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50
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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50
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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326
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13 typedef struct ngx_http_header_val_s ngx_http_header_val_t;
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14
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15 typedef ngx_int_t (*ngx_http_set_header_pt)(ngx_http_request_t *r,
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16 ngx_http_header_val_t *hv, ngx_str_t *value);
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174
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17
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18
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19 typedef struct {
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464
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20 ngx_str_t name;
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21 ngx_uint_t offset;
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22 ngx_http_set_header_pt handler;
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326
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23 } ngx_http_set_header_t;
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24
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25
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26 struct ngx_http_header_val_s {
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464
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27 ngx_http_complex_value_t value;
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28 ngx_str_t key;
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29 ngx_http_set_header_pt handler;
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30 ngx_uint_t offset;
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326
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31 };
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32
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33
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668
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34 typedef enum {
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35 NGX_HTTP_EXPIRES_OFF,
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36 NGX_HTTP_EXPIRES_EPOCH,
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37 NGX_HTTP_EXPIRES_MAX,
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38 NGX_HTTP_EXPIRES_ACCESS,
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39 NGX_HTTP_EXPIRES_MODIFIED,
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40 NGX_HTTP_EXPIRES_DAILY,
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41 NGX_HTTP_EXPIRES_UNSET
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42 } ngx_http_expires_t;
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376
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43
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44
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326
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45 typedef struct {
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668
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46 ngx_http_expires_t expires;
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376
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47 time_t expires_time;
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326
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48 ngx_array_t *headers;
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50
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49 } ngx_http_headers_conf_t;
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50
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51
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326
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52 static ngx_int_t ngx_http_set_expires(ngx_http_request_t *r,
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53 ngx_http_headers_conf_t *conf);
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54 static ngx_int_t ngx_http_add_cache_control(ngx_http_request_t *r,
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55 ngx_http_header_val_t *hv, ngx_str_t *value);
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668
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56 static ngx_int_t ngx_http_add_header(ngx_http_request_t *r,
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57 ngx_http_header_val_t *hv, ngx_str_t *value);
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326
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58 static ngx_int_t ngx_http_set_last_modified(ngx_http_request_t *r,
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59 ngx_http_header_val_t *hv, ngx_str_t *value);
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60
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50
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61 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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62 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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63 void *parent, void *child);
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230
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64 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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50
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65 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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66 void *conf);
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122
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67 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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68 void *conf);
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69
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70
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326
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71 static ngx_http_set_header_t ngx_http_set_headers[] = {
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72
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73 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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74
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75 { ngx_string("Last-Modified"),
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76 offsetof(ngx_http_headers_out_t, last_modified),
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77 ngx_http_set_last_modified },
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78
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79 { ngx_null_string, 0, NULL }
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80 };
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81
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82
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83 static ngx_command_t ngx_http_headers_filter_commands[] = {
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84
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85 { ngx_string("expires"),
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122
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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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376
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87 |NGX_CONF_TAKE12,
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88 ngx_http_headers_expires,
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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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122
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93 { ngx_string("add_header"),
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94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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95 |NGX_CONF_TAKE2,
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96 ngx_http_headers_add,
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97 NGX_HTTP_LOC_CONF_OFFSET,
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98 0,
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99 NULL},
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100
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101 ngx_null_command
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102 };
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103
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104
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105 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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106 NULL, /* preconfiguration */
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230
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107 ngx_http_headers_filter_init, /* postconfiguration */
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108
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109 NULL, /* create main configuration */
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110 NULL, /* init main configuration */
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111
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112 NULL, /* create server configuration */
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113 NULL, /* merge server configuration */
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114
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115 ngx_http_headers_create_conf, /* create location configuration */
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116 ngx_http_headers_merge_conf /* merge location configuration */
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117 };
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118
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119
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120 ngx_module_t ngx_http_headers_filter_module = {
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58
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121 NGX_MODULE_V1,
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122 &ngx_http_headers_filter_module_ctx, /* module context */
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123 ngx_http_headers_filter_commands, /* module directives */
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124 NGX_HTTP_MODULE, /* module type */
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90
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125 NULL, /* init master */
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230
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126 NULL, /* init module */
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90
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127 NULL, /* init process */
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128 NULL, /* init thread */
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129 NULL, /* exit thread */
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130 NULL, /* exit process */
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131 NULL, /* exit master */
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132 NGX_MODULE_V1_PADDING
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133 };
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134
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135
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136 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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137
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138
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139 static ngx_int_t
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140 ngx_http_headers_filter(ngx_http_request_t *r)
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141 {
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326
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142 ngx_str_t value;
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58
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143 ngx_uint_t i;
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174
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144 ngx_http_header_val_t *h;
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145 ngx_http_headers_conf_t *conf;
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146
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326
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147 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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148
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149 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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150 || r != r->main
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212
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151 || (r->headers_out.status != NGX_HTTP_OK
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152 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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650
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153 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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212
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154 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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155 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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664
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156 && r->headers_out.status != NGX_HTTP_SEE_OTHER
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157 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED
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158 && r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT))
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92
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159 {
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160 return ngx_http_next_header_filter(r);
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161 }
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162
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163 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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164 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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165 return NGX_ERROR;
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166 }
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167 }
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58
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168
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326
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169 if (conf->headers) {
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170 h = conf->headers->elts;
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171 for (i = 0; i < conf->headers->nelts; i++) {
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172
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464
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173 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
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174 return NGX_ERROR;
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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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570
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207 ngx_str_set(&expires->key, "Expires");
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326
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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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570
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235 ngx_str_set(&cc->key, "Cache-Control");
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122
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236 *ccp = cc;
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326
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237
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238 } else {
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239 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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240 ccp[i]->hash = 0;
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241 }
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242
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243 cc = ccp[0];
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244 }
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245
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246 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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247 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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570
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248 ngx_str_set(&cc->value, "no-cache");
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326
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249 return NGX_OK;
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250 }
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251
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252 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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253 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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254 /* 10 years */
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570
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255 ngx_str_set(&cc->value, "max-age=315360000");
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326
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256 return NGX_OK;
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257 }
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258
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382
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259 expires->value.data = ngx_pnalloc(r->pool, len);
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326
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260 if (expires->value.data == NULL) {
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261 return NGX_ERROR;
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262 }
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263
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646
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264 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) {
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326
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265 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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266 ngx_cached_http_time.len + 1);
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570
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267 ngx_str_set(&cc->value, "max-age=0");
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326
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268 return NGX_OK;
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122
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269 }
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270
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394
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271 now = ngx_time();
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272
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646
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273 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) {
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274 expires_time = ngx_next_time(conf->expires_time);
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275 max_age = expires_time - now;
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276
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277 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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278 || r->headers_out.last_modified_time == -1)
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376
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279 {
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394
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280 expires_time = now + conf->expires_time;
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281 max_age = conf->expires_time;
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282
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376
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283 } else {
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394
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284 expires_time = r->headers_out.last_modified_time + conf->expires_time;
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285 max_age = expires_time - now;
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376
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286 }
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287
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394
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288 ngx_http_time(expires->value.data, expires_time);
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376
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289
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560
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290 if (conf->expires_time < 0 || max_age < 0) {
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570
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291 ngx_str_set(&cc->value, "no-cache");
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326
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292 return NGX_OK;
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293 }
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122
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294
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382
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295 cc->value.data = ngx_pnalloc(r->pool,
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296 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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326
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297 if (cc->value.data == NULL) {
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298 return NGX_ERROR;
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299 }
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300
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394
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301 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
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326
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302 - cc->value.data;
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303
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304 return NGX_OK;
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305 }
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306
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307
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308 static ngx_int_t
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309 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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310 ngx_str_t *value)
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311 {
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312 ngx_table_elt_t *h;
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174
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313
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430
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314 if (value->len) {
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315 h = ngx_list_push(&r->headers_out.headers);
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316 if (h == NULL) {
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317 return NGX_ERROR;
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318 }
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319
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668
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320 h->hash = 1;
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464
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321 h->key = hv->key;
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430
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322 h->value = *value;
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326
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323 }
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324
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325 return NGX_OK;
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326 }
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327
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174
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328
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326
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329 static ngx_int_t
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330 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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331 ngx_str_t *value)
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332 {
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333 ngx_table_elt_t *cc, **ccp;
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334
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335 ccp = r->headers_out.cache_control.elts;
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336
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337 if (ccp == NULL) {
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338
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339 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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340 1, sizeof(ngx_table_elt_t *))
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341 != NGX_OK)
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342 {
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343 return NGX_ERROR;
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122
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344 }
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345 }
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346
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326
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347 ccp = ngx_array_push(&r->headers_out.cache_control);
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348 if (ccp == NULL) {
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349 return NGX_ERROR;
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350 }
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351
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352 cc = ngx_list_push(&r->headers_out.headers);
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353 if (cc == NULL) {
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354 return NGX_ERROR;
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355 }
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356
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357 cc->hash = 1;
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570
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358 ngx_str_set(&cc->key, "Cache-Control");
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326
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359 cc->value = *value;
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360
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361 *ccp = cc;
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362
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363 return NGX_OK;
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364 }
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365
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366
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367 static ngx_int_t
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368 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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369 ngx_str_t *value)
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370 {
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371 ngx_table_elt_t *h, **old;
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372
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668
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373 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
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326
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374
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348
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375 r->headers_out.last_modified_time = -1;
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376
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668
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377 if (*old == NULL) {
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348
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378
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379 if (value->len == 0) {
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380 return NGX_OK;
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381 }
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382
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326
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383 h = ngx_list_push(&r->headers_out.headers);
|
|
|
384 if (h == NULL) {
|
|
|
385 return NGX_ERROR;
|
|
|
386 }
|
|
|
387
|
|
668
|
388 *old = h;
|
|
|
389
|
|
326
|
390 } else {
|
|
|
391 h = *old;
|
|
348
|
392
|
|
|
393 if (value->len == 0) {
|
|
|
394 h->hash = 0;
|
|
|
395 return NGX_OK;
|
|
|
396 }
|
|
326
|
397 }
|
|
|
398
|
|
668
|
399 h->hash = 1;
|
|
464
|
400 h->key = hv->key;
|
|
326
|
401 h->value = *value;
|
|
|
402
|
|
|
403 return NGX_OK;
|
|
50
|
404 }
|
|
|
405
|
|
|
406
|
|
|
407 static void *
|
|
|
408 ngx_http_headers_create_conf(ngx_conf_t *cf)
|
|
126
|
409 {
|
|
50
|
410 ngx_http_headers_conf_t *conf;
|
|
|
411
|
|
122
|
412 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
|
|
50
|
413 if (conf == NULL) {
|
|
496
|
414 return NULL;
|
|
50
|
415 }
|
|
|
416
|
|
122
|
417 /*
|
|
|
418 * set by ngx_pcalloc():
|
|
|
419 *
|
|
|
420 * conf->headers = NULL;
|
|
376
|
421 * conf->expires_time = 0;
|
|
122
|
422 */
|
|
|
423
|
|
668
|
424 conf->expires = NGX_HTTP_EXPIRES_UNSET;
|
|
50
|
425
|
|
|
426 return conf;
|
|
|
427 }
|
|
|
428
|
|
|
429
|
|
|
430 static char *
|
|
|
431 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
432 {
|
|
|
433 ngx_http_headers_conf_t *prev = parent;
|
|
|
434 ngx_http_headers_conf_t *conf = child;
|
|
|
435
|
|
668
|
436 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
|
|
376
|
437 conf->expires = prev->expires;
|
|
|
438 conf->expires_time = prev->expires_time;
|
|
|
439
|
|
668
|
440 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
|
|
376
|
441 conf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
442 }
|
|
122
|
443 }
|
|
|
444
|
|
|
445 if (conf->headers == NULL) {
|
|
|
446 conf->headers = prev->headers;
|
|
|
447 }
|
|
|
448
|
|
50
|
449 return NGX_CONF_OK;
|
|
|
450 }
|
|
|
451
|
|
|
452
|
|
230
|
453 static ngx_int_t
|
|
|
454 ngx_http_headers_filter_init(ngx_conf_t *cf)
|
|
|
455 {
|
|
|
456 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
457 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
|
458
|
|
|
459 return NGX_OK;
|
|
|
460 }
|
|
|
461
|
|
|
462
|
|
50
|
463 static char *
|
|
|
464 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
465 {
|
|
|
466 ngx_http_headers_conf_t *hcf = conf;
|
|
|
467
|
|
376
|
468 ngx_uint_t minus, n;
|
|
50
|
469 ngx_str_t *value;
|
|
|
470
|
|
668
|
471 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
|
|
50
|
472 return "is duplicate";
|
|
|
473 }
|
|
|
474
|
|
|
475 value = cf->args->elts;
|
|
|
476
|
|
376
|
477 if (cf->args->nelts == 2) {
|
|
|
478
|
|
|
479 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
|
480 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
|
481 return NGX_CONF_OK;
|
|
|
482 }
|
|
|
483
|
|
|
484 if (ngx_strcmp(value[1].data, "max") == 0) {
|
|
|
485 hcf->expires = NGX_HTTP_EXPIRES_MAX;
|
|
|
486 return NGX_CONF_OK;
|
|
|
487 }
|
|
50
|
488
|
|
376
|
489 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
|
490 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
491 return NGX_CONF_OK;
|
|
|
492 }
|
|
|
493
|
|
|
494 hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
|
|
|
495
|
|
|
496 n = 1;
|
|
|
497
|
|
|
498 } else { /* cf->args->nelts == 3 */
|
|
|
499
|
|
|
500 if (ngx_strcmp(value[1].data, "modified") != 0) {
|
|
|
501 return "invalid value";
|
|
|
502 }
|
|
|
503
|
|
|
504 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
|
|
|
505
|
|
|
506 n = 2;
|
|
238
|
507 }
|
|
|
508
|
|
394
|
509 if (value[n].data[0] == '@') {
|
|
|
510 value[n].data++;
|
|
|
511 value[n].len--;
|
|
|
512 minus = 0;
|
|
|
513
|
|
|
514 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) {
|
|
640
|
515 return "daily time cannot be used with \"modified\" parameter";
|
|
394
|
516 }
|
|
|
517
|
|
|
518 hcf->expires = NGX_HTTP_EXPIRES_DAILY;
|
|
|
519
|
|
|
520 } else if (value[n].data[0] == '+') {
|
|
376
|
521 value[n].data++;
|
|
|
522 value[n].len--;
|
|
50
|
523 minus = 0;
|
|
|
524
|
|
376
|
525 } else if (value[n].data[0] == '-') {
|
|
|
526 value[n].data++;
|
|
|
527 value[n].len--;
|
|
50
|
528 minus = 1;
|
|
|
529
|
|
|
530 } else {
|
|
|
531 minus = 0;
|
|
|
532 }
|
|
|
533
|
|
376
|
534 hcf->expires_time = ngx_parse_time(&value[n], 1);
|
|
50
|
535
|
|
662
|
536 if (hcf->expires_time == (time_t) NGX_ERROR) {
|
|
50
|
537 return "invalid value";
|
|
|
538 }
|
|
126
|
539
|
|
394
|
540 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY
|
|
|
541 && hcf->expires_time > 24 * 60 * 60)
|
|
|
542 {
|
|
|
543 return "daily time value must be less than 24 hours";
|
|
|
544 }
|
|
|
545
|
|
50
|
546 if (minus) {
|
|
376
|
547 hcf->expires_time = - hcf->expires_time;
|
|
50
|
548 }
|
|
|
549
|
|
|
550 return NGX_CONF_OK;
|
|
|
551 }
|
|
122
|
552
|
|
|
553
|
|
|
554 static char *
|
|
|
555 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
556 {
|
|
|
557 ngx_http_headers_conf_t *hcf = conf;
|
|
|
558
|
|
464
|
559 ngx_str_t *value;
|
|
|
560 ngx_uint_t i;
|
|
|
561 ngx_http_header_val_t *hv;
|
|
|
562 ngx_http_set_header_t *set;
|
|
|
563 ngx_http_compile_complex_value_t ccv;
|
|
122
|
564
|
|
|
565 value = cf->args->elts;
|
|
|
566
|
|
|
567 if (hcf->headers == NULL) {
|
|
174
|
568 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
569 sizeof(ngx_http_header_val_t));
|
|
122
|
570 if (hcf->headers == NULL) {
|
|
|
571 return NGX_CONF_ERROR;
|
|
|
572 }
|
|
|
573 }
|
|
|
574
|
|
464
|
575 hv = ngx_array_push(hcf->headers);
|
|
|
576 if (hv == NULL) {
|
|
122
|
577 return NGX_CONF_ERROR;
|
|
|
578 }
|
|
|
579
|
|
464
|
580 hv->key = value[1];
|
|
|
581 hv->handler = ngx_http_add_header;
|
|
|
582 hv->offset = 0;
|
|
174
|
583
|
|
464
|
584 set = ngx_http_set_headers;
|
|
|
585 for (i = 0; set[i].name.len; i++) {
|
|
|
586 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) {
|
|
326
|
587 continue;
|
|
|
588 }
|
|
|
589
|
|
464
|
590 hv->offset = set[i].offset;
|
|
|
591 hv->handler = set[i].handler;
|
|
|
592
|
|
326
|
593 break;
|
|
|
594 }
|
|
|
595
|
|
466
|
596 if (value[2].len == 0) {
|
|
|
597 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t));
|
|
|
598 return NGX_CONF_OK;
|
|
|
599 }
|
|
|
600
|
|
464
|
601 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
|
174
|
602
|
|
464
|
603 ccv.cf = cf;
|
|
|
604 ccv.value = &value[2];
|
|
|
605 ccv.complex_value = &hv->value;
|
|
174
|
606
|
|
464
|
607 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
|
174
|
608 return NGX_CONF_ERROR;
|
|
|
609 }
|
|
122
|
610
|
|
|
611 return NGX_CONF_OK;
|
|
|
612 }
|
