Assuming the following JSON:
{
"A":{
"A_KEY":"%PLACEHOLDER_1%",
"B_KEY":"%PLACEHOLDER_2%"
}
}
And, the following values.yaml:
placeholders:
PLACEHOLDER_1: Hello
PLACEHOLDER_2: WorldI would like to load this JSON using Configmap into my pod. But, replace the placeholders with the values under values.yaml automatically based on the key.
Thought about writing a simple regex which will search for the words between two % and use this word with .Values.placeholders.$1.
So far, I managed to replace single value using:
apiVersion: v1
kind: ConfigMap
metadata:
name: config
data:
config.json: |-
{{- regexReplaceAll "%PLACEHOLDER_1%" ( .Files.Get "config.json") .Values.placeholders.PLACEHOLDER_1 | nindent 4 }}The final goal is to replace both PLACEHOLDER_1 and PLACEHOLDER_2 by single regex.
desired JSON:
{
"A":{
"A_KEY":"Hello",
"B_KEY":"World"
}
}
Any help will be much appriciated.
Here is what I have come up with:
apiVersion: v1
kind: ConfigMap
metadata:
name: config
data:
config.json: |-
{{- $file := .Files.Get "config.json" }}
{{- range $k, $v := .Values.placeholders }}
{{- $file = regexReplaceAll (printf "%%%s%%" $k) $file $v }}
{{- end }}
{{- print $file | nindent 4 }}I load a config file content into a $file variable and then iterate over all placeholers.keys from values.yaml file and replace them one by one, saving the output back to the same variable. At the end, $file variable has all fields substituted so I just print it.