Init

Makefile

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+EXTENSION ?= 
+DIST_DIR ?= dist/
+GOOS ?= linux
+ARCH ?= $(shell uname -m)
+BUILDINFOSDET ?= 
+
+SOFT_NAME    := epee_service
+SOFT_VERSION := $(shell git describe --tags $(git rev-list --tags --max-count=1))
+VERSION_PKG   := $(shell echo $(SOFT_VERSION) | sed 's/^v//g')
+ARCH          := x86_64
+LICENSE       := AGPL-3
+URL           := https://git.gnous.eu/enpls/epee-service
+DESCRIPTION   := EnPLS Epee (Enpls Proxy EnginE) Utility Service
+BUILDINFOS    :=  ($(shell date +%FT%T%z)$(BUILDINFOSDET))
+LDFLAGS       := '-X main.version=$(SOFT_VERSION) -X main.buildinfos=$(BUILDINFOS)'
+
+OUTPUT_SOFT := $(DIST_DIR)frite-$(SOFT_VERSION)-$(GOOS)-$(ARCH)$(EXTENSION)
+
+.PHONY: vet
+vet:
+	go vet main.go
+
+.PHONY: test
+test:
+	go test -v ./...
+
+.PHONY: prepare
+prepare:
+	mkdir -p $(DIST_DIR)
+
+.PHONY: clean
+clean:
+	rm -rf $(DIST_DIR)
+
+.PHONY: build
+build: prepare
+	go build -ldflags $(LDFLAGS) -o $(OUTPUT_SOFT)
+
+.PHONY: package-deb
+package-deb: prepare
+	fpm -s dir -t deb -n $(SOFT_NAME) -v $(VERSION_PKG) \
+        --description "$(DESCRIPTION)"  \
+        --url "$(URL)" \
+        --architecture $(ARCH) \
+        --license "$(LICENSE)" \
+        --package $(DIST_DIR) \
+        $(OUTPUT_SOFT)=/usr/bin/frite-web \
+		extra/links.txt.example=/etc/frite/links.txt \
+		extra/frite-web.service=/usr/lib/systemd/system/frite-web.service
+
+.PHONY: package-rpm
+package-rpm: prepare
+	fpm -s dir -t rpm -n $(SOFT_NAME) -v $(VERSION_PKG) \
+		--description "$(DESCRIPTION)" \
+		--url "$(URL)" \
+		--architecture $(ARCH) \
+		--license "$(LICENSE) "\
+		--package $(DIST_DIR) \
+		$(OUTPUT_SOFT)=/usr/bin/frite-web \
+		extra/links.txt.example=/etc/frite/links.txt \
+		extra/frite-web.service=/usr/lib/systemd/system/frite-web.service

go.mod

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+module git.gnous.eu/enpls/epee-service
+
+go 1.19

main.go

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+package main
+
+import (
+	"embed"
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+)
+
+//go:embed static
+var staticFS embed.FS
+
+//go:embed templates
+var templatesFS embed.FS
+
+// Error model
+type Error struct {
+	Title   string `json:"title"`
+	Message string `json:"message"`
+}
+
+func main() {
+	port := "5900"
+
+	http.Handle("/static/", http.FileServer(http.FS(staticFS)))
+	http.HandleFunc("/", errorHandler)
+
+	log.Printf("Listening on :%s...", port)
+	err := http.ListenAndServe(fmt.Sprintf(":%s", port), nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func errorHandler(w http.ResponseWriter, r *http.Request) {
+	errorCode := r.URL.Query().Get("error")
+
+	// Load error messages from JSON file
+	jsonData, err := templatesFS.ReadFile("templates/errors.json")
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	errors := make(map[string]Error)
+	err = json.Unmarshal(jsonData, &errors)
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	errorData := errors[errorCode]
+	if errorData.Title == "" {
+		errorData.Title = "Error"
+		errorData.Message = "An error occurred."
+	}
+
+	// Render error page
+	tmpl, err := templatesFS.ReadFile("templates/error.html")
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	t, err := template.New("error").Parse(string(tmpl))
+	if err != nil {
+		generateInternalServerError(w, err)
+		return
+	}
+	t.Execute(w, errorData)
+}
+
+func generateInternalServerError(w http.ResponseWriter, err error) {
+	log.Println(err)
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(http.StatusInternalServerError)
+	w.Write([]byte(`{"error": "Internal Server Error"}`))
+}

static/main.css

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+@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@500;800&display=swap');
+
+* {
+    margin: 0px;
+    padding: 0px;
+}
+
+body {
+    font-family: 'Nunito', sans-serif;
+    background-color: #f1efe9;
+    color: #282828;
+    font-weight: 500;
+}
+
+h1 {
+    font-weight: 800;
+}
+
+.container {
+    display: flex;
+    min-height: 100vh;
+    flex-direction: column;
+}
+
+.main {
+    flex: 1;
+}
+
+.header {
+    padding: 20px;
+    text-align: center;
+}
+
+.main {
+    width: 80%;
+    margin: 0 auto;
+    margin-top: 5vh;
+}
+
+.main h1 {
+    font-size: 8vh;
+}
+
+.main p {
+    padding-top: 0.5vh;
+}
+
+.footer {
+    background-color: #282828;
+    color: #f1efe9;
+    padding: 20px;
+    text-align: center;
+}
+
+.main a {
+    color: #7d5fff;
+}
+
+.footer a {
+    color: #f1efe9;
+}

templates/error.html

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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>{{.Title}}</title>
+    <link rel="stylesheet" href="/static/main.css">
+</head>
+
+<body>
+    <div class="container">
+        <div class="header">
+            <h1>EnPLS Network </h1>
+        </div>
+        <div class="main">
+            <h1>{{.Title}}</h1>
+            <p>{{.Message}}</p>
+            <p>If you believe that this situation is unusual, please don't hesitate to <a
+                    href="mailto:mael@enpls.org">contact us</a>.
+        </div>
+        <div class="footer">
+            <p>&copy; Copyright {{.Year}} EnPLS Network - <a href="https://enpls.org">enpls.org</a> </p>
+        </div>
+    </div>
+</body>
+
+</html>

templates/errors.json

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+{
+    "404": {
+        "title": "404, Page Not Found.",
+        "message": "Ooops! It looks like the ressource you were looking for is no were to be found."
+    },
+    "403": {
+        "title": "403, Access Denied.",
+        "message": "Ooops! It looks like you don't have the right to access this ressource."
+    },
+    "502": {
+        "title": "502, Backend Unavailable.",
+        "message": "Ooops! The requested backend service is unavailable. This error might be due to an ongoing maintenance or a service disruption. You might want to take a look at our service status page."
+    },
+    "503": {
+        "title": "503, Service Unavailable.",
+        "message": "Ooops! The requested service is unavailable. This error might be due to an ongoing maintenance or a service disruption. You might want to take a look at our service status page."
+    },
+    "500": {
+        "title": "500, Internal Server Error.",
+        "message": "Ooops! It looks like something went wrong on our side. We are working on it and will be back shortly."
+    }
+}