#!/bin/bash

if [[ "$1" == 'remove' ]]; then
    echo 'Removing Epicyon i2p instance'
    systemctl stop i2pd
    if [ -f /var/lib/i2pd/tunnels.d/epicyon ]; then
	rm /var/lib/i2pd/tunnels.d/epicyon
    fi
    if [ -f /etc/i2pd/tunnels.conf.d/epicyon ]; then
	rm /etc/i2pd/tunnels.conf.d/epicyon
    fi
    rm /var/lib/i2pd/epicyon.dat
    systemctl restart i2pd

    systemctl stop epicyon
    systemctl disable epicyon
    rm /etc/nginx/sites-enabled/epicyon
    rm /etc/nginx/sites-availale/epicyon
    rm -rf /opt/epicyon
    if [ -d /var/www/cache ]; then
	rm -rf /var/www/cache
    fi
    if [ -d /srv/http/cache ]; then
	rm -rf /srv/http/cache
    fi
    echo 'Epicyon i2p instance removed'
    exit 0
fi

if [[ "$1" == 'removei2p' ]]; then
    if [ -f /usr/bin/pacman ]; then
	pacman -R --noconfirm i2pd
    else
	apt-get -y remove --purge i2pd
    fi
    rm -rf /etc/i2pd
    rm -rf /var/lib/i2pd
    if [ -f /var/log/i2pd/i2pd.log ]; then
	rm /var/log/i2pd/i2pd.log
    fi
fi

clear
echo 'Installing Epicyon on an i2p domain'

username='epicyon'
NGINX_PORT=9552
EPICYON_PORT=7156
tunnels_dir=/var/lib/i2pd/tunnels.d

echo 'Adding Epicyon dependencies'
if [ -f /usr/bin/pacman ]; then
    pacman -Syy
    pacman -S --noconfirm python-pip python-pysocks python-pycryptodome \
           imagemagick python-pillow python-requests \
	   perl-image-exiftool python-numpy python-dateutil \
	   certbot flake8 git i2pd
    pip3 install pyLD
else
    apt-get update
    apt-get -y install imagemagick python3-crypto python3-cryptodome \
	    python3-dateutil python3-idna python3-requests \
	    python3-numpy python3-pil.imagetk python3-pip \
	    python3-setuptools python3-socks python3-idna \
	    libimage-exiftool-perl python3-flake8 python3-pyld \
	    nginx git i2pd
fi

echo 'Cloning the epicyon repo'
if [ ! -d /opt/epicyon ]; then
    git clone https://gitlab.com/bashrc2/epicyon /opt/epicyon

    if [ ! -d /opt/epicyon ]; then
	echo 'Epicyon repo failed to clone'
	exit 3
    fi
fi

echo 'Adding an epicyon system user account'
if [ -f /usr/bin/pacman ]; then
    groupadd epicyon
    useradd --system -g epicyon --home-dir=/opt/epicyon $username
    groupadd www-data
    useradd --system -g www-data --home-dir=/srv/http www-data
else
    adduser --system --home=/opt/epicyon --group $username
fi

chown -R epicyon:epicyon /opt/epicyon

echo 'Creating a command script to obtain i2p domain names from dat files'
{ echo '#!/usr/bin/env python3';
  echo 'import base64, hashlib, sys';
  echo "with open(sys.argv[1], 'rb') as f:";
  echo '    isRead=False';
  echo '    try:';
  echo "        print(base64.b32encode(hashlib.sha256(base64.b64decode(f.read(), '-~')).digest()).decode().strip('=').lower()+\".b32.i2p\")";
  echo '        isRead=True';
  echo '    except:';
  echo '        pass';
  echo '    if not isRead:';
  echo "        print(base64.b32encode(hashlib.sha256(base64.b64decode(f.read(516), '-~')).digest()).decode().strip('=').lower()+\".b32.i2p\")"; } > /usr/bin/i2pdomain
chmod +x /usr/bin/i2pdomain

echo 'Creating Epicyon i2p tunnel file'
if [ ! -d "$tunnels_dir" ]; then
    ln -s /etc/i2pd/tunnels.conf.d /var/lib/i2pd/tunnels.d
fi

if ! grep -q 'epicyon.dat' /var/lib/i2pd/tunnels.conf; then
    { echo '';
      echo '[epicyon]';
      echo 'type = http';
      echo 'host = 127.0.0.1';
      echo 'inport = 80';
      echo "port = ${NGINX_PORT}";
      echo 'destination = epicyon.i2p';
      echo 'inbound.length = 1';
      echo 'inbound.quantity = 5';
      echo 'outbound.length = 1';
      echo 'outbound.quantity = 5';
      echo "keys = epicyon.dat"; } >> /var/lib/i2pd/tunnels.conf
fi
rm "$tunnels_dir"/*~

echo 'Setting i2p tunnels directory'
sed -i 's|#tunnelsdir =|tunnelsdir =|g' /etc/i2pd/i2pd.conf
sed -i 's|# tunnelsdir =|tunnelsdir =|g' /etc/i2pd/i2pd.conf
sed -i "s|tunnelsdir =.*|tunnelsdir = $tunnels_dir|g" /etc/i2pd/i2pd.conf

echo 'Enabling ipv6'
if [ -f /etc/sysctl.conf ]; then
    if grep -q 'net.ipv6.conf.all.disable_ipv6' /etc/sysctl.conf; then
	sed -i 's|net.ipv6.conf.all.disable_ipv6.*|net.ipv6.conf.all.disable_ipv6 = 0|g' /etc/sysctl.conf
	/sbin/sysctl -p -q
    fi
fi
sed -i 's|#ipv6 =|ipv6 =|g' /etc/i2pd/i2pd.conf
sed -i 's|# ipv6 =|ipv6 =|g' /etc/i2pd/i2pd.conf
sed -i 's|ipv6 =.*|ipv6 = false|g' /etc/i2pd/i2pd.conf

echo 'Disabling i2p logging'
#sed -i 's|#logfile =|logfile =|g' /etc/i2pd/i2pd.conf
#sed -i 's|# logfile =|logfile =|g' /etc/i2pd/i2pd.conf
#sed -i 's|logfile =.*|logfile = /dev/null|g' /etc/i2pd/i2pd.conf

echo 'Enabling i2p NAT traversal'
sed -i 's|#nat =|nat =|g' /etc/i2pd/i2pd.conf
sed -i 's|# nat =|nat =|g' /etc/i2pd/i2pd.conf
sed -i 's|nat =.*|nat = true|g' /etc/i2pd/i2pd.conf

if [ ! -d /run/i2pd ]; then
    mkdir /run/i2pd    
fi
chown -R i2pd:i2pd /run/i2pd

#if [ -f /usr/bin/pacman ]; then
#    sed -i 's|ExecStart=.*|ExecStart=/usr/sbin/i2pd --conf=/etc/i2pd/i2pd.conf --tunconf=/etc/i2pd/tunnels.conf --tunnelsdir=/etc/i2pd/tunnels.conf.d --service|g' /lib/systemd/system/i2pd.service
#    sed -i 's|Type=.*|Type=simple|g' /lib/systemd/system/i2pd.service
#fi

echo 'Setting file permissions'
chown -R i2pd:i2pd "$tunnels_dir"
chmod 644 "$tunnels_dir"/*
chmod 755 "$tunnels_dir"
# chown -R i2pd:i2pd /etc/i2pd
systemctl daemon-reload
systemctl enable i2pd
systemctl restart i2pd

echo 'Waiting for i2p daemon restart'
sleep 5
if [ ! -f /var/lib/i2pd/epicyon.dat ]; then
    echo 'Waiting for i2p daemon restart...'
    sleep 5
fi

if [ ! -f /var/lib/i2pd/epicyon.dat ]; then
    echo '/var/lib/i2pd/epicyon.dat not created'
    exit 6
fi

echo '/var/lib/i2pd/epicyon.dat file was created'

I2P_DOMAIN=$(i2pdomain /var/lib/i2pd/epicyon.dat)
if [[ "$I2P_DOMAIN" != *'.i2p' ]]; then
    echo 'Epicyon i2p domain not created'
    echo "$I2P_DOMAIN"
    exit 1
fi

echo "i2p domain: http://${I2P_DOMAIN}"

echo 'Creating Epicyon daemon'
{ echo '[Unit]';
  echo "Description=$username";
  echo 'After=syslog.target';
  echo 'After=network.target';
  echo '';
  echo '[Service]';
  echo 'Type=simple';
  echo "User=$username";
  echo "Group=$username";
  echo 'WorkingDirectory=/opt/epicyon';
  echo "ExecStart=/usr/bin/python3 /opt/epicyon/epicyon.py --http --i2p --port 80 --proxy ${EPICYON_PORT} --domain ${I2P_DOMAIN} --registration open";
  echo "Environment=USER=$username";
  echo 'Environment=PYTHONUNBUFFERED=true';
  echo 'Restart=always';
  echo 'StandardError=syslog';
  echo '';
  echo '[Install]';
  echo 'WantedBy=multi-user.target'; } > /etc/systemd/system/epicyon.service

systemctl daemon-reload
systemctl enable epicyon
systemctl restart epicyon

echo 'Creating nginx configuration'
if [ ! -f /etc/nginx/nginx.conf ]; then
    { echo 'user www-data;';
      echo 'pid /run/nginx.pid;';
      echo '';
      echo 'events {';
      echo '        worker_connections 50;';
      echo '        # multi_accept on;';
      echo '}';
      echo '';
      echo 'http {';
      echo '        # limit the number of connections per single IP';
      echo "        limit_conn_zone \$binary_remote_addr zone=conn_limit_per_ip:10m;";
      echo '';
      echo '        # limit the number of requests for a given session';
      echo "        limit_req_zone \$binary_remote_addr zone=req_limit_per_ip:10m rate=140r/s;";
      echo '';
      echo '        # if the request body size is more than the buffer size, then the entire (or partial) request body is written into a temporary file';
      echo '        client_body_buffer_size  128k;';
      echo '';
      echo '        # headerbuffer size for the request header from client, its set for testing purpose';
      echo '        client_header_buffer_size 3m;';
      echo '';
      echo '        # maximum number and size of buffers for large headers to read from client request';
      echo '        large_client_header_buffers 4 256k;';
      echo '';
      echo '        # read timeout for the request body from client, its set for testing purpose';
      echo '        client_body_timeout   3m;';
      echo '';
      echo '        # how long to wait for the client to send a request header, its set for testing purpose';
      echo '        client_header_timeout 3m;';
      echo '';
      echo '        sendfile on;';
      echo '        tcp_nopush on;';
      echo '        tcp_nodelay on;';
      echo '        keepalive_timeout 65;';
      echo '        types_hash_max_size 2048;';
      echo '        server_tokens off;';
      echo '';
      echo '        include /etc/nginx/mime.types;';
      echo '        default_type application/octet-stream;';
      echo '';
      echo '        access_log /dev/null;';
      echo '        error_log /dev/null;';
      echo '';
      echo '        gzip on;';
      echo '        gzip_disable "msie6";';
      echo '';
      echo '        include /etc/nginx/conf.d/*.conf;';
      echo '        include /etc/nginx/sites-enabled/*;';
      echo '}'; } > /etc/nginx/nginx.conf
else
    if ! grep -q 'include /etc/nginx/sites-enabled' /etc/nginx/nginx.conf; then
	echo 'include /etc/nginx/sites-enabled/*.conf;' >> /etc/nginx/nginx.conf
    fi
fi
if [ ! -d /etc/nginx/conf.d ]; then
    mkdir /etc/nginx/conf.d
fi
if [ ! -d /etc/nginx/sites-available ]; then
    mkdir /etc/nginx/sites-available
fi
if [ ! -d /etc/nginx/sites-enabled ]; then
    mkdir /etc/nginx/sites-enabled
fi

if [ -f /usr/bin/pacman ]; then
    if [ ! -f /lib/systemd/system/nginx.service ]; then
	echo 'Creating nginx daemon'
	{ echo '[Unit]';
	  echo 'Description=A high performance web server and a reverse proxy server';
	  echo 'Documentation=man:nginx(8)';
	  echo 'After=network.target nss-lookup.target';
	  echo ''
	  echo '[Service]';
	  echo 'Type=forking';
	  echo 'PIDFile=/run/nginx.pid';
	  echo "ExecStartPre=$(which nginx) -t -q -g 'daemon on; master_process on;'";
	  echo "ExecStart=$(which nginx) -g 'daemon on; master_process on;'";
	  echo "ExecReload=$(which nginx) -g 'daemon on; master_process on;' -s reload";
	  echo 'ExecStop=-/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid';
	  echo 'TimeoutStopSec=5';
	  echo 'KillMode=mixed';
	  echo '';
	  echo '[Install]';
	  echo 'WantedBy=multi-user.target'; } > /etc/systemd/system/nginx.service
	systemctl enable nginx
    fi
fi

web_dir=/var/www
if [ -f /usr/bin/pacman ]; then
    web_dir=/srv/http
fi
if [ ! -d ${web_dir}/cache ]; then
    mkdir ${web_dir}/cache
fi

echo "Creating nginx virtual host for http://${I2P_DOMAIN}"
{ echo "proxy_cache_path ${web_dir}/cache levels=1:2 keys_zone=my_cache:10m max_size=10g";
  echo '                 inactive=60m use_temp_path=off;'
  echo '';
  echo 'server {';
  echo "    listen 127.0.0.1:${NGINX_PORT} default_server;";
  echo "    server_name ${I2P_DOMAIN};"
  echo '';
  echo '    gzip            on;';
  echo '    gzip_min_length 1000;';
  echo '    gzip_proxied    expired no-cache no-store private auth;';
  echo '    gzip_types      text/plain application/xml;';
  echo '';
  echo '    add_header X-Content-Type-Options nosniff;';
  echo '    add_header X-XSS-Protection "1; mode=block";';
  echo '    add_header X-Download-Options noopen;';
  echo '    add_header X-Permitted-Cross-Domain-Policies none;';
  echo '';
  echo '    access_log /dev/null;';
  echo '    error_log /dev/null;';
  echo '';
  echo '    index index.html;';
  echo '    location / {';
  echo '        proxy_http_version 1.1;';
  echo '        client_max_body_size 31M;';
  echo "        proxy_set_header Upgrade \$http_upgrade;";
  echo '        proxy_set_header Connection "upgrade";';
  echo "        proxy_set_header Host \$http_host;";
  echo "        proxy_set_header X-Real-IP \$remote_addr;";
  echo "        proxy_set_header X-Forward-For \$proxy_add_x_forwarded_for;";
  echo '        proxy_set_header X-Forward-Proto http;';
  echo '        proxy_set_header X-Nginx-Proxy true;';
  echo '        expires epoch;';
  echo '        proxy_no_cache 1;';
  echo '        proxy_temp_file_write_size 64k;';
  echo '        proxy_connect_timeout 10080s;';
  echo '        proxy_send_timeout 10080;';
  echo '        proxy_read_timeout 10080;';
  echo '        proxy_buffer_size 64k;';
  echo '        proxy_buffers 16 32k;';
  echo '        proxy_busy_buffers_size 64k;';
  echo '        proxy_redirect off;';
  echo '        proxy_request_buffering off;';
  echo '        proxy_buffering on;';
  echo '        proxy_cache my_cache;';
  echo '        proxy_cache_use_stale error timeout http_500 http_502 http_503 http_504;';
  echo "        location ~ ^/(icons|images|media|emoji)/(.*)/(.*).(png|jpg|gif|webp|mp3|ogv|ogg|mp4) {";
  echo '            expires 7d;';
  echo "            proxy_pass http://localhost:${EPICYON_PORT};";
  echo '        }';
  echo "        location ~ ^/icons/(.*)/(like|repeat|calendar)(.*).(png|jpg|gif|webp|mp3|ogv|ogg|mp4) {";
  echo '            expires epoch;';
  echo '            proxy_no_cache 1;';
  echo "            proxy_pass http://localhost:${EPICYON_PORT};";
  echo '        }';
  echo "        location ~ ^/icons/(like|repeat|calendar)(.*).(png|jpg|gif|webp|mp3|ogv|ogg|mp4) {";
  echo '            expires epoch;';
  echo '            proxy_no_cache 1;';
  echo "            proxy_pass http://localhost:${EPICYON_PORT};";
  echo '        }';
  echo "        location ~ ^/users/(.*)/(image|banner).(png|jpg|gif|webp|mp3|ogv|ogg|mp4) {";
  echo '            expires epoch;';
  echo '            proxy_no_cache 1;';
  echo "            proxy_pass http://localhost:${EPICYON_PORT};";
  echo '        }';
  echo "        proxy_pass http://localhost:${EPICYON_PORT};";
  echo '    }';
  echo '}'; } > /etc/nginx/sites-available/epicyon

ln -s /etc/nginx/sites-available/epicyon /etc/nginx/sites-enabled/
systemctl restart nginx

echo "Your Epicyon i2p instance is now installed."
echo 'In Firefox see preferences/network settings, manual proxy and uncheck DNS over HTTPS'
echo "In a browser proxied through 127.0.0.1 port 4444 with socks5 proxy on 127.0.0.1 port 4447 navigate to http://${I2P_DOMAIN} and register an account"
exit 0