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Allow external log bucket in different region #318

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Allow external log bucket in different region #318

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16 changes: 3 additions & 13 deletions bucket.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -5,26 +5,16 @@
locals {
use_external_bucket = var.use_external_audit_log_bucket

audit_log_bucket_id = local.use_external_bucket ? data.aws_s3_bucket.external[0].id : module.audit_log_bucket[0].this_bucket.id
audit_log_bucket_arn = local.use_external_bucket ? data.aws_s3_bucket.external[0].arn : module.audit_log_bucket[0].this_bucket.arn
audit_log_bucket_id = local.use_external_bucket ? var.audit_log_bucket_id : module.audit_log_bucket[0].this_bucket.id
audit_log_bucket_arn = local.use_external_bucket ? var.audit_log_bucket_arn : module.audit_log_bucket[0].this_bucket.arn

audit_log_cloudtrail_destination = join("/", [local.audit_log_bucket_arn, trim(var.cloudtrail_s3_key_prefix, "/")])
audit_log_config_destination = join("/", [local.audit_log_bucket_arn, trim(var.config_s3_bucket_key_prefix, "/")])
audit_log_flow_logs_destination = join("/", [local.audit_log_bucket_arn, trim(var.vpc_flow_logs_s3_key_prefix, "/")])
}

# --------------------------------------------------------------------------------------------------
# Case 1. Use the external S3 bucket.
# --------------------------------------------------------------------------------------------------

data "aws_s3_bucket" "external" {
count = local.use_external_bucket ? 1 : 0

bucket = var.audit_log_bucket_name
}

# --------------------------------------------------------------------------------------------------
# Case 2. Create a new S3 bucket.
# If local.use_external_bucket = false, then create a bucket for audit logs
#
# Create a S3 bucket to store various audit logs.
# Bucket policies are derived from the default bucket policy and official AWS documents.
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12 changes: 12 additions & 0 deletions variables.tf
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Expand Up @@ -115,6 +115,18 @@ variable "use_external_audit_log_bucket" {
default = false
}

variable "audit_log_bucket_id" {
description = "The id of the S3 bucket to store various audit logs."
type = string
default = null
}

variable "audit_log_bucket_arn" {
description = "The arn of the S3 bucket to store various audit logs."
type = string
default = null
}

# --------------------------------------------------------------------------------------------------
# Variables for iam-baseline module.
# --------------------------------------------------------------------------------------------------
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