try_files

3 files changed, 263 insertions, 1 deletions

diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 3d8915767..615788811 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -489,7 +489,7 @@ ngx_http_init_phase_handlers(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf)
     use_rewrite = cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers.nelts ? 1 : 0;
     use_access = cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers.nelts ? 1 : 0;
 
-    n = use_rewrite + use_access + 1; /* find config phase */
+    n = use_rewrite + use_access + cmcf->try_files + 1 /* find config phase */;
 
     for (i = 0; i < NGX_HTTP_LOG_PHASE; i++) {
         n += cmcf->phases[i].handlers.nelts;
@@ -558,6 +558,15 @@ ngx_http_init_phase_handlers(ngx_conf_t *cf, ngx_http_core_main_conf_t *cmcf)
 
             continue;
 
+        case NGX_HTTP_TRY_FILES_PHASE:
+            if (cmcf->try_files) {
+                ph->checker = ngx_http_core_try_files_phase;
+                n++;
+                ph++;
+            }
+
+            continue;
+
         case NGX_HTTP_CONTENT_PHASE:
             checker = ngx_http_core_content_phase;
             break;
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 8c5e90873..4f2b32578 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -58,6 +58,8 @@ static char *ngx_http_core_directio(ngx_conf_t *cf, ngx_command_t *cmd,
     void *conf);
 static char *ngx_http_core_error_page(ngx_conf_t *cf, ngx_command_t *cmd,
     void *conf);
+static char *ngx_http_core_try_files(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
 static char *ngx_http_core_open_file_cache(ngx_conf_t *cf, ngx_command_t *cmd,
     void *conf);
 static char *ngx_http_core_error_log(ngx_conf_t *cf, ngx_command_t *cmd,
@@ -539,6 +541,13 @@ static ngx_command_t  ngx_http_core_commands[] = {
       0,
       NULL },
 
+    { ngx_string("try_files"),
+      NGX_HTTP_LOC_CONF|NGX_CONF_2MORE,
+      ngx_http_core_try_files,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      0,
+      NULL },
+
     { ngx_string("post_action"),
       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                         |NGX_CONF_TAKE1,
@@ -1032,6 +1041,177 @@ ngx_http_core_post_access_phase(ngx_http_request_t *r,
 
 
 ngx_int_t
+ngx_http_core_try_files_phase(ngx_http_request_t *r,
+    ngx_http_phase_handler_t *ph)
+{
+    size_t                        len, root, alias;
+    ssize_t                       reserve, allocated;
+    u_char                       *p, *name;
+    ngx_str_t                     path;
+    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_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "try files phase: %ui", r->phase_handler);
+
+    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
+
+    if (clcf->try_files == NULL) {
+        r->phase_handler++;
+        return NGX_AGAIN;
+    }
+
+    allocated = 0;
+    root = 0;
+    name = NULL;
+    path.len = 0;
+    path.data = NULL;
+
+    tf = clcf->try_files;
+
+    alias = clcf->alias ? clcf->name.len : 0;
+
+    for ( ;; ) {
+
+        if (tf->lengths) {
+            ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
+
+            e.ip = tf->lengths->elts;
+            e.request = r;
+            e.flushed = 1;
+
+            /* 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;
+        }
+
+        reserve = len - r->uri.len;
+
+        /* 16 bytes are preallocation */
+        reserve = reserve < 16 ? 16 : reserve + 16;
+
+        reserve += alias;
+
+        if (reserve > allocated) {
+
+            /* we just need to allocate path and to copy a root */
+
+            if (ngx_http_map_uri_to_path(r, &path, &root, reserve) == NULL) {
+                ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+                return NGX_OK;
+            }
+
+            name = path.data + root;
+            allocated = path.len - root - (r->uri.len - alias);
+         }
+
+        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;
+
+            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 && ngx_strncmp(name, clcf->name.data, alias) == 0) {
+                ngx_memcpy(name, name + alias, len - alias);
+                path.len -= alias;
+            }
+        }
+
+        tf++;
+
+        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                       "try to use file: \"%s\"", name);
+
+        if (tf->lengths == NULL && tf->name.len == 0) {
+
+            path.len -= root;
+            path.data += root;
+
+            if (path.data[0] == '@') {
+                (void) ngx_http_named_location(r, &path);
+
+            } else {
+                (void) ngx_http_internal_redirect(r, &path, NULL);
+            }
+
+            return NGX_OK;
+        }
+
+        ngx_memzero(&of, sizeof(ngx_open_file_info_t));
+
+        of.directio = clcf->directio;
+        of.valid = clcf->open_file_cache_valid;
+        of.min_uses = clcf->open_file_cache_min_uses;
+        of.errors = clcf->open_file_cache_errors;
+        of.events = clcf->open_file_cache_events;
+
+        if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
+            != NGX_OK)
+        {
+            if (of.err != NGX_ENOENT && of.err != NGX_ENOTDIR) {
+                ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
+                              ngx_open_file_n " \"%s\" failed", path.data);
+            }
+
+            continue;
+        }
+
+        path.len -= root;
+        path.data += root;
+
+        if (!alias) {
+            r->uri = path;
+
+        } else {
+            r->uri.len = alias + path.len;
+            r->uri.data = ngx_pnalloc(r->pool, r->uri.len);
+            if (r->uri.data == NULL) {
+                ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
+                return NGX_OK;
+            }
+
+            p = ngx_copy(r->uri.data, clcf->name.data, alias);
+            ngx_memcpy(p, name, path.len);
+        }
+
+        ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                       "try file uri: \"%V\"", &r->uri);
+
+        r->phase_handler++;
+        return NGX_AGAIN;
+    }
+
+    /* not reached */
+}
+
+
+ngx_int_t
 ngx_http_core_content_phase(ngx_http_request_t *r,
     ngx_http_phase_handler_t *ph)
 {
@@ -2710,6 +2890,7 @@ ngx_http_core_create_loc_conf(ngx_conf_t *cf)
      *     lcf->default_type = { 0, NULL };
      *     lcf->err_log = NULL;
      *     lcf->error_pages = NULL;
+     *     lcf->try_files = NULL;
      *     lcf->client_body_path = NULL;
      *     lcf->regex = NULL;
      *     lcf->exact_match = 0;
@@ -3685,6 +3866,65 @@ ngx_http_core_error_page(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 
 
 static char *
+ngx_http_core_try_files(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_http_core_loc_conf_t *clcf = conf;
+
+    ngx_str_t                  *value;
+    ngx_uint_t                  i, n;
+    ngx_http_try_file_t        *tf;
+    ngx_http_script_compile_t   sc;
+    ngx_http_core_main_conf_t  *cmcf;
+
+    if (clcf->try_files) {
+        return "is duplicate";
+    }
+
+    cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
+
+    cmcf->try_files = 1;
+
+    tf = ngx_pcalloc(cf->pool, cf->args->nelts * sizeof(ngx_http_try_file_t));
+    if (tf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    clcf->try_files = tf;
+
+    value = cf->args->elts;
+
+    for (i = 0; i < cf->args->nelts - 1; i++) {
+
+        tf[i].name = value[i + 1];
+
+        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++;
+        }
+    }
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
 ngx_http_core_open_file_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 {
     ngx_http_core_loc_conf_t *lcf = conf;
diff --git a/src/http/ngx_http_core_module.h b/src/http/ngx_http_core_module.h
index 032d07a6b..5be856123 100644
--- a/src/http/ngx_http_core_module.h
+++ b/src/http/ngx_http_core_module.h
@@ -81,6 +81,7 @@ typedef enum {
     NGX_HTTP_ACCESS_PHASE,
     NGX_HTTP_POST_ACCESS_PHASE,
 
+    NGX_HTTP_TRY_FILES_PHASE,
     NGX_HTTP_CONTENT_PHASE,
 
     NGX_HTTP_LOG_PHASE
@@ -129,6 +130,8 @@ typedef struct {
 
     ngx_hash_keys_arrays_t    *variables_keys;
 
+    ngx_uint_t                 try_files;       /* unsigned  try_files:1 */
+
     ngx_http_phase_t           phases[NGX_HTTP_LOG_PHASE + 1];
 } ngx_http_core_main_conf_t;
 
@@ -238,6 +241,13 @@ typedef struct {
 } ngx_http_err_page_t;
 
 
+typedef struct {
+    ngx_array_t               *lengths;
+    ngx_array_t               *values;
+    ngx_str_t                  name;
+} ngx_http_try_file_t;
+
+
 struct ngx_http_core_loc_conf_s {
     ngx_str_t     name;          /* location name */
 
@@ -328,6 +338,7 @@ struct ngx_http_core_loc_conf_s {
 #endif
 
     ngx_array_t  *error_pages;             /* error_page */
+    ngx_http_try_file_t    *try_files;     /* try_files */
 
     ngx_path_t   *client_body_temp_path;   /* client_body_temp_path */
 
@@ -386,6 +397,8 @@ ngx_int_t ngx_http_core_access_phase(ngx_http_request_t *r,
     ngx_http_phase_handler_t *ph);
 ngx_int_t ngx_http_core_post_access_phase(ngx_http_request_t *r,
     ngx_http_phase_handler_t *ph);
+ngx_int_t ngx_http_core_try_files_phase(ngx_http_request_t *r,
+    ngx_http_phase_handler_t *ph);
 ngx_int_t ngx_http_core_content_phase(ngx_http_request_t *r,
     ngx_http_phase_handler_t *ph);