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50
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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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50
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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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326
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13 typedef struct ngx_http_header_val_s ngx_http_header_val_t;
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14
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15 typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r,
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16 ngx_http_header_val_t *hv, ngx_str_t *value);
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174
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17
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18
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19 typedef struct {
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464
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20 ngx_str_t name;
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21 ngx_uint_t offset;
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22 ngx_http_set_header_pt handler;
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326
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23 } ngx_http_set_header_t;
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24
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25
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26 struct ngx_http_header_val_s {
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464
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27 ngx_http_complex_value_t value;
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28 ngx_uint_t hash;
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29 ngx_str_t key;
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30 ngx_http_set_header_pt handler;
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31 ngx_uint_t offset;
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326
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32 };
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33
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34
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376
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35 #define NGX_HTTP_EXPIRES_OFF 0
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36 #define NGX_HTTP_EXPIRES_EPOCH 1
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37 #define NGX_HTTP_EXPIRES_MAX 2
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38 #define NGX_HTTP_EXPIRES_ACCESS 3
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39 #define NGX_HTTP_EXPIRES_MODIFIED 4
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394
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40 #define NGX_HTTP_EXPIRES_DAILY 5
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376
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41
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42
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326
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43 typedef struct {
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376
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44 ngx_uint_t expires;
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45 time_t expires_time;
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326
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46 ngx_array_t *headers;
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50
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47 } ngx_http_headers_conf_t;
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48
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49
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326
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50 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r,
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51 ngx_http_headers_conf_t *conf);
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52 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r,
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53 ngx_http_header_val_t *hv, ngx_str_t *value);
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54 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r,
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55 ngx_http_header_val_t *hv, ngx_str_t *value);
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56
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50
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57 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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58 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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59 void *parent, void *child);
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230
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60 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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61 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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62 void *conf);
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122
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63 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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64 void *conf);
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65
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66
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326
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67 static ngx_http_set_header_t ngx_http_set_headers[] = {
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68
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69 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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70
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71 { ngx_string("Last-Modified"),
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72 offsetof(ngx_http_headers_out_t, last_modified),
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73 ngx_http_set_last_modified },
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74
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75 { ngx_null_string, 0, NULL }
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76 };
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77
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78
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79 static ngx_command_t ngx_http_headers_filter_commands[] = {
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80
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81 { ngx_string("expires"),
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122
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82 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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376
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83 |NGX_CONF_TAKE12,
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84 ngx_http_headers_expires,
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85 NGX_HTTP_LOC_CONF_OFFSET,
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86 0,
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87 NULL},
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88
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122
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89 { ngx_string("add_header"),
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90 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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91 |NGX_CONF_TAKE2,
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92 ngx_http_headers_add,
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93 NGX_HTTP_LOC_CONF_OFFSET,
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94 0,
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95 NULL},
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96
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97 ngx_null_command
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98 };
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99
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100
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101 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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102 NULL, /* preconfiguration */
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230
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103 ngx_http_headers_filter_init, /* postconfiguration */
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104
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105 NULL, /* create main configuration */
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106 NULL, /* init main configuration */
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107
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108 NULL, /* create server configuration */
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109 NULL, /* merge server configuration */
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110
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111 ngx_http_headers_create_conf, /* create location configuration */
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112 ngx_http_headers_merge_conf /* merge location configuration */
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113 };
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114
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115
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116 ngx_module_t ngx_http_headers_filter_module = {
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58
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117 NGX_MODULE_V1,
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118 &ngx_http_headers_filter_module_ctx, /* module context */
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119 ngx_http_headers_filter_commands, /* module directives */
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120 NGX_HTTP_MODULE, /* module type */
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90
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121 NULL, /* init master */
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230
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122 NULL, /* init module */
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90
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123 NULL, /* init process */
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124 NULL, /* init thread */
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125 NULL, /* exit thread */
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126 NULL, /* exit process */
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127 NULL, /* exit master */
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128 NGX_MODULE_V1_PADDING
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129 };
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130
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131
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132 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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133
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134
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135 static ngx_int_t
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136 ngx_http_headers_filter(ngx_http_request_t *r)
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137 {
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326
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138 ngx_str_t value;
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58
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139 ngx_uint_t i;
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174
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140 ngx_http_header_val_t *h;
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141 ngx_http_headers_conf_t *conf;
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142
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326
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143 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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144
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145 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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146 || r != r->main
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212
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147 || (r->headers_out.status != NGX_HTTP_OK
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148 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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650
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149 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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212
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150 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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151 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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664
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152 && r->headers_out.status != NGX_HTTP_SEE_OTHER
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153 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED
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154 && r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT))
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92
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155 {
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156 return ngx_http_next_header_filter(r);
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157 }
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158
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159 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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160 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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161 return NGX_ERROR;
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162 }
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163 }
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58
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164
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326
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165 if (conf->headers) {
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166 h = conf->headers->elts;
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167 for (i = 0; i < conf->headers->nelts; i++) {
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50
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168
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464
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169 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
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170 return NGX_ERROR;
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58
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171 }
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172
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326
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173 if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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174 return NGX_ERROR;
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175 }
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176 }
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177 }
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178
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326
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179 return ngx_http_next_header_filter(r);
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180 }
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181
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122
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182
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326
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183 static ngx_int_t
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184 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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185 {
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186 size_t len;
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394
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187 time_t now, expires_time, max_age;
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326
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188 ngx_uint_t i;
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189 ngx_table_elt_t *expires, *cc, **ccp;
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122
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190
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326
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191 expires = r->headers_out.expires;
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192
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193 if (expires == NULL) {
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194
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195 expires = ngx_list_push(&r->headers_out.headers);
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196 if (expires == NULL) {
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197 return NGX_ERROR;
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198 }
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122
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199
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326
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200 r->headers_out.expires = expires;
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201
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202 expires->hash = 1;
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570
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203 ngx_str_set(&expires->key, "Expires");
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326
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204 }
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205
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206 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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207 expires->value.len = len - 1;
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208
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209 ccp = r->headers_out.cache_control.elts;
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210
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211 if (ccp == NULL) {
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212
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213 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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214 1, sizeof(ngx_table_elt_t *))
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215 != NGX_OK)
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216 {
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217 return NGX_ERROR;
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122
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218 }
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219
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220 ccp = ngx_array_push(&r->headers_out.cache_control);
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221 if (ccp == NULL) {
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222 return NGX_ERROR;
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223 }
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224
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225 cc = ngx_list_push(&r->headers_out.headers);
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226 if (cc == NULL) {
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227 return NGX_ERROR;
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228 }
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229
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230 cc->hash = 1;
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570
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231 ngx_str_set(&cc->key, "Cache-Control");
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122
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232 *ccp = cc;
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326
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233
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234 } else {
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235 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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236 ccp[i]->hash = 0;
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237 }
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238
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239 cc = ccp[0];
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240 }
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241
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242 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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243 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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570
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244 ngx_str_set(&cc->value, "no-cache");
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326
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245 return NGX_OK;
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246 }
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247
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248 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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249 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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250 /* 10 years */
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570
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251 ngx_str_set(&cc->value, "max-age=315360000");
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326
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252 return NGX_OK;
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253 }
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254
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382
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255 expires->value.data = ngx_pnalloc(r->pool, len);
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326
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256 if (expires->value.data == NULL) {
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257 return NGX_ERROR;
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258 }
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259
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646
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260 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) {
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326
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261 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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262 ngx_cached_http_time.len + 1);
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570
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263 ngx_str_set(&cc->value, "max-age=0");
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326
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264 return NGX_OK;
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122
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265 }
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266
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394
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267 now = ngx_time();
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268
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646
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269 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) {
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270 expires_time = ngx_next_time(conf->expires_time);
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271 max_age = expires_time - now;
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272
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273 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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274 || r->headers_out.last_modified_time == -1)
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376
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275 {
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394
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276 expires_time = now + conf->expires_time;
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277 max_age = conf->expires_time;
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278
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376
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279 } else {
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394
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280 expires_time = r->headers_out.last_modified_time + conf->expires_time;
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281 max_age = expires_time - now;
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376
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282 }
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283
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394
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284 ngx_http_time(expires->value.data, expires_time);
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376
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285
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560
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286 if (conf->expires_time < 0 || max_age < 0) {
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570
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287 ngx_str_set(&cc->value, "no-cache");
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326
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288 return NGX_OK;
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289 }
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122
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290
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382
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291 cc->value.data = ngx_pnalloc(r->pool,
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292 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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326
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293 if (cc->value.data == NULL) {
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294 return NGX_ERROR;
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295 }
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296
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394
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297 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
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326
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298 - cc->value.data;
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299
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300 return NGX_OK;
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301 }
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302
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303
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304 static ngx_int_t
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305 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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306 ngx_str_t *value)
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307 {
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308 ngx_table_elt_t *h;
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174
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309
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430
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310 if (value->len) {
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311 h = ngx_list_push(&r->headers_out.headers);
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312 if (h == NULL) {
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313 return NGX_ERROR;
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314 }
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315
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464
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316 h->hash = hv->hash;
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317 h->key = hv->key;
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430
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318 h->value = *value;
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326
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319 }
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320
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321 return NGX_OK;
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322 }
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323
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174
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324
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326
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325 static ngx_int_t
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326 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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327 ngx_str_t *value)
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328 {
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329 ngx_table_elt_t *cc, **ccp;
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330
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331 ccp = r->headers_out.cache_control.elts;
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332
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333 if (ccp == NULL) {
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334
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335 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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336 1, sizeof(ngx_table_elt_t *))
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337 != NGX_OK)
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338 {
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339 return NGX_ERROR;
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122
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340 }
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341 }
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342
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326
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343 ccp = ngx_array_push(&r->headers_out.cache_control);
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344 if (ccp == NULL) {
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345 return NGX_ERROR;
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346 }
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347
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348 cc = ngx_list_push(&r->headers_out.headers);
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349 if (cc == NULL) {
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350 return NGX_ERROR;
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351 }
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352
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353 cc->hash = 1;
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570
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354 ngx_str_set(&cc->key, "Cache-Control");
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326
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355 cc->value = *value;
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356
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357 *ccp = cc;
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358
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359 return NGX_OK;
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360 }
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361
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362
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363 static ngx_int_t
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364 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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365 ngx_str_t *value)
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366 {
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367 ngx_table_elt_t *h, **old;
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368
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369 if (hv->offset) {
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370 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
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371
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372 } else {
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373 old = NULL;
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374 }
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375
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348
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376 r->headers_out.last_modified_time = -1;
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377
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326
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378 if (old == NULL || *old == NULL) {
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348
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379
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380 if (value->len == 0) {
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381 return NGX_OK;
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382 }
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383
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326
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384 h = ngx_list_push(&r->headers_out.headers);
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385 if (h == NULL) {
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386 return NGX_ERROR;
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|
|
387 }
|
|
|
388
|
|
|
389 } else {
|
|
|
390 h = *old;
|
|
348
|
391
|
|
|
392 if (value->len == 0) {
|
|
|
393 h->hash = 0;
|
|
|
394 return NGX_OK;
|
|
|
395 }
|
|
326
|
396 }
|
|
|
397
|
|
464
|
398 h->hash = hv->hash;
|
|
|
399 h->key = hv->key;
|
|
326
|
400 h->value = *value;
|
|
|
401
|
|
|
402 return NGX_OK;
|
|
50
|
403 }
|
|
|
404
|
|
|
405
|
|
|
406 static void *
|
|
|
407 ngx_http_headers_create_conf(ngx_conf_t *cf)
|
|
126
|
408 {
|
|
50
|
409 ngx_http_headers_conf_t *conf;
|
|
|
410
|
|
122
|
411 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
|
|
50
|
412 if (conf == NULL) {
|
|
496
|
413 return NULL;
|
|
50
|
414 }
|
|
|
415
|
|
122
|
416 /*
|
|
|
417 * set by ngx_pcalloc():
|
|
|
418 *
|
|
|
419 * conf->headers = NULL;
|
|
376
|
420 * conf->expires_time = 0;
|
|
122
|
421 */
|
|
|
422
|
|
376
|
423 conf->expires = NGX_CONF_UNSET_UINT;
|
|
50
|
424
|
|
|
425 return conf;
|
|
|
426 }
|
|
|
427
|
|
|
428
|
|
|
429 static char *
|
|
|
430 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
431 {
|
|
|
432 ngx_http_headers_conf_t *prev = parent;
|
|
|
433 ngx_http_headers_conf_t *conf = child;
|
|
|
434
|
|
376
|
435 if (conf->expires == NGX_CONF_UNSET_UINT) {
|
|
|
436 conf->expires = prev->expires;
|
|
|
437 conf->expires_time = prev->expires_time;
|
|
|
438
|
|
|
439 if (conf->expires == NGX_CONF_UNSET_UINT) {
|
|
|
440 conf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
441 }
|
|
122
|
442 }
|
|
|
443
|
|
|
444 if (conf->headers == NULL) {
|
|
|
445 conf->headers = prev->headers;
|
|
|
446 }
|
|
|
447
|
|
50
|
448 return NGX_CONF_OK;
|
|
|
449 }
|
|
|
450
|
|
|
451
|
|
230
|
452 static ngx_int_t
|
|
|
453 ngx_http_headers_filter_init(ngx_conf_t *cf)
|
|
|
454 {
|
|
|
455 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
456 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
|
457
|
|
|
458 return NGX_OK;
|
|
|
459 }
|
|
|
460
|
|
|
461
|
|
50
|
462 static char *
|
|
|
463 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
464 {
|
|
|
465 ngx_http_headers_conf_t *hcf = conf;
|
|
|
466
|
|
376
|
467 ngx_uint_t minus, n;
|
|
50
|
468 ngx_str_t *value;
|
|
|
469
|
|
376
|
470 if (hcf->expires != NGX_CONF_UNSET_UINT) {
|
|
50
|
471 return "is duplicate";
|
|
|
472 }
|
|
|
473
|
|
|
474 value = cf->args->elts;
|
|
|
475
|
|
376
|
476 if (cf->args->nelts == 2) {
|
|
|
477
|
|
|
478 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
|
479 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
|
480 return NGX_CONF_OK;
|
|
|
481 }
|
|
|
482
|
|
|
483 if (ngx_strcmp(value[1].data, "max") == 0) {
|
|
|
484 hcf->expires = NGX_HTTP_EXPIRES_MAX;
|
|
|
485 return NGX_CONF_OK;
|
|
|
486 }
|
|
50
|
487
|
|
376
|
488 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
|
489 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
490 return NGX_CONF_OK;
|
|
|
491 }
|
|
|
492
|
|
|
493 hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
|
|
|
494
|
|
|
495 n = 1;
|
|
|
496
|
|
|
497 } else { /* cf->args->nelts == 3 */
|
|
|
498
|
|
|
499 if (ngx_strcmp(value[1].data, "modified") != 0) {
|
|
|
500 return "invalid value";
|
|
|
501 }
|
|
|
502
|
|
|
503 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
|
|
|
504
|
|
|
505 n = 2;
|
|
238
|
506 }
|
|
|
507
|
|
394
|
508 if (value[n].data[0] == '@') {
|
|
|
509 value[n].data++;
|
|
|
510 value[n].len--;
|
|
|
511 minus = 0;
|
|
|
512
|
|
|
513 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) {
|
|
640
|
514 return "daily time cannot be used with \"modified\" parameter";
|
|
394
|
515 }
|
|
|
516
|
|
|
517 hcf->expires = NGX_HTTP_EXPIRES_DAILY;
|
|
|
518
|
|
|
519 } else if (value[n].data[0] == '+') {
|
|
376
|
520 value[n].data++;
|
|
|
521 value[n].len--;
|
|
50
|
522 minus = 0;
|
|
|
523
|
|
376
|
524 } else if (value[n].data[0] == '-') {
|
|
|
525 value[n].data++;
|
|
|
526 value[n].len--;
|
|
50
|
527 minus = 1;
|
|
|
528
|
|
|
529 } else {
|
|
|
530 minus = 0;
|
|
|
531 }
|
|
|
532
|
|
376
|
533 hcf->expires_time = ngx_parse_time(&value[n], 1);
|
|
50
|
534
|
|
662
|
535 if (hcf->expires_time == (time_t) NGX_ERROR) {
|
|
50
|
536 return "invalid value";
|
|
|
537 }
|
|
126
|
538
|
|
394
|
539 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY
|
|
|
540 && hcf->expires_time > 24 * 60 * 60)
|
|
|
541 {
|
|
|
542 return "daily time value must be less than 24 hours";
|
|
|
543 }
|
|
|
544
|
|
50
|
545 if (minus) {
|
|
376
|
546 hcf->expires_time = - hcf->expires_time;
|
|
50
|
547 }
|
|
|
548
|
|
|
549 return NGX_CONF_OK;
|
|
|
550 }
|
|
122
|
551
|
|
|
552
|
|
|
553 static char *
|
|
|
554 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
555 {
|
|
|
556 ngx_http_headers_conf_t *hcf = conf;
|
|
|
557
|
|
464
|
558 ngx_str_t *value;
|
|
|
559 ngx_uint_t i;
|
|
|
560 ngx_http_header_val_t *hv;
|
|
|
561 ngx_http_set_header_t *set;
|
|
|
562 ngx_http_compile_complex_value_t ccv;
|
|
122
|
563
|
|
|
564 value = cf->args->elts;
|
|
|
565
|
|
|
566 if (hcf->headers == NULL) {
|
|
174
|
567 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
568 sizeof(ngx_http_header_val_t));
|
|
122
|
569 if (hcf->headers == NULL) {
|
|
|
570 return NGX_CONF_ERROR;
|
|
|
571 }
|
|
|
572 }
|
|
|
573
|
|
464
|
574 hv = ngx_array_push(hcf->headers);
|
|
|
575 if (hv == NULL) {
|
|
122
|
576 return NGX_CONF_ERROR;
|
|
|
577 }
|
|
|
578
|
|
464
|
579 hv->hash = 1;
|
|
|
580 hv->key = value[1];
|
|
|
581 hv->handler = ngx_http_add_header;
|
|
|
582 hv->offset = 0;
|
|
174
|
583
|
|
464
|
584 set = ngx_http_set_headers;
|
|
|
585 for (i = 0; set[i].name.len; i++) {
|
|
|
586 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) {
|
|
326
|
587 continue;
|
|
|
588 }
|
|
|
589
|
|
464
|
590 hv->offset = set[i].offset;
|
|
|
591 hv->handler = set[i].handler;
|
|
|
592
|
|
326
|
593 break;
|
|
|
594 }
|
|
|
595
|
|
466
|
596 if (value[2].len == 0) {
|
|
|
597 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t));
|
|
|
598 return NGX_CONF_OK;
|
|
|
599 }
|
|
|
600
|
|
464
|
601 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
|
174
|
602
|
|
464
|
603 ccv.cf = cf;
|
|
|
604 ccv.value = &value[2];
|
|
|
605 ccv.complex_value = &hv->value;
|
|
174
|
606
|
|
464
|
607 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
|
174
|
608 return NGX_CONF_ERROR;
|
|
|
609 }
|
|
122
|
610
|
|
|
611 return NGX_CONF_OK;
|
|
|
612 }
|
