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Bucket Operations

Last updated: 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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