals: 'verify'
+        options: '-P IntegrationTest --settings maven/settings.xml -DVSTS_FEED_TOKEN=$(VSTS_FEED_TOKEN)'
+        publishJUnitResults: false
+        javaHomeOption: 'JDKVersion'
+        mavenVersionOption: 'Default'
+        mavenAuthenticateFeed: false
+        effectivePomSkip: false
+        sonarQubeRunAnalysis: false
+      env:
+        INTEGRATION_TEST_AUDIENCE: $(INTEGRATION_TEST_AUDIENCE)
+        INTEGRATION_TESTER : $(INTEGRATION_TESTER)
+        WKS_BUCKET_NAME : $(WKS_BUCKET_NAME)
+        STORAGE_SERVICE_URL : $(STORAGE_SERVICE_URL)
+        
+      
+    - task: PublishBuildArtifacts@1
+      displayName: 'Publish Artifact: drop'
+      inputs:
+        PathtoPublish: '$(build.artifactstagingdirectory)/os-$(osProjectName)'
+        ArtifactName: 'drop'
+        publishLocation: 'Container'
+      condition: succeededOrFailed()
+      
+
+- stage: DeployToQA
+  condition: and(succeeded(), eq(variables['Build.Reason'], 'Manual'))
+  variables:
+    sourceImageName: gcr.io/opendes/$(dockerImageName)
+    destinationImageName: us.gcr.io/opendes-evt/$(dockerImageName)
+
+  jobs:
+    - job: DeployToQA
+
+      steps:
+
+        - task: DownloadSecureFile@1
+          name: gcrKey
+          inputs:
+            secureFile: cicd-push-image-to-cr-keyfile.json
+
+        - task: DownloadSecureFile@1
+          name: gcrKeyEvt
+          inputs:
+            secureFile: cicd-push-image-to-cr-evt-keyfile.json
+
+        - task: DownloadSecureFile@1
+          name: kuberConfigEvt
+          inputs:
+            secureFile: kubeconfig-evt-opendes-qa-us
+
+        - bash: |
+            #!/bin/bash
+            set -e
+
+            cat $(gcrKey.secureFilePath) | docker login -u _json_key --password-stdin https://gcr.io
+            docker pull $(sourceImageName):$(tag)
+
+            cat $(gcrKeyEvt.secureFilePath) | docker login -u _json_key --password-stdin https://us.gcr.io
+            docker tag $(sourceImageName):$(tag) $(destinationImageName):$(tag)
+            docker tag $(sourceImageName):$(tag) $(destinationImageName)
+            docker push $(destinationImageName):$(tag)
+            docker push $(destinationImageName)
+
+            kubectl --kubeconfig $(kuberConfigEvt.secureFilePath) rollout restart deployment/$(deploymentName)
\ No newline at end of file

maven/settings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
+    <servers>
+        <server>
+            <id>os-core</id>
+            <username>slb-des-ext-collaboration</username>
+            <!-- Treat this auth token like a password. Do not share it with anyone, including Microsoft support. -->
+            <!-- The generated token expires on or before 11/14/2019 -->
+            <password>${VSTS_FEED_TOKEN}</password>
+        </server>
+    </servers>
+</settings>
\ No newline at end of file

mvnw

+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven2 Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+  # TODO classpath?
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`which java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

mvnw.cmd

+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven2 Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a key stroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM enable echoing my setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%

pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<properties>
+		<java.version>1.8</java.version>
+		<maven.compiler.target>1.8</maven.compiler.target>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<springfox-version>2.7.0</springfox-version>
+	</properties>
+
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-dependencies</artifactId>
+				<version>2.2.6.RELEASE</version>
+				<type>pom</type>
+				<scope>import</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
+	<groupId>org.opengroup.osdu</groupId>
+	<artifactId>os-wks</artifactId>
+	<version>0.0.1</version>
+	<packaging>pom</packaging>
+	<name>os-wks</name>
+	<description>os wks service </description>
+
+	<modules>
+		<module>wks-core</module>
+		<module>provider/wks-gcp</module>
+	</modules>
+
+	<repositories>
+		<repository>
+			<id>os-core</id>
+			<url>https://pkgs.dev.azure.com/slb-des-ext-collaboration/_packaging/os-core/maven/v1</url>
+			<releases>
+				<enabled>true</enabled>
+			</releases>
+			<snapshots>
+				<enabled>true</enabled>
+			</snapshots>
+		</repository>
+	</repositories>
+</project>

provider/wks-gcp/docker/Dockerfile

+FROM openjdk:8-slim
+RUN apt-get update && apt-get install -y curl
+
+ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","-Dspring.profiles.active=kuber","/app.jar"]
+EXPOSE 8080
+
+ARG JAR_FILE
+COPY ${JAR_FILE} app.jar
+

provider/wks-gcp/docker/docker-compose.yml

+version: "3"
+services:
+  os-wks-app:
+    build:
+      args: 
+        JAR_FILE: target/os-wks-gcp-0.0.1-spring-boot.jar
+      context: ..
+      dockerfile: docker/Dockerfile
+    image: gcr.io/opendes/os-wks-app
+    ports:
+     - "8080:8080"

provider/wks-gcp/pom.xml

+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.opengroup.osdu</groupId>
+		<artifactId>os-wks</artifactId>
+		<version>0.0.1</version>
+		<relativePath>../../</relativePath>
+	</parent>
+	<artifactId>os-wks-gcp</artifactId>
+	<description>Google cloud related implementation stuff.</description>
+	<packaging>jar</packaging>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.opengroup.osdu</groupId>
+			<artifactId>os-wks-core</artifactId>
+			<version>0.0.1</version>
+		</dependency>
+		<dependency>
+			<groupId>org.opengroup.osdu</groupId>
+			<artifactId>os-core-common</artifactId>
+			<version>0.0.11</version>
+		</dependency>
+		<dependency>
+			<groupId>org.opengroup.osdu</groupId>
+			<artifactId>core-lib-gcp</artifactId>
+			<version>0.1.17</version>
+		</dependency>
+		<dependency>
+			<groupId>com.google.cloud</groupId>
+			<artifactId>google-cloud-storage</artifactId>
+			<version>1.105.0</version>
+		</dependency>
+		<dependency>
+			<groupId>com.google.cloud</groupId>
+			<artifactId>google-cloud-datastore</artifactId>
+			<version>1.102.2</version>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.mockito</groupId>
+			<artifactId>mockito-all</artifactId>
+			<version>1.10.19</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>com.google.apis</groupId>
+			<artifactId>google-api-services-iam</artifactId>
+			<version>v1-rev310-1.25.0</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.opengroup.osdu</groupId>
+			<artifactId>core-lib-gcp</artifactId>
+			<version>0.1.15</version>
+		</dependency>
+
+		<dependency>
+			<groupId>io.cucumber</groupId>
+			<artifactId>cucumber-java8</artifactId>
+			<version>5.4.0</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>io.cucumber</groupId>
+			<artifactId>cucumber-junit</artifactId>
+			<version>5.4.0</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>io.cucumber</groupId>
+			<artifactId>cucumber-guice</artifactId>
+			<version>5.4.0</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>com.google.inject</groupId>
+			<artifactId>guice</artifactId>
+			<version>4.2.0</version>
+			<scope>test</scope>
+		</dependency>
+
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+				<executions>
+					<execution>
+						<goals>
+							<goal>repackage</goal>
+						</goals>
+						<configuration>
+							<classifier>spring-boot</classifier>
+							<mainClass>
+								org.opengroup.osdu.wks.WksServiceApplication
+							</mainClass>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+
+			<plugin>
+				<artifactId>maven-war-plugin</artifactId>
+				<configuration>
+					<failOnMissingWebXml>false</failOnMissingWebXml>
+				</configuration>
+			</plugin>
+
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-surefire-plugin</artifactId>
+				<version>3.0.0-M3</version>
+				<configuration>
+					<skipTests>${skipUnitTests}</skipTests>
+					<forkCount>3</forkCount>
+					<reuseForks>true</reuseForks>
+					<argLine>-Xmx1024m -XX:MaxPermSize=256m</argLine>
+				</configuration>
+			</plugin>
+
+		</plugins>
+	</build>
+
+
+</project>
\ No newline at end of file

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/GcpConfiguration.java

+package org.opengroup.osdu.wks;
+
+import org.opengroup.osdu.core.gcp.multitenancy.TenantFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class GcpConfiguration {
+
+    @Bean
+    public TenantFactory getTenantFactory() {
+        return new TenantFactory();
+    }
+
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/constants/Constants.java

+package org.opengroup.osdu.wks.constants;
+
+public class Constants {
+
+    public static final String SUBSCRIPTION_ID = "records-changed-sub-%s-wks";
+    public static final String BEARER= "Bearer ";
+    public static final String DATA_PARTITION_ID = "data-partition-id";
+    public static final String CORRELATION_ID = "correlation-id";
+    public static final String MAPPING_NOT_PRESENT = "Mapping not present";
+    public static final String MAPPING_MULTIPLE_FILE_FOUND = "Expected single mapping file";
+    public static final String COLON_SEPARATOR = ":";
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/credentials/GoogleIamHelper.java

+package org.opengroup.osdu.wks.credentials;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+
+import org.springframework.stereotype.Component;
+
+import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
+import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
+import com.google.api.client.http.HttpTransport;
+
+@Component
+public class GoogleIamHelper {
+
+    public HttpTransport retrieveHttpTransport() throws GeneralSecurityException, IOException {
+        return GoogleNetHttpTransport.newTrustedTransport();
+    }
+
+    public GoogleCredential retriveCredential() throws IOException {
+        return GoogleCredential.getApplicationDefault();
+    }
+
+    
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/credentials/JwtTokenGenerator.java

+package org.opengroup.osdu.wks.credentials;
+
+import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.json.JsonFactory;
+import com.google.api.client.json.jackson2.JacksonFactory;
+import com.google.api.services.iam.v1.Iam;
+import com.google.api.services.iam.v1.IamScopes;
+import com.google.api.services.iam.v1.model.SignJwtRequest;
+import com.google.api.services.iam.v1.model.SignJwtResponse;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import lombok.Setter;
+import lombok.extern.java.Log;
+import org.apache.http.HttpHeaders;
+import org.apache.http.entity.ContentType;
+import org.opengroup.osdu.core.common.model.tenant.TenantInfo;
+import org.opengroup.osdu.wks.constants.Constants;
+import org.opengroup.osdu.wks.exceptions.ApplicationException;
+import org.opengroup.osdu.wks.provider.interfaces.UserCredential;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Component;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.client.RestTemplate;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.util.*;
+import java.util.logging.Level;
+
+@Log
+@Component("userCredential")
+public class JwtTokenGenerator implements UserCredential {
+
+    private final JsonFactory jsonFactory = new JacksonFactory();
+    private static final String SERVICE_ACCOUNT_NAME_FORMAT = "projects/%s/serviceAccounts/%s";
+    private static final String GOOGLE_ID_TOKEN_URL= "https://www.googleapis.com/oauth2/v4/token";
+    private static final String JWT_AUDIENCE = "https://www.googleapis.com/oauth2/v4/token";
+    private static final String GRANT_TYPE = "grant_type";
+    private static final String ASSERTION = "assertion";
+    private static final String URN_OAUTH_JWT_BEARER = "urn:ietf:params:oauth:grant-type:jwt-bearer";
+
+
+    @Setter
+    private Iam iam;
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    @Autowired
+    private GoogleIamHelper googleIamHelper;
+
+    @Value("${GOOGLE_AUDIENCES}")
+    private String targetAudience;
+
+    public String getIdToken(TenantInfo tenant) throws ApplicationException {
+        try {
+
+            String signedJwt = getSignedJWT(tenant);
+
+            JsonObject jsonContent = postToUrl(signedJwt);
+
+            if (!jsonContent.has("id_token")) {
+                log.log(Level.SEVERE, String.format("Google IAM response: %s", jsonContent.toString()));
+                throw new ApplicationException("Authorization Failed");
+            }
+            return Constants.BEARER+jsonContent.get("id_token").getAsString();
+        } catch (ApplicationException | IOException | GeneralSecurityException e) {
+            throw new ApplicationException("Error generating token", e);
+        }
+    }
+
+    private String getSignedJWT(TenantInfo tenant) throws IOException, GeneralSecurityException {
+        Map<String, Object> signJwtPayload = this.getJWTCreationPayload(tenant);
+        SignJwtRequest signJwtRequest = new SignJwtRequest();
+        signJwtRequest.setPayload(jsonFactory.toString(signJwtPayload));
+
+        String serviceAccountName = String.format(SERVICE_ACCOUNT_NAME_FORMAT, tenant.getProjectId(),
+                tenant.getServiceAccount());
+        Iam.Projects.ServiceAccounts.SignJwt signJwt = this.getIam().projects().serviceAccounts()
+                .signJwt(serviceAccountName, signJwtRequest);
+        SignJwtResponse signJwtResponse = signJwt.execute();
+        return signJwtResponse.getSignedJwt();
+    }
+
+    private JsonObject postToUrl(String signedJwt){
+        HttpEntity<Object> payload = populatePayload(signedJwt);
+        ResponseEntity<String> entity = restTemplate.postForEntity(GOOGLE_ID_TOKEN_URL, payload, String.class);
+        return new JsonParser().parse(Objects.requireNonNull(entity.getBody())).getAsJsonObject();
+    }
+
+    private HttpEntity<Object> populatePayload(String signedJwt) {
+        MultiValueMap<String, String> headers = new LinkedMultiValueMap<>();
+        headers.add(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_FORM_URLENCODED.getMimeType());
+        MultiValueMap<String, String> body = new LinkedMultiValueMap<>();
+        body.add(GRANT_TYPE, URN_OAUTH_JWT_BEARER);
+        body.add(ASSERTION, signedJwt);
+        return new HttpEntity<>(body, headers);
+    }
+
+    public Iam getIam() throws GeneralSecurityException, IOException {
+
+        if (this.iam == null) {
+            HttpTransport httpTransport = googleIamHelper.retrieveHttpTransport();
+            GoogleCredential credential = googleIamHelper.retriveCredential();
+            if (credential.createScopedRequired()) {
+                List<String> scopes = new ArrayList<>();
+                scopes.add(IamScopes.CLOUD_PLATFORM);
+                credential = credential.createScoped(scopes);
+            }
+            this.iam = new Iam.Builder(httpTransport, jsonFactory, credential).build();
+        }
+
+        return this.iam;
+    }
+
+    private Map<String, Object> getJWTCreationPayload(TenantInfo tenant) {
+
+        Map<String, Object> payload = new HashMap<>();
+        payload.put("target_audience", targetAudience);
+        payload.put("exp", System.currentTimeMillis() / 1000 + 3600);
+        payload.put("iat", System.currentTimeMillis() / 1000);
+        payload.put("iss", tenant.getServiceAccount());
+        payload.put("aud", JWT_AUDIENCE);
+
+        return payload;
+    }
+
+
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/pubsub/PubSubMessageReceiver.java

+package org.opengroup.osdu.wks.pubsub;
+
+import java.util.Arrays;
+import java.util.logging.Level;
+
+import org.apache.commons.lang3.StringUtils;
+import org.opengroup.osdu.wks.constants.Constants;
+import org.opengroup.osdu.wks.exceptions.ApplicationException;
+import org.opengroup.osdu.wks.exceptions.BadRequestException;
+import org.opengroup.osdu.wks.model.RawRecordDetails;
+import org.opengroup.osdu.wks.service.WKSService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.google.cloud.pubsub.v1.AckReplyConsumer;
+import com.google.cloud.pubsub.v1.MessageReceiver;
+import com.google.gson.Gson;
+import com.google.pubsub.v1.PubsubMessage;
+
+import lombok.extern.java.Log;
+
+@Service
+@Log
+public class PubSubMessageReceiver implements MessageReceiver {
+
+    @Autowired
+    private WKSService wKSService;
+
+    @Override
+    public void receiveMessage(PubsubMessage pubsubMessage, AckReplyConsumer ackReplyConsumer) {
+        try {
+            String dataPartitionId = pubsubMessage.getAttributesMap().get(Constants.DATA_PARTITION_ID);
+            String correlationId = pubsubMessage.getAttributesMap().get(Constants.CORRELATION_ID);
+            processWksTransform(pubsubMessage, dataPartitionId, correlationId);
+        } catch (BadRequestException e) {
+            log.severe(e.getErrorMsg());
+            log.log(Level.SEVERE, String.format("Bad Request Reason: %s, pubsub message id: %s", e.getErrorMsg(),
+                    pubsubMessage.getMessageId()));
+        } catch (ApplicationException e) {
+            log.severe(e.getErrorMsg());
+            log.log(Level.SEVERE, String.format("Application Error Reason: %s, pubsub message id: %s", e.getErrorMsg(),
+                    pubsubMessage.getMessageId()));
+        }
+        ackReplyConsumer.ack();
+    }
+
+    private void processWksTransform(PubsubMessage pubsubMessage, String dataPartitionId, String correlationId)
+            throws BadRequestException, ApplicationException {
+        log.log(Level.INFO, "Transformation started for " + pubsubMessage.getMessageId());
+        RawRecordDetails[] rawRecordDetails = retriveDataFromPubSubMsg(pubsubMessage);
+        log.log(Level.INFO, Arrays.toString(rawRecordDetails));
+        wKSService.transform(rawRecordDetails,
+                dataPartitionId,
+                correlationId);
+        log.log(Level.INFO, "Transformation completed for" + pubsubMessage.getMessageId());
+    }
+
+    private RawRecordDetails[] retriveDataFromPubSubMsg(PubsubMessage msg) throws BadRequestException {
+        String messageData = msg.getData().toStringUtf8();
+        return getRecordsChangeData(messageData);
+    }
+
+    /**
+     * This method receives Base64 encoded pubsub data and returns decoded data as
+     * {@link RawRecordDetails}
+     *
+     * @param data
+     * @return {@link RawRecordDetails}
+     * @throws BadRequestException
+     */
+    private RawRecordDetails[] getRecordsChangeData(String data) throws BadRequestException {
+        Gson gson = new Gson();
+        if (StringUtils.isBlank(data)) {
+            throw new BadRequestException("PubSub message not present");
+        }
+
+        return gson.fromJson(data, RawRecordDetails[].class);
+    }
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/pubsub/SubscriptionListener.java

+package org.opengroup.osdu.wks.pubsub;
+
+import org.springframework.stereotype.Component;
+
+import com.google.api.core.ApiService.Listener;
+import com.google.api.core.ApiService.State;
+
+import lombok.extern.java.Log;
+
+@Log
+@Component
+public class SubscriptionListener extends Listener {
+
+    @Override
+    public void failed(State from, Throwable failure) {
+        log.severe(failure.getStackTrace()[0].toString());
+    }
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/pubsub/SubscriptionManagerImpl.java

+package org.opengroup.osdu.wks.pubsub;
+
+import com.google.api.gax.batching.FlowControlSettings;
+import com.google.cloud.pubsub.v1.Subscriber;
+import com.google.common.util.concurrent.MoreExecutors;
+import com.google.pubsub.v1.ProjectSubscriptionName;
+import lombok.Setter;
+import org.opengroup.osdu.core.common.model.tenant.TenantInfo;
+import org.opengroup.osdu.core.common.provider.interfaces.ITenantFactory;
+import org.opengroup.osdu.wks.constants.Constants;
+import org.opengroup.osdu.wks.provider.interfaces.SubscriptionManager;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import java.util.Collection;
+
+@Component
+public class SubscriptionManagerImpl implements SubscriptionManager {
+
+    @Autowired
+    private ITenantFactory tenantFactory;
+
+    @Autowired
+    private PubSubMessageReceiver pubSubMessageReceiver;
+
+    @Autowired
+    private SubscriptionListener subscriptionListener;
+
+    @Setter
+    private String projectID;
+
+    public SubscriptionManagerImpl(@Value("${GOOGLE_CLOUD_PROJECT}") String projectID){
+        this.projectID =projectID;
+    }
+
+    @Override
+    public void subscribeRecordsChangeEvent() {
+        Collection<TenantInfo> tenants = tenantFactory.listTenantInfo();
+        for (TenantInfo tenant : tenants)
+            subscribeTenant(tenant.getName());
+    }
+
+    private FlowControlSettings buildFlowControl() {
+        long elementCount = 5;
+        return FlowControlSettings.newBuilder().setMaxOutstandingElementCount(elementCount).build();
+    }
+
+    private void subscribeTenant(String tenantName) {
+        String projectId = projectID;
+        subscribeToTopic(projectId, tenantName);
+    }
+
+    private void subscribeToTopic(String projectId, String tenantName) {
+        String subscriptionId = String.format(Constants.SUBSCRIPTION_ID, tenantName);
+        subscribe(subscriptionId, projectId);
+    }
+
+    private void subscribe(String subscriptionId, String projectId) {
+        ProjectSubscriptionName subscriptionName = ProjectSubscriptionName.of(projectId, subscriptionId);
+        Subscriber subscriber = Subscriber.newBuilder(subscriptionName, pubSubMessageReceiver)
+                .setFlowControlSettings(buildFlowControl()).build();
+        subscriber.addListener(subscriptionListener, MoreExecutors.directExecutor());
+        subscriber.startAsync();
+    }
+
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/storage/MappingStoreImpl.java

+package org.opengroup.osdu.wks.storage;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.api.gax.paging.Page;
+import com.google.cloud.storage.Blob;
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.Storage.BlobListOption;
+import lombok.extern.java.Log;
+import org.opengroup.osdu.wks.constants.Constants;
+import org.opengroup.osdu.wks.model.MappingsModel;
+import org.opengroup.osdu.wks.provider.interfaces.MappingStore;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * This class is to fetch Mapping file from Google storage bucket.
+ * 
+ */
+
+@Log
+@Service("mappingStore")
+public class MappingStoreImpl implements MappingStore {
+
+    @Autowired
+	private StorageFactory storageFactory;
+
+	@Value("${GOOGLE_CLOUD_PROJECT}-wks")
+	private String bucketName;
+
+	/**
+	 * This method accepts filePath to fetch mapping file from
+	 * Google storage bucket
+	 *
+	 */
+	@Override
+	public MappingsModel getMapping(final String fileName) {
+		MappingsModel mappings = null;
+		try {
+			Blob mappingContent = retrieveMappingContent( fileName);
+			mappings = convertBlobToMappings(mappingContent);
+		} catch (IOException e) {
+			log.warning( e.getMessage());
+		}
+		return mappings;
+	}
+
+	private MappingsModel convertBlobToMappings(Blob blob) throws IOException {
+		byte[] content = blob.getContent();
+		String jsonStr = new String(content);
+		ObjectMapper mapper = new ObjectMapper();
+		return mapper.readValue(jsonStr, MappingsModel.class);
+	}
+
+	private Blob retrieveMappingContent(String fileName) throws IOException {
+		Storage storage = storageFactory.retrieveStorage();
+		BlobListOption prefix = Storage.BlobListOption
+				.prefix(fileName);
+		BlobListOption currentDir = Storage.BlobListOption.currentDirectory();
+		Page<Blob> blobs = storage.list(this.bucketName, currentDir, prefix);
+
+		return retrieveSingleBlob(blobs);
+	}
+
+	private Blob retrieveSingleBlob(Page<Blob> blobs) throws IOException {
+		List<Blob> blobList = new ArrayList<>();
+		for (Blob blob : blobs.iterateAll()) {
+			blobList.add(blob);
+		}
+
+		if (blobList.size() > 1) {
+			throw new IOException(Constants.MAPPING_MULTIPLE_FILE_FOUND);
+		}
+
+		if (blobList.isEmpty()) {
+			throw new FileNotFoundException(Constants.MAPPING_NOT_PRESENT);
+		}
+
+		return blobList.get(0);
+	}
+}

provider/wks-gcp/src/main/java/org/opengroup/osdu/wks/storage/StorageFactory.java

+package org.opengroup.osdu.wks.storage;
+
+import org.springframework.stereotype.Component;
+
+import com.google.cloud.storage.Storage;
+import com.google.cloud.storage.StorageOptions;
+
+@Component
+public class StorageFactory {
+	public Storage retrieveStorage() {
+		return StorageOptions.getDefaultInstance().getService();
+	}
+}