restructured the project to comply community guideline, for others check release note

internal/proxy/fields/path_pattern.go

@@ -0,0 +1,37 @@
+package fields
+
+import (
+	"regexp"
+
+	E "github.com/yusing/go-proxy/internal/error"
+)
+
+type PathPattern string
+type PathPatterns = []PathPattern
+
+func NewPathPattern(s string) (PathPattern, E.NestedError) {
+	if len(s) == 0 {
+		return "", E.Invalid("path", "must not be empty")
+	}
+	if !pathPattern.MatchString(s) {
+		return "", E.Invalid("path pattern", s)
+	}
+	return PathPattern(s), nil
+}
+
+func ValidatePathPatterns(s []string) (PathPatterns, E.NestedError) {
+	if len(s) == 0 {
+		return []PathPattern{"/"}, nil
+	}
+	pp := make(PathPatterns, len(s))
+	for i, v := range s {
+		if pattern, err := NewPathPattern(v); err.HasError() {
+			return nil, err
+		} else {
+			pp[i] = pattern
+		}
+	}
+	return pp, nil
+}
+
+var pathPattern = regexp.MustCompile(`^(/[-\w./]*({\$\})?|((GET|POST|DELETE|PUT|HEAD|OPTION) /[-\w./]*({\$\})?))$`)