feat: sync chatlist sharing support

internal/links/links.go

@@ -0,0 +1,94 @@
+package links
+
+import (
+	"net/url"
+	"strings"
+)
+
+const DefaultPublicBaseURL = "https://telesrv.net"
+const MaxChatlistSlugBytes = 128
+
+func NormalizeBaseURL(raw string) string {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		raw = DefaultPublicBaseURL
+	}
+	if !strings.Contains(raw, "://") {
+		raw = "https://" + raw
+	}
+	return strings.TrimRight(raw, "/")
+}
+
+func Build(baseURL, path string, query url.Values) string {
+	baseURL = NormalizeBaseURL(baseURL)
+	parsed, err := url.Parse(baseURL)
+	if err != nil || parsed.Scheme == "" || parsed.Host == "" {
+		baseURL = DefaultPublicBaseURL
+		parsed, _ = url.Parse(baseURL)
+	}
+	basePath := strings.TrimRight(parsed.Path, "/")
+	path = strings.TrimLeft(path, "/")
+	if path != "" {
+		parsed.Path = basePath + "/" + path
+	} else if basePath != "" {
+		parsed.Path = basePath
+	}
+	parsed.RawQuery = query.Encode()
+	return parsed.String()
+}
+
+func Host(baseURL string) string {
+	parsed, err := url.Parse(NormalizeBaseURL(baseURL))
+	if err != nil || parsed.Host == "" {
+		return "telesrv.net"
+	}
+	if host := parsed.Hostname(); host != "" {
+		return host
+	}
+	return parsed.Host
+}
+
+func CleanChatlistSlug(raw string) string {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return ""
+	}
+	if strings.Contains(raw, "://") {
+		if parsed, err := url.Parse(raw); err == nil {
+			if slug := parsed.Query().Get("slug"); slug != "" {
+				raw = slug
+			} else {
+				raw = strings.Trim(parsed.Path, "/")
+			}
+		}
+	}
+	raw = strings.TrimPrefix(raw, "addlist/")
+	raw = strings.Trim(raw, "/")
+	if idx := strings.LastIndex(raw, "/"); idx >= 0 {
+		raw = raw[idx+1:]
+	}
+	if idx := strings.IndexAny(raw, "?#"); idx >= 0 {
+		raw = raw[:idx]
+	}
+	if decoded, err := url.PathUnescape(raw); err == nil {
+		raw = decoded
+	}
+	return raw
+}
+
+func ValidChatlistSlug(slug string) bool {
+	if slug == "" || len(slug) > MaxChatlistSlugBytes {
+		return false
+	}
+	for _, r := range slug {
+		switch {
+		case r >= 'a' && r <= 'z':
+		case r >= 'A' && r <= 'Z':
+		case r >= '0' && r <= '9':
+		case r == '_' || r == '-' || r == '.':
+		default:
+			return false
+		}
+	}
+	return true
+}

internal/links/links_test.go

@@ -0,0 +1,70 @@
+package links
+
+import (
+	"net/url"
+	"testing"
+)
+
+func TestNormalizeBaseURL(t *testing.T) {
+	tests := []struct {
+		name string
+		raw  string
+		want string
+	}{
+		{name: "default", raw: "", want: "https://telesrv.net"},
+		{name: "host only", raw: "telesrv.net/", want: "https://telesrv.net"},
+		{name: "local http", raw: "http://127.0.0.1:2401/", want: "http://127.0.0.1:2401"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := NormalizeBaseURL(tt.raw); got != tt.want {
+				t.Fatalf("NormalizeBaseURL(%q) = %q, want %q", tt.raw, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestBuildPreservesBasePathAndQuery(t *testing.T) {
+	got := Build("http://127.0.0.1:2401/root/", "/call/abc", url.Values{"slug": []string{"abc"}})
+	if want := "http://127.0.0.1:2401/root/call/abc?slug=abc"; got != want {
+		t.Fatalf("Build = %q, want %q", got, want)
+	}
+}
+
+func TestBuildDoesNotDoubleEscapeBasePath(t *testing.T) {
+	got := Build("http://127.0.0.1:2401/root%20path/", "/addlist/slug", nil)
+	if want := "http://127.0.0.1:2401/root%20path/addlist/slug"; got != want {
+		t.Fatalf("Build encoded path = %q, want %q", got, want)
+	}
+}
+
+func TestHostDropsPort(t *testing.T) {
+	if got, want := Host("http://127.0.0.1:2401"), "127.0.0.1"; got != want {
+		t.Fatalf("Host = %q, want %q", got, want)
+	}
+}
+
+func TestCleanAndValidateChatlistSlug(t *testing.T) {
+	tests := []struct {
+		name  string
+		raw   string
+		clean string
+		valid bool
+	}{
+		{name: "raw", raw: "abc.DEF-12", clean: "abc.DEF-12", valid: true},
+		{name: "public url", raw: "http://127.0.0.1:2401/addlist/abc-12?x=1", clean: "abc-12", valid: true},
+		{name: "app url", raw: "telesrv://addlist?slug=abc_12", clean: "abc_12", valid: true},
+		{name: "bad char", raw: "abc/../bad!", clean: "bad!", valid: false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := CleanChatlistSlug(tt.raw)
+			if got != tt.clean {
+				t.Fatalf("CleanChatlistSlug(%q) = %q, want %q", tt.raw, got, tt.clean)
+			}
+			if valid := ValidChatlistSlug(got); valid != tt.valid {
+				t.Fatalf("ValidChatlistSlug(%q) = %v, want %v", got, valid, tt.valid)
+			}
+		})
+	}
+}