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178
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 typedef struct {
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394
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13 ngx_str_t before_body;
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14 ngx_str_t after_body;
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15
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16 ngx_hash_t types;
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17 ngx_array_t *types_keys;
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178
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18 } ngx_http_addition_conf_t;
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19
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20
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21 typedef struct {
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394
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22 ngx_uint_t before_body_sent;
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178
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23 } ngx_http_addition_ctx_t;
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24
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25
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26 static void *ngx_http_addition_create_conf(ngx_conf_t *cf);
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27 static char *ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent,
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28 void *child);
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230
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29 static ngx_int_t ngx_http_addition_filter_init(ngx_conf_t *cf);
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178
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30
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31
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32 static ngx_command_t ngx_http_addition_commands[] = {
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33
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34 { ngx_string("add_before_body"),
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35 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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36 ngx_conf_set_str_slot,
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37 NGX_HTTP_LOC_CONF_OFFSET,
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38 offsetof(ngx_http_addition_conf_t, before_body),
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39 NULL },
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40
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41 { ngx_string("add_after_body"),
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42 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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43 ngx_conf_set_str_slot,
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44 NGX_HTTP_LOC_CONF_OFFSET,
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45 offsetof(ngx_http_addition_conf_t, after_body),
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46 NULL },
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47
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528
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48 { ngx_string("addition_types"),
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394
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49 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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50 ngx_http_types_slot,
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51 NGX_HTTP_LOC_CONF_OFFSET,
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52 offsetof(ngx_http_addition_conf_t, types_keys),
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53 &ngx_http_html_default_types[0] },
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54
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178
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55 ngx_null_command
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56 };
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57
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58
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59 static ngx_http_module_t ngx_http_addition_filter_module_ctx = {
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60 NULL, /* preconfiguration */
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230
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61 ngx_http_addition_filter_init, /* postconfiguration */
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178
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62
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63 NULL, /* create main configuration */
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64 NULL, /* init main configuration */
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65
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66 NULL, /* create server configuration */
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67 NULL, /* merge server configuration */
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68
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69 ngx_http_addition_create_conf, /* create location configuration */
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70 ngx_http_addition_merge_conf /* merge location configuration */
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71 };
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72
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73
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74 ngx_module_t ngx_http_addition_filter_module = {
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75 NGX_MODULE_V1,
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76 &ngx_http_addition_filter_module_ctx, /* module context */
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77 ngx_http_addition_commands, /* module directives */
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78 NGX_HTTP_MODULE, /* module type */
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79 NULL, /* init master */
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230
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80 NULL, /* init module */
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178
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81 NULL, /* init process */
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82 NULL, /* init thread */
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83 NULL, /* exit thread */
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84 NULL, /* exit process */
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85 NULL, /* exit master */
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86 NGX_MODULE_V1_PADDING
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87 };
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88
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89
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90 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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91 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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92
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93
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94 static ngx_int_t
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95 ngx_http_addition_header_filter(ngx_http_request_t *r)
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96 {
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97 ngx_http_addition_ctx_t *ctx;
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98 ngx_http_addition_conf_t *conf;
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99
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394
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100 if (r->headers_out.status != NGX_HTTP_OK || r != r->main) {
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178
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101 return ngx_http_next_header_filter(r);
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102 }
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103
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180
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104 conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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105
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106 if (conf->before_body.len == 0 && conf->after_body.len == 0) {
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107 return ngx_http_next_header_filter(r);
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108 }
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109
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394
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110 if (ngx_http_test_content_type(r, &conf->types) == NULL) {
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178
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111 return ngx_http_next_header_filter(r);
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112 }
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113
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114 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_addition_ctx_t));
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115 if (ctx == NULL) {
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116 return NGX_ERROR;
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117 }
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118
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119 ngx_http_set_ctx(r, ctx, ngx_http_addition_filter_module);
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120
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121 ngx_http_clear_content_length(r);
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122 ngx_http_clear_accept_ranges(r);
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123
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124 return ngx_http_next_header_filter(r);
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125 }
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126
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127
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128 static ngx_int_t
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129 ngx_http_addition_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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130 {
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131 ngx_int_t rc;
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132 ngx_uint_t last;
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133 ngx_chain_t *cl;
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244
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134 ngx_http_request_t *sr;
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178
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135 ngx_http_addition_ctx_t *ctx;
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136 ngx_http_addition_conf_t *conf;
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137
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138 if (in == NULL || r->header_only) {
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139 return ngx_http_next_body_filter(r, in);
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140 }
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141
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142 ctx = ngx_http_get_module_ctx(r, ngx_http_addition_filter_module);
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143
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144 if (ctx == NULL) {
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145 return ngx_http_next_body_filter(r, in);
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146 }
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147
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148 conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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149
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150 if (!ctx->before_body_sent) {
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151 ctx->before_body_sent = 1;
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152
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153 if (conf->before_body.len) {
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426
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154 if (ngx_http_subrequest(r, &conf->before_body, NULL, &sr, NULL, 0)
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155 != NGX_OK)
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156 {
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157 return NGX_ERROR;
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178
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158 }
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159 }
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160 }
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161
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256
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162 if (conf->after_body.len == 0) {
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163 ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
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164 return ngx_http_next_body_filter(r, in);
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165 }
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166
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178
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167 last = 0;
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168
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169 for (cl = in; cl; cl = cl->next) {
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170 if (cl->buf->last_buf) {
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171 cl->buf->last_buf = 0;
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180
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172 cl->buf->sync = 1;
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178
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173 last = 1;
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174 }
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175 }
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176
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177 rc = ngx_http_next_body_filter(r, in);
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178
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180
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179 if (rc == NGX_ERROR || !last || conf->after_body.len == 0) {
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178
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180 return rc;
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181 }
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182
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426
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183 if (ngx_http_subrequest(r, &conf->after_body, NULL, &sr, NULL, 0)
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184 != NGX_OK)
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185 {
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186 return NGX_ERROR;
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178
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187 }
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188
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180
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189 ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
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178
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190
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191 return ngx_http_send_special(r, NGX_HTTP_LAST);
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192 }
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193
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194
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195 static ngx_int_t
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230
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196 ngx_http_addition_filter_init(ngx_conf_t *cf)
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178
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197 {
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198 ngx_http_next_header_filter = ngx_http_top_header_filter;
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199 ngx_http_top_header_filter = ngx_http_addition_header_filter;
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200
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201 ngx_http_next_body_filter = ngx_http_top_body_filter;
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202 ngx_http_top_body_filter = ngx_http_addition_body_filter;
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203
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204 return NGX_OK;
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205 }
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206
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207
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208 static void *
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209 ngx_http_addition_create_conf(ngx_conf_t *cf)
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210 {
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211 ngx_http_addition_conf_t *conf;
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212
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213 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_addition_conf_t));
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214 if (conf == NULL) {
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496
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215 return NULL;
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178
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216 }
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217
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218 /*
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219 * set by ngx_pcalloc():
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220 *
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394
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221 * conf->before_body = { 0, NULL };
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222 * conf->after_body = { 0, NULL };
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223 * conf->types = { NULL };
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224 * conf->types_keys = NULL;
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178
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225 */
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226
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227 return conf;
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228 }
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229
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230
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231 static char *
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232 ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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233 {
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234 ngx_http_addition_conf_t *prev = parent;
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235 ngx_http_addition_conf_t *conf = child;
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236
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237 ngx_conf_merge_str_value(conf->before_body, prev->before_body, "");
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238 ngx_conf_merge_str_value(conf->after_body, prev->after_body, "");
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239
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554
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240 if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
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241 &prev->types_keys, &prev->types,
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394
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242 ngx_http_html_default_types)
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243 != NGX_OK)
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244 {
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245 return NGX_CONF_ERROR;
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246 }
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247
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178
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248 return NGX_CONF_OK;
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249 }
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