#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# ipfs functions
#
# License
# =======
#
# Copyright (C) 2014-2016 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

VARIANTS='mesh'

IPFS_GO_REPO="https://github.com/ipfs/go-ipfs"
IPFS_COMMIT='20b06a4cbce8884f5b194da6e98cb11f2c77f166'
IPFS_PORT=4001
IPFS_NODE_VERSION='6.2.2'
IPFS_JS_VERSION='0.14.3'
IPFS_JS_RONIN_VERSION='0.3.11'
IPFS_KEY_LENGTH=2048

function reconfigure_ipfs {
    echo -n ''
}

function upgrade_ipfs_go {
    if ! grep -Fxq "install_ipfs_go" $COMPLETION_FILE; then
        return
    fi

    function_check select_go_version
    select_go_version

    function_check set_repo_commit
    set_repo_commit $GOPATH/src/github.com/ipfs/go-ipfs "ipfs commit" "$IPFS_COMMIT" $IPFS_REPO
}

function upgrade_ipfs_js {
    if ! grep -Fxq "install_ipfs_js" $COMPLETION_FILE; then
        return
    fi

    npm cache clean -f
    npm install -g n
    n ${IPFS_NODE_VERSION}
    npm install ronin@${IPFS_JS_RONIN_VERSION} --global
    npm install ipfs@${IPFS_JS_VERSION} --global
}

function upgrade_ipfs {
    upgrade_ipfs_js
    upgrade_ipfs_go
}

function backup_local_ipfs {
    if ! grep -q "Admin user" $COMPLETION_FILE; then
        return
    fi
    ADMIN_USERNAME=$(cat $COMPLETION_FILE | grep "Admin user" | awk -F ':' '{print $2}')
    source_directory=/home/$ADMIN_USERNAME/.ipfs
    if [ -d $source_directory ]; then
        dest_directory=ipfs
        echo $"Backing up $source_directory to $dest_directory"

        function_check backup_directory_to_usb
        backup_directory_to_usb $source_directory $dest_directory

        echo $"Backup to $dest_directory complete"
    fi
}

function restore_local_ipfs {
    if ! grep -q "Admin user" $COMPLETION_FILE; then
        return
    fi
    if [ -d $USB_MOUNT/backup/ipfs ]; then
        echo $"Restoring IPFS"
        temp_restore_dir=/root/tempipfs
        function_check restore_directory_from_usb
        restore_directory_from_usb $temp_restore_dir ipfs
        ADMIN_USERNAME=$(cat $COMPLETION_FILE | grep "Admin user" | awk -F ':' '{print $2}')
        cp -rf $temp_restore_dir/home/$ADMIN_USERNAME/.ipfs/* /home/$ADMIN_USERNAME/.ipfs
        if [ ! "$?" = "0" ]; then
            rm -rf $temp_restore_dir
            function_check set_user_permissions
            set_user_permissions
            function_check backup_unmount_drive
            backup_unmount_drive
            exit 27627
        fi
        rm -rf $temp_restore_dir
        echo $"Restore of IPFS complete"
    fi
}

function backup_remote_ipfs {
    if ! grep -q "Admin user" $COMPLETION_FILE; then
        return
    fi
    ADMIN_USERNAME=$(cat $COMPLETION_FILE | grep "Admin user" | awk -F ':' '{print $2}')
    if [ -d /home/$ADMIN_USERNAME/.ipfs ]; then
        echo $"Backing up IPFS"
        backup_directory_to_friend /home/$ADMIN_USERNAME/.ipfs ipfs
        echo $"Backup of IPFS complete"
    fi
}

function restore_remote_ipfs {
    if [ -d $SERVER_DIRECTORY/backup/ipfs ]; then
        echo $"Restoring IPFS"
        temp_restore_dir=/root/tempipfs
        function_check restore_directory_from_friend
        restore_directory_from_friend $temp_restore_dir ipfs
        cp -rf $temp_restore_dir/home/$ADMIN_USERNAME/.ipfs/* /home/$ADMIN_USERNAME/.ipfs
        if [ ! "$?" = "0" ]; then
            function_check set_user_permissions
            set_user_permissions
            rm -rf $temp_restore_dir
            exit 276357
        fi
        rm -rf $temp_restore_dir
        echo $"Restore of IPFS complete"
    fi
}

function remove_ipfs_go {
    if ! grep -Fxq "install_ipfs_go" $COMPLETION_FILE; then
        return
    fi
    function_check select_go_version
    select_go_version
    systemctl stop ipfs
    systemctl disable ipfs
    systemctl daemon-reload
    rm /etc/systemd/system/ipfs.service
    rm -rf $GOPATH/src/github.com/ipfs
    iptables -D INPUT -p tcp --dport $IPFS_PORT -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings
    sed -i '/install_ipfs/d' $COMPLETION_FILE
    sed -i '/ipfs/d' $COMPLETION_FILE
    sed -i '/configure_firewall_for_ipfs/d' $COMPLETION_FILE
}

function remove_ipfs_js {
    if ! grep -Fxq "install_ipfs_js" $COMPLETION_FILE; then
        return
    fi
    systemctl stop ipfs
    systemctl disable ipfs
    rm /etc/systemd/system/ipfs.service
    systemctl daemon-reload

    npm uninstall ipfs --global
    npm uninstall ronin --global

    iptables -D INPUT -p tcp --dport $IPFS_PORT -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings
    sed -i '/install_ipfs/d' $COMPLETION_FILE
    sed -i '/ipfs/d' $COMPLETION_FILE
    sed -i '/configure_firewall_for_ipfs/d' $COMPLETION_FILE
}

function remove_ipfs {
    remove_ipfs_js
    remove_ipfs_go
}

function configure_firewall_for_ipfs {
    if grep -Fxq "configure_firewall_for_ipfs" $COMPLETION_FILE; then
        return
    fi
    if [[ $ONION_ONLY != "no" ]]; then
        return
    fi
    iptables -A INPUT -p tcp --dport $IPFS_PORT -j ACCEPT
    function_check save_firewall_settings
    save_firewall_settings

    OPEN_PORTS+=("IPFS     $IPFS_PORT")
    echo 'configure_firewall_for_ipfs' >> $COMPLETION_FILE
}

function install_ipfs_js {
    if grep -Fxq "install_ipfs_js" $COMPLETION_FILE; then
        return
    fi

    apt-get -y install npm
    apt-get -y install libpam0g-dev fuse

    npm cache clean -f
    npm install -g n
    n ${IPFS_NODE_VERSION}
    npm install ronin@${IPFS_JS_RONIN_VERSION} --global
    npm install ipfs@${IPFS_JS_VERSION} --global

    IPFS_PATH=/usr/local/bin

    if [ ! -f $IPFS_PATH/jsipfs ]; then
        exit 637292
    fi

    # initialise
    su -c "$IPFS_PATH/jsipfs init -b $IPFS_KEY_LENGTH" - $MY_USERNAME
    if [ ! -d /home/$MY_USERNAME/.ipfs ]; then
        echo "IPFS could not be initialised for user $MY_USERNAME"
        exit 7358
    fi

    # directories to mount to
    if [ ! -d /ipfs ]; then
        mkdir /ipfs
        mkdir /ipns
        chown $MY_USERNAME:$MY_USERNAME /ipfs
        chown $MY_USERNAME:$MY_USERNAME /ipns
    fi

    if [ -f /etc/fuse.conf ]; then
        chown $MY_USERNAME:$MY_USERNAME /etc/fuse.conf
    fi
    if [ -f /dev/fuse ]; then
        chown $MY_USERNAME:$MY_USERNAME /dev/fuse
    fi

    IPFS_DAEMON_NAME=ipfs
    IPFS_DAEMON_FILE=/etc/systemd/system/${IPFS_DAEMON_NAME}.service
    echo '[Unit]' > $IPFS_DAEMON_FILE
    echo 'Description=IPFS javascript daemon' >> $IPFS_DAEMON_FILE
    echo 'After=syslog.target' >> $IPFS_DAEMON_FILE
    echo 'After=network.target' >> $IPFS_DAEMON_FILE
    echo '' >> $IPFS_DAEMON_FILE
    echo '[Service]' >> $IPFS_DAEMON_FILE
    echo 'Type=simple' >> $IPFS_DAEMON_FILE
    echo "User=$MY_USERNAME" >> $IPFS_DAEMON_FILE
    echo "Group=$MY_USERNAME" >> $IPFS_DAEMON_FILE
    echo "WorkingDirectory=/home/$MY_USERNAME" >> $IPFS_DAEMON_FILE
    echo "ExecStart=${IPFS_PATH}/jsipfs daemon --mount" >> $IPFS_DAEMON_FILE
    echo 'Restart=on-failure' >> $IPFS_DAEMON_FILE
    echo "Environment=\"USER=$MY_USERNAME\" \"HOME=/home/$MY_USERNAME\"" >> $IPFS_DAEMON_FILE
    echo '' >> $IPFS_DAEMON_FILE
    echo '[Install]' >> $IPFS_DAEMON_FILE
    echo 'WantedBy=multi-user.target' >> $IPFS_DAEMON_FILE

    systemctl enable ${IPFS_DAEMON_NAME}
    systemctl daemon-reload
    systemctl restart ${IPFS_DAEMON_NAME}

    if [ -d /etc/avahi ]; then
        su -c "echo $($IPFS_PATH/jsipfs id | grep '\"ID\":' | awk -F '\"' '{print $4}') > /tmp/ipfsid" - $MY_USERNAME
        if [ ! -f /tmp/ipfsid ]; then
            echo 'No IPFS identity was created'
            exit 37895
        fi
        IPFS_PEER_ID=$(cat /tmp/ipfsid)
        if [ ${#IPFS_PEER_ID} -lt 10 ]; then
            echo 'Invalid IPFS peer ID'
            echo "$IPFS_PEER_ID"
            exit 74782
        fi
        # Add an avahi service
        function_check create_avahi_service
        create_avahi_service ipfs "ipfs" udp $IPFS_PORT "$IPFS_PEER_ID"
        rm /tmp/ipfsid
    fi

    function_check configure_firewall_for_ipfs
    configure_firewall_for_ipfs

    echo 'install_ipfs_js' >> $COMPLETION_FILE
}


function install_ipfs_go {
    if grep -Fxq "install_ipfs_go" $COMPLETION_FILE; then
        return
    fi

    function_check select_go_version
    select_go_version

    apt-get -y install golang libpam0g-dev fuse

    if [ ! -d /home/git ]; then
        # add a gogs user account
        adduser --disabled-login --gecos 'Gogs' git

        # install Go
        if ! grep -q "export GOPATH=" ~/.bashrc; then
            echo "export GOPATH=$GOPATH" >> ~/.bashrc
        else
            sed -i "s|export GOPATH=.*|export GOPATH=$GOPATH|g" ~/.bashrc
        fi
        systemctl set-environment GOPATH=$GOPATH
        if ! grep -q "systemctl set-environment GOPATH=" ~/.bashrc; then
            echo "systemctl set-environment GOPATH=$GOPATH" >> ~/.bashrc
        else
            sed -i "s|systemctl set-environment GOPATH=.*|systemctl set-environment GOPATH=$GOPATH|g" ~/.bashrc
        fi
        if [ ! -d $GOPATH ]; then
            mkdir -p $GOPATH
        fi
    fi

    IPFS_PATH=$GOPATH/bin
    export PATH="$GOPATH/bin:$PATH:"
    if ! grep -q 'GOPATH/bin' ~/.bashrc; then
        echo 'export PATH="$GOPATH/bin:$PATH:";' >> ~/.bashrc
    else
        sed -i "s|systemctl set-environment GOPATH=.*|systemctl set-environment GOPATH=$GOPATH|g" ~/.bashrc
    fi

    # set gopath for the user
    if ! grep -q "GOPATH=" /home/$MY_USERNAME/.bashrc; then
        echo "export GOPATH=$GOPATH" >> /home/$MY_USERNAME/.bashrc
        echo 'export PATH="$GOPATH/bin:$PATH:";' >> /home/$MY_USERNAME/.bashrc
    else
        sed -i "s|export GOPATH=.*|export GOPATH=$GOPATH|g" /home/$MY_USERNAME/.bashrc
    fi
    chown $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.bashrc

    IPFS_GO_REPO2=$(echo "$IPFS_GO_REPO" | sed 's|https://||g')
    go get -u ${IPFS_GO_REPO2}/cmd/ipfs
    if [ ! "$?" = "0" ]; then
        exit 8242
    fi

    cd $GOPATH/src/$IPFS_GO_REPO2
    git checkout $IPFS_COMMIT -b $IPFS_COMMIT
    if ! grep -q "ipfs commit" $COMPLETION_FILE; then
        echo "ipfs commit:$IPFS_COMMIT" >> $COMPLETION_FILE
    else
        sed -i "s/ipfs commit.*/ipfs commit:$IPFS_COMMIT/g" $COMPLETION_FILE
    fi

    # initialise
    su -c "$IPFS_PATH/ipfs init -b 4096" - $MY_USERNAME
    if [ ! -d /home/$MY_USERNAME/.ipfs ]; then
        echo "IPFS could not be initialised for user $MY_USERNAME"
        exit 7358
    fi

    # directories to mount to
    if [ ! -d /ipfs ]; then
        mkdir /ipfs
        mkdir /ipns
        chown $MY_USERNAME:$MY_USERNAME /ipfs
        chown $MY_USERNAME:$MY_USERNAME /ipns
    fi

    if [ -f /etc/fuse.conf ]; then
        chown $MY_USERNAME:$MY_USERNAME /etc/fuse.conf
    fi
    if [ -f /dev/fuse ]; then
        chown $MY_USERNAME:$MY_USERNAME /dev/fuse
    fi

    echo '[Unit]' > /etc/systemd/system/ipfs.service
    echo 'Description=IPFS go daemon' >> /etc/systemd/system/ipfs.service
    echo 'After=syslog.target' >> /etc/systemd/system/ipfs.service
    echo 'After=network.target' >> /etc/systemd/system/ipfs.service
    echo '' >> /etc/systemd/system/ipfs.service
    echo '[Service]' >> /etc/systemd/system/ipfs.service
    echo 'Type=simple' >> /etc/systemd/system/ipfs.service
    echo "User=$MY_USERNAME" >> /etc/systemd/system/ipfs.service
    echo "Group=$MY_USERNAME" >> /etc/systemd/system/ipfs.service
    echo "WorkingDirectory=/home/$MY_USERNAME" >> /etc/systemd/system/ipfs.service
    echo "ExecStart=$IPFS_PATH/ipfs daemon --mount" >> /etc/systemd/system/ipfs.service
    echo 'Restart=on-failure' >> /etc/systemd/system/ipfs.service
    echo "Environment=\"USER=$MY_USERNAME\" \"HOME=/home/$MY_USERNAME\" \"GOPATH=$GOPATH\" \"GVM_ROOT=$GVM_HOME\"" >> /etc/systemd/system/ipfs.service
    echo '' >> /etc/systemd/system/ipfs.service
    echo '[Install]' >> /etc/systemd/system/ipfs.service
    echo 'WantedBy=multi-user.target' >> /etc/systemd/system/ipfs.service

    systemctl enable ipfs
    systemctl daemon-reload
    systemctl restart ipfs

    if [ -d /etc/avahi ]; then
        su -c "echo $($IPFS_PATH/ipfs id | grep '\"ID\":' | awk -F '\"' '{print $4}') > /tmp/ipfsid" - $MY_USERNAME
        if [ ! -f /tmp/ipfsid ]; then
            echo 'No IPFS identity was created'
            exit 37895
        fi
        IPFS_PEER_ID=$(cat /tmp/ipfsid)
        if [ ${#IPFS_PEER_ID} -lt 10 ]; then
            echo 'Invalid IPFS peer ID'
            echo "$IPFS_PEER_ID"
            exit 74782
        fi
        # Add an avahi service
        function_check create_avahi_service
        create_avahi_service ipfs "ipfs" udp $IPFS_PORT "$IPFS_PEER_ID"
        rm /tmp/ipfsid
    fi

    function_check configure_firewall_for_ipfs
    configure_firewall_for_ipfs

    echo 'install_ipfs_go' >> $COMPLETION_FILE
}

function install_ipfs {
    install_ipfs_js
    #install_ipfs_go
}