[BUG] Quotes get incorrectly duplicated

[dmgonch]

Existing rule

No response

Description of the issue

An expression that includes string() wrapped into single quotes produces incorrect result. See the correct result produced by az deployment group create --what-if ... command.

Error messages

The result of running repro steps below is incorrect - single quotes withing debug property should not be duplicated:

debug       : A''{"B":5}''
debugLength : 12

Reproduction

Create bug.bicep:

var task = {
  name: 'task1'
  parameters: {
    B: 5
  }
}

var tasks = [
  {
    name: task.name
    parameters: {
      debug: 'A\'${string(task.parameters)}\''
      debugLength: length('A\'${string(task.parameters)}\'')
    }
  }
]

#disable-next-line BCP081 no-deployments-resources
resource taskDeployment 'Microsoft.Resources/deployments@2020-10-01' = {
  name: 'name'
  properties: {
    mode: 'Incremental'
    template: {
      '$schema': 'https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#'
      contentVersion: '1.0.0.0'
      resources: [
        {
          apiVersion: '2019-12-01'
          type: 'Microsoft.ManagedIdentity/userAssignedIdentities'
          name: 'test'
          properties: {
            tasks: tasks
          }
        }
      ]
    }
  }
}

From powershell run:

az bicep build --file bug.bicep; Export-AzRuleTemplateData -TemplateFile bug.json -OutputPath bug-export.json; (Get-Content -Raw bug-export.json | ConvertFrom-Json | Where-Object { $_.type -eq 'Microsoft.ManagedIdentity/userAssignedIdentities' }).properties.tasks.parameters

Running az deployment group create --what-if -x Ignore --subscription <SUB-ID> -g <RG-NAME> -f bug.bicep produces the expected result:

          parameters.debug:       "A'{"B":5}'"
          parameters.debugLength: 10

Version of PSRule

2.9.0

Version of PSRule for Azure

1.31.3

Additional context

Name                           Value
----                           -----
PSVersion                      7.3.4
PSEdition                      Core
GitCommitId                    7.3.4
OS                             Linux 5.10.102.1-microsoft-standard-WSL2 #1 SMP Wed Mar 2 00:30:59 UTC 2022
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

[BernieWhite]

Thanks for reporting the issue @dmgonch.