Fix prefix URL routing by using URL encoding

- Replace slash-to-dash conversion with proper URL encoding
- Update handlePrefixDetail and handlePrefixDetailJSON to URL decode prefix parameter
- Update handleIPRedirect to URL encode the prefix in the redirect
- Add urlEncode template function for use in templates
- Update AS detail template to URL encode prefix links
- This properly handles the slash in CIDR notation (e.g., /prefix/192.168.1.0%2F24)

internal/server/handlers.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"net"
 	"net/http"
+	"net/url"
 	"runtime"
 	"strconv"
 	"time"
@@ -419,13 +420,21 @@ func (s *Server) handleASDetailJSON() http.HandlerFunc {
 // handlePrefixDetailJSON returns prefix details as JSON
 func (s *Server) handlePrefixDetailJSON() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		prefix := chi.URLParam(r, "prefix")
+		prefixParam := chi.URLParam(r, "prefix")
-		if prefix == "" {
+		if prefixParam == "" {
 			writeJSONError(w, http.StatusBadRequest, "Prefix parameter is required")
 
 			return
 		}
 
+		// URL decode the prefix parameter
+		prefix, err := url.QueryUnescape(prefixParam)
+		if err != nil {
+			writeJSONError(w, http.StatusBadRequest, "Invalid prefix parameter")
+
+			return
+		}
+
 		routes, err := s.db.GetPrefixDetails(prefix)
 		if err != nil {
 			if errors.Is(err, database.ErrNoRoute) {
@@ -520,13 +529,21 @@ func (s *Server) handleASDetail() http.HandlerFunc {
 // handlePrefixDetail returns a handler that serves the prefix detail HTML page
 func (s *Server) handlePrefixDetail() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		prefix := chi.URLParam(r, "prefix")
+		prefixParam := chi.URLParam(r, "prefix")
-		if prefix == "" {
+		if prefixParam == "" {
 			http.Error(w, "Prefix parameter is required", http.StatusBadRequest)
 
 			return
 		}
 
+		// URL decode the prefix parameter
+		prefix, err := url.QueryUnescape(prefixParam)
+		if err != nil {
+			http.Error(w, "Invalid prefix parameter", http.StatusBadRequest)
+
+			return
+		}
+
 		routes, err := s.db.GetPrefixDetails(prefix)
 		if err != nil {
 			if errors.Is(err, database.ErrNoRoute) {
@@ -642,7 +659,7 @@ func (s *Server) handleIPRedirect() http.HandlerFunc {
 			return
 		}
 
-		// Redirect to the prefix detail page
+		// Redirect to the prefix detail page (URL encode the prefix)
-		http.Redirect(w, r, "/prefix/"+asInfo.Prefix, http.StatusSeeOther)
+		http.Redirect(w, r, "/prefix/"+url.QueryEscape(asInfo.Prefix), http.StatusSeeOther)
 	}
 }

internal/templates/as_detail.html

@@ -178,7 +178,7 @@
                 <tbody>
                     {{range .IPv4Prefixes}}
                     <tr>
-                        <td><a href="/prefix/{{.Prefix}}" class="prefix-link">{{.Prefix}}</a></td>
+                        <td><a href="/prefix/{{.Prefix | urlEncode}}" class="prefix-link">{{.Prefix}}</a></td>
                         <td>/{{.MaskLength}}</td>
                         <td>{{.LastUpdated.Format "2006-01-02 15:04:05"}}</td>
                         <td class="age">{{.LastUpdated | timeSince}}</td>
@@ -207,7 +207,7 @@
                 <tbody>
                     {{range .IPv6Prefixes}}
                     <tr>
-                        <td><a href="/prefix/{{.Prefix}}" class="prefix-link">{{.Prefix}}</a></td>
+                        <td><a href="/prefix/{{.Prefix | urlEncode}}" class="prefix-link">{{.Prefix}}</a></td>
                         <td>/{{.MaskLength}}</td>
                         <td>{{.LastUpdated.Format "2006-01-02 15:04:05"}}</td>
                         <td class="age">{{.LastUpdated | timeSince}}</td>

internal/templates/templates.go

@@ -4,6 +4,7 @@ package templates
 import (
 	_ "embed"
 	"html/template"
+	"net/url"
 	"sync"
 	"time"
 )
@@ -78,6 +79,7 @@ func initTemplates() {
 	// Create common template functions
 	funcs := template.FuncMap{
 		"timeSince": timeSince,
+		"urlEncode": url.QueryEscape,
 	}
 
 	// Parse status template