Write static HTML when out of office hours

[rbdr/ngx_http_office_hours_filter_module] / ngx_http_office_hours_filter_module.c
diff --git a/ngx_http_office_hours_filter_module.c b/ngx_http_office_hours_filter_module.c

index ee914b1a76ed245e331ae5493d323f02354b3e1e..b9df683205ead8b2e83e5dd925705b62688edaff 100644 (file)
--- a/ngx_http_office_hours_filter_module.c
+++ b/ngx_http_office_hours_filter_module.c
@@ -25,6 +25,7 @@
  const ngx_uint_t WEEK_LENGTH = 7;
  const char * CLOSED_TOKEN = "closed";
  const ngx_str_t TIME_REGEX = ngx_string("([0-9]{1,2})(?:\\:([0-9]{2}))?\\-([0-9]{1,2})(?:\\:([0-9]{2}))?");
+const ngx_str_t OUTPUT_HTML = ngx_string("<!doctype html><html><head><title>This website is currently closed!</title></head><body><h1>This website is currently closed!</h1><p>This website has closed for the day, please check our office hours below</p></body></html>");
  
  /* Main Configuration Structure */
  
@@ -44,8 +45,9 @@ static ngx_int_t ngx_http_office_hours_init(ngx_conf_t * cf);
  static char *ngx_http_office_hours(ngx_conf_t * cf, ngx_command_t * cmd,
                                     void *conf);
  
-/* Body Filter Storage */
+/* Filter Storage */
  
+static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
  static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
  
  /* Utility Functions */
@@ -114,17 +116,60 @@ ngx_module_t ngx_http_office_hours_filter_module = {
  };
  
  
+/*
+ * Main Header Filter
+ * If the current time is within office hours, it goes to the next
+ * handler. Otherwise it sets the headers to 403
+ */
+
+static ngx_int_t
+ngx_http_office_hours_header_filter(ngx_http_request_t * r)
+{
+
+    ngx_uint_t ** parsed_office_hours;
+    ngx_http_office_hours_conf_t *conf;
+
+    conf =
+        ngx_http_get_module_loc_conf(r,
+                                     ngx_http_office_hours_filter_module);
+
+
+    if (conf->office_hours == NULL) {
+        ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0,
+                      "Office hours disabled");
+        return ngx_http_next_header_filter(r);
+    }
+
+    parsed_office_hours = parse_office_hours(conf->office_hours);
+
+    if (within_office_hours(parsed_office_hours)) {
+        ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0,
+                      "Within office hours");
+        return ngx_http_next_header_filter(r);
+    }
+
+    ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0,
+                  "Outside office hours");
+
+    r->headers_out.status = NGX_HTTP_FORBIDDEN;
+    r->headers_out.content_length_n = OUTPUT_HTML.len;
+
+    return ngx_http_next_header_filter(r);
+}
+
  /*
   * Main Body Filter
   * If the current time is within office hours, it goes to the next
- * handler. Otherwise it returns 403 and the office hour listing.
+ * handler. Otherwise it replaces the body with the office hours.
   */
  
  static ngx_int_t
-ngx_http_office_hours_body_filter(ngx_http_request_t * r, ngx_chain_t * in)
+ngx_http_office_hours_body_filter(ngx_http_request_t * r, ngx_chain_t *in)
  {
  
+    ngx_buf_t    *b;
      ngx_uint_t ** parsed_office_hours;
+    ngx_chain_t   out;
      ngx_http_office_hours_conf_t *conf;
  
      conf =
@@ -149,8 +194,24 @@ ngx_http_office_hours_body_filter(ngx_http_request_t * r, ngx_chain_t * in)
      ngx_log_error(NGX_LOG_DEBUG, r->connection->log, 0,
                    "Outside office hours");
  
-    r->keepalive = 0;
-    return NGX_HTTP_FORBIDDEN;
+    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
+    if (b == NULL) {
+        ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "Failed to allocate response buffer.");
+        return NGX_HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    out.buf = b;
+    out.next = NULL;
+
+    b->start = OUTPUT_HTML.data;
+    b->pos = b->start;
+    b->end = OUTPUT_HTML.data + OUTPUT_HTML.len;
+    b->last = b->end;
+
+    b->memory = 1;
+    b->last_buf = 1;
+
+    return ngx_http_next_body_filter(r, &out);
  }
  
  /*
@@ -374,6 +435,9 @@ static ngx_uint_t parse_number(ngx_str_t string, ngx_uint_t start, ngx_uint_t en
  static ngx_int_t ngx_http_office_hours_init(ngx_conf_t * cf)
  {
  
+    ngx_http_next_header_filter = ngx_http_top_header_filter;
+    ngx_http_top_header_filter = ngx_http_office_hours_header_filter;
+
      ngx_http_next_body_filter = ngx_http_top_body_filter;
      ngx_http_top_body_filter = ngx_http_office_hours_body_filter;