Mercurial > hg > nginx
annotate src/http/modules/ngx_http_slice_filter_module.c @ 7684:32a343635b50
Slice filter: clear original Accept-Ranges.
The slice filter allows ranges for the response by setting the r->allow_ranges
flag, which enables the range filter. If the range was not requested, the
range filter adds an Accept-Ranges header to the response to signal the
support for ranges.
Previously, if an Accept-Ranges header was already present in the first slice
response, client received two copies of this header. Now, the slice filter
removes the Accept-Ranges header from the response prior to setting the
r->allow_ranges flag.
| author | Roman Arutyunyan <arut@nginx.com> |
|---|---|
| date | Thu, 09 Jul 2020 16:21:37 +0300 |
| parents | f583559aadc7 |
| children |
| rev | line source |
|---|---|
| 6317 | 1 |
| 2 /* | |
| 3 * Copyright (C) Roman Arutyunyan | |
| 4 * Copyright (C) Nginx, Inc. | |
| 5 */ | |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_http.h> | |
| 11 | |
| 12 | |
| 13 typedef struct { | |
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14 size_t size; |
| 6317 | 15 } ngx_http_slice_loc_conf_t; |
| 16 | |
| 17 | |
| 18 typedef struct { | |
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19 off_t start; |
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20 off_t end; |
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21 ngx_str_t range; |
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22 ngx_str_t etag; |
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23 unsigned last:1; |
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24 unsigned active:1; |
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25 ngx_http_request_t *sr; |
| 6317 | 26 } ngx_http_slice_ctx_t; |
| 27 | |
| 28 | |
| 29 typedef struct { | |
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30 off_t start; |
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31 off_t end; |
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32 off_t complete_length; |
| 6317 | 33 } ngx_http_slice_content_range_t; |
| 34 | |
| 35 | |
| 36 static ngx_int_t ngx_http_slice_header_filter(ngx_http_request_t *r); | |
| 37 static ngx_int_t ngx_http_slice_body_filter(ngx_http_request_t *r, | |
| 38 ngx_chain_t *in); | |
| 39 static ngx_int_t ngx_http_slice_parse_content_range(ngx_http_request_t *r, | |
| 40 ngx_http_slice_content_range_t *cr); | |
| 41 static ngx_int_t ngx_http_slice_range_variable(ngx_http_request_t *r, | |
| 42 ngx_http_variable_value_t *v, uintptr_t data); | |
| 43 static off_t ngx_http_slice_get_start(ngx_http_request_t *r); | |
| 44 static void *ngx_http_slice_create_loc_conf(ngx_conf_t *cf); | |
| 45 static char *ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, | |
| 46 void *child); | |
| 47 static ngx_int_t ngx_http_slice_add_variables(ngx_conf_t *cf); | |
| 48 static ngx_int_t ngx_http_slice_init(ngx_conf_t *cf); | |
| 49 | |
| 50 | |
| 51 static ngx_command_t ngx_http_slice_filter_commands[] = { | |
| 52 | |
| 53 { ngx_string("slice"), | |
| 54 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 55 ngx_conf_set_size_slot, | |
| 56 NGX_HTTP_LOC_CONF_OFFSET, | |
| 57 offsetof(ngx_http_slice_loc_conf_t, size), | |
| 58 NULL }, | |
| 59 | |
| 60 ngx_null_command | |
| 61 }; | |
| 62 | |
| 63 | |
| 64 static ngx_http_module_t ngx_http_slice_filter_module_ctx = { | |
| 65 ngx_http_slice_add_variables, /* preconfiguration */ | |
| 66 ngx_http_slice_init, /* postconfiguration */ | |
| 67 | |
| 68 NULL, /* create main configuration */ | |
| 69 NULL, /* init main configuration */ | |
| 70 | |
| 71 NULL, /* create server configuration */ | |
| 72 NULL, /* merge server configuration */ | |
| 73 | |
| 74 ngx_http_slice_create_loc_conf, /* create location configuration */ | |
| 75 ngx_http_slice_merge_loc_conf /* merge location configuration */ | |
| 76 }; | |
| 77 | |
| 78 | |
| 79 ngx_module_t ngx_http_slice_filter_module = { | |
| 80 NGX_MODULE_V1, | |
| 81 &ngx_http_slice_filter_module_ctx, /* module context */ | |
| 82 ngx_http_slice_filter_commands, /* module directives */ | |
| 83 NGX_HTTP_MODULE, /* module type */ | |
| 84 NULL, /* init master */ | |
| 85 NULL, /* init module */ | |
| 86 NULL, /* init process */ | |
| 87 NULL, /* init thread */ | |
| 88 NULL, /* exit thread */ | |
| 89 NULL, /* exit process */ | |
| 90 NULL, /* exit master */ | |
| 91 NGX_MODULE_V1_PADDING | |
| 92 }; | |
| 93 | |
| 94 | |
| 95 static ngx_str_t ngx_http_slice_range_name = ngx_string("slice_range"); | |
| 96 | |
| 97 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; | |
| 98 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; | |
| 99 | |
| 100 | |
| 101 static ngx_int_t | |
| 102 ngx_http_slice_header_filter(ngx_http_request_t *r) | |
| 103 { | |
| 104 off_t end; | |
| 105 ngx_int_t rc; | |
| 106 ngx_table_elt_t *h; | |
| 107 ngx_http_slice_ctx_t *ctx; | |
| 108 ngx_http_slice_loc_conf_t *slcf; | |
| 109 ngx_http_slice_content_range_t cr; | |
| 110 | |
| 111 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
| 112 if (ctx == NULL) { | |
| 113 return ngx_http_next_header_filter(r); | |
| 114 } | |
| 115 | |
| 116 if (r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT) { | |
| 117 if (r == r->main) { | |
| 118 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module); | |
| 119 return ngx_http_next_header_filter(r); | |
| 120 } | |
| 121 | |
| 122 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 123 "unexpected status code %ui in slice response", | |
| 124 r->headers_out.status); | |
| 125 return NGX_ERROR; | |
| 126 } | |
| 127 | |
| 128 h = r->headers_out.etag; | |
| 129 | |
| 130 if (ctx->etag.len) { | |
| 131 if (h == NULL | |
| 132 || h->value.len != ctx->etag.len | |
| 133 || ngx_strncmp(h->value.data, ctx->etag.data, ctx->etag.len) | |
| 134 != 0) | |
| 135 { | |
| 136 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 137 "etag mismatch in slice response"); | |
| 138 return NGX_ERROR; | |
| 139 } | |
| 140 } | |
| 141 | |
| 142 if (h) { | |
| 143 ctx->etag = h->value; | |
| 144 } | |
| 145 | |
| 146 if (ngx_http_slice_parse_content_range(r, &cr) != NGX_OK) { | |
| 147 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 148 "invalid range in slice response"); | |
| 149 return NGX_ERROR; | |
| 150 } | |
| 151 | |
| 152 if (cr.complete_length == -1) { | |
| 153 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 154 "no complete length in slice response"); | |
| 155 return NGX_ERROR; | |
| 156 } | |
| 157 | |
| 158 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 159 "http slice response range: %O-%O/%O", | |
| 160 cr.start, cr.end, cr.complete_length); | |
| 161 | |
| 162 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
| 163 | |
| 164 end = ngx_min(cr.start + (off_t) slcf->size, cr.complete_length); | |
| 165 | |
| 166 if (cr.start != ctx->start || cr.end != end) { | |
| 167 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, | |
| 168 "unexpected range in slice response: %O-%O", | |
| 169 cr.start, cr.end); | |
| 170 return NGX_ERROR; | |
| 171 } | |
| 172 | |
| 173 ctx->start = end; | |
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174 ctx->active = 1; |
| 6317 | 175 |
| 176 r->headers_out.status = NGX_HTTP_OK; | |
| 177 r->headers_out.status_line.len = 0; | |
| 178 r->headers_out.content_length_n = cr.complete_length; | |
| 179 r->headers_out.content_offset = cr.start; | |
| 180 r->headers_out.content_range->hash = 0; | |
| 181 r->headers_out.content_range = NULL; | |
| 182 | |
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183 if (r->headers_out.accept_ranges) { |
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184 r->headers_out.accept_ranges->hash = 0; |
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185 r->headers_out.accept_ranges = NULL; |
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186 } |
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187 |
| 6317 | 188 r->allow_ranges = 1; |
| 189 r->subrequest_ranges = 1; | |
| 190 r->single_range = 1; | |
| 191 | |
| 192 rc = ngx_http_next_header_filter(r); | |
| 193 | |
| 194 if (r != r->main) { | |
| 195 return rc; | |
| 196 } | |
| 197 | |
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198 r->preserve_body = 1; |
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199 |
| 6317 | 200 if (r->headers_out.status == NGX_HTTP_PARTIAL_CONTENT) { |
| 201 if (ctx->start + (off_t) slcf->size <= r->headers_out.content_offset) { | |
| 202 ctx->start = slcf->size | |
| 203 * (r->headers_out.content_offset / slcf->size); | |
| 204 } | |
| 205 | |
| 206 ctx->end = r->headers_out.content_offset | |
| 207 + r->headers_out.content_length_n; | |
| 208 | |
| 209 } else { | |
| 210 ctx->end = cr.complete_length; | |
| 211 } | |
| 212 | |
| 213 return rc; | |
| 214 } | |
| 215 | |
| 216 | |
| 217 static ngx_int_t | |
| 218 ngx_http_slice_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
| 219 { | |
| 220 ngx_int_t rc; | |
| 221 ngx_chain_t *cl; | |
| 222 ngx_http_slice_ctx_t *ctx; | |
| 223 ngx_http_slice_loc_conf_t *slcf; | |
| 224 | |
| 225 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
| 226 | |
| 227 if (ctx == NULL || r != r->main) { | |
| 228 return ngx_http_next_body_filter(r, in); | |
| 229 } | |
| 230 | |
| 231 for (cl = in; cl; cl = cl->next) { | |
| 232 if (cl->buf->last_buf) { | |
| 233 cl->buf->last_buf = 0; | |
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234 cl->buf->last_in_chain = 1; |
| 6317 | 235 cl->buf->sync = 1; |
| 236 ctx->last = 1; | |
| 237 } | |
| 238 } | |
| 239 | |
| 240 rc = ngx_http_next_body_filter(r, in); | |
| 241 | |
| 242 if (rc == NGX_ERROR || !ctx->last) { | |
| 243 return rc; | |
| 244 } | |
| 245 | |
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246 if (ctx->sr && !ctx->sr->done) { |
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247 return rc; |
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248 } |
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249 |
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250 if (!ctx->active) { |
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251 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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252 "missing slice response"); |
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253 return NGX_ERROR; |
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254 } |
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255 |
| 6317 | 256 if (ctx->start >= ctx->end) { |
| 257 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module); | |
| 258 ngx_http_send_special(r, NGX_HTTP_LAST); | |
| 259 return rc; | |
| 260 } | |
| 261 | |
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262 if (r->buffered) { |
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263 return rc; |
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264 } |
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265 |
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266 if (ngx_http_subrequest(r, &r->uri, &r->args, &ctx->sr, NULL, |
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267 NGX_HTTP_SUBREQUEST_CLONE) |
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268 != NGX_OK) |
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269 { |
| 6317 | 270 return NGX_ERROR; |
| 271 } | |
| 272 | |
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273 ngx_http_set_ctx(ctx->sr, ctx, ngx_http_slice_filter_module); |
| 6317 | 274 |
| 275 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
| 276 | |
| 277 ctx->range.len = ngx_sprintf(ctx->range.data, "bytes=%O-%O", ctx->start, | |
| 278 ctx->start + (off_t) slcf->size - 1) | |
| 279 - ctx->range.data; | |
| 280 | |
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281 ctx->active = 0; |
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282 |
| 6317 | 283 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 284 "http slice subrequest: \"%V\"", &ctx->range); | |
| 285 | |
| 286 return rc; | |
| 287 } | |
| 288 | |
| 289 | |
| 290 static ngx_int_t | |
| 291 ngx_http_slice_parse_content_range(ngx_http_request_t *r, | |
| 292 ngx_http_slice_content_range_t *cr) | |
| 293 { | |
| 294 off_t start, end, complete_length, cutoff, cutlim; | |
| 295 u_char *p; | |
| 296 ngx_table_elt_t *h; | |
| 297 | |
| 298 h = r->headers_out.content_range; | |
| 299 | |
| 300 if (h == NULL | |
| 301 || h->value.len < 7 | |
| 302 || ngx_strncmp(h->value.data, "bytes ", 6) != 0) | |
| 303 { | |
| 304 return NGX_ERROR; | |
| 305 } | |
| 306 | |
| 307 p = h->value.data + 6; | |
| 308 | |
| 309 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
| 310 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
| 311 | |
| 312 start = 0; | |
| 313 end = 0; | |
| 314 complete_length = 0; | |
| 315 | |
| 316 while (*p == ' ') { p++; } | |
| 317 | |
| 318 if (*p < '0' || *p > '9') { | |
| 319 return NGX_ERROR; | |
| 320 } | |
| 321 | |
| 322 while (*p >= '0' && *p <= '9') { | |
| 323 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
| 324 return NGX_ERROR; | |
| 325 } | |
| 326 | |
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327 start = start * 10 + (*p++ - '0'); |
| 6317 | 328 } |
| 329 | |
| 330 while (*p == ' ') { p++; } | |
| 331 | |
| 332 if (*p++ != '-') { | |
| 333 return NGX_ERROR; | |
| 334 } | |
| 335 | |
| 336 while (*p == ' ') { p++; } | |
| 337 | |
| 338 if (*p < '0' || *p > '9') { | |
| 339 return NGX_ERROR; | |
| 340 } | |
| 341 | |
| 342 while (*p >= '0' && *p <= '9') { | |
| 343 if (end >= cutoff && (end > cutoff || *p - '0' > cutlim)) { | |
| 344 return NGX_ERROR; | |
| 345 } | |
| 346 | |
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347 end = end * 10 + (*p++ - '0'); |
| 6317 | 348 } |
| 349 | |
| 350 end++; | |
| 351 | |
| 352 while (*p == ' ') { p++; } | |
| 353 | |
| 354 if (*p++ != '/') { | |
| 355 return NGX_ERROR; | |
| 356 } | |
| 357 | |
| 358 while (*p == ' ') { p++; } | |
| 359 | |
| 360 if (*p != '*') { | |
| 361 if (*p < '0' || *p > '9') { | |
| 362 return NGX_ERROR; | |
| 363 } | |
| 364 | |
| 365 while (*p >= '0' && *p <= '9') { | |
| 366 if (complete_length >= cutoff | |
| 367 && (complete_length > cutoff || *p - '0' > cutlim)) | |
| 368 { | |
| 369 return NGX_ERROR; | |
| 370 } | |
| 371 | |
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372 complete_length = complete_length * 10 + (*p++ - '0'); |
| 6317 | 373 } |
| 374 | |
| 375 } else { | |
| 376 complete_length = -1; | |
| 377 p++; | |
| 378 } | |
| 379 | |
| 380 while (*p == ' ') { p++; } | |
| 381 | |
| 382 if (*p != '\0') { | |
| 383 return NGX_ERROR; | |
| 384 } | |
| 385 | |
| 386 cr->start = start; | |
| 387 cr->end = end; | |
| 388 cr->complete_length = complete_length; | |
| 389 | |
| 390 return NGX_OK; | |
| 391 } | |
| 392 | |
| 393 | |
| 394 static ngx_int_t | |
| 395 ngx_http_slice_range_variable(ngx_http_request_t *r, | |
| 396 ngx_http_variable_value_t *v, uintptr_t data) | |
| 397 { | |
| 398 u_char *p; | |
| 399 ngx_http_slice_ctx_t *ctx; | |
| 400 ngx_http_slice_loc_conf_t *slcf; | |
| 401 | |
| 402 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module); | |
| 403 | |
| 404 if (ctx == NULL) { | |
| 405 if (r != r->main || r->headers_out.status) { | |
| 406 v->not_found = 1; | |
| 407 return NGX_OK; | |
| 408 } | |
| 409 | |
| 410 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module); | |
| 411 | |
| 412 if (slcf->size == 0) { | |
| 413 v->not_found = 1; | |
| 414 return NGX_OK; | |
| 415 } | |
| 416 | |
| 417 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_slice_ctx_t)); | |
| 418 if (ctx == NULL) { | |
| 419 return NGX_ERROR; | |
| 420 } | |
| 421 | |
| 422 ngx_http_set_ctx(r, ctx, ngx_http_slice_filter_module); | |
| 423 | |
| 424 p = ngx_pnalloc(r->pool, sizeof("bytes=-") - 1 + 2 * NGX_OFF_T_LEN); | |
| 425 if (p == NULL) { | |
| 426 return NGX_ERROR; | |
| 427 } | |
| 428 | |
| 429 ctx->start = slcf->size * (ngx_http_slice_get_start(r) / slcf->size); | |
| 430 | |
| 431 ctx->range.data = p; | |
| 432 ctx->range.len = ngx_sprintf(p, "bytes=%O-%O", ctx->start, | |
| 433 ctx->start + (off_t) slcf->size - 1) | |
| 434 - p; | |
| 435 } | |
| 436 | |
| 437 v->data = ctx->range.data; | |
| 438 v->valid = 1; | |
| 439 v->not_found = 0; | |
| 440 v->no_cacheable = 1; | |
| 441 v->len = ctx->range.len; | |
| 442 | |
| 443 return NGX_OK; | |
| 444 } | |
| 445 | |
| 446 | |
| 447 static off_t | |
| 448 ngx_http_slice_get_start(ngx_http_request_t *r) | |
| 449 { | |
| 450 off_t start, cutoff, cutlim; | |
| 451 u_char *p; | |
| 452 ngx_table_elt_t *h; | |
| 453 | |
| 454 if (r->headers_in.if_range) { | |
| 455 return 0; | |
| 456 } | |
| 457 | |
| 458 h = r->headers_in.range; | |
| 459 | |
| 460 if (h == NULL | |
| 461 || h->value.len < 7 | |
| 462 || ngx_strncasecmp(h->value.data, (u_char *) "bytes=", 6) != 0) | |
| 463 { | |
| 464 return 0; | |
| 465 } | |
| 466 | |
| 467 p = h->value.data + 6; | |
| 468 | |
| 469 if (ngx_strchr(p, ',')) { | |
| 470 return 0; | |
| 471 } | |
| 472 | |
| 473 while (*p == ' ') { p++; } | |
| 474 | |
| 475 if (*p == '-') { | |
| 476 return 0; | |
| 477 } | |
| 478 | |
| 479 cutoff = NGX_MAX_OFF_T_VALUE / 10; | |
| 480 cutlim = NGX_MAX_OFF_T_VALUE % 10; | |
| 481 | |
| 482 start = 0; | |
| 483 | |
| 484 while (*p >= '0' && *p <= '9') { | |
| 485 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) { | |
| 486 return 0; | |
| 487 } | |
| 488 | |
|
7067
e3723f2a11b7
Parenthesized ASCII-related calculations.
Valentin Bartenev <vbart@nginx.com>
parents:
6963
diff
changeset
|
489 start = start * 10 + (*p++ - '0'); |
| 6317 | 490 } |
| 491 | |
| 492 return start; | |
| 493 } | |
| 494 | |
| 495 | |
| 496 static void * | |
| 497 ngx_http_slice_create_loc_conf(ngx_conf_t *cf) | |
| 498 { | |
| 499 ngx_http_slice_loc_conf_t *slcf; | |
| 500 | |
| 501 slcf = ngx_palloc(cf->pool, sizeof(ngx_http_slice_loc_conf_t)); | |
| 502 if (slcf == NULL) { | |
| 503 return NULL; | |
| 504 } | |
| 505 | |
| 506 slcf->size = NGX_CONF_UNSET_SIZE; | |
| 507 | |
| 508 return slcf; | |
| 509 } | |
| 510 | |
| 511 | |
| 512 static char * | |
| 513 ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 514 { | |
| 515 ngx_http_slice_loc_conf_t *prev = parent; | |
| 516 ngx_http_slice_loc_conf_t *conf = child; | |
| 517 | |
| 518 ngx_conf_merge_size_value(conf->size, prev->size, 0); | |
| 519 | |
| 520 return NGX_CONF_OK; | |
| 521 } | |
| 522 | |
| 523 | |
| 524 static ngx_int_t | |
| 525 ngx_http_slice_add_variables(ngx_conf_t *cf) | |
| 526 { | |
| 527 ngx_http_variable_t *var; | |
| 528 | |
| 529 var = ngx_http_add_variable(cf, &ngx_http_slice_range_name, 0); | |
| 530 if (var == NULL) { | |
| 531 return NGX_ERROR; | |
| 532 } | |
| 533 | |
| 534 var->get_handler = ngx_http_slice_range_variable; | |
| 535 | |
| 536 return NGX_OK; | |
| 537 } | |
| 538 | |
| 539 | |
| 540 static ngx_int_t | |
| 541 ngx_http_slice_init(ngx_conf_t *cf) | |
| 542 { | |
| 543 ngx_http_next_header_filter = ngx_http_top_header_filter; | |
| 544 ngx_http_top_header_filter = ngx_http_slice_header_filter; | |
| 545 | |
| 546 ngx_http_next_body_filter = ngx_http_top_body_filter; | |
| 547 ngx_http_top_body_filter = ngx_http_slice_body_filter; | |
| 548 | |
| 549 return NGX_OK; | |
| 550 } |