Initial commit

handler.go

@@ -0,0 +1,196 @@
+package main
+
+import (
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+	"strings"
+)
+
+func baseLoadTemplate(base string, path string) (*template.Template, any) {
+	return template.New(base).ParseFiles(
+		"./views/"+base,
+		"./views/"+path,
+		"./views/partials/header.html",
+	)
+}
+
+func loadTemplate(path string) (*template.Template, any) {
+	return baseLoadTemplate("layout.html", path)
+}
+
+func LoadView(writer http.ResponseWriter, path string, data interface{}) {
+	tmpl, err := loadTemplate(path)
+	if err != nil {
+		fmt.Printf("Failed to load view %s\n", path)
+		fmt.Println(err)
+		if path == "500.html" {
+			writer.Write([]byte("<h1>Failed to load 500.html check console for more info</h1>"))
+		} else {
+			LoadView(writer, "500.html", nil)
+		}
+		return
+	}
+
+	if err := tmpl.Execute(writer, data); err != nil {
+		fmt.Printf("Failed to load view %s\n", path)
+		fmt.Println(err)
+		writer.WriteHeader(http.StatusInternalServerError)
+		if path == "500.html" {
+			writer.Write([]byte("<h1>Failed to load 500.html check console for more info</h1>"))
+		} else {
+			LoadView(writer, "500.html", nil)
+		}
+		return
+	}
+}
+
+/** Only returns the html without template */
+func LoadHtml(writer http.ResponseWriter, path string, data interface{}) {
+	tmpl, err := baseLoadTemplate("html.html", path)
+	if err != nil {
+		fmt.Printf("Failed to load template %s\n", path)
+		fmt.Println(err)
+		writer.WriteHeader(http.StatusInternalServerError)
+		if path == "500.html" {
+			writer.Write([]byte("<h1>Failed to load 500.html check console for more info</h1>"))
+		} else {
+			LoadHtml(writer, "500.html", nil)
+		}
+		return
+	}
+
+	if err := tmpl.Execute(writer, data); err != nil {
+		fmt.Printf("Failed to execute template %s\n", path)
+		fmt.Println(err)
+		writer.WriteHeader(http.StatusInternalServerError)
+		if path == "500.html" {
+			writer.Write([]byte("<h1>Failed to load 500.html check console for more info</h1>"))
+		} else {
+			LoadHtml(writer, "500.html", nil)
+		}
+		return
+	}
+}
+
+type Error struct {
+	code int
+	msg  *string
+}
+
+type AnswerType int
+
+const (
+	NORMAL AnswerType = iota
+	HTML
+	JSON
+	HTMLFULL
+)
+
+func LoadBasedOnAnswer(ans AnswerType, w http.ResponseWriter, path string, data map[string]interface{}) {
+	if ans == NORMAL {
+		LoadView(w, path, nil)
+		return
+	} else if ans == HTML {
+		LoadHtml(w, path, nil)
+		return
+	} else if ans == HTMLFULL {
+		if data == nil {
+			LoadHtml(w, path, map[string]interface{}{
+				"App": true,
+			})
+		} else {
+			data["App"] = true
+			LoadHtml(w, path, data)
+		}
+		return
+	} else if ans == JSON {
+		panic("TODO JSON!")
+	} else {
+		panic("unreachable")
+	}
+
+}
+
+type Handler interface {
+	New()
+	Startup()
+	Get(fn func(mode AnswerType, w http.ResponseWriter, r *http.Request) *Error)
+}
+
+type Handle struct{}
+
+func handleError(err *Error, answerType AnswerType, w http.ResponseWriter) {
+	if err != nil {
+		w.WriteHeader(err.code)
+		if err.code == 404 {
+            LoadBasedOnAnswer(answerType, w, "404.html", nil)
+			return
+		}
+		if err.msg != nil {
+			w.Write([]byte(*err.msg))
+		}
+	}
+}
+
+func (x Handle) Get(path string, fn func(mode AnswerType, w http.ResponseWriter, r *http.Request) *Error) {
+	http.HandleFunc("/"+path, func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "Get" {
+			header := r.Header.Get("REQUEST-TYPE")
+			if header == "html" {
+				handleError(fn(HTMLFULL, w, r), HTMLFULL, w)
+				return
+			}
+			handleError(fn(NORMAL, w, r), NORMAL, w)
+		}
+	})
+	http.HandleFunc("/api/html/"+path, func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "Get" {
+			handleError(fn(HTML, w, r), HTML, w)
+		}
+	})
+	http.HandleFunc("/api/json/"+path, func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "Get" {
+			handleError(fn(JSON, w, r), JSON, w)
+		}
+	})
+}
+
+func (x Handle) New() {
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/" {
+			w.WriteHeader(http.StatusNotFound)
+			LoadView(w, "404.html", nil)
+			return
+		}
+		LoadView(w, "index.html", nil)
+	})
+
+	http.HandleFunc("/styles/", func(w http.ResponseWriter, r *http.Request) {
+		path := r.URL.Path[len("/styles/"):]
+		if !strings.HasSuffix(path, ".css") {
+			w.WriteHeader(http.StatusNotFound)
+			w.Write([]byte("File not found"))
+			return
+		}
+
+		t, err := template.ParseFiles("./views/styles/" + path)
+
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte("Failed to load template"))
+			fmt.Println("Error:")
+			fmt.Println(err)
+			return
+		}
+
+		w.Header().Set("Content-Type", "text/css; charset=utf-8")
+		t.Execute(w, nil)
+	})
+}
+
+func (x Handle) Startup() {
+	fmt.Printf("Starting up!\n")
+	log.Fatal(http.ListenAndServe(":8000", nil))
+}