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-rw-r--r--modules/caddyhttp/app.go1
-rw-r--r--modules/caddyhttp/replacer.go19
2 files changed, 20 insertions, 0 deletions
diff --git a/modules/caddyhttp/app.go b/modules/caddyhttp/app.go
index 91c31c8..64cc540 100644
--- a/modules/caddyhttp/app.go
+++ b/modules/caddyhttp/app.go
@@ -50,6 +50,7 @@ func init() {
// `{http.request.body}` | The request body (⚠️ inefficient; use only for debugging)
// `{http.request.cookie.*}` | HTTP request cookie
// `{http.request.duration}` | Time up to now spent handling the request (after decoding headers from client)
+// `{http.request.uuid}` | The request unique identifier
// `{http.request.header.*}` | Specific request header field
// `{http.request.host.labels.*}` | Request host labels (0-based from right); e.g. for foo.example.com: 0=com, 1=example, 2=foo
// `{http.request.host}` | The host part of the request's Host header
diff --git a/modules/caddyhttp/replacer.go b/modules/caddyhttp/replacer.go
index 2cf456f..26f7e0b 100644
--- a/modules/caddyhttp/replacer.go
+++ b/modules/caddyhttp/replacer.go
@@ -40,6 +40,7 @@ import (
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/modules/caddytls"
+ "github.com/google/uuid"
)
// NewTestReplacer creates a replacer for an http.Request
@@ -54,6 +55,7 @@ func NewTestReplacer(req *http.Request) *caddy.Replacer {
func addHTTPVarsToReplacer(repl *caddy.Replacer, req *http.Request, w http.ResponseWriter) {
SetVar(req.Context(), "start_time", time.Now())
+ SetVar(req.Context(), "uuid", new(requestID))
httpVars := func(key string) (interface{}, bool) {
if req != nil {
@@ -146,6 +148,9 @@ func addHTTPVarsToReplacer(repl *caddy.Replacer, req *http.Request, w http.Respo
case "http.request.duration":
start := GetVar(req.Context(), "start_time").(time.Time)
return time.Since(start), true
+ case "http.request.uuid":
+ id := GetVar(req.Context(), "uuid").(*requestID)
+ return id.String(), true
case "http.request.body":
if req.Body == nil {
return "", true
@@ -400,6 +405,20 @@ func getTLSPeerCert(cs *tls.ConnectionState) *x509.Certificate {
return cs.PeerCertificates[0]
}
+type requestID struct {
+ value string
+}
+
+// Lazy generates UUID string or return cached value if present
+func (rid *requestID) String() string {
+ if rid.value == "" {
+ if id, err := uuid.NewRandom(); err == nil {
+ rid.value = id.String()
+ }
+ }
+ return rid.value
+}
+
const (
reqCookieReplPrefix = "http.request.cookie."
reqHeaderReplPrefix = "http.request.header."