diff options
Diffstat (limited to 'nginx/src/http/modules/ngx_http_try_files_module.c')
| -rw-r--r-- | nginx/src/http/modules/ngx_http_try_files_module.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/nginx/src/http/modules/ngx_http_try_files_module.c b/nginx/src/http/modules/ngx_http_try_files_module.c new file mode 100644 index 0000000..ce783a2 --- /dev/null +++ b/nginx/src/http/modules/ngx_http_try_files_module.c @@ -0,0 +1,404 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +typedef struct { + ngx_array_t *lengths; + ngx_array_t *values; + ngx_str_t name; + + unsigned code:10; + unsigned test_dir:1; +} ngx_http_try_file_t; + + +typedef struct { + ngx_http_try_file_t *try_files; +} ngx_http_try_files_loc_conf_t; + + +static ngx_int_t ngx_http_try_files_handler(ngx_http_request_t *r); +static char *ngx_http_try_files(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); +static void *ngx_http_try_files_create_loc_conf(ngx_conf_t *cf); +static ngx_int_t ngx_http_try_files_init(ngx_conf_t *cf); + + +static ngx_command_t ngx_http_try_files_commands[] = { + + { ngx_string("try_files"), + NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_2MORE, + ngx_http_try_files, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + NULL }, + + ngx_null_command +}; + + +static ngx_http_module_t ngx_http_try_files_module_ctx = { + NULL, /* preconfiguration */ + ngx_http_try_files_init, /* postconfiguration */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + ngx_http_try_files_create_loc_conf, /* create location configuration */ + NULL /* merge location configuration */ +}; + + +ngx_module_t ngx_http_try_files_module = { + NGX_MODULE_V1, + &ngx_http_try_files_module_ctx, /* module context */ + ngx_http_try_files_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + NULL, /* init master */ + NULL, /* init module */ + NULL, /* init process */ + NULL, /* init thread */ + NULL, /* exit thread */ + NULL, /* exit process */ + NULL, /* exit master */ + NGX_MODULE_V1_PADDING +}; + + +static ngx_int_t +ngx_http_try_files_handler(ngx_http_request_t *r) +{ + size_t len, root, alias, reserve, allocated; + u_char *p, *name; + ngx_str_t path, args; + ngx_uint_t test_dir; + ngx_http_try_file_t *tf; + ngx_open_file_info_t of; + ngx_http_script_code_pt code; + ngx_http_script_engine_t e; + ngx_http_core_loc_conf_t *clcf; + ngx_http_script_len_code_pt lcode; + ngx_http_try_files_loc_conf_t *tlcf; + + tlcf = ngx_http_get_module_loc_conf(r, ngx_http_try_files_module); + + if (tlcf->try_files == NULL) { + return NGX_DECLINED; + } + + ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "try files handler"); + + allocated = 0; + root = 0; + name = NULL; + /* suppress MSVC warning */ + path.data = NULL; + + tf = tlcf->try_files; + + clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); + + alias = clcf->alias; + + for ( ;; ) { + + if (tf->lengths) { + ngx_memzero(&e, sizeof(ngx_http_script_engine_t)); + + e.ip = tf->lengths->elts; + e.request = r; + + /* 1 is for terminating '\0' as in static names */ + len = 1; + + while (*(uintptr_t *) e.ip) { + lcode = *(ngx_http_script_len_code_pt *) e.ip; + len += lcode(&e); + } + + } else { + len = tf->name.len; + } + + if (!alias) { + reserve = len > r->uri.len ? len - r->uri.len : 0; + + } else if (alias == NGX_MAX_SIZE_T_VALUE) { + reserve = len; + + } else { + reserve = len > r->uri.len - alias ? len - (r->uri.len - alias) : 0; + } + + if (reserve > allocated || !allocated) { + + /* 16 bytes are preallocation */ + allocated = reserve + 16; + + if (ngx_http_map_uri_to_path(r, &path, &root, allocated) == NULL) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + name = path.data + root; + } + + if (tf->values == NULL) { + + /* tf->name.len includes the terminating '\0' */ + + ngx_memcpy(name, tf->name.data, tf->name.len); + + path.len = (name + tf->name.len - 1) - path.data; + + } else { + e.ip = tf->values->elts; + e.pos = name; + e.flushed = 1; + + while (*(uintptr_t *) e.ip) { + code = *(ngx_http_script_code_pt *) e.ip; + code((ngx_http_script_engine_t *) &e); + } + + path.len = e.pos - path.data; + + *e.pos = '\0'; + + if (alias && alias != NGX_MAX_SIZE_T_VALUE + && ngx_strncmp(name, r->uri.data, alias) == 0) + { + ngx_memmove(name, name + alias, len - alias); + path.len -= alias; + } + } + + test_dir = tf->test_dir; + + tf++; + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "trying to use %s: \"%s\" \"%s\"", + test_dir ? "dir" : "file", name, path.data); + + if (tf->lengths == NULL && tf->name.len == 0) { + + if (tf->code) { + return tf->code; + } + + path.len -= root; + path.data += root; + + if (path.data[0] == '@') { + (void) ngx_http_named_location(r, &path); + + } else { + ngx_http_split_args(r, &path, &args); + + (void) ngx_http_internal_redirect(r, &path, &args); + } + + ngx_http_finalize_request(r, NGX_DONE); + return NGX_DONE; + } + + ngx_memzero(&of, sizeof(ngx_open_file_info_t)); + + of.read_ahead = clcf->read_ahead; + of.directio = clcf->directio; + of.valid = clcf->open_file_cache_valid; + of.min_uses = clcf->open_file_cache_min_uses; + of.test_only = 1; + of.errors = clcf->open_file_cache_errors; + of.events = clcf->open_file_cache_events; + + if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool) + != NGX_OK) + { + if (of.err == 0) { + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + if (of.err != NGX_ENOENT + && of.err != NGX_ENOTDIR + && of.err != NGX_ENAMETOOLONG) + { + ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err, + "%s \"%s\" failed", of.failed, path.data); + } + + continue; + } + + if (of.is_dir != test_dir) { + continue; + } + + path.len -= root; + path.data += root; + + if (!alias) { + r->uri = path; + + } else if (alias == NGX_MAX_SIZE_T_VALUE) { + if (!test_dir) { + r->uri = path; + r->add_uri_to_alias = 1; + } + + } else { + name = r->uri.data; + + r->uri.len = alias + path.len; + r->uri.data = ngx_pnalloc(r->pool, r->uri.len); + if (r->uri.data == NULL) { + r->uri.len = 0; + return NGX_HTTP_INTERNAL_SERVER_ERROR; + } + + p = ngx_copy(r->uri.data, name, alias); + ngx_memcpy(p, path.data, path.len); + } + + ngx_http_set_exten(r); + + ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "try file uri: \"%V\"", &r->uri); + + return NGX_DECLINED; + } + + /* not reached */ +} + + +static char * +ngx_http_try_files(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) +{ + ngx_http_try_files_loc_conf_t *tlcf = conf; + + ngx_str_t *value; + ngx_int_t code; + ngx_uint_t i, n; + ngx_http_try_file_t *tf; + ngx_http_script_compile_t sc; + + if (tlcf->try_files) { + return "is duplicate"; + } + + tf = ngx_pcalloc(cf->pool, cf->args->nelts * sizeof(ngx_http_try_file_t)); + if (tf == NULL) { + return NGX_CONF_ERROR; + } + + tlcf->try_files = tf; + + value = cf->args->elts; + + for (i = 0; i < cf->args->nelts - 1; i++) { + + tf[i].name = value[i + 1]; + + if (tf[i].name.len > 0 + && tf[i].name.data[tf[i].name.len - 1] == '/' + && i + 2 < cf->args->nelts) + { + tf[i].test_dir = 1; + tf[i].name.len--; + tf[i].name.data[tf[i].name.len] = '\0'; + } + + n = ngx_http_script_variables_count(&tf[i].name); + + if (n) { + ngx_memzero(&sc, sizeof(ngx_http_script_compile_t)); + + sc.cf = cf; + sc.source = &tf[i].name; + sc.lengths = &tf[i].lengths; + sc.values = &tf[i].values; + sc.variables = n; + sc.complete_lengths = 1; + sc.complete_values = 1; + + if (ngx_http_script_compile(&sc) != NGX_OK) { + return NGX_CONF_ERROR; + } + + } else { + /* add trailing '\0' to length */ + tf[i].name.len++; + } + } + + if (tf[i - 1].name.data[0] == '=') { + + code = ngx_atoi(tf[i - 1].name.data + 1, tf[i - 1].name.len - 2); + + if (code == NGX_ERROR || code > 999) { + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, + "invalid code \"%*s\"", + tf[i - 1].name.len - 1, tf[i - 1].name.data); + return NGX_CONF_ERROR; + } + + tf[i].code = code; + } + + return NGX_CONF_OK; +} + + +static void * +ngx_http_try_files_create_loc_conf(ngx_conf_t *cf) +{ + ngx_http_try_files_loc_conf_t *tlcf; + + tlcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_try_files_loc_conf_t)); + if (tlcf == NULL) { + return NULL; + } + + /* + * set by ngx_pcalloc(): + * + * tlcf->try_files = NULL; + */ + + return tlcf; +} + + +static ngx_int_t +ngx_http_try_files_init(ngx_conf_t *cf) +{ + ngx_http_handler_pt *h; + ngx_http_core_main_conf_t *cmcf; + + cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); + + h = ngx_array_push(&cmcf->phases[NGX_HTTP_PRECONTENT_PHASE].handlers); + if (h == NULL) { + return NGX_ERROR; + } + + *h = ngx_http_try_files_handler; + + return NGX_OK; +} |