caddyhttp: Add 'skip_log' var to omit request from logs (#4691)

* caddyhttp: Implement `skip_log` handler

* Refactor to use vars middleware

Co-authored-by: Matt Holt <mholt@users.noreply.github.com>

2 files changed, 14 insertions, 0 deletions

diff --git a/caddyconfig/httpcaddyfile/builtins.go b/caddyconfig/httpcaddyfile/builtins.go
index cd23348..103b7a1 100644
--- a/caddyconfig/httpcaddyfile/builtins.go
+++ b/caddyconfig/httpcaddyfile/builtins.go
@@ -48,6 +48,7 @@ func init() {
 	RegisterHandlerDirective("handle", parseHandle)
 	RegisterDirective("handle_errors", parseHandleErrors)
 	RegisterDirective("log", parseLog)
+	RegisterHandlerDirective("skip_log", parseSkipLog)
 }
 
 // parseBind parses the bind directive. Syntax:
@@ -858,3 +859,15 @@ func parseLogHelper(h Helper, globalLogNames map[string]struct{}) ([]ConfigValue
 	}
 	return configValues, nil
 }
+
+// parseSkipLog parses the skip_log directive. Syntax:
+//
+//	skip_log [<matcher>]
+func parseSkipLog(h Helper) (caddyhttp.MiddlewareHandler, error) {
+	for h.Next() {
+		if h.NextArg() {
+			return nil, h.ArgErr()
+		}
+	}
+	return caddyhttp.VarsMiddleware{"skip_log": true}, nil
+}
diff --git a/caddyconfig/httpcaddyfile/directives.go b/caddyconfig/httpcaddyfile/directives.go
index e2113eb..5ab092d 100644
--- a/caddyconfig/httpcaddyfile/directives.go
+++ b/caddyconfig/httpcaddyfile/directives.go
@@ -42,6 +42,7 @@ var directiveOrder = []string{
 	"map",
 	"vars",
 	"root",
+	"skip_log",
 
 	"header",
 	"copy_response_headers", // only in reverse_proxy's handle_response