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Dynamically load environment variables after webpack compiles JS using a bash script to replace the values
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#!/usr/bin/env bash | |
## Given env.js that looks something like | |
# | |
# const env = { | |
# application_env : '~REACT_ENV_REPLACE_JS_APPLICATION_ENV~', | |
# }; | |
# module.exports = env; | |
# And an environment variable of JS_APPLICATION_ENV=whateverItOughtToBe ... replace any occurrences on runtime (add to docker CMD) | |
# | |
#### | |
INPUT_DIRECTORY=$1 | |
APPLICABLE_ENV_VARS=$(printenv | grep "^JS_[a-zA-Z0-9\_+]*") | |
if [ ! -d ${INPUT_DIRECTORY} ]; then | |
echo >&2 "provided input directory not found." | |
exit 2 | |
fi | |
JS_INPUT_FILES=$(ls ${INPUT_DIRECTORY}/ | grep "^.*\.js$"); | |
INVALID_ENV_VAR=0 | |
for CURRENT_ENV_VAR in ${APPLICABLE_ENV_VARS}; do | |
CURRENT_ENV_VAR_VALUE=$(echo ${CURRENT_ENV_VAR} | cut -d "=" -f2) | |
if [[ ${CURRENT_ENV_VAR_VALUE} =~ [\$|] ]]; then | |
echo >&2 "${CURRENT_ENV_VAR} contains a \$ or a | (pipe) character. Please escape it!! No manipulations have occurred." | |
INVALID_ENV_VAR=1 | |
fi | |
done | |
if [ ${INVALID_ENV_VAR} -eq 1 ]; then | |
exit 2 | |
else | |
echo "Environment variable values look safe. Proceeding with manipulating compiled JS." | |
fi | |
for CURRENT_ENV_VAR in ${APPLICABLE_ENV_VARS}; do | |
CURRENT_ENV_VAR_VALUE=$(echo ${CURRENT_ENV_VAR} | cut -d "=" -f2) | |
if [[ ${CURRENT_ENV_VAR_VALUE} =~ [\$|] ]]; then | |
echo >&2 "${CURRENT_ENV_VAR} contains a \$ or a | (pipe) character. Please escape it. This environment variable will be skipped," | |
exit 2 | |
fi | |
CURRENT_ENV_VAR_KEY=$(echo ${CURRENT_ENV_VAR} | cut -d "=" -f1) | |
SEARCH_PATTERN="~REACT_ENV_REPLACE_${CURRENT_ENV_VAR_KEY}~" | |
echo "Searching for: ${SEARCH_PATTERN} and replacing with: ${CURRENT_ENV_VAR_VALUE}" | |
for JS_INPUT_FILE in ${JS_INPUT_FILES}; do | |
echo "Looking at: ${JS_INPUT_FILE}" | |
JS_OUTPUT_FILE="adsf.out" | |
COMMAND_TO_EXECUTE="sed -i \"s|${SEARCH_PATTERN}|${CURRENT_ENV_VAR_VALUE}|g\" ${INPUT_DIRECTORY}/${JS_INPUT_FILE}" | |
echo ${COMMAND_TO_EXECUTE} | |
COMMAND_OUTPUT=$(eval ${COMMAND_TO_EXECUTE}) | |
echo ${COMMAND_OUTPUT} | |
done | |
done |
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