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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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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>
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11
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12
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680
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13 static ngx_uint_t ngx_http_test_if_unmodified(ngx_http_request_t *r);
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14 static ngx_uint_t ngx_http_test_if_modified(ngx_http_request_t *r);
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15 static ngx_uint_t ngx_http_test_if_match(ngx_http_request_t *r,
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16 ngx_table_elt_t *header);
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230
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17 static ngx_int_t ngx_http_not_modified_filter_init(ngx_conf_t *cf);
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0
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18
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19
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20 static ngx_http_module_t ngx_http_not_modified_filter_module_ctx = {
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58
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21 NULL, /* preconfiguration */
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230
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22 ngx_http_not_modified_filter_init, /* postconfiguration */
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0
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23
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24 NULL, /* create main configuration */
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25 NULL, /* init main configuration */
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26
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27 NULL, /* create server configuration */
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28 NULL, /* merge server configuration */
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29
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30 NULL, /* create location configuration */
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31 NULL /* merge location configuration */
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32 };
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33
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34
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35 ngx_module_t ngx_http_not_modified_filter_module = {
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58
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36 NGX_MODULE_V1,
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0
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37 &ngx_http_not_modified_filter_module_ctx, /* module context */
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38 NULL, /* module directives */
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39 NGX_HTTP_MODULE, /* module type */
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90
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40 NULL, /* init master */
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230
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41 NULL, /* init module */
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90
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42 NULL, /* init process */
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43 NULL, /* init thread */
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44 NULL, /* exit thread */
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45 NULL, /* exit process */
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46 NULL, /* exit master */
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47 NGX_MODULE_V1_PADDING
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0
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48 };
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49
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50
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51 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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52
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53
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480
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54 static ngx_int_t
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55 ngx_http_not_modified_header_filter(ngx_http_request_t *r)
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0
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56 {
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57 if (r->headers_out.status != NGX_HTTP_OK
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146
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58 || r != r->main
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0
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59 || r->headers_out.last_modified_time == -1)
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60 {
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61 return ngx_http_next_header_filter(r);
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62 }
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612
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63
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680
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64 if (r->headers_in.if_unmodified_since
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65 && !ngx_http_test_if_unmodified(r))
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66 {
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67 return ngx_http_filter_finalize_request(r, NULL,
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68 NGX_HTTP_PRECONDITION_FAILED);
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69 }
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70
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71 if (r->headers_in.if_match
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72 && !ngx_http_test_if_match(r, r->headers_in.if_match))
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73 {
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74 return ngx_http_filter_finalize_request(r, NULL,
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75 NGX_HTTP_PRECONDITION_FAILED);
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608
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76 }
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612
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77
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680
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78 if (r->headers_in.if_modified_since || r->headers_in.if_none_match) {
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79
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80 if (r->headers_in.if_modified_since
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81 && ngx_http_test_if_modified(r))
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82 {
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83 return ngx_http_next_header_filter(r);
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84 }
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85
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86 if (r->headers_in.if_none_match
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87 && !ngx_http_test_if_match(r, r->headers_in.if_none_match))
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88 {
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89 return ngx_http_next_header_filter(r);
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90 }
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91
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92 /* not modified */
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93
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94 r->headers_out.status = NGX_HTTP_NOT_MODIFIED;
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95 r->headers_out.status_line.len = 0;
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96 r->headers_out.content_type.len = 0;
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97 ngx_http_clear_content_length(r);
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98 ngx_http_clear_accept_ranges(r);
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99
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100 if (r->headers_out.content_encoding) {
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101 r->headers_out.content_encoding->hash = 0;
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102 r->headers_out.content_encoding = NULL;
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103 }
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104
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105 return ngx_http_next_header_filter(r);
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608
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106 }
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107
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108 return ngx_http_next_header_filter(r);
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109 }
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110
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111
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680
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112 static ngx_uint_t
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113 ngx_http_test_if_unmodified(ngx_http_request_t *r)
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608
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114 {
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115 time_t iums;
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116
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117 iums = ngx_http_parse_time(r->headers_in.if_unmodified_since->value.data,
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118 r->headers_in.if_unmodified_since->value.len);
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119
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120 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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121 "http iums:%d lm:%d", iums, r->headers_out.last_modified_time);
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122
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123 if (iums >= r->headers_out.last_modified_time) {
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680
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124 return 1;
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608
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125 }
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126
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680
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127 return 0;
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608
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128 }
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129
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130
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680
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131 static ngx_uint_t
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132 ngx_http_test_if_modified(ngx_http_request_t *r)
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608
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133 {
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134 time_t ims;
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135 ngx_http_core_loc_conf_t *clcf;
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0
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136
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444
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137 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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138
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139 if (clcf->if_modified_since == NGX_HTTP_IMS_OFF) {
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680
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140 return 1;
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444
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141 }
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142
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0
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143 ims = ngx_http_parse_time(r->headers_in.if_modified_since->value.data,
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144 r->headers_in.if_modified_since->value.len);
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126
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145
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0
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146 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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147 "http ims:%d lm:%d", ims, r->headers_out.last_modified_time);
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148
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680
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149 if (ims == r->headers_out.last_modified_time) {
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150 return 0;
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151 }
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152
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153 if (clcf->if_modified_since == NGX_HTTP_IMS_EXACT
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154 || ims < r->headers_out.last_modified_time)
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155 {
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156 return 1;
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157 }
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158
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159 return 0;
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160 }
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161
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162
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163 static ngx_uint_t
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164 ngx_http_test_if_match(ngx_http_request_t *r, ngx_table_elt_t *header)
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165 {
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166 u_char *start, *end, ch;
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167 ngx_str_t *etag, *list;
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168
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169 list = &header->value;
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170
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171 if (list->len == 1 && list->data[0] == '*') {
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172 return 1;
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173 }
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174
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175 if (r->headers_out.etag == NULL) {
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176 return 0;
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177 }
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178
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179 etag = &r->headers_out.etag->value;
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180
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181 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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182 "http im:\"%V\" etag:%V", list, etag);
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183
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184 start = list->data;
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185 end = list->data + list->len;
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424
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186
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680
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187 while (start < end) {
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188
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189 if (etag->len > (size_t) (end - start)) {
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190 return 0;
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191 }
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192
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193 if (ngx_strncmp(start, etag->data, etag->len) != 0) {
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194 goto skip;
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195 }
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196
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197 start += etag->len;
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198
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199 while (start < end) {
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200 ch = *start;
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201
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202 if (ch == ' ' || ch == '\t') {
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203 start++;
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204 continue;
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205 }
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206
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207 break;
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208 }
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209
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210 if (start == end || *start == ',') {
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211 return 1;
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212 }
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213
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214 skip:
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215
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216 while (start < end && *start != ',') { start++; }
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217 while (start < end) {
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218 ch = *start;
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219
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220 if (ch == ' ' || ch == '\t' || ch == ',') {
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221 start++;
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222 continue;
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223 }
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224
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225 break;
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424
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226 }
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0
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227 }
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228
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680
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229 return 0;
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0
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230 }
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231
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232
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480
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233 static ngx_int_t
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234 ngx_http_not_modified_filter_init(ngx_conf_t *cf)
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0
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235 {
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236 ngx_http_next_header_filter = ngx_http_top_header_filter;
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237 ngx_http_top_header_filter = ngx_http_not_modified_header_filter;
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238
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239 return NGX_OK;
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240 }
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