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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include "aws/s3/private/s3_checksum_context.h"
#include "aws/s3/private/s3_checksums.h"
#include <aws/common/encoding.h>
#include <aws/common/logging.h>
static void s_lock_synced_data(struct aws_s3_upload_request_checksum_context *context) {
aws_mutex_lock(&context->synced_data.lock);
}
static void s_unlock_synced_data(struct aws_s3_upload_request_checksum_context *context) {
aws_mutex_unlock(&context->synced_data.lock);
}
static void s_aws_s3_upload_request_checksum_context_destroy(void *context) {
struct aws_s3_upload_request_checksum_context *checksum_context = context;
aws_byte_buf_clean_up(&checksum_context->synced_data.base64_checksum);
aws_mutex_clean_up(&checksum_context->synced_data.lock);
aws_mem_release(checksum_context->allocator, checksum_context);
}
static struct aws_s3_upload_request_checksum_context *s_s3_upload_request_checksum_context_new_base(
struct aws_allocator *allocator,
const struct aws_s3_meta_request_checksum_config_storage *checksum_config) {
AWS_PRECONDITION(allocator);
struct aws_s3_upload_request_checksum_context *context =
aws_mem_calloc(allocator, 1, sizeof(struct aws_s3_upload_request_checksum_context));
aws_ref_count_init(&context->ref_count, context, s_aws_s3_upload_request_checksum_context_destroy);
context->allocator = allocator;
if (aws_mutex_init(&context->synced_data.lock)) {
aws_s3_upload_request_checksum_context_release(context);
return NULL;
}
/* Handle case where no checksum config is provided */
if (!checksum_config || checksum_config->checksum_algorithm == AWS_SCA_NONE) {
context->algorithm = AWS_SCA_NONE;
context->encoded_checksum_size = 0;
return context;
}
/* Extract configuration */
context->algorithm = checksum_config->checksum_algorithm;
context->location = checksum_config->location;
context->encoded_checksum_size = aws_get_digest_size_from_checksum_algorithm(context->algorithm);
/* Convert to base64 encoded size */
size_t encoded_size = 0;
if (aws_base64_compute_encoded_len(context->encoded_checksum_size, &encoded_size)) {
AWS_LOGF_ERROR(AWS_LS_S3_GENERAL, "Failed to compute base64 encoded length for checksum");
aws_s3_upload_request_checksum_context_release(context);
return NULL;
}
context->encoded_checksum_size = encoded_size;
return context;
}
struct aws_s3_upload_request_checksum_context *aws_s3_upload_request_checksum_context_new(
struct aws_allocator *allocator,
const struct aws_s3_meta_request_checksum_config_storage *checksum_config) {
struct aws_s3_upload_request_checksum_context *context =
s_s3_upload_request_checksum_context_new_base(allocator, checksum_config);
if (context && context->encoded_checksum_size > 0) {
/* Initial the buffer for checksum */
aws_byte_buf_init(&context->synced_data.base64_checksum, allocator, context->encoded_checksum_size);
}
return context;
}
struct aws_s3_upload_request_checksum_context *aws_s3_upload_request_checksum_context_new_with_existing_base64_checksum(
struct aws_allocator *allocator,
const struct aws_s3_meta_request_checksum_config_storage *checksum_config,
struct aws_byte_cursor existing_base64_checksum) {
struct aws_s3_upload_request_checksum_context *context =
s_s3_upload_request_checksum_context_new_base(allocator, checksum_config);
if (context) {
/* Initial the buffer for checksum from the exist checksum */
if (context->encoded_checksum_size != existing_base64_checksum.len) {
struct aws_byte_cursor algo_name = aws_get_checksum_algorithm_name(context->algorithm);
AWS_LOGF_ERROR(
AWS_LS_S3_GENERAL,
"Encoded checksum size mismatch during creating the context for algorithm " PRInSTR
": expected %zu bytes, got %zu bytes",
AWS_BYTE_CURSOR_PRI(algo_name),
context->encoded_checksum_size,
existing_base64_checksum.len);
aws_s3_upload_request_checksum_context_release(context);
return NULL;
}
aws_byte_buf_init_copy_from_cursor(&context->synced_data.base64_checksum, allocator, existing_base64_checksum);
context->synced_data.checksum_calculated = true;
}
return context;
}
struct aws_s3_upload_request_checksum_context *aws_s3_upload_request_checksum_context_acquire(
struct aws_s3_upload_request_checksum_context *context) {
if (context) {
aws_ref_count_acquire(&context->ref_count);
}
return context;
}
struct aws_s3_upload_request_checksum_context *aws_s3_upload_request_checksum_context_release(
struct aws_s3_upload_request_checksum_context *context) {
if (context) {
aws_ref_count_release(&context->ref_count);
}
return NULL;
}
bool aws_s3_upload_request_checksum_context_should_calculate(struct aws_s3_upload_request_checksum_context *context) {
if (!context || context->algorithm == AWS_SCA_NONE) {
return false;
}
bool should_calculate = false;
s_lock_synced_data(context);
/* If not previous calculated */
should_calculate = !context->synced_data.checksum_calculated;
s_unlock_synced_data(context);
return should_calculate;
}
bool aws_s3_upload_request_checksum_context_should_add_header(
const struct aws_s3_upload_request_checksum_context *context) {
if (!context) {
return false;
}
return context->location == AWS_SCL_HEADER && context->algorithm != AWS_SCA_NONE;
}
bool aws_s3_upload_request_checksum_context_should_add_trailer(
const struct aws_s3_upload_request_checksum_context *context) {
if (!context) {
return false;
}
return context->location == AWS_SCL_TRAILER && context->algorithm != AWS_SCA_NONE;
}
int aws_s3_upload_request_checksum_context_finalize_checksum(
struct aws_s3_upload_request_checksum_context *context,
struct aws_byte_cursor raw_checksum_cursor) {
if (!context) {
return aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
}
s_lock_synced_data(context);
/* If not previous calculated */
if (!context->synced_data.checksum_calculated) {
AWS_ASSERT(context->synced_data.base64_checksum.len == 0);
if (aws_base64_encode(&raw_checksum_cursor, &context->synced_data.base64_checksum)) {
aws_byte_buf_reset(&context->synced_data.base64_checksum, false);
AWS_LOGF_ERROR(
AWS_LS_S3_GENERAL,
"Failed to base64 encode for the checksum. Raw checksum length: %zu. Output buffer capacity: %zu "
"length %zu",
raw_checksum_cursor.len,
context->synced_data.base64_checksum.capacity,
context->synced_data.base64_checksum.len);
s_unlock_synced_data(context);
return AWS_OP_ERR;
}
context->synced_data.checksum_calculated = true;
}
s_unlock_synced_data(context);
return AWS_OP_SUCCESS;
}
struct aws_byte_cursor aws_s3_upload_request_checksum_context_get_checksum_cursor(
struct aws_s3_upload_request_checksum_context *context) {
struct aws_byte_cursor checksum_cursor = {0};
if (!context) {
return checksum_cursor;
}
s_lock_synced_data(context);
/* If not previous calculated */
if (context->synced_data.checksum_calculated) {
checksum_cursor = aws_byte_cursor_from_buf(&context->synced_data.base64_checksum);
}
s_unlock_synced_data(context);
return checksum_cursor;
}
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