parse-config.sh

#!/bin/bash

log() {
  # UTC time
  TIME=$(date -u +"%FT%TZ")

  # $1 is the message to log passed as the first - and only - function paramter
  echo "time=\"${TIME}\" level=INFO msg=\"$1\""
}

load_dir() {
  # $1, the first parameter is the directory to load files from
  if [ -d $1 ]; then
    cd $1

    # For each file in the directory, append `{FILENAME}={FILEVALUE}'\n` to result string
    for FILENAME in *; do
      FILE_LINE_COUNT=$(wc -l <$FILENAME)
      
      # Make sure the directory is not empty AND that it's not multi-lined      
      if [[ "$FILENAME" != "*" && $(($FILE_LINE_COUNT > 1)) == 0 ]]; then
        # Replaces underscores with dots

        # $2, is wether ot not to remap `_` to `.` in the key
        KEY=$(echo "$FILENAME")
        if [ "$2" = true ]; then
          KEY=$(echo "$KEY" | tr '_' '.')
        fi

        # $3, is the numbers of characters to strip in front of the key
        KEY="${KEY:$3}"

        # TODO: remove when not needed - we use tag source instead
        # Removes the .terraform suffix if it exists
        if [[ "$KEY" == *".terraform" ]]; then
          KEY=${KEY%".terraform"}
        fi

        # TODO: remove when not needed - we use tag visibility instead
        # Removes the infrastructure.global. prefix if it exists
        if [[ "$KEY" == "infrastructure.global."* ]]; then
          KEY=${KEY#"infrastructure.global."}
        fi

        # Removes the infrastructure. prefix if it exists
        if [[ "$KEY" == "infrastructure."* ]]; then
          KEY=${KEY#"infrastructure."}
        fi

        # Removes the application.<anything>. prefix if it exists
        if [[ "$KEY" == application.*.* ]]; then
          KEY=${KEY#application.*.}
        fi

        log "source=$FILENAME destination=$KEY"
        
        VALUE=$(cat "$FILENAME")
        RESULT="$KEY=$VALUE"
        printf "%s\n" "$RESULT" >> $WORKDIR/application.properties
      fi
    done
  fi
}

# We have 3 directories to load env variables from:
#   1. $WORKDIR/aws-parameter-store
#   2. $WORKDIR/aws-secret

# For aws-parameter-store, we strip the first character since it's always a '_'
log "Loading AWS Parameter Store variables..."
load_dir "$WORKDIR/aws-parameter-store" true 1
log "Loaded AWS Parameter Store variables"

log "Loading AWS Secret variables..."
load_dir "$WORKDIR/aws-secret" true 0
log "Loaded AWS Secret variables"

log "Loading AWS Application Secret variables..."
load_dir "$WORKDIR/aws-secret-application" false 0
log "Loaded AWS Application Secret variables"

sort "$WORKDIR/application.properties" | uniq > "$WORKDIR/temp.properties" && mv "$WORKDIR/temp.properties" "$WORKDIR/application.properties"