Significant update

- Runs without root
- Internal port changed to 8000
- Healthcheck added
- Added emojis
- Switched to go modules
- Added hooks for labels
- Added env variable LISTENINGPORT with checks
- Updated readme

Dockerfile

@@ -1,29 +1,55 @@
-FROM alpine:3.8 AS stackedit
+ARG ALPINE_VERSION=3.8
-RUN echo https://alpine.global.ssl.fastly.net/alpine/v3.8/main > /etc/apk/repositories && \
+ARG GO_VERSION=1.11.2
-    apk add -q --progress --update --no-cache git npm
+ARG STACKEDIT_VERSION=v5.13.2
-RUN git clone --branch v5.13.2 --single-branch --depth 1 https://github.com/benweet/stackedit.git /stackedit &> /dev/null
+
+FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS builder
+RUN apk --update add git build-base upx
+RUN go get -u -v golang.org/x/vgo
+WORKDIR /tmp/gobuild
+
+FROM scratch AS final
+ARG BUILD_DATE
+ARG VCS_REF
+ARG STACKEDIT_VERSION
+LABEL org.label-schema.schema-version="1.0.0-rc1" \
+      maintainer="quentin.mcgaw@gmail.com" \
+      org.label-schema.build-date=$BUILD_DATE \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.label-schema.vcs-url="https://github.com/qdm12/stackedit-docker" \
+      org.label-schema.url="https://github.com/qdm12/stackedit-docker" \
+      org.label-schema.vcs-description="StackEdit server in a lightweight Docker container" \
+      org.label-schema.vcs-usage="https://github.com/qdm12/stackedit-docker/blob/master/README.md#setup" \
+      org.label-schema.docker.cmd="docker run -d -p 8000:8000/tcp qmcgaw/stackedit" \
+      org.label-schema.docker.cmd.devel="docker run -it --rm -p 8000:8000/tcp qmcgaw/stackedit" \
+      org.label-schema.docker.params="" \
+      org.label-schema.version=$STACKEDIT_VERSION \
+      image-size="29.3MB" \
+      ram-usage="7MB" \
+      cpu-usage="Very low"
+EXPOSE 8000
+HEALTHCHECK --start-period=1s --interval=100s --timeout=2s --retries=1 CMD ["/server","healthcheck"]
+USER 1000
+ENTRYPOINT ["/server"]
+
+FROM alpine:${ALPINE_VERSION} AS stackedit
+ARG STACKEDIT_VERSION
+WORKDIR /stackedit
+RUN apk add -q --progress --update --no-cache git npm
+RUN wget -q https://github.com/benweet/stackedit/archive/${STACKEDIT_VERSION}.tar.gz -O stackedit.tar.gz && \
+    tar -xzf stackedit.tar.gz --strip-components=1 && \
+    rm stackedit.tar.gz
 WORKDIR /stackedit
 RUN npm install
 RUN npm run build
 
-FROM golang:alpine AS server
+FROM builder AS server
-RUN apk --update add git build-base upx
+COPY go.mod go.sum ./
-WORKDIR /go/src/app
+RUN go mod download
-COPY main.go ./
+COPY *.go ./
-RUN go get -v ./... && \
+RUN go test -v
-    CGO_ENABLED=0 GOOS=linux go build -a -ldflags="-s -w" -installsuffix cgo -o server . && \
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -ldflags="-s -w" -o app .
-    upx -v --best --ultra-brute --overlay=strip server && \
+RUN upx -v --best --ultra-brute --overlay=strip app && upx -t app
-    upx -t server
 
-FROM scratch
+FROM final
-LABEL maintainer="quentin.mcgaw@gmail.com" \
+COPY --from=stackedit --chown=1000 /stackedit/dist /html
-      description="StackEdit server in a lightweight Docker container" \
+COPY --from=server --chown=1000 /tmp/gobuild/app /server
-      download="9.9MB" \
-      size="29.2MB" \
-      ram="7MB" \
-      cpu_usage="Very low" \
-      github="https://github.com/qdm12/stackedit-docker"
-EXPOSE 80
-COPY --from=stackedit /stackedit/dist /
-COPY --from=server /go/src/app/server /server
-ENTRYPOINT [ "/server" ]

README.md

@@ -1,16 +1,12 @@
 # StackEdit Docker server
 
-Run a StackEdit v5.13.2 (October 2018) server with Nginx in a lightweight Docker container
+*StackEdit v5.13.2 (November 2018) with a Golang HTTP server on Scratch*
 
 [![Docker StackEdit](https://github.com/qdm12/stackedit-docker/raw/master/readme/title.png)](https://hub.docker.com/r/qmcgaw/stackedit/)
 
-Docker build:
 [![Build Status](https://travis-ci.org/qdm12/stackedit-docker.svg?branch=master)](https://travis-ci.org/qdm12/stackedit-docker)
 [![Docker Build Status](https://img.shields.io/docker/build/qmcgaw/stackedit.svg)](https://hub.docker.com/r/qmcgaw/stackedit)
 
-Stackedit build:
-[![Build Status](https://img.shields.io/travis/benweet/stackedit.svg?style=flat)](https://travis-ci.org/benweet/stackedit)
-
 [![GitHub last commit](https://img.shields.io/github/last-commit/qdm12/stackedit-docker.svg)](https://github.com/qdm12/stackedit-docker/commits)
 [![GitHub commit activity](https://img.shields.io/github/commit-activity/y/qdm12/stackedit-docker.svg)](https://github.com/qdm12/stackedit-docker/commits)
 [![GitHub issues](https://img.shields.io/github/issues/qdm12/stackedit-docker.svg)](https://github.com/qdm12/stackedit-docker/issues)
@@ -19,31 +15,33 @@ Stackedit build:
 [![Docker Stars](https://img.shields.io/docker/stars/qmcgaw/stackedit.svg)](https://hub.docker.com/r/qmcgaw/stackedit)
 [![Docker Automated](https://img.shields.io/docker/automated/qmcgaw/stackedit.svg)](https://hub.docker.com/r/qmcgaw/stackedit)
 
-[![](https://images.microbadger.com/badges/image/qmcgaw/stackedit.svg)](https://microbadger.com/images/qmcgaw/stackedit)
+[![Image size](https://images.microbadger.com/badges/image/qmcgaw/stackedit.svg)](https://microbadger.com/images/qmcgaw/stackedit)
-[![](https://images.microbadger.com/badges/version/qmcgaw/stackedit.svg)](https://microbadger.com/images/qmcgaw/stackedit)
+[![Image version](https://images.microbadger.com/badges/version/qmcgaw/stackedit.svg)](https://microbadger.com/images/qmcgaw/stackedit)
 
-| Download size | Image size | RAM usage | CPU usage |
+| Image size | RAM usage | CPU usage |
-| --- | --- | --- | --- |
+| --- | --- | --- |
-| 9.9MB | 29.2MB | 7MB | Very low |
+| 29.3MB | 7MB | Very low |
 
 ## Features
 
 - [Stackedit features](https://github.com/benweet/stackedit/blob/master/README.md#stackedit-can)
 - Lightweight image based on:
   - [Stackedit 5.13.2](https://github.com/benweet/stackedit)
-  - Alpine 3.8
+  - [Scratch](https://hub.docker.com/_/scratch)
-  - Nginx HTTP server
+  - Golang simple HTTP static server
+- Running without root
+- Built-in Docker healthcheck
+- Nice emojis in the logs...
 
 ## Setup
 
-Using plain Docker with:
+Run with:
 
 ```bash
-docker run -d --name=stackedit --restart=always -p 8000:80/tcp qmcgaw/stackedit
+docker run -d -p 8000:8000/tcp qmcgaw/stackedit
 ```
 
-
+Compose with:
-Or use Docker Compose:
 
 ```yml
 version: '3'
@@ -52,22 +50,23 @@ services:
     image: qmcgaw/stackedit
     container_name: stackedit
     ports:
-      - 8000:80/tcp
+      - 8000:8000/tcp
     network_mode: bridge
-    restart: always
 ```
 
+and `docker-compose up -d`
 
-with the command
+Build with:
-
 
 ```bash
-docker-compose up -d
+docker build -t qmcgaw/stackedit https://github.com/qdm12/stackedit-docker.git
 ```
 
-## Testing
+Access with [http://localhost:8000](http://localhost:8000)
+
+## Environment variables
 
-Go to [http://localhost:8000](http://localhost:8000)
+- `LISTENINGPORT` to change the internal HTTP server listening port if you need to
 
 ## Acknowledgements
 
@@ -76,4 +75,4 @@ of [StackEdit](https://stackedit.io/)
 
 ## TODOs
 
-- [ ] Configuration of Stackedit
+- [ ] Configuration of Stackedit with env variables

docker-compose.yml

@@ -4,6 +4,6 @@ services:
     image: qmcgaw/stackedit
     container_name: stackedit
     ports:
-      - 8000:80/tcp
+      - 8000:8000/tcp
     network_mode: bridge
     restart: always

go.mod

@@ -0,0 +1,6 @@
+module github.com/qdm12/stackedit-docker
+
+require (
+	github.com/julienschmidt/httprouter v1.2.0
+	github.com/kyokomi/emoji v1.5.1
+)

go.sum

@@ -0,0 +1,4 @@
+github.com/julienschmidt/httprouter v1.2.0 h1:TDTW5Yz1mjftljbcKqRcrYhd4XeOoI98t+9HbQbYf7g=
+github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
+github.com/kyokomi/emoji v1.5.1 h1:qp9dub1mW7C4MlvoRENH6EAENb9skEFOvIEbp1Waj38=
+github.com/kyokomi/emoji v1.5.1/go.mod h1:mZ6aGCD7yk8j6QY6KICwnZ2pxoszVseX1DNoGtU2tBA=

hooks/build

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# see http://label-schema.org/rc1
+# https://docs.docker.com/docker-cloud/builds/advanced/#override-build-test-or-push-commands
+# https://docs.docker.com/docker-cloud/builds/advanced/#custom-build-phase-hooks
+
+docker build --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
+             --build-arg VCS_REF=`git rev-parse --short HEAD` \
+             -t $IMAGE_NAME .

main.go

@@ -4,21 +4,99 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"os"
+	"strconv"
+	"time"
 
 	"github.com/kyokomi/emoji"
 )
 
-const listeningPort = "80"
+const defaultListeningPort = "8000"
+
+func parseEnv() (listeningPort string) {
+	listeningPort = os.Getenv("LISTENINGPORT")
+	if len(listeningPort) == 0 {
+		listeningPort = defaultListeningPort
+	} else {
+		value, err := strconv.Atoi(listeningPort)
+		if err != nil {
+			log.Fatal(emoji.Sprint(":x:") + " LISTENINGPORT environment variable '" + listeningPort +
+				"' is not a valid integer")
+		}
+		if value < 1024 {
+			if os.Geteuid() == 0 {
+				log.Println(emoji.Sprint(":warning:") + "LISTENINGPORT environment variable '" + listeningPort +
+					"' allowed to be in the reserved system ports range as you are running as root.")
+			} else if os.Geteuid() == -1 {
+				log.Println(emoji.Sprint(":warning:") + "LISTENINGPORT environment variable '" + listeningPort +
+					"' allowed to be in the reserved system ports range as you are running in Windows.")
+			} else {
+				log.Fatal(emoji.Sprint(":x:") + " LISTENINGPORT environment variable '" + listeningPort +
+					"' can't be in the reserved system ports range (1 to 1023) when running without root.")
+			}
+		}
+		if value > 65535 {
+			log.Fatal(emoji.Sprint(":x:") + " LISTENINGPORT environment variable '" + listeningPort +
+				"' can't be higher than 65535")
+		}
+		if value > 49151 {
+			// dynamic and/or private ports.
+			log.Println(emoji.Sprint(":warning:") + "LISTENINGPORT environment variable '" + listeningPort +
+				"' is in the dynamic/private ports range (above 49151)")
+		}
+	}
+	return listeningPort
+}
+
+func healthcheckMode() bool {
+	args := os.Args
+	if len(args) > 1 {
+		if len(args) > 2 {
+			log.Fatal(emoji.Sprint(":x:") + " Too many arguments provided")
+		}
+		if args[1] == "healthcheck" {
+			return true
+		}
+		log.Fatal(emoji.Sprint(":x:") + " Argument 1 can only be 'healthcheck', not " + args[1])
+	}
+	return false
+}
+
+func healthcheck(listeningPort string) {
+	request, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:"+listeningPort+"/healthcheck", nil)
+	if err != nil {
+		fmt.Println("Can't build HTTP request")
+		os.Exit(1)
+	}
+	client := &http.Client{Timeout: time.Duration(1000) * time.Millisecond}
+	response, err := client.Do(request)
+	if err != nil {
+		fmt.Println("Can't execute HTTP request")
+		os.Exit(1)
+	}
+	if response.StatusCode != 200 {
+		fmt.Println("Status code is " + response.Status)
+		os.Exit(1)
+	}
+	os.Exit(0)
+}
 
 func main() {
+	listeningPort := parseEnv()
+	if healthcheckMode() {
+		healthcheck(listeningPort)
+	}
 	fmt.Println("#####################################")
 	fmt.Println("########## StackEdit Server #########")
 	fmt.Println("########## by Quentin McGaw #########")
 	fmt.Println("########## Give some " + emoji.Sprint(":heart:") + "at ##########")
 	fmt.Println("# github.com/qdm12/stackedit-docker #")
 	fmt.Print("#####################################\n\n")
+	http.HandleFunc("/healthcheck", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	})
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		http.ServeFile(w, r, r.URL.Path[1:])
+		http.ServeFile(w, r, "/html/"+r.URL.Path[1:])
 	})
 	log.Println("Web UI listening on 0.0.0.0:" + listeningPort + emoji.Sprint(" :ear:"))
 	log.Fatal(http.ListenAndServe("0.0.0.0:"+listeningPort, nil))