Added arch_delete_aws4.sh

arch_delete_aws4.sh

@@ -0,0 +1,72 @@
+#!/bin/sh
+# Copyleft https://git.k8s.astropenguin.net/penguin/s3-arch-utils
+
+# ##
+# Reference
+#   https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObject.html
+#
+# Usage
+#   arch_delete_aws4.sh path/in/bucket/filename.ext
+#
+# Description
+#   Delete an object from bucket for key: path/in/bucket/filename.ext
+#    * key must not contain special characters
+#
+# 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-date"
+_SHA=$( echo -n "" | sha256sum | cut -d' ' -f1 )
+
+# Canon Request
+_C="DELETE"
+_C="$_C\n/$_PATH"
+_C="$_C\n" # no query strings here
+_C="$_C\nhost:$BUCKET_URL"
+_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 -s -XDELETE \
+  -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"