An easy way to install PrivateBin in a secure method, seperating files that can be publicly accessible and one's that can't.

PrivateBin-setup.bash

#!/bin/bash
#
# An easy way to install PrivateBin in a secure method, seperating files that can be
# publicly accessible and ones that shouldn't be.
#
# NOTE:
#   This script requires root privileges to modify ownership of the files.
#
# Version: v1.0.0
# License: MIT License
#          Copyright (c) 2024 Hunter T. (StrangeRanger)
#
########################################################################################
####[ Global Variables ]################################################################


###
### [ Configurable Variables ]
###

# Directory for files that should be accessible from the web.
readonly C_PUBLIC_FILE_PATH="public"
# Directory for files that should NOT be accessible from the web.
readonly C_PRIVATE_FILE_PATH="private"
# Defines the path to the private files, to be specified in the 'index.php' file.
readonly C_DEFINED_PATH="../private/"
# Owner of files.
readonly C_FILE_OWNER="www-data"

###
### [ Non-Configurable Variables ]
###

readonly C_PRIVATE=("bin" "cfg" "data" "lib" "tpl" "tst" "vendor")
C_LATEST_RELEASE_URL=$(curl -s "https://api.github.com/repos/PrivateBin/PrivateBin/releases/latest" \
    | grep "tarball_url" | cut -d '"' -f 4)
readonly C_LATEST_RELEASE_URL

## Modify output text color.
C_YELLOW="$(printf '\033[1;33m')"
C_BLUE="$(printf '\033[0;34m')"
C_RED="$(printf '\033[1;31m')"
C_NC="$(printf '\033[0m')"
readonly C_YELLOW C_BLUE C_RED C_NC

## Short-hand colorized messages.
C_WARNING="${C_YELLOW}==>${C_NC} "
C_ERROR="${C_RED}ERROR:${C_NC} "
C_INFO="${C_BLUE}==>${C_NC} "
readonly C_WARNING C_ERROR C_INFO


####[ Functions ]#######################################################################


####
# Copy an item from the source to the destination.
#
# PARAMETERS:
#   - $1: src (Required)
#       - The source file or directory to copy.
#   - $2: dst (Required)
#       - The destination file or directory to copy to.
#   - $3: name (Required)
#       - The name of the file or directory being copied, used for error messages.
copy_item() {
    local src="$1"
    local dst="$2"
    local name="$3"

    if [[ -e "$src" ]]; then
        cp -r "$src" "$dst" || {
            echo "${C_ERROR}Failed to migrate '$name'"
            exit 1
        }
    fi
}

####
# Remove files that are no longer needed.
remove_files() {
    local files_to_remove=(
        "latest-release.tar.gz"
        "$C_PUBLIC_FILE_PATH.old"
        "$C_PRIVATE_FILE_PATH.old"
    )

    echo "${C_INFO}Cleaning up..."
    for file in "${files_to_remove[@]}"; do
        [[ -e $file ]] && rm -rf "$file"
    done
}

####
# Revert changes made by the script. This ensures that the script resets all changes in
# the event of an error or user interrupt.
revert_changes() {
    echo "${C_INFO}Reverting changes..."

    if [[ -d "$C_PUBLIC_FILE_PATH.old" && -d "$C_PRIVATE_FILE_PATH.old" ]]; then
        rm -rf "$C_PUBLIC_FILE_PATH"
        rm -rf "$C_PRIVATE_FILE_PATH"
        mv "$C_PUBLIC_FILE_PATH.old" "$C_PUBLIC_FILE_PATH"
        mv "$C_PRIVATE_FILE_PATH.old" "$C_PRIVATE_FILE_PATH"
    else
        [[ ! -d $C_PUBLIC_FILE_PATH ]] \
            && echo "${C_WARNING}'${C_PUBLIC_FILE_PATH}.old' directory not found"
        [[ ! -d $C_PRIVATE_FILE_PATH ]] \
            && echo "${C_WARNING}'${C_PRIVATE_FILE_PATH}.old' directory not found"
        echo "${C_WARNING}Not all directories were found, manual intervention required"
        exit 2
    fi
}

####
# Cleanly exit the script by providing appropriate messages and cleaning up any files.
#
# PARAMETERS:
#   - $1: exit_code (Required)
clean_exit() {
    local exit_code="$1"

    # Unset the EXIT trap to prevent re-entry.
    trap - EXIT

    case "$exit_code" in
        0)
            remove_files
            ;;
        1)
            echo ""
            revert_changes
            ;;
        2)
            echo -e "\n${C_INFO}Exiting without clean up..."
            ;;
        129)
            echo -e "\n${C_WARNING}Hangup signal detected (SIGHUP)"
            revert_changes
            ;;
        130)
            echo -e "\n${C_WARNING}User interrupt detected (SIGINT)"
            revert_changes
            ;;
        143)
            echo -e "\n${C_WARNING}Termination signal detected (SIGTERM)"
            revert_changes
            ;;
        *)
            echo -e "\n${C_WARNING}Exiting with code: $exit_code"
            revert_changes
            ;;
    esac

    echo "${C_INFO}Exiting..."
    exit "$exit_code"
}


####[ Trapping Logic ]##################################################################


trap 'clean_exit 129' SIGHUP
trap 'clean_exit 130' SIGINT
trap 'clean_exit 143' SIGTERM
trap 'clean_exit $?' EXIT


####[ Main ]############################################################################


(
    echo "${C_INFO}Backing up existing files..."
    if [[ -d $C_PUBLIC_FILE_PATH ]]; then
        mv "$C_PUBLIC_FILE_PATH" "$C_PUBLIC_FILE_PATH.old" || exit 1
    fi

    if [[ -d $C_PRIVATE_FILE_PATH ]]; then
        mv "$C_PRIVATE_FILE_PATH" "$C_PRIVATE_FILE_PATH.old" || exit 1
    fi

    mkdir "$C_PUBLIC_FILE_PATH" || exit 1
    mkdir "$C_PRIVATE_FILE_PATH" || exit 1
) || {
    echo "${C_ERROR}Failed to backup existing files"
    clean_exit 1
}

(
    echo "${C_INFO}Fetching latest release..."
    curl -L -o latest-release.tar.gz "$C_LATEST_RELEASE_URL" || exit 1
    tar -xzf latest-release.tar.gz --strip-components=1 -C "$C_PUBLIC_FILE_PATH" \
        || exit 1
) || {
    echo "${C_ERROR}Failed to fetch latest release"
    clean_exit 1
}

echo "${C_INFO}Moving files to private directory..."
for item in "${C_PRIVATE[@]}"; do
    if [[ -e "$C_PUBLIC_FILE_PATH/$item" ]]; then
        mv "$C_PUBLIC_FILE_PATH/$item" "$C_PRIVATE_FILE_PATH" || {
            echo "${C_ERROR}Failed to move '$item' to private directory"
            clean_exit 1
        }
    fi
done

echo "${C_INFO}Migrating files..."
copy_item "$C_PUBLIC_FILE_PATH.old/.htaccess" "$C_PUBLIC_FILE_PATH/" ".htaccess file"
copy_item "$C_PRIVATE_FILE_PATH.old/cfg/conf.php" "$C_PRIVATE_FILE_PATH/cfg/" "conf.php file"
copy_item "$C_PRIVATE_FILE_PATH.old/data" "$C_PRIVATE_FILE_PATH/" "data directory"

echo "${C_INFO}Correcting file permissions..."
sudo chown -R "$C_FILE_OWNER:$C_FILE_OWNER" "$C_PUBLIC_FILE_PATH" "$C_PRIVATE_FILE_PATH" \
    || echo "${C_WARNING}Failed to change file ownership, please do so manually"

echo "${C_INFO}Setting path to private files..."
sed -i "s/define('PATH', *'[^']*')/define('PATH', '${C_DEFINED_PATH//\//\\/}')/" \
    "$C_PUBLIC_FILE_PATH/index.php" || {
        echo "${C_ERROR}Failed to set path to private files, please do so manually"
    }