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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright 2021 NOKIA
+
+.. _sdc_helm_validator:
+
+SDC Helm Validator
+==============================
+
+
+General information
+------------------------------
+
+This application can be used to validate CNF Helm charts using a Helm Client. It allows to select Helm version, which will be used to execute validation. 
+
+More information could be found in project repository, see :ref:`sdc_helm_validator_repository`.
+
+
+
+Offered API
+-----------
+
+.. Latest Open API model: :download:`OpenAPI.yaml <https://gerrit.onap.org/r/gitweb?p=sdc/sdc-helm-validator.git;a=blob_plain;f=OpenAPI.yaml;hb=refs/heads/master>`
+
+
+Latest Open API model: |sdc-helm-validator-open-api|_
+
+
+Validation
+----------
+Application executes two types of validation:
+
+* Deployable (basic validation) - verify correct chart rendering.  
+* Lint (optional) - verify syntax of charts, it can be turned on/off by request parameter.    
+
+**Request parameters:**
+
+* versionDesired - Helm Client version, which will be used to validation (list of supported versions can be received */versions* endpoint), available formats:
+   
+  - Semantic version [X.Y.Z] e.g 3.5.2 
+  - Major version [vX] - uses latest of available major version, e.g: v3 uses latest 3.Y.Z version. 
+
+* isLinted - turn on/off lint validation
+* isStrictLinted  - turn on/off strict lint - if lint validation detects any warning, it marks chart as invalid. 
+
+
+Example usage
+-------------
+
+**Supported versions** (/versions)
+Request:
+
+.. code-block:: bash
+
+  curl -X 'GET' \
+  'http://<host>:<port>/versions' \
+  -H 'accept: */*'
+
+E.g:
+
+.. code-block:: bash
+
+  curl -X 'GET' \
+  'http://localhost:8080/versions' \
+  -H 'accept: */*'
+
+Sample response: 
+
+.. code-block:: json
+   
+  {"versions": 
+  ["3.5.2",
+  "3.4.1",
+  "3.3.4"]}
+
+**Validation** (/validate)
+
+Request:
+
+.. code-block:: bash
+   
+  curl -X 'POST' \
+  'http://<HOST>:<PORT>/validate' \
+  -H 'accept: application/json' \
+  -H 'Content-Type: multipart/form-data' \
+  -F 'versionDesired=<Helm client version>' \
+  -F 'file=@<path to file in .tgz format>;type=application/x-compressed-tar' \
+  -F 'isLinted=true' \
+  -F 'isStrictLinted=true'
+
+E.g: 
+
+.. code-block:: bash
+   
+  curl -X 'POST' \
+  'http://localhost:8080/validate' \
+  -H 'accept: application/json' \
+  -H 'Content-Type: multipart/form-data' \
+  -F 'versionDesired=3.5.2' \
+  -F 'file=@correct-apiVersion-v2.tgz;type=application/x-compressed-tar' \
+  -F 'isLinted=true' \
+  -F 'isStrictLinted=true'
+
+Sample response:
+
+.. code-block:: json
+   
+  {
+  "renderErrors": [],
+  "lintWarning": [],
+  "lintError": [],
+  "versionUsed": "3.5.2",
+  "valid": true,
+  "deployable": true
+  }
+
+
+
+Usage within SDC
+----------------
+
+The Helm validator is triggered by the SDC onboarding BE in CNF package onboarding use-cases.
+
+
+.. _sdc_helm_validator_repository:
+
+Project repository
+------------------
+
+`SDC Helm Validator repository <https://gerrit.onap.org/r/admin/repos/sdc/sdc-helm-validator>`_