Annotation of embedaddon/nginx/src/http/modules/ngx_http_addition_filter_module.c, revision 1.1.1.1
1.1 misho 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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