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package main
import (
"encoding/json"
"fmt"
"github.com/gomarkdown/markdown"
"github.com/gomarkdown/markdown/html"
"github.com/gomarkdown/markdown/parser"
"html/template"
"io"
"log"
"net/http"
"os"
"slices"
)
type Config struct {
Port string
Allowed []string
HomeHtml string
MainTemplate string
ErrorTemplate string
}
var config Config
func GetHome(w http.ResponseWriter, r *http.Request) {
log.Println("Request for:", r.URL.String())
if r.URL.String() != "/" {
ErrorPage(w, "Page Not Found.", 404)
return
}
t := template.Must(template.ParseFiles(config.MainTemplate))
html, err := MarkdownToHTML(config.HomeHtml)
if err != nil {
ErrorPage(w, "Internal Server Error", 500)
} else {
t.Execute(w, template.HTML(html))
}
}
func GetFiles(w http.ResponseWriter, r *http.Request) {
log.Println("Request for:", r.URL.String())
url := fmt.Sprintf("static%s", r.URL.String())
if slices.Contains(config.Allowed, url) {
http.ServeFile(w, r, url)
} else {
ErrorPage(w, "Page Not Found.", 404)
}
}
func MarkdownToHTML(path string) (string, error) {
extensions := parser.CommonExtensions | parser.AutoHeadingIDs | parser.NoEmptyLineBeforeBlock
p := parser.NewWithExtensions(extensions)
f, err := os.Open(path)
if err != nil {
return "", err
}
defer f.Close()
md, err := io.ReadAll(f)
if err != nil {
return "", err
}
doc := p.Parse(md)
htmlFlags := html.CommonFlags | html.HrefTargetBlank
opts := html.RendererOptions{Flags: htmlFlags}
renderer := html.NewRenderer(opts)
return string(markdown.Render(doc, renderer)), nil
}
func ErrorPage(w http.ResponseWriter, message string, code int) {
log.Println(code, message)
t := template.Must(template.ParseFiles(config.ErrorTemplate))
t.Execute(w, struct {
Code int
Message string
}{
Code: code,
Message: message,
})
}
func Usage() {
fmt.Fprintf(os.Stderr, "%s [--port port]\n", os.Args[0])
}
func main() {
portFlagSet := false
port := ":8000"
for i := 1; i < len(os.Args); i++ {
switch os.Args[i] {
case "--port":
if i+1 >= len(os.Args) {
Usage()
} else {
portFlagSet = true
port = ":" + os.Args[i+1]
i++
}
default:
log.Println("Unknown option: ", os.Args[i])
Usage()
}
}
configJson, err := os.ReadFile("config.json")
if err != nil {
panic(err)
}
err = json.Unmarshal(configJson, &config)
if err != nil {
panic(err)
}
if !portFlagSet {
port = ":" + config.Port
}
fmt.Println(config.Port)
for i, a := range config.Allowed {
fmt.Printf("%d: %s\n", i, a)
}
fmt.Println(config.HomeHtml)
fmt.Println(config.MainTemplate)
fmt.Println(config.ErrorTemplate)
http.HandleFunc("/robots.txt", GetFiles)
http.HandleFunc("/rss.xml", GetFiles)
http.HandleFunc("/card", GetFiles)
http.HandleFunc("/css/", GetFiles)
http.HandleFunc("/logos/", GetFiles)
http.HandleFunc("/", GetHome)
log.Fatal(http.ListenAndServe(port, nil))
}
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