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629
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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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13 ngx_str_t before_body;
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14 ngx_str_t after_body;
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15 } ngx_http_addition_conf_t;
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16
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17
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18 typedef struct {
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19 unsigned before_body_sent:1;
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20 unsigned after_body_sent:1;
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21 } ngx_http_addition_ctx_t;
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22
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23
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24 static ngx_int_t ngx_http_addition_filter_init(ngx_cycle_t *cycle);
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25 static void *ngx_http_addition_create_conf(ngx_conf_t *cf);
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26 static char *ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent,
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27 void *child);
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28
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29
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30 static ngx_command_t ngx_http_addition_commands[] = {
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31
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32 { ngx_string("add_before_body"),
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33 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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34 ngx_conf_set_str_slot,
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35 NGX_HTTP_LOC_CONF_OFFSET,
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36 offsetof(ngx_http_addition_conf_t, before_body),
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37 NULL },
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38
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39 { ngx_string("add_after_body"),
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40 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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41 ngx_conf_set_str_slot,
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42 NGX_HTTP_LOC_CONF_OFFSET,
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43 offsetof(ngx_http_addition_conf_t, after_body),
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44 NULL },
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45
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46 ngx_null_command
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47 };
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48
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49
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50 static ngx_http_module_t ngx_http_addition_filter_module_ctx = {
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51 NULL, /* preconfiguration */
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52 NULL, /* postconfiguration */
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53
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54 NULL, /* create main configuration */
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55 NULL, /* init main configuration */
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56
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57 NULL, /* create server configuration */
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58 NULL, /* merge server configuration */
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59
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60 ngx_http_addition_create_conf, /* create location configuration */
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61 ngx_http_addition_merge_conf /* merge location configuration */
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62 };
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63
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64
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65 ngx_module_t ngx_http_addition_filter_module = {
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66 NGX_MODULE_V1,
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67 &ngx_http_addition_filter_module_ctx, /* module context */
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68 ngx_http_addition_commands, /* module directives */
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69 NGX_HTTP_MODULE, /* module type */
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70 NULL, /* init master */
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71 ngx_http_addition_filter_init, /* init module */
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72 NULL, /* init process */
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73 NULL, /* init thread */
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74 NULL, /* exit thread */
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75 NULL, /* exit process */
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76 NULL, /* exit master */
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77 NGX_MODULE_V1_PADDING
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78 };
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79
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80
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81 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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82 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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83
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84
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85 static ngx_int_t
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86 ngx_http_addition_header_filter(ngx_http_request_t *r)
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87 {
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88 ngx_http_addition_ctx_t *ctx;
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89 ngx_http_addition_conf_t *conf;
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90
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91 if (r->headers_out.status != NGX_HTTP_OK || r != r->main) {
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92 return ngx_http_next_header_filter(r);
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93 }
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94
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95 if (ngx_strncasecmp(r->headers_out.content_type.data, "text/html",
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96 sizeof("text/html") - 1)
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97 != 0)
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98 {
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99 return ngx_http_next_header_filter(r);
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100 }
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101
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102 conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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103
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104 if (conf->before_body.len == 0 && conf->after_body.len == 0) {
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105 return ngx_http_next_header_filter(r);
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106 }
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107
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108 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_addition_ctx_t));
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109 if (ctx == NULL) {
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110 return NGX_ERROR;
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111 }
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112
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113 ngx_http_set_ctx(r, ctx, ngx_http_addition_filter_module);
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114
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115 ngx_http_clear_content_length(r);
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116 ngx_http_clear_accept_ranges(r);
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117
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118 return ngx_http_next_header_filter(r);
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119 }
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120
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121
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122 static ngx_int_t
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123 ngx_http_addition_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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124 {
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125 ngx_int_t rc;
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126 ngx_uint_t last;
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127 ngx_chain_t *cl;
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128 ngx_http_addition_ctx_t *ctx;
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129 ngx_http_addition_conf_t *conf;
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130
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131 if (in == NULL || r->header_only) {
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132 return ngx_http_next_body_filter(r, in);
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133 }
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134
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135 ctx = ngx_http_get_module_ctx(r, ngx_http_addition_filter_module);
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136
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137 if (ctx == NULL) {
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138 return ngx_http_next_body_filter(r, in);
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139 }
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140
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141 conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
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142
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143 if (!ctx->before_body_sent) {
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144 ctx->before_body_sent = 1;
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145
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146 if (conf->before_body.len) {
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147 if (ngx_http_subrequest(r, &conf->before_body, NULL, 0) != NGX_OK) {
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148 return NGX_ERROR;
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149 }
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150 }
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151 }
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152
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153 last = 0;
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154
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155 for (cl = in; cl; cl = cl->next) {
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156 if (cl->buf->last_buf) {
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157 cl->buf->last_buf = 0;
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158 last = 1;
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159 }
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160 }
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161
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162 rc = ngx_http_next_body_filter(r, in);
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163
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164 if (rc == NGX_ERROR
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165 || !last
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166 || ctx->after_body_sent
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167 || conf->after_body.len == 0)
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168 {
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169 return rc;
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170 }
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171
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172 if (ngx_http_subrequest(r, &conf->after_body, NULL, 0) != NGX_OK) {
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173 return NGX_ERROR;
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174 }
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175
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176 ctx->after_body_sent = 1;
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177
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178 return ngx_http_send_special(r, NGX_HTTP_LAST);
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179 }
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180
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181
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182 static ngx_int_t
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183 ngx_http_addition_filter_init(ngx_cycle_t *cycle)
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184 {
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185 ngx_http_next_header_filter = ngx_http_top_header_filter;
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186 ngx_http_top_header_filter = ngx_http_addition_header_filter;
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187
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188 ngx_http_next_body_filter = ngx_http_top_body_filter;
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189 ngx_http_top_body_filter = ngx_http_addition_body_filter;
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190
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191 return NGX_OK;
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192 }
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193
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194
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195 static void *
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196 ngx_http_addition_create_conf(ngx_conf_t *cf)
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197 {
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198 ngx_http_addition_conf_t *conf;
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199
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200 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_addition_conf_t));
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201 if (conf == NULL) {
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202 return NGX_CONF_ERROR;
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203 }
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204
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205 /*
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206 * set by ngx_pcalloc():
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207 *
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208 * conf->before_body.len = 0;
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209 * conf->before_body.date = NULL;
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210 * conf->after_body.len = 0;
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211 * conf->after_body.date = NULL;
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212 */
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213
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214 return conf;
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215 }
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216
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217
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218 static char *
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219 ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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220 {
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221 ngx_http_addition_conf_t *prev = parent;
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222 ngx_http_addition_conf_t *conf = child;
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223
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224 ngx_conf_merge_str_value(conf->before_body, prev->before_body, "");
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225 ngx_conf_merge_str_value(conf->after_body, prev->after_body, "");
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226
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227 return NGX_CONF_OK;
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228 }
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