Created
December 19, 2022 15:44
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bash script for signed download from s3 bucket
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S3_SECRET="secret" | |
AWS_REGION="ap-southeast-1" | |
S3_BUCKET="s3-bucket" | |
S3_FOLDER="s3-folder" | |
TARGET_FILE="targetFile.txt" | |
FILE_PATH="/${S3_BUCKET}/${S3_FOLDER}/${TARGET_FILE}" | |
CONTENT_TYPE="text/plain" | |
DATE_VALUE=`date -R` | |
SIGN_STRING="GET\n\n${CONTENT_TYPE}\n${DATE_VALUE}\n${FILE_PATH}" | |
SIGN_HASH=`echo -en ${SIGN_STRING} | openssl dgst -sha1 -hmac ${S3_SECRET} -binary | base64` | |
curl \ | |
-H "Host: ${S3_BUCKET}.s3-${AWS_REGION}.amazonaws.com" \ | |
-H "Date: ${DATE_VALUE}" \ | |
-H "Content-Type: ${CONTENT_TYPE}" \ | |
-H "Authorization: AWS ${S3_KEY}:${SIGN_HASH}" \ | |
-o ${TARGET_FILE} \ | |
"https://${S3_BUCKET}.s3-${AWS_REGION}.amazonaws.com/${S3_FOLDER}/${TARGET_FILE}" | |
# simple handling when curl exit code is not 0 | |
CURL_OUTPUT=$? | |
if [[ $CURL_OUTPUT -ne 0 ]]; | |
then | |
echo "Encountered error when using curl to AWS S3." | |
exit 1 | |
fi |
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