initial commit

.drone.yml

@@ -0,0 +1,53 @@
+---
+kind: pipeline
+type: docker
+name: build
+
+steps:
+  - name: run tests
+    image: golang
+    commands:
+      - go build
+      - go test -p 1 -v ./...
+
+trigger:
+  event:
+    - pull_request
+
+---
+kind: pipeline
+type: docker
+name: deploy
+
+steps:
+  - name: run tests
+    image: golang
+    commands:
+      - go build
+      - go test -p 1 -v ./...
+  - name: docker
+    image: plugins/docker
+    settings:
+      username:
+        from_secret: gitea_packpub_username
+      password:
+        from_secret: gitea_packpub_password
+      registry: git.hatecomputers.club
+      repo: git.hatecomputers.club/hatecomputers/hatecomputers.club
+  - name: ssh
+    image: appleboy/drone-ssh
+    settings:
+      host: hatecomputers.club
+      username: root
+      key:
+        from_secret: cd_ssh_key
+      port: 22
+      command_timeout: 2m
+      script:
+        - systemctl restart docker-compose@hatecomputers-club
+
+trigger:
+  branch:
+    - main
+  event:
+    - push

.gitignore

@@ -0,0 +1,3 @@
+*.env
+backup-notify
+*.db

Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.22
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+RUN go build -o /app/backupnotify
+
+EXPOSE 8080
+
+CMD ["/app/nackupnotify", "--server", "--migrate", "--port", "8080", "--template-path", "/app/templates", "--database-path", "/app/db/nackupnotify.db", "--static-path", "/app/static", "--scheduler", "--ntfy-endpoint", "https://ntfy.internal.simponic.xyz", "--ntfy-topics", "server-backups"]

api/backups/backups.go

@@ -0,0 +1,58 @@
+package backups
+
+import (
+	"log"
+	"net/http"
+	"time"
+
+	"git.simponic.xyz/simponic/backup-notify/api/types"
+	"git.simponic.xyz/simponic/backup-notify/database"
+)
+
+func getHostStatusOverTime(backups []database.Backup) map[string][]bool {
+	hostnameBackups := make(map[string][]database.Backup)
+	statusOverTime := make(map[string][]bool)
+
+	if len(backups) == 0 {
+		return statusOverTime
+	}
+
+	firstReceivedBackup := backups[0].ReceivedOn
+	for _, backup := range backups {
+		if backup.ReceivedOn.Before(firstReceivedBackup) {
+			firstReceivedBackup = backup.ReceivedOn
+		}
+
+		if _, ok := hostnameBackups[backup.Hostname]; !ok {
+			hostnameBackups[backup.Hostname] = []database.Backup{}
+		}
+		hostnameBackups[backup.Hostname] = append(hostnameBackups[backup.Hostname], backup)
+	}
+
+	daysSinceFirstBackup := int(time.Since(firstReceivedBackup).Hours()/24) + 1
+
+	for hostname := range hostnameBackups {
+		statusOverTime[hostname] = make([]bool, daysSinceFirstBackup)
+		for _, backup := range hostnameBackups[hostname] {
+			dayReceivedOn := int(time.Since(backup.ReceivedOn).Hours() / 24)
+			statusOverTime[hostname][dayReceivedOn] = true
+		}
+	}
+
+	return statusOverTime
+}
+
+func ListBackupsContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
+	return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
+		backups, err := database.ListBackups(context.DBConn)
+		if err != nil {
+			log.Println(err)
+			resp.WriteHeader(http.StatusInternalServerError)
+			return failure(context, req, resp)
+		}
+
+		hostStatusOverTime := getHostStatusOverTime(backups)
+		(*context.TemplateData)["HostStatusOverTime"] = hostStatusOverTime
+		return success(context, req, resp)
+	}
+}

api/serve.go

@@ -0,0 +1,92 @@
+package api
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+
+	"git.simponic.xyz/simponic/backup-notify/api/backups"
+	"git.simponic.xyz/simponic/backup-notify/api/template"
+	"git.simponic.xyz/simponic/backup-notify/api/types"
+	"git.simponic.xyz/simponic/backup-notify/args"
+	"git.simponic.xyz/simponic/backup-notify/utils"
+)
+
+func LogRequestContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
+	return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
+		context.Start = time.Now()
+		context.Id = utils.RandomId()
+
+		log.Println(req.Method, req.URL.Path, req.RemoteAddr, context.Id)
+		return success(context, req, resp)
+	}
+}
+
+func LogExecutionTimeContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
+	return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
+		end := time.Now()
+		log.Println(context.Id, "took", end.Sub(context.Start))
+
+		return success(context, req, resp)
+	}
+}
+
+func HealthCheckContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
+	return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
+		resp.WriteHeader(200)
+		resp.Write([]byte("healthy"))
+		return success(context, req, resp)
+	}
+}
+
+func FailurePassingContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
+	return func(_success types.Continuation, failure types.Continuation) types.ContinuationChain {
+		return failure(context, req, resp)
+	}
+}
+
+func IdContinuation(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
+	return func(success types.Continuation, _failure types.Continuation) types.ContinuationChain {
+		return success(context, req, resp)
+	}
+}
+
+func CacheControlMiddleware(next http.Handler, maxAge int) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		header := fmt.Sprintf("public, max-age=%d", maxAge)
+		w.Header().Set("Cache-Control", header)
+		next.ServeHTTP(w, r)
+	})
+}
+
+func MakeServer(argv *args.Arguments, dbConn *sql.DB) *http.Server {
+	mux := http.NewServeMux()
+
+	staticFileServer := http.FileServer(http.Dir(argv.StaticPath))
+	mux.Handle("GET /static/", http.StripPrefix("/static/", CacheControlMiddleware(staticFileServer, 3600)))
+
+	makeRequestContext := func() *types.RequestContext {
+		return &types.RequestContext{
+			DBConn:       dbConn,
+			Args:         argv,
+			TemplateData: &map[string]interface{}{},
+		}
+	}
+
+	mux.HandleFunc("GET /health", func(w http.ResponseWriter, r *http.Request) {
+		requestContext := makeRequestContext()
+		LogRequestContinuation(requestContext, r, w)(HealthCheckContinuation, FailurePassingContinuation)(LogExecutionTimeContinuation, LogExecutionTimeContinuation)(IdContinuation, IdContinuation)
+	})
+
+	mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
+		requestContext := makeRequestContext()
+		LogRequestContinuation(requestContext, r, w)(backups.ListBackupsContinuation, backups.ListBackupsContinuation)(template.TemplateContinuation("backup_list.html", true), FailurePassingContinuation)(LogExecutionTimeContinuation, LogExecutionTimeContinuation)(IdContinuation, IdContinuation)
+	})
+
+	return &http.Server{
+		Addr:    ":" + fmt.Sprint(argv.Port),
+		Handler: mux,
+	}
+}

api/template/template.go

@@ -0,0 +1,73 @@
+package template
+
+import (
+	"bytes"
+	"errors"
+	"html/template"
+	"log"
+	"net/http"
+	"os"
+
+	"git.simponic.xyz/simponic/backup-notify/api/types"
+)
+
+func renderTemplate(context *types.RequestContext, templateName string, showBaseHtml bool) (bytes.Buffer, error) {
+	templatePath := context.Args.TemplatePath
+	basePath := templatePath + "/base_empty.html"
+	if showBaseHtml {
+		basePath = templatePath + "/base.html"
+	}
+
+	templateLocation := templatePath + "/" + templateName
+	tmpl, err := template.New("").ParseFiles(templateLocation, basePath)
+	if err != nil {
+		return bytes.Buffer{}, err
+	}
+
+	dataPtr := context.TemplateData
+	if dataPtr == nil {
+		dataPtr = &map[string]interface{}{}
+	}
+
+	data := *dataPtr
+
+	var buffer bytes.Buffer
+	err = tmpl.ExecuteTemplate(&buffer, "base", data)
+
+	if err != nil {
+		return bytes.Buffer{}, err
+	}
+	return buffer, nil
+}
+
+func TemplateContinuation(path string, showBase bool) types.Continuation {
+	return func(context *types.RequestContext, req *http.Request, resp http.ResponseWriter) types.ContinuationChain {
+		return func(success types.Continuation, failure types.Continuation) types.ContinuationChain {
+			html, err := renderTemplate(context, path, true)
+			if errors.Is(err, os.ErrNotExist) {
+				resp.WriteHeader(404)
+				html, err = renderTemplate(context, "404.html", true)
+				if err != nil {
+					log.Println("error rendering 404 template", err)
+					resp.WriteHeader(500)
+					return failure(context, req, resp)
+				}
+
+				resp.Header().Set("Content-Type", "text/html")
+				resp.Write(html.Bytes())
+				return failure(context, req, resp)
+			}
+
+			if err != nil {
+				log.Println("error rendering template", err)
+				resp.WriteHeader(500)
+				resp.Write([]byte("error rendering template"))
+				return failure(context, req, resp)
+			}
+
+			resp.Header().Set("Content-Type", "text/html")
+			resp.Write(html.Bytes())
+			return success(context, req, resp)
+		}
+	}
+}

api/types/types.go

@@ -0,0 +1,26 @@
+package types
+
+import (
+	"database/sql"
+	"net/http"
+	"time"
+
+	"git.simponic.xyz/simponic/backup-notify/args"
+)
+
+type RequestContext struct {
+	DBConn *sql.DB
+	Args   *args.Arguments
+
+	Id    string
+	Start time.Time
+
+	TemplateData *map[string]interface{}
+}
+
+type BannerMessages struct {
+	Messages []string
+}
+
+type Continuation func(*RequestContext, *http.Request, http.ResponseWriter) ContinuationChain
+type ContinuationChain func(Continuation, Continuation) ContinuationChain

args/args.go

@@ -0,0 +1,52 @@
+package args
+
+import (
+	"flag"
+	"strings"
+)
+
+type Arguments struct {
+	DatabasePath string
+	TemplatePath string
+	StaticPath   string
+
+	Migrate   bool
+	Scheduler bool
+
+	NtfyEndpoint string
+	NtfyTopics   []string
+
+	Port   int
+	Server bool
+}
+
+func GetArgs() (*Arguments, error) {
+	databasePath := flag.String("database-path", "./backupnotify.db", "Path to the SQLite database")
+
+	templatePath := flag.String("template-path", "./templates", "Path to the template directory")
+	staticPath := flag.String("static-path", "./static", "Path to the static directory")
+
+	scheduler := flag.Bool("scheduler", false, "Run scheduled jobs via cron")
+	migrate := flag.Bool("migrate", false, "Run the migrations")
+	ntfyEndpoint := flag.String("ntfy-endpoint", "https://ntfy.sh", "")
+	ntfyTopics := flag.String("ntfy-topics", "server-backup", "")
+
+	port := flag.Int("port", 8080, "Port to listen on")
+	server := flag.Bool("server", false, "Run the server")
+
+	flag.Parse()
+
+	arguments := &Arguments{
+		DatabasePath: *databasePath,
+		TemplatePath: *templatePath,
+		StaticPath:   *staticPath,
+		Port:         *port,
+		Server:       *server,
+		Migrate:      *migrate,
+		Scheduler:    *scheduler,
+		NtfyEndpoint: *ntfyEndpoint,
+		NtfyTopics:   strings.Split(*ntfyTopics, ","),
+	}
+
+	return arguments, nil
+}

database/backups.go

@@ -0,0 +1,51 @@
+package database
+
+import (
+	"database/sql"
+	"log"
+	"time"
+)
+
+type Backup struct {
+	Hostname   string
+	ReceivedOn time.Time
+}
+
+func ListBackups(dbConn *sql.DB) ([]Backup, error) {
+	log.Println("listing backups")
+
+	rows, err := dbConn.Query(`SELECT hostname, received_on FROM backups;`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	backups := []Backup{}
+	for rows.Next() {
+		var backup Backup
+		err := rows.Scan(&backup.Hostname, &backup.ReceivedOn)
+		if err != nil {
+			return nil, err
+		}
+		backups = append(backups, backup)
+	}
+
+	return backups, nil
+}
+
+func DeleteOldBackups(dbConn *sql.DB, days int) error {
+	log.Println("deleting old backups")
+
+	duration := time.Duration(days) * 24 * time.Hour
+	_, err := dbConn.Exec(`DELETE FROM backups WHERE received_on < ?;`, time.Now().Add(-duration))
+
+	return err
+}
+
+func ReceivedBackup(dbConn *sql.DB, hostname string) error {
+	log.Println("received backup for", hostname)
+
+	_, err := dbConn.Exec(`INSERT INTO backups (hostname) VALUES (?);`, hostname)
+
+	return err
+}

database/conn.go

@@ -0,0 +1,17 @@
+package database
+
+import (
+	"database/sql"
+	_ "github.com/mattn/go-sqlite3"
+	"log"
+)
+
+func MakeConn(databasePath *string) *sql.DB {
+	log.Println("opening database at", *databasePath, "with foreign keys enabled")
+	dbConn, err := sql.Open("sqlite3", *databasePath+"?_foreign_keys=on")
+	if err != nil {
+		panic(err)
+	}
+
+	return dbConn
+}

database/migrate.go

@@ -0,0 +1,42 @@
+package database
+
+import (
+	"log"
+
+	"database/sql"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type Migrator func(*sql.DB) (*sql.DB, error)
+
+func MigrateBackups(dbConn *sql.DB) (*sql.DB, error) {
+	log.Println("migrating backups table")
+
+	_, err := dbConn.Exec(`CREATE TABLE IF NOT EXISTS backups (
+		hostname TEXT NOT NULL,
+		received_on TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+	);`)
+	if err != nil {
+		return dbConn, err
+	}
+
+	return dbConn, nil
+}
+
+func Migrate(dbConn *sql.DB) (*sql.DB, error) {
+	log.Println("migrating database")
+
+	migrations := []Migrator{
+		MigrateBackups,
+	}
+
+	for _, migration := range migrations {
+		dbConn, err := migration(dbConn)
+		if err != nil {
+			return dbConn, err
+		}
+	}
+
+	return dbConn, nil
+}

docker-compose.yml

@@ -0,0 +1,18 @@
+version: "3"
+
+services:
+  api:
+    restart: always
+    image: git.simponic.xyz/simponic/backup-notify
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "http://localhost:8080/api/health"]
+      interval: 5s
+      timeout: 10s
+      retries: 5
+    env_file: .env
+    volumes:
+      - ./db:/app/db
+      - ./templates:/app/templates
+      - ./static:/app/static
+    ports:
+      - "127.0.0.1:4455:8080"

go.mod

@@ -0,0 +1,15 @@
+module git.simponic.xyz/simponic/backup-notify
+
+go 1.22.1
+
+require (
+	github.com/go-co-op/gocron v1.37.0
+	github.com/joho/godotenv v1.5.1
+	github.com/mattn/go-sqlite3 v1.14.22
+)
+
+require (
+	github.com/google/uuid v1.4.0 // indirect
+	github.com/robfig/cron/v3 v3.0.1 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+)

go.sum

@@ -0,0 +1,42 @@
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+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -0,0 +1,96 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+
+	"git.simponic.xyz/simponic/backup-notify/api"
+	"git.simponic.xyz/simponic/backup-notify/args"
+	"git.simponic.xyz/simponic/backup-notify/database"
+	"git.simponic.xyz/simponic/backup-notify/ntfy"
+	"git.simponic.xyz/simponic/backup-notify/scheduler"
+	"github.com/joho/godotenv"
+)
+
+func main() {
+	log.SetFlags(log.LstdFlags | log.Lshortfile)
+
+	err := godotenv.Load()
+	if err != nil {
+		log.Println("could not load .env file:", err)
+	}
+
+	argv, err := args.GetArgs()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	dbConn := database.MakeConn(&argv.DatabasePath)
+	defer dbConn.Close()
+
+	if argv.Migrate {
+		_, err = database.Migrate(dbConn)
+		if err != nil {
+			log.Fatal(err)
+		}
+		log.Println("database migrated successfully")
+	}
+
+	if argv.Scheduler {
+		scheduler.StartScheduler(dbConn)
+	}
+
+	if argv.NtfyEndpoint != "" {
+		ntfy := ntfy.MakeNtfyWatcher(argv.NtfyEndpoint, argv.NtfyTopics)
+		notifications := ntfy.Watch()
+
+		go func() {
+			for notification := range notifications {
+				// message type is a struct, so we can marshal it to JSON
+				message := notification.Text
+				messageStruct := struct {
+					Id      string `json:"id"`
+					Time    int    `json:"time"`
+					Message string `json:"message"`
+					Event   string `json:"event"`
+				}{}
+
+				err := json.Unmarshal([]byte(message), &messageStruct)
+				if err != nil {
+					log.Println("could not unmarshal message:", err)
+					continue
+				}
+
+				if messageStruct.Event == "keepalive" {
+					log.Println("received keepalive message")
+					continue
+				}
+
+				if messageStruct.Event != "message" {
+					log.Println("received unknown event:", messageStruct.Event)
+					continue
+				}
+
+				log.Println("received backup host:", messageStruct.Message)
+				err = database.ReceivedBackup(dbConn, messageStruct.Message)
+				if err != nil {
+					log.Println("could not record backup:", err)
+				}
+			}
+		}()
+	}
+
+	if argv.Server {
+		server := api.MakeServer(argv, dbConn)
+		log.Println("🚀🚀 API listening on port", argv.Port)
+
+		go func() {
+			err = server.ListenAndServe()
+			if err != nil {
+				log.Fatal(err)
+			}
+		}()
+	}
+
+	select {} // block forever
+}

ntfy/watcher.go

@@ -0,0 +1,77 @@
+package ntfy
+
+import (
+	"bufio"
+	"log"
+	"net/http"
+	"net/url"
+	"path"
+	"time"
+)
+
+type Message struct {
+	Topic string
+	Text  string
+}
+
+type NtfyWatcher struct {
+	Endpoint string
+	Topics   []string
+}
+
+func (w *NtfyWatcher) Watch() chan Message {
+	notifications := make(chan Message)
+
+	for _, topic := range w.Topics {
+		log.Println("subscribing to topic:", topic)
+
+		go func() {
+			retryCount := 5
+			retryTime := 5 * time.Second
+			retries := retryCount
+
+			retry := func() {
+				log.Println("waiting 5 seconds before reconnecting. retries left:", retries, "topic:", topic, "endpoint:", w.Endpoint)
+				time.Sleep(retryTime)
+				retries--
+			}
+
+			for true {
+				if retries == 0 {
+					log.Fatal("too many retries, exiting")
+				}
+
+				endpoint, _ := url.JoinPath(w.Endpoint, path.Join(topic, "json"))
+				resp, err := http.Get(endpoint)
+				if err != nil {
+					log.Println("error connecting to endpoint:", err)
+					retry()
+					continue
+				}
+
+				defer resp.Body.Close()
+				scanner := bufio.NewScanner(resp.Body)
+				for scanner.Scan() {
+					text := scanner.Text()
+					log.Println("received notification:", text)
+					notifications <- Message{Topic: topic, Text: text}
+					retries = retryCount // reset retries
+				}
+
+				if err := scanner.Err(); err != nil {
+					log.Println("error reading response body:", err)
+					retry()
+				}
+			}
+		}()
+	}
+
+	return notifications
+}
+
+func MakeNtfyWatcher(endpoint string, topics []string) *NtfyWatcher {
+	return &NtfyWatcher{
+		Endpoint: endpoint,
+		Topics:   topics,
+	}
+}

scheduler/scheduler.go

@@ -0,0 +1,17 @@
+package scheduler
+
+import (
+	"database/sql"
+	"time"
+
+	"git.simponic.xyz/simponic/backup-notify/database"
+	"github.com/go-co-op/gocron"
+)
+
+func StartScheduler(dbConn *sql.DB) {
+	scheduler := gocron.NewScheduler(time.Local)
+	scheduler.Every(1).Minute().Do(func() {
+		database.DeleteOldBackups(dbConn, 31)
+	})
+	scheduler.StartAsync()
+}

static/css/blinky.css

@@ -0,0 +1,9 @@
+.blinky {
+  animation: blinker 1s step-start infinite;
+}
+
+@keyframes blinker {
+  50% {
+    opacity: 0;
+  }
+}

static/css/club.css

@@ -0,0 +1,48 @@
+.club-members {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  justify-content: left;
+  gap: 20px;
+  padding: 20px;
+}
+
+.club-member {
+  flex: 1;
+  background-color: var(--background-color-2);
+  border: 1px solid var(--border-color);
+  padding: 10px;
+  display: flex;
+  flex-direction: row;
+  align-items: center;
+  justify-content: space-around;
+  gap: 10px;
+  max-width: 600px;
+  min-width: 400px;
+  line-break: anywhere;
+}
+
+.club-bio {
+  white-space: pre-wrap;
+  border-top: 1px solid var(--border-color);
+}
+
+.avatar {
+  flex: 1;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+
+.avatar div {
+  background-position: center center;
+  background-repeat: no-repeat;
+  background-size: cover;
+  width: 120px;
+  height: 120px;
+  border-radius: 25%;
+}
+
+.about {
+  flex: 2;
+}

static/css/colors.css

@@ -0,0 +1,51 @@
+:root {
+  --background-color-light: #f4e8e9;
+  --background-color-light-2: #f5e6f3;
+  --text-color-light: #333;
+  --confirm-color-light: #91d9bb;
+  --link-color-light: #d291bc;
+  --container-bg-light: #fff7f87a;
+  --border-color-light: #692fcc;
+  --error-color-light: #a83254;
+
+  --background-color-dark: #333;
+  --background-color-dark-2: #2c2c2c;
+  --text-color-dark: #f4e8e9;
+  --confirm-color-dark: #4d8f73;
+  --link-color-dark: #b86b77;
+  --container-bg-dark: #424242ea;
+  --border-color-dark: #956ade;
+  --error-color-dark: #851736;
+}
+
+[data-theme="DARK"] {
+  --background-color: var(--background-color-dark);
+  --background-color-2: var(--background-color-dark-2);
+  --text-color: var(--text-color-dark);
+  --link-color: var(--link-color-dark);
+  --container-bg: var(--container-bg-dark);
+  --border-color: var(--border-color-dark);
+  --error-color: var(--error-color-dark);
+  --confirm-color: var(--confirm-color-dark);
+}
+
+[data-theme="LIGHT"] {
+  --background-color: var(--background-color-light);
+  --background-color-2: var(--background-color-light-2);
+  --text-color: var(--text-color-light);
+  --link-color: var(--link-color-light);
+  --container-bg: var(--container-bg-light);
+  --border-color: var(--border-color-light);
+  --error-color: var(--error-color-light);
+  --confirm-color: var(--confirm-color-light);
+}
+
+.error {
+  background-color: var(--error-color);
+  padding: 1rem;
+}
+
+.success {
+  background-color: var(--confirm-color);
+  padding: 1rem;
+}

static/css/form.css

@@ -0,0 +1,42 @@
+.form {
+  max-width: 600px;
+  padding: 1em;
+  background: var(--background-color-2);
+  border: 1px solid #ccc;
+}
+
+label {
+  display: block;
+  margin: 0 0 1em;
+  font-weight: bold;
+}
+
+input {
+  display: block;
+  width: 100%;
+  padding: 0.5em;
+  margin: 0 0 1em;
+  border: 1px solid var(--border-color);
+  background: var(--container-bg);
+}
+
+button,
+input[type="submit"] {
+  padding: 0.5em 1em;
+  background: var(--link-color);
+  color: var(--text-color);
+  border: 0;
+  cursor: pointer;
+}
+
+textarea {
+  display: block;
+  width: 100%;
+  padding: 0.5em;
+  margin: 0 0 1em;
+  border: 1px solid var(--border-color);
+  background: var(--container-bg);
+
+  resize: vertical;
+  min-height: 100px;
+}

static/css/guestbook.css

@@ -0,0 +1,16 @@
+.entry {
+  margin-bottom: 10px;
+  border: 1px solid var(--border-color);
+
+  padding: 10px;
+  max-width: 700px;
+}
+
+.entry-name {
+  font-weight: bold;
+}
+
+.entry-message {
+  margin-left: 20px;
+  white-space: pre-wrap;
+}

static/css/styles.css

@@ -0,0 +1,43 @@
+@import "/static/css/colors.css";
+
+* {
+  box-sizing: border-box;
+  color: var(--text-color);
+}
+
+body {
+  font-family: "Roboto", sans-serif;
+  background-color: var(--background-color);
+}
+
+table {
+  width: auto;
+  border-collapse: collapse;
+  border: 1px solid var(--border-color);
+}
+
+th,
+td {
+  padding: 12px 20px;
+  text-align: center;
+  border-bottom: 1px solid var(--border-color);
+}
+
+th,
+thead {
+  background-color: var(--background-color-2);
+}
+
+tbody tr:nth-child(odd) {
+  background-color: var(--background-color);
+  color: var(--text-color);
+}
+
+tbody tr {
+  transition: background-color 0.3s ease;
+}
+
+tbody tr:hover {
+  background-color: #ff47daa0;
+  color: #2a2a2a;
+}

static/css/table.css

@@ -0,0 +1,31 @@
+table {
+  width: auto;
+  border-collapse: collapse;
+  border: 1px solid var(--border-color);
+}
+
+th,
+td {
+  padding: 12px 20px;
+  text-align: left;
+  border-bottom: 1px solid var(--border-color);
+}
+
+th,
+thead {
+  background-color: var(--background-color-2);
+}
+
+tbody tr:nth-child(odd) {
+  background-color: var(--background-color);
+  color: var(--text-color);
+}
+
+tbody tr {
+  transition: background-color 0.3s ease;
+}
+
+tbody tr:hover {
+  background-color: #ff47daa0;
+  color: #2a2a2a;
+}

templates/404.html

@@ -0,0 +1,7 @@
+{{ define "content" }}
+<h1>page not found</h1>
+<p><em>but hey, at least you found our witty 404 page. that's something, right?</em></p>
+
+<p><a href="/">go back home</a></p>
+
+{{ end }}

templates/backup_list.html

@@ -0,0 +1,27 @@
+{{ define "content" }}
+  {{ if (eq (len .HostStatusOverTime) 0) }}
+    no backups yet!
+  {{ end }}
+
+  {{ range $hostname, $backupList := .HostStatusOverTime }}
+    <div>{{ $hostname }}</div><br>
+    <table>
+      <tr>
+        {{ range $i, $_ := $backupList }}
+          <th>{{ $i }}</th>
+        {{ end }}
+      </tr>
+      <tr>
+        {{ range $seen := $backupList }}
+            {{ if $seen }}
+              <td class="success">x</td>
+            {{ else }}
+              <td class="error">!!</td>
+            {{ end }}
+          </td>
+        {{ end }}
+      </tr>
+    </table>
+    <br><hr><br>
+  {{ end }}
+{{ end }}

templates/base.html

@@ -0,0 +1,18 @@
+{{ define "base" }}
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>backup notify</title>
+    <meta charset="utf-8">
+    <meta name="viewport" content=
+    "width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
+    <link rel="stylesheet" type="text/css" href=
+    "/static/css/styles.css">
+  </head>
+  <body data-theme="DARK">
+    <div id="content" class="container">
+      {{ template "content" . }}
+    </div>
+  </body>
+</html>
+{{ end }}

templates/base_empty.html

@@ -0,0 +1,3 @@
+{{ define "base" }}
+    {{ template "content" . }}
+{{ end }}

utils/random_id.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"crypto/rand"
+	"fmt"
+)
+
+func RandomId() string {
+	id := make([]byte, 16)
+	_, err := rand.Read(id)
+	if err != nil {
+		panic(err)
+	}
+
+	return fmt.Sprintf("%x", id)
+}