fix: added validation to CBR input (#492)

Author: aamadeuss

README.md

@@ -140,7 +140,7 @@ You need the following permissions to run this module.
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | <a name="input_access_tags"></a> [access\_tags](#input\_access\_tags) | The list of access tags associated with the Event Streams instance. | `list(string)` | `[]` | no |
-| <a name="input_cbr_rules"></a> [cbr\_rules](#input\_cbr\_rules) | The list of context-based restriction rules to create. | <pre>list(object({<br/>    description = string<br/>    account_id  = string<br/>    rule_contexts = list(object({<br/>      attributes = optional(list(object({<br/>        name  = string<br/>        value = string<br/>    }))) }))<br/>    enforcement_mode = string<br/>  }))</pre> | `[]` | no |
+| <a name="input_cbr_rules"></a> [cbr\_rules](#input\_cbr\_rules) | The context-based restrictions rule to create. Only one rule is allowed. | <pre>list(object({<br/>    description = string<br/>    account_id  = string<br/>    rule_contexts = list(object({<br/>      attributes = optional(list(object({<br/>        name  = string<br/>        value = string<br/>    }))) }))<br/>    enforcement_mode = string<br/>  }))</pre> | `[]` | no |
 | <a name="input_create_timeout"></a> [create\_timeout](#input\_create\_timeout) | The timeout value for creating an Event Streams instance. Specify `3h` for an Enterprise plan instance. Add 1 h for each level of non-default throughput. Add 30 min for each level of non-default storage size. | `string` | `"3h"` | no |
 | <a name="input_delete_timeout"></a> [delete\_timeout](#input\_delete\_timeout) | The timeout value for deleting an Event Streams instance. | `string` | `"15m"` | no |
 | <a name="input_es_name"></a> [es\_name](#input\_es\_name) | The name to give the Event Streams instance created by this module. | `string` | n/a | yes |

variables.tf

@@ -240,9 +240,13 @@ variable "cbr_rules" {
     }))) }))
     enforcement_mode = string
   }))
-  description = "The list of context-based restriction rules to create."
+  description = "The context-based restrictions rule to create. Only one rule is allowed."
   default     = []
   # Validation happens in the rule module
+  validation {
+    condition     = length(var.cbr_rules) <= 1
+    error_message = "Only one CBR rule is allowed."
+  }
 }
 
 variable "service_credential_names" {