REST API 에 대한 내용을 그대로 옮겨쓴 bash script 다. 보면 알겠지만, 마지막에 GET/PUT 을 이용하여 s3 서비스를 이용하는 모습을 볼 수 있다.

#!/bin/bash 
# 

AWS_ACCESS_KEY_ID=8888
AWS_SECRET_ACCESS_KEY=8888

bucket="varrampi" 
region="ap-northeast-2" 
timestamp=$(date -u "+%Y-%m-%d %H:%M:%S") 
signed_headers="date;host;x-amz-acl;x-amz-content-sha256;x-amz-date" 
get_signed_headers="host" 

if [[ $(uname) == "Darwin" ]]; then 
    iso_timestamp=$(date -ujf "%Y-%m-%d %H:%M:%S" "${timestamp}" "+%Y%m%dT%H%M%SZ") 
    date_scope=$(date -ujf "%Y-%m-%d %H:%M:%S" "${timestamp}" "+%Y%m%d") 
    date_header=$(date -ujf "%Y-%m-%d %H:%M:%S" "${timestamp}" "+%a, %d %h %Y %T %Z") 
else 
    iso_timestamp=$(date -ud "${timestamp}" "+%Y%m%dT%H%M%SZ") 
    date_scope=$(date -ud "${timestamp}" "+%Y%m%d") 
    date_header=$(date -ud "${timestamp}" "+%a, %d %h %Y %T %Z") 
fi 

payload_hash() { 
    local output=$(shasum -ba 256 "$file") 
    echo "${output%% *}" 
} 

canonical_request() { 
    echo "PUT" 
    echo "/${prefix}/${file}" 
    echo "" 
    echo "date:${date_header}" 
    echo "host:${bucket}.s3.amazonaws.com" 
    echo "x-amz-acl:public-read" 
    echo "x-amz-content-sha256:$(payload_hash)" 
    echo "x-amz-date:${iso_timestamp}" 
    echo "" 
    echo "${signed_headers}" 
    printf "$(payload_hash)" 
} 

canonical_query_string() { 
    DATESTAMP=$(date -u +%Y%m%d) 
    CREDENTIAL_SCOPE="${DATESTAMP}/${region}/s3/aws4_request" 
    AMZ_DATE=$(date -u +%Y%m%dT%H%M%SZ) 
    ALGORITHM="AWS4-HMAC-SHA256" 
    CANONICAL_QUERYSTRING="X-Amz-Algorithm=${ALGORITHM}" 
    CANONICAL_QUERYSTRING="${CANONICAL_QUERYSTRING}&X-Amz-Credential=$(urlEncode "${AWS_ACCESS_KEY_ID}/${CREDENTIAL_SCOPE}")" 
    CANONICAL_QUERYSTRING="${CANONICAL_QUERYSTRING}&X-Amz-Date=${AMZ_DATE}" 
    CANONICAL_QUERYSTRING="${CANONICAL_QUERYSTRING}&X-Amz-Expires=${AMZ_EXPIRES}" 
    CANONICAL_QUERYSTRING="${CANONICAL_QUERYSTRING}&X-Amz-SignedHeaders=host" 

    echo "${CANONICAL_QUERYSTRING}" 
} 


QUERYSTRING="${canonical_query_string}" 
canonical_get_request() { 
    echo "GET" 
    echo "/acm.pdf" 
    echo "${QUERYSTRING}" 
    echo "${bucket}.s3.amazonaws.com" 
    echo "host" 
    printf "UNSIGNED-PAYLOAD"  
} 

GET_string_to_sign() { 
    echo "AWS4-HMAC-SHA256" 
    echo "${iso_timestamp}" 
    echo "${date_scope}/${region}/s3/aws4_request" 

    local output=$(canonical_get_request | shasum -a 256) 
    echo "${output%% *}" 
} 

PUT_string_to_sign() {  
    echo "AWS4-HMAC-SHA256" 
    echo "${iso_timestamp}" 
    echo "${date_scope}/${region}/s3/aws4_request" 
    local output=$(canonical_request | shasum -a 256) 
    printf "${output%% *}" 
} 

signature_key() { 
    local secret=$(printf "AWS4${AWS_SECRET_ACCESS_KEY?}" | hex_key) 
    local date_key=$(printf ${date_scope} | hmac_sha256 "${secret}" | hex_key) 
    local region_key=$(printf ${region} | hmac_sha256 "${date_key}" | hex_key) 
    local service_key=$(printf "s3" | hmac_sha256 "${region_key}" | hex_key) 
    printf "aws4_request" | hmac_sha256 "${service_key}" | hex_key 
} 

hex_key() { 
    xxd -p -c 256 
} 

hmac_sha256() { 
    local hexkey=$1 
    openssl dgst -binary -sha256 -mac HMAC -macopt hexkey:${hexkey} 
} 

GET_signature() { 
    GET_string_to_sign | hmac_sha256 $(signature_key) | hex_key | sed "s/^.* //" 
} 

signature() { 
    PUT_string_to_sign | hmac_sha256 $(signature_key) | hex_key | sed "s/^.* //" 
} 
PUT() { 
    file=$2 
    prefix=$1 
    curl \ 
        -T "${file}" \ 
        -H "Authorization: AWS4-HMAC-SHA256 Credential=${AWS_ACCESS_KEY_ID?}/${date_scope}/${region}/s3/aws4_request,SignedHeaders=${signed_headers},Signature=$(signature)" \ 
        -H "Date: ${date_header}" \ 
        -H "x-amz-acl: public-read" \ 
        -H "x-amz-content-sha256: $(payload_hash)" \ 
        -H "x-amz-date: ${iso_timestamp}" \ 
        "https://${bucket}.s3.amazonaws.com/${prefix}/${file}" 
} 

GET() { 
    curl -o newtestacm.pdf "http://${bucket}.s3.amazonaws.com/acm.pdf?${QUERYSTRING}&X-Amz-Signature=${GET_signature}" 
} 


#GET 

signature_key() { 
    local secret=$(printf "AWS4${AWS_SECRET_ACCESS_KEY?}" | hex_key) 
    local date_key=$(printf ${date_scope} | hmac_sha256 "${secret}" | hex_key) 
    local region_key=$(printf ${region} | hmac_sha256 "${date_key}" | hex_key) 
    local service_key=$(printf "s3" | hmac_sha256 "${region_key}" | hex_key) 
    printf "aws4_request" | hmac_sha256 "${service_key}" | hex_key 
} 

PUT_signature() { 
    string_to_sign | hmac_sha256 $(signature_key) | hex_key | sed "s/^.* //" 
} 

GET 
PUT dir100 main.cpp

편한곳에 s3common 으로 저장 후,

% chmod 777 s3common

실행시켜본다.

예상대로 잘 올라간 모습을 확인할 수 있다.