getting NoMethodError Undefined method in Ruby - ruby-on-rails

Question

getting NoMethodError Undefined method service_account_id under valid_restriction? method.
Can anybody check why am I getting this error?
If you have links to resolve this, that would be helpful too. Thanks.
Error:
ERROR:
<NoMethodError: undefined method `service_account_id' for #String:0x0000560784713130>
authentication_request.rb:19:in `valid_restriction?'
Code Snippet below:
module Authentication
module AuthnGcp
class DecodedToken
PROJECT_ID_TOKEN_CLAIM_NAME = "google/compute_engine/project_id"
INSTANCE_NAME_TOKEN_CLAIM_NAME = "google/compute_engine/instance_name"
SUB_TOKEN_CLAIM_NAME = "sub"
EMAIL_TOKEN_CLAIM_NAME = "email"
AUDIENCE_TOKEN_CLAIM_NAME = "aud"
attr_reader :project_id, :instance_name, :service_account_id, :service_account_email, :audience
def initialize(decoded_token_hash:, logger:)
#decoded_token_hash = decoded_token_hash
#logger = logger
initialize_required_claims
initialize_optional_claims
end
private
def initialize_required_claims
#audience = required_token_claim_value(AUDIENCE_TOKEN_CLAIM_NAME)
#service_account_id = required_token_claim_value(SUB_TOKEN_CLAIM_NAME)
end
def initialize_optional_claims
#service_account_email = optional_token_claim_value(EMAIL_TOKEN_CLAIM_NAME)
#project_id = optional_token_claim_value(PROJECT_ID_TOKEN_CLAIM_NAME)
#instance_name = optional_token_claim_value(INSTANCE_NAME_TOKEN_CLAIM_NAME)
end
def required_token_claim_value(required_token_claim)
required_token_claim_value = token_claim_value(required_token_claim)
if required_token_claim_value.nil? || required_token_claim_value.empty?
raise Errors::Authentication::Jwt::TokenClaimNotFoundOrEmpty, required_token_claim
end
log_claim_extracted_from_token(required_token_claim, required_token_claim_value)
required_token_claim_value
end
def optional_token_claim_value(optional_token_claim)
optional_token_claim_value = token_claim_value(optional_token_claim)
if optional_token_claim_value.nil? || optional_token_claim_value.empty?
optional_token_claim_value = nil
#logger.debug(LogMessages::Authentication::Jwt::OptionalTokenClaimNotFoundOrEmpty.new(optional_token_claim))
else
log_claim_extracted_from_token(optional_token_claim, optional_token_claim_value)
end
optional_token_claim_value
end
def token_claim_value(token_claim)
token_claim_path = token_claim.split('/')
#decoded_token_hash.dig(*token_claim_path)
end
def log_claim_extracted_from_token(token_claim, token_claim_value)
#logger.debug(
LogMessages::Authentication::Jwt::ExtractedClaimFromToken.new(
token_claim,
token_claim_value
)
)
end
end
end
end
==========================================================================
module Authentication
module AuthnGcp
# This class is responsible for retrieving the correct value from the GCP token
# of the requested attribute.
class AuthenticationRequest
def initialize(decoded_token:)
#decoded_token = decoded_token
end
def valid_restriction?(restriction)
token_value =
case restriction.name
when Restrictions::PROJECT_ID
#decoded_token.project_id
when Restrictions::INSTANCE_NAME
#decoded_token.instance_name
when Restrictions::SERVICE_ACCOUNT_ID
#decoded_token.service_account_id
when Restrictions::SERVICE_ACCOUNT_EMAIL
#decoded_token.service_account_email
end
raise Errors::Authentication::AuthnGcp::JwtTokenClaimIsMissing, restriction.name if token_value.blank?
token_value == restriction.value
end
end
end
end