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1. Extract legal_entity_id (client_id) from token. Take contract_request_id.
2. Check client_id=nhs_legal_entity_id (nhs_side) - in case of error return 403 Error ('Invalid client id')
3. Validate that contract_request hasn't been signed by  nhs_side already
   1. Check if status= 'PENDING_NHS_SIGNED'
   2. In case of error return 422 error ('The contract can't be signed by status')

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Decode content that is encrypted in an electronic digital signature.
Use Digital signature WS. Method checks digital signature and returns result.

Validations

Validate

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EDRPOU

1. Check that 

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1. EDRPOU in Certificate details exists and not empty
   1. in case of error return 422 error ('Invalid

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1. 1. EDRPOU in DS')
2. Check that 

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1. EDRPOU in Certificate details is equal to 

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1. EDRPOU in legal entity
   1. Get client_id from token.
   2. Find prm.legal_entities id by client_id
   3. Compare EDRPOU in Certificate with legal_entities.edrpou
   4. In case validation fails - generate 422 error
2. Get party.

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1. last_

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1. name using nhs_signer_id from contract_request

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1. 1. employees.employee_id=nhs_signer_id and client_id=employee.legal_entity_

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1. 1. id → party.last_name
      1. Convert

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1. 1. 1. prm.parties.LAST_NAME and Certificate details.SURNAME to uppercase
      2. Compare

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1. 1. 1. prm.parties.LAST_NAME and Certificate details.SURNAME as Cyrillic letters
   2. In case validation fails - generate 422 error

Check signed content

Check decoded signed content with previously created on IL.db.

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1. Validate request using JSON schema
   
   1. In case validation fails - generate 422 error
2. Check contract request status
   1. If status is not PENDING_NHS_SIGN - return error 422 'Incorrect status'
3. Validate contractor_divisions
   1. Check divisions belongs to legal_entity and divisions.status='active'
      1. in case of error return 422  error view $divisions ('Division must be active and within current legal_entity')
4. Validate contractor_employee_divisions
   1. Employees from employee_divisions has employee_type='DOCTOR', status='APPROVED'
      1. in case of error return 422  error view $employee ('Employee must be an active DOCTOR')
   2. Check contractor_employee_divisions.division_id is present in contractor_divisions.id
      1. in case of error return 422 error $divisions ('The division is not belong to contractor_divisions')
   3. Check contract_number is null
      1. in case of error return 422  error view $employee  ('Employee can't be updated via Contract Request')
5. Validate start_date
   1. start_date>now()
      1. in case of error return 422 error $start_date ('Start date must be greater than create date')
6. Check whether all id is resolved and valid. For
    - contractor_legal_entity_id and nhs_legal_entity_id in status='active' (prm.legal_entities)
    - contractor_owner_id and nhs_signer_id in status = 'APPROVED' (prm.employees)
7. Invoke service Get Printout Form by Contract Request ID and compare to $printout_content from request
   1. in case of error return 422 error $printout_content ('Invalid printout content')

Save signed contract to media storage

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After status is changed to NHS_SIGNED  save printout_content to db.contract_requests.printout_content by $contract_id

Update contract request

1. Change contract_request.status='NHS_SIGNED'
2. set nhs_signed_date=now()::date

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