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ngx_http_addition_filter_module.c
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1 
2 /*
3  * Copyright (C) Igor Sysoev
4  * Copyright (C) Nginx, Inc.
5  */
6 
7 
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_http.h>
11 
12 
13 typedef struct {
14  ngx_str_t before_body;
15  ngx_str_t after_body;
16 
17  ngx_hash_t types;
18  ngx_array_t *types_keys;
19 } ngx_http_addition_conf_t;
20 
21 
22 typedef struct {
23  ngx_uint_t before_body_sent;
24 } ngx_http_addition_ctx_t;
25 
26 
27 static void *ngx_http_addition_create_conf(ngx_conf_t *cf);
28 static char *ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent,
29  void *child);
30 static ngx_int_t ngx_http_addition_filter_init(ngx_conf_t *cf);
31 
32 
33 static ngx_command_t ngx_http_addition_commands[] = {
34 
35  { ngx_string("add_before_body"),
36  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
37  ngx_conf_set_str_slot,
38  NGX_HTTP_LOC_CONF_OFFSET,
39  offsetof(ngx_http_addition_conf_t, before_body),
40  NULL },
41 
42  { ngx_string("add_after_body"),
43  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
44  ngx_conf_set_str_slot,
45  NGX_HTTP_LOC_CONF_OFFSET,
46  offsetof(ngx_http_addition_conf_t, after_body),
47  NULL },
48 
49  { ngx_string("addition_types"),
50  NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
51  ngx_http_types_slot,
52  NGX_HTTP_LOC_CONF_OFFSET,
53  offsetof(ngx_http_addition_conf_t, types_keys),
54  &ngx_http_html_default_types[0] },
55 
56  ngx_null_command
57 };
58 
59 
60 static ngx_http_module_t ngx_http_addition_filter_module_ctx = {
61  NULL, /* preconfiguration */
62  ngx_http_addition_filter_init, /* postconfiguration */
63 
64  NULL, /* create main configuration */
65  NULL, /* init main configuration */
66 
67  NULL, /* create server configuration */
68  NULL, /* merge server configuration */
69 
70  ngx_http_addition_create_conf, /* create location configuration */
71  ngx_http_addition_merge_conf /* merge location configuration */
72 };
73 
74 
75 ngx_module_t ngx_http_addition_filter_module = {
76  NGX_MODULE_V1,
77  &ngx_http_addition_filter_module_ctx, /* module context */
78  ngx_http_addition_commands, /* module directives */
79  NGX_HTTP_MODULE, /* module type */
80  NULL, /* init master */
81  NULL, /* init module */
82  NULL, /* init process */
83  NULL, /* init thread */
84  NULL, /* exit thread */
85  NULL, /* exit process */
86  NULL, /* exit master */
87  NGX_MODULE_V1_PADDING
88 };
89 
90 
91 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
92 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
93 
94 
95 static ngx_int_t
96 ngx_http_addition_header_filter(ngx_http_request_t *r)
97 {
98  ngx_http_addition_ctx_t *ctx;
99  ngx_http_addition_conf_t *conf;
100 
101  if (r->headers_out.status != NGX_HTTP_OK || r != r->main) {
102  return ngx_http_next_header_filter(r);
103  }
104 
105  conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
106 
107  if (conf->before_body.len == 0 && conf->after_body.len == 0) {
108  return ngx_http_next_header_filter(r);
109  }
110 
111  if (ngx_http_test_content_type(r, &conf->types) == NULL) {
112  return ngx_http_next_header_filter(r);
113  }
114 
115  ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_addition_ctx_t));
116  if (ctx == NULL) {
117  return NGX_ERROR;
118  }
119 
120  ngx_http_set_ctx(r, ctx, ngx_http_addition_filter_module);
121 
122  ngx_http_clear_content_length(r);
123  ngx_http_clear_accept_ranges(r);
124  ngx_http_clear_etag(r);
125 
126  return ngx_http_next_header_filter(r);
127 }
128 
129 
130 static ngx_int_t
131 ngx_http_addition_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
132 {
133  ngx_int_t rc;
134  ngx_uint_t last;
135  ngx_chain_t *cl;
136  ngx_http_request_t *sr;
137  ngx_http_addition_ctx_t *ctx;
138  ngx_http_addition_conf_t *conf;
139 
140  if (in == NULL || r->header_only) {
141  return ngx_http_next_body_filter(r, in);
142  }
143 
144  ctx = ngx_http_get_module_ctx(r, ngx_http_addition_filter_module);
145 
146  if (ctx == NULL) {
147  return ngx_http_next_body_filter(r, in);
148  }
149 
150  conf = ngx_http_get_module_loc_conf(r, ngx_http_addition_filter_module);
151 
152  if (!ctx->before_body_sent) {
153  ctx->before_body_sent = 1;
154 
155  if (conf->before_body.len) {
156  if (ngx_http_subrequest(r, &conf->before_body, NULL, &sr, NULL, 0)
157  != NGX_OK)
158  {
159  return NGX_ERROR;
160  }
161  }
162  }
163 
164  if (conf->after_body.len == 0) {
165  ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
166  return ngx_http_next_body_filter(r, in);
167  }
168 
169  last = 0;
170 
171  for (cl = in; cl; cl = cl->next) {
172  if (cl->buf->last_buf) {
173  cl->buf->last_buf = 0;
174  cl->buf->sync = 1;
175  last = 1;
176  }
177  }
178 
179  rc = ngx_http_next_body_filter(r, in);
180 
181  if (rc == NGX_ERROR || !last || conf->after_body.len == 0) {
182  return rc;
183  }
184 
185  if (ngx_http_subrequest(r, &conf->after_body, NULL, &sr, NULL, 0)
186  != NGX_OK)
187  {
188  return NGX_ERROR;
189  }
190 
191  ngx_http_set_ctx(r, NULL, ngx_http_addition_filter_module);
192 
193  return ngx_http_send_special(r, NGX_HTTP_LAST);
194 }
195 
196 
197 static ngx_int_t
198 ngx_http_addition_filter_init(ngx_conf_t *cf)
199 {
200  ngx_http_next_header_filter = ngx_http_top_header_filter;
201  ngx_http_top_header_filter = ngx_http_addition_header_filter;
202 
203  ngx_http_next_body_filter = ngx_http_top_body_filter;
204  ngx_http_top_body_filter = ngx_http_addition_body_filter;
205 
206  return NGX_OK;
207 }
208 
209 
210 static void *
211 ngx_http_addition_create_conf(ngx_conf_t *cf)
212 {
213  ngx_http_addition_conf_t *conf;
214 
215  conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_addition_conf_t));
216  if (conf == NULL) {
217  return NULL;
218  }
219 
220  /*
221  * set by ngx_pcalloc():
222  *
223  * conf->before_body = { 0, NULL };
224  * conf->after_body = { 0, NULL };
225  * conf->types = { NULL };
226  * conf->types_keys = NULL;
227  */
228 
229  return conf;
230 }
231 
232 
233 static char *
234 ngx_http_addition_merge_conf(ngx_conf_t *cf, void *parent, void *child)
235 {
236  ngx_http_addition_conf_t *prev = parent;
237  ngx_http_addition_conf_t *conf = child;
238 
239  ngx_conf_merge_str_value(conf->before_body, prev->before_body, "");
240  ngx_conf_merge_str_value(conf->after_body, prev->after_body, "");
241 
242  if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types,
243  &prev->types_keys, &prev->types,
244  ngx_http_html_default_types)
245  != NGX_OK)
246  {
247  return NGX_CONF_ERROR;
248  }
249 
250  return NGX_CONF_OK;
251 }
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