[PATCH 3 of 3] SSI: Implement #flastmod SSI command

[Matwey V. Kornilov]

# HG changeset patch
# User Matwey V. Kornilov <matwey.kornilov at gmail.com>
# Date 1489136594 -10800
#      Fri Mar 10 12:03:14 2017 +0300
# Branch fsize
# Node ID 7f0c8192573f8db513be169ba355c117cc80e146
# Parent  35527b6bd4d84e41e030972b770e75ef583cf0f5
SSI: Implement #flastmod SSI command

diff -r 35527b6bd4d8 -r 7f0c8192573f src/http/modules/ngx_http_ssi_filter_module.c
--- a/src/http/modules/ngx_http_ssi_filter_module.c	Wed Feb 08 20:58:49 2017 +0300
+++ b/src/http/modules/ngx_http_ssi_filter_module.c	Fri Mar 10 12:03:14 2017 +0300
@@ -93,6 +93,8 @@
     ngx_http_ssi_ctx_t *ctx, ngx_str_t **params);
 static ngx_int_t ngx_http_ssi_fsize_output(ngx_http_request_t *r, void *data,
     ngx_int_t rc);
+static ngx_int_t ngx_http_ssi_flastmod_output(ngx_http_request_t *r,
+    void *data, ngx_int_t rc);
 static ngx_int_t ngx_http_ssi_echo(ngx_http_request_t *r,
     ngx_http_ssi_ctx_t *ctx, ngx_str_t **params);
 static ngx_int_t ngx_http_ssi_config(ngx_http_request_t *r,
@@ -311,6 +313,8 @@
                        ngx_http_ssi_include_params, 0, 0, 1 },
     { ngx_string("fsize"), ngx_http_ssi_fsize,
                        ngx_http_ssi_fsize_params, 0, 0, 1 },
+    { ngx_string("flastmod"), ngx_http_ssi_fsize,
+                       ngx_http_ssi_fsize_params, 0, 0, 1 },
     { ngx_string("echo"), ngx_http_ssi_echo,
                        ngx_http_ssi_echo_params, 0, 0, 0 },
     { ngx_string("config"), ngx_http_ssi_config,
@@ -2275,14 +2279,14 @@
 
     if (uri && file) {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
-                      "fsize may be either virtual=\"%V\" or file=\"%V\"",
-                      uri, file);
+                      "%V may be either virtual=\"%V\" or file=\"%V\"",
+                      ctx->command, uri, file);
         return NGX_HTTP_SSI_ERROR;
     }
 
     if (uri == NULL && file == NULL) {
         ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
-                      "no parameter in \"fsize\" SSI command");
+                      "no parameter in \"%V\" SSI command", ctx->command);
         return NGX_HTTP_SSI_ERROR;
     }
 
@@ -2311,7 +2315,11 @@
         return NGX_ERROR;
     }
 
-    psr->handler = ngx_http_ssi_fsize_output;
+    if (ctx->command.len == sizeof("fsize") - 1) {
+        psr->handler = ngx_http_ssi_fsize_output;
+    } else if (ctx->command.len == sizeof("flastmod") - 1) {
+        psr->handler = ngx_http_ssi_flastmod_output;
+    }
     psr->data = ctx;
 
     if (ngx_http_subrequest(r, uri, &args, &sr, psr, flags) != NGX_OK) {
@@ -2380,6 +2388,56 @@
 
 
 static ngx_int_t
+ngx_http_ssi_flastmod_output(ngx_http_request_t *r, void *data, ngx_int_t rc)
+{
+    ngx_chain_t        *out;
+    ngx_buf_t          *b;
+    u_char             *p;
+    ngx_http_ssi_ctx_t *ctx;
+    ngx_str_t          *timefmt;
+    ngx_str_t           timestr;
+
+    ctx = data;
+    timefmt = &ctx->timefmt;
+
+    if (r->request_output) {
+        return rc;
+    }
+
+    if ((r->headers_out.last_modified_time == -1)
+        || (ngx_http_ssi_format_time(r, &timestr,
+                                     r->headers_out.last_modified_time,
+                                     timefmt, 0) != NGX_OK))
+    {
+        b = ngx_create_temp_buf(r->pool, 1);
+        if (b == NULL) {
+            return NGX_ERROR;
+        }
+        p = b->start;
+        b->last = ngx_sprintf(p, "-");
+    } else {
+        b = ngx_calloc_buf(r->pool);
+        if (b == NULL) {
+            return NGX_ERROR;
+        }
+        b->memory = 1;
+        b->pos = timestr.data;
+        b->last = b->pos + timestr.len;
+    }
+
+    out = ngx_alloc_chain_link(r->pool);
+    if (out == NULL) {
+        return NGX_ERROR;
+    }
+
+    out->buf = b;
+    out->next = NULL;
+
+    return ngx_http_output_filter(r, out);
+}
+
+
+static ngx_int_t
 ngx_http_ssi_echo(ngx_http_request_t *r, ngx_http_ssi_ctx_t *ctx,
     ngx_str_t **params)
 {