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ngx_http_gridfs_module.c
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/*
* Copyright 2009-2010 Michael Dirolf
*
* Dual Licensed under the Apache License, Version 2.0 and the GNU
* General Public License, version 2 or (at your option) any later
* version.
*
* -- Apache License
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* -- GNU GPL
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* TODO range support http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include "mongo-c-driver/src/mongo.h"
#include "mongo-c-driver/src/gridfs.h"
#include <signal.h>
#include <stdio.h>
#define MONGO_MAX_RETRIES_PER_REQUEST 1
#define MONGO_RECONNECT_WAITTIME 500 //ms
#define TRUE 1
#define FALSE 0
/* Parse config directive */
static char * ngx_http_mongo(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy);
/* Parse config directive */
static char* ngx_http_gridfs(ngx_conf_t* directive, ngx_command_t* command, void* gridfs_conf);
static void* ngx_http_gridfs_create_main_conf(ngx_conf_t* directive);
static void* ngx_http_gridfs_create_loc_conf(ngx_conf_t* directive);
static char* ngx_http_gridfs_merge_loc_conf(ngx_conf_t* directive, void* parent, void* child);
static ngx_int_t ngx_http_gridfs_init_worker(ngx_cycle_t* cycle);
static ngx_int_t ngx_http_gridfs_handler(ngx_http_request_t* request);
static void ngx_http_gridfs_cleanup(void* data);
typedef struct {
ngx_str_t db;
ngx_str_t root_collection;
ngx_str_t field;
ngx_uint_t type;
ngx_str_t user;
ngx_str_t pass;
ngx_str_t mongo;
ngx_array_t* mongods; /* ngx_http_mongod_server_t */
ngx_str_t replset; /* Name of the replica set, if connecting. */
} ngx_http_gridfs_loc_conf_t;
typedef struct {
ngx_str_t db;
ngx_str_t user;
ngx_str_t pass;
} ngx_http_mongo_auth_t;
typedef struct {
ngx_str_t name;
mongo conn;
ngx_array_t *auths; /* ngx_http_mongo_auth_t */
} ngx_http_mongo_connection_t;
/* Maybe we should store a list of addresses instead. */
typedef struct {
ngx_str_t host;
in_port_t port;
} ngx_http_mongod_server_t;
typedef struct {
ngx_array_t loc_confs; /* ngx_http_gridfs_loc_conf_t */
} ngx_http_gridfs_main_conf_t;
typedef struct {
mongo_cursor ** cursors;
ngx_uint_t numchunks;
} ngx_http_gridfs_cleanup_t;
/* Array specifying how to handle configuration directives. */
static ngx_command_t ngx_http_gridfs_commands[] = {
{
ngx_string("mongo"),
NGX_HTTP_LOC_CONF | NGX_CONF_1MORE,
ngx_http_mongo,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL
},
{
ngx_string("gridfs"),
NGX_HTTP_LOC_CONF | NGX_CONF_1MORE,
ngx_http_gridfs,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL
},
ngx_null_command
};
/* Module context. */
static ngx_http_module_t ngx_http_gridfs_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
ngx_http_gridfs_create_main_conf,
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* init serever configuration */
ngx_http_gridfs_create_loc_conf,
ngx_http_gridfs_merge_loc_conf
};
/* Module definition. */
ngx_module_t ngx_http_gridfs_module = {
NGX_MODULE_V1,
&ngx_http_gridfs_module_ctx,
ngx_http_gridfs_commands,
NGX_HTTP_MODULE,
NULL,
NULL,
ngx_http_gridfs_init_worker,
NULL,
NULL,
NULL,
NULL,
NGX_MODULE_V1_PADDING
};
ngx_array_t ngx_http_mongo_connections;
/* Parse the 'mongo' directive. */
static char * ngx_http_mongo(ngx_conf_t *cf, ngx_command_t *cmd, void *void_conf) {
ngx_str_t *value;
ngx_url_t u;
ngx_uint_t i;
ngx_uint_t start;
ngx_http_mongod_server_t *mongod_server;
ngx_http_gridfs_loc_conf_t *gridfs_loc_conf;
gridfs_loc_conf = void_conf;
value = cf->args->elts;
gridfs_loc_conf->mongo = value[1];
gridfs_loc_conf->mongods = ngx_array_create(cf->pool, 7,
sizeof(ngx_http_mongod_server_t));
if (gridfs_loc_conf->mongods == NULL) {
return NULL;
}
/* If nelts is greater than 3, then the user has specified more than one
* setting in the 'mongo' directive. So we assume that we're connecting
* to a replica set and that the first string of the directive is the replica
* set name. We also start looking for host-port pairs at position 2; otherwise,
* we start at position 1.
*/
if( cf->args->nelts >= 3 ) {
gridfs_loc_conf->replset.len = strlen( (char *)(value + 1)->data );
gridfs_loc_conf->replset.data = ngx_pstrdup( cf->pool, value + 1 );
start = 2;
} else
start = 1;
for (i = start; i < cf->args->nelts; i++) {
ngx_memzero(&u, sizeof(ngx_url_t));
u.url = value[i];
u.default_port = 27017;
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in mongo \"%V\"", u.err, &u.url);
}
return NGX_CONF_ERROR;
}
mongod_server = ngx_array_push(gridfs_loc_conf->mongods);
mongod_server->host = u.host;
mongod_server->port = u.port;
}
return NGX_CONF_OK;
}
/* Parse the 'gridfs' directive. */
static char* ngx_http_gridfs(ngx_conf_t* cf, ngx_command_t* command, void* void_conf) {
ngx_http_gridfs_loc_conf_t *gridfs_loc_conf = void_conf;
ngx_http_core_loc_conf_t* core_conf;
ngx_str_t *value, type;
volatile ngx_uint_t i;
core_conf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
core_conf-> handler = ngx_http_gridfs_handler;
value = cf->args->elts;
gridfs_loc_conf->db = value[1];
/* Parse the parameters */
for (i = 2; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "root_collection=", 16) == 0) {
gridfs_loc_conf->root_collection.data = (u_char *) &value[i].data[16];
gridfs_loc_conf->root_collection.len = ngx_strlen(&value[i].data[16]);
continue;
}
if (ngx_strncmp(value[i].data, "field=", 6) == 0) {
gridfs_loc_conf->field.data = (u_char *) &value[i].data[6];
gridfs_loc_conf->field.len = ngx_strlen(&value[i].data[6]);
/* Currently only support for "_id" and "filename" */
if (gridfs_loc_conf->field.data != NULL
&& ngx_strcmp(gridfs_loc_conf->field.data, "filename") != 0
&& ngx_strcmp(gridfs_loc_conf->field.data, "_id") != 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"Unsupported Field: %s", gridfs_loc_conf->field.data);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "type=", 5) == 0) {
type = (ngx_str_t) ngx_string(&value[i].data[5]);
/* Currently only support for "objectid", "string", and "int" */
if (type.len == 0) {
gridfs_loc_conf->type = NGX_CONF_UNSET_UINT;
} else if (ngx_strcasecmp(type.data, (u_char *)"objectid") == 0) {
gridfs_loc_conf->type = BSON_OID;
} else if (ngx_strcasecmp(type.data, (u_char *)"string") == 0) {
gridfs_loc_conf->type = BSON_STRING;
} else if (ngx_strcasecmp(type.data, (u_char *)"int") == 0) {
gridfs_loc_conf->type = BSON_INT;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"Unsupported Type: %s", (char *)value[i].data);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "user=", 5) == 0) {
gridfs_loc_conf->user.data = (u_char *) &value[i].data[5];
gridfs_loc_conf->user.len = ngx_strlen(&value[i].data[5]);
continue;
}
if (ngx_strncmp(value[i].data, "pass=", 5) == 0) {
gridfs_loc_conf->pass.data = (u_char *) &value[i].data[5];
gridfs_loc_conf->pass.len = ngx_strlen(&value[i].data[5]);
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (gridfs_loc_conf->field.data != NULL
&& ngx_strcmp(gridfs_loc_conf->field.data, "filename") == 0
&& gridfs_loc_conf->type != BSON_STRING) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"Field: filename, must be of Type: string");
return NGX_CONF_ERROR;
}
if ((gridfs_loc_conf->user.data == NULL || gridfs_loc_conf->user.len == 0)
&& !(gridfs_loc_conf->pass.data == NULL || gridfs_loc_conf->pass.len == 0)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"Password without username");
return NGX_CONF_ERROR;
}
if (!(gridfs_loc_conf->user.data == NULL || gridfs_loc_conf->user.len == 0)
&& (gridfs_loc_conf->pass.data == NULL || gridfs_loc_conf->pass.len == 0)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"Username without password");
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
static void *ngx_http_gridfs_create_main_conf(ngx_conf_t *cf) {
ngx_http_gridfs_main_conf_t *gridfs_main_conf;
gridfs_main_conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gridfs_main_conf_t));
if (gridfs_main_conf == NULL) {
return NULL;
}
if (ngx_array_init(&gridfs_main_conf->loc_confs, cf->pool, 4,
sizeof(ngx_http_gridfs_loc_conf_t *))
!= NGX_OK) {
return NULL;
}
return gridfs_main_conf;
}
static void* ngx_http_gridfs_create_loc_conf(ngx_conf_t* directive) {
ngx_http_gridfs_loc_conf_t* gridfs_conf;
gridfs_conf = ngx_pcalloc(directive->pool, sizeof(ngx_http_gridfs_loc_conf_t));
if (gridfs_conf == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, directive, 0,
"Failed to allocate memory for GridFS Location Config.");
return NGX_CONF_ERROR;
}
gridfs_conf->db.data = NULL;
gridfs_conf->db.len = 0;
gridfs_conf->root_collection.data = NULL;
gridfs_conf->root_collection.len = 0;
gridfs_conf->field.data = NULL;
gridfs_conf->field.len = 0;
gridfs_conf->type = NGX_CONF_UNSET_UINT;
gridfs_conf->user.data = NULL;
gridfs_conf->user.len = 0;
gridfs_conf->pass.data = NULL;
gridfs_conf->pass.len = 0;
gridfs_conf->mongo.data = NULL;
gridfs_conf->mongo.len = 0;
gridfs_conf->mongods = NGX_CONF_UNSET_PTR;
return gridfs_conf;
}
static char* ngx_http_gridfs_merge_loc_conf(ngx_conf_t* cf, void* void_parent, void* void_child) {
ngx_http_gridfs_loc_conf_t *parent = void_parent;
ngx_http_gridfs_loc_conf_t *child = void_child;
ngx_http_gridfs_main_conf_t *gridfs_main_conf = ngx_http_conf_get_module_main_conf(cf, ngx_http_gridfs_module);
ngx_http_gridfs_loc_conf_t **gridfs_loc_conf;
ngx_http_mongod_server_t *mongod_server;
ngx_conf_merge_str_value(child->db, parent->db, NULL);
ngx_conf_merge_str_value(child->root_collection, parent->root_collection, "fs");
ngx_conf_merge_str_value(child->field, parent->field, "_id");
ngx_conf_merge_uint_value(child->type, parent->type, BSON_OID);
ngx_conf_merge_str_value(child->user, parent->user, NULL);
ngx_conf_merge_str_value(child->pass, parent->pass, NULL);
ngx_conf_merge_str_value(child->mongo, parent->mongo, "127.0.0.1:27017");
if (child->mongods == NGX_CONF_UNSET_PTR) {
if (parent->mongods != NGX_CONF_UNSET_PTR) {
child->mongods = parent->mongods;
} else {
child->mongods = ngx_array_create(cf->pool, 4,
sizeof(ngx_http_mongod_server_t));
mongod_server = ngx_array_push(child->mongods);
mongod_server->host.data = (u_char *)"127.0.0.1";
mongod_server->host.len = sizeof("127.0.0.1") - 1;
mongod_server->port = 27017;
}
}
// Add the local gridfs conf to the main gridfs conf
if (child->db.data) {
gridfs_loc_conf = ngx_array_push(&gridfs_main_conf->loc_confs);
*gridfs_loc_conf = child;
}
return NGX_CONF_OK;
}
ngx_http_mongo_connection_t* ngx_http_get_mongo_connection( ngx_str_t name ) {
ngx_http_mongo_connection_t *mongo_conns;
ngx_uint_t i;
mongo_conns = ngx_http_mongo_connections.elts;
for ( i = 0; i < ngx_http_mongo_connections.nelts; i++ ) {
if ( name.len == mongo_conns[i].name.len
&& ngx_strncmp(name.data, mongo_conns[i].name.data, name.len) == 0 ) {
return &mongo_conns[i];
}
}
return NULL;
}
static ngx_int_t ngx_http_mongo_authenticate(ngx_log_t *log, ngx_http_gridfs_loc_conf_t *gridfs_loc_conf) {
ngx_http_mongo_connection_t* mongo_conn;
ngx_http_mongo_auth_t *mongo_auth;
mongo_cursor *cursor = NULL;
bson empty;
char *test;
int error;
mongo_conn = ngx_http_get_mongo_connection( gridfs_loc_conf->mongo );
if (mongo_conn == NULL) {
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Connection not found: \"%V\"", &gridfs_loc_conf->mongo);
}
// Authenticate
if (gridfs_loc_conf->user.data != NULL && gridfs_loc_conf->pass.data != NULL) {
if (mongo_cmd_authenticate( &mongo_conn->conn,
(const char*)gridfs_loc_conf->db.data,
(const char*)gridfs_loc_conf->user.data,
(const char*)gridfs_loc_conf->pass.data )
!= MONGO_OK) {
ngx_log_error(NGX_LOG_ERR, log, 0,
"Invalid mongo user/pass: %s/%s",
gridfs_loc_conf->user.data,
gridfs_loc_conf->pass.data);
return NGX_ERROR;
}
mongo_auth = ngx_array_push(mongo_conn->auths);
mongo_auth->db = gridfs_loc_conf->db;
mongo_auth->user = gridfs_loc_conf->user;
mongo_auth->pass = gridfs_loc_conf->pass;
}
// Run a test command to test authentication.
test = (char*)malloc( gridfs_loc_conf->db.len + sizeof(".test"));
ngx_cpystrn((u_char*)test, (u_char*)gridfs_loc_conf->db.data, gridfs_loc_conf->db.len+1);
ngx_cpystrn((u_char*)(test+gridfs_loc_conf->db.len),(u_char*)".test", sizeof(".test"));
bson_empty(&empty);
cursor = mongo_find(&mongo_conn->conn, test, &empty, NULL, 0, 0, 0);
error = mongo_cmd_get_last_error(&mongo_conn->conn, (char*)gridfs_loc_conf->db.data, NULL);
free(test);
mongo_cursor_destroy(cursor);
if (error) {
ngx_log_error(NGX_LOG_ERR, log, 0, "Authentication Required");
return NGX_ERROR;
}
return NGX_OK;
}
static ngx_int_t ngx_http_mongo_add_connection(ngx_cycle_t* cycle, ngx_http_gridfs_loc_conf_t* gridfs_loc_conf) {
ngx_http_mongo_connection_t* mongo_conn;
int status;
ngx_http_mongod_server_t *mongods;
volatile ngx_uint_t i;
u_char host[255];
mongods = gridfs_loc_conf->mongods->elts;
mongo_conn = ngx_http_get_mongo_connection( gridfs_loc_conf->mongo );
if (mongo_conn != NULL) {
return NGX_OK;
}
mongo_conn = ngx_array_push(&ngx_http_mongo_connections);
if (mongo_conn == NULL) {
return NGX_ERROR;
}
mongo_conn->name = gridfs_loc_conf->mongo;
mongo_conn->auths = ngx_array_create(cycle->pool, 4, sizeof(ngx_http_mongo_auth_t));
if ( gridfs_loc_conf->mongods->nelts == 1 ) {
ngx_cpystrn( host, mongods[0].host.data, mongods[0].host.len + 1 );
status = mongo_connect( &mongo_conn->conn, (const char*)host, mongods[0].port );
} else if ( gridfs_loc_conf->mongods->nelts >= 2 && gridfs_loc_conf->mongods->nelts < 9 ) {
/* Initiate replica set connection. */
mongo_replset_init( &mongo_conn->conn, (const char *)gridfs_loc_conf->replset.data );
/* Add replica set seeds. */
for( i=0; i<gridfs_loc_conf->mongods->nelts; ++i ) {
ngx_cpystrn( host, mongods[i].host.data, mongods[i].host.len + 1 );
mongo_replset_add_seed( &mongo_conn->conn, (const char *)host, mongods[i].port );
}
status = mongo_replset_connect( &mongo_conn->conn );
} else {
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Nginx Exception: Too many strings provided in 'mongo' directive.");
return NGX_ERROR;
}
switch (status) {
case MONGO_CONN_SUCCESS:
break;
case MONGO_CONN_NO_SOCKET:
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Exception: No Socket");
return NGX_ERROR;
case MONGO_CONN_FAIL:
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Exception: Connection Failure.");
return NGX_ERROR;
case MONGO_CONN_ADDR_FAIL:
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Exception: getaddrinfo Failure.");
return NGX_ERROR;
case MONGO_CONN_NOT_MASTER:
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Exception: Not Master");
return NGX_ERROR;
case MONGO_CONN_BAD_SET_NAME:
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Exception: Replica set name %s does not match.", gridfs_loc_conf->replset.data);
return NGX_ERROR;
case MONGO_CONN_NO_PRIMARY:
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Exception: Cannot connect to primary node.");
return NGX_ERROR;
default:
ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
"Mongo Exception: Unknown Error");
return NGX_ERROR;
}
return NGX_OK;
}
static ngx_int_t ngx_http_gridfs_init_worker(ngx_cycle_t* cycle) {
ngx_http_gridfs_main_conf_t* gridfs_main_conf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_gridfs_module);
ngx_http_gridfs_loc_conf_t** gridfs_loc_confs;
ngx_uint_t i;
signal(SIGPIPE, SIG_IGN);
gridfs_loc_confs = gridfs_main_conf->loc_confs.elts;
ngx_array_init(&ngx_http_mongo_connections, cycle->pool, 4, sizeof(ngx_http_mongo_connection_t));
for (i = 0; i < gridfs_main_conf->loc_confs.nelts; i++) {
if (ngx_http_mongo_add_connection(cycle, gridfs_loc_confs[i]) == NGX_ERROR) {
return NGX_ERROR;
}
if (ngx_http_mongo_authenticate(cycle->log, gridfs_loc_confs[i]) == NGX_ERROR) {
return NGX_ERROR;
}
}
return NGX_OK;
}
static ngx_int_t ngx_http_mongo_reconnect(ngx_log_t *log, ngx_http_mongo_connection_t *mongo_conn) {
volatile int status = MONGO_CONN_FAIL;
if (&mongo_conn->conn.connected) {
mongo_disconnect(&mongo_conn->conn);
ngx_msleep(MONGO_RECONNECT_WAITTIME);
status = mongo_reconnect(&mongo_conn->conn);
} else {
status = MONGO_CONN_FAIL;
}
switch (status) {
case MONGO_CONN_SUCCESS:
break;
case MONGO_CONN_NO_SOCKET:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: No Socket");
return NGX_ERROR;
case MONGO_CONN_FAIL:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: Connection Failure %s:%i;",
mongo_conn->conn.primary->host,
mongo_conn->conn.primary->port);
return NGX_ERROR;
case MONGO_CONN_ADDR_FAIL:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: getaddrinfo Failure");
return NGX_ERROR;
case MONGO_CONN_NOT_MASTER:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: Not Master");
return NGX_ERROR;
default:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: Unknown Error");
return NGX_ERROR;
}
return NGX_OK;
}
static ngx_int_t ngx_http_mongo_reauth(ngx_log_t *log, ngx_http_mongo_connection_t *mongo_conn) {
ngx_http_mongo_auth_t *auths;
volatile ngx_uint_t i;
volatile ngx_int_t status = 0;
auths = mongo_conn->auths->elts;
for (i = 0; i < mongo_conn->auths->nelts; i++) {
status = mongo_cmd_authenticate( &mongo_conn->conn,
(const char*)auths[i].db.data,
(const char*)auths[i].user.data,
(const char*)auths[i].pass.data );
if (status != MONGO_OK) {
ngx_log_error(NGX_LOG_ERR, log, 0,
"Invalid mongo user/pass: %s/%s, during reauth",
auths[i].user.data,
auths[i].pass.data);
return NGX_ERROR;
}
}
return NGX_OK;
}
static char h_digit(char hex) {
return (hex >= '0' && hex <= '9') ? hex - '0': ngx_tolower(hex)-'a'+10;
}
static int htoi(char* h) {
char ok[] = "0123456789AaBbCcDdEeFf";
if (ngx_strchr(ok, h[0]) == NULL || ngx_strchr(ok,h[1]) == NULL) { return -1; }
return h_digit(h[0])*16 + h_digit(h[1]);
}
static int url_decode(char * filename) {
char * read = filename;
char * write = filename;
char hex[3];
int c;
hex[2] = '\0';
while (*read != '\0'){
if (*read == '%') {
hex[0] = *(++read);
if (hex[0] == '\0') return 0;
hex[1] = *(++read);
if (hex[1] == '\0') return 0;
c = htoi(hex);
if (c == -1) return 0;
*write = (char)c;
}
else *write = *read;
read++;
write++;
}
*write = '\0';
return 1;
}
static void gridfs_parse_range(ngx_http_request_t* r, ngx_str_t* range_str, uint64_t* range_start, uint64_t* range_end, gridfs_offset content_length) {
u_char *p, *last;
off_t start, end;
ngx_uint_t bad;
enum {
sw_start = 0,
sw_first_byte_pos,
sw_first_byte_pos_n,
sw_last_byte_pos,
sw_last_byte_pos_n,
sw_done
} state = 0;
p = (u_char *) ngx_strnstr(range_str->data, "bytes=", range_str->len);
if (p == NULL) {
return;
}
p += sizeof("bytes=") - 1;
last = range_str->data + range_str->len;
/*
* bytes= contain ranges compatible with RFC 2616, "14.35.1 Byte Ranges",
* but no whitespaces permitted
*/
bad = 0;
start = 0;
end = 0;
while (p < last) {
switch (state) {
case sw_start:
case sw_first_byte_pos:
if (*p == '-') {
p++;
state = sw_last_byte_pos;
break;
}
start = 0;
state = sw_first_byte_pos_n;
/* fall through */
case sw_first_byte_pos_n:
if (*p == '-') {
p++;
state = sw_last_byte_pos;
break;
}
if (*p < '0' || *p > '9') {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"bytes header filter: unexpected char '%c'"
" (expected first-byte-pos)", *p);
bad = 1;
break;
}
start = start * 10 + *p - '0';
p++;
break;
case sw_last_byte_pos:
if (*p == ',' || *p == '&' || *p == ';') {
/* no last byte pos, assume end of file */
end = content_length - 1;
state = sw_done;
break;
}
end = 0;
state = sw_last_byte_pos_n;
/* fall though */
case sw_last_byte_pos_n:
if (*p == ',' || *p == '&' || *p == ';') {
state = sw_done;
break;
}
if (*p < '0' || *p > '9') {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"bytes header filter: unexpected char '%c'"
" (expected last-byte-pos)", *p);
bad = 1;
break;
}
end = end * 10 + *p - '0';
p++;
break;
case sw_done:
*range_start = start;
*range_end = end;
break;
}
if (bad) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"bytes header filter: invalid range specification");
return;
}
}
switch (state) {
case sw_last_byte_pos:
end = content_length - 1;
case sw_last_byte_pos_n:
if (start > end) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"bytes header filter: invalid range specification");
return;
}
*range_start = start;
*range_end = end;
break;
default:
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"bytes header filter: invalid range specification");
return;
}
}
static ngx_int_t ngx_http_gridfs_handler(ngx_http_request_t* request) {
ngx_http_gridfs_loc_conf_t* gridfs_conf;
ngx_http_core_loc_conf_t* core_conf;
ngx_buf_t* buffer;
ngx_chain_t out;
ngx_str_t location_name;
ngx_str_t full_uri;
char* value;
ngx_http_mongo_connection_t *mongo_conn;
gridfs gfs;
gridfile gfile;
gridfs_offset length;
ngx_uint_t numchunks;
char* contenttype;
char* md5;
bson_date_t last_modified;
volatile ngx_uint_t i;
ngx_int_t rc = NGX_OK;
bson query;
bson_oid_t oid;
mongo_cursor ** cursors;
gridfs_offset chunk_len;
const char * chunk_data;
bson_iterator it;
bson chunk;
ngx_pool_cleanup_t* gridfs_cln;
ngx_http_gridfs_cleanup_t* gridfs_clndata;
int status;
volatile ngx_uint_t e = FALSE;
volatile ngx_uint_t ecounter = 0;
uint64_t range_start = 0;
uint64_t range_end = 0;
uint64_t current_buf_pos = 0;
gridfs_conf = ngx_http_get_module_loc_conf(request, ngx_http_gridfs_module);
core_conf = ngx_http_get_module_loc_conf(request, ngx_http_core_module);
// ---------- ENSURE MONGO CONNECTION ---------- //
mongo_conn = ngx_http_get_mongo_connection( gridfs_conf->mongo );
if (mongo_conn == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo Connection not found: \"%V\"", &gridfs_conf->mongo);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (mongo_conn->conn.connected == 0) {
if (ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Could not connect to mongo: \"%V\"", &gridfs_conf->mongo);
if(mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
if (ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to reauth to mongo: \"%V\"", &gridfs_conf->mongo);
if(mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
}
// ---------- RETRIEVE KEY ---------- //
location_name = core_conf->name;
full_uri = request->uri;
if (full_uri.len < location_name.len) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Invalid location name or uri.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
value = (char*)malloc(sizeof(char) * (full_uri.len - location_name.len + 1));
if (value == NULL) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Failed to allocate memory for value buffer.");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
memcpy(value, full_uri.data + location_name.len, full_uri.len - location_name.len);
value[full_uri.len - location_name.len] = '\0';
if (!url_decode(value)) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Malformed request.");
free(value);
return NGX_HTTP_BAD_REQUEST;
}
// ---------- RETRIEVE GRIDFILE ---------- //
do {
e = FALSE;
status = gridfs_init(&mongo_conn->conn,
(const char*)gridfs_conf->db.data,
(const char*)gridfs_conf->root_collection.data,
&gfs);
if (status != MONGO_OK) {
e = TRUE; ecounter++;
if (ecounter > MONGO_MAX_RETRIES_PER_REQUEST
|| ngx_http_mongo_reconnect(request->connection->log, mongo_conn) == NGX_ERROR
|| ngx_http_mongo_reauth(request->connection->log, mongo_conn) == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, request->connection->log, 0,
"Mongo connection dropped, could not reconnect");
if(mongo_conn->conn.connected) { mongo_disconnect(&mongo_conn->conn); }
free(value);
return NGX_HTTP_SERVICE_UNAVAILABLE;
}
}
} while (e);
bson_init(&query);
switch (gridfs_conf->type) {
case BSON_OID:
bson_oid_from_string(&oid, value);
bson_append_oid(&query, (char*)gridfs_conf->field.data, &oid);
break;
case BSON_INT:
bson_append_int(&query, (char*)gridfs_conf->field.data, ngx_atoi((u_char*)value, strlen(value)));
break;
case BSON_STRING:
bson_append_string(&query, (char*)gridfs_conf->field.data, value);
break;
}
bson_finish(&query);
status = gridfs_find_query(&gfs, &query, &gfile);
bson_destroy(&query);
free(value);
if(status == MONGO_ERROR) {
gridfs_destroy(&gfs);
return NGX_HTTP_NOT_FOUND;
}
/* Get information about the file */
length = gridfile_get_contentlength(&gfile);
numchunks = gridfile_get_numchunks(&gfile);
// NaN workaround
if (numchunks > INT_MAX)
{
gridfile_destroy(&gfile);
gridfs_destroy(&gfs);
return NGX_HTTP_NOT_FOUND;
}
contenttype = (char*)gridfile_get_contenttype(&gfile);
md5 = (char*)gridfile_get_md5(&gfile);
last_modified = gridfile_get_uploaddate(&gfile);
// ---------- Partial Range
// set follow-fork-mode child
// attach (pid)
// break ngx_http_gridfs_module.c:959
if (request->headers_in.range) {
gridfs_parse_range(request, &request->headers_in.range->value, &range_start, &range_end, length);
}
// ---------- SEND THE HEADERS ---------- //
if (range_start == 0 && range_end == 0) {
request->headers_out.status = NGX_HTTP_OK;
request->headers_out.content_length_n = length;
} else {
request->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
request->headers_out.content_length_n = length;
//request->headers_out.content_range = range_end - range_start + 1;
ngx_table_elt_t *content_range;
content_range = ngx_list_push(&request->headers_out.headers);
if (content_range == NULL) {
return NGX_ERROR;
}
request->headers_out.content_range = content_range;
content_range->hash = 1;
ngx_str_set(&content_range->key, "Content-Range");
content_range->value.data = ngx_pnalloc(request->pool,sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN);
if (content_range->value.data == NULL) {
return NGX_ERROR;
}
/* "Content-Range: bytes SSSS-EEEE/TTTT" header */
content_range->value.len = ngx_sprintf(content_range->value.data,
"bytes %O-%O/%O",
range_start, range_end,
request->headers_out.content_length_n)
- content_range->value.data;
request->headers_out.content_length_n = range_end - range_start + 1;
}
if (contenttype != NULL) {
request->headers_out.content_type.len = strlen(contenttype);
request->headers_out.content_type.data = (u_char*)contenttype;