Mercurial > hg > nginx
annotate src/http/modules/ngx_http_image_filter_module.c @ 3117:e2a510ac53db
fix transparency in GIF
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sat, 12 Sep 2009 09:46:28 +0000 |
| parents | fa8503fd3647 |
| children | 28a6aa24b453 |
| 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 |
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43 ngx_http_complex_value_t *wcv; |
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44 ngx_http_complex_value_t *hcv; |
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45 |
| 2788 | 46 size_t buffer_size; |
| 47 } ngx_http_image_filter_conf_t; | |
| 48 | |
| 49 | |
| 50 typedef struct { | |
| 51 u_char *image; | |
| 52 u_char *last; | |
| 53 | |
| 54 size_t length; | |
| 55 | |
| 56 ngx_uint_t width; | |
| 57 ngx_uint_t height; | |
| 58 | |
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59 ngx_uint_t max_width; |
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60 ngx_uint_t max_height; |
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61 |
| 2788 | 62 ngx_uint_t phase; |
| 63 ngx_uint_t type; | |
| 64 } ngx_http_image_filter_ctx_t; | |
| 65 | |
| 66 | |
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67 static ngx_int_t ngx_http_image_send(ngx_http_request_t *r, |
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68 ngx_http_image_filter_ctx_t *ctx, ngx_chain_t *in); |
| 2788 | 69 static ngx_uint_t ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in); |
| 70 static ngx_int_t ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in); | |
| 71 static ngx_buf_t *ngx_http_image_process(ngx_http_request_t *r); | |
| 72 static ngx_buf_t *ngx_http_image_json(ngx_http_request_t *r, | |
| 73 ngx_http_image_filter_ctx_t *ctx); | |
| 74 static ngx_buf_t *ngx_http_image_asis(ngx_http_request_t *r, | |
| 75 ngx_http_image_filter_ctx_t *ctx); | |
| 76 static void ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b); | |
| 77 static ngx_int_t ngx_http_image_size(ngx_http_request_t *r, | |
| 78 ngx_http_image_filter_ctx_t *ctx); | |
| 79 | |
| 80 static ngx_buf_t *ngx_http_image_resize(ngx_http_request_t *r, | |
| 81 ngx_http_image_filter_ctx_t *ctx); | |
| 82 static gdImagePtr ngx_http_image_source(ngx_http_request_t *r, | |
| 83 ngx_http_image_filter_ctx_t *ctx); | |
| 84 static gdImagePtr ngx_http_image_new(ngx_http_request_t *r, int w, int h, | |
| 85 int colors); | |
| 86 static u_char *ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, | |
| 87 gdImagePtr img, int *size); | |
| 88 static void ngx_http_image_cleanup(void *data); | |
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89 static ngx_uint_t ngx_http_image_filter_get_value(ngx_http_request_t *r, |
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90 ngx_http_complex_value_t *cv, ngx_uint_t v); |
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91 static ngx_uint_t ngx_http_image_filter_value(ngx_str_t *value); |
| 2788 | 92 |
| 93 | |
| 94 static void *ngx_http_image_filter_create_conf(ngx_conf_t *cf); | |
| 95 static char *ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, | |
| 96 void *child); | |
| 97 static char *ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 98 void *conf); | |
| 99 static ngx_int_t ngx_http_image_filter_init(ngx_conf_t *cf); | |
| 100 | |
| 101 | |
| 102 static ngx_command_t ngx_http_image_filter_commands[] = { | |
| 103 | |
| 104 { ngx_string("image_filter"), | |
| 105 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE13, | |
| 106 ngx_http_image_filter, | |
| 107 NGX_HTTP_LOC_CONF_OFFSET, | |
| 108 0, | |
| 109 NULL }, | |
| 110 | |
| 2848 | 111 { ngx_string("image_filter_jpeg_quality"), |
| 112 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 113 ngx_conf_set_num_slot, | |
| 114 NGX_HTTP_LOC_CONF_OFFSET, | |
| 115 offsetof(ngx_http_image_filter_conf_t, jpeg_quality), | |
| 116 NULL }, | |
| 117 | |
| 2788 | 118 { ngx_string("image_filter_buffer"), |
| 119 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 120 ngx_conf_set_size_slot, | |
| 121 NGX_HTTP_LOC_CONF_OFFSET, | |
| 122 offsetof(ngx_http_image_filter_conf_t, buffer_size), | |
| 123 NULL }, | |
| 124 | |
| 125 ngx_null_command | |
| 126 }; | |
| 127 | |
| 128 | |
| 129 static ngx_http_module_t ngx_http_image_filter_module_ctx = { | |
| 130 NULL, /* preconfiguration */ | |
| 131 ngx_http_image_filter_init, /* postconfiguration */ | |
| 132 | |
| 133 NULL, /* create main configuration */ | |
| 134 NULL, /* init main configuration */ | |
| 135 | |
| 136 NULL, /* create server configuration */ | |
| 137 NULL, /* merge server configuration */ | |
| 138 | |
| 139 ngx_http_image_filter_create_conf, /* create location configuration */ | |
| 140 ngx_http_image_filter_merge_conf /* merge location configuration */ | |
| 141 }; | |
| 142 | |
| 143 | |
| 144 ngx_module_t ngx_http_image_filter_module = { | |
| 145 NGX_MODULE_V1, | |
| 146 &ngx_http_image_filter_module_ctx, /* module context */ | |
| 147 ngx_http_image_filter_commands, /* module directives */ | |
| 148 NGX_HTTP_MODULE, /* module type */ | |
| 149 NULL, /* init master */ | |
| 150 NULL, /* init module */ | |
| 151 NULL, /* init process */ | |
| 152 NULL, /* init thread */ | |
| 153 NULL, /* exit thread */ | |
| 154 NULL, /* exit process */ | |
| 155 NULL, /* exit master */ | |
| 156 NGX_MODULE_V1_PADDING | |
| 157 }; | |
| 158 | |
| 159 | |
| 160 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
| 161 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
| 162 | |
| 163 | |
| 164 static ngx_str_t ngx_http_image_types[] = { | |
| 165 ngx_string("image/jpeg"), | |
| 166 ngx_string("image/gif"), | |
| 167 ngx_string("image/png") | |
| 168 }; | |
| 169 | |
| 170 | |
| 171 static ngx_int_t | |
| 172 ngx_http_image_header_filter(ngx_http_request_t *r) | |
| 173 { | |
| 174 off_t len; | |
| 175 ngx_http_image_filter_ctx_t *ctx; | |
| 176 ngx_http_image_filter_conf_t *conf; | |
| 177 | |
| 178 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED) { | |
| 179 return ngx_http_next_header_filter(r); | |
| 180 } | |
| 181 | |
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182 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); |
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183 |
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184 if (ctx) { |
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185 ngx_http_set_ctx(r, NULL, ngx_http_image_filter_module); |
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186 return ngx_http_next_header_filter(r); |
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187 } |
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188 |
| 2788 | 189 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); |
| 190 | |
| 191 if (conf->filter == NGX_HTTP_IMAGE_OFF) { | |
| 192 return ngx_http_next_header_filter(r); | |
| 193 } | |
| 194 | |
| 195 if (r->headers_out.content_type.len | |
| 196 >= sizeof("multipart/x-mixed-replace") - 1 | |
| 197 && ngx_strncasecmp(r->headers_out.content_type.data, | |
| 198 (u_char *) "multipart/x-mixed-replace", | |
| 199 sizeof("multipart/x-mixed-replace") - 1) | |
| 200 == 0) | |
| 201 { | |
| 202 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 203 "image filter: multipart/x-mixed-replace response"); | |
| 204 | |
| 205 return NGX_ERROR; | |
| 206 } | |
| 207 | |
| 208 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_image_filter_ctx_t)); | |
| 209 if (ctx == NULL) { | |
| 210 return NGX_ERROR; | |
| 211 } | |
| 212 | |
| 213 ngx_http_set_ctx(r, ctx, ngx_http_image_filter_module); | |
| 214 | |
| 215 len = r->headers_out.content_length_n; | |
| 216 | |
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217 if (len != -1 && len > (off_t) conf->buffer_size) { |
| 2788 | 218 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| 219 "image filter: too big response: %O", len); | |
| 220 | |
| 221 return NGX_ERROR; | |
| 222 } | |
| 223 | |
| 224 if (len == -1) { | |
| 225 ctx->length = conf->buffer_size; | |
| 226 | |
| 227 } else { | |
| 228 ctx->length = (size_t) len; | |
| 229 } | |
| 230 | |
| 231 if (r->headers_out.refresh) { | |
| 232 r->headers_out.refresh->hash = 0; | |
| 233 } | |
| 234 | |
| 235 r->main_filter_need_in_memory = 1; | |
| 236 r->allow_ranges = 0; | |
| 237 | |
| 238 return NGX_OK; | |
| 239 } | |
| 240 | |
| 241 | |
| 242 static ngx_int_t | |
| 243 ngx_http_image_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 244 { | |
| 245 ngx_int_t rc; | |
| 246 ngx_str_t *ct; | |
| 247 ngx_chain_t out; | |
| 248 ngx_http_image_filter_ctx_t *ctx; | |
| 249 ngx_http_image_filter_conf_t *conf; | |
| 250 | |
| 251 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "image filter"); | |
| 252 | |
| 253 if (in == NULL) { | |
| 254 return ngx_http_next_body_filter(r, in); | |
| 255 } | |
| 256 | |
| 257 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 258 | |
| 259 if (ctx == NULL) { | |
| 260 return ngx_http_next_body_filter(r, in); | |
| 261 } | |
| 262 | |
| 263 switch (ctx->phase) { | |
| 264 | |
| 265 case NGX_HTTP_IMAGE_START: | |
| 266 | |
| 267 ctx->type = ngx_http_image_test(r, in); | |
| 268 | |
| 269 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 270 | |
| 271 if (ctx->type == NGX_HTTP_IMAGE_NONE) { | |
| 272 | |
| 273 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
| 274 out.buf = ngx_http_image_json(r, NULL); | |
| 275 | |
| 276 if (out.buf) { | |
| 277 out.next = NULL; | |
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278 ctx->phase = NGX_HTTP_IMAGE_DONE; |
| 2788 | 279 |
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280 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 281 } |
| 282 } | |
| 283 | |
| 284 return ngx_http_filter_finalize_request(r, | |
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285 &ngx_http_image_filter_module, |
| 2788 | 286 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 287 } | |
| 288 | |
| 289 /* override content type */ | |
| 290 | |
| 291 ct = &ngx_http_image_types[ctx->type - 1]; | |
| 292 r->headers_out.content_type_len = ct->len; | |
| 293 r->headers_out.content_type = *ct; | |
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294 r->headers_out.content_type_lowcase = NULL; |
| 2788 | 295 |
| 296 if (conf->filter == NGX_HTTP_IMAGE_TEST) { | |
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297 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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298 |
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299 return ngx_http_image_send(r, ctx, in); |
| 2788 | 300 } |
| 301 | |
| 302 ctx->phase = NGX_HTTP_IMAGE_READ; | |
| 303 | |
| 304 /* fall through */ | |
| 305 | |
| 306 case NGX_HTTP_IMAGE_READ: | |
| 307 | |
| 308 rc = ngx_http_image_read(r, in); | |
| 309 | |
| 310 if (rc == NGX_AGAIN) { | |
| 311 return NGX_OK; | |
| 312 } | |
| 313 | |
| 314 if (rc == NGX_ERROR) { | |
| 315 return ngx_http_filter_finalize_request(r, | |
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316 &ngx_http_image_filter_module, |
| 2788 | 317 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 318 } | |
| 319 | |
| 320 /* fall through */ | |
| 321 | |
| 322 case NGX_HTTP_IMAGE_PROCESS: | |
| 323 | |
| 324 out.buf = ngx_http_image_process(r); | |
| 325 | |
| 326 if (out.buf == NULL) { | |
| 327 return ngx_http_filter_finalize_request(r, | |
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328 &ngx_http_image_filter_module, |
| 2788 | 329 NGX_HTTP_UNSUPPORTED_MEDIA_TYPE); |
| 330 } | |
| 331 | |
| 332 out.next = NULL; | |
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333 ctx->phase = NGX_HTTP_IMAGE_PASS; |
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334 |
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335 return ngx_http_image_send(r, ctx, &out); |
| 2788 | 336 |
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337 case NGX_HTTP_IMAGE_PASS: |
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338 |
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339 return ngx_http_next_body_filter(r, in); |
| 2788 | 340 |
| 341 default: /* NGX_HTTP_IMAGE_DONE */ | |
| 342 | |
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343 rc = ngx_http_next_body_filter(r, NULL); |
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344 |
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345 /* NGX_ERROR resets any pending data */ |
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346 return (rc == NGX_OK) ? NGX_ERROR : rc; |
| 2788 | 347 } |
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348 } |
| 2788 | 349 |
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350 |
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351 static ngx_int_t |
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352 ngx_http_image_send(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx, |
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353 ngx_chain_t *in) |
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354 { |
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355 ngx_int_t rc; |
| 2788 | 356 |
| 357 rc = ngx_http_next_header_filter(r); | |
| 358 | |
| 359 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { | |
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360 return NGX_ERROR; |
| 2788 | 361 } |
| 362 | |
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363 rc = ngx_http_next_body_filter(r, in); |
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364 |
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365 if (ctx->phase == NGX_HTTP_IMAGE_DONE) { |
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366 /* NGX_ERROR resets any pending data */ |
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367 return (rc == NGX_OK) ? NGX_ERROR : rc; |
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368 } |
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369 |
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370 return rc; |
| 2788 | 371 } |
| 372 | |
| 373 | |
| 374 static ngx_uint_t | |
| 375 ngx_http_image_test(ngx_http_request_t *r, ngx_chain_t *in) | |
| 376 { | |
| 377 u_char *p; | |
| 378 | |
| 379 p = in->buf->pos; | |
| 380 | |
| 381 if (in->buf->last - p < 16) { | |
| 382 return NGX_HTTP_IMAGE_NONE; | |
| 383 } | |
| 384 | |
| 385 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 386 "image filter: \"%c%c\"", p[0], p[1]); | |
| 387 | |
| 388 if (p[0] == 0xff && p[1] == 0xd8) { | |
| 389 | |
| 390 /* JPEG */ | |
| 391 | |
| 392 return NGX_HTTP_IMAGE_JPEG; | |
| 393 | |
| 394 } else if (p[0] == 'G' && p[1] == 'I' && p[2] == 'F' && p[3] == '8' | |
| 2918 | 395 && p[5] == 'a') |
| 2788 | 396 { |
| 2918 | 397 if (p[4] == '9' || p[4] == '7') { |
| 398 /* GIF */ | |
| 399 return NGX_HTTP_IMAGE_GIF; | |
| 400 } | |
| 2788 | 401 |
| 402 } else if (p[0] == 0x89 && p[1] == 'P' && p[2] == 'N' && p[3] == 'G' | |
| 403 && p[4] == 0x0d && p[5] == 0x0a && p[6] == 0x1a && p[7] == 0x0a) | |
| 404 { | |
| 405 /* PNG */ | |
| 406 | |
| 407 return NGX_HTTP_IMAGE_PNG; | |
| 408 } | |
| 409 | |
| 410 return NGX_HTTP_IMAGE_NONE; | |
| 411 } | |
| 412 | |
| 413 | |
| 414 static ngx_int_t | |
| 415 ngx_http_image_read(ngx_http_request_t *r, ngx_chain_t *in) | |
| 416 { | |
| 417 u_char *p; | |
| 418 size_t size, rest; | |
| 419 ngx_buf_t *b; | |
| 420 ngx_chain_t *cl; | |
| 421 ngx_http_image_filter_ctx_t *ctx; | |
| 422 | |
| 423 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 424 | |
| 425 if (ctx->image == NULL) { | |
| 426 ctx->image = ngx_palloc(r->pool, ctx->length); | |
| 427 if (ctx->image == NULL) { | |
| 428 return NGX_ERROR; | |
| 429 } | |
| 430 | |
| 431 ctx->last = ctx->image; | |
| 432 } | |
| 433 | |
| 434 p = ctx->last; | |
| 435 | |
| 436 for (cl = in; cl; cl = cl->next) { | |
| 437 | |
| 438 b = cl->buf; | |
| 439 size = b->last - b->pos; | |
| 440 | |
| 441 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 442 "image buf: %uz", size); | |
| 443 | |
| 444 rest = ctx->image + ctx->length - p; | |
| 445 size = (rest < size) ? rest : size; | |
| 446 | |
| 447 p = ngx_cpymem(p, b->pos, size); | |
| 448 b->pos += size; | |
| 449 | |
| 450 if (b->last_buf) { | |
| 451 ctx->last = p; | |
| 452 return NGX_OK; | |
| 453 } | |
| 454 } | |
| 455 | |
| 456 ctx->last = p; | |
| 457 r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED; | |
| 458 | |
| 459 return NGX_AGAIN; | |
| 460 } | |
| 461 | |
| 462 | |
| 463 static ngx_buf_t * | |
| 464 ngx_http_image_process(ngx_http_request_t *r) | |
| 465 { | |
| 466 ngx_int_t rc; | |
| 467 ngx_http_image_filter_ctx_t *ctx; | |
| 468 ngx_http_image_filter_conf_t *conf; | |
| 469 | |
| 470 r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED; | |
| 471 | |
| 472 ctx = ngx_http_get_module_ctx(r, ngx_http_image_filter_module); | |
| 473 | |
| 474 rc = ngx_http_image_size(r, ctx); | |
| 475 | |
| 476 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 477 | |
| 478 if (conf->filter == NGX_HTTP_IMAGE_SIZE) { | |
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479 return ngx_http_image_json(r, rc == NGX_OK ? ctx : NULL); |
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480 } |
| 2788 | 481 |
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482 ctx->max_width = ngx_http_image_filter_get_value(r, conf->wcv, conf->width); |
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483 if (ctx->max_width == 0) { |
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484 return NULL; |
| 2788 | 485 } |
| 486 | |
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487 ctx->max_height = ngx_http_image_filter_get_value(r, conf->hcv, |
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488 conf->height); |
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489 if (ctx->max_height == 0) { |
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490 return NULL; |
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491 } |
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492 |
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493 if (rc == NGX_OK |
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494 && ctx->width <= ctx->max_width |
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495 && ctx->height <= ctx->max_height) |
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496 { |
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497 return ngx_http_image_asis(r, ctx); |
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498 } |
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499 |
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500 return ngx_http_image_resize(r, ctx); |
| 2788 | 501 } |
| 502 | |
| 503 | |
| 504 static ngx_buf_t * | |
| 505 ngx_http_image_json(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 506 { | |
| 507 size_t len; | |
| 508 ngx_buf_t *b; | |
| 509 | |
| 510 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 511 if (b == NULL) { | |
| 512 return NULL; | |
| 513 } | |
| 514 | |
| 515 b->memory = 1; | |
| 516 b->last_buf = 1; | |
| 517 | |
| 518 ngx_http_clean_header(r); | |
| 519 | |
| 520 r->headers_out.status = NGX_HTTP_OK; | |
| 521 r->headers_out.content_type.len = sizeof("text/plain") - 1; | |
| 522 r->headers_out.content_type.data = (u_char *) "text/plain"; | |
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523 r->headers_out.content_type_lowcase = NULL; |
| 2788 | 524 |
| 525 if (ctx == NULL) { | |
| 526 b->pos = (u_char *) "{}" CRLF; | |
| 527 b->last = b->pos + sizeof("{}" CRLF) - 1; | |
| 528 | |
| 529 ngx_http_image_length(r, b); | |
| 530 | |
| 531 return b; | |
| 532 } | |
| 533 | |
| 534 len = sizeof("{ \"img\" : " | |
| 535 "{ \"width\": , \"height\": , \"type\": \"jpeg\" } }" CRLF) - 1 | |
| 536 + 2 * NGX_SIZE_T_LEN; | |
| 537 | |
| 538 b->pos = ngx_pnalloc(r->pool, len); | |
| 539 if (b->pos == NULL) { | |
| 540 return NULL; | |
| 541 } | |
| 542 | |
| 543 b->last = ngx_sprintf(b->pos, | |
| 544 "{ \"img\" : " | |
| 545 "{ \"width\": %uz," | |
| 546 " \"height\": %uz," | |
| 547 " \"type\": \"%s\" } }" CRLF, | |
| 548 ctx->width, ctx->height, | |
| 549 ngx_http_image_types[ctx->type - 1].data + 6); | |
| 550 | |
| 551 ngx_http_image_length(r, b); | |
| 552 | |
| 553 return b; | |
| 554 } | |
| 555 | |
| 556 | |
| 557 static ngx_buf_t * | |
| 558 ngx_http_image_asis(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 559 { | |
| 560 ngx_buf_t *b; | |
| 561 | |
| 562 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 563 if (b == NULL) { | |
| 564 return NULL; | |
| 565 } | |
| 566 | |
| 567 b->pos = ctx->image; | |
| 568 b->last = ctx->last; | |
| 569 b->memory = 1; | |
| 570 b->last_buf = 1; | |
| 571 | |
| 572 ngx_http_image_length(r, b); | |
| 573 | |
| 574 return b; | |
| 575 } | |
| 576 | |
| 577 | |
| 578 static void | |
| 579 ngx_http_image_length(ngx_http_request_t *r, ngx_buf_t *b) | |
| 580 { | |
| 581 r->headers_out.content_length_n = b->last - b->pos; | |
| 582 | |
| 583 if (r->headers_out.content_length) { | |
| 584 r->headers_out.content_length->hash = 0; | |
| 585 } | |
| 586 | |
| 587 r->headers_out.content_length = NULL; | |
| 588 } | |
| 589 | |
| 590 | |
| 591 static ngx_int_t | |
| 592 ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 593 { | |
| 594 u_char *p, *last; | |
| 595 ngx_uint_t width, height; | |
| 596 | |
| 597 p = ctx->image; | |
| 598 | |
| 599 switch (ctx->type) { | |
| 600 | |
| 601 case NGX_HTTP_IMAGE_JPEG: | |
| 602 | |
| 603 p += 2; | |
| 604 last = ctx->image + ctx->length - 10; | |
| 605 | |
| 606 while (p < last) { | |
| 607 | |
| 608 if (p[0] == 0xff && p[1] != 0xff) { | |
| 609 | |
| 610 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 611 "JPEG: %02xd %02xd", *p, *(p + 1)); | |
| 612 | |
| 613 p++; | |
| 614 | |
| 615 if (*p == 0xc0 || *p == 0xc1 || *p == 0xc2 || *p == 0xc3 | |
| 616 || *p == 0xc9 || *p == 0xca || *p == 0xcb) | |
| 617 { | |
| 618 goto found; | |
| 619 } | |
| 620 | |
| 621 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 622 "JPEG: %02xd %02xd", p[1], p[2]); | |
| 623 | |
| 624 p += p[1] * 256 + p[2]; | |
| 625 | |
| 626 continue; | |
| 627 } | |
| 628 | |
| 629 p++; | |
| 630 } | |
| 631 | |
| 632 return NGX_DECLINED; | |
| 633 | |
| 634 found: | |
| 635 | |
| 636 width = p[6] * 256 + p[7]; | |
| 637 height = p[4] * 256 + p[5]; | |
| 638 | |
| 639 break; | |
| 640 | |
| 641 case NGX_HTTP_IMAGE_GIF: | |
| 642 | |
| 643 if (ctx->length < 10) { | |
| 644 return NGX_DECLINED; | |
| 645 } | |
| 646 | |
| 647 width = p[7] * 256 + p[6]; | |
| 648 height = p[9] * 256 + p[8]; | |
| 649 | |
| 650 break; | |
| 651 | |
| 652 case NGX_HTTP_IMAGE_PNG: | |
| 653 | |
| 654 if (ctx->length < 24) { | |
| 655 return NGX_DECLINED; | |
| 656 } | |
| 657 | |
| 658 width = p[18] * 256 + p[19]; | |
| 659 height = p[22] * 256 + p[23]; | |
| 660 | |
| 661 break; | |
| 662 | |
| 663 default: | |
| 664 | |
| 665 return NGX_DECLINED; | |
| 666 } | |
| 667 | |
| 668 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 669 "image size: %d x %d", width, height); | |
| 670 | |
| 671 ctx->width = width; | |
| 672 ctx->height = height; | |
| 673 | |
| 674 return NGX_OK; | |
| 675 } | |
| 676 | |
| 677 | |
| 678 static ngx_buf_t * | |
| 679 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 680 { | |
| 681 int sx, sy, dx, dy, ox, oy, | |
| 3117 | 682 colors, transparent, red, green, blue, size; |
| 2788 | 683 u_char *out; |
| 684 ngx_buf_t *b; | |
| 685 ngx_uint_t resize; | |
| 686 gdImagePtr src, dst; | |
| 687 ngx_pool_cleanup_t *cln; | |
| 688 ngx_http_image_filter_conf_t *conf; | |
| 689 | |
| 690 src = ngx_http_image_source(r, ctx); | |
| 691 | |
| 692 if (src == NULL) { | |
| 693 return NULL; | |
| 694 } | |
| 695 | |
| 696 sx = gdImageSX(src); | |
| 697 sy = gdImageSY(src); | |
| 698 | |
| 699 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); | |
| 700 | |
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701 if ((ngx_uint_t) sx <= ctx->max_width |
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702 && (ngx_uint_t) sy <= ctx->max_height) |
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703 { |
| 2788 | 704 gdImageDestroy(src); |
| 705 return ngx_http_image_asis(r, ctx); | |
| 706 } | |
| 707 | |
| 708 colors = gdImageColorsTotal(src); | |
| 709 transparent = gdImageGetTransparent(src); | |
| 710 | |
| 3117 | 711 if (transparent != -1 && colors) { |
| 712 red = gdImageRed(src, transparent); | |
| 713 green = gdImageGreen(src, transparent); | |
| 714 blue = gdImageBlue(src, transparent); | |
| 715 gdImageColorTransparent(src, -1); | |
| 716 | |
| 717 } else { | |
| 718 red = 0; green = 0; blue = 0; | |
| 719 } | |
| 720 | |
| 2788 | 721 dx = sx; |
| 722 dy = sy; | |
| 723 | |
| 724 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { | |
| 725 | |
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726 if ((ngx_uint_t) dx > ctx->max_width) { |
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727 dy = dy * ctx->max_width / dx; |
| 2788 | 728 dy = dy ? dy : 1; |
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729 dx = ctx->max_width; |
| 2788 | 730 } |
| 731 | |
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732 if ((ngx_uint_t) dy > ctx->max_height) { |
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733 dx = dx * ctx->max_height / dy; |
| 2788 | 734 dx = dx ? dx : 1; |
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735 dy = ctx->max_height; |
| 2788 | 736 } |
| 737 | |
| 738 resize = 1; | |
| 739 | |
| 740 } else { /* NGX_HTTP_IMAGE_CROP */ | |
| 741 | |
| 742 resize = 0; | |
| 743 | |
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744 if ((ngx_uint_t) (dx * 100 / dy) |
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745 < ctx->max_width * 100 / ctx->max_height) |
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746 { |
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747 if ((ngx_uint_t) dx > ctx->max_width) { |
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748 dy = dy * ctx->max_width / dx; |
| 2788 | 749 dy = dy ? dy : 1; |
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750 dx = ctx->max_width; |
| 2788 | 751 resize = 1; |
| 752 } | |
| 753 | |
| 754 } else { | |
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755 if ((ngx_uint_t) dy > ctx->max_height) { |
|
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756 dx = dx * ctx->max_height / dy; |
| 2788 | 757 dx = dx ? dx : 1; |
|
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758 dy = ctx->max_height; |
| 2788 | 759 resize = 1; |
| 760 } | |
| 761 } | |
| 762 } | |
| 763 | |
| 764 if (resize) { | |
| 765 dst = ngx_http_image_new(r, dx, dy, colors); | |
| 766 if (dst == NULL) { | |
| 767 gdImageDestroy(src); | |
| 768 return NULL; | |
| 769 } | |
| 770 | |
| 771 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); | |
| 772 | |
| 773 gdImageDestroy(src); | |
| 774 | |
| 775 } else { | |
| 776 dst = src; | |
| 777 } | |
| 778 | |
| 779 if (conf->filter == NGX_HTTP_IMAGE_CROP) { | |
| 780 | |
| 781 src = dst; | |
| 782 | |
|
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783 if ((ngx_uint_t) dx > ctx->max_width) { |
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784 ox = dx - ctx->max_width; |
| 2788 | 785 |
| 786 } else { | |
| 787 ox = 0; | |
| 788 } | |
| 789 | |
|
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790 if ((ngx_uint_t) dy > ctx->max_height) { |
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791 oy = dy - ctx->max_height; |
| 2788 | 792 |
| 793 } else { | |
| 794 oy = 0; | |
| 795 } | |
| 796 | |
| 797 if (ox || oy) { | |
| 798 | |
| 799 dst = ngx_http_image_new(r, dx - ox, dy - oy, colors); | |
| 800 | |
| 801 if (dst == NULL) { | |
| 802 gdImageDestroy(src); | |
| 803 return NULL; | |
| 804 } | |
| 805 | |
| 806 ox /= 2; | |
| 807 oy /= 2; | |
| 808 | |
| 809 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 810 "image crop: %d x %d @ %d x %d", | |
| 811 dx, dy, ox, oy); | |
| 812 | |
| 813 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); | |
| 814 | |
| 815 gdImageDestroy(src); | |
| 816 } | |
| 817 } | |
| 818 | |
| 3117 | 819 if (transparent != -1 && colors) { |
| 820 gdImageColorTransparent(dst, gdImageColorExact(dst, red, green, blue)); | |
| 821 } | |
| 2788 | 822 |
| 823 out = ngx_http_image_out(r, ctx->type, dst, &size); | |
| 824 | |
| 825 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 826 "image: %d x %d %d", sx, sy, colors); | |
| 827 | |
| 828 gdImageDestroy(dst); | |
| 829 ngx_pfree(r->pool, ctx->image); | |
| 830 | |
| 831 if (out == NULL) { | |
| 832 return NULL; | |
| 833 } | |
| 834 | |
| 835 cln = ngx_pool_cleanup_add(r->pool, 0); | |
| 836 if (cln == NULL) { | |
| 837 gdFree(out); | |
| 838 return NULL; | |
| 839 } | |
| 840 | |
| 841 b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); | |
| 842 if (b == NULL) { | |
| 843 gdFree(out); | |
| 844 return NULL; | |
| 845 } | |
| 846 | |
| 847 cln->handler = ngx_http_image_cleanup; | |
| 848 cln->data = out; | |
| 849 | |
| 850 b->pos = out; | |
| 851 b->last = out + size; | |
| 852 b->memory = 1; | |
| 853 b->last_buf = 1; | |
| 854 | |
| 855 ngx_http_image_length(r, b); | |
| 856 | |
| 857 return b; | |
| 858 } | |
| 859 | |
| 860 | |
| 861 static gdImagePtr | |
| 862 ngx_http_image_source(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | |
| 863 { | |
| 864 char *failed; | |
| 865 gdImagePtr img; | |
| 866 | |
| 867 img = NULL; | |
| 868 | |
| 869 switch (ctx->type) { | |
| 870 | |
| 871 case NGX_HTTP_IMAGE_JPEG: | |
| 872 img = gdImageCreateFromJpegPtr(ctx->length, ctx->image); | |
| 873 failed = "gdImageCreateFromJpegPtr() failed"; | |
| 874 break; | |
| 875 | |
| 876 case NGX_HTTP_IMAGE_GIF: | |
| 877 img = gdImageCreateFromGifPtr(ctx->length, ctx->image); | |
| 878 failed = "gdImageCreateFromGifPtr() failed"; | |
| 879 break; | |
| 880 | |
| 881 case NGX_HTTP_IMAGE_PNG: | |
| 882 img = gdImageCreateFromPngPtr(ctx->length, ctx->image); | |
| 883 failed = "gdImageCreateFromPngPtr() failed"; | |
| 884 break; | |
| 885 | |
| 886 default: | |
| 887 failed = "unknown image type"; | |
| 888 break; | |
| 889 } | |
| 890 | |
| 891 if (img == NULL) { | |
| 892 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 893 } | |
| 894 | |
| 895 return img; | |
| 896 } | |
| 897 | |
| 898 | |
| 899 static gdImagePtr | |
| 900 ngx_http_image_new(ngx_http_request_t *r, int w, int h, int colors) | |
| 901 { | |
| 902 gdImagePtr img; | |
| 903 | |
| 904 if (colors == 0) { | |
| 905 img = gdImageCreateTrueColor(w, h); | |
| 906 | |
| 907 if (img == NULL) { | |
| 908 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 909 "gdImageCreateTrueColor() failed"); | |
| 910 return NULL; | |
| 911 } | |
| 912 | |
| 913 } else { | |
| 914 img = gdImageCreate(w, h); | |
| 915 | |
| 916 if (img == NULL) { | |
| 917 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 918 "gdImageCreate() failed"); | |
| 919 return NULL; | |
| 920 } | |
| 921 } | |
| 922 | |
| 923 return img; | |
| 924 } | |
| 925 | |
| 926 | |
| 927 static u_char * | |
| 928 ngx_http_image_out(ngx_http_request_t *r, ngx_uint_t type, gdImagePtr img, | |
| 929 int *size) | |
| 930 { | |
| 2848 | 931 char *failed; |
| 932 u_char *out; | |
| 933 ngx_http_image_filter_conf_t *conf; | |
| 2788 | 934 |
| 935 out = NULL; | |
| 936 | |
| 937 switch (type) { | |
| 938 | |
| 939 case NGX_HTTP_IMAGE_JPEG: | |
| 2848 | 940 conf = ngx_http_get_module_loc_conf(r, ngx_http_image_filter_module); |
| 941 out = gdImageJpegPtr(img, size, conf->jpeg_quality); | |
| 2788 | 942 failed = "gdImageJpegPtr() failed"; |
| 943 break; | |
| 944 | |
| 945 case NGX_HTTP_IMAGE_GIF: | |
| 946 out = gdImageGifPtr(img, size); | |
| 947 failed = "gdImageGifPtr() failed"; | |
| 948 break; | |
| 949 | |
| 950 case NGX_HTTP_IMAGE_PNG: | |
| 951 out = gdImagePngPtr(img, size); | |
| 952 failed = "gdImagePngPtr() failed"; | |
| 953 break; | |
| 954 | |
| 955 default: | |
| 956 failed = "unknown image type"; | |
| 957 break; | |
| 958 } | |
| 959 | |
| 960 if (out == NULL) { | |
| 961 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, failed); | |
| 962 } | |
| 963 | |
| 964 return out; | |
| 965 } | |
| 966 | |
| 967 | |
| 968 static void | |
| 969 ngx_http_image_cleanup(void *data) | |
| 970 { | |
| 971 gdFree(data); | |
| 972 } | |
| 973 | |
| 974 | |
|
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975 static ngx_uint_t |
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976 ngx_http_image_filter_get_value(ngx_http_request_t *r, |
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977 ngx_http_complex_value_t *cv, ngx_uint_t v) |
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978 { |
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979 ngx_str_t val; |
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980 |
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981 if (cv == NULL) { |
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982 return v; |
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983 } |
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984 |
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985 if (ngx_http_complex_value(r, cv, &val) != NGX_OK) { |
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986 return 0; |
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987 } |
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988 |
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989 return ngx_http_image_filter_value(&val); |
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990 } |
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|
991 |
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992 |
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993 static ngx_uint_t |
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994 ngx_http_image_filter_value(ngx_str_t *value) |
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995 { |
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996 ngx_int_t n; |
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997 |
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998 if (value->len == 1 && value->data[0] == '-') { |
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999 return (ngx_uint_t) -1; |
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1000 } |
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|
1001 |
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1002 n = ngx_atoi(value->data, value->len); |
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|
1003 |
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|
1004 if (n > 0) { |
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1005 return (ngx_uint_t) n; |
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1006 } |
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1007 |
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1008 return 0; |
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|
1009 } |
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|
1010 |
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1011 |
| 2788 | 1012 static void * |
| 1013 ngx_http_image_filter_create_conf(ngx_conf_t *cf) | |
| 1014 { | |
| 1015 ngx_http_image_filter_conf_t *conf; | |
| 1016 | |
| 1017 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_image_filter_conf_t)); | |
| 1018 if (conf == NULL) { | |
|
2912
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1019 return NULL; |
| 2788 | 1020 } |
| 1021 | |
| 1022 conf->filter = NGX_CONF_UNSET_UINT; | |
| 2848 | 1023 conf->jpeg_quality = NGX_CONF_UNSET; |
| 2788 | 1024 conf->buffer_size = NGX_CONF_UNSET_SIZE; |
| 1025 | |
| 1026 return conf; | |
| 1027 } | |
| 1028 | |
| 1029 | |
| 1030 static char * | |
| 1031 ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 1032 { | |
| 1033 ngx_http_image_filter_conf_t *prev = parent; | |
| 1034 ngx_http_image_filter_conf_t *conf = child; | |
| 1035 | |
| 1036 if (conf->filter == NGX_CONF_UNSET_UINT) { | |
| 1037 | |
| 1038 if (prev->filter == NGX_CONF_UNSET_UINT) { | |
| 1039 conf->filter = NGX_HTTP_IMAGE_OFF; | |
| 1040 | |
| 1041 } else { | |
| 1042 conf->filter = prev->filter; | |
| 1043 conf->width = prev->width; | |
| 1044 conf->height = prev->height; | |
|
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1045 conf->wcv = prev->wcv; |
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1046 conf->hcv = prev->hcv; |
| 2788 | 1047 } |
| 1048 } | |
| 1049 | |
| 2848 | 1050 /* 75 is libjpeg default quality */ |
| 1051 ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75); | |
| 1052 | |
| 2788 | 1053 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, |
| 1054 1 * 1024 * 1024); | |
| 1055 | |
| 1056 return NGX_CONF_OK; | |
| 1057 } | |
| 1058 | |
| 1059 | |
| 1060 static char * | |
| 1061 ngx_http_image_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 1062 { | |
| 1063 ngx_http_image_filter_conf_t *imcf = conf; | |
| 1064 | |
|
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1065 ngx_str_t *value; |
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1066 ngx_int_t n; |
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1067 ngx_uint_t i; |
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1068 ngx_http_complex_value_t cv; |
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1069 ngx_http_compile_complex_value_t ccv; |
| 2788 | 1070 |
| 1071 value = cf->args->elts; | |
| 1072 | |
| 1073 i = 1; | |
| 1074 | |
| 1075 if (cf->args->nelts == 2) { | |
| 1076 if (ngx_strcmp(value[i].data, "off") == 0) { | |
| 1077 imcf->filter = NGX_HTTP_IMAGE_OFF; | |
| 1078 | |
| 1079 } else if (ngx_strcmp(value[i].data, "test") == 0) { | |
| 1080 imcf->filter = NGX_HTTP_IMAGE_TEST; | |
| 1081 | |
| 1082 } else if (ngx_strcmp(value[i].data, "size") == 0) { | |
| 1083 imcf->filter = NGX_HTTP_IMAGE_SIZE; | |
| 1084 | |
| 1085 } else { | |
| 1086 goto failed; | |
| 1087 } | |
| 1088 | |
| 1089 return NGX_CONF_OK; | |
| 1090 } | |
| 1091 | |
| 1092 if (ngx_strcmp(value[i].data, "resize") == 0) { | |
| 1093 imcf->filter = NGX_HTTP_IMAGE_RESIZE; | |
| 1094 | |
| 1095 } else if (ngx_strcmp(value[i].data, "crop") == 0) { | |
| 1096 imcf->filter = NGX_HTTP_IMAGE_CROP; | |
| 1097 | |
| 1098 } else { | |
| 1099 goto failed; | |
| 1100 } | |
| 1101 | |
|
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1102 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
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1103 |
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1104 ccv.cf = cf; |
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1105 ccv.value = &value[++i]; |
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1106 ccv.complex_value = &cv; |
| 2788 | 1107 |
|
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1108 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
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1109 return NGX_CONF_ERROR; |
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1110 } |
| 2788 | 1111 |
|
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1112 if (cv.lengths == NULL) { |
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1113 n = ngx_http_image_filter_value(&value[i]); |
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1114 |
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1115 if (n == 0) { |
| 2788 | 1116 goto failed; |
| 1117 } | |
| 1118 | |
| 1119 imcf->width = (ngx_uint_t) n; | |
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1120 |
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1121 } else { |
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1122 imcf->wcv = ngx_palloc(cf->pool, sizeof(ngx_http_complex_value_t)); |
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1123 if (imcf->wcv == NULL) { |
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1124 return NGX_CONF_ERROR; |
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1125 } |
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1126 |
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1127 *imcf->wcv = cv; |
| 2788 | 1128 } |
| 1129 | |
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1130 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
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1131 |
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1132 ccv.cf = cf; |
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1133 ccv.value = &value[++i]; |
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1134 ccv.complex_value = &cv; |
| 2788 | 1135 |
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1136 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
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1137 return NGX_CONF_ERROR; |
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1138 } |
| 2788 | 1139 |
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1140 if (cv.lengths == NULL) { |
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1141 n = ngx_http_image_filter_value(&value[i]); |
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1142 |
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1143 if (n == 0) { |
| 2788 | 1144 goto failed; |
| 1145 } | |
| 1146 | |
| 1147 imcf->height = (ngx_uint_t) n; | |
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1148 |
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1149 } else { |
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1150 imcf->hcv = ngx_palloc(cf->pool, sizeof(ngx_http_complex_value_t)); |
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1151 if (imcf->hcv == NULL) { |
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1152 return NGX_CONF_ERROR; |
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1153 } |
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1154 |
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1155 *imcf->hcv = cv; |
| 2788 | 1156 } |
| 1157 | |
| 1158 return NGX_CONF_OK; | |
| 1159 | |
| 1160 failed: | |
| 1161 | |
| 1162 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", | |
| 1163 &value[i]); | |
| 1164 | |
| 1165 return NGX_CONF_ERROR; | |
| 1166 } | |
| 1167 | |
| 1168 | |
| 1169 static ngx_int_t | |
| 1170 ngx_http_image_filter_init(ngx_conf_t *cf) | |
| 1171 { | |
| 1172 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 1173 ngx_http_top_header_filter = ngx_http_image_header_filter; | |
| 1174 | |
| 1175 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 1176 ngx_http_top_body_filter = ngx_http_image_body_filter; | |
| 1177 | |
| 1178 return NGX_OK; | |
| 1179 } |