combined functions for cleaner code

dnsapi/dns_aws.sh

@@ -209,75 +209,33 @@ _use_container_role() {
 _use_instance_role() {
   # https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configuring-instance-metadata-service.html
   # https://aws.amazon.com/blogs/security/get-the-full-benefits-of-imdsv2-and-disable-imdsv1-across-your-aws-infrastructure/
-  _url="http://169.254.169.254/latest/meta-data/"
-  _response=$(curl --write-out "%{http_code}\n" -s -HEAD $_url)
-  _debug "_response" "$_response"
-  if [ "$_response" -eq "401" ]; then
-    _use_imdsv2_instance_role
-  else
-    _use_imdsv1_instance_role
-  fi
-}
-
-_use_imdsv2_instance_role() {
-  _request_token_url="http://169.254.169.254/latest/api/token"
-  _instance_role_url="http://169.254.169.254/latest/meta-data/iam"
-  _request_token="$(curl -s -X PUT "$_request_token_url" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600")"
-  _debug "_request_token" "$_request_token"
-  if [ -z "$_request_token" ]; then
+  _instance_role_name_url="http://169.254.169.254/latest/meta-data/iam/security-credentials/"
+  #_response=$(curl --write-out "%{http_code}\n" -s -HEAD $_url)
+  if _get "$_instance_role_name_url" true 1 | _head_n 1 | grep -Fq 401; then
+    _debug "Using IMDSv2"
+    _token_url="http://169.254.169.254/latest/api/token"
+    export _H1="X-aws-ec2-metadata-token-ttl-seconds: 21600"
+    _token="$(_post "" "$_token_url" "" "PUT")"
+    _debug "_token" "$_token"
+    if [ -z "$_token" ]; then
       _debug "Unable to fetch IMDSv2 token from instance metadata"
       return 1
     fi
-  _instance_role_name="$(curl -s -H "X-aws-ec2-metadata-token: $_request_token" http://169.254.169.254/latest/meta-data/iam/security-credentials/)"
-  _debug "_instance_role_name" "$_instance_role_name"
-  if [ -z "$_instance_role_name" ]; then
-    _debug "Unable to fetch instance role name from instance metadata"
-    return 1
+    export _H1="X-aws-ec2-metadata-token: $_token"
   fi
-  _use_metadata_imdsv2 "http://169.254.169.254/latest/meta-data/iam/security-credentials/$_instance_role_name" "$_request_token"
-}
 
-_use_metadata_imdsv2() {
-  _aws_creds="$(
-    curl -s -H "X-aws-ec2-metadata-token: $2" "$1" |
-      _normalizeJson |
-      tr '{,}' '\n' |
-      while read -r _line; do
-        _key="$(echo "${_line%%:*}" | tr -d '"')"
-        _value="${_line#*:}"
-        _debug3 "_key" "$_key"
-        _secure_debug3 "_value" "$_value"
-        case "$_key" in
-        AccessKeyId) echo "AWS_ACCESS_KEY_ID=$_value" ;;
-        SecretAccessKey) echo "AWS_SECRET_ACCESS_KEY=$_value" ;;
-        Token) echo "AWS_SESSION_TOKEN=$_value" ;;
-        esac
-      done |
-      paste -sd' ' -
-  )"
-  _secure_debug "_aws_creds" "$_aws_creds"
-
-  if [ -z "$_aws_creds" ]; then
-    return 1
-  fi
-
-  eval "$_aws_creds"
-  _using_role=true
-}
-
-_use_imdsv1_instance_role() {
-  _url="http://169.254.169.254/latest/meta-data/iam/security-credentials/"
-  _debug "_url" "$_url"
-  if ! _get "$_url" true 1 | _head_n 1 | grep -Fq 200; then
+  if ! _get "$_instance_role_name_url" true 1 | _head_n 1 | grep -Fq 200; then
     _debug "Unable to fetch IAM role from instance metadata"
     return 1
   fi
-  _aws_role=$(_get "$_url" "" 1)
-  _debug "_aws_role" "$_aws_role"
-  _use_metadata_imdsv1 "$_url$_aws_role"
+  _instance_role_name=$(_get "$_instance_role_name_url" "" 1)
+  _debug "_instance_role_name" "$_instance_role_name"
+
+  _use_metadata "$_instance_role_name_url$_instance_role_name" "$_token"
 }
 
-_use_metadata_imdsv1() {
+_use_metadata() {
+  export _H1="X-aws-ec2-metadata-token: $2"
   _aws_creds="$(
     _get "$1" "" 1 |
       _normalizeJson |