create md5 from sec group rule description in order to allow multiple…

[1david5]

… rules with the same port and different descriptions.

what

• This PR generates the md5 hash from the security group rule description when creating the rule map keys.

why

• This change prevents key map duplication when generating the security group rule map and there are rules with the same port and different descriptions. Example below:

main.tf

module "security_groups" {
  source = "github.com/cloudposse/terraform-aws-security-group"

  name        =  "sg_name"
  vpc_id      = "vpc-0000111122223333"
  rules       = [
        {
          type        = "ingress"
          from_port   = 22
          to_port     = 22
          protocol    = "tcp"
          cidr_blocks = ["10.10.0.0/16"]
          description = "Allow ssh from main office"
        },
        {
          type        = "ingress"
          from_port   = 22
          to_port     = 22
          protocol    = "tcp"
          cidr_blocks = ["192.168.0.0/24"]
          description = "Allow ssh from management VPC"
        },
        {
          type        = "egress"
          from_port   = 0
          to_port     = 65535
          protocol    = "all"
          cidr_blocks = ["0.0.0.0/0"]
          description = "Allow all outbound"
        }
      ]
  description = "sg_descrition"
}

ERROR

Error: Duplicate object key

  on .terraform/modules/security_groups/main.tf line 11, in locals:
   9:   rules = module.this.enabled && var.rules != null ? {
  10:     for rule in flatten(distinct(var.rules)) :
  11:     format("%s-%s-%s-%s-%s-%s-%s-%s-%s-%s",
  12:       rule.type,
  13:       rule.protocol,
  14:       rule.from_port,
  15:       rule.to_port,
  16:       lookup(rule, "cidr_blocks", null) == null ? "no_ipv4" : "ipv4",
  17:       lookup(rule, "ipv6_cidr_blocks", null) == null ? "no_ipv6" : "ipv6",
  18:       lookup(rule, "security_group_id", null) == null ? "no_ssg" : "ssg",
  19:       lookup(rule, "prefix_list_ids", null) == null ? "no_pli" : "pli",
  20:       lookup(rule, "self", null) == null ? "no_self" : "self",
  21:       lookup(rule, "description", null) == null ? "no_desc" : "desc"
  22:     ) => rule
  23:   } : {}
    |----------------
    | rule.from_port is 22
    | rule.protocol is "tcp"
    | rule.to_port is 22
    | rule.type is "ingress"

Two different items produced the key
"ingress-tcp-22-22-ipv4-no_ipv6-no_ssg-no_pli-no_self-desc" in this 'for'
expression. If duplicates are expected, use the ellipsis (...) after the value
expression to enable grouping by key.

references

[SweetOps]

/rebuild-readme

[SweetOps]

/test all