Allow proxyURL to contain a path.

We now support or reasonable values for proxyURL, such as "http:"
or "/galene".

README

@@ -78,7 +78,7 @@ The fields are as follows:
   allowed.  This is safe if the server is on the public Internet, but not
   necessarily so if it is on a private network.
 - `proxyURL`: if running behind a reverse proxy, this specifies the
-  address of the proxy.
+  root URL that will be visible outside the proxy.
 - `canonicalHost`: the canonical name of the host running the server; this
   will cause clients to be redirected if they use a different hostname to
   access the server.

group/group.go

@@ -917,7 +917,6 @@ func GetConfiguration() (*Configuration, error) {
 	return configuration.configuration, nil
 }
 
-
 // called locked
 func (g *Group) getPasswordPermission(creds ClientCredentials) ([]string, error) {
 	desc := g.description
@@ -1051,7 +1050,7 @@ type Status struct {
 // Status returns a group's status.
 // Base is the base URL for groups; if omitted, then both the Location and
 // Endpoint members are omitted from the result.
-func (g *Group) Status(authentified bool, base string) Status {
+func (g *Group) Status(authentified bool, base *url.URL) Status {
 	desc := g.Description()
 
 	if desc.Redirect != "" {
@@ -1064,28 +1063,25 @@ func (g *Group) Status(authentified bool, base string) Status {
 	}
 
 	var location, endpoint string
-	if base != "" {
-		burl, err := url.Parse(base)
-		if err == nil {
+	if base != nil {
 		wss := "wss"
-			if burl.Scheme == "http" {
+		if base.Scheme == "http" {
 			wss = "ws"
 		}
 		l := url.URL{
-				Scheme: burl.Scheme,
-				Host:   burl.Host,
-				Path:   path.Join(burl.Path, g.name) + "/",
+			Scheme: base.Scheme,
+			Host:   base.Host,
+			Path: path.Join(
+				path.Join(base.Path, "/group/"),
+				g.Name()) + "/",
 		}
 		location = l.String()
 		e := url.URL{
 			Scheme: wss,
-				Host:   burl.Host,
-				Path:   "/ws",
+			Host:   base.Host,
+			Path:   path.Join(base.Path, "/ws"),
 		}
 		endpoint = e.String()
-		} else {
-			log.Printf("Couldn't parse base URL %v", base)
-		}
 	}
 
 	d := Status{
@@ -1108,7 +1104,7 @@ func (g *Group) Status(authentified bool, base string) Status {
 	return d
 }
 
-func GetPublic(base string) []Status {
+func GetPublic(base *url.URL) []Status {
 	gs := make([]Status, 0)
 	Range(func(g *Group) bool {
 		if g.Description().Public {

group/group_test.go

@@ -42,7 +42,7 @@ func TestGroup(t *testing.T) {
 		t.Errorf("Expected [], got %v", subs)
 	}
 
-	if public := GetPublic(""); len(public) != 1 || public[0].Name != "group/subgroup" {
+	if public := GetPublic(nil); len(public) != 1 || public[0].Name != "group/subgroup" {
 		t.Errorf("Expected group/subgroup, got %v", public)
 	}
 }

rtpconn/webclient.go

@@ -1161,7 +1161,7 @@ func handleAction(c *webClient, a any) error {
 		if a.group != "" {
 			g = group.Get(a.group)
 			if g != nil {
-				s := g.Status(true, "")
+				s := g.Status(true, nil)
 				status = &s
 				data = g.Data()
 			}
@@ -1208,7 +1208,7 @@ func handleAction(c *webClient, a any) error {
 			return errors.New("Permissions changed in no group")
 		}
 		perms := append([]string(nil), c.permissions...)
-		status := g.Status(true, "")
+		status := g.Status(true, nil)
 		username := c.username
 		c.write(clientMessage{
 			Type:             "joined",

webserver/webserver.go

@@ -361,29 +361,44 @@ func groupHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	status := g.Status(false, "")
+	status := g.Status(false, nil)
 	cspHeader(w, status.AuthServer)
 	serveFile(w, r, filepath.Join(StaticRoot, "galene.html"))
 }
 
-func groupBase(r *http.Request) (string, error) {
+func baseURL(r *http.Request) (*url.URL, error) {
 	conf, err := group.GetConfiguration()
 	if err != nil {
-		return "", err
+		return nil, err
 	}
+	var pu *url.URL
 	if conf.ProxyURL != "" {
-		return url.JoinPath(conf.ProxyURL, "/group/")
+		pu, err = url.Parse(conf.ProxyURL)
+		if err != nil {
+			return nil, err
+		}
 	}
 	scheme := "https"
 	if r.TLS == nil {
 		scheme = "http"
 	}
+	host := r.Host
+	path := ""
+	if pu != nil {
+		if pu.Scheme != "" {
+			scheme = pu.Scheme
+		}
+		if pu.Host != "" {
+			host = pu.Host
+		}
+		path = pu.Path
+	}
 	base := url.URL{
 		Scheme: scheme,
-		Host:   r.Host,
-		Path:   "/group/",
+		Host:   host,
+		Path:   path,
 	}
-	return base.String(), nil
+	return &base, nil
 }
 
 func groupStatusHandler(w http.ResponseWriter, r *http.Request) {
@@ -404,9 +419,11 @@ func groupStatusHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	base, err := groupBase(r)
+	base, err := baseURL(r)
 	if err != nil {
-		httpError(w, err)
+		log.Printf("Parse ProxyURL: %v", err)
+		http.Error(w, "Internal server error",
+			http.StatusInternalServerError)
 		return
 	}
 	d := g.Status(false, base)
@@ -422,7 +439,7 @@ func groupStatusHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func publicHandler(w http.ResponseWriter, r *http.Request) {
-	base, err := groupBase(r)
+	base, err := baseURL(r)
 	if err != nil {
 		log.Printf("couldn't determine group base: %v", err)
 		httpError(w, err)

webserver/webserver_test.go

@@ -42,12 +42,18 @@ func TestBase(t *testing.T) {
 		t      bool
 		h, res string
 	}{
-		{"", true, "a.org", "https://a.org/group/"},
-		{"", false, "a.org", "http://a.org/group/"},
-		{"https://b.org", true, "a.org", "https://b.org/group/"},
-		{"https://b.org", false, "a.org", "https://b.org/group/"},
-		{"http://b.org", true, "a.org", "http://b.org/group/"},
-		{"http://b.org", false, "a.org", "http://b.org/group/"},
+		{"", true, "a.org", "https://a.org"},
+		{"", false, "a.org", "http://a.org"},
+		{"/base", true, "a.org", "https://a.org/base"},
+		{"/base", false, "a.org", "http://a.org/base"},
+		{"http:", true, "a.org", "http://a.org"},
+		{"https:", false, "a.org", "https://a.org"},
+		{"http:/base", true, "a.org", "http://a.org/base"},
+		{"https:/base", false, "a.org", "https://a.org/base"},
+		{"https://b.org", true, "a.org", "https://b.org"},
+		{"https://b.org", false, "a.org", "https://b.org"},
+		{"http://b.org", true, "a.org", "http://b.org"},
+		{"http://b.org", false, "a.org", "http://b.org"},
 	}
 
 	dir := t.TempDir()
@@ -75,13 +81,13 @@ func TestBase(t *testing.T) {
 		if v.t {
 			tcs = &tls.ConnectionState{}
 		}
-		base, err := groupBase(&http.Request{
+		base, err := baseURL(&http.Request{
 			TLS:  tcs,
 			Host: v.h,
 		})
-		if err != nil || base != v.res {
+		if err != nil || base.String() != v.res {
 			t.Errorf("Expected %v, got %v (%v)",
-				v.res, base, err,
+				v.res, base.String(), err,
 			)
 		}
 	}