Adding upstream version 2.52.6.

Signed-off-by: Daniel Baumann <daniel@debian.org>

middleware/rewrite/rewrite.go

@@ -0,0 +1,54 @@
+package rewrite
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+// New creates a new middleware handler
+func New(config ...Config) fiber.Handler {
+	cfg := configDefault(config...)
+
+	// Initialize
+	cfg.rulesRegex = map[*regexp.Regexp]string{}
+	for k, v := range cfg.Rules {
+		k = strings.ReplaceAll(k, "*", "(.*)")
+		k += "$"
+		cfg.rulesRegex[regexp.MustCompile(k)] = v
+	}
+	// Middleware function
+	return func(c *fiber.Ctx) error {
+		// Next request to skip middleware
+		if cfg.Next != nil && cfg.Next(c) {
+			return c.Next()
+		}
+		// Rewrite
+		for k, v := range cfg.rulesRegex {
+			replacer := captureTokens(k, c.Path())
+			if replacer != nil {
+				c.Path(replacer.Replace(v))
+				break
+			}
+		}
+		return c.Next()
+	}
+}
+
+// https://github.com/labstack/echo/blob/master/middleware/rewrite.go
+func captureTokens(pattern *regexp.Regexp, input string) *strings.Replacer {
+	groups := pattern.FindAllStringSubmatch(input, -1)
+	if groups == nil {
+		return nil
+	}
+	values := groups[0][1:]
+	replace := make([]string, 2*len(values))
+	for i, v := range values {
+		j := 2 * i
+		replace[j] = "$" + strconv.Itoa(i+1)
+		replace[j+1] = v
+	}
+	return strings.NewReplacer(replace...)
+}