Initial import of map-asset-gateway

services/api-go/internal/basemap/manifest.go

@@ -0,0 +1,93 @@
+package basemap
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func LoadManifest(path string) (Manifest, error) {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return Manifest{}, err
+	}
+
+	var item Manifest
+	if err := json.Unmarshal(content, &item); err != nil {
+		return Manifest{}, fmt.Errorf("decode manifest %s: %w", path, err)
+	}
+
+	item.Code = normalizeCode(item.Code)
+	item.Name = strings.TrimSpace(item.Name)
+	item.Type = defaultText(strings.TrimSpace(item.Type), "xyz")
+	item.Description = strings.TrimSpace(item.Description)
+	item.Version = strings.TrimSpace(item.Version)
+	item.Status = defaultText(strings.TrimSpace(item.Status), "ready")
+	item.TileFormat = normalizeTileFormat(item.TileFormat)
+	item.TileScheme = defaultText(strings.TrimSpace(item.TileScheme), "xyz")
+	item.Attribution = strings.TrimSpace(item.Attribution)
+	item.RootPath = strings.TrimSpace(item.RootPath)
+	if item.RootPath == "" {
+		item.RootPath = "tiles"
+	}
+	if item.MaxZoom < item.MinZoom {
+		return Manifest{}, fmt.Errorf("manifest %s has invalid zoom range", path)
+	}
+	if len(item.BBox) != 0 && len(item.BBox) != 4 {
+		return Manifest{}, fmt.Errorf("manifest %s has invalid bbox", path)
+	}
+	if item.Code == "" {
+		return Manifest{}, fmt.Errorf("manifest %s missing code", path)
+	}
+	if item.Name == "" {
+		item.Name = item.Code
+	}
+	if item.Version == "" {
+		item.Version = filepath.Base(filepath.Dir(path))
+	}
+	if item.Metadata == nil {
+		item.Metadata = map[string]any{}
+	}
+	return item, nil
+}
+
+func normalizeCode(value string) string {
+	value = strings.TrimSpace(strings.ToLower(value))
+	if value == "" {
+		return ""
+	}
+	var builder strings.Builder
+	lastDash := false
+	for _, r := range value {
+		switch {
+		case r >= 'a' && r <= 'z':
+			builder.WriteRune(r)
+			lastDash = false
+		case r >= '0' && r <= '9':
+			builder.WriteRune(r)
+			lastDash = false
+		case r == '_' || r == '-' || r == '.' || r == ' ':
+			if builder.Len() > 0 && !lastDash {
+				builder.WriteByte('-')
+				lastDash = true
+			}
+		}
+	}
+	return strings.Trim(builder.String(), "-")
+}
+
+func normalizeTileFormat(value string) string {
+	value = strings.TrimSpace(strings.ToLower(value))
+	switch value {
+	case "jpg", "jpeg":
+		return "jpg"
+	case "png", "webp", "pbf":
+		return value
+	case "":
+		return "png"
+	default:
+		return value
+	}
+}