feat: dynamic cookie domains (#722)

* feat: dynamic cookie domains

Replaces #685

I was having weird testing issues when trying to merge #685, so I
rewrote it from scratch to be a lot more minimal.

* chore: spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/http_test.go

@@ -7,11 +7,55 @@ import (
 	"github.com/TecharoHQ/anubis"
 )
 
+func TestSetCookie(t *testing.T) {
+	for _, tt := range []struct {
+		name       string
+		options    Options
+		host       string
+		cookieName string
+	}{
+		{
+			name:       "basic",
+			options:    Options{},
+			host:       "",
+			cookieName: anubis.CookieName,
+		},
+		{
+			name:       "domain techaro.lol",
+			options:    Options{CookieDomain: "techaro.lol"},
+			host:       "",
+			cookieName: anubis.WithDomainCookieName + "techaro.lol",
+		},
+		{
+			name:       "dynamic cookie domain",
+			options:    Options{CookieDynamicDomain: true},
+			host:       "techaro.lol",
+			cookieName: anubis.WithDomainCookieName + "techaro.lol",
+		},
+	} {
+		t.Run(tt.name, func(t *testing.T) {
+			srv := spawnAnubis(t, tt.options)
+			rw := httptest.NewRecorder()
+
+			srv.SetCookie(rw, srv.cookieName, "test", "/", tt.host)
+
+			resp := rw.Result()
+			cookies := resp.Cookies()
+
+			ckie := cookies[0]
+
+			if ckie.Name != tt.cookieName {
+				t.Errorf("wanted cookie named %q, got cookie named %q", tt.cookieName, ckie.Name)
+			}
+		})
+	}
+}
+
 func TestClearCookie(t *testing.T) {
 	srv := spawnAnubis(t, Options{})
 	rw := httptest.NewRecorder()
 
-	srv.ClearCookie(rw, srv.cookieName, "/")
+	srv.ClearCookie(rw, srv.cookieName, "/", "localhost")
 
 	resp := rw.Result()
 
@@ -36,7 +80,7 @@ func TestClearCookieWithDomain(t *testing.T) {
 	srv := spawnAnubis(t, Options{CookieDomain: "techaro.lol"})
 	rw := httptest.NewRecorder()
 
-	srv.ClearCookie(rw, srv.cookieName, "/")
+	srv.ClearCookie(rw, srv.cookieName, "/", "locahost")
 
 	resp := rw.Result()
 
@@ -56,3 +100,28 @@ func TestClearCookieWithDomain(t *testing.T) {
 		t.Errorf("wanted cookie max age of -1, got: %d", ckie.MaxAge)
 	}
 }
+
+func TestClearCookieWithDynamicDomain(t *testing.T) {
+	srv := spawnAnubis(t, Options{CookieDynamicDomain: true})
+	rw := httptest.NewRecorder()
+
+	srv.ClearCookie(rw, srv.cookieName, "/", "xeiaso.net")
+
+	resp := rw.Result()
+
+	cookies := resp.Cookies()
+
+	if len(cookies) != 1 {
+		t.Errorf("wanted 1 cookie, got %d cookies", len(cookies))
+	}
+
+	ckie := cookies[0]
+
+	if ckie.Name != anubis.WithDomainCookieName+"xeiaso.net" {
+		t.Errorf("wanted cookie named %q, got cookie named %q", srv.cookieName, ckie.Name)
+	}
+
+	if ckie.MaxAge != -1 {
+		t.Errorf("wanted cookie max age of -1, got: %d", ckie.MaxAge)
+	}
+}