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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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39
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40
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326
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41 typedef struct {
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376
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42 ngx_uint_t expires;
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43 time_t expires_time;
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326
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44 ngx_array_t *headers;
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50
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45 } ngx_http_headers_conf_t;
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46
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47
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326
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48 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r,
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49 ngx_http_headers_conf_t *conf);
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50 static ngx_int_t ngx_http_add_cache_control(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 static ngx_int_t ngx_http_set_last_modified(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
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50
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55 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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56 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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57 void *parent, void *child);
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230
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58 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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50
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59 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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60 void *conf);
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122
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61 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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62 void *conf);
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63
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64
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326
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65 static ngx_http_set_header_t ngx_http_set_headers[] = {
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66
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67 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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68
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69 { ngx_string("Last-Modified"),
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70 offsetof(ngx_http_headers_out_t, last_modified),
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71 ngx_http_set_last_modified },
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72
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73 { ngx_null_string, 0, NULL }
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74 };
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75
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76
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50
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77 static ngx_command_t ngx_http_headers_filter_commands[] = {
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78
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79 { ngx_string("expires"),
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122
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80 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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81 |NGX_CONF_TAKE12,
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50
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82 ngx_http_headers_expires,
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83 NGX_HTTP_LOC_CONF_OFFSET,
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84 0,
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85 NULL},
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86
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122
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87 { ngx_string("add_header"),
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88 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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89 |NGX_CONF_TAKE2,
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90 ngx_http_headers_add,
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91 NGX_HTTP_LOC_CONF_OFFSET,
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92 0,
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93 NULL},
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94
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50
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95 ngx_null_command
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96 };
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97
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98
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99 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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100 NULL, /* preconfiguration */
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230
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101 ngx_http_headers_filter_init, /* postconfiguration */
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50
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102
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103 NULL, /* create main configuration */
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104 NULL, /* init main configuration */
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105
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106 NULL, /* create server configuration */
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107 NULL, /* merge server configuration */
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108
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109 ngx_http_headers_create_conf, /* create location configuration */
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110 ngx_http_headers_merge_conf /* merge location configuration */
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111 };
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112
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113
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114 ngx_module_t ngx_http_headers_filter_module = {
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58
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115 NGX_MODULE_V1,
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116 &ngx_http_headers_filter_module_ctx, /* module context */
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117 ngx_http_headers_filter_commands, /* module directives */
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118 NGX_HTTP_MODULE, /* module type */
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90
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119 NULL, /* init master */
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230
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120 NULL, /* init module */
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90
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121 NULL, /* init process */
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122 NULL, /* init thread */
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123 NULL, /* exit thread */
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124 NULL, /* exit process */
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125 NULL, /* exit master */
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126 NGX_MODULE_V1_PADDING
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50
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127 };
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128
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129
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130 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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131
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132
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133 static ngx_int_t
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134 ngx_http_headers_filter(ngx_http_request_t *r)
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135 {
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326
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136 ngx_str_t value;
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58
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137 ngx_uint_t i;
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174
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138 ngx_http_header_val_t *h;
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50
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139 ngx_http_headers_conf_t *conf;
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140
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326
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141 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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142
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143 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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144 || r != r->main
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212
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145 || (r->headers_out.status != NGX_HTTP_OK
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146 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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147 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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148 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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149 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED))
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92
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150 {
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50
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151 return ngx_http_next_header_filter(r);
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152 }
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153
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154 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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155 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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156 return NGX_ERROR;
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157 }
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158 }
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58
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159
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326
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160 if (conf->headers) {
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161 h = conf->headers->elts;
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162 for (i = 0; i < conf->headers->nelts; i++) {
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50
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163
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326
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164 if (h[i].lengths == NULL) {
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165 value = h[i].value.value;
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58
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166
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326
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167 } else {
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168 if (ngx_http_script_run(r, &value, h[i].lengths->elts, 0,
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169 h[i].values->elts)
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170 == NULL)
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171 {
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172 return NGX_ERROR;
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173 }
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58
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174 }
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175
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326
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176 if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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177 return NGX_ERROR;
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178 }
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179 }
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180 }
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181
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326
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182 return ngx_http_next_header_filter(r);
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183 }
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184
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122
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185
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326
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186 static ngx_int_t
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187 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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188 {
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189 size_t len;
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376
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190 time_t since;
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326
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191 ngx_uint_t i;
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192 ngx_table_elt_t *expires, *cc, **ccp;
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122
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193
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326
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194 expires = r->headers_out.expires;
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195
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196 if (expires == NULL) {
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197
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198 expires = ngx_list_push(&r->headers_out.headers);
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199 if (expires == NULL) {
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200 return NGX_ERROR;
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201 }
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122
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202
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326
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203 r->headers_out.expires = expires;
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204
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205 expires->hash = 1;
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206 expires->key.len = sizeof("Expires") - 1;
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207 expires->key.data = (u_char *) "Expires";
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208 }
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209
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210 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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211 expires->value.len = len - 1;
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212
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213 ccp = r->headers_out.cache_control.elts;
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214
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215 if (ccp == NULL) {
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216
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217 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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218 1, sizeof(ngx_table_elt_t *))
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219 != NGX_OK)
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220 {
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221 return NGX_ERROR;
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122
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222 }
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223
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224 ccp = ngx_array_push(&r->headers_out.cache_control);
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225 if (ccp == NULL) {
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226 return NGX_ERROR;
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227 }
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228
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229 cc = ngx_list_push(&r->headers_out.headers);
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230 if (cc == NULL) {
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231 return NGX_ERROR;
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232 }
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233
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234 cc->hash = 1;
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235 cc->key.len = sizeof("Cache-Control") - 1;
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236 cc->key.data = (u_char *) "Cache-Control";
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237
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238 *ccp = cc;
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326
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239
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240 } else {
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241 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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242 ccp[i]->hash = 0;
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243 }
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244
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245 cc = ccp[0];
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246 }
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247
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248 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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249 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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250
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251 cc->value.len = sizeof("no-cache") - 1;
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252 cc->value.data = (u_char *) "no-cache";
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253
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254 return NGX_OK;
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255 }
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256
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257 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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258 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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259
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260 /* 10 years */
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261 cc->value.len = sizeof("max-age=315360000") - 1;
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262 cc->value.data = (u_char *) "max-age=315360000";
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263
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264 return NGX_OK;
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265 }
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266
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267 expires->value.data = ngx_palloc(r->pool, len);
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268 if (expires->value.data == NULL) {
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269 return NGX_ERROR;
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270 }
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271
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376
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272 if (conf->expires_time == 0) {
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326
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273 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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274 ngx_cached_http_time.len + 1);
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275
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276 cc->value.len = sizeof("max-age=0") - 1;
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277 cc->value.data = (u_char *) "max-age=0";
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278
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279 return NGX_OK;
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122
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280 }
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281
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376
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282 if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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283 || r->headers_out.last_modified_time == -1)
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284 {
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285 since = ngx_time();
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326
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286
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376
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287 } else {
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288 since = r->headers_out.last_modified_time;
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289 }
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290
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291 ngx_http_time(expires->value.data, since + conf->expires_time);
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292
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293 if (conf->expires_time < 0) {
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326
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294 cc->value.len = sizeof("no-cache") - 1;
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295 cc->value.data = (u_char *) "no-cache";
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296
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297 return NGX_OK;
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298 }
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122
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299
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326
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300 cc->value.data = ngx_palloc(r->pool,
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301 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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302 if (cc->value.data == NULL) {
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303 return NGX_ERROR;
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304 }
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305
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376
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306 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T",
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307 since + conf->expires_time - ngx_time())
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326
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308 - cc->value.data;
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309
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310 return NGX_OK;
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311 }
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312
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313
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314 static ngx_int_t
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315 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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316 ngx_str_t *value)
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317 {
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318 ngx_table_elt_t *h;
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174
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319
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326
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320 h = ngx_list_push(&r->headers_out.headers);
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321 if (h == NULL) {
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322 return NGX_ERROR;
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323 }
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324
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325 h->hash = hv->value.hash;
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326 h->key = hv->value.key;
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327 h->value = *value;
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328
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329 return NGX_OK;
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330 }
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331
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174
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332
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326
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333 static ngx_int_t
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334 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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335 ngx_str_t *value)
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336 {
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337 ngx_table_elt_t *cc, **ccp;
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338
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339 ccp = r->headers_out.cache_control.elts;
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340
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341 if (ccp == NULL) {
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342
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343 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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344 1, sizeof(ngx_table_elt_t *))
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345 != NGX_OK)
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346 {
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347 return NGX_ERROR;
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122
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348 }
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349 }
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350
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326
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351 ccp = ngx_array_push(&r->headers_out.cache_control);
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352 if (ccp == NULL) {
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353 return NGX_ERROR;
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354 }
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355
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356 cc = ngx_list_push(&r->headers_out.headers);
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357 if (cc == NULL) {
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358 return NGX_ERROR;
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359 }
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360
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361 cc->hash = 1;
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362 cc->key.len = sizeof("Cache-Control") - 1;
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363 cc->key.data = (u_char *) "Cache-Control";
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364 cc->value = *value;
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365
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366 *ccp = cc;
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367
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368 return NGX_OK;
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369 }
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370
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371
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372 static ngx_int_t
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373 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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374 ngx_str_t *value)
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375 {
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376 ngx_table_elt_t *h, **old;
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377
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378 if (hv->offset) {
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379 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
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380
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381 } else {
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382 old = NULL;
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383 }
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384
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348
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385 r->headers_out.last_modified_time = -1;
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386
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326
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387 if (old == NULL || *old == NULL) {
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348
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388
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389 if (value->len == 0) {
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390 return NGX_OK;
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391 }
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392
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326
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393 h = ngx_list_push(&r->headers_out.headers);
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394 if (h == NULL) {
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395 return NGX_ERROR;
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396 }
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397
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398 } else {
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|
|
399 h = *old;
|
|
348
|
400
|
|
|
401 if (value->len == 0) {
|
|
|
402 h->hash = 0;
|
|
|
403 return NGX_OK;
|
|
|
404 }
|
|
326
|
405 }
|
|
|
406
|
|
|
407 h->hash = hv->value.hash;
|
|
|
408 h->key = hv->value.key;
|
|
|
409 h->value = *value;
|
|
|
410
|
|
|
411 return NGX_OK;
|
|
50
|
412 }
|
|
|
413
|
|
|
414
|
|
|
415 static void *
|
|
|
416 ngx_http_headers_create_conf(ngx_conf_t *cf)
|
|
126
|
417 {
|
|
50
|
418 ngx_http_headers_conf_t *conf;
|
|
|
419
|
|
122
|
420 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
|
|
50
|
421 if (conf == NULL) {
|
|
|
422 return NGX_CONF_ERROR;
|
|
|
423 }
|
|
|
424
|
|
122
|
425 /*
|
|
|
426 * set by ngx_pcalloc():
|
|
|
427 *
|
|
|
428 * conf->headers = NULL;
|
|
376
|
429 * conf->expires_time = 0;
|
|
122
|
430 */
|
|
|
431
|
|
376
|
432 conf->expires = NGX_CONF_UNSET_UINT;
|
|
50
|
433
|
|
|
434 return conf;
|
|
|
435 }
|
|
|
436
|
|
|
437
|
|
|
438 static char *
|
|
|
439 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
440 {
|
|
|
441 ngx_http_headers_conf_t *prev = parent;
|
|
|
442 ngx_http_headers_conf_t *conf = child;
|
|
|
443
|
|
376
|
444 if (conf->expires == NGX_CONF_UNSET_UINT) {
|
|
|
445 conf->expires = prev->expires;
|
|
|
446 conf->expires_time = prev->expires_time;
|
|
|
447
|
|
|
448 if (conf->expires == NGX_CONF_UNSET_UINT) {
|
|
|
449 conf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
450 }
|
|
122
|
451 }
|
|
|
452
|
|
|
453 if (conf->headers == NULL) {
|
|
|
454 conf->headers = prev->headers;
|
|
|
455 }
|
|
|
456
|
|
50
|
457 return NGX_CONF_OK;
|
|
|
458 }
|
|
|
459
|
|
|
460
|
|
230
|
461 static ngx_int_t
|
|
|
462 ngx_http_headers_filter_init(ngx_conf_t *cf)
|
|
|
463 {
|
|
|
464 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
465 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
|
466
|
|
|
467 return NGX_OK;
|
|
|
468 }
|
|
|
469
|
|
|
470
|
|
50
|
471 static char *
|
|
|
472 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
473 {
|
|
|
474 ngx_http_headers_conf_t *hcf = conf;
|
|
|
475
|
|
376
|
476 ngx_uint_t minus, n;
|
|
50
|
477 ngx_str_t *value;
|
|
|
478
|
|
376
|
479 if (hcf->expires != NGX_CONF_UNSET_UINT) {
|
|
50
|
480 return "is duplicate";
|
|
|
481 }
|
|
|
482
|
|
|
483 value = cf->args->elts;
|
|
|
484
|
|
376
|
485 if (cf->args->nelts == 2) {
|
|
|
486
|
|
|
487 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
|
488 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
|
489 return NGX_CONF_OK;
|
|
|
490 }
|
|
|
491
|
|
|
492 if (ngx_strcmp(value[1].data, "max") == 0) {
|
|
|
493 hcf->expires = NGX_HTTP_EXPIRES_MAX;
|
|
|
494 return NGX_CONF_OK;
|
|
|
495 }
|
|
50
|
496
|
|
376
|
497 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
|
498 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
499 return NGX_CONF_OK;
|
|
|
500 }
|
|
|
501
|
|
|
502 hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
|
|
|
503
|
|
|
504 n = 1;
|
|
|
505
|
|
|
506 } else { /* cf->args->nelts == 3 */
|
|
|
507
|
|
|
508 if (ngx_strcmp(value[1].data, "modified") != 0) {
|
|
|
509 return "invalid value";
|
|
|
510 }
|
|
|
511
|
|
|
512 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
|
|
|
513
|
|
|
514 n = 2;
|
|
238
|
515 }
|
|
|
516
|
|
376
|
517 if (value[n].data[0] == '+') {
|
|
|
518 value[n].data++;
|
|
|
519 value[n].len--;
|
|
50
|
520 minus = 0;
|
|
|
521
|
|
376
|
522 } else if (value[n].data[0] == '-') {
|
|
|
523 value[n].data++;
|
|
|
524 value[n].len--;
|
|
50
|
525 minus = 1;
|
|
|
526
|
|
|
527 } else {
|
|
|
528 minus = 0;
|
|
|
529 }
|
|
|
530
|
|
376
|
531 hcf->expires_time = ngx_parse_time(&value[n], 1);
|
|
50
|
532
|
|
376
|
533 if (hcf->expires_time == NGX_ERROR) {
|
|
50
|
534 return "invalid value";
|
|
|
535 }
|
|
126
|
536
|
|
376
|
537 if (hcf->expires_time == NGX_PARSE_LARGE_TIME) {
|
|
50
|
538 return "value must be less than 68 years";
|
|
|
539 }
|
|
|
540
|
|
|
541 if (minus) {
|
|
376
|
542 hcf->expires_time = - hcf->expires_time;
|
|
50
|
543 }
|
|
|
544
|
|
|
545 return NGX_CONF_OK;
|
|
|
546 }
|
|
122
|
547
|
|
|
548
|
|
|
549 static char *
|
|
|
550 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
551 {
|
|
|
552 ngx_http_headers_conf_t *hcf = conf;
|
|
|
553
|
|
174
|
554 ngx_int_t n;
|
|
|
555 ngx_str_t *value;
|
|
326
|
556 ngx_uint_t i;
|
|
174
|
557 ngx_http_header_val_t *h;
|
|
326
|
558 ngx_http_set_header_t *sh;
|
|
174
|
559 ngx_http_script_compile_t sc;
|
|
122
|
560
|
|
|
561 value = cf->args->elts;
|
|
|
562
|
|
|
563 if (hcf->headers == NULL) {
|
|
174
|
564 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
565 sizeof(ngx_http_header_val_t));
|
|
122
|
566 if (hcf->headers == NULL) {
|
|
|
567 return NGX_CONF_ERROR;
|
|
|
568 }
|
|
|
569 }
|
|
|
570
|
|
|
571 h = ngx_array_push(hcf->headers);
|
|
|
572 if (h == NULL) {
|
|
|
573 return NGX_CONF_ERROR;
|
|
|
574 }
|
|
|
575
|
|
174
|
576 h->value.hash = 1;
|
|
|
577 h->value.key = value[1];
|
|
|
578 h->value.value = value[2];
|
|
326
|
579 h->offset = 0;
|
|
|
580 h->handler = ngx_http_add_header;
|
|
174
|
581 h->lengths = NULL;
|
|
|
582 h->values = NULL;
|
|
|
583
|
|
326
|
584 sh = ngx_http_set_headers;
|
|
|
585 for (i = 0; sh[i].name.len; i++) {
|
|
|
586 if (ngx_strcasecmp(value[1].data, sh[i].name.data) != 0) {
|
|
|
587 continue;
|
|
|
588 }
|
|
|
589
|
|
|
590 h->offset = sh[i].offset;
|
|
|
591 h->handler = sh[i].handler;
|
|
|
592 break;
|
|
|
593 }
|
|
|
594
|
|
174
|
595 n = ngx_http_script_variables_count(&value[2]);
|
|
|
596
|
|
|
597 if (n == 0) {
|
|
|
598 return NGX_CONF_OK;
|
|
|
599 }
|
|
|
600
|
|
|
601 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
|
|
|
602
|
|
|
603 sc.cf = cf;
|
|
|
604 sc.source = &value[2];
|
|
|
605 sc.lengths = &h->lengths;
|
|
|
606 sc.values = &h->values;
|
|
|
607 sc.variables = n;
|
|
|
608 sc.complete_lengths = 1;
|
|
|
609 sc.complete_values = 1;
|
|
|
610
|
|
|
611 if (ngx_http_script_compile(&sc) != NGX_OK) {
|
|
|
612 return NGX_CONF_ERROR;
|
|
|
613 }
|
|
122
|
614
|
|
|
615 return NGX_CONF_OK;
|
|
|
616 }
|
