feat: JSON Configuration File

Added support for a JSON configuration file to configure ceterin aspects
of the website without having to modify the Go code.

2 files changed, 58 insertions, 17 deletions

diff --git a/config.json b/config.json
new file mode 100644
index 0000000..fe38b72
--- /dev/null
+++ b/config.json
@@ -0,0 +1,19 @@
+{
+    "port" : "8000",
+    "allowed" : [
+		"static/rss.xml",
+		"static/card",
+		"static/css/main.css",
+		"static/logos/FirstInitialLogo.svg",
+		"static/logos/FullNameLogo.svg",
+		"static/logos/favicon.png",
+		"static/logos/favicon.svg",
+		"static/logos/favicon16.png",
+		"static/logos/favicon32.png",
+		"static/robots.txt",
+		"static/home.md"
+    ],
+    "HomeHtml": "static/home.md",
+    "MainTemplate" : "templates/template.html",
+    "ErrorTemplate" : "templates/error.html"
+}
diff --git a/main.go b/main.go
index 7fd73d2..6f2ae77 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
 	"github.com/gomarkdown/markdown"
 	"github.com/gomarkdown/markdown/html"
@@ -13,6 +14,16 @@ import (
 	"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())
 
@@ -21,9 +32,9 @@ func GetHome(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	t := template.Must(template.ParseFiles("templates/template.html"))
+	t := template.Must(template.ParseFiles(config.MainTemplate))
 
-	html, err := MarkdownToHTML("static/home.md")
+	html, err := MarkdownToHTML(config.HomeHtml)
 	if err != nil {
 		ErrorPage(w, "Internal Server Error", 500)
 	} else {
@@ -35,20 +46,7 @@ func GetFiles(w http.ResponseWriter, r *http.Request) {
 	log.Println("Request for:", r.URL.String())
 	url := fmt.Sprintf("static%s", r.URL.String())
 
-	allowed := []string{
-		"static/rss.xml",
-		"static/card",
-		"static/css/main.css",
-		"static/logos/FirstInitialLogo.svg",
-		"static/logos/FullNameLogo.svg",
-		"static/logos/favicon.png",
-		"static/logos/favicon.svg",
-		"static/logos/favicon16.png",
-		"static/logos/favicon32.png",
-		"static/robots.txt",
-	}
-
-	if slices.Contains(allowed, url) {
+	if slices.Contains(config.Allowed, url) {
 		http.ServeFile(w, r, url)
 	} else {
 		ErrorPage(w, "Page Not Found.", 404)
@@ -81,7 +79,7 @@ func MarkdownToHTML(path string) (string, error) {
 
 func ErrorPage(w http.ResponseWriter, message string, code int) {
 	log.Println(code, message)
-	t := template.Must(template.ParseFiles("templates/error.html"))
+	t := template.Must(template.ParseFiles(config.ErrorTemplate))
 	t.Execute(w, struct {
 		Code    int
 		Message string
@@ -96,6 +94,7 @@ func Usage() {
 }
 
 func main() {
+	portFlagSet := false
 	port := ":8000"
 
 	for i := 1; i < len(os.Args); i++ {
@@ -104,6 +103,7 @@ func main() {
 			if i+1 >= len(os.Args) {
 				Usage()
 			} else {
+				portFlagSet = true
 				port = ":" + os.Args[i+1]
 				i++
 			}
@@ -113,6 +113,28 @@ func main() {
 		}
 	}
 
+	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)