Mercurial > hg > nginx
annotate src/http/modules/ngx_http_image_filter_module.c @ 2819:43fe53832da7
handle big responses for "size" and "test" image_filters
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Fri, 08 May 2009 14:25:51 +0000 |
| parents | d82d08314f78 |
| children | 26e06e009ced |
| 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; | |
| 41 | |
| 42 size_t buffer_size; | |
| 43 } ngx_http_image_filter_conf_t; | |
| 44 | |
| 45 | |
| 46 typedef struct { | |
| 47 u_char *image; | |
| 48 u_char *last; | |
| 49 | |
| 50 size_t length; | |
| 51 | |
| 52 ngx_uint_t width; | |
| 53 ngx_uint_t height; | |
| 54 | |
| 55 ngx_uint_t phase; | |
| 56 ngx_uint_t type; | |
| 57 } ngx_http_image_filter_ctx_t; | |
| 58 | |
| 59 | |
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60 static ngx_int_t ngx_http_image_send(ngx_http_request_t *r, |
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61 ngx_http_image_filter_ctx_t *ctx, ngx_chain_t *in); |
| 2788 | 62 static ngx_uint_t ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in); |
| 63 static ngx_int_t ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in); | |
| 64 static ngx_buf_t *ngx_http_image_process(ngx_http_request_t *r); | |
| 65 static ngx_buf_t *ngx_http_image_json(ngx_http_request_t *r, | |
| 66 ngx_http_image_filter_ctx_t *ctx); | |
| 67 static ngx_buf_t *ngx_http_image_asis(ngx_http_request_t *r, | |
| 68 ngx_http_image_filter_ctx_t *ctx); | |
| 69 static void ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b); | |
| 70 static ngx_int_t ngx_http_image_size(ngx_http_request_t *r, | |
| 71 ngx_http_image_filter_ctx_t *ctx); | |
| 72 | |
| 73 static ngx_buf_t *ngx_http_image_resize(ngx_http_request_t *r, | |
| 74 ngx_http_image_filter_ctx_t *ctx); | |
| 75 static gdImagePtr ngx_http_image_source(ngx_http_request_t *r, | |
| 76 ngx_http_image_filter_ctx_t *ctx); | |
| 77 static gdImagePtr ngx_http_image_new(ngx_http_request_t *r, int w, int h, | |
| 78 int colors); | |
| 79 static u_char *ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, | |
| 80 gdImagePtr img, int *size); | |
| 81 static void ngx_http_image_cleanup(void *data); | |
| 82 | |
| 83 | |
| 84 static void *ngx_http_image_filter_create_conf(ngx_conf_t *cf); | |
| 85 static char *ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, | |
| 86 void *child); | |
| 87 static char *ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 88 void *conf); | |
| 89 static ngx_int_t ngx_http_image_filter_init(ngx_conf_t *cf); | |
| 90 | |
| 91 | |
| 92 static ngx_command_t ngx_http_image_filter_commands[] = { | |
| 93 | |
| 94 { ngx_string("image_filter"), | |
| 95 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE13, | |
| 96 ngx_http_image_filter, | |
| 97 NGX_HTTP_LOC_CONF_OFFSET, | |
| 98 0, | |
| 99 NULL }, | |
| 100 | |
| 101 { ngx_string("image_filter_buffer"), | |
| 102 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 103 ngx_conf_set_size_slot, | |
| 104 NGX_HTTP_LOC_CONF_OFFSET, | |
| 105 offsetof(ngx_http_image_filter_conf_t, buffer_size), | |
| 106 NULL }, | |
| 107 | |
| 108 ngx_null_command | |
| 109 }; | |
| 110 | |
| 111 | |
| 112 static ngx_http_module_t ngx_http_image_filter_module_ctx = { | |
| 113 NULL, /* preconfiguration */ | |
| 114 ngx_http_image_filter_init, /* postconfiguration */ | |
| 115 | |
| 116 NULL, /* create main configuration */ | |
| 117 NULL, /* init main configuration */ | |
| 118 | |
| 119 NULL, /* create server configuration */ | |
| 120 NULL, /* merge server configuration */ | |
| 121 | |
| 122 ngx_http_image_filter_create_conf, /* create location configuration */ | |
| 123 ngx_http_image_filter_merge_conf /* merge location configuration */ | |
| 124 }; | |
| 125 | |
| 126 | |
| 127 ngx_module_t ngx_http_image_filter_module = { | |
| 128 NGX_MODULE_V1, | |
| 129 &ngx_http_image_filter_module_ctx, /* module context */ | |
| 130 ngx_http_image_filter_commands, /* module directives */ | |
| 131 NGX_HTTP_MODULE, /* module type */ | |
| 132 NULL, /* init master */ | |
| 133 NULL, /* init module */ | |
| 134 NULL, /* init process */ | |
| 135 NULL, /* init thread */ | |
| 136 NULL, /* exit thread */ | |
| 137 NULL, /* exit process */ | |
| 138 NULL, /* exit master */ | |
| 139 NGX_MODULE_V1_PADDING | |
| 140 }; | |
| 141 | |
| 142 | |
| 143 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
| 144 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
| 145 | |
| 146 | |
| 147 static ngx_str_t ngx_http_image_types[] = { | |
| 148 ngx_string("image/jpeg"), | |
| 149 ngx_string("image/gif"), | |
| 150 ngx_string("image/png") | |
| 151 }; | |
| 152 | |
| 153 | |
| 154 static ngx_int_t | |
| 155 ngx_http_image_header_filter(ngx_http_request_t *r) | |
| 156 { | |
| 157 off_t len; | |
| 158 ngx_http_image_filter_ctx_t *ctx; | |
| 159 ngx_http_image_filter_conf_t *conf; | |
| 160 | |
| 161 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) { | |
| 162 return ngx_http_next_header_filter(r); | |
| 163 } | |
| 164 | |
| 165 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 166 | |
| 167 if (conf->filter == NGX_HTTP_IMAGE_OFF) { | |
| 168 return ngx_http_next_header_filter(r); | |
| 169 } | |
| 170 | |
| 171 if (r->headers_out.content_type.len | |
| 172 >= sizeof("multipart/x-mixed-replace") - 1 | |
| 173 && ngx_strncasecmp(r->headers_out.content_type.data, | |
| 174 (u_char *) "multipart/x-mixed-replace", | |
| 175 sizeof("multipart/x-mixed-replace") - 1) | |
| 176 == 0) | |
| 177 { | |
| 178 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 179 "image filter: multipart/x-mixed-replace response"); | |
| 180 | |
| 181 return NGX_ERROR; | |
| 182 } | |
| 183 | |
| 184 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t)); | |
| 185 if (ctx == NULL) { | |
| 186 return NGX_ERROR; | |
| 187 } | |
| 188 | |
| 189 ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module); | |
| 190 | |
| 191 len = r->headers_out.content_length_n; | |
| 192 | |
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193 if (len != -1 && len > (off_t) conf->buffer_size) { |
| 2788 | 194 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| 195 "image filter: too big response: %O", len); | |
| 196 | |
| 197 return NGX_ERROR; | |
| 198 } | |
| 199 | |
| 200 if (len == -1) { | |
| 201 ctx->length = conf->buffer_size; | |
| 202 | |
| 203 } else { | |
| 204 ctx->length = (size_t) len; | |
| 205 } | |
| 206 | |
| 207 if (r->headers_out.refresh) { | |
| 208 r->headers_out.refresh->hash = 0; | |
| 209 } | |
| 210 | |
| 211 r->main_filter_need_in_memory = 1; | |
| 212 r->allow_ranges = 0; | |
| 213 | |
| 214 return NGX_OK; | |
| 215 } | |
| 216 | |
| 217 | |
| 218 static ngx_int_t | |
| 219 ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 220 { | |
| 221 ngx_int_t rc; | |
| 222 ngx_str_t *ct; | |
| 223 ngx_chain_t out; | |
| 224 ngx_http_image_filter_ctx_t *ctx; | |
| 225 ngx_http_image_filter_conf_t *conf; | |
| 226 | |
| 227 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter"); | |
| 228 | |
| 229 if (in == NULL) { | |
| 230 return ngx_http_next_body_filter(r, in); | |
| 231 } | |
| 232 | |
| 233 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 234 | |
| 235 if (ctx == NULL) { | |
| 236 return ngx_http_next_body_filter(r, in); | |
| 237 } | |
| 238 | |
| 239 switch (ctx->phase) { | |
| 240 | |
| 241 case NGX_HTTP_IMAGE_START: | |
| 242 | |
| 243 ctx->type = ngx_http_image_test(r, in); | |
| 244 | |
| 245 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 246 | |
| 247 if (ctx->type == NGX_HTTP_IMAGE_NONE) { | |
| 248 | |
| 249 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 250 out.buf = ngx_http_image_json(r, NULL); | |
| 251 | |
| 252 if (out.buf) { | |
| 253 out.next = NULL; | |
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254 ctx->phase = NGX_HTTP_IMAGE_DONE; |
| 2788 | 255 |
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256 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 257 } |
| 258 } | |
| 259 | |
| 260 return ngx_http_filter_finalize_request(r, | |
| 261 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); | |
| 262 } | |
| 263 | |
| 264 /* override content type */ | |
| 265 | |
| 266 ct = &ngx_http_image_types[ctx->type - 1]; | |
| 267 r->headers_out.content_type_len = ct->len; | |
| 268 r->headers_out.content_type = *ct; | |
| 269 | |
| 270 if (conf->filter == NGX_HTTP_IMAGE_TEST) { | |
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271 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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272 |
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273 return ngx_http_image_send(r, ctx, in); |
| 2788 | 274 } |
| 275 | |
| 276 ctx->phase = NGX_HTTP_IMAGE_READ; | |
| 277 | |
| 278 /* fall through */ | |
| 279 | |
| 280 case NGX_HTTP_IMAGE_READ: | |
| 281 | |
| 282 rc = ngx_http_image_read(r, in); | |
| 283 | |
| 284 if (rc == NGX_AGAIN) { | |
| 285 return NGX_OK; | |
| 286 } | |
| 287 | |
| 288 if (rc == NGX_ERROR) { | |
| 289 return ngx_http_filter_finalize_request(r, | |
| 290 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); | |
| 291 } | |
| 292 | |
| 293 /* fall through */ | |
| 294 | |
| 295 case NGX_HTTP_IMAGE_PROCESS: | |
| 296 | |
| 297 out.buf = ngx_http_image_process(r); | |
| 298 | |
| 299 if (out.buf == NULL) { | |
| 300 return ngx_http_filter_finalize_request(r, | |
| 301 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); | |
| 302 } | |
| 303 | |
| 304 out.next = NULL; | |
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305 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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306 |
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307 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 308 |
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309 case NGX_HTTP_IMAGE_PASS: |
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310 |
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311 return ngx_http_next_body_filter(r, in); |
| 2788 | 312 |
| 313 default: /* NGX_HTTP_IMAGE_DONE */ | |
| 314 | |
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315 rc = ngx_http_next_body_filter(r, NULL); |
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316 |
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317 /* NGX_ERROR resets any pending data */ |
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318 return (rc == NGX_OK) ? NGX_ERROR : rc; |
| 2788 | 319 } |
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320 } |
| 2788 | 321 |
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322 |
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323 static ngx_int_t |
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324 ngx_http_image_send(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx, |
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325 ngx_chain_t *in) |
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326 { |
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327 ngx_int_t rc; |
| 2788 | 328 |
| 329 rc = ngx_http_next_header_filter(r); | |
| 330 | |
| 331 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
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332 return NGX_ERROR; |
| 2788 | 333 } |
| 334 | |
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335 rc = ngx_http_next_body_filter(r, in); |
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336 |
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337 if (ctx->phase == NGX_HTTP_IMAGE_DONE) { |
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338 /* NGX_ERROR resets any pending data */ |
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339 return (rc == NGX_OK) ? NGX_ERROR : rc; |
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340 } |
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341 |
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342 return rc; |
| 2788 | 343 } |
| 344 | |
| 345 | |
| 346 static ngx_uint_t | |
| 347 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in) | |
| 348 { | |
| 349 u_char *p; | |
| 350 | |
| 351 p = in->buf->pos; | |
| 352 | |
| 353 if (in->buf->last - p < 16) { | |
| 354 return NGX_HTTP_IMAGE_NONE; | |
| 355 } | |
| 356 | |
| 357 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 358 "image filter: \"%c%c\"", p[0], p[1]); | |
| 359 | |
| 360 if (p[0] == 0xff && p[1] == 0xd8) { | |
| 361 | |
| 362 /* JPEG */ | |
| 363 | |
| 364 return NGX_HTTP_IMAGE_JPEG; | |
| 365 | |
| 366 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8' | |
| 367 && p[4] == '9' && p[5] == 'a') | |
| 368 { | |
| 369 /* GIF */ | |
| 370 | |
| 371 return NGX_HTTP_IMAGE_GIF; | |
| 372 | |
| 373 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G' | |
| 374 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a) | |
| 375 { | |
| 376 /* PNG */ | |
| 377 | |
| 378 return NGX_HTTP_IMAGE_PNG; | |
| 379 } | |
| 380 | |
| 381 return NGX_HTTP_IMAGE_NONE; | |
| 382 } | |
| 383 | |
| 384 | |
| 385 static ngx_int_t | |
| 386 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in) | |
| 387 { | |
| 388 u_char *p; | |
| 389 size_t size, rest; | |
| 390 ngx_buf_t *b; | |
| 391 ngx_chain_t *cl; | |
| 392 ngx_http_image_filter_ctx_t *ctx; | |
| 393 | |
| 394 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 395 | |
| 396 if (ctx->image == NULL) { | |
| 397 ctx->image = ngx_palloc(r->pool, ctx->length); | |
| 398 if (ctx->image == NULL) { | |
| 399 return NGX_ERROR; | |
| 400 } | |
| 401 | |
| 402 ctx->last = ctx->image; | |
| 403 } | |
| 404 | |
| 405 p = ctx->last; | |
| 406 | |
| 407 for (cl = in; cl; cl = cl->next) { | |
| 408 | |
| 409 b = cl->buf; | |
| 410 size = b->last - b->pos; | |
| 411 | |
| 412 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 413 "image buf: %uz", size); | |
| 414 | |
| 415 rest = ctx->image + ctx->length - p; | |
| 416 size = (rest < size) ? rest : size; | |
| 417 | |
| 418 p = ngx_cpymem(p, b->pos, size); | |
| 419 b->pos += size; | |
| 420 | |
| 421 if (b->last_buf) { | |
| 422 ctx->last = p; | |
| 423 return NGX_OK; | |
| 424 } | |
| 425 } | |
| 426 | |
| 427 ctx->last = p; | |
| 428 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED; | |
| 429 | |
| 430 return NGX_AGAIN; | |
| 431 } | |
| 432 | |
| 433 | |
| 434 static ngx_buf_t * | |
| 435 ngx_http_image_process(ngx_http_request_t *r) | |
| 436 { | |
| 437 ngx_buf_t *b; | |
| 438 ngx_int_t rc; | |
| 439 ngx_http_image_filter_ctx_t *ctx; | |
| 440 ngx_http_image_filter_conf_t *conf; | |
| 441 | |
| 442 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED; | |
| 443 | |
| 444 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 445 | |
| 446 rc = ngx_http_image_size(r, ctx); | |
| 447 | |
| 448 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 449 | |
| 450 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 451 | |
| 452 b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL); | |
| 453 | |
| 454 } else if (rc == NGX_OK | |
| 455 && ctx->width <= conf->width | |
| 456 && ctx->height <= conf->height) | |
| 457 { | |
| 458 b = ngx_http_image_asis(r, ctx); | |
| 459 | |
| 460 } else { | |
| 461 b = ngx_http_image_resize(r, ctx); | |
| 462 } | |
| 463 | |
| 464 return b; | |
| 465 } | |
| 466 | |
| 467 | |
| 468 static ngx_buf_t * | |
| 469 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 470 { | |
| 471 size_t len; | |
| 472 ngx_buf_t *b; | |
| 473 | |
| 474 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 475 if (b == NULL) { | |
| 476 return NULL; | |
| 477 } | |
| 478 | |
| 479 b->memory = 1; | |
| 480 b->last_buf = 1; | |
| 481 | |
| 482 ngx_http_clean_header(r); | |
| 483 | |
| 484 r->headers_out.status = NGX_HTTP_OK; | |
| 485 r->headers_out.content_type.len = sizeof("text/plain") - 1; | |
| 486 r->headers_out.content_type.data = (u_char *) "text/plain"; | |
| 487 | |
| 488 if (ctx == NULL) { | |
| 489 b->pos = (u_char *) "{}" CRLF; | |
| 490 b->last = b->pos + sizeof("{}" CRLF) - 1; | |
| 491 | |
| 492 ngx_http_image_length(r, b); | |
| 493 | |
| 494 return b; | |
| 495 } | |
| 496 | |
| 497 len = sizeof("{ \"img\" : " | |
| 498 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1 | |
| 499 + 2 * NGX_SIZE_T_LEN; | |
| 500 | |
| 501 b->pos = ngx_pnalloc(r->pool, len); | |
| 502 if (b->pos == NULL) { | |
| 503 return NULL; | |
| 504 } | |
| 505 | |
| 506 b->last = ngx_sprintf(b->pos, | |
| 507 "{ \"img\" : " | |
| 508 "{ \"width\": %uz," | |
| 509 " \"height\": %uz," | |
| 510 " \"type\": \"%s\" } }" CRLF, | |
| 511 ctx->width, ctx->height, | |
| 512 ngx_http_image_types[ctx->type - 1].data + 6); | |
| 513 | |
| 514 ngx_http_image_length(r, b); | |
| 515 | |
| 516 return b; | |
| 517 } | |
| 518 | |
| 519 | |
| 520 static ngx_buf_t * | |
| 521 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 522 { | |
| 523 ngx_buf_t *b; | |
| 524 | |
| 525 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 526 if (b == NULL) { | |
| 527 return NULL; | |
| 528 } | |
| 529 | |
| 530 b->pos = ctx->image; | |
| 531 b->last = ctx->last; | |
| 532 b->memory = 1; | |
| 533 b->last_buf = 1; | |
| 534 | |
| 535 ngx_http_image_length(r, b); | |
| 536 | |
| 537 return b; | |
| 538 } | |
| 539 | |
| 540 | |
| 541 static void | |
| 542 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b) | |
| 543 { | |
| 544 r->headers_out.content_length_n = b->last - b->pos; | |
| 545 | |
| 546 if (r->headers_out.content_length) { | |
| 547 r->headers_out.content_length->hash = 0; | |
| 548 } | |
| 549 | |
| 550 r->headers_out.content_length = NULL; | |
| 551 } | |
| 552 | |
| 553 | |
| 554 static ngx_int_t | |
| 555 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 556 { | |
| 557 u_char *p, *last; | |
| 558 ngx_uint_t width, height; | |
| 559 | |
| 560 p = ctx->image; | |
| 561 | |
| 562 switch (ctx->type) { | |
| 563 | |
| 564 case NGX_HTTP_IMAGE_JPEG: | |
| 565 | |
| 566 p += 2; | |
| 567 last = ctx->image + ctx->length - 10; | |
| 568 | |
| 569 while (p < last) { | |
| 570 | |
| 571 if (p[0] == 0xff && p[1] != 0xff) { | |
| 572 | |
| 573 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 574 "JPEG: %02xd %02xd", *p, *(p + 1)); | |
| 575 | |
| 576 p++; | |
| 577 | |
| 578 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3 | |
| 579 || *p == 0xc9 || *p == 0xca || *p == 0xcb) | |
| 580 { | |
| 581 goto found; | |
| 582 } | |
| 583 | |
| 584 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 585 "JPEG: %02xd %02xd", p[1], p[2]); | |
| 586 | |
| 587 p += p[1] * 256 + p[2]; | |
| 588 | |
| 589 continue; | |
| 590 } | |
| 591 | |
| 592 p++; | |
| 593 } | |
| 594 | |
| 595 return NGX_DECLINED; | |
| 596 | |
| 597 found: | |
| 598 | |
| 599 width = p[6] * 256 + p[7]; | |
| 600 height = p[4] * 256 + p[5]; | |
| 601 | |
| 602 break; | |
| 603 | |
| 604 case NGX_HTTP_IMAGE_GIF: | |
| 605 | |
| 606 if (ctx->length < 10) { | |
| 607 return NGX_DECLINED; | |
| 608 } | |
| 609 | |
| 610 width = p[7] * 256 + p[6]; | |
| 611 height = p[9] * 256 + p[8]; | |
| 612 | |
| 613 break; | |
| 614 | |
| 615 case NGX_HTTP_IMAGE_PNG: | |
| 616 | |
| 617 if (ctx->length < 24) { | |
| 618 return NGX_DECLINED; | |
| 619 } | |
| 620 | |
| 621 width = p[18] * 256 + p[19]; | |
| 622 height = p[22] * 256 + p[23]; | |
| 623 | |
| 624 break; | |
| 625 | |
| 626 default: | |
| 627 | |
| 628 return NGX_DECLINED; | |
| 629 } | |
| 630 | |
| 631 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 632 "image size: %d x %d", width, height); | |
| 633 | |
| 634 ctx->width = width; | |
| 635 ctx->height = height; | |
| 636 | |
| 637 return NGX_OK; | |
| 638 } | |
| 639 | |
| 640 | |
| 641 static ngx_buf_t * | |
| 642 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 643 { | |
| 644 int sx, sy, dx, dy, ox, oy, | |
| 645 colors, transparent, size; | |
| 646 u_char *out; | |
| 647 ngx_buf_t *b; | |
| 648 ngx_uint_t resize; | |
| 649 gdImagePtr src, dst; | |
| 650 ngx_pool_cleanup_t *cln; | |
| 651 ngx_http_image_filter_conf_t *conf; | |
| 652 | |
| 653 src = ngx_http_image_source(r, ctx); | |
| 654 | |
| 655 if (src == NULL) { | |
| 656 return NULL; | |
| 657 } | |
| 658 | |
| 659 sx = gdImageSX(src); | |
| 660 sy = gdImageSY(src); | |
| 661 | |
| 662 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 663 | |
| 664 if ((ngx_uint_t) sx <= conf->width && (ngx_uint_t) sy <= conf->height) { | |
| 665 gdImageDestroy(src); | |
| 666 return ngx_http_image_asis(r, ctx); | |
| 667 } | |
| 668 | |
| 669 colors = gdImageColorsTotal(src); | |
| 670 transparent = gdImageGetTransparent(src); | |
| 671 | |
| 672 dx = sx; | |
| 673 dy = sy; | |
| 674 | |
| 675 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { | |
| 676 | |
| 677 if ((ngx_uint_t) dx > conf->width) { | |
| 678 dy = dy * conf->width / dx; | |
| 679 dy = dy ? dy : 1; | |
| 680 dx = conf->width; | |
| 681 } | |
| 682 | |
| 683 if ((ngx_uint_t) dy > conf->height) { | |
| 684 dx = dx * conf->height / dy; | |
| 685 dx = dx ? dx : 1; | |
| 686 dy = conf->height; | |
| 687 } | |
| 688 | |
| 689 resize = 1; | |
| 690 | |
| 691 } else { /* NGX_HTTP_IMAGE_CROP */ | |
| 692 | |
| 693 resize = 0; | |
| 694 | |
| 695 if ((ngx_uint_t) (dx * 100 / dy) < conf->width * 100 / conf->height) { | |
| 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 resize = 1; | |
| 702 } | |
| 703 | |
| 704 } else { | |
| 705 if ((ngx_uint_t) dy > conf->height) { | |
| 706 dx = dx * conf->height / dy; | |
| 707 dx = dx ? dx : 1; | |
| 708 dy = conf->height; | |
| 709 resize = 1; | |
| 710 } | |
| 711 } | |
| 712 } | |
| 713 | |
| 714 if (resize) { | |
| 715 dst = ngx_http_image_new(r, dx, dy, colors); | |
| 716 if (dst == NULL) { | |
| 717 gdImageDestroy(src); | |
| 718 return NULL; | |
| 719 } | |
| 720 | |
| 721 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); | |
| 722 | |
| 723 gdImageDestroy(src); | |
| 724 | |
| 725 } else { | |
| 726 dst = src; | |
| 727 } | |
| 728 | |
| 729 if (conf->filter == NGX_HTTP_IMAGE_CROP) { | |
| 730 | |
| 731 src = dst; | |
| 732 | |
| 733 if ((ngx_uint_t) dx > conf->width) { | |
| 734 ox = dx - conf->width; | |
| 735 | |
| 736 } else { | |
| 737 ox = 0; | |
| 738 } | |
| 739 | |
| 740 if ((ngx_uint_t) dy > conf->height) { | |
| 741 oy = dy - conf->height; | |
| 742 | |
| 743 } else { | |
| 744 oy = 0; | |
| 745 } | |
| 746 | |
| 747 if (ox || oy) { | |
| 748 | |
| 749 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors); | |
| 750 | |
| 751 if (dst == NULL) { | |
| 752 gdImageDestroy(src); | |
| 753 return NULL; | |
| 754 } | |
| 755 | |
| 756 ox /= 2; | |
| 757 oy /= 2; | |
| 758 | |
| 759 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 760 "image crop: %d x %d @ %d x %d", | |
| 761 dx, dy, ox, oy); | |
| 762 | |
| 763 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); | |
| 764 | |
| 765 gdImageDestroy(src); | |
| 766 } | |
| 767 } | |
| 768 | |
| 769 gdImageColorTransparent(dst, transparent); | |
| 770 | |
| 771 out = ngx_http_image_out(r, ctx->type, dst, &size); | |
| 772 | |
| 773 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 774 "image: %d x %d %d", sx, sy, colors); | |
| 775 | |
| 776 gdImageDestroy(dst); | |
| 777 ngx_pfree(r->pool, ctx->image); | |
| 778 | |
| 779 if (out == NULL) { | |
| 780 return NULL; | |
| 781 } | |
| 782 | |
| 783 cln = ngx_pool_cleanup_add(r->pool, 0); | |
| 784 if (cln == NULL) { | |
| 785 gdFree(out); | |
| 786 return NULL; | |
| 787 } | |
| 788 | |
| 789 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 790 if (b == NULL) { | |
| 791 gdFree(out); | |
| 792 return NULL; | |
| 793 } | |
| 794 | |
| 795 cln->handler = ngx_http_image_cleanup; | |
| 796 cln->data = out; | |
| 797 | |
| 798 b->pos = out; | |
| 799 b->last = out + size; | |
| 800 b->memory = 1; | |
| 801 b->last_buf = 1; | |
| 802 | |
| 803 ngx_http_image_length(r, b); | |
| 804 | |
| 805 return b; | |
| 806 } | |
| 807 | |
| 808 | |
| 809 static gdImagePtr | |
| 810 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 811 { | |
| 812 char *failed; | |
| 813 gdImagePtr img; | |
| 814 | |
| 815 img = NULL; | |
| 816 | |
| 817 switch (ctx->type) { | |
| 818 | |
| 819 case NGX_HTTP_IMAGE_JPEG: | |
| 820 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image); | |
| 821 failed = "gdImageCreateFromJpegPtr() failed"; | |
| 822 break; | |
| 823 | |
| 824 case NGX_HTTP_IMAGE_GIF: | |
| 825 img = gdImageCreateFromGifPtr(ctx->length, ctx->image); | |
| 826 failed = "gdImageCreateFromGifPtr() failed"; | |
| 827 break; | |
| 828 | |
| 829 case NGX_HTTP_IMAGE_PNG: | |
| 830 img = gdImageCreateFromPngPtr(ctx->length, ctx->image); | |
| 831 failed = "gdImageCreateFromPngPtr() failed"; | |
| 832 break; | |
| 833 | |
| 834 default: | |
| 835 failed = "unknown image type"; | |
| 836 break; | |
| 837 } | |
| 838 | |
| 839 if (img == NULL) { | |
| 840 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 841 } | |
| 842 | |
| 843 return img; | |
| 844 } | |
| 845 | |
| 846 | |
| 847 static gdImagePtr | |
| 848 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors) | |
| 849 { | |
| 850 gdImagePtr img; | |
| 851 | |
| 852 if (colors == 0) { | |
| 853 img = gdImageCreateTrueColor(w, h); | |
| 854 | |
| 855 if (img == NULL) { | |
| 856 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 857 "gdImageCreateTrueColor() failed"); | |
| 858 return NULL; | |
| 859 } | |
| 860 | |
| 861 } else { | |
| 862 img = gdImageCreate(w, h); | |
| 863 | |
| 864 if (img == NULL) { | |
| 865 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 866 "gdImageCreate() failed"); | |
| 867 return NULL; | |
| 868 } | |
| 869 } | |
| 870 | |
| 871 return img; | |
| 872 } | |
| 873 | |
| 874 | |
| 875 static u_char * | |
| 876 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img, | |
| 877 int *size) | |
| 878 { | |
| 879 char *failed; | |
| 880 u_char *out; | |
| 881 | |
| 882 out = NULL; | |
| 883 | |
| 884 switch (type) { | |
| 885 | |
| 886 case NGX_HTTP_IMAGE_JPEG: | |
| 887 out = gdImageJpegPtr(img, size, /* default quality */ -1); | |
| 888 failed = "gdImageJpegPtr() failed"; | |
| 889 break; | |
| 890 | |
| 891 case NGX_HTTP_IMAGE_GIF: | |
| 892 out = gdImageGifPtr(img, size); | |
| 893 failed = "gdImageGifPtr() failed"; | |
| 894 break; | |
| 895 | |
| 896 case NGX_HTTP_IMAGE_PNG: | |
| 897 out = gdImagePngPtr(img, size); | |
| 898 failed = "gdImagePngPtr() failed"; | |
| 899 break; | |
| 900 | |
| 901 default: | |
| 902 failed = "unknown image type"; | |
| 903 break; | |
| 904 } | |
| 905 | |
| 906 if (out == NULL) { | |
| 907 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 908 } | |
| 909 | |
| 910 return out; | |
| 911 } | |
| 912 | |
| 913 | |
| 914 static void | |
| 915 ngx_http_image_cleanup(void *data) | |
| 916 { | |
| 917 gdFree(data); | |
| 918 } | |
| 919 | |
| 920 | |
| 921 static void * | |
| 922 ngx_http_image_filter_create_conf(ngx_conf_t *cf) | |
| 923 { | |
| 924 ngx_http_image_filter_conf_t *conf; | |
| 925 | |
| 926 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t)); | |
| 927 if (conf == NULL) { | |
| 928 return NGX_CONF_ERROR; | |
| 929 } | |
| 930 | |
| 931 conf->filter = NGX_CONF_UNSET_UINT; | |
| 932 conf->buffer_size = NGX_CONF_UNSET_SIZE; | |
| 933 | |
| 934 return conf; | |
| 935 } | |
| 936 | |
| 937 | |
| 938 static char * | |
| 939 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 940 { | |
| 941 ngx_http_image_filter_conf_t *prev = parent; | |
| 942 ngx_http_image_filter_conf_t *conf = child; | |
| 943 | |
| 944 if (conf->filter == NGX_CONF_UNSET_UINT) { | |
| 945 | |
| 946 if (prev->filter == NGX_CONF_UNSET_UINT) { | |
| 947 conf->filter = NGX_HTTP_IMAGE_OFF; | |
| 948 | |
| 949 } else { | |
| 950 conf->filter = prev->filter; | |
| 951 conf->width = prev->width; | |
| 952 conf->height = prev->height; | |
| 953 } | |
| 954 } | |
| 955 | |
| 956 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, | |
| 957 1 * 1024 * 1024); | |
| 958 | |
| 959 return NGX_CONF_OK; | |
| 960 } | |
| 961 | |
| 962 | |
| 963 static char * | |
| 964 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 965 { | |
| 966 ngx_http_image_filter_conf_t *imcf = conf; | |
| 967 | |
| 968 ngx_str_t *value; | |
| 969 ngx_int_t n; | |
| 970 ngx_uint_t i; | |
| 971 | |
| 972 value = cf->args->elts; | |
| 973 | |
| 974 i = 1; | |
| 975 | |
| 976 if (cf->args->nelts == 2) { | |
| 977 if (ngx_strcmp(value[i].data, "off") == 0) { | |
| 978 imcf->filter = NGX_HTTP_IMAGE_OFF; | |
| 979 | |
| 980 } else if (ngx_strcmp(value[i].data, "test") == 0) { | |
| 981 imcf->filter = NGX_HTTP_IMAGE_TEST; | |
| 982 | |
| 983 } else if (ngx_strcmp(value[i].data, "size") == 0) { | |
| 984 imcf->filter = NGX_HTTP_IMAGE_SIZE; | |
| 985 | |
| 986 } else { | |
| 987 goto failed; | |
| 988 } | |
| 989 | |
| 990 return NGX_CONF_OK; | |
| 991 } | |
| 992 | |
| 993 if (ngx_strcmp(value[i].data, "resize") == 0) { | |
| 994 imcf->filter = NGX_HTTP_IMAGE_RESIZE; | |
| 995 | |
| 996 } else if (ngx_strcmp(value[i].data, "crop") == 0) { | |
| 997 imcf->filter = NGX_HTTP_IMAGE_CROP; | |
| 998 | |
| 999 } else { | |
| 1000 goto failed; | |
| 1001 } | |
| 1002 | |
| 1003 i++; | |
| 1004 | |
| 1005 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1006 imcf->width = (ngx_uint_t) -1; | |
| 1007 | |
| 1008 } else { | |
| 1009 n = ngx_atoi(value[i].data, value[i].len); | |
| 1010 if (n == NGX_ERROR) { | |
| 1011 goto failed; | |
| 1012 } | |
| 1013 | |
| 1014 imcf->width = (ngx_uint_t) n; | |
| 1015 } | |
| 1016 | |
| 1017 i++; | |
| 1018 | |
| 1019 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1020 imcf->height = (ngx_uint_t) -1; | |
| 1021 | |
| 1022 } else { | |
| 1023 n = ngx_atoi(value[i].data, value[i].len); | |
| 1024 if (n == NGX_ERROR) { | |
| 1025 goto failed; | |
| 1026 } | |
| 1027 | |
| 1028 imcf->height = (ngx_uint_t) n; | |
| 1029 } | |
| 1030 | |
| 1031 return NGX_CONF_OK; | |
| 1032 | |
| 1033 failed: | |
| 1034 | |
| 1035 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", | |
| 1036 &value[i]); | |
| 1037 | |
| 1038 return NGX_CONF_ERROR; | |
| 1039 } | |
| 1040 | |
| 1041 | |
| 1042 static ngx_int_t | |
| 1043 ngx_http_image_filter_init(ngx_conf_t *cf) | |
| 1044 { | |
| 1045 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 1046 ngx_http_top_header_filter = ngx_http_image_header_filter; | |
| 1047 | |
| 1048 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 1049 ngx_http_top_body_filter = ngx_http_image_body_filter; | |
| 1050 | |
| 1051 return NGX_OK; | |
| 1052 } |