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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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680
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60 static ngx_int_t ngx_http_set_response_header(ngx_http_request_t *r,
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61 ngx_http_header_val_t *hv, ngx_str_t *value);
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326
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62
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50
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63 static void *ngx_http_headers_create_conf(ngx_conf_t *cf);
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64 static char *ngx_http_headers_merge_conf(ngx_conf_t *cf,
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122
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65 void *parent, void *child);
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230
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66 static ngx_int_t ngx_http_headers_filter_init(ngx_conf_t *cf);
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50
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67 static char *ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd,
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68 void *conf);
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122
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69 static char *ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd,
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70 void *conf);
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71
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72
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326
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73 static ngx_http_set_header_t ngx_http_set_headers[] = {
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74
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75 { ngx_string("Cache-Control"), 0, ngx_http_add_cache_control },
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76
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680
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77 { ngx_string("Last-Modified"), 0, ngx_http_set_last_modified },
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78
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79 { ngx_string("ETag"),
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80 offsetof(ngx_http_headers_out_t, etag),
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81 ngx_http_set_response_header },
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326
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82
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83 { ngx_null_string, 0, NULL }
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84 };
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85
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86
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87 static ngx_command_t ngx_http_headers_filter_commands[] = {
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88
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89 { ngx_string("expires"),
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122
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90 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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376
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91 |NGX_CONF_TAKE12,
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92 ngx_http_headers_expires,
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93 NGX_HTTP_LOC_CONF_OFFSET,
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94 0,
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95 NULL},
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96
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122
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97 { ngx_string("add_header"),
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98 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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99 |NGX_CONF_TAKE2,
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100 ngx_http_headers_add,
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101 NGX_HTTP_LOC_CONF_OFFSET,
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102 0,
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103 NULL},
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104
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105 ngx_null_command
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106 };
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107
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108
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109 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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110 NULL, /* preconfiguration */
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230
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111 ngx_http_headers_filter_init, /* postconfiguration */
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112
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113 NULL, /* create main configuration */
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114 NULL, /* init main configuration */
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115
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116 NULL, /* create server configuration */
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117 NULL, /* merge server configuration */
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118
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119 ngx_http_headers_create_conf, /* create location configuration */
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120 ngx_http_headers_merge_conf /* merge location configuration */
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121 };
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122
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123
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124 ngx_module_t ngx_http_headers_filter_module = {
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58
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125 NGX_MODULE_V1,
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126 &ngx_http_headers_filter_module_ctx, /* module context */
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127 ngx_http_headers_filter_commands, /* module directives */
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128 NGX_HTTP_MODULE, /* module type */
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90
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129 NULL, /* init master */
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230
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130 NULL, /* init module */
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90
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131 NULL, /* init process */
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132 NULL, /* init thread */
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133 NULL, /* exit thread */
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134 NULL, /* exit process */
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135 NULL, /* exit master */
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136 NGX_MODULE_V1_PADDING
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137 };
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138
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139
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140 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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141
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142
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143 static ngx_int_t
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144 ngx_http_headers_filter(ngx_http_request_t *r)
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145 {
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326
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146 ngx_str_t value;
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58
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147 ngx_uint_t i;
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174
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148 ngx_http_header_val_t *h;
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149 ngx_http_headers_conf_t *conf;
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150
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326
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151 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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152
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153 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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154 || r != r->main
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212
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155 || (r->headers_out.status != NGX_HTTP_OK
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156 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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650
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157 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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212
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158 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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159 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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664
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160 && r->headers_out.status != NGX_HTTP_SEE_OTHER
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161 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED
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162 && r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT))
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92
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163 {
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164 return ngx_http_next_header_filter(r);
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165 }
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166
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167 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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168 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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169 return NGX_ERROR;
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170 }
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171 }
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58
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172
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326
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173 if (conf->headers) {
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174 h = conf->headers->elts;
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175 for (i = 0; i < conf->headers->nelts; i++) {
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176
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464
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177 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
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178 return NGX_ERROR;
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58
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179 }
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180
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326
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181 if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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182 return NGX_ERROR;
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183 }
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184 }
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185 }
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186
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326
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187 return ngx_http_next_header_filter(r);
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188 }
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189
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122
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190
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326
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191 static ngx_int_t
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192 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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193 {
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194 size_t len;
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394
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195 time_t now, expires_time, max_age;
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326
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196 ngx_uint_t i;
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197 ngx_table_elt_t *expires, *cc, **ccp;
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122
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198
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326
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199 expires = r->headers_out.expires;
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200
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201 if (expires == NULL) {
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202
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203 expires = ngx_list_push(&r->headers_out.headers);
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204 if (expires == NULL) {
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205 return NGX_ERROR;
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206 }
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122
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207
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326
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208 r->headers_out.expires = expires;
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209
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210 expires->hash = 1;
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570
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211 ngx_str_set(&expires->key, "Expires");
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326
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212 }
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213
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214 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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215 expires->value.len = len - 1;
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216
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217 ccp = r->headers_out.cache_control.elts;
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218
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219 if (ccp == NULL) {
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220
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221 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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222 1, sizeof(ngx_table_elt_t *))
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223 != NGX_OK)
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224 {
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225 return NGX_ERROR;
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122
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226 }
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227
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228 ccp = ngx_array_push(&r->headers_out.cache_control);
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229 if (ccp == NULL) {
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230 return NGX_ERROR;
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231 }
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232
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233 cc = ngx_list_push(&r->headers_out.headers);
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234 if (cc == NULL) {
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235 return NGX_ERROR;
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236 }
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237
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238 cc->hash = 1;
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570
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239 ngx_str_set(&cc->key, "Cache-Control");
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122
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240 *ccp = cc;
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326
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241
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242 } else {
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243 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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244 ccp[i]->hash = 0;
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245 }
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246
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247 cc = ccp[0];
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248 }
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249
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250 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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251 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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570
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252 ngx_str_set(&cc->value, "no-cache");
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326
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253 return NGX_OK;
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254 }
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255
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256 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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257 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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258 /* 10 years */
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570
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259 ngx_str_set(&cc->value, "max-age=315360000");
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326
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260 return NGX_OK;
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261 }
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262
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382
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263 expires->value.data = ngx_pnalloc(r->pool, len);
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326
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264 if (expires->value.data == NULL) {
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265 return NGX_ERROR;
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266 }
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267
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646
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268 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) {
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326
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269 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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270 ngx_cached_http_time.len + 1);
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570
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271 ngx_str_set(&cc->value, "max-age=0");
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326
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272 return NGX_OK;
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122
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273 }
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274
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394
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275 now = ngx_time();
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276
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646
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277 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) {
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278 expires_time = ngx_next_time(conf->expires_time);
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279 max_age = expires_time - now;
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280
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281 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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282 || r->headers_out.last_modified_time == -1)
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376
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283 {
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394
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284 expires_time = now + conf->expires_time;
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285 max_age = conf->expires_time;
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286
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376
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287 } else {
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394
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288 expires_time = r->headers_out.last_modified_time + conf->expires_time;
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289 max_age = expires_time - now;
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376
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290 }
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291
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394
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292 ngx_http_time(expires->value.data, expires_time);
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376
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293
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560
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294 if (conf->expires_time < 0 || max_age < 0) {
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570
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295 ngx_str_set(&cc->value, "no-cache");
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326
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296 return NGX_OK;
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297 }
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122
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298
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382
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299 cc->value.data = ngx_pnalloc(r->pool,
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300 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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326
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301 if (cc->value.data == NULL) {
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302 return NGX_ERROR;
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303 }
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304
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394
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305 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
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326
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306 - cc->value.data;
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307
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308 return NGX_OK;
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309 }
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310
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311
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312 static ngx_int_t
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313 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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314 ngx_str_t *value)
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315 {
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316 ngx_table_elt_t *h;
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174
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317
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430
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318 if (value->len) {
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319 h = ngx_list_push(&r->headers_out.headers);
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320 if (h == NULL) {
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321 return NGX_ERROR;
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322 }
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323
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668
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324 h->hash = 1;
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464
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325 h->key = hv->key;
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430
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326 h->value = *value;
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326
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327 }
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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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570
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362 ngx_str_set(&cc->key, "Cache-Control");
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326
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363 cc->value = *value;
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364
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365 *ccp = cc;
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366
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367 return NGX_OK;
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368 }
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369
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370
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371 static ngx_int_t
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372 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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373 ngx_str_t *value)
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374 {
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680
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375 ngx_table_elt_t *h;
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376
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377 ngx_http_clear_last_modified(r);
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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
|
|
|
383 r->headers_out.last_modified_time = ngx_http_parse_time(value->data,
|
|
|
384 value->len);
|
|
|
385
|
|
|
386 h = ngx_list_push(&r->headers_out.headers);
|
|
|
387 if (h == NULL) {
|
|
|
388 return NGX_ERROR;
|
|
|
389 }
|
|
|
390
|
|
|
391 r->headers_out.last_modified = h;
|
|
|
392
|
|
|
393 h->hash = 1;
|
|
|
394 h->key = hv->key;
|
|
|
395 h->value = *value;
|
|
|
396
|
|
|
397 return NGX_OK;
|
|
|
398 }
|
|
|
399
|
|
|
400
|
|
|
401 static ngx_int_t
|
|
|
402 ngx_http_set_response_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
|
|
|
403 ngx_str_t *value)
|
|
|
404 {
|
|
326
|
405 ngx_table_elt_t *h, **old;
|
|
|
406
|
|
668
|
407 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
|
|
326
|
408
|
|
680
|
409 if (*old) {
|
|
|
410 (*old)->hash = 0;
|
|
|
411 *old = NULL;
|
|
|
412 }
|
|
348
|
413
|
|
680
|
414 if (value->len == 0) {
|
|
|
415 return NGX_OK;
|
|
|
416 }
|
|
668
|
417
|
|
680
|
418 h = ngx_list_push(&r->headers_out.headers);
|
|
|
419 if (h == NULL) {
|
|
|
420 return NGX_ERROR;
|
|
|
421 }
|
|
348
|
422
|
|
680
|
423 *old = h;
|
|
326
|
424
|
|
668
|
425 h->hash = 1;
|
|
464
|
426 h->key = hv->key;
|
|
326
|
427 h->value = *value;
|
|
|
428
|
|
|
429 return NGX_OK;
|
|
50
|
430 }
|
|
|
431
|
|
|
432
|
|
|
433 static void *
|
|
|
434 ngx_http_headers_create_conf(ngx_conf_t *cf)
|
|
126
|
435 {
|
|
50
|
436 ngx_http_headers_conf_t *conf;
|
|
|
437
|
|
122
|
438 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
|
|
50
|
439 if (conf == NULL) {
|
|
496
|
440 return NULL;
|
|
50
|
441 }
|
|
|
442
|
|
122
|
443 /*
|
|
|
444 * set by ngx_pcalloc():
|
|
|
445 *
|
|
|
446 * conf->headers = NULL;
|
|
376
|
447 * conf->expires_time = 0;
|
|
122
|
448 */
|
|
|
449
|
|
668
|
450 conf->expires = NGX_HTTP_EXPIRES_UNSET;
|
|
50
|
451
|
|
|
452 return conf;
|
|
|
453 }
|
|
|
454
|
|
|
455
|
|
|
456 static char *
|
|
|
457 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
458 {
|
|
|
459 ngx_http_headers_conf_t *prev = parent;
|
|
|
460 ngx_http_headers_conf_t *conf = child;
|
|
|
461
|
|
668
|
462 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
|
|
376
|
463 conf->expires = prev->expires;
|
|
|
464 conf->expires_time = prev->expires_time;
|
|
|
465
|
|
668
|
466 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
|
|
376
|
467 conf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
468 }
|
|
122
|
469 }
|
|
|
470
|
|
|
471 if (conf->headers == NULL) {
|
|
|
472 conf->headers = prev->headers;
|
|
|
473 }
|
|
|
474
|
|
50
|
475 return NGX_CONF_OK;
|
|
|
476 }
|
|
|
477
|
|
|
478
|
|
230
|
479 static ngx_int_t
|
|
|
480 ngx_http_headers_filter_init(ngx_conf_t *cf)
|
|
|
481 {
|
|
|
482 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
483 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
|
484
|
|
|
485 return NGX_OK;
|
|
|
486 }
|
|
|
487
|
|
|
488
|
|
50
|
489 static char *
|
|
|
490 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
491 {
|
|
|
492 ngx_http_headers_conf_t *hcf = conf;
|
|
|
493
|
|
376
|
494 ngx_uint_t minus, n;
|
|
50
|
495 ngx_str_t *value;
|
|
|
496
|
|
668
|
497 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
|
|
50
|
498 return "is duplicate";
|
|
|
499 }
|
|
|
500
|
|
|
501 value = cf->args->elts;
|
|
|
502
|
|
376
|
503 if (cf->args->nelts == 2) {
|
|
|
504
|
|
|
505 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
|
506 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
|
507 return NGX_CONF_OK;
|
|
|
508 }
|
|
|
509
|
|
|
510 if (ngx_strcmp(value[1].data, "max") == 0) {
|
|
|
511 hcf->expires = NGX_HTTP_EXPIRES_MAX;
|
|
|
512 return NGX_CONF_OK;
|
|
|
513 }
|
|
50
|
514
|
|
376
|
515 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
|
516 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
517 return NGX_CONF_OK;
|
|
|
518 }
|
|
|
519
|
|
|
520 hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
|
|
|
521
|
|
|
522 n = 1;
|
|
|
523
|
|
|
524 } else { /* cf->args->nelts == 3 */
|
|
|
525
|
|
|
526 if (ngx_strcmp(value[1].data, "modified") != 0) {
|
|
|
527 return "invalid value";
|
|
|
528 }
|
|
|
529
|
|
|
530 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
|
|
|
531
|
|
|
532 n = 2;
|
|
238
|
533 }
|
|
|
534
|
|
394
|
535 if (value[n].data[0] == '@') {
|
|
|
536 value[n].data++;
|
|
|
537 value[n].len--;
|
|
|
538 minus = 0;
|
|
|
539
|
|
|
540 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) {
|
|
640
|
541 return "daily time cannot be used with \"modified\" parameter";
|
|
394
|
542 }
|
|
|
543
|
|
|
544 hcf->expires = NGX_HTTP_EXPIRES_DAILY;
|
|
|
545
|
|
|
546 } else if (value[n].data[0] == '+') {
|
|
376
|
547 value[n].data++;
|
|
|
548 value[n].len--;
|
|
50
|
549 minus = 0;
|
|
|
550
|
|
376
|
551 } else if (value[n].data[0] == '-') {
|
|
|
552 value[n].data++;
|
|
|
553 value[n].len--;
|
|
50
|
554 minus = 1;
|
|
|
555
|
|
|
556 } else {
|
|
|
557 minus = 0;
|
|
|
558 }
|
|
|
559
|
|
376
|
560 hcf->expires_time = ngx_parse_time(&value[n], 1);
|
|
50
|
561
|
|
662
|
562 if (hcf->expires_time == (time_t) NGX_ERROR) {
|
|
50
|
563 return "invalid value";
|
|
|
564 }
|
|
126
|
565
|
|
394
|
566 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY
|
|
|
567 && hcf->expires_time > 24 * 60 * 60)
|
|
|
568 {
|
|
|
569 return "daily time value must be less than 24 hours";
|
|
|
570 }
|
|
|
571
|
|
50
|
572 if (minus) {
|
|
376
|
573 hcf->expires_time = - hcf->expires_time;
|
|
50
|
574 }
|
|
|
575
|
|
|
576 return NGX_CONF_OK;
|
|
|
577 }
|
|
122
|
578
|
|
|
579
|
|
|
580 static char *
|
|
|
581 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
582 {
|
|
|
583 ngx_http_headers_conf_t *hcf = conf;
|
|
|
584
|
|
464
|
585 ngx_str_t *value;
|
|
|
586 ngx_uint_t i;
|
|
|
587 ngx_http_header_val_t *hv;
|
|
|
588 ngx_http_set_header_t *set;
|
|
|
589 ngx_http_compile_complex_value_t ccv;
|
|
122
|
590
|
|
|
591 value = cf->args->elts;
|
|
|
592
|
|
|
593 if (hcf->headers == NULL) {
|
|
174
|
594 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
595 sizeof(ngx_http_header_val_t));
|
|
122
|
596 if (hcf->headers == NULL) {
|
|
|
597 return NGX_CONF_ERROR;
|
|
|
598 }
|
|
|
599 }
|
|
|
600
|
|
464
|
601 hv = ngx_array_push(hcf->headers);
|
|
|
602 if (hv == NULL) {
|
|
122
|
603 return NGX_CONF_ERROR;
|
|
|
604 }
|
|
|
605
|
|
464
|
606 hv->key = value[1];
|
|
|
607 hv->handler = ngx_http_add_header;
|
|
|
608 hv->offset = 0;
|
|
174
|
609
|
|
464
|
610 set = ngx_http_set_headers;
|
|
|
611 for (i = 0; set[i].name.len; i++) {
|
|
|
612 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) {
|
|
326
|
613 continue;
|
|
|
614 }
|
|
|
615
|
|
464
|
616 hv->offset = set[i].offset;
|
|
|
617 hv->handler = set[i].handler;
|
|
|
618
|
|
326
|
619 break;
|
|
|
620 }
|
|
|
621
|
|
466
|
622 if (value[2].len == 0) {
|
|
|
623 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t));
|
|
|
624 return NGX_CONF_OK;
|
|
|
625 }
|
|
|
626
|
|
464
|
627 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
|
174
|
628
|
|
464
|
629 ccv.cf = cf;
|
|
|
630 ccv.value = &value[2];
|
|
|
631 ccv.complex_value = &hv->value;
|
|
174
|
632
|
|
464
|
633 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
|
174
|
634 return NGX_CONF_ERROR;
|
|
|
635 }
|
|
122
|
636
|
|
|
637 return NGX_CONF_OK;
|
|
|
638 }
|
