server and web app

apps/server/internal/collaboration/util.go

@@ -0,0 +1,71 @@
+package collaboration
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
+	"strings"
+	"time"
+)
+
+func randomID(prefix string) string {
+	buf := make([]byte, 12)
+	if _, err := rand.Read(buf); err != nil {
+		panic(err)
+	}
+	return prefix + ":" + hex.EncodeToString(buf)
+}
+
+func hashAnchor(text string) string {
+	normalized := strings.TrimSpace(text)
+	sum := sha256.Sum256([]byte(normalized))
+	return hex.EncodeToString(sum[:8])
+}
+
+func parseTime(raw string) (time.Time, error) {
+	if raw == "" {
+		return time.Time{}, nil
+	}
+	return time.Parse(time.RFC3339, raw)
+}
+
+func formatTime(t time.Time) string {
+	return t.UTC().Format(time.RFC3339)
+}
+
+func ptr[T any](v T) *T {
+	return &v
+}
+
+func nullString(s string) *string {
+	if s == "" {
+		return nil
+	}
+	return &s
+}
+
+func scanNullString(ns *string) string {
+	if ns == nil {
+		return ""
+	}
+	return *ns
+}
+
+func coalesceString(values ...string) string {
+	for _, v := range values {
+		if v != "" {
+			return v
+		}
+	}
+	return ""
+}
+
+func formatDocumentID(path string) string {
+	clean := strings.TrimPrefix(path, "/")
+	clean = strings.TrimSuffix(clean, ".md")
+	return "doc:" + clean
+}
+
+func documentPathFromID(id string) string {
+	return strings.TrimPrefix(id, "doc:")
+}