cloudapi: propagate operation/external id

Signed-off-by: Lukas Zapletal <lzap+git@redhat.com>

internal/common/external_id.go

@@ -0,0 +1,30 @@
+package common
+
+import (
+	"context"
+	"strings"
+
+	"github.com/labstack/echo/v4"
+)
+
+const ExternalIDKey string = "externalID"
+const externalIDKeyCtx ctxKey = ctxKey(ExternalIDKey)
+
+// Extracts HTTP header X-External-Id and sets it as a request context value
+func ExternalIDMiddleware(next echo.HandlerFunc) echo.HandlerFunc {
+	return func(c echo.Context) error {
+		eid := c.Request().Header.Get("X-External-Id")
+		if eid == "" {
+			return next(c)
+		}
+
+		eid = strings.TrimSuffix(eid, "\n")
+		c.Set(ExternalIDKey, eid)
+
+		ctx := c.Request().Context()
+		ctx = context.WithValue(ctx, externalIDKeyCtx, eid)
+		c.SetRequest(c.Request().WithContext(ctx))
+
+		return next(c)
+	}
+}