Remove grep, awk, sed dependency, use bash and curl only

dns_scripts/dns_add_cloudflare

@@ -1,43 +1,44 @@
 #!/usr/bin/env bash
 
-email=""
-key=""
+# need to add your email address and key to cloudflare below
+email=''
+key=''
+
 fulldomain="$1"
 token="$2"
+API='https://api.cloudflare.com/client/v4/zones'
+AUTH=( -H "X-Auth-Email: $email" -H "X-Auth-Key: $key" -H "Content-Type: application/json" )
+
+# get a list of all domain names from cloudflare
+# If you have a lot, you may need add "&page=1&per_page=1000"
+resp=$(curl --silent "${AUTH[@]}" -X GET "$API?match=all&status=active")
+
+# treat all names with dot as domain names
+while read -d ' ' i; do
+  [[ $i =~ \"name\":\"([^\"]+\.[^\"]+)\" ]] && all_domains="${all_domains:+$all_domains }${BASH_REMATCH[1]}"
+done <<<${resp//[ ,\[\{\}\]]/ }
+
+[ -z "$all_domains" ] && { echo 'no active domains found on your cloudflare account'; exit 1; }
+
+# select right CF domain (longest one)
+domain=$fulldomain.
+while [[ "$domain" && ! "$all_domains" =~ "${domain%?}" ]]; do domain=${domain#*.}; done
+domain=${domain%?}
+
+[ -z "$domain" ] && { echo 'domain name not found on your cloudflare account'; exit 1; }
+
+resp=$(curl --silent "${AUTH[@]}" -X GET "$API?name=$domain&match=any&status=active")
+
+# select result section
+[[ "$resp" =~ \"result\"[^\{]*\{([^\{\}]*\{[^\{\}]*\}[^\{\}]*)+\} ]]
+resp="${BASH_REMATCH[0]%\}*}"; resp="${resp#*\{}"
+
+# remove subsections - leave only domain level
+while [[ "$resp" =~ (.*)[\[\{][^]\{\}[]*[\]\}](.*) ]]; do resp="${BASH_REMATCH[1]}${BASH_REMATCH[2]}"; done
+
+# must match - we ask for already verified domain
+[[ "${resp// }" =~ \"id\":\"([^\"]+)\" ]]
+domain_id=${BASH_REMATCH[1]}
 
-# get a list of all domain names from cloudflare.  If you have a lot, you may need
-# "status=active&page=1&per_page=1000&match=all" instead of just "match=all"
-all_domains=$(curl --silent -X GET "https://api.cloudflare.com/client/v4/zones?match=all" \
-  -H "X-Auth-Email: ${email}" -H "X-Auth-Key: ${key}" -H "Content-Type: application/json" \
-  | grep -o "\"name\":\"[^\"]*\"" | awk -F'"' '{print $4}')
-
-NumParts=$(echo "$fulldomain" | awk -F"." '{print NF}')
-
-i=1
-while [ $i -lt "$NumParts" ]; do
-  let parts=NumParts-i
-  testpart=$(echo  "$fulldomain" |awk -v n=$parts -F\. '{for (i=n; i<NF; i++) printf $i "."; printf $NF}')
-  res=$(echo "$all_domains" | grep -c "$testpart")
-  if [[ "$res" == "1" ]]; then
-    domain=$(echo "$all_domains" | grep "$testpart")
-    let i=NumParts
-  fi
-  let i=i+1
-done
-
-if [ -z "$domain" ]; then
-  echo "domain name can't be found on your cloudflare account"
-  exit 1
-fi
-
-txtname=$( echo "_acme-challenge.${fulldomain}" | sed "s/.${domain}//")
-
-response=$(curl --silent -X GET "https://api.cloudflare.com/client/v4/zones?name=${domain}&match=all" \
-  -H "X-Auth-Email: ${email}" -H "X-Auth-Key: ${key}" -H "Content-Type: application/json")
-
-domain_section=$(echo "$response" | awk -F"[}]" '{for(i=1;i<=NF;i++){if($i~/\"'"${domain}"'\"/){print $i}}}')
-domain_id=$(echo "$domain_section" | awk -F"[,:}]" '{for(i=1;i<=NF;i++){if($i~/\"'"id"'\"/){print $(i+1)}}}'| awk -F'"' '{print $2}')
-
-response=$(curl --silent -X POST "https://api.cloudflare.com/client/v4/zones/${domain_id}/dns_records" \
-  -H "X-Auth-Email: ${email}" -H "X-Auth-Key: ${key}" -H "Content-Type: application/json" \
-  --data "{\"type\":\"TXT\",\"name\":\"${txtname}\",\"content\":\"$token\",\"ttl\":300}")
+curl --silent "${AUTH[@]}" -X POST "$API/$domain_id/dns_records" \
+  --data "{\"type\":\"TXT\",\"name\":\"_acme-challenge.${fulldomain%.$domain}\",\"content\":\"$token\",\"ttl\":300}"