Add helm validator sources

Issue-ID: SDC-3185
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: I32dea3b4294a90c4dfc75864fb4200f044e7a0b6

23 files changed, 1344 insertions, 0 deletions

diff --git a/src/main/java/org/onap/sdc/helmvalidator/HelmValidatorApplication.java b/src/main/java/org/onap/sdc/helmvalidator/HelmValidatorApplication.java
new file mode 100644
index 0000000..b8bed69
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/HelmValidatorApplication.java
@@ -0,0 +1,33 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class HelmValidatorApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HelmValidatorApplication.class, args);
+    }
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/api/SupportedVersionsController.java b/src/main/java/org/onap/sdc/helmvalidator/api/SupportedVersionsController.java
new file mode 100644
index 0000000..1a92624
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/api/SupportedVersionsController.java
@@ -0,0 +1,52 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.api;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import org.onap.sdc.helmvalidator.helm.versions.SupportedVersionsProvider;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class SupportedVersionsController {
+
+    private final SupportedVersionsProvider versionsProvider;
+
+    @Autowired
+    public SupportedVersionsController(SupportedVersionsProvider provider) {
+        this.versionsProvider = provider;
+    }
+
+    @GetMapping("/versions")
+    public ResponseEntity<Map<String, List<String>>> supportedVersions() {
+        return mapVersionsToResponseEntity(versionsProvider.getVersions());
+    }
+
+    private ResponseEntity<Map<String, List<String>>> mapVersionsToResponseEntity(List<String> versions) {
+
+        return new ResponseEntity<>(Collections.singletonMap("versions", versions), HttpStatus.OK);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/api/ValidationController.java b/src/main/java/org/onap/sdc/helmvalidator/api/ValidationController.java
new file mode 100644
index 0000000..a4e476c
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/api/ValidationController.java
@@ -0,0 +1,68 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.api;
+
+import org.onap.sdc.helmvalidator.helm.validation.ValidationService;
+import org.onap.sdc.helmvalidator.helm.validation.model.ValidationResult;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+@RestController
+public class ValidationController {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ValidationController.class);
+
+    private final ValidationService validationService;
+
+    @Autowired
+    public ValidationController(ValidationService validationService) {
+        this.validationService = validationService;
+    }
+
+    /**
+     * Validates Helm chart.
+     *
+     * @param version        requested version of Helm client to be used
+     * @param file           packaged Helm chart file
+     * @param isLinted       flag deciding if chart should be linted
+     * @param isStrictLinted flag deciding if chart should be linted with strict option turned on
+     * @return Response with result of validation
+     */
+    @PostMapping("/validate")
+    public ResponseEntity<ValidationResult> validate(
+        @RequestParam(value = "versionDesired", required = false) String version,
+        @RequestParam("file") MultipartFile file,
+        @RequestParam(value = "isLinted", required = false, defaultValue = "false") boolean isLinted,
+        @RequestParam(value = "isStrictLinted", required = false, defaultValue = "false") boolean isStrictLinted) {
+        LOGGER.debug("Received file: {}, size: {}, helm version: {}",
+            file.getOriginalFilename(), file.getSize(), version);
+        ValidationResult result = validationService
+            .process(version, file, isLinted, isStrictLinted);
+        return new ResponseEntity<>(result, HttpStatus.OK);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandler.java b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandler.java
new file mode 100644
index 0000000..332a923
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorHandler.java
@@ -0,0 +1,129 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.errorhandling;
+
+import org.onap.sdc.helmvalidator.api.ValidationController;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.SaveFileException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ApiVersionNotFoundException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.NotSupportedApiVersionException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ReadFileException;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice(assignableTypes = ValidationController.class)
+public class ValidationErrorHandler {
+
+    /**
+     * BashExecutionException handler.
+     *
+     * @param exception Exception that occurs during execution of bash command
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = BashExecutionException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(BashExecutionException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.INTERNAL_SERVER_ERROR
+        );
+    }
+
+    /**
+     * SaveFileException handler.
+     *
+     * @param exception Exception that occurs during file saving
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = SaveFileException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(SaveFileException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.INTERNAL_SERVER_ERROR
+        );
+    }
+
+    /**
+     * NotSupportedVersionException handler.
+     *
+     * @param exception Exception that occurs when not supported Helm version is requested for validation
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = NotSupportedVersionException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(NotSupportedVersionException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.BAD_REQUEST
+        );
+    }
+
+    /**
+     * ApiVersionNotFoundException handler.
+     *
+     * @param exception Exception that occurs when API version cannot be derived from Helm chart
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = ApiVersionNotFoundException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(ApiVersionNotFoundException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.BAD_REQUEST
+        );
+    }
+
+    /**
+     * NotSupportedApiVersionException handler.
+     *
+     * @param exception Exception that occurs when API version from Helm chart is not supported
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = NotSupportedApiVersionException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(NotSupportedApiVersionException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.BAD_REQUEST
+        );
+    }
+
+    /**
+     * ReadFileException handler.
+     *
+     * @param exception Exception that occurs during reading of Helm chart
+     * @return ResponseEntity with ValidationErrorResponse created from given exception
+     */
+    @ExceptionHandler(value = ReadFileException.class)
+    public ResponseEntity<ValidationErrorResponse> handle(ReadFileException exception) {
+        return getErrorResponseEntity(
+            exception.getMessage(),
+            HttpStatus.INTERNAL_SERVER_ERROR
+        );
+    }
+
+    private ResponseEntity<ValidationErrorResponse> getErrorResponseEntity(String errorMessage, HttpStatus status) {
+        ValidationErrorResponse errorResponse = new ValidationErrorResponse(errorMessage);
+        return new ResponseEntity<>(
+            errorResponse,
+            status
+        );
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorResponse.java b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorResponse.java
new file mode 100644
index 0000000..0f1fded
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/errorhandling/ValidationErrorResponse.java
@@ -0,0 +1,34 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.errorhandling;
+
+class ValidationErrorResponse {
+
+    private final String message;
+
+    ValidationErrorResponse(String message) {
+        this.message = message;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutor.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutor.java
new file mode 100644
index 0000000..0bebc0a
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/BashExecutor.java
@@ -0,0 +1,69 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.List;
+import java.util.stream.Collectors;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.model.BashOutput;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+@Service
+public class BashExecutor {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(
+        ValidationService.class);
+
+    BashOutput execute(String helmCommand) {
+
+        try {
+            ProcessBuilder pb = new ProcessBuilder("bash", "-c", helmCommand);
+            pb.redirectErrorStream(true);
+            LOGGER.debug("Start process");
+            Process process = pb.start();
+
+            List<String> processOutput = readOutputAndCloseProcess(process);
+            return new BashOutput(process.exitValue(), processOutput);
+        } catch (IOException | InterruptedException e) {
+            throw new BashExecutionException("Error during bash execution: ", e);
+        }
+    }
+
+    private List<String> readOutputAndCloseProcess(Process process) throws IOException, InterruptedException {
+
+        final InputStream inputStream = process.getInputStream();
+        final List<String> lines = new BufferedReader(new InputStreamReader(inputStream))
+            .lines().collect(Collectors.toList());
+
+        // For compatibility with Helm2 and Helm3
+        process.waitFor();
+        inputStream.close();
+        process.destroy();
+
+        return lines;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/FileManager.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/FileManager.java
new file mode 100644
index 0000000..3617df7
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/FileManager.java
@@ -0,0 +1,72 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+import java.time.Instant;
+import org.onap.sdc.helmvalidator.helm.validation.exception.SaveFileException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+public class FileManager {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(FileManager.class);
+    private final String basePath;
+
+    @Autowired
+    FileManager(@Value("${app.config.charts-base-path}") String basePath) {
+        this.basePath = basePath;
+    }
+
+    String saveFile(MultipartFile file) {
+        LOGGER.debug("Base PATH: {}", basePath);
+        try {
+            String filePath = basePath + File.separator + generateFileName(file.getOriginalFilename());
+            LOGGER.info("Attempt to save file : {}", filePath);
+            Files.copy(file.getInputStream(), Paths.get(filePath), StandardCopyOption.REPLACE_EXISTING);
+            return filePath;
+        } catch (IOException e) {
+            throw new SaveFileException("Cannot save file: " + file.getOriginalFilename(), e);
+        }
+    }
+
+    void removeFile(String path) {
+        try {
+            LOGGER.debug("Attempt to delete file : {}", path);
+            Files.deleteIfExists(Paths.get(path));
+        } catch (IOException e) {
+            LOGGER.warn("Cannot delete file: {}, Exception: {}", path, e.getStackTrace());
+        }
+    }
+
+    private String generateFileName(String fileName) {
+        return Instant.now().toEpochMilli() + "_" + fileName;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/ValidationService.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/ValidationService.java
new file mode 100644
index 0000000..1e6cedb
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/ValidationService.java
@@ -0,0 +1,221 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+import org.onap.sdc.helmvalidator.helm.validation.exception.BashExecutionException;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.onap.sdc.helmvalidator.helm.validation.model.BashOutput;
+import org.onap.sdc.helmvalidator.helm.validation.model.LintValidationResult;
+import org.onap.sdc.helmvalidator.helm.validation.model.TemplateValidationResult;
+import org.onap.sdc.helmvalidator.helm.validation.model.ValidationResult;
+import org.onap.sdc.helmvalidator.helm.versions.ChartBasedVersionProvider;
+import org.onap.sdc.helmvalidator.helm.versions.SupportedVersionsProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.multipart.MultipartFile;
+
+@Service
+public class ValidationService {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ValidationService.class);
+    private static final String TEMPLATE_OPTION = "template";
+    private static final String LINT_OPTION = "lint";
+    private static final String HELM_SUMMARY_MESSAGE_PATTERN =
+        "Error: \\d* chart\\(s\\) linted, \\d* chart\\(s\\) failed";
+    private static final boolean INVALID_RESULT = false;
+
+    private final FileManager fileManager;
+
+    private final BashExecutor executor;
+
+    private final SupportedVersionsProvider supportedVersionsProvider;
+
+    private final ChartBasedVersionProvider chartBasedVersionProvider;
+
+
+    /**
+     * Constructor for ValidationService.
+     *
+     * @param fileManager               object responsible for file manging
+     * @param executor                  object responsible for running shell commands
+     * @param supportedVersionsProvider object providing supported versions of Helm
+     * @param chartBasedVersionProvider object allowing to derive Helm version from a chart
+     */
+    @Autowired
+    public ValidationService(
+        FileManager fileManager, BashExecutor executor,
+        SupportedVersionsProvider supportedVersionsProvider,
+        ChartBasedVersionProvider chartBasedVersionProvider) {
+        this.fileManager = fileManager;
+        this.executor = executor;
+        this.supportedVersionsProvider = supportedVersionsProvider;
+        this.chartBasedVersionProvider = chartBasedVersionProvider;
+    }
+
+    /**
+     * Process Helm chart package with given options.
+     *
+     * @param desiredVersion requested version of Helm client to be used
+     * @param file           packaged Helm chart file
+     * @param isLinted       flag deciding if chart should be linted
+     * @param isStrictLinted flag deciding if chart should be linted with strict option turned on
+     * @return Result of Helm chart validation
+     */
+    public ValidationResult process(String desiredVersion, MultipartFile file, boolean isLinted,
+        boolean isStrictLinted) {
+        String chartPath = fileManager.saveFile(file);
+        try {
+            String helmVersion = getSupportedHelmVersion(desiredVersion, chartPath);
+            return validateChart(helmVersion, file, isLinted, isStrictLinted, chartPath);
+        } finally {
+            LOGGER.info("File process finished");
+            fileManager.removeFile(chartPath);
+        }
+    }
+
+    private String getSupportedHelmVersion(String desiredVersion, String chartPath) {
+        String helmVersion = getHelmVersion(desiredVersion, chartPath);
+
+        if (isNotSupportedVersion(helmVersion)) {
+            throw new NotSupportedVersionException(helmVersion);
+        }
+
+        return helmVersion;
+    }
+
+    private String getHelmVersion(String desiredVersion, String chartPath) {
+        if (desiredVersion == null) {
+            return chartBasedVersionProvider.getVersion(chartPath);
+        }
+
+        if (desiredVersion.startsWith("v")) {
+            String helmMajorVersion = desiredVersion.substring(1);
+            return supportedVersionsProvider.getLatestVersion(helmMajorVersion);
+        }
+
+        return desiredVersion;
+    }
+
+    private ValidationResult validateChart(String version, MultipartFile file, boolean isLinted, boolean isStrictLinted,
+        String chartPath) {
+        LOGGER.info("Start validation of file: {}, with helm version: {}",
+            file.getOriginalFilename(), version);
+
+        TemplateValidationResult templateValidationResult = runHelmTemplate(
+            buildHelmTemplateCommand(version, chartPath));
+        LOGGER.info("Helm template finished");
+
+        if (isLinted) {
+            LOGGER.info("Start helm lint, strict: {}", isStrictLinted);
+            LintValidationResult lintValidationResult = runHelmLint(
+                buildHelmLintCommand(version, chartPath, isStrictLinted));
+            LOGGER.info("Helm lint finished");
+            return new ValidationResult(templateValidationResult, lintValidationResult, version);
+        }
+
+        return new ValidationResult(templateValidationResult, version);
+    }
+
+    private boolean isNotSupportedVersion(String version) {
+        return !supportedVersionsProvider.getVersions().contains(version);
+    }
+
+
+    private String buildHelmTemplateCommand(String version, String chartPath) {
+        return "helm-v" + version + " " + TEMPLATE_OPTION + " " + chartPath;
+    }
+
+    private TemplateValidationResult runHelmTemplate(String helmCommand)
+        throws BashExecutionException {
+
+        LOGGER.debug("Command executions: {} ", helmCommand);
+        BashOutput chartTemplateResult = executor.execute(helmCommand);
+        LOGGER.debug("Status code: " + chartTemplateResult.getExitValue());
+        if (chartTemplateResult.getExitValue() != 0) {
+            List<String> renderingErrors = parseTemplateError(chartTemplateResult.getOutputLines());
+            return new TemplateValidationResult(false, renderingErrors);
+        }
+        return new TemplateValidationResult(true, Collections.emptyList());
+    }
+
+    private String buildHelmLintCommand(String version, String chartPath, boolean isStrictLint) {
+        String command = "helm-v" + version + " " + LINT_OPTION + " " + chartPath;
+        if (isStrictLint) {
+            return command + " --strict";
+        }
+        return command;
+    }
+
+    private LintValidationResult runHelmLint(String helmCommand) {
+        BashOutput chartLintResult = executor.execute(helmCommand);
+
+        List<String> lintErrors = parseLintError(chartLintResult.getOutputLines());
+        List<String> lintWarnings = parseWarningError(chartLintResult.getOutputLines());
+
+        boolean isSuccessExitStatus = isSuccessExitStatus(chartLintResult.getExitValue());
+
+        if (isInvalidWithoutStandardError(isSuccessExitStatus, lintErrors, lintWarnings)) {
+            return new LintValidationResult(INVALID_RESULT, chartLintResult.getOutputLines(), new ArrayList<>());
+        }
+
+        return new LintValidationResult(isSuccessExitStatus, lintErrors, lintWarnings);
+    }
+
+    private boolean isInvalidWithoutStandardError(boolean isValid, List<String> lintErrors, List<String> lintWarnings) {
+        return !isValid && lintErrors.isEmpty() && lintWarnings.isEmpty();
+    }
+
+    private boolean isSuccessExitStatus(int exitValue) {
+        return exitValue == 0;
+    }
+
+    private List<String> parseTemplateError(List<String> outputLines) {
+
+        return outputLines.stream()
+            .filter(s -> s.startsWith("Error:"))
+            .collect(Collectors.toList());
+    }
+
+    private List<String> parseWarningError(List<String> outputLines) {
+        return outputLines.stream()
+            .filter(s -> s.startsWith("[WARNING]"))
+            .collect(Collectors.toList());
+    }
+
+    private List<String> parseLintError(List<String> outputLines) {
+        return outputLines.stream()
+            .filter(s -> s.startsWith("[ERROR]") || s.startsWith("Error"))
+            .filter(this::isNotHelmSummaryMessage)
+            .collect(Collectors.toList());
+    }
+
+    private boolean isNotHelmSummaryMessage(String line) {
+        Pattern pattern = Pattern.compile(HELM_SUMMARY_MESSAGE_PATTERN);
+        return !pattern.matcher(line).matches();
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/BashExecutionException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/BashExecutionException.java
new file mode 100644
index 0000000..2d70d39
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/BashExecutionException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.exception;
+
+public class BashExecutionException extends RuntimeException {
+
+    public BashExecutionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/NotSupportedVersionException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/NotSupportedVersionException.java
new file mode 100644
index 0000000..753a08d
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/NotSupportedVersionException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.exception;
+
+public class NotSupportedVersionException extends RuntimeException {
+
+    public NotSupportedVersionException(String version) {
+        super("Version: " + version + " is not supported");
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/SaveFileException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/SaveFileException.java
new file mode 100644
index 0000000..cdb9079
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/exception/SaveFileException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.exception;
+
+public class SaveFileException extends RuntimeException {
+
+    public SaveFileException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/BashOutput.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/BashOutput.java
new file mode 100644
index 0000000..88942e5
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/BashOutput.java
@@ -0,0 +1,43 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.List;
+
+public class BashOutput {
+
+    private final int exitValue;
+
+    private final List<String> outputLines;
+
+    public BashOutput(int exitValue, List<String> outputLines) {
+        this.exitValue = exitValue;
+        this.outputLines = outputLines;
+    }
+
+    public int getExitValue() {
+        return exitValue;
+    }
+
+    public List<String> getOutputLines() {
+        return outputLines;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/LintValidationResult.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/LintValidationResult.java
new file mode 100644
index 0000000..09cbe36
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/LintValidationResult.java
@@ -0,0 +1,55 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.List;
+
+public class LintValidationResult {
+
+    private final boolean isValid;
+
+    private final List<String> lintErrors;
+    private final List<String> lintWarnings;
+
+    /**
+     * Validation result of linting a Helm chart.
+     * @param isValid flag indicating if chart is valid
+     * @param lintErrors list of errors occurred during linting
+     * @param lintWarnings list of warning occurred during linting
+     */
+    public LintValidationResult(boolean isValid, List<String> lintErrors, List<String> lintWarnings) {
+        this.isValid = isValid;
+        this.lintErrors = lintErrors;
+        this.lintWarnings = lintWarnings;
+    }
+
+    boolean isValid() {
+        return isValid;
+    }
+
+    List<String> getLintErrors() {
+        return lintErrors;
+    }
+
+    List<String> getLintWarnings() {
+        return lintWarnings;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/TemplateValidationResult.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/TemplateValidationResult.java
new file mode 100644
index 0000000..1ba20f9
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/TemplateValidationResult.java
@@ -0,0 +1,48 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.List;
+
+public class TemplateValidationResult {
+
+    private final boolean isDeployable;
+
+    private final List<String> renderErrors;
+
+    /**
+     * Validation result of templating a Helm chart.
+     * @param isDeployable flag indicating if chart can be templated
+     * @param renderErrors list of errors occurred during templating
+     */
+    public TemplateValidationResult(boolean isDeployable, List<String> renderErrors) {
+        this.isDeployable = isDeployable;
+        this.renderErrors = renderErrors;
+    }
+
+    boolean isDeployable() {
+        return isDeployable;
+    }
+
+    List<String> getRenderErrors() {
+        return renderErrors;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/ValidationResult.java b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/ValidationResult.java
new file mode 100644
index 0000000..bb4fccc
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/validation/model/ValidationResult.java
@@ -0,0 +1,98 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.validation.model;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Optional;
+
+public class ValidationResult {
+
+    private final Boolean isDeployable;
+    private final List<String> renderErrors;
+    private final Boolean isValid;
+    private final List<String> lintWarning;
+    private final List<String> lintError;
+    private final String versionUsed;
+
+
+    /**
+     * ValidationResult constructor when linting is enabled.
+     * @param templateValidationResult result of helm chart templating
+     * @param lintValidationResult result of helm chart linting
+     * @param versionUsed version of helm client used
+     */
+    public ValidationResult(
+        TemplateValidationResult templateValidationResult,
+        LintValidationResult lintValidationResult,
+        String versionUsed) {
+        this.isDeployable = templateValidationResult.isDeployable();
+        this.renderErrors = templateValidationResult.getRenderErrors();
+
+        this.isValid = lintValidationResult.isValid();
+        this.lintWarning = lintValidationResult.getLintWarnings();
+        this.lintError = lintValidationResult.getLintErrors();
+        this.versionUsed = versionUsed;
+    }
+
+    /**
+     * ValidationResult constructor when linting is disabled.
+     * @param templateValidationResult result of helm chart templating
+     * @param versionUsed version of helm client used
+     */
+    public ValidationResult(
+        TemplateValidationResult templateValidationResult, String versionUsed) {
+        this.isDeployable = templateValidationResult.isDeployable();
+        this.renderErrors = templateValidationResult.getRenderErrors();
+
+        this.isValid = null;
+        this.lintWarning = null;
+        this.lintError = null;
+        this.versionUsed = versionUsed;
+    }
+
+    public Boolean isDeployable() {
+        return isDeployable;
+    }
+
+    public List<String> getRenderErrors() {
+        return Optional.ofNullable(renderErrors)
+            .map(Collections::unmodifiableList).orElse(null);
+    }
+
+    public Boolean isValid() {
+        return isValid;
+    }
+
+    public List<String> getLintWarning() {
+        return Optional.ofNullable(lintWarning)
+            .map(Collections::unmodifiableList).orElse(null);
+    }
+
+    public List<String> getLintError() {
+        return Optional.ofNullable(lintError)
+            .map(Collections::unmodifiableList).orElse(null);
+    }
+
+    public String getVersionUsed() {
+        return versionUsed;
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReader.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReader.java
new file mode 100644
index 0000000..e5c1a2e
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ApiVersionsReader.java
@@ -0,0 +1,80 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.file.Path;
+import java.util.Optional;
+import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
+import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
+import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ApiVersionNotFoundException;
+import org.onap.sdc.helmvalidator.helm.versions.exception.ReadFileException;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ApiVersionsReader {
+
+    private static final int MAIN_CHART_DIR_DEPTH = 2;
+    private static final String API_VERSION_PREFIX = "apiVersion:";
+    private static final Path CHART_FILE_NAME = Path.of("Chart.yaml");
+
+    String readVersion(String chartPath) {
+        return tryReadVersionFromChart(chartPath)
+            .orElseThrow(ApiVersionNotFoundException::new);
+    }
+
+    private Optional<String> tryReadVersionFromChart(String chartPath) {
+        try (TarArchiveInputStream tarInput = new TarArchiveInputStream(
+            new GzipCompressorInputStream(new FileInputStream(chartPath)))) {
+            return readVersionFromChart(tarInput);
+        } catch (IOException e) {
+            throw new ReadFileException("Cannot read tar from path: " + chartPath, e);
+        }
+    }
+
+    private Optional<String> readVersionFromChart(TarArchiveInputStream tarInput) throws IOException {
+        TarArchiveEntry currentEntry;
+        while ((currentEntry = tarInput.getNextTarEntry()) != null) {
+            if (isMainChartYaml(currentEntry)) {
+                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(tarInput));
+                return bufferedReader.lines()
+                    .filter(chartLine -> chartLine.contains(API_VERSION_PREFIX))
+                    .map(apiVersionLine -> apiVersionLine.replaceAll(API_VERSION_PREFIX, ""))
+                    .map(String::trim)
+                    .findFirst();
+            }
+        }
+        return Optional.empty();
+    }
+
+    private boolean isMainChartYaml(TarArchiveEntry currentEntry) {
+        Path entryPath = Path.of(currentEntry.getName());
+        return currentEntry.isFile()
+            && CHART_FILE_NAME.equals(entryPath.getFileName())
+            && (entryPath.getNameCount() == MAIN_CHART_DIR_DEPTH);
+    }
+
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProvider.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProvider.java
new file mode 100644
index 0000000..b892a33
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/ChartBasedVersionProvider.java
@@ -0,0 +1,57 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import org.onap.sdc.helmvalidator.helm.versions.exception.NotSupportedApiVersionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ChartBasedVersionProvider {
+
+    private final SupportedVersionsProvider supportedVersionsProvider;
+    private final ApiVersionsReader apiVersionsReader;
+
+    @Autowired
+    public ChartBasedVersionProvider(
+        SupportedVersionsProvider supportedVersionsProvider,
+        ApiVersionsReader apiVersionsReader) {
+        this.supportedVersionsProvider = supportedVersionsProvider;
+        this.apiVersionsReader = apiVersionsReader;
+    }
+
+    public String getVersion(String chartPath) {
+        String apiVersion = apiVersionsReader.readVersion(chartPath);
+        return mapToChartVersion(apiVersion);
+    }
+
+    private String mapToChartVersion(String apiVersion) {
+        switch (apiVersion) {
+            case "v1":
+                return supportedVersionsProvider.getLatestVersion("2");
+            case "v2":
+                return supportedVersionsProvider.getLatestVersion("3");
+            default:
+                throw new NotSupportedApiVersionException("Cannot obtain Helm version from API version: " + apiVersion);
+        }
+    }
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProvider.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProvider.java
new file mode 100644
index 0000000..ff1cdde
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SupportedVersionsProvider.java
@@ -0,0 +1,65 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import org.onap.sdc.helmvalidator.helm.validation.exception.NotSupportedVersionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class SupportedVersionsProvider {
+
+    private final SystemEnvVersionsReader versionsReader;
+
+    @Autowired
+    public SupportedVersionsProvider(SystemEnvVersionsReader versionsReader) {
+        this.versionsReader = versionsReader;
+    }
+
+    /**
+     * Retrieves list of available Helm client versions.
+     *
+     * @return list of available Helm client versions
+     */
+    public List<String> getVersions() {
+        return versionsReader.readVersions().stream()
+            .filter(Predicate.not(String::isBlank))
+            .sorted(Comparator.reverseOrder())
+            .collect(Collectors.toList());
+    }
+
+    /**
+     * Retrieves latest available Helm client with given major version.
+     *
+     * @param helmMajorVersion major version of Helm client
+     * @return latest available Helm client with given major version
+     */
+    public String getLatestVersion(String helmMajorVersion) {
+        return getVersions().stream()
+            .filter(supportedVersion -> supportedVersion.startsWith(helmMajorVersion + "."))
+            .findFirst()
+            .orElseThrow(() -> new NotSupportedVersionException(helmMajorVersion));
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReader.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReader.java
new file mode 100644
index 0000000..8cccd2b
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/SystemEnvVersionsReader.java
@@ -0,0 +1,47 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Optional;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import org.springframework.stereotype.Service;
+
+@Service
+public class SystemEnvVersionsReader {
+
+    private static final String HELM_SUPPORTED_VERSIONS = "HELM_SUPPORTED_VERSIONS";
+    private static final String DELIMITER = ",";
+
+    List<String> readVersions() {
+        return Arrays.stream(getSupportedVersionsFromEnv()
+            .split(DELIMITER))
+            .filter(Predicate.not(String::isBlank))
+            .collect(Collectors.toList());
+    }
+
+    String getSupportedVersionsFromEnv() {
+        return Optional.ofNullable(System.getenv(HELM_SUPPORTED_VERSIONS))
+            .orElse("");
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ApiVersionNotFoundException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ApiVersionNotFoundException.java
new file mode 100644
index 0000000..fadcc2a
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ApiVersionNotFoundException.java
@@ -0,0 +1,29 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions.exception;
+
+public class ApiVersionNotFoundException extends RuntimeException {
+
+    public ApiVersionNotFoundException() {
+        super("Cannot find apiVersion value in a main chart");
+    }
+
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/NotSupportedApiVersionException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/NotSupportedApiVersionException.java
new file mode 100644
index 0000000..368f9f1
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/NotSupportedApiVersionException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions.exception;
+
+public class NotSupportedApiVersionException extends RuntimeException {
+
+    public NotSupportedApiVersionException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ReadFileException.java b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ReadFileException.java
new file mode 100644
index 0000000..a6a1ec4
--- /dev/null
+++ b/src/main/java/org/onap/sdc/helmvalidator/helm/versions/exception/ReadFileException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * SDC-HELM-VALIDATOR
+ * ================================================================================
+ * Copyright (C) 2021 Nokia. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.sdc.helmvalidator.helm.versions.exception;
+
+public class ReadFileException extends RuntimeException {
+
+    public ReadFileException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000..3fef31f
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1,4 @@
+logging.level.web="ERROR"
+spring.mvc.log-request-details=false
+app.config.charts-base-path=/charts
+spring.jackson.default-property-inclusion=NON_NULL