docker-expose

#!/bin/bash
# Docker Client Plugin Manager (CLIP)
# Expose a container HTTP publicly on the Internet
#
# (c) 2019 Łukasz Lach
#   llach@llach.pl
#   https://lach.dev
usage() {
cat <<EOF

Usage: docker expose [OPTIONS] CONTAINER PORT

Expose a container HTTP publicly on the Internet

Options:
  -f                         Force and stop the existing proxy, if running
EOF
}
shift
if [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
    usage
    exit 0
fi
FORCE=0
if [ "$1" == "-f" ]; then
    shift
    FORCE=1
fi
if docker ps --format '{{.Names}}' | grep -e "^clip-expose$" &>/dev/null; then
    if [ "$FORCE" == "0" ]; then
        echo "Error: Only one container can be exposed at a time, use -f to force"
        exit 1
    fi
fi
CONTAINER_NAME="$1"
CONTAINER_PORT="$2"
CONTAINER_ID=$(docker inspect --format '{{.Id}}' "$CONTAINER_NAME")
if [ $? != 0 ]; then
    echo "Error: Container $CONTAINER_NAME does not exist"
    exit 1
fi
CONTAINER_SHORT_ID=$(echo "$CONTAINER_ID" | cut -c 1-12)
CONTAINER_STATUS=$(docker inspect --format '{{.State.Status}}' "$CONTAINER_NAME")
if [ "$CONTAINER_STATUS" != "running" ]; then
    echo "Error: Container $CONTAINER_NAME is not running"
    exit 1
fi

for NETWORK_CONTAINER in $(docker network inspect --format '{{range .Containers}}{{.Name}} {{end}}' clip-expose-network 2>/dev/null); do
    docker network disconnect -f clip-expose-network "$NETWORK_CONTAINER"
done
docker network rm clip-expose-network >/dev/null
set -e
echo "Creating network"
docker network create -d bridge clip-expose-network >/dev/null
docker network connect clip-expose-network "$CONTAINER_NAME"
docker rm -f clip-expose >/dev/null || true
echo "Starting proxy for $CONTAINER_NAME:$CONTAINER_PORT"
PROXY_CONTAINER=$(docker run -d -it --name clip-expose \
    --net clip-expose-network \
    lukaszlach/ngrok \
    ngrok http \
        --log /dev/stdout --log-format term \
        "$CONTAINER_SHORT_ID:$CONTAINER_PORT"
)
if [ $? != 0 ]; then
    echo "Error: Failed to start proxy container"
    exit 1
fi
echo "Proxy is running, fetching public address details"
LOG_COUNT=0
while read LOG_STRING; do
    if ! echo "$LOG_STRING" | grep 'url=' >/dev/null; then
        continue
    fi
    echo "$LOG_STRING" | grep -oe 'url=.*' | cut -c 5-
    LOG_COUNT=$(((LOG_COUNT+1)))
    if [ $LOG_COUNT == 2 ]; then
        break
    fi
done < <(docker logs -f clip-expose)
echo "Successfully exposed $CONTAINER_NAME:$CONTAINER_PORT"
exit 0