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annotate src/http/modules/ngx_http_not_modified_filter_module.c @ 4412:d620f497c50f

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Copyright updated.
author Maxim Konovalov <maxim@nginx.com>
date Wed, 18 Jan 2012 15:07:43 +0000
parents 80cc7c8bb845
children 84cc73e01aa8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
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3 * Copyright (C) Igor Sysoev
4412
d620f497c50f Copyright updated.
Maxim Konovalov <maxim@nginx.com>
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4 * Copyright (C) Nginx, Inc.
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da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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5 */
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6
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e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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12
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13 static ngx_int_t ngx_http_test_precondition(ngx_http_request_t *r);
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14 static ngx_int_t ngx_http_test_not_modified(ngx_http_request_t *r);
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15 static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf);
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e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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17
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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18 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
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19 NULL, /* preconfiguration */
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20 ngx_http_not_modified_filter_init, /* postconfiguration */
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4db54fdbcbe7 nginx-0.0.1-2003-11-10-20:17:31 import
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21
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22 NULL, /* create main configuration */
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23 NULL, /* init main configuration */
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24
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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25 NULL, /* create server configuration */
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26 NULL, /* merge server configuration */
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27
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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28 NULL, /* create location configuration */
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29 NULL /* merge location configuration */
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30 };
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31
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32
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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33 ngx_module_t ngx_http_not_modified_filter_module = {
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34 NGX_MODULE_V1,
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35 &ngx_http_not_modified_filter_module_ctx, /* module context */
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36 NULL, /* module directives */
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37 NGX_HTTP_MODULE, /* module type */
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38 NULL, /* init master */
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39 NULL, /* init module */
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40 NULL, /* init process */
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41 NULL, /* init thread */
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42 NULL, /* exit thread */
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43 NULL, /* exit process */
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44 NULL, /* exit master */
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45 NGX_MODULE_V1_PADDING
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46 };
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47
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48
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49 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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50
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51
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52 static ngx_int_t
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53 ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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54 {
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55 if (r->headers_out.status != NGX_HTTP_OK
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56 || r != r->main
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cb77c084acdb nginx-0.0.1-2003-10-09-11:00:45 import
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57 || r->headers_out.last_modified_time == -1)
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58 {
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59 return ngx_http_next_header_filter(r);
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60 }
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61
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62 if (r->headers_in.if_unmodified_since) {
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63 return ngx_http_test_precondition(r);
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64 }
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65
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66 if (r->headers_in.if_modified_since) {
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67 return ngx_http_test_not_modified(r);
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68 }
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69
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70 return ngx_http_next_header_filter(r);
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71 }
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72
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73
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74 static ngx_int_t
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75 ngx_http_test_precondition(ngx_http_request_t *r)
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76 {
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77 time_t iums;
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78
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79 iums = ngx_http_parse_time(r->headers_in.if_unmodified_since->value.data,
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80 r->headers_in.if_unmodified_since->value.len);
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81
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82 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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83 "http iums:%d lm:%d", iums, r->headers_out.last_modified_time);
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84
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85 if (iums >= r->headers_out.last_modified_time) {
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86 return ngx_http_next_header_filter(r);
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87 }
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88
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89 return ngx_http_filter_finalize_request(r, NULL,
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90 NGX_HTTP_PRECONDITION_FAILED);
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91 }
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92
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93
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94 static ngx_int_t
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95 ngx_http_test_not_modified(ngx_http_request_t *r)
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96 {
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97 time_t ims;
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98 ngx_http_core_loc_conf_t *clcf;
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99
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100 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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101
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102 if (clcf->if_modified_since == NGX_HTTP_IMS_OFF) {
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103 return ngx_http_next_header_filter(r);
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104 }
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105
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106 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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107 r->headers_in.if_modified_since->value.len);
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108
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109 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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110 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
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111
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112 if (ims != r->headers_out.last_modified_time) {
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113
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114 if (clcf->if_modified_since == NGX_HTTP_IMS_EXACT
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115 || ims < r->headers_out.last_modified_time)
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116 {
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117 return ngx_http_next_header_filter(r);
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118 }
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119 }
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120
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121 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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122 r->headers_out.status_line.len = 0;
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123 r->headers_out.content_type.len = 0;
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124 ngx_http_clear_content_length(r);
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125 ngx_http_clear_accept_ranges(r);
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126
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127 if (r->headers_out.content_encoding) {
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128 r->headers_out.content_encoding->hash = 0;
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129 r->headers_out.content_encoding = NULL;
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130 }
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parents: 2702
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131
155
46eb23d9471d nginx-0.0.1-2003-10-22-20:38:26 import
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parents: 153
diff changeset
132 return ngx_http_next_header_filter(r);
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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parents:
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133 }
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
134
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
Igor Sysoev <igor@sysoev.ru>
parents:
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135
2702
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Igor Sysoev <igor@sysoev.ru>
parents: 2592
diff changeset
136 static ngx_int_t
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parents: 2592
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137 ngx_http_not_modified_filter_init(ngx_conf_t *cf)
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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parents:
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138 {
155
46eb23d9471d nginx-0.0.1-2003-10-22-20:38:26 import
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parents: 153
diff changeset
139 ngx_http_next_header_filter = ngx_http_top_header_filter;
135
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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140 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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parents:
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141
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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142 return NGX_OK;
e29909bd9b8a nginx-0.0.1-2003-09-28-23:29:06 import
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parents:
diff changeset
143 }