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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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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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326
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12 typedef struct ngx_http_header_val_s ngx_http_header_val_t;
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13
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14 typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r,
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15 ngx_http_header_val_t *hv, ngx_str_t *value);
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174
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16
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17
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18 typedef struct {
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326
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19 ngx_str_t name;
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20 ngx_uint_t offset;
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21 ngx_http_set_header_pt handler;
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22 } ngx_http_set_header_t;
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23
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24
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25 struct ngx_http_header_val_s {
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26 ngx_table_elt_t value;
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27 ngx_uint_t offset;
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28 ngx_http_set_header_pt handler;
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29 ngx_array_t *lengths;
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30 ngx_array_t *values;
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31 };
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32
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33
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376
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34 #define NGX_HTTP_EXPIRES_OFF 0
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35 #define NGX_HTTP_EXPIRES_EPOCH 1
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36 #define NGX_HTTP_EXPIRES_MAX 2
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37 #define NGX_HTTP_EXPIRES_ACCESS 3
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38 #define NGX_HTTP_EXPIRES_MODIFIED 4
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394
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39 #define NGX_HTTP_EXPIRES_DAILY 5
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376
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40
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41
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326
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42 typedef struct {
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376
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43 ngx_uint_t expires;
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44 time_t expires_time;
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326
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45 ngx_array_t *headers;
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50
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46 } ngx_http_headers_conf_t;
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47
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48
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326
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49 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r,
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50 ngx_http_headers_conf_t *conf);
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51 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r,
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52 ngx_http_header_val_t *hv, ngx_str_t *value);
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53 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r,
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54 ngx_http_header_val_t *hv, ngx_str_t *value);
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55
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50
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56 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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57 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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58 void *parent, void *child);
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230
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59 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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50
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60 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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61 void *conf);
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122
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62 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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63 void *conf);
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50
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64
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65
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326
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66 static ngx_http_set_header_t ngx_http_set_headers[] = {
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67
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68 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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69
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70 { ngx_string("Last-Modified"),
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71 offsetof(ngx_http_headers_out_t, last_modified),
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72 ngx_http_set_last_modified },
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73
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74 { ngx_null_string, 0, NULL }
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75 };
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76
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77
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50
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78 static ngx_command_t ngx_http_headers_filter_commands[] = {
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79
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80 { ngx_string("expires"),
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122
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81 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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82 |NGX_CONF_TAKE12,
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83 ngx_http_headers_expires,
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84 NGX_HTTP_LOC_CONF_OFFSET,
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85 0,
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86 NULL},
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87
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122
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88 { ngx_string("add_header"),
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89 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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90 |NGX_CONF_TAKE2,
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91 ngx_http_headers_add,
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92 NGX_HTTP_LOC_CONF_OFFSET,
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93 0,
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94 NULL},
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95
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50
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96 ngx_null_command
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97 };
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98
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99
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100 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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101 NULL, /* preconfiguration */
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230
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102 ngx_http_headers_filter_init, /* postconfiguration */
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103
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104 NULL, /* create main configuration */
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105 NULL, /* init main configuration */
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106
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107 NULL, /* create server configuration */
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108 NULL, /* merge server configuration */
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109
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110 ngx_http_headers_create_conf, /* create location configuration */
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111 ngx_http_headers_merge_conf /* merge location configuration */
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112 };
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113
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114
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115 ngx_module_t ngx_http_headers_filter_module = {
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58
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116 NGX_MODULE_V1,
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117 &ngx_http_headers_filter_module_ctx, /* module context */
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118 ngx_http_headers_filter_commands, /* module directives */
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119 NGX_HTTP_MODULE, /* module type */
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90
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120 NULL, /* init master */
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230
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121 NULL, /* init module */
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90
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122 NULL, /* init process */
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123 NULL, /* init thread */
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124 NULL, /* exit thread */
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125 NULL, /* exit process */
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126 NULL, /* exit master */
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127 NGX_MODULE_V1_PADDING
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50
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128 };
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129
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130
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131 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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132
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133
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134 static ngx_int_t
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135 ngx_http_headers_filter(ngx_http_request_t *r)
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136 {
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326
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137 ngx_str_t value;
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58
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138 ngx_uint_t i;
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174
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139 ngx_http_header_val_t *h;
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140 ngx_http_headers_conf_t *conf;
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141
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326
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142 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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143
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144 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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145 || r != r->main
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212
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146 || (r->headers_out.status != NGX_HTTP_OK
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147 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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148 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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149 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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150 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED))
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92
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151 {
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50
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152 return ngx_http_next_header_filter(r);
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153 }
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154
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155 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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156 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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157 return NGX_ERROR;
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158 }
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159 }
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58
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160
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326
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161 if (conf->headers) {
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162 h = conf->headers->elts;
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163 for (i = 0; i < conf->headers->nelts; i++) {
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50
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164
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326
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165 if (h[i].lengths == NULL) {
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166 value = h[i].value.value;
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58
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167
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326
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168 } else {
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169 if (ngx_http_script_run(r, &value, h[i].lengths->elts, 0,
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170 h[i].values->elts)
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171 == NULL)
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172 {
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173 return NGX_ERROR;
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174 }
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58
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175 }
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176
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326
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177 if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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178 return NGX_ERROR;
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179 }
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180 }
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181 }
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182
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326
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183 return ngx_http_next_header_filter(r);
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184 }
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185
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122
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186
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326
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187 static ngx_int_t
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188 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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189 {
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190 size_t len;
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394
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191 time_t now, expires_time, max_age;
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326
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192 ngx_uint_t i;
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193 ngx_table_elt_t *expires, *cc, **ccp;
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122
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194
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326
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195 expires = r->headers_out.expires;
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196
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197 if (expires == NULL) {
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198
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199 expires = ngx_list_push(&r->headers_out.headers);
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200 if (expires == NULL) {
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201 return NGX_ERROR;
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202 }
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122
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203
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326
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204 r->headers_out.expires = expires;
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205
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206 expires->hash = 1;
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207 expires->key.len = sizeof("Expires") - 1;
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208 expires->key.data = (u_char *) "Expires";
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209 }
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210
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211 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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212 expires->value.len = len - 1;
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213
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214 ccp = r->headers_out.cache_control.elts;
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215
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216 if (ccp == NULL) {
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217
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218 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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219 1, sizeof(ngx_table_elt_t *))
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220 != NGX_OK)
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221 {
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222 return NGX_ERROR;
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122
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223 }
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224
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225 ccp = ngx_array_push(&r->headers_out.cache_control);
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226 if (ccp == 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 = ngx_list_push(&r->headers_out.headers);
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231 if (cc == NULL) {
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232 return NGX_ERROR;
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233 }
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234
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235 cc->hash = 1;
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236 cc->key.len = sizeof("Cache-Control") - 1;
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237 cc->key.data = (u_char *) "Cache-Control";
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238
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239 *ccp = cc;
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326
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240
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241 } else {
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242 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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243 ccp[i]->hash = 0;
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244 }
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245
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246 cc = ccp[0];
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247 }
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248
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249 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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250 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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251
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252 cc->value.len = sizeof("no-cache") - 1;
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253 cc->value.data = (u_char *) "no-cache";
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254
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255 return NGX_OK;
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256 }
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257
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258 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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259 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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260
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261 /* 10 years */
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262 cc->value.len = sizeof("max-age=315360000") - 1;
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263 cc->value.data = (u_char *) "max-age=315360000";
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264
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265 return NGX_OK;
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266 }
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267
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382
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268 expires->value.data = ngx_pnalloc(r->pool, len);
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326
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269 if (expires->value.data == NULL) {
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270 return NGX_ERROR;
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271 }
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272
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376
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273 if (conf->expires_time == 0) {
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326
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274 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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275 ngx_cached_http_time.len + 1);
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276
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277 cc->value.len = sizeof("max-age=0") - 1;
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278 cc->value.data = (u_char *) "max-age=0";
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279
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280 return NGX_OK;
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122
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281 }
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282
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394
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283 now = ngx_time();
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284
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376
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285 if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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286 || r->headers_out.last_modified_time == -1)
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287 {
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394
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288 expires_time = now + conf->expires_time;
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289 max_age = conf->expires_time;
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290
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291 } else if (conf->expires == NGX_HTTP_EXPIRES_DAILY) {
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292 expires_time = ngx_next_time(conf->expires_time);
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293 max_age = expires_time - now;
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326
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294
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376
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295 } else {
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394
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296 expires_time = r->headers_out.last_modified_time + conf->expires_time;
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297 max_age = expires_time - now;
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376
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298 }
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299
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394
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300 ngx_http_time(expires->value.data, expires_time);
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376
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301
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302 if (conf->expires_time < 0) {
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326
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303 cc->value.len = sizeof("no-cache") - 1;
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304 cc->value.data = (u_char *) "no-cache";
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305
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306 return NGX_OK;
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307 }
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122
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308
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382
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309 cc->value.data = ngx_pnalloc(r->pool,
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310 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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326
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311 if (cc->value.data == NULL) {
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312 return NGX_ERROR;
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313 }
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314
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394
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315 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
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326
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316 - cc->value.data;
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317
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318 return NGX_OK;
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319 }
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320
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321
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322 static ngx_int_t
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323 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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324 ngx_str_t *value)
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325 {
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326 ngx_table_elt_t *h;
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174
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327
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430
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328 if (value->len) {
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329 h = ngx_list_push(&r->headers_out.headers);
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330 if (h == NULL) {
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331 return NGX_ERROR;
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332 }
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333
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334 h->hash = hv->value.hash;
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335 h->key = hv->value.key;
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336 h->value = *value;
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326
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337 }
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338
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339 return NGX_OK;
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340 }
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341
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174
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342
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326
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343 static ngx_int_t
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344 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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345 ngx_str_t *value)
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346 {
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347 ngx_table_elt_t *cc, **ccp;
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348
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349 ccp = r->headers_out.cache_control.elts;
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350
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351 if (ccp == NULL) {
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352
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353 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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354 1, sizeof(ngx_table_elt_t *))
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355 != NGX_OK)
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356 {
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357 return NGX_ERROR;
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122
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358 }
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359 }
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360
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326
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361 ccp = ngx_array_push(&r->headers_out.cache_control);
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362 if (ccp == NULL) {
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363 return NGX_ERROR;
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364 }
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365
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366 cc = ngx_list_push(&r->headers_out.headers);
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367 if (cc == NULL) {
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368 return NGX_ERROR;
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369 }
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370
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371 cc->hash = 1;
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372 cc->key.len = sizeof("Cache-Control") - 1;
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373 cc->key.data = (u_char *) "Cache-Control";
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374 cc->value = *value;
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375
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376 *ccp = cc;
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377
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378 return NGX_OK;
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379 }
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380
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381
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382 static ngx_int_t
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383 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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384 ngx_str_t *value)
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385 {
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386 ngx_table_elt_t *h, **old;
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387
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388 if (hv->offset) {
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389 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
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390
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391 } else {
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392 old = NULL;
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393 }
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394
|
|
348
|
395 r->headers_out.last_modified_time = -1;
|
|
|
396
|
|
326
|
397 if (old == NULL || *old == NULL) {
|
|
348
|
398
|
|
|
399 if (value->len == 0) {
|
|
|
400 return NGX_OK;
|
|
|
401 }
|
|
|
402
|
|
326
|
403 h = ngx_list_push(&r->headers_out.headers);
|
|
|
404 if (h == NULL) {
|
|
|
405 return NGX_ERROR;
|
|
|
406 }
|
|
|
407
|
|
|
408 } else {
|
|
|
409 h = *old;
|
|
348
|
410
|
|
|
411 if (value->len == 0) {
|
|
|
412 h->hash = 0;
|
|
|
413 return NGX_OK;
|
|
|
414 }
|
|
326
|
415 }
|
|
|
416
|
|
|
417 h->hash = hv->value.hash;
|
|
|
418 h->key = hv->value.key;
|
|
|
419 h->value = *value;
|
|
|
420
|
|
|
421 return NGX_OK;
|
|
50
|
422 }
|
|
|
423
|
|
|
424
|
|
|
425 static void *
|
|
|
426 ngx_http_headers_create_conf(ngx_conf_t *cf)
|
|
126
|
427 {
|
|
50
|
428 ngx_http_headers_conf_t *conf;
|
|
|
429
|
|
122
|
430 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
|
|
50
|
431 if (conf == NULL) {
|
|
|
432 return NGX_CONF_ERROR;
|
|
|
433 }
|
|
|
434
|
|
122
|
435 /*
|
|
|
436 * set by ngx_pcalloc():
|
|
|
437 *
|
|
|
438 * conf->headers = NULL;
|
|
376
|
439 * conf->expires_time = 0;
|
|
122
|
440 */
|
|
|
441
|
|
376
|
442 conf->expires = NGX_CONF_UNSET_UINT;
|
|
50
|
443
|
|
|
444 return conf;
|
|
|
445 }
|
|
|
446
|
|
|
447
|
|
|
448 static char *
|
|
|
449 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
450 {
|
|
|
451 ngx_http_headers_conf_t *prev = parent;
|
|
|
452 ngx_http_headers_conf_t *conf = child;
|
|
|
453
|
|
376
|
454 if (conf->expires == NGX_CONF_UNSET_UINT) {
|
|
|
455 conf->expires = prev->expires;
|
|
|
456 conf->expires_time = prev->expires_time;
|
|
|
457
|
|
|
458 if (conf->expires == NGX_CONF_UNSET_UINT) {
|
|
|
459 conf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
460 }
|
|
122
|
461 }
|
|
|
462
|
|
|
463 if (conf->headers == NULL) {
|
|
|
464 conf->headers = prev->headers;
|
|
|
465 }
|
|
|
466
|
|
50
|
467 return NGX_CONF_OK;
|
|
|
468 }
|
|
|
469
|
|
|
470
|
|
230
|
471 static ngx_int_t
|
|
|
472 ngx_http_headers_filter_init(ngx_conf_t *cf)
|
|
|
473 {
|
|
|
474 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
475 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
|
476
|
|
|
477 return NGX_OK;
|
|
|
478 }
|
|
|
479
|
|
|
480
|
|
50
|
481 static char *
|
|
|
482 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
483 {
|
|
|
484 ngx_http_headers_conf_t *hcf = conf;
|
|
|
485
|
|
376
|
486 ngx_uint_t minus, n;
|
|
50
|
487 ngx_str_t *value;
|
|
|
488
|
|
376
|
489 if (hcf->expires != NGX_CONF_UNSET_UINT) {
|
|
50
|
490 return "is duplicate";
|
|
|
491 }
|
|
|
492
|
|
|
493 value = cf->args->elts;
|
|
|
494
|
|
376
|
495 if (cf->args->nelts == 2) {
|
|
|
496
|
|
|
497 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
|
498 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
|
499 return NGX_CONF_OK;
|
|
|
500 }
|
|
|
501
|
|
|
502 if (ngx_strcmp(value[1].data, "max") == 0) {
|
|
|
503 hcf->expires = NGX_HTTP_EXPIRES_MAX;
|
|
|
504 return NGX_CONF_OK;
|
|
|
505 }
|
|
50
|
506
|
|
376
|
507 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
|
508 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
509 return NGX_CONF_OK;
|
|
|
510 }
|
|
|
511
|
|
|
512 hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
|
|
|
513
|
|
|
514 n = 1;
|
|
|
515
|
|
|
516 } else { /* cf->args->nelts == 3 */
|
|
|
517
|
|
|
518 if (ngx_strcmp(value[1].data, "modified") != 0) {
|
|
|
519 return "invalid value";
|
|
|
520 }
|
|
|
521
|
|
|
522 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
|
|
|
523
|
|
|
524 n = 2;
|
|
238
|
525 }
|
|
|
526
|
|
394
|
527 if (value[n].data[0] == '@') {
|
|
|
528 value[n].data++;
|
|
|
529 value[n].len--;
|
|
|
530 minus = 0;
|
|
|
531
|
|
|
532 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) {
|
|
|
533 return "daily time can not be used with \"modified\" parameter";
|
|
|
534 }
|
|
|
535
|
|
|
536 hcf->expires = NGX_HTTP_EXPIRES_DAILY;
|
|
|
537
|
|
|
538 } else if (value[n].data[0] == '+') {
|
|
376
|
539 value[n].data++;
|
|
|
540 value[n].len--;
|
|
50
|
541 minus = 0;
|
|
|
542
|
|
376
|
543 } else if (value[n].data[0] == '-') {
|
|
|
544 value[n].data++;
|
|
|
545 value[n].len--;
|
|
50
|
546 minus = 1;
|
|
|
547
|
|
|
548 } else {
|
|
|
549 minus = 0;
|
|
|
550 }
|
|
|
551
|
|
376
|
552 hcf->expires_time = ngx_parse_time(&value[n], 1);
|
|
50
|
553
|
|
376
|
554 if (hcf->expires_time == NGX_ERROR) {
|
|
50
|
555 return "invalid value";
|
|
|
556 }
|
|
126
|
557
|
|
394
|
558 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY
|
|
|
559 && hcf->expires_time > 24 * 60 * 60)
|
|
|
560 {
|
|
|
561 return "daily time value must be less than 24 hours";
|
|
|
562 }
|
|
|
563
|
|
376
|
564 if (hcf->expires_time == NGX_PARSE_LARGE_TIME) {
|
|
50
|
565 return "value must be less than 68 years";
|
|
|
566 }
|
|
|
567
|
|
|
568 if (minus) {
|
|
376
|
569 hcf->expires_time = - hcf->expires_time;
|
|
50
|
570 }
|
|
|
571
|
|
|
572 return NGX_CONF_OK;
|
|
|
573 }
|
|
122
|
574
|
|
|
575
|
|
|
576 static char *
|
|
|
577 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
578 {
|
|
|
579 ngx_http_headers_conf_t *hcf = conf;
|
|
|
580
|
|
174
|
581 ngx_int_t n;
|
|
|
582 ngx_str_t *value;
|
|
326
|
583 ngx_uint_t i;
|
|
174
|
584 ngx_http_header_val_t *h;
|
|
326
|
585 ngx_http_set_header_t *sh;
|
|
174
|
586 ngx_http_script_compile_t sc;
|
|
122
|
587
|
|
|
588 value = cf->args->elts;
|
|
|
589
|
|
|
590 if (hcf->headers == NULL) {
|
|
174
|
591 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
592 sizeof(ngx_http_header_val_t));
|
|
122
|
593 if (hcf->headers == NULL) {
|
|
|
594 return NGX_CONF_ERROR;
|
|
|
595 }
|
|
|
596 }
|
|
|
597
|
|
|
598 h = ngx_array_push(hcf->headers);
|
|
|
599 if (h == NULL) {
|
|
|
600 return NGX_CONF_ERROR;
|
|
|
601 }
|
|
|
602
|
|
174
|
603 h->value.hash = 1;
|
|
|
604 h->value.key = value[1];
|
|
|
605 h->value.value = value[2];
|
|
326
|
606 h->offset = 0;
|
|
|
607 h->handler = ngx_http_add_header;
|
|
174
|
608 h->lengths = NULL;
|
|
|
609 h->values = NULL;
|
|
|
610
|
|
326
|
611 sh = ngx_http_set_headers;
|
|
|
612 for (i = 0; sh[i].name.len; i++) {
|
|
|
613 if (ngx_strcasecmp(value[1].data, sh[i].name.data) != 0) {
|
|
|
614 continue;
|
|
|
615 }
|
|
|
616
|
|
|
617 h->offset = sh[i].offset;
|
|
|
618 h->handler = sh[i].handler;
|
|
|
619 break;
|
|
|
620 }
|
|
|
621
|
|
174
|
622 n = ngx_http_script_variables_count(&value[2]);
|
|
|
623
|
|
|
624 if (n == 0) {
|
|
|
625 return NGX_CONF_OK;
|
|
|
626 }
|
|
|
627
|
|
|
628 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
|
|
|
629
|
|
|
630 sc.cf = cf;
|
|
|
631 sc.source = &value[2];
|
|
|
632 sc.lengths = &h->lengths;
|
|
|
633 sc.values = &h->values;
|
|
|
634 sc.variables = n;
|
|
|
635 sc.complete_lengths = 1;
|
|
|
636 sc.complete_values = 1;
|
|
|
637
|
|
|
638 if (ngx_http_script_compile(&sc) != NGX_OK) {
|
|
|
639 return NGX_CONF_ERROR;
|
|
|
640 }
|
|
122
|
641
|
|
|
642 return NGX_CONF_OK;
|
|
|
643 }
|
