On Thu, Feb 22, 2018 at 06:12:52PM +0100, Johannes Baiter wrote:
> Sorry, I accidentally submitted an incomplete version of the patch.
> Here is the corrected version.
>

Hello,

I've slightly updated the patch (also note your mail client have broken
it - you may want to update settings to avoid this), please take a look.

See also ticket 1450: https://trac.nginx.org/nginx/ticket/1450

# HG changeset patch
# User Vladimir Homutov <v...@nginx.com>
# Date 1519834295 -10800
#      Wed Feb 28 19:11:35 2018 +0300
# Node ID d420ce6b46768ea7eb23bdec84f992212293af19
# Parent  20f139e9ffa84f1a1db6039bbbb547cd35fc4534
Access log: support for disabling escaping (ticket #1450).

Based on patches by Johannes Baiter <johannes.bai...@bsb-muenchen.de>
and Calin Don.

diff --git a/src/http/modules/ngx_http_log_module.c 
b/src/http/modules/ngx_http_log_module.c
--- a/src/http/modules/ngx_http_log_module.c
+++ b/src/http/modules/ngx_http_log_module.c
@@ -90,6 +90,11 @@ typedef struct {
 } ngx_http_log_var_t;
 
 
+#define NGX_HTTP_LOG_ESCAPE_DEFAULT  0
+#define NGX_HTTP_LOG_ESCAPE_JSON     1
+#define NGX_HTTP_LOG_ESCAPE_NONE     2
+
+
 static void ngx_http_log_write(ngx_http_request_t *r, ngx_http_log_t *log,
     u_char *buf, size_t len);
 static ssize_t ngx_http_log_script_write(ngx_http_request_t *r,
@@ -126,7 +131,7 @@ static u_char *ngx_http_log_request_leng
     ngx_http_log_op_t *op);
 
 static ngx_int_t ngx_http_log_variable_compile(ngx_conf_t *cf,
-    ngx_http_log_op_t *op, ngx_str_t *value, ngx_uint_t json);
+    ngx_http_log_op_t *op, ngx_str_t *value, ngx_uint_t escape);
 static size_t ngx_http_log_variable_getlen(ngx_http_request_t *r,
     uintptr_t data);
 static u_char *ngx_http_log_variable(ngx_http_request_t *r, u_char *buf,
@@ -136,6 +141,10 @@ static size_t ngx_http_log_json_variable
     uintptr_t data);
 static u_char *ngx_http_log_json_variable(ngx_http_request_t *r, u_char *buf,
     ngx_http_log_op_t *op);
+static size_t ngx_http_log_unescaped_variable_getlen(ngx_http_request_t *r,
+    uintptr_t data);
+static u_char *ngx_http_log_unescaped_variable(ngx_http_request_t *r,
+    u_char *buf, ngx_http_log_op_t *op);
 
 
 static void *ngx_http_log_create_main_conf(ngx_conf_t *cf);
@@ -905,7 +914,7 @@ ngx_http_log_request_length(ngx_http_req
 
 static ngx_int_t
 ngx_http_log_variable_compile(ngx_conf_t *cf, ngx_http_log_op_t *op,
-    ngx_str_t *value, ngx_uint_t json)
+    ngx_str_t *value, ngx_uint_t escape)
 {
     ngx_int_t  index;
 
@@ -916,11 +925,18 @@ ngx_http_log_variable_compile(ngx_conf_t
 
     op->len = 0;
 
-    if (json) {
+    switch (escape) {
+    case NGX_HTTP_LOG_ESCAPE_JSON:
         op->getlen = ngx_http_log_json_variable_getlen;
         op->run = ngx_http_log_json_variable;
+        break;
 
-    } else {
+    case NGX_HTTP_LOG_ESCAPE_NONE:
+        op->getlen = ngx_http_log_unescaped_variable_getlen;
+        op->run = ngx_http_log_unescaped_variable;
+        break;
+
+    default: /* NGX_HTTP_LOG_ESCAPE_DEFAULT */
         op->getlen = ngx_http_log_variable_getlen;
         op->run = ngx_http_log_variable;
     }
@@ -1073,6 +1089,39 @@ ngx_http_log_json_variable(ngx_http_requ
 }
 
 
+static size_t
+ngx_http_log_unescaped_variable_getlen(ngx_http_request_t *r, uintptr_t data)
+{
+    ngx_http_variable_value_t  *value;
+
+    value = ngx_http_get_indexed_variable(r, data);
+
+    if (value == NULL || value->not_found) {
+        return 0;
+    }
+
+    value->escape = 0;
+
+    return value->len;
+}
+
+
+static u_char *
+ngx_http_log_unescaped_variable(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    ngx_http_variable_value_t  *value;
+
+    value = ngx_http_get_indexed_variable(r, op->data);
+
+    if (value == NULL || value->not_found) {
+        return buf;
+    }
+
+    return ngx_cpymem(buf, value->data, value->len);
+}
+
+
 static void *
 ngx_http_log_create_main_conf(ngx_conf_t *cf)
 {
@@ -1536,18 +1585,21 @@ ngx_http_log_compile_format(ngx_conf_t *
     size_t               i, len;
     ngx_str_t           *value, var;
     ngx_int_t           *flush;
-    ngx_uint_t           bracket, json;
+    ngx_uint_t           bracket, escape;
     ngx_http_log_op_t   *op;
     ngx_http_log_var_t  *v;
 
-    json = 0;
+    escape = NGX_HTTP_LOG_ESCAPE_DEFAULT;
     value = args->elts;
 
     if (s < args->nelts && ngx_strncmp(value[s].data, "escape=", 7) == 0) {
         data = value[s].data + 7;
 
         if (ngx_strcmp(data, "json") == 0) {
-            json = 1;
+            escape = NGX_HTTP_LOG_ESCAPE_JSON;
+
+        } else if (ngx_strcmp(data, "none") == 0) {
+            escape = NGX_HTTP_LOG_ESCAPE_NONE;
 
         } else if (ngx_strcmp(data, "default") != 0) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
@@ -1636,7 +1688,7 @@ ngx_http_log_compile_format(ngx_conf_t *
                     }
                 }
 
-                if (ngx_http_log_variable_compile(cf, op, &var, json)
+                if (ngx_http_log_variable_compile(cf, op, &var, escape)
                     != NGX_OK)
                 {
                     return NGX_CONF_ERROR;
diff --git a/src/stream/ngx_stream_log_module.c 
b/src/stream/ngx_stream_log_module.c
--- a/src/stream/ngx_stream_log_module.c
+++ b/src/stream/ngx_stream_log_module.c
@@ -89,6 +89,11 @@ typedef struct {
 } ngx_stream_log_var_t;
 
 
+#define NGX_STREAM_LOG_ESCAPE_DEFAULT  0
+#define NGX_STREAM_LOG_ESCAPE_JSON     1
+#define NGX_STREAM_LOG_ESCAPE_NONE     2
+
+
 static void ngx_stream_log_write(ngx_stream_session_t *s, ngx_stream_log_t 
*log,
     u_char *buf, size_t len);
 static ssize_t ngx_stream_log_script_write(ngx_stream_session_t *s,
@@ -106,7 +111,7 @@ static void ngx_stream_log_flush(ngx_ope
 static void ngx_stream_log_flush_handler(ngx_event_t *ev);
 
 static ngx_int_t ngx_stream_log_variable_compile(ngx_conf_t *cf,
-    ngx_stream_log_op_t *op, ngx_str_t *value, ngx_uint_t json);
+    ngx_stream_log_op_t *op, ngx_str_t *value, ngx_uint_t escape);
 static size_t ngx_stream_log_variable_getlen(ngx_stream_session_t *s,
     uintptr_t data);
 static u_char *ngx_stream_log_variable(ngx_stream_session_t *s, u_char *buf,
@@ -116,7 +121,10 @@ static size_t ngx_stream_log_json_variab
     uintptr_t data);
 static u_char *ngx_stream_log_json_variable(ngx_stream_session_t *s,
     u_char *buf, ngx_stream_log_op_t *op);
-
+static size_t ngx_stream_log_unescaped_variable_getlen(ngx_stream_session_t *s,
+    uintptr_t data);
+static u_char *ngx_stream_log_unescaped_variable(ngx_stream_session_t *s,
+    u_char *buf, ngx_stream_log_op_t *op);
 
 static void *ngx_stream_log_create_main_conf(ngx_conf_t *cf);
 static void *ngx_stream_log_create_srv_conf(ngx_conf_t *cf);
@@ -682,7 +690,7 @@ ngx_stream_log_copy_long(ngx_stream_sess
 
 static ngx_int_t
 ngx_stream_log_variable_compile(ngx_conf_t *cf, ngx_stream_log_op_t *op,
-    ngx_str_t *value, ngx_uint_t json)
+    ngx_str_t *value, ngx_uint_t escape)
 {
     ngx_int_t  index;
 
@@ -693,11 +701,18 @@ ngx_stream_log_variable_compile(ngx_conf
 
     op->len = 0;
 
-    if (json) {
+    switch (escape) {
+    case NGX_STREAM_LOG_ESCAPE_JSON:
         op->getlen = ngx_stream_log_json_variable_getlen;
         op->run = ngx_stream_log_json_variable;
+        break;
 
-    } else {
+    case NGX_STREAM_LOG_ESCAPE_NONE:
+        op->getlen = ngx_stream_log_unescaped_variable_getlen;
+        op->run = ngx_stream_log_unescaped_variable;
+        break;
+
+    default: /* NGX_STREAM_LOG_ESCAPE_DEFAULT */
         op->getlen = ngx_stream_log_variable_getlen;
         op->run = ngx_stream_log_variable;
     }
@@ -851,6 +866,39 @@ ngx_stream_log_json_variable(ngx_stream_
 }
 
 
+static size_t
+ngx_stream_log_unescaped_variable_getlen(ngx_stream_session_t *s, uintptr_t 
data)
+{
+    ngx_stream_variable_value_t  *value;
+
+    value = ngx_stream_get_indexed_variable(s, data);
+
+    if (value == NULL || value->not_found) {
+        return 0;
+    }
+
+    value->escape = 0;
+
+    return value->len;
+}
+
+
+static u_char *
+ngx_stream_log_unescaped_variable(ngx_stream_session_t *s, u_char *buf,
+                                  ngx_stream_log_op_t *op)
+{
+    ngx_stream_variable_value_t  *value;
+
+    value = ngx_stream_get_indexed_variable(s, op->data);
+
+    if (value == NULL || value->not_found) {
+        return buf;
+    }
+
+    return ngx_cpymem(buf, value->data, value->len);
+}
+
+
 static void *
 ngx_stream_log_create_main_conf(ngx_conf_t *cf)
 {
@@ -1265,17 +1313,20 @@ ngx_stream_log_compile_format(ngx_conf_t
     size_t                 i, len;
     ngx_str_t             *value, var;
     ngx_int_t             *flush;
-    ngx_uint_t             bracket, json;
+    ngx_uint_t             bracket, escape;
     ngx_stream_log_op_t   *op;
 
-    json = 0;
+    escape = NGX_STREAM_LOG_ESCAPE_DEFAULT;
     value = args->elts;
 
     if (s < args->nelts && ngx_strncmp(value[s].data, "escape=", 7) == 0) {
         data = value[s].data + 7;
 
         if (ngx_strcmp(data, "json") == 0) {
-            json = 1;
+            escape = NGX_STREAM_LOG_ESCAPE_JSON;
+
+        } else if (ngx_strcmp(data, "none") == 0) {
+            escape = NGX_STREAM_LOG_ESCAPE_NONE;
 
         } else if (ngx_strcmp(data, "default") != 0) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
@@ -1350,7 +1401,7 @@ ngx_stream_log_compile_format(ngx_conf_t
                     goto invalid;
                 }
 
-                if (ngx_stream_log_variable_compile(cf, op, &var, json)
+                if (ngx_stream_log_variable_compile(cf, op, &var, escape)
                     != NGX_OK)
                 {
                     return NGX_CONF_ERROR;
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