Mercurial > hg > nginx
annotate src/http/modules/ngx_http_image_filter_module.c @ 2821:26e06e009ced
allow to pass image filter errors via the same location where the filter is set
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Fri, 08 May 2009 14:52:50 +0000 |
| parents | 43fe53832da7 |
| children | 0449d289256c |
| 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 | |
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184 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); |
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185 |
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186 if (ctx) { |
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187 ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module); |
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188 return ngx_http_next_header_filter(r); |
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189 } |
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190 |
| 2788 | 191 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t)); |
| 192 if (ctx == NULL) { | |
| 193 return NGX_ERROR; | |
| 194 } | |
| 195 | |
| 196 ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module); | |
| 197 | |
| 198 len = r->headers_out.content_length_n; | |
| 199 | |
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200 if (len != -1 && len > (off_t) conf->buffer_size) { |
| 2788 | 201 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| 202 "image filter: too big response: %O", len); | |
| 203 | |
| 204 return NGX_ERROR; | |
| 205 } | |
| 206 | |
| 207 if (len == -1) { | |
| 208 ctx->length = conf->buffer_size; | |
| 209 | |
| 210 } else { | |
| 211 ctx->length = (size_t) len; | |
| 212 } | |
| 213 | |
| 214 if (r->headers_out.refresh) { | |
| 215 r->headers_out.refresh->hash = 0; | |
| 216 } | |
| 217 | |
| 218 r->main_filter_need_in_memory = 1; | |
| 219 r->allow_ranges = 0; | |
| 220 | |
| 221 return NGX_OK; | |
| 222 } | |
| 223 | |
| 224 | |
| 225 static ngx_int_t | |
| 226 ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 227 { | |
| 228 ngx_int_t rc; | |
| 229 ngx_str_t *ct; | |
| 230 ngx_chain_t out; | |
| 231 ngx_http_image_filter_ctx_t *ctx; | |
| 232 ngx_http_image_filter_conf_t *conf; | |
| 233 | |
| 234 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter"); | |
| 235 | |
| 236 if (in == NULL) { | |
| 237 return ngx_http_next_body_filter(r, in); | |
| 238 } | |
| 239 | |
| 240 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 241 | |
| 242 if (ctx == NULL) { | |
| 243 return ngx_http_next_body_filter(r, in); | |
| 244 } | |
| 245 | |
| 246 switch (ctx->phase) { | |
| 247 | |
| 248 case NGX_HTTP_IMAGE_START: | |
| 249 | |
| 250 ctx->type = ngx_http_image_test(r, in); | |
| 251 | |
| 252 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 253 | |
| 254 if (ctx->type == NGX_HTTP_IMAGE_NONE) { | |
| 255 | |
| 256 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 257 out.buf = ngx_http_image_json(r, NULL); | |
| 258 | |
| 259 if (out.buf) { | |
| 260 out.next = NULL; | |
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261 ctx->phase = NGX_HTTP_IMAGE_DONE; |
| 2788 | 262 |
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263 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 264 } |
| 265 } | |
| 266 | |
| 267 return ngx_http_filter_finalize_request(r, | |
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268 &ngx_http_image_filter_module, |
| 2788 | 269 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 270 } | |
| 271 | |
| 272 /* override content type */ | |
| 273 | |
| 274 ct = &ngx_http_image_types[ctx->type - 1]; | |
| 275 r->headers_out.content_type_len = ct->len; | |
| 276 r->headers_out.content_type = *ct; | |
| 277 | |
| 278 if (conf->filter == NGX_HTTP_IMAGE_TEST) { | |
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279 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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280 |
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281 return ngx_http_image_send(r, ctx, in); |
| 2788 | 282 } |
| 283 | |
| 284 ctx->phase = NGX_HTTP_IMAGE_READ; | |
| 285 | |
| 286 /* fall through */ | |
| 287 | |
| 288 case NGX_HTTP_IMAGE_READ: | |
| 289 | |
| 290 rc = ngx_http_image_read(r, in); | |
| 291 | |
| 292 if (rc == NGX_AGAIN) { | |
| 293 return NGX_OK; | |
| 294 } | |
| 295 | |
| 296 if (rc == NGX_ERROR) { | |
| 297 return ngx_http_filter_finalize_request(r, | |
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298 &ngx_http_image_filter_module, |
| 2788 | 299 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 300 } | |
| 301 | |
| 302 /* fall through */ | |
| 303 | |
| 304 case NGX_HTTP_IMAGE_PROCESS: | |
| 305 | |
| 306 out.buf = ngx_http_image_process(r); | |
| 307 | |
| 308 if (out.buf == NULL) { | |
| 309 return ngx_http_filter_finalize_request(r, | |
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310 &ngx_http_image_filter_module, |
| 2788 | 311 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 312 } | |
| 313 | |
| 314 out.next = NULL; | |
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315 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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316 |
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317 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 318 |
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319 case NGX_HTTP_IMAGE_PASS: |
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320 |
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321 return ngx_http_next_body_filter(r, in); |
| 2788 | 322 |
| 323 default: /* NGX_HTTP_IMAGE_DONE */ | |
| 324 | |
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325 rc = ngx_http_next_body_filter(r, NULL); |
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326 |
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327 /* NGX_ERROR resets any pending data */ |
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328 return (rc == NGX_OK) ? NGX_ERROR : rc; |
| 2788 | 329 } |
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330 } |
| 2788 | 331 |
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332 |
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333 static ngx_int_t |
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334 ngx_http_image_send(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx, |
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335 ngx_chain_t *in) |
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336 { |
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337 ngx_int_t rc; |
| 2788 | 338 |
| 339 rc = ngx_http_next_header_filter(r); | |
| 340 | |
| 341 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
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342 return NGX_ERROR; |
| 2788 | 343 } |
| 344 | |
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345 rc = ngx_http_next_body_filter(r, in); |
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346 |
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347 if (ctx->phase == NGX_HTTP_IMAGE_DONE) { |
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348 /* NGX_ERROR resets any pending data */ |
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349 return (rc == NGX_OK) ? NGX_ERROR : rc; |
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350 } |
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351 |
|
43fe53832da7
handle big responses for "size" and "test" image_filters
Igor Sysoev <igor@sysoev.ru>
parents:
2795
diff
changeset
|
352 return rc; |
| 2788 | 353 } |
| 354 | |
| 355 | |
| 356 static ngx_uint_t | |
| 357 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in) | |
| 358 { | |
| 359 u_char *p; | |
| 360 | |
| 361 p = in->buf->pos; | |
| 362 | |
| 363 if (in->buf->last - p < 16) { | |
| 364 return NGX_HTTP_IMAGE_NONE; | |
| 365 } | |
| 366 | |
| 367 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 368 "image filter: \"%c%c\"", p[0], p[1]); | |
| 369 | |
| 370 if (p[0] == 0xff && p[1] == 0xd8) { | |
| 371 | |
| 372 /* JPEG */ | |
| 373 | |
| 374 return NGX_HTTP_IMAGE_JPEG; | |
| 375 | |
| 376 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8' | |
| 377 && p[4] == '9' && p[5] == 'a') | |
| 378 { | |
| 379 /* GIF */ | |
| 380 | |
| 381 return NGX_HTTP_IMAGE_GIF; | |
| 382 | |
| 383 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G' | |
| 384 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a) | |
| 385 { | |
| 386 /* PNG */ | |
| 387 | |
| 388 return NGX_HTTP_IMAGE_PNG; | |
| 389 } | |
| 390 | |
| 391 return NGX_HTTP_IMAGE_NONE; | |
| 392 } | |
| 393 | |
| 394 | |
| 395 static ngx_int_t | |
| 396 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in) | |
| 397 { | |
| 398 u_char *p; | |
| 399 size_t size, rest; | |
| 400 ngx_buf_t *b; | |
| 401 ngx_chain_t *cl; | |
| 402 ngx_http_image_filter_ctx_t *ctx; | |
| 403 | |
| 404 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 405 | |
| 406 if (ctx->image == NULL) { | |
| 407 ctx->image = ngx_palloc(r->pool, ctx->length); | |
| 408 if (ctx->image == NULL) { | |
| 409 return NGX_ERROR; | |
| 410 } | |
| 411 | |
| 412 ctx->last = ctx->image; | |
| 413 } | |
| 414 | |
| 415 p = ctx->last; | |
| 416 | |
| 417 for (cl = in; cl; cl = cl->next) { | |
| 418 | |
| 419 b = cl->buf; | |
| 420 size = b->last - b->pos; | |
| 421 | |
| 422 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 423 "image buf: %uz", size); | |
| 424 | |
| 425 rest = ctx->image + ctx->length - p; | |
| 426 size = (rest < size) ? rest : size; | |
| 427 | |
| 428 p = ngx_cpymem(p, b->pos, size); | |
| 429 b->pos += size; | |
| 430 | |
| 431 if (b->last_buf) { | |
| 432 ctx->last = p; | |
| 433 return NGX_OK; | |
| 434 } | |
| 435 } | |
| 436 | |
| 437 ctx->last = p; | |
| 438 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED; | |
| 439 | |
| 440 return NGX_AGAIN; | |
| 441 } | |
| 442 | |
| 443 | |
| 444 static ngx_buf_t * | |
| 445 ngx_http_image_process(ngx_http_request_t *r) | |
| 446 { | |
| 447 ngx_buf_t *b; | |
| 448 ngx_int_t rc; | |
| 449 ngx_http_image_filter_ctx_t *ctx; | |
| 450 ngx_http_image_filter_conf_t *conf; | |
| 451 | |
| 452 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED; | |
| 453 | |
| 454 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 455 | |
| 456 rc = ngx_http_image_size(r, ctx); | |
| 457 | |
| 458 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 459 | |
| 460 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 461 | |
| 462 b = ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL); | |
| 463 | |
| 464 } else if (rc == NGX_OK | |
| 465 && ctx->width <= conf->width | |
| 466 && ctx->height <= conf->height) | |
| 467 { | |
| 468 b = ngx_http_image_asis(r, ctx); | |
| 469 | |
| 470 } else { | |
| 471 b = ngx_http_image_resize(r, ctx); | |
| 472 } | |
| 473 | |
| 474 return b; | |
| 475 } | |
| 476 | |
| 477 | |
| 478 static ngx_buf_t * | |
| 479 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 480 { | |
| 481 size_t len; | |
| 482 ngx_buf_t *b; | |
| 483 | |
| 484 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 485 if (b == NULL) { | |
| 486 return NULL; | |
| 487 } | |
| 488 | |
| 489 b->memory = 1; | |
| 490 b->last_buf = 1; | |
| 491 | |
| 492 ngx_http_clean_header(r); | |
| 493 | |
| 494 r->headers_out.status = NGX_HTTP_OK; | |
| 495 r->headers_out.content_type.len = sizeof("text/plain") - 1; | |
| 496 r->headers_out.content_type.data = (u_char *) "text/plain"; | |
| 497 | |
| 498 if (ctx == NULL) { | |
| 499 b->pos = (u_char *) "{}" CRLF; | |
| 500 b->last = b->pos + sizeof("{}" CRLF) - 1; | |
| 501 | |
| 502 ngx_http_image_length(r, b); | |
| 503 | |
| 504 return b; | |
| 505 } | |
| 506 | |
| 507 len = sizeof("{ \"img\" : " | |
| 508 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1 | |
| 509 + 2 * NGX_SIZE_T_LEN; | |
| 510 | |
| 511 b->pos = ngx_pnalloc(r->pool, len); | |
| 512 if (b->pos == NULL) { | |
| 513 return NULL; | |
| 514 } | |
| 515 | |
| 516 b->last = ngx_sprintf(b->pos, | |
| 517 "{ \"img\" : " | |
| 518 "{ \"width\": %uz," | |
| 519 " \"height\": %uz," | |
| 520 " \"type\": \"%s\" } }" CRLF, | |
| 521 ctx->width, ctx->height, | |
| 522 ngx_http_image_types[ctx->type - 1].data + 6); | |
| 523 | |
| 524 ngx_http_image_length(r, b); | |
| 525 | |
| 526 return b; | |
| 527 } | |
| 528 | |
| 529 | |
| 530 static ngx_buf_t * | |
| 531 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 532 { | |
| 533 ngx_buf_t *b; | |
| 534 | |
| 535 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 536 if (b == NULL) { | |
| 537 return NULL; | |
| 538 } | |
| 539 | |
| 540 b->pos = ctx->image; | |
| 541 b->last = ctx->last; | |
| 542 b->memory = 1; | |
| 543 b->last_buf = 1; | |
| 544 | |
| 545 ngx_http_image_length(r, b); | |
| 546 | |
| 547 return b; | |
| 548 } | |
| 549 | |
| 550 | |
| 551 static void | |
| 552 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b) | |
| 553 { | |
| 554 r->headers_out.content_length_n = b->last - b->pos; | |
| 555 | |
| 556 if (r->headers_out.content_length) { | |
| 557 r->headers_out.content_length->hash = 0; | |
| 558 } | |
| 559 | |
| 560 r->headers_out.content_length = NULL; | |
| 561 } | |
| 562 | |
| 563 | |
| 564 static ngx_int_t | |
| 565 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 566 { | |
| 567 u_char *p, *last; | |
| 568 ngx_uint_t width, height; | |
| 569 | |
| 570 p = ctx->image; | |
| 571 | |
| 572 switch (ctx->type) { | |
| 573 | |
| 574 case NGX_HTTP_IMAGE_JPEG: | |
| 575 | |
| 576 p += 2; | |
| 577 last = ctx->image + ctx->length - 10; | |
| 578 | |
| 579 while (p < last) { | |
| 580 | |
| 581 if (p[0] == 0xff && p[1] != 0xff) { | |
| 582 | |
| 583 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 584 "JPEG: %02xd %02xd", *p, *(p + 1)); | |
| 585 | |
| 586 p++; | |
| 587 | |
| 588 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3 | |
| 589 || *p == 0xc9 || *p == 0xca || *p == 0xcb) | |
| 590 { | |
| 591 goto found; | |
| 592 } | |
| 593 | |
| 594 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 595 "JPEG: %02xd %02xd", p[1], p[2]); | |
| 596 | |
| 597 p += p[1] * 256 + p[2]; | |
| 598 | |
| 599 continue; | |
| 600 } | |
| 601 | |
| 602 p++; | |
| 603 } | |
| 604 | |
| 605 return NGX_DECLINED; | |
| 606 | |
| 607 found: | |
| 608 | |
| 609 width = p[6] * 256 + p[7]; | |
| 610 height = p[4] * 256 + p[5]; | |
| 611 | |
| 612 break; | |
| 613 | |
| 614 case NGX_HTTP_IMAGE_GIF: | |
| 615 | |
| 616 if (ctx->length < 10) { | |
| 617 return NGX_DECLINED; | |
| 618 } | |
| 619 | |
| 620 width = p[7] * 256 + p[6]; | |
| 621 height = p[9] * 256 + p[8]; | |
| 622 | |
| 623 break; | |
| 624 | |
| 625 case NGX_HTTP_IMAGE_PNG: | |
| 626 | |
| 627 if (ctx->length < 24) { | |
| 628 return NGX_DECLINED; | |
| 629 } | |
| 630 | |
| 631 width = p[18] * 256 + p[19]; | |
| 632 height = p[22] * 256 + p[23]; | |
| 633 | |
| 634 break; | |
| 635 | |
| 636 default: | |
| 637 | |
| 638 return NGX_DECLINED; | |
| 639 } | |
| 640 | |
| 641 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 642 "image size: %d x %d", width, height); | |
| 643 | |
| 644 ctx->width = width; | |
| 645 ctx->height = height; | |
| 646 | |
| 647 return NGX_OK; | |
| 648 } | |
| 649 | |
| 650 | |
| 651 static ngx_buf_t * | |
| 652 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 653 { | |
| 654 int sx, sy, dx, dy, ox, oy, | |
| 655 colors, transparent, size; | |
| 656 u_char *out; | |
| 657 ngx_buf_t *b; | |
| 658 ngx_uint_t resize; | |
| 659 gdImagePtr src, dst; | |
| 660 ngx_pool_cleanup_t *cln; | |
| 661 ngx_http_image_filter_conf_t *conf; | |
| 662 | |
| 663 src = ngx_http_image_source(r, ctx); | |
| 664 | |
| 665 if (src == NULL) { | |
| 666 return NULL; | |
| 667 } | |
| 668 | |
| 669 sx = gdImageSX(src); | |
| 670 sy = gdImageSY(src); | |
| 671 | |
| 672 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 673 | |
| 674 if ((ngx_uint_t) sx <= conf->width && (ngx_uint_t) sy <= conf->height) { | |
| 675 gdImageDestroy(src); | |
| 676 return ngx_http_image_asis(r, ctx); | |
| 677 } | |
| 678 | |
| 679 colors = gdImageColorsTotal(src); | |
| 680 transparent = gdImageGetTransparent(src); | |
| 681 | |
| 682 dx = sx; | |
| 683 dy = sy; | |
| 684 | |
| 685 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { | |
| 686 | |
| 687 if ((ngx_uint_t) dx > conf->width) { | |
| 688 dy = dy * conf->width / dx; | |
| 689 dy = dy ? dy : 1; | |
| 690 dx = conf->width; | |
| 691 } | |
| 692 | |
| 693 if ((ngx_uint_t) dy > conf->height) { | |
| 694 dx = dx * conf->height / dy; | |
| 695 dx = dx ? dx : 1; | |
| 696 dy = conf->height; | |
| 697 } | |
| 698 | |
| 699 resize = 1; | |
| 700 | |
| 701 } else { /* NGX_HTTP_IMAGE_CROP */ | |
| 702 | |
| 703 resize = 0; | |
| 704 | |
| 705 if ((ngx_uint_t) (dx * 100 / dy) < conf->width * 100 / conf->height) { | |
| 706 | |
| 707 if ((ngx_uint_t) dx > conf->width) { | |
| 708 dy = dy * conf->width / dx; | |
| 709 dy = dy ? dy : 1; | |
| 710 dx = conf->width; | |
| 711 resize = 1; | |
| 712 } | |
| 713 | |
| 714 } else { | |
| 715 if ((ngx_uint_t) dy > conf->height) { | |
| 716 dx = dx * conf->height / dy; | |
| 717 dx = dx ? dx : 1; | |
| 718 dy = conf->height; | |
| 719 resize = 1; | |
| 720 } | |
| 721 } | |
| 722 } | |
| 723 | |
| 724 if (resize) { | |
| 725 dst = ngx_http_image_new(r, dx, dy, colors); | |
| 726 if (dst == NULL) { | |
| 727 gdImageDestroy(src); | |
| 728 return NULL; | |
| 729 } | |
| 730 | |
| 731 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); | |
| 732 | |
| 733 gdImageDestroy(src); | |
| 734 | |
| 735 } else { | |
| 736 dst = src; | |
| 737 } | |
| 738 | |
| 739 if (conf->filter == NGX_HTTP_IMAGE_CROP) { | |
| 740 | |
| 741 src = dst; | |
| 742 | |
| 743 if ((ngx_uint_t) dx > conf->width) { | |
| 744 ox = dx - conf->width; | |
| 745 | |
| 746 } else { | |
| 747 ox = 0; | |
| 748 } | |
| 749 | |
| 750 if ((ngx_uint_t) dy > conf->height) { | |
| 751 oy = dy - conf->height; | |
| 752 | |
| 753 } else { | |
| 754 oy = 0; | |
| 755 } | |
| 756 | |
| 757 if (ox || oy) { | |
| 758 | |
| 759 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors); | |
| 760 | |
| 761 if (dst == NULL) { | |
| 762 gdImageDestroy(src); | |
| 763 return NULL; | |
| 764 } | |
| 765 | |
| 766 ox /= 2; | |
| 767 oy /= 2; | |
| 768 | |
| 769 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 770 "image crop: %d x %d @ %d x %d", | |
| 771 dx, dy, ox, oy); | |
| 772 | |
| 773 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); | |
| 774 | |
| 775 gdImageDestroy(src); | |
| 776 } | |
| 777 } | |
| 778 | |
| 779 gdImageColorTransparent(dst, transparent); | |
| 780 | |
| 781 out = ngx_http_image_out(r, ctx->type, dst, &size); | |
| 782 | |
| 783 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 784 "image: %d x %d %d", sx, sy, colors); | |
| 785 | |
| 786 gdImageDestroy(dst); | |
| 787 ngx_pfree(r->pool, ctx->image); | |
| 788 | |
| 789 if (out == NULL) { | |
| 790 return NULL; | |
| 791 } | |
| 792 | |
| 793 cln = ngx_pool_cleanup_add(r->pool, 0); | |
| 794 if (cln == NULL) { | |
| 795 gdFree(out); | |
| 796 return NULL; | |
| 797 } | |
| 798 | |
| 799 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 800 if (b == NULL) { | |
| 801 gdFree(out); | |
| 802 return NULL; | |
| 803 } | |
| 804 | |
| 805 cln->handler = ngx_http_image_cleanup; | |
| 806 cln->data = out; | |
| 807 | |
| 808 b->pos = out; | |
| 809 b->last = out + size; | |
| 810 b->memory = 1; | |
| 811 b->last_buf = 1; | |
| 812 | |
| 813 ngx_http_image_length(r, b); | |
| 814 | |
| 815 return b; | |
| 816 } | |
| 817 | |
| 818 | |
| 819 static gdImagePtr | |
| 820 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 821 { | |
| 822 char *failed; | |
| 823 gdImagePtr img; | |
| 824 | |
| 825 img = NULL; | |
| 826 | |
| 827 switch (ctx->type) { | |
| 828 | |
| 829 case NGX_HTTP_IMAGE_JPEG: | |
| 830 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image); | |
| 831 failed = "gdImageCreateFromJpegPtr() failed"; | |
| 832 break; | |
| 833 | |
| 834 case NGX_HTTP_IMAGE_GIF: | |
| 835 img = gdImageCreateFromGifPtr(ctx->length, ctx->image); | |
| 836 failed = "gdImageCreateFromGifPtr() failed"; | |
| 837 break; | |
| 838 | |
| 839 case NGX_HTTP_IMAGE_PNG: | |
| 840 img = gdImageCreateFromPngPtr(ctx->length, ctx->image); | |
| 841 failed = "gdImageCreateFromPngPtr() failed"; | |
| 842 break; | |
| 843 | |
| 844 default: | |
| 845 failed = "unknown image type"; | |
| 846 break; | |
| 847 } | |
| 848 | |
| 849 if (img == NULL) { | |
| 850 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 851 } | |
| 852 | |
| 853 return img; | |
| 854 } | |
| 855 | |
| 856 | |
| 857 static gdImagePtr | |
| 858 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors) | |
| 859 { | |
| 860 gdImagePtr img; | |
| 861 | |
| 862 if (colors == 0) { | |
| 863 img = gdImageCreateTrueColor(w, h); | |
| 864 | |
| 865 if (img == NULL) { | |
| 866 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 867 "gdImageCreateTrueColor() failed"); | |
| 868 return NULL; | |
| 869 } | |
| 870 | |
| 871 } else { | |
| 872 img = gdImageCreate(w, h); | |
| 873 | |
| 874 if (img == NULL) { | |
| 875 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 876 "gdImageCreate() failed"); | |
| 877 return NULL; | |
| 878 } | |
| 879 } | |
| 880 | |
| 881 return img; | |
| 882 } | |
| 883 | |
| 884 | |
| 885 static u_char * | |
| 886 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img, | |
| 887 int *size) | |
| 888 { | |
| 889 char *failed; | |
| 890 u_char *out; | |
| 891 | |
| 892 out = NULL; | |
| 893 | |
| 894 switch (type) { | |
| 895 | |
| 896 case NGX_HTTP_IMAGE_JPEG: | |
| 897 out = gdImageJpegPtr(img, size, /* default quality */ -1); | |
| 898 failed = "gdImageJpegPtr() failed"; | |
| 899 break; | |
| 900 | |
| 901 case NGX_HTTP_IMAGE_GIF: | |
| 902 out = gdImageGifPtr(img, size); | |
| 903 failed = "gdImageGifPtr() failed"; | |
| 904 break; | |
| 905 | |
| 906 case NGX_HTTP_IMAGE_PNG: | |
| 907 out = gdImagePngPtr(img, size); | |
| 908 failed = "gdImagePngPtr() failed"; | |
| 909 break; | |
| 910 | |
| 911 default: | |
| 912 failed = "unknown image type"; | |
| 913 break; | |
| 914 } | |
| 915 | |
| 916 if (out == NULL) { | |
| 917 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 918 } | |
| 919 | |
| 920 return out; | |
| 921 } | |
| 922 | |
| 923 | |
| 924 static void | |
| 925 ngx_http_image_cleanup(void *data) | |
| 926 { | |
| 927 gdFree(data); | |
| 928 } | |
| 929 | |
| 930 | |
| 931 static void * | |
| 932 ngx_http_image_filter_create_conf(ngx_conf_t *cf) | |
| 933 { | |
| 934 ngx_http_image_filter_conf_t *conf; | |
| 935 | |
| 936 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t)); | |
| 937 if (conf == NULL) { | |
| 938 return NGX_CONF_ERROR; | |
| 939 } | |
| 940 | |
| 941 conf->filter = NGX_CONF_UNSET_UINT; | |
| 942 conf->buffer_size = NGX_CONF_UNSET_SIZE; | |
| 943 | |
| 944 return conf; | |
| 945 } | |
| 946 | |
| 947 | |
| 948 static char * | |
| 949 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 950 { | |
| 951 ngx_http_image_filter_conf_t *prev = parent; | |
| 952 ngx_http_image_filter_conf_t *conf = child; | |
| 953 | |
| 954 if (conf->filter == NGX_CONF_UNSET_UINT) { | |
| 955 | |
| 956 if (prev->filter == NGX_CONF_UNSET_UINT) { | |
| 957 conf->filter = NGX_HTTP_IMAGE_OFF; | |
| 958 | |
| 959 } else { | |
| 960 conf->filter = prev->filter; | |
| 961 conf->width = prev->width; | |
| 962 conf->height = prev->height; | |
| 963 } | |
| 964 } | |
| 965 | |
| 966 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, | |
| 967 1 * 1024 * 1024); | |
| 968 | |
| 969 return NGX_CONF_OK; | |
| 970 } | |
| 971 | |
| 972 | |
| 973 static char * | |
| 974 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 975 { | |
| 976 ngx_http_image_filter_conf_t *imcf = conf; | |
| 977 | |
| 978 ngx_str_t *value; | |
| 979 ngx_int_t n; | |
| 980 ngx_uint_t i; | |
| 981 | |
| 982 value = cf->args->elts; | |
| 983 | |
| 984 i = 1; | |
| 985 | |
| 986 if (cf->args->nelts == 2) { | |
| 987 if (ngx_strcmp(value[i].data, "off") == 0) { | |
| 988 imcf->filter = NGX_HTTP_IMAGE_OFF; | |
| 989 | |
| 990 } else if (ngx_strcmp(value[i].data, "test") == 0) { | |
| 991 imcf->filter = NGX_HTTP_IMAGE_TEST; | |
| 992 | |
| 993 } else if (ngx_strcmp(value[i].data, "size") == 0) { | |
| 994 imcf->filter = NGX_HTTP_IMAGE_SIZE; | |
| 995 | |
| 996 } else { | |
| 997 goto failed; | |
| 998 } | |
| 999 | |
| 1000 return NGX_CONF_OK; | |
| 1001 } | |
| 1002 | |
| 1003 if (ngx_strcmp(value[i].data, "resize") == 0) { | |
| 1004 imcf->filter = NGX_HTTP_IMAGE_RESIZE; | |
| 1005 | |
| 1006 } else if (ngx_strcmp(value[i].data, "crop") == 0) { | |
| 1007 imcf->filter = NGX_HTTP_IMAGE_CROP; | |
| 1008 | |
| 1009 } else { | |
| 1010 goto failed; | |
| 1011 } | |
| 1012 | |
| 1013 i++; | |
| 1014 | |
| 1015 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1016 imcf->width = (ngx_uint_t) -1; | |
| 1017 | |
| 1018 } else { | |
| 1019 n = ngx_atoi(value[i].data, value[i].len); | |
| 1020 if (n == NGX_ERROR) { | |
| 1021 goto failed; | |
| 1022 } | |
| 1023 | |
| 1024 imcf->width = (ngx_uint_t) n; | |
| 1025 } | |
| 1026 | |
| 1027 i++; | |
| 1028 | |
| 1029 if (value[i].len == 1 && value[i].data[0] == '-') { | |
| 1030 imcf->height = (ngx_uint_t) -1; | |
| 1031 | |
| 1032 } else { | |
| 1033 n = ngx_atoi(value[i].data, value[i].len); | |
| 1034 if (n == NGX_ERROR) { | |
| 1035 goto failed; | |
| 1036 } | |
| 1037 | |
| 1038 imcf->height = (ngx_uint_t) n; | |
| 1039 } | |
| 1040 | |
| 1041 return NGX_CONF_OK; | |
| 1042 | |
| 1043 failed: | |
| 1044 | |
| 1045 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", | |
| 1046 &value[i]); | |
| 1047 | |
| 1048 return NGX_CONF_ERROR; | |
| 1049 } | |
| 1050 | |
| 1051 | |
| 1052 static ngx_int_t | |
| 1053 ngx_http_image_filter_init(ngx_conf_t *cf) | |
| 1054 { | |
| 1055 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 1056 ngx_http_top_header_filter = ngx_http_image_header_filter; | |
| 1057 | |
| 1058 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 1059 ngx_http_top_body_filter = ngx_http_image_body_filter; | |
| 1060 | |
| 1061 return NGX_OK; | |
| 1062 } |