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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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34 typedef struct {
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35 time_t expires;
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36 ngx_array_t *headers;
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50
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37 } ngx_http_headers_conf_t;
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38
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39
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40 #define NGX_HTTP_EXPIRES_UNSET -2147483647
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41 #define NGX_HTTP_EXPIRES_OFF -2147483646
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42 #define NGX_HTTP_EXPIRES_EPOCH -2147483645
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238
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43 #define NGX_HTTP_EXPIRES_MAX -2147483644
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50
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44
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45
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326
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46 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r,
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47 ngx_http_headers_conf_t *conf);
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48 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r,
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49 ngx_http_header_val_t *hv, ngx_str_t *value);
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50 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r,
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51 ngx_http_header_val_t *hv, ngx_str_t *value);
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52
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50
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53 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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54 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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55 void *parent, void *child);
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230
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56 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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50
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57 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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58 void *conf);
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122
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59 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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60 void *conf);
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50
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61
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62
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326
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63 static ngx_http_set_header_t ngx_http_set_headers[] = {
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64
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65 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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66
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67 { ngx_string("Last-Modified"),
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68 offsetof(ngx_http_headers_out_t, last_modified),
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69 ngx_http_set_last_modified },
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70
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71 { ngx_null_string, 0, NULL }
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72 };
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73
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74
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50
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75 static ngx_command_t ngx_http_headers_filter_commands[] = {
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76
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77 { ngx_string("expires"),
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122
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78 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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79 |NGX_CONF_TAKE1,
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80 ngx_http_headers_expires,
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81 NGX_HTTP_LOC_CONF_OFFSET,
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82 0,
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83 NULL},
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84
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122
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85 { ngx_string("add_header"),
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86 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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87 |NGX_CONF_TAKE2,
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88 ngx_http_headers_add,
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89 NGX_HTTP_LOC_CONF_OFFSET,
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90 0,
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91 NULL},
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92
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50
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93 ngx_null_command
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94 };
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95
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96
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97 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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98 NULL, /* preconfiguration */
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230
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99 ngx_http_headers_filter_init, /* postconfiguration */
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100
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101 NULL, /* create main configuration */
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102 NULL, /* init main configuration */
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103
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104 NULL, /* create server configuration */
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105 NULL, /* merge server configuration */
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106
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107 ngx_http_headers_create_conf, /* create location configuration */
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108 ngx_http_headers_merge_conf /* merge location configuration */
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109 };
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110
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111
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112 ngx_module_t ngx_http_headers_filter_module = {
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58
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113 NGX_MODULE_V1,
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114 &ngx_http_headers_filter_module_ctx, /* module context */
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115 ngx_http_headers_filter_commands, /* module directives */
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116 NGX_HTTP_MODULE, /* module type */
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90
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117 NULL, /* init master */
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230
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118 NULL, /* init module */
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90
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119 NULL, /* init process */
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120 NULL, /* init thread */
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121 NULL, /* exit thread */
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122 NULL, /* exit process */
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123 NULL, /* exit master */
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124 NGX_MODULE_V1_PADDING
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50
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125 };
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126
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127
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128 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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129
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130
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131 static ngx_int_t
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132 ngx_http_headers_filter(ngx_http_request_t *r)
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133 {
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326
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134 ngx_str_t value;
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58
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135 ngx_uint_t i;
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174
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136 ngx_http_header_val_t *h;
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137 ngx_http_headers_conf_t *conf;
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138
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326
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139 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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140
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141 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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142 || r != r->main
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212
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143 || (r->headers_out.status != NGX_HTTP_OK
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144 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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145 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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146 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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147 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED))
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92
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148 {
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149 return ngx_http_next_header_filter(r);
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150 }
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151
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152 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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153 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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154 return NGX_ERROR;
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155 }
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156 }
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58
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157
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326
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158 if (conf->headers) {
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159 h = conf->headers->elts;
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160 for (i = 0; i < conf->headers->nelts; i++) {
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161
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326
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162 if (h[i].lengths == NULL) {
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163 value = h[i].value.value;
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58
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164
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326
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165 } else {
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166 if (ngx_http_script_run(r, &value, h[i].lengths->elts, 0,
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167 h[i].values->elts)
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168 == NULL)
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169 {
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170 return NGX_ERROR;
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171 }
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58
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172 }
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173
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326
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174 if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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175 return NGX_ERROR;
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176 }
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177 }
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178 }
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179
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326
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180 return ngx_http_next_header_filter(r);
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181 }
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182
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122
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183
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326
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184 static ngx_int_t
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185 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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186 {
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187 size_t len;
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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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203 expires->key.len = sizeof("Expires") - 1;
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204 expires->key.data = (u_char *) "Expires";
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205 }
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206
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207 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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208 expires->value.len = len - 1;
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209
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210 ccp = r->headers_out.cache_control.elts;
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211
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212 if (ccp == NULL) {
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213
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214 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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215 1, sizeof(ngx_table_elt_t *))
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216 != NGX_OK)
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217 {
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218 return NGX_ERROR;
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122
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219 }
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220
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221 ccp = ngx_array_push(&r->headers_out.cache_control);
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222 if (ccp == NULL) {
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223 return NGX_ERROR;
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224 }
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225
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226 cc = ngx_list_push(&r->headers_out.headers);
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227 if (cc == NULL) {
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228 return NGX_ERROR;
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229 }
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230
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231 cc->hash = 1;
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232 cc->key.len = sizeof("Cache-Control") - 1;
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233 cc->key.data = (u_char *) "Cache-Control";
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234
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235 *ccp = cc;
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326
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236
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237 } else {
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238 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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239 ccp[i]->hash = 0;
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240 }
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241
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242 cc = ccp[0];
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243 }
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244
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245 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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246 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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247
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248 cc->value.len = sizeof("no-cache") - 1;
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249 cc->value.data = (u_char *) "no-cache";
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250
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251 return NGX_OK;
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252 }
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253
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254 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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255 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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256
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257 /* 10 years */
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258 cc->value.len = sizeof("max-age=315360000") - 1;
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259 cc->value.data = (u_char *) "max-age=315360000";
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260
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261 return NGX_OK;
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262 }
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263
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264 expires->value.data = ngx_palloc(r->pool, len);
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265 if (expires->value.data == NULL) {
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266 return NGX_ERROR;
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267 }
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268
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269 if (conf->expires == 0) {
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270 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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271 ngx_cached_http_time.len + 1);
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272
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273 cc->value.len = sizeof("max-age=0") - 1;
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274 cc->value.data = (u_char *) "max-age=0";
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275
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276 return NGX_OK;
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122
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277 }
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278
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326
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279 ngx_http_time(expires->value.data, ngx_time() + conf->expires);
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280
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281 if (conf->expires < 0) {
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282 cc->value.len = sizeof("no-cache") - 1;
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283 cc->value.data = (u_char *) "no-cache";
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284
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285 return NGX_OK;
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286 }
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122
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287
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326
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288 cc->value.data = ngx_palloc(r->pool,
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289 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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290 if (cc->value.data == NULL) {
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291 return NGX_ERROR;
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292 }
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293
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294 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", conf->expires)
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295 - cc->value.data;
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296
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297 return NGX_OK;
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298 }
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299
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300
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301 static ngx_int_t
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302 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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303 ngx_str_t *value)
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304 {
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305 ngx_table_elt_t *h;
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174
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306
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326
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307 h = ngx_list_push(&r->headers_out.headers);
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308 if (h == NULL) {
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309 return NGX_ERROR;
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310 }
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311
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312 h->hash = hv->value.hash;
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313 h->key = hv->value.key;
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314 h->value = *value;
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315
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316 return NGX_OK;
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317 }
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318
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174
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319
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326
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320 static ngx_int_t
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321 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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322 ngx_str_t *value)
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323 {
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324 ngx_table_elt_t *cc, **ccp;
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325
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326 ccp = r->headers_out.cache_control.elts;
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327
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328 if (ccp == NULL) {
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329
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330 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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331 1, sizeof(ngx_table_elt_t *))
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332 != NGX_OK)
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333 {
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334 return NGX_ERROR;
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122
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335 }
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336 }
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337
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326
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338 ccp = ngx_array_push(&r->headers_out.cache_control);
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339 if (ccp == NULL) {
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340 return NGX_ERROR;
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341 }
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342
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343 cc = ngx_list_push(&r->headers_out.headers);
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344 if (cc == 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->hash = 1;
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349 cc->key.len = sizeof("Cache-Control") - 1;
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350 cc->key.data = (u_char *) "Cache-Control";
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351 cc->value = *value;
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352
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353 *ccp = cc;
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354
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355 return NGX_OK;
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356 }
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357
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358
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359 static ngx_int_t
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360 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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361 ngx_str_t *value)
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362 {
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363 ngx_table_elt_t *h, **old;
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364
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365 if (hv->offset) {
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366 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
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367
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368 } else {
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369 old = NULL;
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370 }
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371
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372 if (old == NULL || *old == NULL) {
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373 h = ngx_list_push(&r->headers_out.headers);
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374 if (h == NULL) {
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375 return NGX_ERROR;
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376 }
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377
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378 } else {
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379 h = *old;
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380 }
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381
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382 h->hash = hv->value.hash;
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383 h->key = hv->value.key;
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384 h->value = *value;
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385
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386 r->headers_out.last_modified_time = -1;
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387
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388 return NGX_OK;
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50
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389 }
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390
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391
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392 static void *
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393 ngx_http_headers_create_conf(ngx_conf_t *cf)
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126
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394 {
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50
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395 ngx_http_headers_conf_t *conf;
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396
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122
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397 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
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50
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398 if (conf == NULL) {
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399 return NGX_CONF_ERROR;
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|
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400 }
|
|
|
401
|
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122
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402 /*
|
|
|
403 * set by ngx_pcalloc():
|
|
|
404 *
|
|
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405 * conf->headers = NULL;
|
|
|
406 */
|
|
|
407
|
|
50
|
408 conf->expires = NGX_HTTP_EXPIRES_UNSET;
|
|
|
409
|
|
|
410 return conf;
|
|
|
411 }
|
|
|
412
|
|
|
413
|
|
|
414 static char *
|
|
|
415 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
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416 {
|
|
|
417 ngx_http_headers_conf_t *prev = parent;
|
|
|
418 ngx_http_headers_conf_t *conf = child;
|
|
|
419
|
|
|
420 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
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|
|
421 conf->expires = (prev->expires == NGX_HTTP_EXPIRES_UNSET) ?
|
|
326
|
422 NGX_HTTP_EXPIRES_OFF : prev->expires;
|
|
122
|
423 }
|
|
|
424
|
|
|
425 if (conf->headers == NULL) {
|
|
|
426 conf->headers = prev->headers;
|
|
|
427 }
|
|
|
428
|
|
50
|
429 return NGX_CONF_OK;
|
|
|
430 }
|
|
|
431
|
|
|
432
|
|
230
|
433 static ngx_int_t
|
|
|
434 ngx_http_headers_filter_init(ngx_conf_t *cf)
|
|
|
435 {
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|
|
436 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
437 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
|
438
|
|
|
439 return NGX_OK;
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|
|
440 }
|
|
|
441
|
|
|
442
|
|
50
|
443 static char *
|
|
|
444 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
445 {
|
|
|
446 ngx_http_headers_conf_t *hcf = conf;
|
|
|
447
|
|
|
448 ngx_uint_t minus;
|
|
|
449 ngx_str_t *value;
|
|
|
450
|
|
|
451 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
|
|
|
452 return "is duplicate";
|
|
|
453 }
|
|
|
454
|
|
|
455 value = cf->args->elts;
|
|
|
456
|
|
|
457 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
|
458 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
|
459 return NGX_CONF_OK;
|
|
|
460 }
|
|
|
461
|
|
238
|
462 if (ngx_strcmp(value[1].data, "max") == 0) {
|
|
|
463 hcf->expires = NGX_HTTP_EXPIRES_MAX;
|
|
|
464 return NGX_CONF_OK;
|
|
|
465 }
|
|
|
466
|
|
50
|
467 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
|
468 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
469 return NGX_CONF_OK;
|
|
|
470 }
|
|
|
471
|
|
|
472 if (value[1].data[0] == '+') {
|
|
|
473 value[1].data++;
|
|
|
474 value[1].len--;
|
|
|
475 minus = 0;
|
|
|
476
|
|
|
477 } else if (value[1].data[0] == '-') {
|
|
|
478 value[1].data++;
|
|
|
479 value[1].len--;
|
|
|
480 minus = 1;
|
|
|
481
|
|
|
482 } else {
|
|
|
483 minus = 0;
|
|
|
484 }
|
|
|
485
|
|
|
486 hcf->expires = ngx_parse_time(&value[1], 1);
|
|
|
487
|
|
|
488 if (hcf->expires == NGX_ERROR) {
|
|
|
489 return "invalid value";
|
|
|
490 }
|
|
126
|
491
|
|
50
|
492 if (hcf->expires == NGX_PARSE_LARGE_TIME) {
|
|
|
493 return "value must be less than 68 years";
|
|
|
494 }
|
|
|
495
|
|
|
496 if (minus) {
|
|
|
497 hcf->expires = - hcf->expires;
|
|
|
498 }
|
|
|
499
|
|
|
500 return NGX_CONF_OK;
|
|
|
501 }
|
|
122
|
502
|
|
|
503
|
|
|
504 static char *
|
|
|
505 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
506 {
|
|
|
507 ngx_http_headers_conf_t *hcf = conf;
|
|
|
508
|
|
174
|
509 ngx_int_t n;
|
|
|
510 ngx_str_t *value;
|
|
326
|
511 ngx_uint_t i;
|
|
174
|
512 ngx_http_header_val_t *h;
|
|
326
|
513 ngx_http_set_header_t *sh;
|
|
174
|
514 ngx_http_script_compile_t sc;
|
|
122
|
515
|
|
|
516 value = cf->args->elts;
|
|
|
517
|
|
|
518 if (hcf->headers == NULL) {
|
|
174
|
519 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
520 sizeof(ngx_http_header_val_t));
|
|
122
|
521 if (hcf->headers == NULL) {
|
|
|
522 return NGX_CONF_ERROR;
|
|
|
523 }
|
|
|
524 }
|
|
|
525
|
|
|
526 h = ngx_array_push(hcf->headers);
|
|
|
527 if (h == NULL) {
|
|
|
528 return NGX_CONF_ERROR;
|
|
|
529 }
|
|
|
530
|
|
174
|
531 h->value.hash = 1;
|
|
|
532 h->value.key = value[1];
|
|
|
533 h->value.value = value[2];
|
|
326
|
534 h->offset = 0;
|
|
|
535 h->handler = ngx_http_add_header;
|
|
174
|
536 h->lengths = NULL;
|
|
|
537 h->values = NULL;
|
|
|
538
|
|
326
|
539 sh = ngx_http_set_headers;
|
|
|
540 for (i = 0; sh[i].name.len; i++) {
|
|
|
541 if (ngx_strcasecmp(value[1].data, sh[i].name.data) != 0) {
|
|
|
542 continue;
|
|
|
543 }
|
|
|
544
|
|
|
545 h->offset = sh[i].offset;
|
|
|
546 h->handler = sh[i].handler;
|
|
|
547 break;
|
|
|
548 }
|
|
|
549
|
|
174
|
550 n = ngx_http_script_variables_count(&value[2]);
|
|
|
551
|
|
|
552 if (n == 0) {
|
|
|
553 return NGX_CONF_OK;
|
|
|
554 }
|
|
|
555
|
|
|
556 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
|
|
|
557
|
|
|
558 sc.cf = cf;
|
|
|
559 sc.source = &value[2];
|
|
|
560 sc.lengths = &h->lengths;
|
|
|
561 sc.values = &h->values;
|
|
|
562 sc.variables = n;
|
|
|
563 sc.complete_lengths = 1;
|
|
|
564 sc.complete_values = 1;
|
|
|
565
|
|
|
566 if (ngx_http_script_compile(&sc) != NGX_OK) {
|
|
|
567 return NGX_CONF_ERROR;
|
|
|
568 }
|
|
122
|
569
|
|
|
570 return NGX_CONF_OK;
|
|
|
571 }
|
