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