Mercurial > hg > nginx
annotate src/http/modules/ngx_http_image_filter_module.c @ 2912:c7d57b539248
return NULL instead of NGX_CONF_ERROR on a create conf failure
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 02 Jun 2009 16:09:44 +0000 |
| parents | 896db5a09bd2 |
| children | 0070504324d8 |
| rev | line source |
|---|---|
| 2788 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_http.h> | |
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10 |
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11 #include <gd.h> |
| 2788 | 12 |
| 13 | |
| 14 #define NGX_HTTP_IMAGE_OFF 0 | |
| 15 #define NGX_HTTP_IMAGE_TEST 1 | |
| 16 #define NGX_HTTP_IMAGE_SIZE 2 | |
| 17 #define NGX_HTTP_IMAGE_RESIZE 3 | |
| 18 #define NGX_HTTP_IMAGE_CROP 4 | |
| 19 | |
| 20 | |
| 21 #define NGX_HTTP_IMAGE_START 0 | |
| 22 #define NGX_HTTP_IMAGE_READ 1 | |
| 23 #define NGX_HTTP_IMAGE_PROCESS 2 | |
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24 #define NGX_HTTP_IMAGE_PASS 3 |
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25 #define NGX_HTTP_IMAGE_DONE 4 |
| 2788 | 26 |
| 27 | |
| 28 #define NGX_HTTP_IMAGE_NONE 0 | |
| 29 #define NGX_HTTP_IMAGE_JPEG 1 | |
| 30 #define NGX_HTTP_IMAGE_GIF 2 | |
| 31 #define NGX_HTTP_IMAGE_PNG 3 | |
| 32 | |
| 33 | |
| 34 #define NGX_HTTP_IMAGE_BUFFERED 0x08 | |
| 35 | |
| 36 | |
| 37 typedef struct { | |
| 38 ngx_uint_t filter; | |
| 39 ngx_uint_t width; | |
| 40 ngx_uint_t height; | |
| 2848 | 41 ngx_int_t jpeg_quality; |
| 2788 | 42 |
| 43 size_t buffer_size; | |
| 44 } ngx_http_image_filter_conf_t; | |
| 45 | |
| 46 | |
| 47 typedef struct { | |
| 48 u_char *image; | |
| 49 u_char *last; | |
| 50 | |
| 51 size_t length; | |
| 52 | |
| 53 ngx_uint_t width; | |
| 54 ngx_uint_t height; | |
| 55 | |
| 56 ngx_uint_t phase; | |
| 57 ngx_uint_t type; | |
| 58 } ngx_http_image_filter_ctx_t; | |
| 59 | |
| 60 | |
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61 static ngx_int_t ngx_http_image_send(ngx_http_request_t *r, |
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62 ngx_http_image_filter_ctx_t *ctx, ngx_chain_t *in); |
| 2788 | 63 static ngx_uint_t ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in); |
| 64 static ngx_int_t ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in); | |
| 65 static ngx_buf_t *ngx_http_image_process(ngx_http_request_t *r); | |
| 66 static ngx_buf_t *ngx_http_image_json(ngx_http_request_t *r, | |
| 67 ngx_http_image_filter_ctx_t *ctx); | |
| 68 static ngx_buf_t *ngx_http_image_asis(ngx_http_request_t *r, | |
| 69 ngx_http_image_filter_ctx_t *ctx); | |
| 70 static void ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b); | |
| 71 static ngx_int_t ngx_http_image_size(ngx_http_request_t *r, | |
| 72 ngx_http_image_filter_ctx_t *ctx); | |
| 73 | |
| 74 static ngx_buf_t *ngx_http_image_resize(ngx_http_request_t *r, | |
| 75 ngx_http_image_filter_ctx_t *ctx); | |
| 76 static gdImagePtr ngx_http_image_source(ngx_http_request_t *r, | |
| 77 ngx_http_image_filter_ctx_t *ctx); | |
| 78 static gdImagePtr ngx_http_image_new(ngx_http_request_t *r, int w, int h, | |
| 79 int colors); | |
| 80 static u_char *ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, | |
| 81 gdImagePtr img, int *size); | |
| 82 static void ngx_http_image_cleanup(void *data); | |
| 83 | |
| 84 | |
| 85 static void *ngx_http_image_filter_create_conf(ngx_conf_t *cf); | |
| 86 static char *ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, | |
| 87 void *child); | |
| 88 static char *ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 89 void *conf); | |
| 90 static ngx_int_t ngx_http_image_filter_init(ngx_conf_t *cf); | |
| 91 | |
| 92 | |
| 93 static ngx_command_t ngx_http_image_filter_commands[] = { | |
| 94 | |
| 95 { ngx_string("image_filter"), | |
| 96 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE13, | |
| 97 ngx_http_image_filter, | |
| 98 NGX_HTTP_LOC_CONF_OFFSET, | |
| 99 0, | |
| 100 NULL }, | |
| 101 | |
| 2848 | 102 { ngx_string("image_filter_jpeg_quality"), |
| 103 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 104 ngx_conf_set_num_slot, | |
| 105 NGX_HTTP_LOC_CONF_OFFSET, | |
| 106 offsetof(ngx_http_image_filter_conf_t, jpeg_quality), | |
| 107 NULL }, | |
| 108 | |
| 2788 | 109 { ngx_string("image_filter_buffer"), |
| 110 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 111 ngx_conf_set_size_slot, | |
| 112 NGX_HTTP_LOC_CONF_OFFSET, | |
| 113 offsetof(ngx_http_image_filter_conf_t, buffer_size), | |
| 114 NULL }, | |
| 115 | |
| 116 ngx_null_command | |
| 117 }; | |
| 118 | |
| 119 | |
| 120 static ngx_http_module_t ngx_http_image_filter_module_ctx = { | |
| 121 NULL, /* preconfiguration */ | |
| 122 ngx_http_image_filter_init, /* postconfiguration */ | |
| 123 | |
| 124 NULL, /* create main configuration */ | |
| 125 NULL, /* init main configuration */ | |
| 126 | |
| 127 NULL, /* create server configuration */ | |
| 128 NULL, /* merge server configuration */ | |
| 129 | |
| 130 ngx_http_image_filter_create_conf, /* create location configuration */ | |
| 131 ngx_http_image_filter_merge_conf /* merge location configuration */ | |
| 132 }; | |
| 133 | |
| 134 | |
| 135 ngx_module_t ngx_http_image_filter_module = { | |
| 136 NGX_MODULE_V1, | |
| 137 &ngx_http_image_filter_module_ctx, /* module context */ | |
| 138 ngx_http_image_filter_commands, /* module directives */ | |
| 139 NGX_HTTP_MODULE, /* module type */ | |
| 140 NULL, /* init master */ | |
| 141 NULL, /* init module */ | |
| 142 NULL, /* init process */ | |
| 143 NULL, /* init thread */ | |
| 144 NULL, /* exit thread */ | |
| 145 NULL, /* exit process */ | |
| 146 NULL, /* exit master */ | |
| 147 NGX_MODULE_V1_PADDING | |
| 148 }; | |
| 149 | |
| 150 | |
| 151 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
| 152 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
| 153 | |
| 154 | |
| 155 static ngx_str_t ngx_http_image_types[] = { | |
| 156 ngx_string("image/jpeg"), | |
| 157 ngx_string("image/gif"), | |
| 158 ngx_string("image/png") | |
| 159 }; | |
| 160 | |
| 161 | |
| 162 static ngx_int_t | |
| 163 ngx_http_image_header_filter(ngx_http_request_t *r) | |
| 164 { | |
| 165 off_t len; | |
| 166 ngx_http_image_filter_ctx_t *ctx; | |
| 167 ngx_http_image_filter_conf_t *conf; | |
| 168 | |
| 169 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) { | |
| 170 return ngx_http_next_header_filter(r); | |
| 171 } | |
| 172 | |
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173 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); |
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174 |
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175 if (ctx) { |
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176 ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module); |
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177 return ngx_http_next_header_filter(r); |
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178 } |
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179 |
| 2788 | 180 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); |
| 181 | |
| 182 if (conf->filter == NGX_HTTP_IMAGE_OFF) { | |
| 183 return ngx_http_next_header_filter(r); | |
| 184 } | |
| 185 | |
| 186 if (r->headers_out.content_type.len | |
| 187 >= sizeof("multipart/x-mixed-replace") - 1 | |
| 188 && ngx_strncasecmp(r->headers_out.content_type.data, | |
| 189 (u_char *) "multipart/x-mixed-replace", | |
| 190 sizeof("multipart/x-mixed-replace") - 1) | |
| 191 == 0) | |
| 192 { | |
| 193 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 194 "image filter: multipart/x-mixed-replace response"); | |
| 195 | |
| 196 return NGX_ERROR; | |
| 197 } | |
| 198 | |
| 199 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t)); | |
| 200 if (ctx == NULL) { | |
| 201 return NGX_ERROR; | |
| 202 } | |
| 203 | |
| 204 ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module); | |
| 205 | |
| 206 len = r->headers_out.content_length_n; | |
| 207 | |
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208 if (len != -1 && len > (off_t) conf->buffer_size) { |
| 2788 | 209 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| 210 "image filter: too big response: %O", len); | |
| 211 | |
| 212 return NGX_ERROR; | |
| 213 } | |
| 214 | |
| 215 if (len == -1) { | |
| 216 ctx->length = conf->buffer_size; | |
| 217 | |
| 218 } else { | |
| 219 ctx->length = (size_t) len; | |
| 220 } | |
| 221 | |
| 222 if (r->headers_out.refresh) { | |
| 223 r->headers_out.refresh->hash = 0; | |
| 224 } | |
| 225 | |
| 226 r->main_filter_need_in_memory = 1; | |
| 227 r->allow_ranges = 0; | |
| 228 | |
| 229 return NGX_OK; | |
| 230 } | |
| 231 | |
| 232 | |
| 233 static ngx_int_t | |
| 234 ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 235 { | |
| 236 ngx_int_t rc; | |
| 237 ngx_str_t *ct; | |
| 238 ngx_chain_t out; | |
| 239 ngx_http_image_filter_ctx_t *ctx; | |
| 240 ngx_http_image_filter_conf_t *conf; | |
| 241 | |
| 242 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter"); | |
| 243 | |
| 244 if (in == NULL) { | |
| 245 return ngx_http_next_body_filter(r, in); | |
| 246 } | |
| 247 | |
| 248 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 249 | |
| 250 if (ctx == NULL) { | |
| 251 return ngx_http_next_body_filter(r, in); | |
| 252 } | |
| 253 | |
| 254 switch (ctx->phase) { | |
| 255 | |
| 256 case NGX_HTTP_IMAGE_START: | |
| 257 | |
| 258 ctx->type = ngx_http_image_test(r, in); | |
| 259 | |
| 260 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 261 | |
| 262 if (ctx->type == NGX_HTTP_IMAGE_NONE) { | |
| 263 | |
| 264 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 265 out.buf = ngx_http_image_json(r, NULL); | |
| 266 | |
| 267 if (out.buf) { | |
| 268 out.next = NULL; | |
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269 ctx->phase = NGX_HTTP_IMAGE_DONE; |
| 2788 | 270 |
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271 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 272 } |
| 273 } | |
| 274 | |
| 275 return ngx_http_filter_finalize_request(r, | |
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276 &ngx_http_image_filter_module, |
| 2788 | 277 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 278 } | |
| 279 | |
| 280 /* override content type */ | |
| 281 | |
| 282 ct = &ngx_http_image_types[ctx->type - 1]; | |
| 283 r->headers_out.content_type_len = ct->len; | |
| 284 r->headers_out.content_type = *ct; | |
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285 r->headers_out.content_type_lowcase = NULL; |
| 2788 | 286 |
| 287 if (conf->filter == NGX_HTTP_IMAGE_TEST) { | |
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288 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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289 |
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290 return ngx_http_image_send(r, ctx, in); |
| 2788 | 291 } |
| 292 | |
| 293 ctx->phase = NGX_HTTP_IMAGE_READ; | |
| 294 | |
| 295 /* fall through */ | |
| 296 | |
| 297 case NGX_HTTP_IMAGE_READ: | |
| 298 | |
| 299 rc = ngx_http_image_read(r, in); | |
| 300 | |
| 301 if (rc == NGX_AGAIN) { | |
| 302 return NGX_OK; | |
| 303 } | |
| 304 | |
| 305 if (rc == NGX_ERROR) { | |
| 306 return ngx_http_filter_finalize_request(r, | |
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307 &ngx_http_image_filter_module, |
| 2788 | 308 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 309 } | |
| 310 | |
| 311 /* fall through */ | |
| 312 | |
| 313 case NGX_HTTP_IMAGE_PROCESS: | |
| 314 | |
| 315 out.buf = ngx_http_image_process(r); | |
| 316 | |
| 317 if (out.buf == NULL) { | |
| 318 return ngx_http_filter_finalize_request(r, | |
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319 &ngx_http_image_filter_module, |
| 2788 | 320 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 321 } | |
| 322 | |
| 323 out.next = NULL; | |
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324 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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325 |
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326 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 327 |
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328 case NGX_HTTP_IMAGE_PASS: |
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329 |
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330 return ngx_http_next_body_filter(r, in); |
| 2788 | 331 |
| 332 default: /* NGX_HTTP_IMAGE_DONE */ | |
| 333 | |
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334 rc = ngx_http_next_body_filter(r, NULL); |
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335 |
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336 /* NGX_ERROR resets any pending data */ |
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337 return (rc == NGX_OK) ? NGX_ERROR : rc; |
| 2788 | 338 } |
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339 } |
| 2788 | 340 |
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341 |
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342 static ngx_int_t |
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343 ngx_http_image_send(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx, |
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344 ngx_chain_t *in) |
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345 { |
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346 ngx_int_t rc; |
| 2788 | 347 |
| 348 rc = ngx_http_next_header_filter(r); | |
| 349 | |
| 350 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
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351 return NGX_ERROR; |
| 2788 | 352 } |
| 353 | |
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354 rc = ngx_http_next_body_filter(r, in); |
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355 |
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356 if (ctx->phase == NGX_HTTP_IMAGE_DONE) { |
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357 /* NGX_ERROR resets any pending data */ |
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358 return (rc == NGX_OK) ? NGX_ERROR : rc; |
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359 } |
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360 |
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361 return rc; |
| 2788 | 362 } |
| 363 | |
| 364 | |
| 365 static ngx_uint_t | |
| 366 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in) | |
| 367 { | |
| 368 u_char *p; | |
| 369 | |
| 370 p = in->buf->pos; | |
| 371 | |
| 372 if (in->buf->last - p < 16) { | |
| 373 return NGX_HTTP_IMAGE_NONE; | |
| 374 } | |
| 375 | |
| 376 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 377 "image filter: \"%c%c\"", p[0], p[1]); | |
| 378 | |
| 379 if (p[0] == 0xff && p[1] == 0xd8) { | |
| 380 | |
| 381 /* JPEG */ | |
| 382 | |
| 383 return NGX_HTTP_IMAGE_JPEG; | |
| 384 | |
| 385 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8' | |
| 386 && p[4] == '9' && p[5] == 'a') | |
| 387 { | |
| 388 /* GIF */ | |
| 389 | |
| 390 return NGX_HTTP_IMAGE_GIF; | |
| 391 | |
| 392 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G' | |
| 393 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a) | |
| 394 { | |
| 395 /* PNG */ | |
| 396 | |
| 397 return NGX_HTTP_IMAGE_PNG; | |
| 398 } | |
| 399 | |
| 400 return NGX_HTTP_IMAGE_NONE; | |
| 401 } | |
| 402 | |
| 403 | |
| 404 static ngx_int_t | |
| 405 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in) | |
| 406 { | |
| 407 u_char *p; | |
| 408 size_t size, rest; | |
| 409 ngx_buf_t *b; | |
| 410 ngx_chain_t *cl; | |
| 411 ngx_http_image_filter_ctx_t *ctx; | |
| 412 | |
| 413 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 414 | |
| 415 if (ctx->image == NULL) { | |
| 416 ctx->image = ngx_palloc(r->pool, ctx->length); | |
| 417 if (ctx->image == NULL) { | |
| 418 return NGX_ERROR; | |
| 419 } | |
| 420 | |
| 421 ctx->last = ctx->image; | |
| 422 } | |
| 423 | |
| 424 p = ctx->last; | |
| 425 | |
| 426 for (cl = in; cl; cl = cl->next) { | |
| 427 | |
| 428 b = cl->buf; | |
| 429 size = b->last - b->pos; | |
| 430 | |
| 431 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 432 "image buf: %uz", size); | |
| 433 | |
| 434 rest = ctx->image + ctx->length - p; | |
| 435 size = (rest < size) ? rest : size; | |
| 436 | |
| 437 p = ngx_cpymem(p, b->pos, size); | |
| 438 b->pos += size; | |
| 439 | |
| 440 if (b->last_buf) { | |
| 441 ctx->last = p; | |
| 442 return NGX_OK; | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 ctx->last = p; | |
| 447 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED; | |
| 448 | |
| 449 return NGX_AGAIN; | |
| 450 } | |
| 451 | |
| 452 | |
| 453 static ngx_buf_t * | |
| 454 ngx_http_image_process(ngx_http_request_t *r) | |
| 455 { | |
| 456 ngx_buf_t *b; | |
| 457 ngx_int_t rc; | |
| 458 ngx_http_image_filter_ctx_t *ctx; | |
| 459 ngx_http_image_filter_conf_t *conf; | |
| 460 | |
| 461 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED; | |
| 462 | |
| 463 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 464 | |
| 465 rc = ngx_http_image_size(r, ctx); | |
| 466 | |
| 467 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 468 | |
| 469 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 470 | |
| 471 b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL); | |
| 472 | |
| 473 } else if (rc == NGX_OK | |
| 474 && ctx->width <= conf->width | |
| 475 && ctx->height <= conf->height) | |
| 476 { | |
| 477 b = ngx_http_image_asis(r, ctx); | |
| 478 | |
| 479 } else { | |
| 480 b = ngx_http_image_resize(r, ctx); | |
| 481 } | |
| 482 | |
| 483 return b; | |
| 484 } | |
| 485 | |
| 486 | |
| 487 static ngx_buf_t * | |
| 488 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 489 { | |
| 490 size_t len; | |
| 491 ngx_buf_t *b; | |
| 492 | |
| 493 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 494 if (b == NULL) { | |
| 495 return NULL; | |
| 496 } | |
| 497 | |
| 498 b->memory = 1; | |
| 499 b->last_buf = 1; | |
| 500 | |
| 501 ngx_http_clean_header(r); | |
| 502 | |
| 503 r->headers_out.status = NGX_HTTP_OK; | |
| 504 r->headers_out.content_type.len = sizeof("text/plain") - 1; | |
| 505 r->headers_out.content_type.data = (u_char *) "text/plain"; | |
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506 r->headers_out.content_type_lowcase = NULL; |
| 2788 | 507 |
| 508 if (ctx == NULL) { | |
| 509 b->pos = (u_char *) "{}" CRLF; | |
| 510 b->last = b->pos + sizeof("{}" CRLF) - 1; | |
| 511 | |
| 512 ngx_http_image_length(r, b); | |
| 513 | |
| 514 return b; | |
| 515 } | |
| 516 | |
| 517 len = sizeof("{ \"img\" : " | |
| 518 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1 | |
| 519 + 2 * NGX_SIZE_T_LEN; | |
| 520 | |
| 521 b->pos = ngx_pnalloc(r->pool, len); | |
| 522 if (b->pos == NULL) { | |
| 523 return NULL; | |
| 524 } | |
| 525 | |
| 526 b->last = ngx_sprintf(b->pos, | |
| 527 "{ \"img\" : " | |
| 528 "{ \"width\": %uz," | |
| 529 " \"height\": %uz," | |
| 530 " \"type\": \"%s\" } }" CRLF, | |
| 531 ctx->width, ctx->height, | |
| 532 ngx_http_image_types[ctx->type - 1].data + 6); | |
| 533 | |
| 534 ngx_http_image_length(r, b); | |
| 535 | |
| 536 return b; | |
| 537 } | |
| 538 | |
| 539 | |
| 540 static ngx_buf_t * | |
| 541 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 542 { | |
| 543 ngx_buf_t *b; | |
| 544 | |
| 545 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 546 if (b == NULL) { | |
| 547 return NULL; | |
| 548 } | |
| 549 | |
| 550 b->pos = ctx->image; | |
| 551 b->last = ctx->last; | |
| 552 b->memory = 1; | |
| 553 b->last_buf = 1; | |
| 554 | |
| 555 ngx_http_image_length(r, b); | |
| 556 | |
| 557 return b; | |
| 558 } | |
| 559 | |
| 560 | |
| 561 static void | |
| 562 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b) | |
| 563 { | |
| 564 r->headers_out.content_length_n = b->last - b->pos; | |
| 565 | |
| 566 if (r->headers_out.content_length) { | |
| 567 r->headers_out.content_length->hash = 0; | |
| 568 } | |
| 569 | |
| 570 r->headers_out.content_length = NULL; | |
| 571 } | |
| 572 | |
| 573 | |
| 574 static ngx_int_t | |
| 575 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 576 { | |
| 577 u_char *p, *last; | |
| 578 ngx_uint_t width, height; | |
| 579 | |
| 580 p = ctx->image; | |
| 581 | |
| 582 switch (ctx->type) { | |
| 583 | |
| 584 case NGX_HTTP_IMAGE_JPEG: | |
| 585 | |
| 586 p += 2; | |
| 587 last = ctx->image + ctx->length - 10; | |
| 588 | |
| 589 while (p < last) { | |
| 590 | |
| 591 if (p[0] == 0xff && p[1] != 0xff) { | |
| 592 | |
| 593 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 594 "JPEG: %02xd %02xd", *p, *(p + 1)); | |
| 595 | |
| 596 p++; | |
| 597 | |
| 598 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3 | |
| 599 || *p == 0xc9 || *p == 0xca || *p == 0xcb) | |
| 600 { | |
| 601 goto found; | |
| 602 } | |
| 603 | |
| 604 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 605 "JPEG: %02xd %02xd", p[1], p[2]); | |
| 606 | |
| 607 p += p[1] * 256 + p[2]; | |
| 608 | |
| 609 continue; | |
| 610 } | |
| 611 | |
| 612 p++; | |
| 613 } | |
| 614 | |
| 615 return NGX_DECLINED; | |
| 616 | |
| 617 found: | |
| 618 | |
| 619 width = p[6] * 256 + p[7]; | |
| 620 height = p[4] * 256 + p[5]; | |
| 621 | |
| 622 break; | |
| 623 | |
| 624 case NGX_HTTP_IMAGE_GIF: | |
| 625 | |
| 626 if (ctx->length < 10) { | |
| 627 return NGX_DECLINED; | |
| 628 } | |
| 629 | |
| 630 width = p[7] * 256 + p[6]; | |
| 631 height = p[9] * 256 + p[8]; | |
| 632 | |
| 633 break; | |
| 634 | |
| 635 case NGX_HTTP_IMAGE_PNG: | |
| 636 | |
| 637 if (ctx->length < 24) { | |
| 638 return NGX_DECLINED; | |
| 639 } | |
| 640 | |
| 641 width = p[18] * 256 + p[19]; | |
| 642 height = p[22] * 256 + p[23]; | |
| 643 | |
| 644 break; | |
| 645 | |
| 646 default: | |
| 647 | |
| 648 return NGX_DECLINED; | |
| 649 } | |
| 650 | |
| 651 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 652 "image size: %d x %d", width, height); | |
| 653 | |
| 654 ctx->width = width; | |
| 655 ctx->height = height; | |
| 656 | |
| 657 return NGX_OK; | |
| 658 } | |
| 659 | |
| 660 | |
| 661 static ngx_buf_t * | |
| 662 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 663 { | |
| 664 int sx, sy, dx, dy, ox, oy, | |
| 665 colors, transparent, size; | |
| 666 u_char *out; | |
| 667 ngx_buf_t *b; | |
| 668 ngx_uint_t resize; | |
| 669 gdImagePtr src, dst; | |
| 670 ngx_pool_cleanup_t *cln; | |
| 671 ngx_http_image_filter_conf_t *conf; | |
| 672 | |
| 673 src = ngx_http_image_source(r, ctx); | |
| 674 | |
| 675 if (src == NULL) { | |
| 676 return NULL; | |
| 677 } | |
| 678 | |
| 679 sx = gdImageSX(src); | |
| 680 sy = gdImageSY(src); | |
| 681 | |
| 682 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 683 | |
| 684 if ((ngx_uint_t) sx <= conf->width && (ngx_uint_t) sy <= conf->height) { | |
| 685 gdImageDestroy(src); | |
| 686 return ngx_http_image_asis(r, ctx); | |
| 687 } | |
| 688 | |
| 689 colors = gdImageColorsTotal(src); | |
| 690 transparent = gdImageGetTransparent(src); | |
| 691 | |
| 692 dx = sx; | |
| 693 dy = sy; | |
| 694 | |
| 695 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { | |
| 696 | |
| 697 if ((ngx_uint_t) dx > conf->width) { | |
| 698 dy = dy * conf->width / dx; | |
| 699 dy = dy ? dy : 1; | |
| 700 dx = conf->width; | |
| 701 } | |
| 702 | |
| 703 if ((ngx_uint_t) dy > conf->height) { | |
| 704 dx = dx * conf->height / dy; | |
| 705 dx = dx ? dx : 1; | |
| 706 dy = conf->height; | |
| 707 } | |
| 708 | |
| 709 resize = 1; | |
| 710 | |
| 711 } else { /* NGX_HTTP_IMAGE_CROP */ | |
| 712 | |
| 713 resize = 0; | |
| 714 | |
| 715 if ((ngx_uint_t) (dx * 100 / dy) < conf->width * 100 / conf->height) { | |
| 716 | |
| 717 if ((ngx_uint_t) dx > conf->width) { | |
| 718 dy = dy * conf->width / dx; | |
| 719 dy = dy ? dy : 1; | |
| 720 dx = conf->width; | |
| 721 resize = 1; | |
| 722 } | |
| 723 | |
| 724 } else { | |
| 725 if ((ngx_uint_t) dy > conf->height) { | |
| 726 dx = dx * conf->height / dy; | |
| 727 dx = dx ? dx : 1; | |
| 728 dy = conf->height; | |
| 729 resize = 1; | |
| 730 } | |
| 731 } | |
| 732 } | |
| 733 | |
| 734 if (resize) { | |
| 735 dst = ngx_http_image_new(r, dx, dy, colors); | |
| 736 if (dst == NULL) { | |
| 737 gdImageDestroy(src); | |
| 738 return NULL; | |
| 739 } | |
| 740 | |
| 741 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); | |
| 742 | |
| 743 gdImageDestroy(src); | |
| 744 | |
| 745 } else { | |
| 746 dst = src; | |
| 747 } | |
| 748 | |
| 749 if (conf->filter == NGX_HTTP_IMAGE_CROP) { | |
| 750 | |
| 751 src = dst; | |
| 752 | |
| 753 if ((ngx_uint_t) dx > conf->width) { | |
| 754 ox = dx - conf->width; | |
| 755 | |
| 756 } else { | |
| 757 ox = 0; | |
| 758 } | |
| 759 | |
| 760 if ((ngx_uint_t) dy > conf->height) { | |
| 761 oy = dy - conf->height; | |
| 762 | |
| 763 } else { | |
| 764 oy = 0; | |
| 765 } | |
| 766 | |
| 767 if (ox || oy) { | |
| 768 | |
| 769 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors); | |
| 770 | |
| 771 if (dst == NULL) { | |
| 772 gdImageDestroy(src); | |
| 773 return NULL; | |
| 774 } | |
| 775 | |
| 776 ox /= 2; | |
| 777 oy /= 2; | |
| 778 | |
| 779 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 780 "image crop: %d x %d @ %d x %d", | |
| 781 dx, dy, ox, oy); | |
| 782 | |
| 783 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); | |
| 784 | |
| 785 gdImageDestroy(src); | |
| 786 } | |
| 787 } | |
| 788 | |
| 789 gdImageColorTransparent(dst, transparent); | |
| 790 | |
| 791 out = ngx_http_image_out(r, ctx->type, dst, &size); | |
| 792 | |
| 793 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 794 "image: %d x %d %d", sx, sy, colors); | |
| 795 | |
| 796 gdImageDestroy(dst); | |
| 797 ngx_pfree(r->pool, ctx->image); | |
| 798 | |
| 799 if (out == NULL) { | |
| 800 return NULL; | |
| 801 } | |
| 802 | |
| 803 cln = ngx_pool_cleanup_add(r->pool, 0); | |
| 804 if (cln == NULL) { | |
| 805 gdFree(out); | |
| 806 return NULL; | |
| 807 } | |
| 808 | |
| 809 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 810 if (b == NULL) { | |
| 811 gdFree(out); | |
| 812 return NULL; | |
| 813 } | |
| 814 | |
| 815 cln->handler = ngx_http_image_cleanup; | |
| 816 cln->data = out; | |
| 817 | |
| 818 b->pos = out; | |
| 819 b->last = out + size; | |
| 820 b->memory = 1; | |
| 821 b->last_buf = 1; | |
| 822 | |
| 823 ngx_http_image_length(r, b); | |
| 824 | |
| 825 return b; | |
| 826 } | |
| 827 | |
| 828 | |
| 829 static gdImagePtr | |
| 830 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 831 { | |
| 832 char *failed; | |
| 833 gdImagePtr img; | |
| 834 | |
| 835 img = NULL; | |
| 836 | |
| 837 switch (ctx->type) { | |
| 838 | |
| 839 case NGX_HTTP_IMAGE_JPEG: | |
| 840 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image); | |
| 841 failed = "gdImageCreateFromJpegPtr() failed"; | |
| 842 break; | |
| 843 | |
| 844 case NGX_HTTP_IMAGE_GIF: | |
| 845 img = gdImageCreateFromGifPtr(ctx->length, ctx->image); | |
| 846 failed = "gdImageCreateFromGifPtr() failed"; | |
| 847 break; | |
| 848 | |
| 849 case NGX_HTTP_IMAGE_PNG: | |
| 850 img = gdImageCreateFromPngPtr(ctx->length, ctx->image); | |
| 851 failed = "gdImageCreateFromPngPtr() failed"; | |
| 852 break; | |
| 853 | |
| 854 default: | |
| 855 failed = "unknown image type"; | |
| 856 break; | |
| 857 } | |
| 858 | |
| 859 if (img == NULL) { | |
| 860 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 861 } | |
| 862 | |
| 863 return img; | |
| 864 } | |
| 865 | |
| 866 | |
| 867 static gdImagePtr | |
| 868 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors) | |
| 869 { | |
| 870 gdImagePtr img; | |
| 871 | |
| 872 if (colors == 0) { | |
| 873 img = gdImageCreateTrueColor(w, h); | |
| 874 | |
| 875 if (img == NULL) { | |
| 876 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 877 "gdImageCreateTrueColor() failed"); | |
| 878 return NULL; | |
| 879 } | |
| 880 | |
| 881 } else { | |
| 882 img = gdImageCreate(w, h); | |
| 883 | |
| 884 if (img == NULL) { | |
| 885 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 886 "gdImageCreate() failed"); | |
| 887 return NULL; | |
| 888 } | |
| 889 } | |
| 890 | |
| 891 return img; | |
| 892 } | |
| 893 | |
| 894 | |
| 895 static u_char * | |
| 896 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img, | |
| 897 int *size) | |
| 898 { | |
| 2848 | 899 char *failed; |
| 900 u_char *out; | |
| 901 ngx_http_image_filter_conf_t *conf; | |
| 2788 | 902 |
| 903 out = NULL; | |
| 904 | |
| 905 switch (type) { | |
| 906 | |
| 907 case NGX_HTTP_IMAGE_JPEG: | |
| 2848 | 908 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); |
| 909 out = gdImageJpegPtr(img, size, conf->jpeg_quality); | |
| 2788 | 910 failed = "gdImageJpegPtr() failed"; |
| 911 break; | |
| 912 | |
| 913 case NGX_HTTP_IMAGE_GIF: | |
| 914 out = gdImageGifPtr(img, size); | |
| 915 failed = "gdImageGifPtr() failed"; | |
| 916 break; | |
| 917 | |
| 918 case NGX_HTTP_IMAGE_PNG: | |
| 919 out = gdImagePngPtr(img, size); | |
| 920 failed = "gdImagePngPtr() failed"; | |
| 921 break; | |
| 922 | |
| 923 default: | |
| 924 failed = "unknown image type"; | |
| 925 break; | |
| 926 } | |
| 927 | |
| 928 if (out == NULL) { | |
| 929 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 930 } | |
| 931 | |
| 932 return out; | |
| 933 } | |
| 934 | |
| 935 | |
| 936 static void | |
| 937 ngx_http_image_cleanup(void *data) | |
| 938 { | |
| 939 gdFree(data); | |
| 940 } | |
| 941 | |
| 942 | |
| 943 static void * | |
| 944 ngx_http_image_filter_create_conf(ngx_conf_t *cf) | |
| 945 { | |
| 946 ngx_http_image_filter_conf_t *conf; | |
| 947 | |
| 948 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t)); | |
| 949 if (conf == NULL) { | |
|
2912
c7d57b539248
return NULL instead of NGX_CONF_ERROR on a create conf failure
Igor Sysoev <igor@sysoev.ru>
parents:
2882
diff
changeset
|
950 return NULL; |
| 2788 | 951 } |
| 952 | |
| 953 conf->filter = NGX_CONF_UNSET_UINT; | |
| 2848 | 954 conf->jpeg_quality = NGX_CONF_UNSET; |
| 2788 | 955 conf->buffer_size = NGX_CONF_UNSET_SIZE; |
| 956 | |
| 957 return conf; | |
| 958 } | |
| 959 | |
| 960 | |
| 961 static char * | |
| 962 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 963 { | |
| 964 ngx_http_image_filter_conf_t *prev = parent; | |
| 965 ngx_http_image_filter_conf_t *conf = child; | |
| 966 | |
| 967 if (conf->filter == NGX_CONF_UNSET_UINT) { | |
| 968 | |
| 969 if (prev->filter == NGX_CONF_UNSET_UINT) { | |
| 970 conf->filter = NGX_HTTP_IMAGE_OFF; | |
| 971 | |
| 972 } else { | |
| 973 conf->filter = prev->filter; | |
| 974 conf->width = prev->width; | |
| 975 conf->height = prev->height; | |
| 976 } | |
| 977 } | |
| 978 | |
| 2848 | 979 /* 75 is libjpeg default quality */ |
| 980 ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75); | |
| 981 | |
| 2788 | 982 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, |
| 983 1 * 1024 * 1024); | |
| 984 | |
| 985 return NGX_CONF_OK; | |
| 986 } | |
| 987 | |
| 988 | |
| 989 static char * | |
| 990 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 991 { | |
| 992 ngx_http_image_filter_conf_t *imcf = conf; | |
| 993 | |
| 994 ngx_str_t *value; | |
| 995 ngx_int_t n; | |
| 996 ngx_uint_t i; | |
| 997 | |
| 998 value = cf->args->elts; | |
| 999 | |
| 1000 i = 1; | |
| 1001 | |
| 1002 if (cf->args->nelts == 2) { | |
| 1003 if (ngx_strcmp(value[i].data, "off") == 0) { | |
| 1004 imcf->filter = NGX_HTTP_IMAGE_OFF; | |
| 1005 | |
| 1006 } else if (ngx_strcmp(value[i].data, "test") == 0) { | |
| 1007 imcf->filter = NGX_HTTP_IMAGE_TEST; | |
| 1008 | |
| 1009 } else if (ngx_strcmp(value[i].data, "size") == 0) { | |
| 1010 imcf->filter = NGX_HTTP_IMAGE_SIZE; | |
| 1011 | |
| 1012 } else { | |
| 1013 goto failed; | |
| 1014 } | |
| 1015 | |
| 1016 return NGX_CONF_OK; | |
| 1017 } | |
| 1018 | |
| 1019 if (ngx_strcmp(value[i].data, "resize") == 0) { | |
| 1020 imcf->filter = NGX_HTTP_IMAGE_RESIZE; | |
| 1021 | |
| 1022 } else if (ngx_strcmp(value[i].data, "crop") == 0) { | |
| 1023 imcf->filter = NGX_HTTP_IMAGE_CROP; | |
| 1024 | |
| 1025 } else { | |
| 1026 goto failed; | |
| 1027 } | |
| 1028 | |
| 1029 i++; | |
| 1030 | |
| 1031 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1032 imcf->width = (ngx_uint_t) -1; | |
| 1033 | |
| 1034 } else { | |
| 1035 n = ngx_atoi(value[i].data, value[i].len); | |
| 1036 if (n == NGX_ERROR) { | |
| 1037 goto failed; | |
| 1038 } | |
| 1039 | |
| 1040 imcf->width = (ngx_uint_t) n; | |
| 1041 } | |
| 1042 | |
| 1043 i++; | |
| 1044 | |
| 1045 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1046 imcf->height = (ngx_uint_t) -1; | |
| 1047 | |
| 1048 } else { | |
| 1049 n = ngx_atoi(value[i].data, value[i].len); | |
| 1050 if (n == NGX_ERROR) { | |
| 1051 goto failed; | |
| 1052 } | |
| 1053 | |
| 1054 imcf->height = (ngx_uint_t) n; | |
| 1055 } | |
| 1056 | |
| 1057 return NGX_CONF_OK; | |
| 1058 | |
| 1059 failed: | |
| 1060 | |
| 1061 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", | |
| 1062 &value[i]); | |
| 1063 | |
| 1064 return NGX_CONF_ERROR; | |
| 1065 } | |
| 1066 | |
| 1067 | |
| 1068 static ngx_int_t | |
| 1069 ngx_http_image_filter_init(ngx_conf_t *cf) | |
| 1070 { | |
| 1071 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 1072 ngx_http_top_header_filter = ngx_http_image_header_filter; | |
| 1073 | |
| 1074 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 1075 ngx_http_top_body_filter = ngx_http_image_body_filter; | |
| 1076 | |
| 1077 return NGX_OK; | |
| 1078 } |