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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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660
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4 * Copyright (C) Nginx, Inc.
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178
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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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13 typedef struct {
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394
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14 ngx_str_t before_body;
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15 ngx_str_t after_body;
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16
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17 ngx_hash_t types;
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18 ngx_array_t *types_keys;
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178
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19 } ngx_http_addition_conf_t;
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20
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21
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22 typedef struct {
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394
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23 ngx_uint_t before_body_sent;
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178
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24 } ngx_http_addition_ctx_t;
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25
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26
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27 static void *ngx_http_addition_create_conf(ngx_conf_t *cf);
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28 static char *ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent,
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29 void *child);
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230
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30 static ngx_int_t ngx_http_addition_filter_init(ngx_conf_t *cf);
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178
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31
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32
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33 static ngx_command_t ngx_http_addition_commands[] = {
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34
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35 { ngx_string("add_before_body"),
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36 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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37 ngx_conf_set_str_slot,
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38 NGX_HTTP_LOC_CONF_OFFSET,
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39 offsetof(ngx_http_addition_conf_t, before_body),
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40 NULL },
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41
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42 { ngx_string("add_after_body"),
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43 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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44 ngx_conf_set_str_slot,
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45 NGX_HTTP_LOC_CONF_OFFSET,
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46 offsetof(ngx_http_addition_conf_t, after_body),
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47 NULL },
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48
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528
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49 { ngx_string("addition_types"),
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394
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50 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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51 ngx_http_types_slot,
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52 NGX_HTTP_LOC_CONF_OFFSET,
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53 offsetof(ngx_http_addition_conf_t, types_keys),
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54 &ngx_http_html_default_types[0] },
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55
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178
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56 ngx_null_command
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57 };
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58
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59
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60 static ngx_http_module_t ngx_http_addition_filter_module_ctx = {
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61 NULL, /* preconfiguration */
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230
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62 ngx_http_addition_filter_init, /* postconfiguration */
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178
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63
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64 NULL, /* create main configuration */
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65 NULL, /* init main configuration */
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66
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67 NULL, /* create server configuration */
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68 NULL, /* merge server configuration */
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69
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70 ngx_http_addition_create_conf, /* create location configuration */
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71 ngx_http_addition_merge_conf /* merge location configuration */
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72 };
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73
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74
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75 ngx_module_t ngx_http_addition_filter_module = {
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76 NGX_MODULE_V1,
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77 &ngx_http_addition_filter_module_ctx, /* module context */
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78 ngx_http_addition_commands, /* module directives */
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79 NGX_HTTP_MODULE, /* module type */
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80 NULL, /* init master */
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230
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81 NULL, /* init module */
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178
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82 NULL, /* init process */
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83 NULL, /* init thread */
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84 NULL, /* exit thread */
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85 NULL, /* exit process */
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86 NULL, /* exit master */
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87 NGX_MODULE_V1_PADDING
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88 };
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89
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90
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91 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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92 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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93
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94
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95 static ngx_int_t
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96 ngx_http_addition_header_filter(ngx_http_request_t *r)
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97 {
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98 ngx_http_addition_ctx_t *ctx;
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99 ngx_http_addition_conf_t *conf;
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100
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394
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101 if (r->headers_out.status != NGX_HTTP_OK || r != r->main) {
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178
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102 return ngx_http_next_header_filter(r);
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103 }
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104
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180
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105 conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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106
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107 if (conf->before_body.len == 0 && conf->after_body.len == 0) {
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108 return ngx_http_next_header_filter(r);
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109 }
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110
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394
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111 if (ngx_http_test_content_type(r, &conf->types) == NULL) {
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178
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112 return ngx_http_next_header_filter(r);
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113 }
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114
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115 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_addition_ctx_t));
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116 if (ctx == NULL) {
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117 return NGX_ERROR;
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118 }
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119
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120 ngx_http_set_ctx(r, ctx, ngx_http_addition_filter_module);
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121
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122 ngx_http_clear_content_length(r);
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123 ngx_http_clear_accept_ranges(r);
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124
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125 return ngx_http_next_header_filter(r);
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126 }
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127
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128
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129 static ngx_int_t
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130 ngx_http_addition_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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131 {
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132 ngx_int_t rc;
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133 ngx_uint_t last;
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134 ngx_chain_t *cl;
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244
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135 ngx_http_request_t *sr;
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178
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136 ngx_http_addition_ctx_t *ctx;
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137 ngx_http_addition_conf_t *conf;
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138
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139 if (in == NULL || r->header_only) {
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140 return ngx_http_next_body_filter(r, in);
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141 }
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142
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143 ctx = ngx_http_get_module_ctx(r, ngx_http_addition_filter_module);
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144
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145 if (ctx == NULL) {
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146 return ngx_http_next_body_filter(r, in);
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147 }
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148
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149 conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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150
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151 if (!ctx->before_body_sent) {
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152 ctx->before_body_sent = 1;
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153
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154 if (conf->before_body.len) {
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426
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155 if (ngx_http_subrequest(r, &conf->before_body, NULL, &sr, NULL, 0)
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156 != NGX_OK)
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157 {
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158 return NGX_ERROR;
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178
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159 }
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160 }
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161 }
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162
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256
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163 if (conf->after_body.len == 0) {
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164 ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
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165 return ngx_http_next_body_filter(r, in);
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166 }
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167
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178
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168 last = 0;
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169
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170 for (cl = in; cl; cl = cl->next) {
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171 if (cl->buf->last_buf) {
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172 cl->buf->last_buf = 0;
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180
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173 cl->buf->sync = 1;
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178
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174 last = 1;
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175 }
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176 }
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177
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178 rc = ngx_http_next_body_filter(r, in);
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179
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180
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180 if (rc == NGX_ERROR || !last || conf->after_body.len == 0) {
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178
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181 return rc;
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182 }
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183
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426
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184 if (ngx_http_subrequest(r, &conf->after_body, NULL, &sr, NULL, 0)
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185 != NGX_OK)
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186 {
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187 return NGX_ERROR;
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178
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188 }
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189
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180
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190 ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
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178
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191
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192 return ngx_http_send_special(r, NGX_HTTP_LAST);
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193 }
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194
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195
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196 static ngx_int_t
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230
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197 ngx_http_addition_filter_init(ngx_conf_t *cf)
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178
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198 {
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199 ngx_http_next_header_filter = ngx_http_top_header_filter;
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200 ngx_http_top_header_filter = ngx_http_addition_header_filter;
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201
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202 ngx_http_next_body_filter = ngx_http_top_body_filter;
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203 ngx_http_top_body_filter = ngx_http_addition_body_filter;
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204
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205 return NGX_OK;
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206 }
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207
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208
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209 static void *
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210 ngx_http_addition_create_conf(ngx_conf_t *cf)
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211 {
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212 ngx_http_addition_conf_t *conf;
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213
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214 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_addition_conf_t));
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215 if (conf == NULL) {
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496
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216 return NULL;
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178
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217 }
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218
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219 /*
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220 * set by ngx_pcalloc():
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221 *
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394
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222 * conf->before_body = { 0, NULL };
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223 * conf->after_body = { 0, NULL };
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224 * conf->types = { NULL };
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225 * conf->types_keys = NULL;
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178
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226 */
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227
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228 return conf;
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229 }
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230
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231
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232 static char *
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233 ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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234 {
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235 ngx_http_addition_conf_t *prev = parent;
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236 ngx_http_addition_conf_t *conf = child;
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237
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238 ngx_conf_merge_str_value(conf->before_body, prev->before_body, "");
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239 ngx_conf_merge_str_value(conf->after_body, prev->after_body, "");
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240
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554
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241 if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
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242 &prev->types_keys, &prev->types,
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394
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243 ngx_http_html_default_types)
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244 != NGX_OK)
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245 {
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246 return NGX_CONF_ERROR;
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247 }
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248
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178
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249 return NGX_CONF_OK;
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250 }
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