73 lines
2.0 KiB
Bash
Executable File
73 lines
2.0 KiB
Bash
Executable File
#!/bin/sh
|
|
# Copyleft https://git.k8s.astropenguin.net/penguin/s3-arch-utils
|
|
|
|
# ##
|
|
# Reference
|
|
# https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html
|
|
#
|
|
# Usage
|
|
# arch_download_aws4.sh path/in/bucket/key.ext
|
|
#
|
|
# Description
|
|
# Prints the contents of an object from s3 into stdout
|
|
#
|
|
# Env vars
|
|
# ARCH_S3_BUCKET_URL The bucket url, e.g. my-bucket.s3.us-west-004.backblazeb2.com
|
|
# ARCH_S3_AUTH In the format of ACCESS_KEY:SECRET_KEY
|
|
# #
|
|
|
|
_PATH="$1"
|
|
if [ -z "$_PATH" ]; then
|
|
echo "Object key is required"
|
|
exit 1
|
|
fi
|
|
|
|
if [ -z "$ARCH_S3_BUCKET_URL" ]; then
|
|
echo "Env ARCH_S3_BUCKET_URL is required"
|
|
exit 1
|
|
fi
|
|
|
|
BUCKET_NAME=$( echo -n $ARCH_S3_BUCKET_URL | cut -d'.' -f1 )
|
|
SERVICE=$( echo -n $ARCH_S3_BUCKET_URL | cut -d'.' -f2 )
|
|
REGION=$( echo -n $ARCH_S3_BUCKET_URL | cut -d'.' -f3 )
|
|
ACCESS_KEY=$( echo -n $ARCH_S3_AUTH | cut -d':' -f1 )
|
|
SECRET_KEY=$( echo -n $ARCH_S3_AUTH | cut -d':' -f2 )
|
|
|
|
BUCKET_URL=$ARCH_S3_BUCKET_URL
|
|
|
|
_DATE=$( date -u +"%Y%m%d" )
|
|
_DTIME=$( date -u +"%Y%m%dT%H%M%SZ" )
|
|
_HEADERS="host;x-amz-content-sha256;x-amz-date"
|
|
_SHA=$( echo -n "" | sha256sum | cut -d' ' -f1 )
|
|
|
|
# Canon Request
|
|
_C="GET"
|
|
_C="$_C\n/$_PATH"
|
|
_C="$_C\n" # no query strings here
|
|
_C="$_C\nhost:$BUCKET_URL"
|
|
_C="$_C\nx-amz-content-sha256:$_SHA"
|
|
_C="$_C\nx-amz-date:$_DTIME"
|
|
_C="$_C\n"
|
|
_C="$_C\n$_HEADERS"
|
|
_C="$_C\n$_SHA"
|
|
|
|
# String to Sign
|
|
_S="AWS4-HMAC-SHA256"
|
|
_S="$_S\n$_DTIME"
|
|
_S="$_S\n$_DATE/$REGION/$SERVICE/aws4_request"
|
|
_S="$_S\n$( echo -ne "$_C" | sha256sum | cut -d' ' -f1 )"
|
|
|
|
function _HMAC { echo -ne "$2" | openssl dgst -sha256 -hex -mac HMAC -macopt "$1" | cut -d' ' -f2; }
|
|
|
|
SIG=$( _HMAC "key:AWS4$SECRET_KEY" "$_DATE" )
|
|
SIG=$( _HMAC "hexkey:$SIG" "$REGION" )
|
|
SIG=$( _HMAC "hexkey:$SIG" "$SERVICE" )
|
|
SIG=$( _HMAC "hexkey:$SIG" "aws4_request" )
|
|
SIG=$( _HMAC "hexkey:$SIG" "$_S" )
|
|
|
|
curl -XGET \
|
|
-H "X-Amz-Date: $_DTIME" \
|
|
-H "X-Amz-Content-SHA256: $_SHA" \
|
|
-H "Authorization: AWS4-HMAC-SHA256 Credential=$ACCESS_KEY/$_DATE/$REGION/$SERVICE/aws4_request, SignedHeaders=$_HEADERS, Signature=$SIG" \
|
|
"https://$BUCKET_URL/$_PATH"
|