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Glossary

Bucket Operations

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Última atualização: 2024-02-01 18:01:21

Overview

This document provides an overview of APIs and SDK sample codes related to basic bucket operations and access control lists (ACL).
Note:
We recommend you use a temporary key as instructed in Generating and Using Temporary Keys to call the SDK for security purposes. When you apply for a temporary key, follow the Notes on Principle of Least Privilege to avoid leaking resources besides your buckets and objects.
If you must use a permanent key, we recommend you follow the Notes on Principle of Least Privilege to limit the scope of permission on the permanent key.
Basic operations
API
Operation
Description
Creating a bucket
Creates a bucket under a specified account
Deleting a bucket
Deletes an empty bucket from a specified account
Extracting a bucket and its permissions
API
Operation
Description
Checking a bucket and its permissions
Checks whether a bucket exists and whether you have permission to access it

Basic operations

Creating a bucket

Feature description

This API is used to create a bucket under a specified account.

Method prototype

cos_status_t *cos_create_bucket(const cos_request_options_t *options,
const cos_string_t *bucket,
cos_acl_e cos_acl,
cos_table_t **resp_headers);

Field description

Parameter
Description
Type
options
COS request options
Struct
bucket
Bucket name in the format: BucketName-APPID
String
cos_acl
Allow users to customize permissions.
Valid values: COS_ACL_PRIVATE(0) (default), COS_ACL_PUBLIC_READ(1), COS_ACL_PUBLIC_READ_WRITE(2)
Enum
resp_headers
Returns the HTTP response headers
Struct

Response description

Response Parameter
Description
Type
code
Error code
Int
error_code
Error code content
String
error_msg
Error code description
String
req_id
Request message ID
String

Sample

#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>

// `endpoint` is the COS access domain name. For more information, see https://www.tencentcloud.com/document/product/436/6224.
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// A developer-owned secret ID/key used for the project. It can be obtained at https://console.tencentcloud.com/cam/capi.
static char *TEST_ACCESS_KEY_ID; //your secret_id
static char *TEST_ACCESS_KEY_SECRET; //your secret_key
// The only user-level resource identifier for COS access. It can be obtained at https://console.tencentcloud.com/cam/capi.
static char TEST_APPID[] = "<APPID>"; //your appid
// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.tencentcloud.com/cos5/bucket.
static char TEST_BUCKET_NAME[] = "<bucketname-appid>";

void log_status(cos_status_t *s)
{
cos_warn_log("status->code: %d", s->code);
if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);
if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);
if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);
}

void init_test_config(cos_config_t *config, int is_cname)
{
cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);
cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);
cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);
cos_str_set(&config->appid, TEST_APPID);
config->is_cname = is_cname;
}

void init_test_request_options(cos_request_options_t *options, int is_cname)
{
options->config = cos_config_create(options->pool);
init_test_config(options->config, is_cname);
options->ctl = cos_http_controller_create(options->pool, 0);
}

void test_create_bucket()
{
cos_pool_t *p = NULL;
int is_cname = 0;
cos_status_t *s = NULL;
cos_request_options_t *options = NULL;
cos_acl_e cos_acl = COS_ACL_PRIVATE;
cos_string_t bucket;
cos_table_t *resp_headers;

// Initialize the request options
cos_pool_create(&p, NULL);
options = cos_request_options_create(p);
init_test_request_options(options, is_cname);
cos_str_set(&bucket, TEST_BUCKET_NAME);

// Create a bucket
s = cos_create_bucket(options, &bucket, cos_acl, &resp_headers);
if (cos_status_is_ok(s)) {
printf("create bucket succeeded\\n");
} else {
printf("create bucket failed\\n");
}

// Destroy the memory pool
cos_pool_destroy(p);
}

int main(int argc, char *argv[])
{
// Get SecretId and SecretKey from environment variables
TEST_ACCESS_KEY_ID = getenv("COS_SECRETID");
TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");

if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
exit(1);
}

//set log level, default COS_LOG_WARN
cos_log_set_level(COS_LOG_WARN);

//set log output, default stderr
cos_log_set_output(NULL);

test_create_bucket();

cos_http_io_deinitialize();

return 0;
}

Deleting a bucket

Feature description

This API is used to delete an empty bucket under a specified account.

Method prototype

cos_status_t *cos_delete_bucket(const cos_request_options_t *options,
const cos_string_t *bucket,
cos_table_t **resp_headers);

Field description

Parameter
Description
Type
options
COS request options
Struct
bucket
Bucket name in the format: BucketName-APPID
String
resp_headers
Returns the HTTP response headers
Struct

Response description

Response Parameter
Description
Type
code
Error code
Int
error_code
Error code content
String
error_msg
Error code description
String
req_id
Request message ID
String

Sample

#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>

// `endpoint` is the COS access domain name. For more information, see https://www.tencentcloud.com/document/product/436/6224.
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// A developer-owned secret ID/key used for the project. It can be obtained at https://console.tencentcloud.com/cam/capi.
static char *TEST_ACCESS_KEY_ID; //your secret_id
static char *TEST_ACCESS_KEY_SECRET; //your secret_key
// The only user-level resource identifier for COS access. It can be obtained at https://console.tencentcloud.com/cam/capi.
static char TEST_APPID[] = "<APPID>"; //your appid
// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.tencentcloud.com/cos5/bucket.
static char TEST_BUCKET_NAME[] = "<bucketname-appid>";

void log_status(cos_status_t *s)
{
cos_warn_log("status->code: %d", s->code);
if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);
if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);
if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);
}

void init_test_config(cos_config_t *config, int is_cname)
{
cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);
cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);
cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);
cos_str_set(&config->appid, TEST_APPID);
config->is_cname = is_cname;
}

void init_test_request_options(cos_request_options_t *options, int is_cname)
{
options->config = cos_config_create(options->pool);
init_test_config(options->config, is_cname);
options->ctl = cos_http_controller_create(options->pool, 0);
}

void test_delete_bucket()
{
cos_pool_t *p = NULL;
int is_cname = 0;
cos_status_t *s = NULL;
cos_request_options_t *options = NULL;
cos_string_t bucket;
cos_table_t *resp_headers;

// Initialize the request options
cos_pool_create(&p, NULL);
options = cos_request_options_create(p);
init_test_request_options(options, is_cname);
cos_str_set(&bucket, TEST_BUCKET_NAME);

// Delete a bucket
s = cos_delete_bucket(options, &bucket, &resp_headers);
if (cos_status_is_ok(s)) {
printf("create bucket succeeded\\n");
} else {
printf("create bucket failed\\n");
}

// Destroy the memory pool
cos_pool_destroy(p);
}

int main(int argc, char *argv[])
{
// Get SecretId and SecretKey from environment variables
TEST_ACCESS_KEY_ID = getenv("COS_SECRETID");
TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");

if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
exit(1);
}

//set log level, default COS_LOG_WARN
cos_log_set_level(COS_LOG_WARN);

//set log output, default stderr
cos_log_set_output(NULL);

test_delete_bucket();

cos_http_io_deinitialize();

return 0;
}

Checking whether a bucket exists

Feature description

This API is used to check whether a bucket exists. It actually calls the HEAD Bucket API to perform the action.

Method prototype

cos_status_t *cos_check_bucket_exist(const cos_request_options_t *options,
const cos_string_t *bucket,
cos_bucket_exist_status_e *bucket_exist,
cos_table_t **resp_headers)

Field description

Parameter
Description
Type
options
COS request options
Struct
bucket
Bucket name in the format: BucketName-APPID
String
bucket_exist
Whether a bucket exists. Enumerated values: exist, non exist, unknown (no explicit state is obtained)
Enum
resp_headers
Returns the HTTP response headers
Struct

Response description

Response Parameter
Description
Type
code
Error code
Int
error_code
Error code content
String
error_msg
Error code description
String
req_id
Request message ID
String

Sample

#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>

// `endpoint` is the COS access domain name. For more information, see https://www.tencentcloud.com/document/product/436/6224.
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// A developer-owned secret ID/key used for the project. It can be obtained at https://console.tencentcloud.com/cam/capi.
static char *TEST_ACCESS_KEY_ID; //your secret_id
static char *TEST_ACCESS_KEY_SECRET; //your secret_key
// The only user-level resource identifier for COS access. It can be obtained at https://console.tencentcloud.com/cam/capi.
static char TEST_APPID[] = "<APPID>"; //your appid
// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.tencentcloud.com/cos5/bucket.
static char TEST_BUCKET_NAME[] = "<bucketname-appid>";

void log_status(cos_status_t *s)
{
cos_warn_log("status->code: %d", s->code);
if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);
if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);
if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);
}

void init_test_config(cos_config_t *config, int is_cname)
{
cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);
cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);
cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);
cos_str_set(&config->appid, TEST_APPID);
config->is_cname = is_cname;
}

void init_test_request_options(cos_request_options_t *options, int is_cname)
{
options->config = cos_config_create(options->pool);
init_test_config(options->config, is_cname);
options->ctl = cos_http_controller_create(options->pool, 0);
}

void test_check_bucket_exist()
{
cos_pool_t *pool = NULL;
int is_cname = 0;
cos_status_t *status = NULL;
cos_request_options_t *options = NULL;
cos_string_t bucket;
cos_table_t *resp_headers = NULL;
cos_bucket_exist_status_e bucket_exist;

// Create a memory pool
cos_pool_create(&pool, NULL);

// Initialize the request options
options = cos_request_options_create(pool);
init_test_request_options(options, is_cname);

cos_str_set(&bucket, TEST_BUCKET_NAME);

// Check whether a bucket exists
status = cos_check_bucket_exist(options, &bucket, &bucket_exist, &resp_headers);
if (bucket_exist == COS_BUCKET_NON_EXIST) {
printf("bucket: %.*s non exist.\\n", bucket.len, bucket.data);
} else if (bucket_exist == COS_BUCKET_EXIST) {
printf("bucket: %.*s exist.\\n", bucket.len, bucket.data);
} else {
printf("bucket: %.*s unknown status.\\n", bucket.len, bucket.data);
log_status(status);
}

cos_pool_destroy(pool);
}

int main(int argc, char *argv[])
{
// Get SecretId and SecretKey from environment variables
TEST_ACCESS_KEY_ID = getenv("COS_SECRETID");
TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");

if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
exit(1);
}

//set log level, default COS_LOG_WARN
cos_log_set_level(COS_LOG_WARN);

//set log output, default stderr
cos_log_set_output(NULL);

test_check_bucket_exist();

cos_http_io_deinitialize();

return 0;
}


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