script to download file from Amazon S3 bucket

Question

Trying to write script to download file from Amazon S3 bucket.

Having trouble with the example on the cURL site. The script below produces:

The request signature we calculated does not match the signature you provided. Check your key and signing method.

Appreciate any help.

#!/bin/sh 
file="filename.php"
bucket="my-bucket"
resource="/${bucket}/${file}"
contentType="text/html"
dateValue="`date +'%a, %d %b %Y %H:%M:%S %z'`"
stringToSign="GET\n\n${contentType}\n${dateValue}\n${resource}"
s3Key='ABCABCABCABCABCABCAB'
s3Secret='xyzxyzyxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzxyzx'
signature=`/bin/echo -en "$stringToSign" | openssl sha1 -hmac ${s3Secret} -      binary | base64`

curl -v -H "Host:lssngen-updates-east.s3.amazonaws.com" \
        -H "Date:${dateValue}" \
        -H "Content-Type:${contentType}" \
        -H "Authorization: AWS ${s3Key}:${signature}" \
        https://${bucket}.s3.amazonaws.com/${file}

Answer 1

I write this bash script to download file from s3 (I download compressed file, you can change contentType to download other types of file)

#!/bin/sh 
outputFile="Your_PATH"
amzFile="AMAZON_FILE_PATH"
bucket="YOUR_BUCKET"
resource="/${bucket}/${amzFile}"
contentType="application/x-compressed-tar"
dateValue=`date -R`
stringToSign="GET\n\n${contentType}\n${dateValue}\n${resource}"
s3Key="YOUR_S3_KEY"
s3Secret="YOUR_S3SECRET"
signature=`echo -en ${stringToSign} | openssl sha1 -hmac ${s3Secret} -binary | base64`

curl  -H "Host: ${bucket}.s3.amazonaws.com" \
     -H "Date: ${dateValue}" \
     -H "Content-Type: ${contentType}" \
     -H "Authorization: AWS ${s3Key}:${signature}" \
     https://${bucket}.s3.amazonaws.com/${amzFile} -o $outputFile