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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/auth/credentials.h>
#include <aws/auth/private/credentials_utils.h>
struct aws_credentials_provider_chain_impl {
struct aws_array_list providers;
};
struct aws_credentials_provider_chain_user_data {
struct aws_allocator *allocator;
struct aws_credentials_provider *provider_chain;
size_t current_provider_index;
aws_on_get_credentials_callback_fn *original_callback;
void *original_user_data;
};
static void s_aws_provider_chain_member_callback(struct aws_credentials *credentials, int error_code, void *user_data) {
struct aws_credentials_provider_chain_user_data *wrapped_user_data = user_data;
struct aws_credentials_provider *provider = wrapped_user_data->provider_chain;
struct aws_credentials_provider_chain_impl *impl = provider->impl;
size_t provider_count = aws_array_list_length(&impl->providers);
if (credentials != NULL || wrapped_user_data->current_provider_index + 1 >= provider_count) {
AWS_LOGF_INFO(
AWS_LS_AUTH_CREDENTIALS_PROVIDER,
"(id=%p) Credentials provider chain callback terminating on index %zu, with %s credentials and error code "
"%d",
(void *)provider,
wrapped_user_data->current_provider_index + 1,
(credentials != NULL) ? "valid" : "invalid",
error_code);
goto on_terminate_chain;
}
AWS_LOGF_DEBUG(
AWS_LS_AUTH_CREDENTIALS_PROVIDER,
"(id=%p) Credentials provider chain callback %zu invoked with %s credentials and error code %d",
(void *)provider,
wrapped_user_data->current_provider_index + 1,
(credentials != NULL) ? "valid" : "invalid",
error_code);
wrapped_user_data->current_provider_index++;
/*
* TODO: Immutable data, shouldn't need a lock, but we might need a fence and we don't have one atm
*/
struct aws_credentials_provider *next_provider = NULL;
if (aws_array_list_get_at(&impl->providers, &next_provider, wrapped_user_data->current_provider_index)) {
goto on_terminate_chain;
}
AWS_LOGF_DEBUG(
AWS_LS_AUTH_CREDENTIALS_PROVIDER,
"(id=%p) Credentials provider chain invoking chain member #%zu",
(void *)provider,
wrapped_user_data->current_provider_index);
aws_credentials_provider_get_credentials(next_provider, s_aws_provider_chain_member_callback, wrapped_user_data);
return;
on_terminate_chain:
wrapped_user_data->original_callback(credentials, error_code, wrapped_user_data->original_user_data);
aws_credentials_provider_release(provider);
aws_mem_release(wrapped_user_data->allocator, wrapped_user_data);
}
static int s_credentials_provider_chain_get_credentials_async(
struct aws_credentials_provider *provider,
aws_on_get_credentials_callback_fn callback,
void *user_data) {
struct aws_credentials_provider_chain_impl *impl = provider->impl;
struct aws_credentials_provider *first_provider = NULL;
if (aws_array_list_get_at(&impl->providers, &first_provider, 0)) {
return AWS_OP_ERR;
}
struct aws_credentials_provider_chain_user_data *wrapped_user_data =
aws_mem_acquire(provider->allocator, sizeof(struct aws_credentials_provider_chain_user_data));
if (wrapped_user_data == NULL) {
return AWS_OP_ERR;
}
AWS_ZERO_STRUCT(*wrapped_user_data);
wrapped_user_data->allocator = provider->allocator;
wrapped_user_data->provider_chain = provider;
wrapped_user_data->current_provider_index = 0;
wrapped_user_data->original_user_data = user_data;
wrapped_user_data->original_callback = callback;
aws_credentials_provider_acquire(provider);
AWS_LOGF_DEBUG(
AWS_LS_AUTH_CREDENTIALS_PROVIDER,
"(id=%p) Credentials provider chain get credentials dispatch",
(void *)provider);
aws_credentials_provider_get_credentials(first_provider, s_aws_provider_chain_member_callback, wrapped_user_data);
return AWS_OP_SUCCESS;
}
static void s_credentials_provider_chain_destroy(struct aws_credentials_provider *provider) {
struct aws_credentials_provider_chain_impl *impl = provider->impl;
if (impl == NULL) {
return;
}
size_t provider_count = aws_array_list_length(&impl->providers);
for (size_t i = 0; i < provider_count; ++i) {
struct aws_credentials_provider *chain_member = NULL;
if (aws_array_list_get_at(&impl->providers, &chain_member, i)) {
continue;
}
aws_credentials_provider_release(chain_member);
}
/* Invoke our own shutdown callback */
aws_credentials_provider_invoke_shutdown_callback(provider);
aws_array_list_clean_up(&impl->providers);
aws_mem_release(provider->allocator, provider);
}
static struct aws_credentials_provider_vtable s_aws_credentials_provider_chain_vtable = {
.get_credentials = s_credentials_provider_chain_get_credentials_async,
.destroy = s_credentials_provider_chain_destroy,
};
struct aws_credentials_provider *aws_credentials_provider_new_chain(
struct aws_allocator *allocator,
const struct aws_credentials_provider_chain_options *options) {
if (options->provider_count == 0) {
return NULL;
}
struct aws_credentials_provider *provider = NULL;
struct aws_credentials_provider_chain_impl *impl = NULL;
aws_mem_acquire_many(
allocator,
2,
&provider,
sizeof(struct aws_credentials_provider),
&impl,
sizeof(struct aws_credentials_provider_chain_impl));
if (!provider) {
return NULL;
}
AWS_ZERO_STRUCT(*provider);
AWS_ZERO_STRUCT(*impl);
aws_credentials_provider_init_base(provider, allocator, &s_aws_credentials_provider_chain_vtable, impl);
if (aws_array_list_init_dynamic(
&impl->providers, allocator, options->provider_count, sizeof(struct aws_credentials_provider *))) {
goto on_error;
}
for (size_t i = 0; i < options->provider_count; ++i) {
struct aws_credentials_provider *sub_provider = options->providers[i];
if (aws_array_list_push_back(&impl->providers, &sub_provider)) {
goto on_error;
}
aws_credentials_provider_acquire(sub_provider);
}
provider->shutdown_options = options->shutdown_options;
return provider;
on_error:
aws_credentials_provider_destroy(provider);
return NULL;
}
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