Add localised server information to each page

src/main.go

@@ -6,6 +6,7 @@ import (
 	"html/template"
 	"log"
 	"net/http"
+	"os"
 	"regexp"
 	"strconv"
 	"strings"
@@ -14,25 +15,41 @@ import (
 //go:embed templates/*.html
 var templatesFS embed.FS
 
-//go:embed static/*
-var staticFiles embed.FS
-
 type ErrorPageData struct {
 	StatusCode  int
 	Title       string
 	Description string
+	ServerName  string
+	ServerFlag  string
 }
 
 type NonErrorPageData struct {
-	Hostname string
+	Hostname   string
+	ServerName string
+	ServerFlag string
 }
 
+var (
+	serverName string
+	serverFlag string
+)
+
 func main() {
 	tmpl, err := template.ParseFS(templatesFS, "templates/*.html")
 	if err != nil {
 		log.Fatalf("Failed to parse templates: %v", err)
 	}
 
+	serverName = os.Getenv("SERVER_NAME")
+	if serverName == "" {
+		serverName = "unknown-server"
+	}
+
+	serverFlag = os.Getenv("SERVER_FLAG")
+	if serverFlag == "" {
+		serverFlag = "🇬🇧"
+	}
+
 	http.HandleFunc("/", defaultHandler(tmpl))
 
 	http.HandleFunc("/error/", errorHandler(tmpl))
@@ -48,7 +65,9 @@ func defaultHandler(tmpl *template.Template) http.HandlerFunc {
 		hostname := r.Host
 
 		data := NonErrorPageData{
-			Hostname: hostname,
+			Hostname:   hostname,
+			ServerName: serverName,
+			ServerFlag: serverFlag,
 		}
 
 		w.WriteHeader(http.StatusNotFound)
@@ -67,7 +86,9 @@ func maintenanceHandler(tmpl *template.Template) http.HandlerFunc {
 		hostname := r.Host
 
 		data := NonErrorPageData{
-			Hostname: hostname,
+			Hostname:   hostname,
+			ServerName: serverName,
+			ServerFlag: serverFlag,
 		}
 
 		w.WriteHeader(http.StatusServiceUnavailable)
@@ -117,6 +138,8 @@ func errorHandler(tmpl *template.Template) http.HandlerFunc {
 			StatusCode:  statusCode,
 			Title:       msg.Title,
 			Description: msg.Description,
+			ServerName:  serverName,
+			ServerFlag:  serverFlag,
 		}
 
 		w.WriteHeader(data.StatusCode)

src/templates/default.html

@@ -49,11 +49,19 @@ html, body {
 
 .error-message p {
   font-size: 1rem;
-  margin-bottom: 1.5rem;
   color: #495057;
   line-height: 1.4;
 }
 
+.server-footer {
+  margin-top: 1.5rem;
+  font-size: 0.8rem;
+  color: #8c9ba5;
+  border-top: 1px solid #eef2f5;
+  padding-top: 1rem;
+  user-select: none;
+}
+
 .btn {
   display: inline-block;
   padding: 0.6rem 1.6rem;
@@ -83,6 +91,9 @@ html, body {
           No website exists at {{ .Hostname }}.  Check the address and try again.
         </p>
     </div>
+    <footer class="server-footer">
+      Served by {{ .ServerFlag }} {{ .ServerName }}
+    </footer>
   </main>
 </body>
 </html>

src/templates/error.html

@@ -54,6 +54,15 @@ html, body {
   line-height: 1.4;
 }
 
+.server-footer {
+  margin-top: 1.5rem;
+  font-size: 0.8rem;
+  color: #8c9ba5;
+  border-top: 1px solid #eef2f5;
+  padding-top: 1rem;
+  user-select: none;
+}
+
 .btn {
   display: inline-block;
   padding: 0.6rem 1.6rem;
@@ -84,7 +93,9 @@ html, body {
         </p>
       <a href="/" class="btn">Return to Homepage</a>
     </div>
+    <footer class="server-footer">
+      Served by {{ .ServerFlag }} {{ .ServerName }}
+    </footer>
   </main>
 </body>
-</html>
-
+</html>

src/templates/maintenance.html

@@ -50,11 +50,19 @@ html, body {
 
 .error-message p {
   font-size: 1rem;
-  margin-bottom: 1.5rem;
   color: #495057;
   line-height: 1.4;
 }
 
+.server-footer {
+  margin-top: 1.5rem;
+  font-size: 0.8rem;
+  color: #8c9ba5;
+  border-top: 1px solid #eef2f5;
+  padding-top: 1rem;
+  user-select: none;
+}
+
 .btn {
   display: inline-block;
   padding: 0.6rem 1.6rem;
@@ -84,7 +92,9 @@ html, body {
           {{ .Hostname }} is under scheduled maintenance.  Check back later.
         </p>
     </div>
+    <footer class="server-footer">
+      Served by {{ .ServerFlag }} {{ .ServerName }}
+    </footer>
   </main>
 </body>
-</html>
-
+</html>