Create installer script for Debian/Ubuntu

I might add support for other distros/package managers later

install.sh

+#!/usr/bin/env bash
+
+# Grasscutter install script for linux
+# Made by TurtleIdiot
+
+# Stops the installer if any command has a non-zero exit status
+set -e
+
+# Checks for root
+if [ $EUID != 0 ]; then
+        echo "Please run the installer as root!"
+        exit
+fi
+
+is_command() {
+        # Checks if a given command is available
+        local check_command="$1"
+        command -v "${check_command}" > /dev/null 2>&1
+}
+
+# IP validation
+valid_ip() {
+        local ip=$1
+        local stat=1
+
+        if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+                OIFS=$IFS
+                IFS="."
+                ip=($ip)
+                IFS=$OIFS
+                [[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
+                        && ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
+                stat=$?
+        fi
+        return $stat
+}
+
+# Checks for supported installer(s) (only apt-get for now :(, might add pacman in the future)
+if is_command apt-get ; then
+        echo "Supported package manager found"
+else
+        echo "No supported package manager found"
+        exit
+fi
+
+INSTALLER_DEPS="curl wget openssl unzip git"
+GC_DEPS="mongodb openjdk-17-jre"
+
+echo "The following packages will have to be installed in order to INSTALL grasscutter:"
+echo -e "$INSTALLER_DEPS \n"
+echo "The following packages will have to be installed to RUN grasscutter:"
+echo -e "$GC_DEPS \n"
+
+echo "Do you wish to proceed and install grasscutter?"
+select yn in "Yes" "No" ; do
+        case $yn in
+                Yes ) break;;
+                No ) exit;;
+        esac
+done
+
+echo "Updating package cache..."
+apt-get update -qq > /dev/null
+
+# Starts installing dependencies
+echo "Installing setup dependencies..."
+apt-get -qq install $INSTALLER_DEPS -y > /dev/null
+echo "Done"
+
+echo "Installing grasscutter dependencies..."
+apt-get -qq install $GC_DEPS -y > /dev/null
+echo "Done"
+
+echo "Getting grasscutter..."
+
+# Download and rename jar
+wget -q --show-progress https://nightly.link/Grasscutters/Grasscutter/workflows/build/stable/Grasscutter.zip
+unzip -qq Grasscutter.zip
+mv $(find -name "grasscutter*.jar" -type f) grasscutter.jar
+
+# Download resources
+echo "Downloading resources... (this will take a moment)"
+wget -q --show-progress https://github.com/Koko-boya/Grasscutter_Resources/archive/refs/heads/main.zip -O resources.zip
+echo "Extracting..."
+unzip -qq resources.zip
+mv ./Grasscutter_Resources-main/Resources ./resources
+
+# Here we do a sparse checkout to only pull /data and /keys
+echo "Downloading keys and data..."
+mkdir repo
+cd repo
+git init -q
+git remote add origin https://github.com/Grasscutters/Grasscutter.git
+git fetch -q
+git config core.sparseCheckout true
+echo "data/" >> .git/info/sparse-checkout
+echo "keys/" >> .git/info/sparse-checkout
+git pull origin stable -q
+cd ../
+mv ./repo/data ./data
+mv ./repo/keys ./keys
+
+# Generate handbook/config
+echo "Please enter language when prompted (press enter/return to resume script)"
+read
+java -jar grasscutter.jar -handbook
+
+# Prompt IP address for config.json and for generating new keystore.p12 file
+echo "Please enter the IP address that will be used to connect to the server"
+echo "This can be a local or a public IP address"
+echo "This IP address will be used to generate SSL certificates so it is important it is correct"
+
+while : ; do
+        read -p "Enter IP: " SERVER_IP
+        if valid_ip $SERVER_IP; then
+                break;
+        else
+                echo "Invalid IP address. Try again."
+        fi
+done
+
+# Replaces "127.0.0.1" with given IP
+sed -i "s/127.0.0.1/$SERVER_IP/g" config.json
+
+# Generates new keystore.p12 with the server's IP address
+# This is done to prevent a "Connection Timed Out" error from appearing
+#       after clicking to enter the door in the main menu/title screen
+# This issue only exists when connecting to a server *other* than localhost
+#       since the default keystore.p12 has only been made for localhost
+
+mkdir certs
+cd certs
+echo "Generating CA key and certificate pair..."
+openssl req -x509 -nodes -days 25202 -newkey rsa:2048 -subj "/C=GB/ST=Essex/L=London/O=Grasscutters/OU=Grasscutters/CN=$SERVER_IP" -keyout CAkey.key -out CAcert.crt
+echo "Generating SSL key and certificate pair..."
+
+openssl genpkey -out ssl.key -algorithm rsa
+
+# Creates a conf file in order to generate a csr
+cat > csr.conf <<EOF
+[ req ]
+default_bits = 2048
+prompt = no
+default_md = sha256
+req_extensions = req_ext
+distinguished_name = dn
+
+[ dn ]
+C = GB
+ST = Essex
+L = London
+O = Grasscutters
+OU = Grasscutters
+CN = $SERVER_IP
+
+[ req_ext ]
+subjectAltName = @alt_names
+
+[ alt_names ]
+IP.1 = $SERVER_IP
+EOF
+
+# Creates csr using key and conf
+openssl req -new -key ssl.key -out ssl.csr -config csr.conf
+
+# Creates conf to finalise creation of certificate
+cat > cert.conf <<EOF
+
+authorityKeyIdentifier=keyid,issuer
+basicConstraints=CA:FALSE
+keyUsage = digitalSignature, nonRepudiation, keyEncipherment, keyAgreement, dataEncipherment
+subjectAltName = @alt_names
+
+[alt_names]
+IP.1 = $SERVER_IP
+
+EOF
+
+# Creates ssl cert
+openssl x509 -req -in ssl.csr -CA CAcert.crt -CAkey CAkey.key -CAcreateserial -out ssl.crt -days 25202 -sha256 -extfile cert.conf
+
+echo "Generating keystore.p12 from key and certificate..."
+openssl pkcs12 -export -out keystore.p12 -inkey ssl.key -in ssl.crt -certfile CAcert.crt -passout pass:123456
+
+cd ../
+mv ./certs/keystore.p12 ./keystore.p12
+echo "Done"
+
+echo "Asking Noelle to clean up..."
+rm -rf Grasscutter.zip resources.zip ./certs ./Grasscutter_Resources-main ./repo
+echo "All done!"
+echo -e "You can now uninstall the following packages if you wish:\n$INSTALLER_DEPS"
+echo "-=-=-=-=-=--- !! IMPORTANT !! ---=-=-=-=-=-"
+echo "Please make sure that ports 443 and 22102 are OPEN"
+echo -e "In order to run the server, run the following command:\nsudo java -jar grasscutter.jar"
+echo "You must run it using sudo as port 443 is a privileged port"
+echo "To play, use the IP you provided earlier ($SERVER_IP) via GrassClipper or Fiddler"
+
+exit