クロスオリジンリソース共有 (CORS) は、webアプリケーションサーバーがクロスオリジンアクセスを制御し、クロスオリジンデータ送信を安全にするために、HTML5によって提供される標準のクロスオリジンソリューションです。 このトピックでは、CORSの使用方法について説明します。
使用上の注意
OSS SDK for C 3.6.0以降はCORSをサポートしています。
このトピックでは、中国 (杭州) リージョンのパブリックエンドポイントを使用します。 OSSと同じリージョンにある他のAlibaba CloudサービスからOSSにアクセスする場合は、内部エンドポイントを使用します。 OSSリージョンとエンドポイントの詳細については、「リージョンとエンドポイント」をご参照ください。
このトピックでは、OSSエンドポイントを使用してOSSClientインスタンスを作成します。 カスタムドメイン名またはSTS (Security Token Service) を使用してOSSClientインスタンスを作成する場合は、「初期化」をご参照ください。
CORSルールを設定するには、
oss:PutBucketCors権限が必要です。 CORSルールを照会するには、oss:GetBucketCors権限が必要です。 CORSルールを削除するには、oss:DeleteBucketCors権限が必要です。 詳細については、「RAMユーザーへのカスタムポリシーのアタッチ」をご参照ください。
CORS ルールの設定
次のコードは、特定のバケットにCORSルールを設定する方法の例を示しています。
#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* Use a char* string to initialize data of the aos_string_t type. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
// Specify two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Specify network parameters, such as the timeout period. */
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
/* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
aos_pool_t *pool;
/* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
aos_pool_create(&pool, NULL);
/* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
oss_request_options_t *oss_client_options;
/* Allocate the memory resources in the memory pool to the options. */
oss_client_options = oss_request_options_create(pool);
/* Initialize oss_client_options. */
init_options(oss_client_options);
/* Initialize the parameters. */
aos_string_t bucket;
aos_table_t *resp_headers = NULL;
aos_status_t *resp_status = NULL;
aos_list_t cors_rule_list;
oss_cors_rule_t *cors_rule1 = NULL, *cors_rule2 = NULL;
aos_str_set(&bucket, bucket_name);
aos_list_init(&cors_rule_list);
cors_rule1 = oss_create_cors_rule(pool);
aos_list_add_tail(&cors_rule1->node, &cors_rule_list);
oss_create_sub_cors_rule(pool, &cors_rule1->allowed_origin_list, "allowed_origin_1_1");
oss_create_sub_cors_rule(pool, &cors_rule1->allowed_origin_list, "allowed_origin_1_1");
oss_create_sub_cors_rule(pool, &cors_rule1->allowed_method_list, "PUT");
oss_create_sub_cors_rule(pool, &cors_rule1->allowed_method_list, "GET");
oss_create_sub_cors_rule(pool, &cors_rule1->allowed_head_list, "Authorization");
oss_create_sub_cors_rule(pool, &cors_rule1->expose_head_list, "expose_head_1_1");
oss_create_sub_cors_rule(pool, &cors_rule1->expose_head_list, "expose_head_1_1");
cors_rule2 = oss_create_cors_rule(pool);
aos_list_add_tail(&cors_rule2->node, &cors_rule_list);
oss_create_sub_cors_rule(pool, &cors_rule2->allowed_origin_list, "allowed_origin_2_1");
oss_create_sub_cors_rule(pool, &cors_rule2->allowed_origin_list, "allowed_origin_2_2");
oss_create_sub_cors_rule(pool, &cors_rule2->allowed_method_list, "PUT");
oss_create_sub_cors_rule(pool, &cors_rule2->allowed_method_list, "GET");
oss_create_sub_cors_rule(pool, &cors_rule2->allowed_head_list, "Authorization");
oss_create_sub_cors_rule(pool, &cors_rule2->expose_head_list, "expose_head_2_1");
oss_create_sub_cors_rule(pool, &cors_rule2->expose_head_list, "expose_head_2_2");
/* Configure CORS rules. */
resp_status = oss_put_bucket_cors(oss_client_options, &bucket, &cors_rule_list, &resp_headers);
if (aos_status_is_ok(resp_status)) {
printf("put bucket cors succeeded\n");
} else {
printf("put bucket cors failed\n");
}
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(pool);
/* Release the allocated global resources. */
aos_http_io_deinitialize();
return 0;
}CORSルールの照会
次のコードは、特定のバケットに設定されているCORSルールを照会する方法の例を示しています。
#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* Use a char* string to initialize data of the aos_string_t type. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
// Specify two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Configure network parameters, such as the timeout period. */
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
/* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
aos_pool_t *pool;
/* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
aos_pool_create(&pool, NULL);
/* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
oss_request_options_t *oss_client_options;
/* Allocate the memory resources in the memory pool to the options. */
oss_client_options = oss_request_options_create(pool);
/* Initialize oss_client_options. */
init_options(oss_client_options);
/* Initialize the parameters. */
aos_string_t bucket;
aos_table_t *resp_headers = NULL;
aos_status_t *resp_status = NULL;
aos_list_t cors_rule_list;
oss_cors_rule_t *cors_rule = NULL;
oss_sub_cors_rule_t *sub_cors_rule = NULL;
aos_str_set(&bucket, bucket_name);
/* Query CORS rules. */
aos_list_init(&cors_rule_list);
resp_status = oss_get_bucket_cors(oss_client_options, &bucket, &cors_rule_list, &resp_headers);
if (aos_status_is_ok(resp_status)) {
printf("get bucket cors succeeded\n");
aos_list_for_each_entry(oss_cors_rule_t, cors_rule, &cors_rule_list, node) {
printf("max_age_seconds: %d\n", cors_rule->max_age_seconds);
aos_list_for_each_entry(oss_sub_cors_rule_t, sub_cors_rule, &cors_rule->allowed_origin_list, node) {
printf("allowed_origin_list: %s \n", sub_cors_rule->rule.data);
}
aos_list_for_each_entry(oss_sub_cors_rule_t, sub_cors_rule, &cors_rule->allowed_method_list, node) {
printf("allowed_method_list: %s \n", sub_cors_rule->rule.data);
}
aos_list_for_each_entry(oss_sub_cors_rule_t, sub_cors_rule, &cors_rule->allowed_head_list, node) {
printf("allowed_head_list: %s \n", sub_cors_rule->rule.data);
}
aos_list_for_each_entry(oss_sub_cors_rule_t, sub_cors_rule, &cors_rule->expose_head_list, node) {
printf("expose_head_list: %s \n", sub_cors_rule->rule.data);
}
}
} else {
printf("get bucket cors failed\n");
}
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(pool);
/* Release the allocated global resources. */
aos_http_io_deinitialize();
return 0;
}CORS ルールの削除
次のコードは、特定のバケットに設定されているCORSルールを削除する方法の例を示しています。
#include "oss_api.h"
#include "aos_http_io.h"
/* Specify the endpoint of the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the endpoint to https://oss-cn-hangzhou.aliyuncs.com. */
const char *endpoint = "yourEndpoint";
/* Specify the name of the bucket. Example: examplebucket. */
const char *bucket_name = "examplebucket";
/* Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou. */
const char *region = "yourRegion";
void init_options(oss_request_options_t *options)
{
options->config = oss_config_create(options->pool);
/* Use a char* string to initialize data of the aos_string_t type. */
aos_str_set(&options->config->endpoint, endpoint);
/* Obtain access credentials from environment variables. Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured. */
aos_str_set(&options->config->access_key_id, getenv("OSS_ACCESS_KEY_ID"));
aos_str_set(&options->config->access_key_secret, getenv("OSS_ACCESS_KEY_SECRET"));
// Specify two additional parameters.
aos_str_set(&options->config->region, region);
options->config->signature_version = 4;
/* Specify whether to use CNAME. The value 0 indicates that CNAME is not used. */
options->config->is_cname = 0;
/* Configure network parameters, such as the timeout period. */
options->ctl = aos_http_controller_create(options->pool, 0);
}
int main(int argc, char *argv[])
{
/* Call the aos_http_io_initialize method in main() to initialize global resources, such as network resources and memory resources. */
if (aos_http_io_initialize(NULL, 0) != AOSE_OK) {
exit(1);
}
/* Create a memory pool to manage memory. aos_pool_t is equivalent to apr_pool_t. The code used to create a memory pool is included in the APR library. */
aos_pool_t *pool;
/* Create a memory pool. The value of the second parameter is NULL. This value indicates that the pool does not inherit other memory pools. */
aos_pool_create(&pool, NULL);
/* Create and initialize options. This parameter includes global configuration information, such as endpoint, access_key_id, access_key_secret, is_cname, and curl. */
oss_request_options_t *oss_client_options;
/* Allocate the memory resources in the memory pool to the options. */
oss_client_options = oss_request_options_create(pool);
/* Initialize oss_client_options. */
init_options(oss_client_options);
/* Initialize the parameters. */
aos_string_t bucket;
aos_table_t *resp_headers = NULL;
aos_status_t *resp_status = NULL;
aos_str_set(&bucket, bucket_name);
/* Delete CORS rules. */
resp_status = oss_delete_bucket_cors(oss_client_options, &bucket, &resp_headers);
if (aos_status_is_ok(resp_status)) {
printf("delete bucket cors succeeded\n");
} else {
printf("delete bucket cors failed\n");
}
/* Release the memory pool. This operation releases the memory resources allocated for the request. */
aos_pool_destroy(pool);
/* Release the allocated global resources. */
aos_http_io_deinitialize();
return 0;
}関連ドキュメント
CORSルールを設定するために呼び出すことができるAPI操作の詳細については、「PutBucketCors」をご参照ください。
CORSルールを照会するために呼び出すAPI操作の詳細については、「GetBucketCors」をご参照ください。
CORSルールを削除するために呼び出すことができるAPI操作の詳細については、「DeleteBucketCors」をご参照ください。