Allow specifying display names for servers

README.md

@@ -130,6 +130,24 @@ You can use source IP restriction to increase security. You should also bind the
 
 ## Advanced Features
 
+### Display names
+
+The server parameter is composed of server name prefixes, separated by comma. It also supports an extended syntax: It allows to define display names for the user interface that are different from the actual server names.
+
+For instance, the two servers from the basic example can be displayed as "Gigs" and "Hostdare" using the following syntax (as known from email addresses):
+
+    ./frontend --servers="Gigs<gigsgigscloud>,Hostdare<hostdare>" --domain=dn42.lantian.pub
+
+### IP addresses
+
+You may also specify IP addresses as server names when no domain is specified. IPv6 link local addresses are supported, too.
+
+For example:
+
+    ./frontend --servers="Prod<prod.mydomain.local>,Test1<fd88:dead:beef::1>,Test2<fe80::c%wg0>" --domain=
+
+These three servers are displayed as "Prod", "Test1" and "Test2" in the user interface. 
+
 ### API
 
 The frontend provides an API for running BIRD/traceroute/whois queries.

frontend/bindata/templates/page.tpl

@@ -31,10 +31,10 @@
 				<a class="nav-link{{ if .AllServersLinkActive }} active{{ end }}"
 					href="/{{ $option }}/{{ .AllServersURL }}/{{ $target }}"> All Servers </a>
 			</li>
-			{{ range $k, $v := .Servers }}
+			{{ range $k, $v := .ServersEscaped }}
 			<li class="nav-item">
-				<a class="nav-link{{ if eq $server $k }} active{{ end }}"
+				<a class="nav-link{{ if eq $server $v }} active{{ end }}"
-					href="/{{ $option }}/{{ $k }}/{{ $target }}">{{ html $v }}</a>
+					href="/{{ $option }}/{{ $v }}/{{ $target }}">{{ html (index $.ServersDisplay $k) }}</a>
 			</li>
 			{{ end }}
 		</ul>

frontend/main.go

@@ -12,6 +12,7 @@ import (
 
 type settingType struct {
 	servers         []string
+	serversDisplay  []string
 	domain          string
 	proxyPort       int
 	whoisServer     string
@@ -82,8 +83,21 @@ func main() {
 		panic("no server set")
 	}
 
+	servers := strings.Split(*serversPtr, ",")
+	serversDisplay := strings.Split(*serversPtr, ",")
+
+	// Split server names of the form "DisplayName<Hostname>"
+	for i, server := range servers {
+		pos := strings.Index(server, "<")
+		if pos != -1 {
+			serversDisplay[i] = server[0:pos]
+			servers[i] = server[pos+1:len(server)-1]
+		}
+	}
+
 	setting = settingType{
-		strings.Split(*serversPtr, ","),
+		servers,
+		serversDisplay,
 		*domainPtr,
 		*proxyPortPtr,
 		*whoisPtr,

frontend/render.go

@@ -55,14 +55,16 @@ func renderPageTemplate(w http.ResponseWriter, r *http.Request, title string, co
 
 	split = strings.SplitN(path, "/", 3)
 
-	serversEscaped := map[string]string{}
+	serversEscaped := make([]string, len(setting.servers))
-	for _, v := range setting.servers {
+	for i, v := range setting.servers {
-		serversEscaped[url.PathEscape(v)] = v
+		serversEscaped[i] = url.PathEscape(v)
 	}
 
 	args := TemplatePage{
 		Options:              optionsMap,
-		Servers:              serversEscaped,
+		Servers:              setting.servers,
+		ServersEscaped:       serversEscaped,
+		ServersDisplay:       setting.serversDisplay,
 		AllServersLinkActive: strings.ToLower(split[1]) == strings.ToLower(strings.Join(setting.servers, "+")),
 		AllServersURL:        url.PathEscape(strings.Join(setting.servers, "+")),
 		IsWhois:              isWhois,

frontend/template.go

@@ -11,7 +11,9 @@ import (
 type TemplatePage struct {
 	// Global options
 	Options map[string]string
-	Servers map[string]string
+	Servers []string
+	ServersEscaped []string
+	ServersDisplay []string
 
 	// Parameters related to current request
 	AllServersLinkActive bool

frontend/webserver.go

@@ -95,9 +95,17 @@ func webBackendCommunicator(endpoint string, command string) func(w http.Respons
 				result = smartFormatter(response)
 			}
 
+			serverDisplay := servers[i]
+			for k, v := range setting.servers {
+				if servers[i] == v {
+					serverDisplay = setting.serversDisplay[k]
+					break
+				}
+			}
+
 			// render the bird result template
 			args := TemplateBird{
-				ServerName: servers[i],
+				ServerName: serverDisplay,
 				Target:     backendCommand,
 				Result:     result,
 			}