adding comments from PR

x-pack/filebeat/docs/inputs/input-httpjson.asciidoc

@@ -205,6 +205,7 @@ Some built-in helper functions are provided to work with the input state inside
 - `div`: does the integer division of two integer values.
 - `hmac`: calculates the hmac signature of a list of strings concatenated together. Supports sha1 or sha256. Example `[[hmac "sha256" "secret" "string1" "string2" (formatDate (now) "RFC1123")]]`
 - `base64Encode`: Joins and base64 encodes all supplied strings. Example `[[base64Encode "string1" "string2"]]`
+- `base64EncodeNoPad`: Joins and base64 encodes all supplied strings without padding. Example `[[base64EncodeNoPad "string1" "string2"]]`
 
 In addition to the provided functions, any of the native functions for https://golang.org/pkg/time/#Time[`time.Time`], https://golang.org/pkg/net/http/#Header[`http.Header`], and https://golang.org/pkg/net/url/#Values[`url.Values`] types can be used on the corresponding objects. Examples: `[[(now).Day]]`, `[[.last_response.header.Get "key"]]`
 

x-pack/filebeat/input/httpjson/internal/v2/value_tpl.go

@@ -56,6 +56,7 @@ func (t *valueTpl) Unpack(in string) error {
  "div": div,
  "hmac": hmacString,
  "base64Encode": base64Encode,
+ "base64EncodeNoPad": base64EncodeNoPad,
  }).
  Delims(leftDelim, rightDelim).
  Parse(in)
@@ -254,6 +255,15 @@ func base64Encode(values ...string) string {
  return base64.StdEncoding.EncodeToString([]byte(data))
 }
 
+func base64EncodeNoPad(values ...string) string {
+ data := strings.Join(values, "")
+ if data == "" {
+ return ""
+ }
+
+ return base64.RawStdEncoding.EncodeToString([]byte(data))
+}
+
 func hmacString(hmacType string, hmacKey string, values ...string) string {
  data := strings.Join(values[:], "")
  if data == "" {