httpcaddyfile: Add certificate_pem placeholder short, add to godoc (#…

…3846)

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

caddyconfig/httpcaddyfile/httptype.go

@@ -99,6 +99,7 @@ func (st ServerType) Setup(inputServerBlocks []caddyfile.ServerBlock,
 		"{tls_client_issuer}", "{http.request.tls.client.issuer}",
 		"{tls_client_serial}", "{http.request.tls.client.serial}",
 		"{tls_client_subject}", "{http.request.tls.client.subject}",
+		"{tls_client_certificate_pem}", "{http.request.tls.client.certificate_pem}",
 	)
 
 	// these are placeholders that allow a user-defined final

modules/caddyhttp/app.go

@@ -75,6 +75,7 @@ func init() {
 // `{http.request.tls.client.fingerprint}` | The SHA256 checksum of the client certificate
 // `{http.request.tls.client.public_key}` | The public key of the client certificate.
 // `{http.request.tls.client.public_key_sha256}` | The SHA256 checksum of the client's public key.
+// `{http.request.tls.client.certificate_pem}` | The PEM-encoded value of the certificate.
 // `{http.request.tls.client.issuer}` | The issuer DN of the client certificate
 // `{http.request.tls.client.serial}` | The serial number of the client certificate
 // `{http.request.tls.client.subject}` | The subject DN of the client certificate