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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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50
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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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694
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77 { ngx_string("Last-Modified"),
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78 offsetof(ngx_http_headers_out_t, last_modified),
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79 ngx_http_set_last_modified },
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680
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80
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81 { ngx_string("ETag"),
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82 offsetof(ngx_http_headers_out_t, etag),
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83 ngx_http_set_response_header },
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326
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84
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85 { ngx_null_string, 0, NULL }
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86 };
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87
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88
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89 static ngx_command_t ngx_http_headers_filter_commands[] = {
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90
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91 { ngx_string("expires"),
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122
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92 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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93 |NGX_CONF_TAKE12,
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94 ngx_http_headers_expires,
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95 NGX_HTTP_LOC_CONF_OFFSET,
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96 0,
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97 NULL},
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98
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122
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99 { ngx_string("add_header"),
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100 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
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101 |NGX_CONF_TAKE2,
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102 ngx_http_headers_add,
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103 NGX_HTTP_LOC_CONF_OFFSET,
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104 0,
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105 NULL},
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106
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50
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107 ngx_null_command
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108 };
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109
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110
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111 static ngx_http_module_t ngx_http_headers_filter_module_ctx = {
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58
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112 NULL, /* preconfiguration */
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230
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113 ngx_http_headers_filter_init, /* postconfiguration */
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114
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115 NULL, /* create main configuration */
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116 NULL, /* init main configuration */
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117
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118 NULL, /* create server configuration */
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119 NULL, /* merge server configuration */
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120
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121 ngx_http_headers_create_conf, /* create location configuration */
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122 ngx_http_headers_merge_conf /* merge location configuration */
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123 };
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124
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125
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126 ngx_module_t ngx_http_headers_filter_module = {
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58
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127 NGX_MODULE_V1,
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128 &ngx_http_headers_filter_module_ctx, /* module context */
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129 ngx_http_headers_filter_commands, /* module directives */
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130 NGX_HTTP_MODULE, /* module type */
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90
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131 NULL, /* init master */
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230
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132 NULL, /* init module */
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90
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133 NULL, /* init process */
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134 NULL, /* init thread */
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135 NULL, /* exit thread */
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136 NULL, /* exit process */
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137 NULL, /* exit master */
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138 NGX_MODULE_V1_PADDING
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139 };
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140
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141
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142 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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143
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144
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145 static ngx_int_t
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146 ngx_http_headers_filter(ngx_http_request_t *r)
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147 {
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326
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148 ngx_str_t value;
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58
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149 ngx_uint_t i;
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174
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150 ngx_http_header_val_t *h;
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50
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151 ngx_http_headers_conf_t *conf;
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152
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326
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153 conf = ngx_http_get_module_loc_conf(r, ngx_http_headers_filter_module);
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154
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155 if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
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156 || r != r->main
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212
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157 || (r->headers_out.status != NGX_HTTP_OK
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694
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158 && r->headers_out.status != NGX_HTTP_CREATED
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212
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159 && r->headers_out.status != NGX_HTTP_NO_CONTENT
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650
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160 && r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT
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212
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161 && r->headers_out.status != NGX_HTTP_MOVED_PERMANENTLY
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162 && r->headers_out.status != NGX_HTTP_MOVED_TEMPORARILY
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664
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163 && r->headers_out.status != NGX_HTTP_SEE_OTHER
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164 && r->headers_out.status != NGX_HTTP_NOT_MODIFIED
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165 && r->headers_out.status != NGX_HTTP_TEMPORARY_REDIRECT))
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92
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166 {
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167 return ngx_http_next_header_filter(r);
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168 }
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169
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170 if (conf->expires != NGX_HTTP_EXPIRES_OFF) {
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326
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171 if (ngx_http_set_expires(r, conf) != NGX_OK) {
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172 return NGX_ERROR;
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173 }
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174 }
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58
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175
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326
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176 if (conf->headers) {
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177 h = conf->headers->elts;
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178 for (i = 0; i < conf->headers->nelts; i++) {
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179
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464
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180 if (ngx_http_complex_value(r, &h[i].value, &value) != NGX_OK) {
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181 return NGX_ERROR;
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58
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182 }
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183
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326
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184 if (h[i].handler(r, &h[i], &value) != NGX_OK) {
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185 return NGX_ERROR;
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186 }
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187 }
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188 }
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189
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326
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190 return ngx_http_next_header_filter(r);
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191 }
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192
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122
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193
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326
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194 static ngx_int_t
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195 ngx_http_set_expires(ngx_http_request_t *r, ngx_http_headers_conf_t *conf)
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196 {
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197 size_t len;
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394
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198 time_t now, expires_time, max_age;
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326
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199 ngx_uint_t i;
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200 ngx_table_elt_t *expires, *cc, **ccp;
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122
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201
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326
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202 expires = r->headers_out.expires;
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203
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204 if (expires == NULL) {
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205
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206 expires = ngx_list_push(&r->headers_out.headers);
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207 if (expires == NULL) {
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208 return NGX_ERROR;
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209 }
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122
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210
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326
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211 r->headers_out.expires = expires;
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212
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213 expires->hash = 1;
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570
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214 ngx_str_set(&expires->key, "Expires");
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326
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215 }
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216
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217 len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT");
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218 expires->value.len = len - 1;
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219
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220 ccp = r->headers_out.cache_control.elts;
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221
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222 if (ccp == NULL) {
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223
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224 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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225 1, sizeof(ngx_table_elt_t *))
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226 != NGX_OK)
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227 {
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228 return NGX_ERROR;
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122
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229 }
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230
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231 ccp = ngx_array_push(&r->headers_out.cache_control);
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232 if (ccp == NULL) {
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233 return NGX_ERROR;
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234 }
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235
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236 cc = ngx_list_push(&r->headers_out.headers);
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237 if (cc == NULL) {
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238 return NGX_ERROR;
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239 }
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240
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241 cc->hash = 1;
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570
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242 ngx_str_set(&cc->key, "Cache-Control");
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122
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243 *ccp = cc;
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326
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244
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245 } else {
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246 for (i = 1; i < r->headers_out.cache_control.nelts; i++) {
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247 ccp[i]->hash = 0;
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248 }
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249
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250 cc = ccp[0];
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251 }
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252
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253 if (conf->expires == NGX_HTTP_EXPIRES_EPOCH) {
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254 expires->value.data = (u_char *) "Thu, 01 Jan 1970 00:00:01 GMT";
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570
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255 ngx_str_set(&cc->value, "no-cache");
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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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259 if (conf->expires == NGX_HTTP_EXPIRES_MAX) {
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260 expires->value.data = (u_char *) "Thu, 31 Dec 2037 23:55:55 GMT";
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261 /* 10 years */
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570
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262 ngx_str_set(&cc->value, "max-age=315360000");
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326
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263 return NGX_OK;
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264 }
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265
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382
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266 expires->value.data = ngx_pnalloc(r->pool, len);
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326
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267 if (expires->value.data == NULL) {
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268 return NGX_ERROR;
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269 }
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270
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646
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271 if (conf->expires_time == 0 && conf->expires != NGX_HTTP_EXPIRES_DAILY) {
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326
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272 ngx_memcpy(expires->value.data, ngx_cached_http_time.data,
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273 ngx_cached_http_time.len + 1);
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570
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274 ngx_str_set(&cc->value, "max-age=0");
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326
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275 return NGX_OK;
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122
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276 }
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277
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394
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278 now = ngx_time();
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279
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646
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280 if (conf->expires == NGX_HTTP_EXPIRES_DAILY) {
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281 expires_time = ngx_next_time(conf->expires_time);
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282 max_age = expires_time - now;
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283
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284 } else if (conf->expires == NGX_HTTP_EXPIRES_ACCESS
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285 || r->headers_out.last_modified_time == -1)
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376
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286 {
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394
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287 expires_time = now + conf->expires_time;
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288 max_age = conf->expires_time;
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289
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376
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290 } else {
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394
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291 expires_time = r->headers_out.last_modified_time + conf->expires_time;
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292 max_age = expires_time - now;
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376
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293 }
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294
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394
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295 ngx_http_time(expires->value.data, expires_time);
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376
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296
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560
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297 if (conf->expires_time < 0 || max_age < 0) {
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570
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298 ngx_str_set(&cc->value, "no-cache");
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326
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299 return NGX_OK;
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300 }
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122
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301
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382
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302 cc->value.data = ngx_pnalloc(r->pool,
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303 sizeof("max-age=") + NGX_TIME_T_LEN + 1);
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326
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304 if (cc->value.data == NULL) {
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305 return NGX_ERROR;
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306 }
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307
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394
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308 cc->value.len = ngx_sprintf(cc->value.data, "max-age=%T", max_age)
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326
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309 - cc->value.data;
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310
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311 return NGX_OK;
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312 }
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313
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314
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315 static ngx_int_t
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316 ngx_http_add_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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317 ngx_str_t *value)
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318 {
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319 ngx_table_elt_t *h;
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174
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320
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430
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321 if (value->len) {
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322 h = ngx_list_push(&r->headers_out.headers);
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323 if (h == NULL) {
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324 return NGX_ERROR;
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325 }
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326
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668
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327 h->hash = 1;
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464
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328 h->key = hv->key;
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430
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329 h->value = *value;
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326
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330 }
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331
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332 return NGX_OK;
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333 }
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334
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174
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335
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326
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336 static ngx_int_t
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337 ngx_http_add_cache_control(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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338 ngx_str_t *value)
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339 {
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340 ngx_table_elt_t *cc, **ccp;
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341
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342 ccp = r->headers_out.cache_control.elts;
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343
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344 if (ccp == NULL) {
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345
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346 if (ngx_array_init(&r->headers_out.cache_control, r->pool,
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347 1, sizeof(ngx_table_elt_t *))
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348 != NGX_OK)
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349 {
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350 return NGX_ERROR;
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122
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351 }
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352 }
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353
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326
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354 ccp = ngx_array_push(&r->headers_out.cache_control);
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355 if (ccp == NULL) {
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356 return NGX_ERROR;
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357 }
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358
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359 cc = ngx_list_push(&r->headers_out.headers);
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360 if (cc == NULL) {
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361 return NGX_ERROR;
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362 }
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363
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364 cc->hash = 1;
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570
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365 ngx_str_set(&cc->key, "Cache-Control");
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326
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366 cc->value = *value;
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367
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368 *ccp = cc;
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369
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370 return NGX_OK;
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371 }
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372
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373
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374 static ngx_int_t
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375 ngx_http_set_last_modified(ngx_http_request_t *r, ngx_http_header_val_t *hv,
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376 ngx_str_t *value)
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377 {
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694
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378 if (ngx_http_set_response_header(r, hv, value) != NGX_OK) {
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680
|
379 return NGX_ERROR;
|
|
|
380 }
|
|
|
381
|
|
694
|
382 r->headers_out.last_modified_time =
|
|
|
383 (value->len) ? ngx_http_parse_time(value->data, value->len) : -1;
|
|
680
|
384
|
|
|
385 return NGX_OK;
|
|
|
386 }
|
|
|
387
|
|
|
388
|
|
|
389 static ngx_int_t
|
|
|
390 ngx_http_set_response_header(ngx_http_request_t *r, ngx_http_header_val_t *hv,
|
|
|
391 ngx_str_t *value)
|
|
|
392 {
|
|
326
|
393 ngx_table_elt_t *h, **old;
|
|
|
394
|
|
668
|
395 old = (ngx_table_elt_t **) ((char *) &r->headers_out + hv->offset);
|
|
326
|
396
|
|
694
|
397 if (value->len == 0) {
|
|
|
398 if (*old) {
|
|
|
399 (*old)->hash = 0;
|
|
|
400 *old = NULL;
|
|
|
401 }
|
|
348
|
402
|
|
680
|
403 return NGX_OK;
|
|
|
404 }
|
|
668
|
405
|
|
694
|
406 if (*old) {
|
|
|
407 h = *old;
|
|
|
408
|
|
|
409 } else {
|
|
|
410 h = ngx_list_push(&r->headers_out.headers);
|
|
|
411 if (h == NULL) {
|
|
|
412 return NGX_ERROR;
|
|
|
413 }
|
|
|
414
|
|
|
415 *old = h;
|
|
680
|
416 }
|
|
348
|
417
|
|
668
|
418 h->hash = 1;
|
|
464
|
419 h->key = hv->key;
|
|
326
|
420 h->value = *value;
|
|
|
421
|
|
|
422 return NGX_OK;
|
|
50
|
423 }
|
|
|
424
|
|
|
425
|
|
|
426 static void *
|
|
|
427 ngx_http_headers_create_conf(ngx_conf_t *cf)
|
|
126
|
428 {
|
|
50
|
429 ngx_http_headers_conf_t *conf;
|
|
|
430
|
|
122
|
431 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_headers_conf_t));
|
|
50
|
432 if (conf == NULL) {
|
|
496
|
433 return NULL;
|
|
50
|
434 }
|
|
|
435
|
|
122
|
436 /*
|
|
|
437 * set by ngx_pcalloc():
|
|
|
438 *
|
|
|
439 * conf->headers = NULL;
|
|
376
|
440 * conf->expires_time = 0;
|
|
122
|
441 */
|
|
|
442
|
|
668
|
443 conf->expires = NGX_HTTP_EXPIRES_UNSET;
|
|
50
|
444
|
|
|
445 return conf;
|
|
|
446 }
|
|
|
447
|
|
|
448
|
|
|
449 static char *
|
|
|
450 ngx_http_headers_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
451 {
|
|
|
452 ngx_http_headers_conf_t *prev = parent;
|
|
|
453 ngx_http_headers_conf_t *conf = child;
|
|
|
454
|
|
668
|
455 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
|
|
376
|
456 conf->expires = prev->expires;
|
|
|
457 conf->expires_time = prev->expires_time;
|
|
|
458
|
|
668
|
459 if (conf->expires == NGX_HTTP_EXPIRES_UNSET) {
|
|
376
|
460 conf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
461 }
|
|
122
|
462 }
|
|
|
463
|
|
|
464 if (conf->headers == NULL) {
|
|
|
465 conf->headers = prev->headers;
|
|
|
466 }
|
|
|
467
|
|
50
|
468 return NGX_CONF_OK;
|
|
|
469 }
|
|
|
470
|
|
|
471
|
|
230
|
472 static ngx_int_t
|
|
|
473 ngx_http_headers_filter_init(ngx_conf_t *cf)
|
|
|
474 {
|
|
|
475 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
476 ngx_http_top_header_filter = ngx_http_headers_filter;
|
|
|
477
|
|
|
478 return NGX_OK;
|
|
|
479 }
|
|
|
480
|
|
|
481
|
|
50
|
482 static char *
|
|
|
483 ngx_http_headers_expires(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
484 {
|
|
|
485 ngx_http_headers_conf_t *hcf = conf;
|
|
|
486
|
|
376
|
487 ngx_uint_t minus, n;
|
|
50
|
488 ngx_str_t *value;
|
|
|
489
|
|
668
|
490 if (hcf->expires != NGX_HTTP_EXPIRES_UNSET) {
|
|
50
|
491 return "is duplicate";
|
|
|
492 }
|
|
|
493
|
|
|
494 value = cf->args->elts;
|
|
|
495
|
|
376
|
496 if (cf->args->nelts == 2) {
|
|
|
497
|
|
|
498 if (ngx_strcmp(value[1].data, "epoch") == 0) {
|
|
|
499 hcf->expires = NGX_HTTP_EXPIRES_EPOCH;
|
|
|
500 return NGX_CONF_OK;
|
|
|
501 }
|
|
|
502
|
|
|
503 if (ngx_strcmp(value[1].data, "max") == 0) {
|
|
|
504 hcf->expires = NGX_HTTP_EXPIRES_MAX;
|
|
|
505 return NGX_CONF_OK;
|
|
|
506 }
|
|
50
|
507
|
|
376
|
508 if (ngx_strcmp(value[1].data, "off") == 0) {
|
|
|
509 hcf->expires = NGX_HTTP_EXPIRES_OFF;
|
|
|
510 return NGX_CONF_OK;
|
|
|
511 }
|
|
|
512
|
|
|
513 hcf->expires = NGX_HTTP_EXPIRES_ACCESS;
|
|
|
514
|
|
|
515 n = 1;
|
|
|
516
|
|
|
517 } else { /* cf->args->nelts == 3 */
|
|
|
518
|
|
|
519 if (ngx_strcmp(value[1].data, "modified") != 0) {
|
|
|
520 return "invalid value";
|
|
|
521 }
|
|
|
522
|
|
|
523 hcf->expires = NGX_HTTP_EXPIRES_MODIFIED;
|
|
|
524
|
|
|
525 n = 2;
|
|
238
|
526 }
|
|
|
527
|
|
394
|
528 if (value[n].data[0] == '@') {
|
|
|
529 value[n].data++;
|
|
|
530 value[n].len--;
|
|
|
531 minus = 0;
|
|
|
532
|
|
|
533 if (hcf->expires == NGX_HTTP_EXPIRES_MODIFIED) {
|
|
640
|
534 return "daily time cannot be used with \"modified\" parameter";
|
|
394
|
535 }
|
|
|
536
|
|
|
537 hcf->expires = NGX_HTTP_EXPIRES_DAILY;
|
|
|
538
|
|
|
539 } else if (value[n].data[0] == '+') {
|
|
376
|
540 value[n].data++;
|
|
|
541 value[n].len--;
|
|
50
|
542 minus = 0;
|
|
|
543
|
|
376
|
544 } else if (value[n].data[0] == '-') {
|
|
|
545 value[n].data++;
|
|
|
546 value[n].len--;
|
|
50
|
547 minus = 1;
|
|
|
548
|
|
|
549 } else {
|
|
|
550 minus = 0;
|
|
|
551 }
|
|
|
552
|
|
376
|
553 hcf->expires_time = ngx_parse_time(&value[n], 1);
|
|
50
|
554
|
|
662
|
555 if (hcf->expires_time == (time_t) NGX_ERROR) {
|
|
50
|
556 return "invalid value";
|
|
|
557 }
|
|
126
|
558
|
|
394
|
559 if (hcf->expires == NGX_HTTP_EXPIRES_DAILY
|
|
|
560 && hcf->expires_time > 24 * 60 * 60)
|
|
|
561 {
|
|
|
562 return "daily time value must be less than 24 hours";
|
|
|
563 }
|
|
|
564
|
|
50
|
565 if (minus) {
|
|
376
|
566 hcf->expires_time = - hcf->expires_time;
|
|
50
|
567 }
|
|
|
568
|
|
|
569 return NGX_CONF_OK;
|
|
|
570 }
|
|
122
|
571
|
|
|
572
|
|
|
573 static char *
|
|
|
574 ngx_http_headers_add(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
575 {
|
|
|
576 ngx_http_headers_conf_t *hcf = conf;
|
|
|
577
|
|
464
|
578 ngx_str_t *value;
|
|
|
579 ngx_uint_t i;
|
|
|
580 ngx_http_header_val_t *hv;
|
|
|
581 ngx_http_set_header_t *set;
|
|
|
582 ngx_http_compile_complex_value_t ccv;
|
|
122
|
583
|
|
|
584 value = cf->args->elts;
|
|
|
585
|
|
|
586 if (hcf->headers == NULL) {
|
|
174
|
587 hcf->headers = ngx_array_create(cf->pool, 1,
|
|
|
588 sizeof(ngx_http_header_val_t));
|
|
122
|
589 if (hcf->headers == NULL) {
|
|
|
590 return NGX_CONF_ERROR;
|
|
|
591 }
|
|
|
592 }
|
|
|
593
|
|
464
|
594 hv = ngx_array_push(hcf->headers);
|
|
|
595 if (hv == NULL) {
|
|
122
|
596 return NGX_CONF_ERROR;
|
|
|
597 }
|
|
|
598
|
|
464
|
599 hv->key = value[1];
|
|
|
600 hv->handler = ngx_http_add_header;
|
|
|
601 hv->offset = 0;
|
|
174
|
602
|
|
464
|
603 set = ngx_http_set_headers;
|
|
|
604 for (i = 0; set[i].name.len; i++) {
|
|
|
605 if (ngx_strcasecmp(value[1].data, set[i].name.data) != 0) {
|
|
326
|
606 continue;
|
|
|
607 }
|
|
|
608
|
|
464
|
609 hv->offset = set[i].offset;
|
|
|
610 hv->handler = set[i].handler;
|
|
|
611
|
|
326
|
612 break;
|
|
|
613 }
|
|
|
614
|
|
466
|
615 if (value[2].len == 0) {
|
|
|
616 ngx_memzero(&hv->value, sizeof(ngx_http_complex_value_t));
|
|
|
617 return NGX_CONF_OK;
|
|
|
618 }
|
|
|
619
|
|
464
|
620 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
|
|
174
|
621
|
|
464
|
622 ccv.cf = cf;
|
|
|
623 ccv.value = &value[2];
|
|
|
624 ccv.complex_value = &hv->value;
|
|
174
|
625
|
|
464
|
626 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
|
|
174
|
627 return NGX_CONF_ERROR;
|
|
|
628 }
|
|
122
|
629
|
|
|
630 return NGX_CONF_OK;
|
|
|
631 }
|
