A script for downloading the AWS PHP SDK v2, stripping down to S3 functionality and then applying a custom namespace.

build-as3cf-aws2.sh

#!/usr/bin/env bash

set -e

if [ ! -d src/amazon-s3-and-cloudfront ]; then
    echo 'This script must be run from the repository root.'
    exit 1
fi

for PROG in composer find sed
do
	which ${PROG}
	if [ 0 -ne $? ]
	then
		echo "${PROG} not found in path."
		exit 1
	fi
done

REPO_ROOT=${PWD}
TMP_ROOT="${REPO_ROOT}/aws2-build"
TARGET_DIR="${REPO_ROOT}/src/amazon-s3-and-cloudfront/vendor/Aws2"

if [ -d ${TMP_ROOT} ]; then
    rm -rf ${TMP_ROOT}
fi;

mkdir ${TMP_ROOT}
cd ${TMP_ROOT}

function log_step() {
    echo
    echo
    echo ${1}
    echo
    echo
}

log_step "Install the latest v2 of the AWS SDK"
mkdir sdk
(
    cd sdk
    composer require aws/aws-sdk-php:^2.8 --no-update --no-interaction
    composer install --no-autoloader --prefer-dist --no-interaction --no-suggest

    # Delete everything from the SDK except for S3 and Common files.
    find vendor/aws/aws-sdk-php/src/Aws/ -type d -mindepth 1 -maxdepth 1 ! -name S3 ! -name Common -exec rm -rf {} +
    # Remove tests & docs
    find vendor -type d -iname tests -exec rm -rf {} +
    find vendor -type d -iname docs -exec rm -rf {} +
)

log_step "Install php-scoper for code prefixing"
mkdir scoper
(
    cd scoper
    composer require humbug/php-scoper:^0.5 --update-no-dev --no-interaction
)

log_step "Run the prefixer, adding our namespace prefix" # Prefixed files are written into the ./sdk_prefixed directory.
scoper/vendor/bin/php-scoper add-prefix --prefix="DeliciousBrains\\WP_Offload_S3\\Aws2\\" --output-dir=sdk_prefixed sdk/vendor/
(
    cd sdk_prefixed
    rm -rf composer

    # Set the locale to prevent sed errors from characters with different encoding.
    export LC_ALL=C
    # Perform regex search replace to clean up any missed replacements in string literals (1 literal backslash = 4 in the command)

    OS_NAME=`uname -s`
    if [ "Darwin" = "${OS_NAME}" ]
    then
		find . -name "*.php" -print0 | xargs -0 sed -i '' -E "s:'(Aws|Guzzle|Symfony)\\\\\\\\:'DeliciousBrains\\\\\\\\WP_Offload_S3\\\\\\\\Aws2\\\\\\\\\1\\\\\\\\:g"
    else
		find . -name "*.php" -print0 | xargs -0 sed -i'' -E "s:'(Aws|Guzzle|Symfony)\\\\\\\\:'DeliciousBrains\\\\\\\\WP_Offload_S3\\\\\\\\Aws2\\\\\\\\\1\\\\\\\\:g"
    fi

    # Generate a classmap-only Composer autoloader for the SDK files.
    echo '{ "autoload": { "classmap": [""] } }' > composer.json
    composer dump-autoload --classmap-authoritative --no-interaction
    rm composer.json

    if [ "Darwin" = "${OS_NAME}" ]
    then
		find . -name "*.php" -print0 | xargs -0 sed -i '' -E "s:(Composer\\\\Autoload):DeliciousBrains\\\\WP_Offload_S3\\\\Aws2\\\\\1:g"
    else
		find . -name "*.php" -print0 | xargs -0 sed -i'' -E "s:(Composer\\\\Autoload):DeliciousBrains\\\\WP_Offload_S3\\\\Aws2\\\\\1:g"
    fi
)

# Delete the target directory if it exists.
if [ -d ${TARGET_DIR} ]; then
    rm -rf ${TARGET_DIR}
fi

# Move the prefixed SDK files to the plugin's vendor directory where they are referenced.
mv sdk_prefixed ${TARGET_DIR}

# Clean up the temporary working directory.
rm -rf ${TMP_ROOT}

log_step "Done!"