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7072
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1
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2 /*
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3 * Copyright (C) Roman Arutyunyan
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4 * Copyright (C) Nginx, Inc.
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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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14 ngx_array_t *mirror;
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15 ngx_flag_t request_body;
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16 } ngx_http_mirror_loc_conf_t;
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17
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18
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19 typedef struct {
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20 ngx_int_t status;
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21 } ngx_http_mirror_ctx_t;
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22
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23
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24 static ngx_int_t ngx_http_mirror_handler(ngx_http_request_t *r);
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25 static void ngx_http_mirror_body_handler(ngx_http_request_t *r);
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26 static ngx_int_t ngx_http_mirror_handler_internal(ngx_http_request_t *r);
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27 static void *ngx_http_mirror_create_loc_conf(ngx_conf_t *cf);
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28 static char *ngx_http_mirror_merge_loc_conf(ngx_conf_t *cf, void *parent,
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29 void *child);
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30 static ngx_int_t ngx_http_mirror_init(ngx_conf_t *cf);
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31
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32
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33 static ngx_command_t ngx_http_mirror_commands[] = {
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34
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35 { ngx_string("mirror"),
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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_array_slot,
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38 NGX_HTTP_LOC_CONF_OFFSET,
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39 offsetof(ngx_http_mirror_loc_conf_t, mirror),
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40 NULL },
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41
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42 { ngx_string("mirror_request_body"),
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43 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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44 ngx_conf_set_flag_slot,
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45 NGX_HTTP_LOC_CONF_OFFSET,
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46 offsetof(ngx_http_mirror_loc_conf_t, request_body),
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47 NULL },
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48
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49 ngx_null_command
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50 };
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51
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52
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53 static ngx_http_module_t ngx_http_mirror_module_ctx = {
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54 NULL, /* preconfiguration */
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55 ngx_http_mirror_init, /* postconfiguration */
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56
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57 NULL, /* create main configuration */
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58 NULL, /* init main configuration */
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59
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60 NULL, /* create server configuration */
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61 NULL, /* merge server configuration */
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62
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63 ngx_http_mirror_create_loc_conf, /* create location configuration */
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64 ngx_http_mirror_merge_loc_conf /* merge location configuration */
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65 };
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66
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67
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68 ngx_module_t ngx_http_mirror_module = {
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69 NGX_MODULE_V1,
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70 &ngx_http_mirror_module_ctx, /* module context */
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71 ngx_http_mirror_commands, /* module directives */
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72 NGX_HTTP_MODULE, /* module type */
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73 NULL, /* init master */
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74 NULL, /* init module */
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75 NULL, /* init process */
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76 NULL, /* init thread */
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77 NULL, /* exit thread */
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78 NULL, /* exit process */
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79 NULL, /* exit master */
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80 NGX_MODULE_V1_PADDING
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81 };
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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_mirror_handler(ngx_http_request_t *r)
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86 {
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87 ngx_int_t rc;
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88 ngx_http_mirror_ctx_t *ctx;
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89 ngx_http_mirror_loc_conf_t *mlcf;
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90
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91 if (r != r->main) {
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92 return NGX_DECLINED;
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93 }
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94
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95 mlcf = ngx_http_get_module_loc_conf(r, ngx_http_mirror_module);
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96
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97 if (mlcf->mirror == NULL) {
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98 return NGX_DECLINED;
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99 }
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100
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101 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "mirror handler");
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102
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103 if (mlcf->request_body) {
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104 ctx = ngx_http_get_module_ctx(r, ngx_http_mirror_module);
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105
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106 if (ctx) {
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107 return ctx->status;
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108 }
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109
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110 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_mirror_ctx_t));
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111 if (ctx == NULL) {
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112 return NGX_ERROR;
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113 }
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114
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115 ctx->status = NGX_DONE;
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116
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117 ngx_http_set_ctx(r, ctx, ngx_http_mirror_module);
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118
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119 rc = ngx_http_read_client_request_body(r, ngx_http_mirror_body_handler);
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120 if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
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121 return rc;
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122 }
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123
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124 ngx_http_finalize_request(r, NGX_DONE);
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125 return NGX_DONE;
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126 }
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127
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128 return ngx_http_mirror_handler_internal(r);
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129 }
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130
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131
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132 static void
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133 ngx_http_mirror_body_handler(ngx_http_request_t *r)
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134 {
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135 ngx_http_mirror_ctx_t *ctx;
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136
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137 ctx = ngx_http_get_module_ctx(r, ngx_http_mirror_module);
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138
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139 ctx->status = ngx_http_mirror_handler_internal(r);
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140
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141 r->preserve_body = 1;
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142
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143 r->write_event_handler = ngx_http_core_run_phases;
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144 ngx_http_core_run_phases(r);
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145 }
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146
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147
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148 static ngx_int_t
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149 ngx_http_mirror_handler_internal(ngx_http_request_t *r)
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150 {
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151 ngx_str_t *name;
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152 ngx_uint_t i;
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153 ngx_http_request_t *sr;
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154 ngx_http_mirror_loc_conf_t *mlcf;
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155
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156 mlcf = ngx_http_get_module_loc_conf(r, ngx_http_mirror_module);
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157
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158 name = mlcf->mirror->elts;
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159
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160 for (i = 0; i < mlcf->mirror->nelts; i++) {
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161 if (ngx_http_subrequest(r, &name[i], &r->args, &sr, NULL,
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162 NGX_HTTP_SUBREQUEST_BACKGROUND)
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163 != NGX_OK)
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164 {
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165 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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166 }
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167
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168 sr->header_only = 1;
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169 sr->method = r->method;
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170 sr->method_name = r->method_name;
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171 }
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172
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173 return NGX_DECLINED;
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174 }
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175
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176
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177 static void *
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178 ngx_http_mirror_create_loc_conf(ngx_conf_t *cf)
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179 {
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180 ngx_http_mirror_loc_conf_t *mlcf;
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181
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182 mlcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_mirror_loc_conf_t));
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183 if (mlcf == NULL) {
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184 return NULL;
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185 }
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186
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187 mlcf->mirror = NGX_CONF_UNSET_PTR;
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188 mlcf->request_body = NGX_CONF_UNSET;
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189
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190 return mlcf;
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191 }
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192
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193
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194 static char *
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195 ngx_http_mirror_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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196 {
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197 ngx_http_mirror_loc_conf_t *prev = parent;
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198 ngx_http_mirror_loc_conf_t *conf = child;
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199
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200 ngx_conf_merge_ptr_value(conf->mirror, prev->mirror, NULL);
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201 ngx_conf_merge_value(conf->request_body, prev->request_body, 1);
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202
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203 return NGX_CONF_OK;
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204 }
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205
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206
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207 static ngx_int_t
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208 ngx_http_mirror_init(ngx_conf_t *cf)
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209 {
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210 ngx_http_handler_pt *h;
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211 ngx_http_core_main_conf_t *cmcf;
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212
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213 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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214
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215 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PRECONTENT_PHASE].handlers);
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216 if (h == NULL) {
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217 return NGX_ERROR;
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218 }
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219
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220 *h = ngx_http_mirror_handler;
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221
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222 return NGX_OK;
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223 }
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