controllers/addOfficeHourHandler.go

@@ -7,6 +7,7 @@ import (
 	"net/mail"
 	"officeHours/config"
 	"officeHours/models"
+	"officeHours/templating"
 	"strconv"
 	"strings"
 )
@@ -149,10 +150,7 @@ func (b *BaseHandler) AddOfficeHourHandler(w http.ResponseWriter, req *http.Requ
 		id, err := b.officeHourRepo.Add(officeHour)
 		if err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
-			templateError := Templates.ExecuteTemplate(w, "addFailure.html", err)
+			templating.ServeTemplate(w, "addFailure", err)
-			if templateError != nil {
-				log.Printf("Error executing template addFailure.html: %s", templateError.Error())
-			}
 			return
 		}
 		officeHour, err = b.officeHourRepo.FindById(id)
@@ -163,10 +161,8 @@ func (b *BaseHandler) AddOfficeHourHandler(w http.ResponseWriter, req *http.Requ
 		if err != nil {
 			log.Printf("Error adding request: %s", err.Error())
 		}
-		templateError := Templates.ExecuteTemplate(w, "addSuccess.html", struct{}{})
+		templating.ServeTemplate(w, "addSuccess", nil)
-		if templateError != nil {
+
-			log.Printf("Error executing template addSuccess.html: %s", templateError.Error())
-		}
 	}
 }
 
@@ -177,10 +173,5 @@ func (b *BaseHandler) writeAddOfficeHourMask(w http.ResponseWriter, req *http.Re
 	if len(data.Errors) != 0 {
 		w.WriteHeader(http.StatusBadRequest)
 	}
-	templateError := Templates.ExecuteTemplate(w, "addMask.html", data)
+	templating.ServeTemplate(w, "addMask", data)
-	if templateError != nil {
-		log.Printf("Error executing template addMask.html: %s", templateError.Error())
-		w.Write([]byte(fmt.Sprintf("Template konnte nicht geparst werden : %s", templateError.Error())))
-		return
-	}
 }

controllers/confirmRequestHandler.go

@@ -1,8 +1,8 @@
 package controllers
 
 import (
-	"log"
 	"net/http"
+	"officeHours/templating"
 )
 
 func (b *BaseHandler) ConfirmRequestHandler(w http.ResponseWriter, req *http.Request) {
@@ -11,24 +11,16 @@ func (b *BaseHandler) ConfirmRequestHandler(w http.ResponseWriter, req *http.Req
 
 	if err != nil {
 		w.WriteHeader(http.StatusNotFound)
-		templateError := Templates.ExecuteTemplate(w, "requestNotFound.html", struct{}{})
+		templating.ServeTemplate(w, "requestNotFound", nil)
-		if templateError != nil {
-			log.Printf("Error executing template requestNotFound.html: %s", templateError.Error())
-		}
 		return
 	}
 
 	err = b.requestRepo.Execute(request)
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
-		templateError := Templates.ExecuteTemplate(w, "executeFailure.html", err.Error())
+		templating.ServeTemplate(w, "executeFailure", err.Error())
-		if templateError != nil {
-			log.Printf("Error executing template executeFailure.html: %s", templateError.Error())
-		}
 		return
 	}
-	templateError := Templates.ExecuteTemplate(w, "executeSuccess.html", struct{}{})
+	templating.ServeTemplate(w, "executeSuccess", nil)
-	if templateError != nil {
+
-		log.Printf("Error executing template executeSuccess.html: %s", templateError.Error())
-	}
 }

controllers/deleteOfficeHourHandler.go

@@ -2,13 +2,15 @@
 package controllers
 
 import (
-	"log"
 	"net/http"
 	"officeHours/models"
+	"officeHours/templating"
 	"strconv"
 )
 
 func (b *BaseHandler) DeleteOfficeHourHandler(w http.ResponseWriter, req *http.Request) {
+	// TODO: error handling here is by no means sufficient, furthermore
+	//	400 BadRequest is for technically wrong stuff (most promimently GET instead of POST)
 	if req.FormValue("id") != "" {
 		id, err := strconv.Atoi(req.FormValue("id"))
 		if err != nil {
@@ -19,10 +21,7 @@ func (b *BaseHandler) DeleteOfficeHourHandler(w http.ResponseWriter, req *http.R
 			w.WriteHeader(http.StatusBadRequest)
 		}
 		_, err = b.requestRepo.Add(officeHour, models.RequestDelete)
-		templateError := Templates.ExecuteTemplate(w, "deleteSuccess.html", struct{}{})
+		templating.ServeTemplate(w, "deleteSuccess", nil)
-		if templateError != nil {
-			log.Printf("Error executing template deleteSuccess.html: %s", templateError.Error())
-		}
 	} else {
 		officeHours, _ := b.officeHourRepo.GetAll(true)
 		timetable, slots := b.GetTimetable(officeHours)

controllers/getHandlers.go

@@ -1,11 +1,11 @@
 package controllers
 
 import (
-	"fmt"
 	"html/template"
 	"log"
 	"net/http"
 	"officeHours/models"
+	"officeHours/templating"
 	"strconv"
 )
 
@@ -32,6 +32,7 @@ func (b *BaseHandler) GetByCourseHandler(w http.ResponseWriter, req *http.Reques
 	courseid, err := strconv.Atoi(req.FormValue("veranstaltung"))
 	if err != nil {
 		b.RootHandler(w, req)
+		return
 	}
 	course, err := b.courseRepo.FindById(courseid)
 	if err != nil {
@@ -58,10 +59,5 @@ func (b *BaseHandler) writeTimetablePage(w http.ResponseWriter, req *http.Reques
 		SelectedRoom   int
 		SelectedCourse int
 	}{courses, rooms, timetable, selectedRoom, selectedCourse}
-	templateError := Templates.ExecuteTemplate(w, "index.html", data)
+	templating.ServeTemplate(w, "index", data)
-	if templateError != nil {
-		log.Printf("Error executing template index.html: %s", templateError.Error())
-		w.Write([]byte(fmt.Sprintf("Template konnte nicht geparst werden : %s", templateError.Error())))
-		return
-	}
 }

controllers/templates.go

@@ -1,21 +0,0 @@
-package controllers
-
-import (
-	"html/template"
-	"officeHours/models"
-)
-
-var Templates, TemplateError = template.Must(template.ParseFiles(
-	"templates/addFailure.html",
-	"templates/addMask.html",
-	"templates/addSuccess.html",
-	"templates/deleteSuccess.html",
-	"templates/executeFailure.html",
-	"templates/executeSuccess.html",
-	"templates/footer.html",
-	"templates/head.html",
-	"templates/index.html",
-	"templates/officeHourTable.html",
-	"templates/requestNotFound.html")).
-	New("").Funcs(template.FuncMap{"DayName": models.DayName,
-	"divide": func(i int, j int) int { return i / j }}).ParseFiles("templates/confirmationMail", "templates/td.html")

controllers/timetable.go

@@ -7,6 +7,7 @@ import (
 	"html/template"
 	"log"
 	"officeHours/models"
+	"officeHours/templating"
 )
 
 func (b *BaseHandler) GetTimetable(officeHours []models.OfficeHour) (timetable map[models.Date]map[int]models.OfficeHour, slots []int) {
@@ -85,9 +86,11 @@ func (b *BaseHandler) printTimetable(timetable map[models.Date]map[int]models.Of
 								MinuteGranularity int
 								DeleteIcons       bool
 							}{OfficeHour: current, MinuteGranularity: b.config.Date.MinuteGranularity, DeleteIcons: deleteIcons}
-							templateError := Templates.ExecuteTemplate(&celldata, "td.html", data)
+							err := templating.WriteTemplate(&celldata, "td", data)
-							if templateError != nil {
+							if err != nil {
-								log.Printf("Error executing template td.html: %s", templateError.Error())
+								err = fmt.Errorf("writing table cell failed:\n%w", err)
+								log.Println(err.Error())
+								// TODO: better error wrapping up to top-level request handler
 							}
 							tableBody += celldata.String()
 						}
@@ -120,9 +123,11 @@ func (b *BaseHandler) printTimetable(timetable map[models.Date]map[int]models.Of
 		slots[4],
 		template.HTML(tableBody),
 	}
-	templateError := Templates.ExecuteTemplate(&table, "officeHourTable.html", tableData)
+	err := templating.WriteTemplate(&table, "officeHourTable", tableData)
-	if templateError != nil {
+	if err != nil {
-		log.Printf("Error executing template officeHourTable.html: %s", templateError.Error())
+		err = fmt.Errorf("writing table failed:\n%w", err)
+		log.Println(err.Error())
+		// TODO: better error wrapping up to top-level request handler
 	}
 	return template.HTML(table.String())
 }

main.go

@@ -11,6 +11,7 @@ import (
 	"officeHours/controllers"
 	"officeHours/repositories"
 	"officeHours/sqldb"
+	"officeHours/templating"
 	"os"
 )
 
@@ -20,10 +21,6 @@ func main() {
 		log.SetOutput(logwriter)
 	}
 
-	if controllers.TemplateError != nil {
-		log.Fatalf("Error parsing templates: %s", controllers.TemplateError.Error())
-	}
-
 	configFile := flag.String(
 		"config",
 		"config/config.json",
@@ -40,9 +37,16 @@ func main() {
 		log.Fatalf("%s: %s", "Reading JSON config file into config structure", err)
 	}
 
+	// serve static files
+	staticHandler := http.FileServer(http.Dir("./static"))
+	// parse templates
+	if err = templating.InitTemplates(); err != nil {
+		log.Fatal(err.Error())
+	}
+	// database connection
 	db, err := sqldb.Connect(conf)
 	if err != nil {
-		log.Fatalf(err.Error())
+		log.Fatal(err.Error())
 	}
 	// Create repos
 	roomRepo := repositories.NewRoomRepo(db)
@@ -58,7 +62,8 @@ func main() {
 	http.HandleFunc("/confirmRequest", h.ConfirmRequestHandler)
 	http.HandleFunc("/deleteOfficeHour", h.DeleteOfficeHourHandler)
 	http.HandleFunc("/", h.RootHandler)
+	http.Handle("/static/", http.StripPrefix("/static/", staticHandler))
 
 	err = http.ListenAndServe(fmt.Sprintf("%s:%d", conf.Server.ListenAddress, conf.Server.ListenPort), nil)
-	log.Println(err.Error())
+	log.Fatal(err.Error())
 }

repositories/request.go

@@ -11,8 +11,8 @@ import (
 	"math/big"
 	"net/smtp"
 	"officeHours/config"
-	"officeHours/controllers"
 	"officeHours/models"
+	"officeHours/templating"
 )
 
 type RequestRepo struct {
@@ -118,7 +118,7 @@ func (r *RequestRepo) newSecret() (string, error) {
 	for !errors.Is(err, sql.ErrNoRows) {
 		secret = randomString(r.config.Request.SecretLength)
 		_, err = r.FindBySecret(secret)
-		if err != nil && errors.Is(err, sql.ErrNoRows) {
+		if err != nil && !errors.Is(err, sql.ErrNoRows) {
 			return "", err
 		}
 	}
@@ -131,12 +131,13 @@ func (r *RequestRepo) sendConfirmationMail(request models.Request) error {
 		Config  config.Config
 		Request models.Request
 	}{r.config, request}
-	err := controllers.Templates.ExecuteTemplate(&message, "confirmationMail", data)
+	err := templating.WriteTemplate(&message, "confirmationMail", data)
 	if err != nil {
 		err = fmt.Errorf("Error parsing confirmation Mail: %w", err)
 		log.Println(err.Error())
 		return err
 	}
+
 	switch r.config.Mailer.Type {
 	case "Stdout":
 		fmt.Println(message.String())

static/bootstrap

@@ -0,0 +1 @@
+bootstrap-5.2.1-dist/

templates/addFailure.html

@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head>
-    <title>Sprechstunde anlegen</title>
-    {{template "head.html" .}}
-  </head>
-  <body>
-    Irgendetwas ist schief gegangen. Bitte sende folgende Daten an <a href="mailto:sprechstundentool@mathebau.de">sprechstundentool@mathebau.de</a> mit einer Beschreibung, was du tun wolltest.
-    <br />
-    {{.}}
-    {{template "footer.html" .}}
-  </body>
-</html>

templates/addMask.html

@@ -1,50 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head>
-    <title>Sprechstunde anlegen</title>
-    {{template "head.html" .}}
-  </head>
-  <body>
-    <p>
-    {{range .Errors}}{{.}}<br />{{end}}
-    </p>
-    <form method="POST" action="addOfficeHour">
-      <label for="veranstaltung">Veranstaltung</label>: 
-      <select name="veranstaltung" id="veranstaltung">{{range $course := .Courses}}
-        <option value="{{$course.Id}}"{{if eq $course.Id $.SelectedCourse}} selected{{end}}>{{$course.Name}}</option>{{end}}
-      </select><br />
-      <label for="woche">Woche</label>: 
-      <select name="woche" id="woche">
-        <option value="0"{{if eq 0 $.Date.Week}} selected{{end}}>Jede</option>
-        <option value="1"{{if eq 1 $.Date.Week}} selected{{end}}>Ungerade</option>
-        <option value="2"{{if eq 2 $.Date.Week}} selected{{end}}>Gerade</option>
-      </select><br />
-      <label for="tag">Tag</label>: <select name="tag" id="tag">
-        <option value="0"{{if eq 0 $.Date.Day}} selected{{end}}>Montag</option>
-        <option value="1"{{if eq 1 $.Date.Day}} selected{{end}}>Dienstag</option>
-        <option value="2"{{if eq 2 $.Date.Day}} selected{{end}}>Mittwoch</option>
-        <option value="3"{{if eq 3 $.Date.Day}} selected{{end}}>Donnerstag</option>
-        <option value="4"{{if eq 4 $.Date.Day}} selected{{end}}>Freitag</option>
-      </select><br />
-      <label for="startzeit">Startzeit</label>: <input type="time" name="startzeit" id="startzeit" min="08:00" max="17:30" {{if gt $.Date.Hour 7}}value="{{printf "%02d" $.Date.Hour}}:{{printf "%02d" $.Date.Minute}}"{{end}} required/><br />
-      <label for="dauer">Dauer in Minuten</label>: <input name="dauer" id="dauer" type="number" min="{{.MinuteGranularity}}" max="120" step="{{.MinuteGranularity}}" value="{{.Duration}}" required/><br />
-      <label for="raum">Raum</label>: 
-      <select name="raum" id="raum">{{range $room := .Rooms}}
-        <option value="{{$room.Id}}"{{if eq $room.Id $.SelectedRoom}} selected{{end}}>{{$room.Name}}</option>{{end}}
-      </select><br />
-      <label for="raumname">Raumname (für Sonderräume)</label>: <input type="text" name="raumname" id="raumname" value="{{.Roomname}}"/><br />
-      <label for="name">Name</label>: <input name="name" id="name" type="text" size="50" value="{{.Name}}" required/><br />
-      <label for="email">Email-Adresse</label>: 
-      <input name="email" id="email" type="email" size="50" value="{{.Email}}" required/><br />
-      <label for="info">Info</label>: <input name="info" id="info" type="text" size="50" value="{{.Info}}"/><br />
-      <input type="submit">
-    </form>
-    {{if ne .Config.Tutor.MailSuffix ""}}Du musst hier eine Email-Adresse angeben, die auf „{{.Config.Tutor.MailSuffix}}“ endet.<br />{{end}}
-    Außerdem dürfen in Räumen nur begrenzt viele Sprechstunden gleichzeitig stattfinden, nämlich
-    <dl>
-      {{range $room := .Rooms}}
-      <dt>{{$room.Name}}</dt><dd>{{$room.MaxOccupy}} Sprechstunde{{if gt $room.MaxOccupy 1}}n{{end}}</dd>{{end}}
-    </dl>
-    {{template "footer.html" .}}
-  </body>
-</html>

templates/addSuccess.html

@@ -1,12 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head>
-    <title>Sprechstunde anlegen</title>
-    {{template "head.html" .}}
-  </head>
-  <body>
-    Die Sprechstunde wurde angelegt. Du solltest eine Mail mit einem Aktivierungslink erhalten haben. 
-    <br />
-    {{template "footer.html" .}}
-  </body>
-</html>

templates/deleteSuccess.html

@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head>
-    <title>Sprechstunde löschen</title>
-    {{template "head.html" .}}
-  </head>
-  <body>
-    Du solltest eine Mail mit einem Bestätigungslink erhalten haben. <br />
-    Sie wurde an die Adresse geschickt, mit der die Sprechstunde angelegt wurde.
-    <br />
-    {{template "footer.html" .}}
-  </body>
-</html>

templates/executeFailure.html

@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head>
-    <title>Anfrage ausführen fehlgeschlagen</title>
-    {{template "head.html" .}}
-  </head>
-  <body>
-    Irgendetwas ist schief gegangen. Bitte sende folgende Daten an <a href="mailto:sprechstundentool@mathebau.de">sprechstundentool@mathebau.de</a> mit einer Beschreibung, was du tun wolltest.
-    <br />
-    {{.}}
-    {{template "footer.html" .}}
-  </body>
-</html>

templates/executeSuccess.html

@@ -1,11 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head>
-    <title>Anfrage ausgeführt</title>
-    {{template "head.html" .}}
-  </head>
-  <body>
-    Deine Anfrage wurde ausgeführt. <br />
-    {{template "footer.html" .}}
-  </body>
-</html>

templates/footer.html

@@ -1,6 +0,0 @@
-<footer>
-  <a href="/">Startseite</a><br />
-  <a href="/addOfficeHour">Sprechstunde anlegen</a><br />
-  <a href="/deleteOfficeHour">Sprechstunde löschen</a><br />
-  Technische Fragen an <a href="mailto:sprechstundentool@mathebau.de">sprechstundentool@mathebau.de</a>
-</footer>

templates/head.html

@@ -1,4 +0,0 @@
-<meta charset="UTF-8">
-<meta name="keywords" content="Mathebau, Sprechstunde, Sprechstunden, Mathe, Mathematik, technische, Universität, Darmstadt, TU, Fachschaft">
-<meta name="description" content="Eine Übersicht der Sprechstunden, die in den offenen Arbeitsräumen der Fachschaft Mathematik, TU Darmstadt, angeboten werden">
-<meta name="viewport" content="width=device-width, initial-scale=1.0">

templates/index.html

@@ -1,29 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head> 
-    <title>Sprechstunden</title>
-    {{template "head.html" .}}
-  </head> 
-  <body> 
-    <form method="GET" action="/getByCourse">
-      <label for="veranstaltung">Veranstaltung: </label>
-      <select name="veranstaltung" id="veranstaltung" size="1" onchange="document.forms[0].submit()">
-        <option value="">Alle</option>
-        {{range $course := .Courses}}
-        <option value="{{$course.Id}}"{{if eq $course.Id $.SelectedCourse}} selected{{end}}>{{$course.Name}}</option>{{end}}
-      </select>
-      <input type="submit" value="Auswählen" />
-    </form>
-    <form method="GET" action="/getByRoom">
-      <label for="raum">Raum: </label>
-      <select name="raum" id="raum" size="1" onchange="document.forms[1].submit()">
-        <option value="">Alle</option>
-        {{range $room := .Rooms}}
-        <option value="{{$room.Id}}"{{if eq $room.Id $.SelectedRoom}} selected{{end}}>{{$room.Name}}</option>{{end}}
-      </select> 
-      <input type="submit" value="Auswählen" />
-    </form>
-    {{.Timetable}}
-    {{template "footer.html" .}}
-  </body>
-</html>

templates/requestNotFound.html

@@ -1,18 +0,0 @@
-<!DOCTYPE html>
-<html lang="de">
-  <head>
-    <title>Anfrage bestätigen fehlgeschlagen</title>
-    {{template "head.html" .}}
-  </head>
-  <body>
-    <p>
-    Dieser Bestätigungscode ist nicht verfügbar. <br />
-    Bitte gib deinen Bestätigungscode hier ein. 
-    </p>
-    <form action="/confirmRequest">
-      <label for="code">Bestätigungscode</label>: <input type="text" name="code" id="code"/>
-      <input type="submit" />
-    </form>
-    {{template "footer.html" .}}
-  </body>
-</html>

templating/templates.go

@@ -0,0 +1,138 @@
+package templating
+
+import (
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+	"net/http"
+	"officeHours/models"
+	"os"
+	"time"
+)
+
+// parsed templates available for execution
+var templates map[string]*template.Template = map[string]*template.Template{}
+
+// Initialise and parse templates.
+//
+// Should only be called once.
+//
+// Since this is something which may error and feels like
+// it should not be done automatically on import,
+// put it into a function.
+func InitTemplates() error {
+	const templateDir = "templating/templates/"
+	var funcs = template.FuncMap{
+		"DayName": models.DayName,
+		"divide":  func(i int, j int) int { return i / j },
+	}
+	var emptyTemplate = template.New("").Funcs(funcs)
+	var baseTemplate, err = template.ParseFiles(templateDir + "base.html")
+	if err != nil {
+		return fmt.Errorf("parsing base template failed:\n%w", err)
+	}
+	baseTemplate.Funcs(funcs)
+
+	type toCache struct {
+		filename   string
+		standalone bool
+	}
+	var toParse = map[string]toCache{
+		// full html templates
+		"addFailure":      {"addFailure.html", false},
+		"addMask":         {"addMask.html", false},
+		"addSuccess":      {"addSuccess.html", false},
+		"deleteSuccess":   {"deleteSuccess.html", false},
+		"executeFailure":  {"executeFailure.html", false},
+		"executeSuccess":  {"executeSuccess.html", false},
+		"index":           {"index.html", false},
+		"requestNotFound": {"requestNotFound.html", false},
+		// standalone templates
+		"confirmationMail": {"confirmationMail", true},
+		"officeHourTable":  {"officeHourTable.html", true},
+		"td":               {"td.html", true},
+	}
+
+	// parse templates and add to global mapping
+	for key, tmpl := range toParse {
+		if _, exists := templates[key]; exists {
+			return fmt.Errorf("template '%s' already parsed", key)
+		}
+		fullName := templateDir + tmpl.filename
+		// check that template file
+		info, err := os.Stat(fullName)
+		if err != nil {
+			return fmt.Errorf("adding template %s failed:\n%w", tmpl.filename, err)
+		}
+		if info.IsDir() {
+			return fmt.Errorf("adding template %s failed: is a directory", tmpl.filename)
+		}
+		// parse
+		var parsed *template.Template
+		if tmpl.standalone {
+			parsed, err = emptyTemplate.Clone()
+			parsed = parsed.New(tmpl.filename)
+		} else {
+			parsed, err = baseTemplate.Clone()
+		}
+		if err != nil {
+			return fmt.Errorf("cloning base template failed:\n%w", err)
+		}
+		parsed, err = parsed.ParseFiles(fullName)
+		if err != nil {
+			return fmt.Errorf("parsing template %s failed:\n%w", tmpl.filename, err)
+		}
+		templates[key] = parsed
+	}
+	return nil
+}
+
+// Execute a template and write it to the given writer.
+//
+// Parameters:
+//   - name: name of the template to execute
+//   - data: passed through to the template
+func WriteTemplate(w io.Writer, name string, data any) error {
+	tmpl, exists := templates[name]
+	if !exists {
+		return fmt.Errorf("template %s not available", name)
+	}
+	tmpl, err := tmpl.Clone()
+	if err != nil {
+		return fmt.Errorf("cloning template failed:\n%w", err)
+	}
+	err = tmpl.Execute(w, data)
+	if err != nil {
+		return fmt.Errorf("template execution failed:\n%w", err)
+	}
+	return nil
+}
+
+// Execute a template and write it to a http writer.
+//
+// Similar to WriteTemplate, but in error case this adds a corresponding
+// status code and writes an error message to the writer.
+//
+// Typically, this is the final action in handling an http request.
+//
+// Parameters:
+//   - name: name of the template to execute
+//   - data: passed through to the template
+func ServeTemplate(w http.ResponseWriter, name string, data any) {
+	// TODO: make this return an error, handle on top of every request handler
+	err := WriteTemplate(w, name, data)
+	if err != nil {
+		err = fmt.Errorf("writing template failed:\n%w", err)
+		log.Println(err.Error())
+		w.WriteHeader(http.StatusInternalServerError)
+		io.WriteString(w, `Internal Server Error.
+
+Du kannst uns helfen, indem du folgende Fehlermeldung per Mail
+an sprechstunden@mathebau.de sendest:
+
+Fehler um\n
+`+time.Now().String()+"\n"+err.Error())
+		return
+	}
+}

templating/templates/addFailure.html

@@ -0,0 +1,7 @@
+{{define "title"}}Fehler{{end}}
+
+{{define "content"}}
+Irgendetwas ist schief gegangen. Bitte sende folgende Daten an <a href="mailto:sprechstundentool@mathebau.de">sprechstundentool@mathebau.de</a> mit einer Beschreibung, was du tun wolltest.
+<br />
+{{.}}
+{{end}}

templating/templates/addMask.html

@@ -0,0 +1,52 @@
+<{{define "title"}}Sprechstunde anlegen{{end}}
+
+{{define "content"}}
+<p>
+  {{range .Errors}}{{.}}<br />{{end}}
+</p>
+<form method="POST" action="addOfficeHour">
+  <label for="veranstaltung">Veranstaltung</label>:
+  <select name="veranstaltung" id="veranstaltung">
+    {{range $course := .Courses}}
+    <option value="{{$course.Id}}"{{if eq $course.Id $.SelectedCourse}} selected{{end}}>{{$course.Name}}</option>
+    {{end}}
+  </select><br />
+  <label for="woche">Woche</label>:
+  <select name="woche" id="woche">
+    <option value="0"{{if eq 0 $.Date.Week}} selected{{end}}>Jede</option>
+    <option value="1"{{if eq 1 $.Date.Week}} selected{{end}}>Ungerade</option>
+    <option value="2"{{if eq 2 $.Date.Week}} selected{{end}}>Gerade</option>
+  </select><br />
+  <label for="tag">Tag</label>: <select name="tag" id="tag">
+    <option value="0"{{if eq 0 $.Date.Day}} selected{{end}}>Montag</option>
+    <option value="1"{{if eq 1 $.Date.Day}} selected{{end}}>Dienstag</option>
+    <option value="2"{{if eq 2 $.Date.Day}} selected{{end}}>Mittwoch</option>
+    <option value="3"{{if eq 3 $.Date.Day}} selected{{end}}>Donnerstag</option>
+    <option value="4"{{if eq 4 $.Date.Day}} selected{{end}}>Freitag</option>
+  </select><br />
+  <label for="startzeit">Startzeit</label>: <input type="time" name="startzeit" id="startzeit" min="08:00" max="17:30" {{if gt $.Date.Hour 7}}value="{{printf "%02d" $.Date.Hour}}:{{printf "%02d" $.Date.Minute}}"{{end}} required/><br />
+  <label for="dauer">Dauer in Minuten</label>: <input name="dauer" id="dauer" type="number" min="{{.MinuteGranularity}}" max="120" step="{{.MinuteGranularity}}" value="{{.Duration}}" required/><br />
+  <label for="raum">Raum</label>:
+  <select name="raum" id="raum">
+    {{range $room := .Rooms}}
+    <option value="{{$room.Id}}"{{if eq $room.Id $.SelectedRoom}} selected{{end}}>{{$room.Name}}</option>
+    {{end}}
+  </select><br />
+  <label for="raumname">Raumname (für Sonderräume)</label>: <input type="text" name="raumname" id="raumname" value="{{.Roomname}}"/><br />
+  <label for="name">Name</label>: <input name="name" id="name" type="text" size="50" value="{{.Name}}" required/><br />
+  <label for="email">Email-Adresse</label>:
+  <input name="email" id="email" type="email" size="50" value="{{.Email}}" required/><br />
+  <label for="info">Info</label>: <input name="info" id="info" type="text" size="50" value="{{.Info}}"/><br />
+  <input type="submit">
+</form>
+{{if ne .Config.Tutor.MailSuffix ""}}
+Du musst hier eine Email-Adresse angeben, die auf „{{.Config.Tutor.MailSuffix}}“ endet.<br />
+{{end}}
+Außerdem dürfen in Räumen nur begrenzt viele Sprechstunden gleichzeitig stattfinden, nämlich
+<dl>
+  {{range $room := .Rooms}}
+  <dt>{{$room.Name}}</dt>
+  <dd>{{$room.MaxOccupy}} Sprechstunde{{if gt $room.MaxOccupy 1}}n{{end}}</dd>
+  {{end}}
+</dl>
+{{end}}

templating/templates/addSuccess.html

@@ -0,0 +1,5 @@
+{{define "title"}}Sprechstunde anlegen{{end}}
+
+{{define "content"}}
+Die Sprechstunde wurde angelegt. Du solltest eine Mail mit einem Aktivierungslink erhalten haben.
+{{end}}

templating/templates/base.html

@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html lang="de">
+<head>
+  <meta charset="UTF-8">
+  <meta name="keywords" content="Mathebau, Sprechstunde, Sprechstunden, Mathe, Mathematik, technische, Universität, Darmstadt, TU, Fachschaft">
+  <meta name="description" content="Eine Übersicht der Sprechstunden, die in den offenen Arbeitsräumen der Fachschaft Mathematik, TU Darmstadt, angeboten werden">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+  <link rel="stylesheet" href="/static/bootstrap/css/bootstrap.min.css">
+
+  <title>{{block "title" .}}Start{{end}} – Sprechstunden</title>
+</head>
+<body>
+  <div class="container">
+    {{block "content" .}}Du solltest dies nicht sehen.{{end}}
+  </div>
+
+  <footer class="container">
+    <a href="/">Startseite</a><br />
+    <a href="/addOfficeHour">Sprechstunde anlegen</a><br />
+    <a href="/deleteOfficeHour">Sprechstunde löschen</a><br />
+    Technische Fragen an <a href="mailto:sprechstundentool@mathebau.de">sprechstundentool@mathebau.de</a>
+  </footer>
+
+  <script src="/static/bootstrap/js/bootstrap.bundle.min.js"></script>
+</body>
+</html>

templating/templates/deleteSuccess.html

@@ -0,0 +1,7 @@
+{{define "title"}}Sprechstunde löschen{{end}}
+
+{{define "content"}}
+Du solltest eine Mail mit einem Bestätigungslink erhalten haben. <br />
+Sie wurde an die Adresse geschickt, mit der die Sprechstunde angelegt wurde.
+<br />
+{{end}}

templating/templates/executeFailure.html

@@ -0,0 +1,7 @@
+{{define "title"}}Anfrage ausführen fehlgeschlagen{{end}}
+
+{{define "content"}}
+Irgendetwas ist schief gegangen. Bitte sende folgende Daten an <a href="mailto:sprechstundentool@mathebau.de">sprechstundentool@mathebau.de</a> mit einer Beschreibung, was du tun wolltest.
+<br />
+{{.}}
+{{end}}

templating/templates/executeSuccess.html

@@ -0,0 +1,5 @@
+{{define "title"}}Anfrage ausgeführt{{end}}
+
+{{define "content"}}
+Deine Anfrage wurde ausgeführt.
+{{end}}

templating/templates/index.html

@@ -0,0 +1,25 @@
+{{define "title"}}Übersicht{{end}}
+
+{{define "content"}}
+<form method="GET" action="/getByCourse">
+  <label for="veranstaltung">Veranstaltung: </label>
+  <select name="veranstaltung" id="veranstaltung" size="1" onchange="document.forms[0].submit()">
+    <option value="">Alle</option>
+    {{range $course := .Courses}}
+    <option value="{{$course.Id}}"{{if eq $course.Id $.SelectedCourse}} selected{{end}}>{{$course.Name}}</option>
+    {{end}}
+  </select>
+  <input type="submit" value="Auswählen" />
+</form>
+<form method="GET" action="/getByRoom">
+  <label for="raum">Raum: </label>
+  <select name="raum" id="raum" size="1" onchange="document.forms[1].submit()">
+    <option value="">Alle</option>
+    {{range $room := .Rooms}}
+    <option value="{{$room.Id}}"{{if eq $room.Id $.SelectedRoom}} selected{{end}}>{{$room.Name}}</option>
+    {{end}}
+  </select>
+  <input type="submit" value="Auswählen" />
+</form>
+{{.Timetable}}
+{{end}}

templating/templates/requestNotFound.html

@@ -0,0 +1,12 @@
+{{define "title"}}Anfrage bestätigen fehlgeschlagen{{end}}
+
+{{define "content"}}
+<p>
+  Dieser Bestätigungscode ist nicht verfügbar. <br />
+  Bitte gib deinen Bestätigungscode hier ein.
+</p>
+<form action="/confirmRequest">
+  <label for="code">Bestätigungscode</label>: <input type="text" name="code" id="code"/>
+  <input type="submit" />
+</form>
+{{end}}