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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_checksums.h"
#include <aws/common/encoding.h>
#include <aws/common/string.h>
#include <aws/io/stream.h>
#include <inttypes.h>
AWS_STATIC_STRING_FROM_LITERAL(s_carriage_return, "\r\n");
AWS_STATIC_STRING_FROM_LITERAL(s_empty_chunk, "0\r\n");
AWS_STATIC_STRING_FROM_LITERAL(s_final_chunk, "\r\n0\r\n");
AWS_STATIC_STRING_FROM_LITERAL(s_colon, ":");
AWS_STATIC_STRING_FROM_LITERAL(s_post_trailer, "\r\n\r\n");
struct aws_chunk_stream;
typedef int(set_stream_fn)(struct aws_chunk_stream *parent_stream);
struct aws_chunk_stream {
struct aws_input_stream base;
struct aws_allocator *allocator;
/* aws_input_stream_byte_cursor provides our actual functionality */
/* Pointing to the stream we read from */
struct aws_input_stream *current_stream;
struct aws_input_stream *checksum_stream;
struct aws_byte_buf checksum_result;
struct aws_byte_buf *checksum_result_output;
struct aws_byte_buf pre_chunk_buffer;
struct aws_byte_buf post_chunk_buffer;
const struct aws_byte_cursor *checksum_header_name;
int64_t length;
set_stream_fn *set_current_stream_fn;
};
static int s_set_null_stream(struct aws_chunk_stream *parent_stream) {
aws_input_stream_release(parent_stream->current_stream);
parent_stream->current_stream = NULL;
parent_stream->set_current_stream_fn = NULL;
aws_byte_buf_clean_up(&parent_stream->post_chunk_buffer);
return AWS_OP_SUCCESS;
}
static int s_set_post_chunk_stream(struct aws_chunk_stream *parent_stream) {
int64_t current_stream_length;
if (aws_input_stream_get_length(parent_stream->current_stream, ¤t_stream_length)) {
aws_input_stream_release(parent_stream->current_stream);
return AWS_OP_ERR;
}
aws_input_stream_release(parent_stream->current_stream);
struct aws_byte_cursor final_chunk_cursor;
if (current_stream_length > 0) {
final_chunk_cursor = aws_byte_cursor_from_string(s_final_chunk);
} else {
final_chunk_cursor = aws_byte_cursor_from_string(s_empty_chunk);
}
struct aws_byte_cursor post_trailer_cursor = aws_byte_cursor_from_string(s_post_trailer);
struct aws_byte_cursor colon_cursor = aws_byte_cursor_from_string(s_colon);
if (parent_stream->checksum_result.len == 0) {
AWS_LOGF_ERROR(AWS_LS_S3_META_REQUEST, "Failed to extract base64 encoded checksum of stream");
return aws_raise_error(AWS_ERROR_S3_CHECKSUM_CALCULATION_FAILED);
}
struct aws_byte_cursor checksum_result_cursor = aws_byte_cursor_from_buf(&parent_stream->checksum_result);
if (parent_stream->checksum_result_output &&
aws_byte_buf_init_copy_from_cursor(
parent_stream->checksum_result_output, parent_stream->allocator, checksum_result_cursor)) {
return AWS_OP_ERR;
}
if (aws_byte_buf_init(
&parent_stream->post_chunk_buffer,
parent_stream->allocator,
final_chunk_cursor.len + parent_stream->checksum_header_name->len + colon_cursor.len +
checksum_result_cursor.len + post_trailer_cursor.len)) {
goto error;
}
if (aws_byte_buf_append(&parent_stream->post_chunk_buffer, &final_chunk_cursor) ||
aws_byte_buf_append(&parent_stream->post_chunk_buffer, parent_stream->checksum_header_name) ||
aws_byte_buf_append(&parent_stream->post_chunk_buffer, &colon_cursor) ||
aws_byte_buf_append(&parent_stream->post_chunk_buffer, &checksum_result_cursor) ||
aws_byte_buf_append(&parent_stream->post_chunk_buffer, &post_trailer_cursor)) {
goto error;
}
struct aws_byte_cursor post_chunk_cursor = aws_byte_cursor_from_buf(&parent_stream->post_chunk_buffer);
parent_stream->current_stream = aws_input_stream_new_from_cursor(parent_stream->allocator, &post_chunk_cursor);
parent_stream->set_current_stream_fn = s_set_null_stream;
return AWS_OP_SUCCESS;
error:
aws_byte_buf_clean_up(parent_stream->checksum_result_output);
aws_byte_buf_clean_up(&parent_stream->post_chunk_buffer);
return AWS_OP_ERR;
}
static int s_set_chunk_stream(struct aws_chunk_stream *parent_stream) {
aws_input_stream_release(parent_stream->current_stream);
parent_stream->current_stream = parent_stream->checksum_stream;
aws_byte_buf_clean_up(&parent_stream->pre_chunk_buffer);
parent_stream->checksum_stream = NULL;
parent_stream->set_current_stream_fn = s_set_post_chunk_stream;
return AWS_OP_SUCCESS;
}
static int s_aws_input_chunk_stream_seek(
struct aws_input_stream *stream,
int64_t offset,
enum aws_stream_seek_basis basis) {
(void)stream;
(void)offset;
(void)basis;
AWS_LOGF_ERROR(
AWS_LS_S3_CLIENT,
"Cannot seek on chunk stream, as it will cause the checksum output to mismatch the checksum of the stream"
"contents");
AWS_ASSERT(false);
return aws_raise_error(AWS_ERROR_UNSUPPORTED_OPERATION);
}
static int s_aws_input_chunk_stream_read(struct aws_input_stream *stream, struct aws_byte_buf *dest) {
struct aws_chunk_stream *impl = AWS_CONTAINER_OF(stream, struct aws_chunk_stream, base);
struct aws_stream_status status;
AWS_ZERO_STRUCT(status);
while (impl->current_stream != NULL && dest->len < dest->capacity) {
int err = aws_input_stream_read(impl->current_stream, dest);
if (err) {
return err;
}
if (aws_input_stream_get_status(impl->current_stream, &status)) {
return AWS_OP_ERR;
}
if (status.is_end_of_stream && impl->set_current_stream_fn(impl)) {
return AWS_OP_ERR;
}
}
return AWS_OP_SUCCESS;
}
static int s_aws_input_chunk_stream_get_status(struct aws_input_stream *stream, struct aws_stream_status *status) {
struct aws_chunk_stream *impl = AWS_CONTAINER_OF(stream, struct aws_chunk_stream, base);
if (impl->current_stream == NULL) {
status->is_end_of_stream = true;
status->is_valid = true;
return AWS_OP_SUCCESS;
}
int res = aws_input_stream_get_status(impl->current_stream, status);
if (res != AWS_OP_SUCCESS) {
/* Only when the current_stream is NULL, it is end of stream, as the current stream will be updated to feed to
* data */
status->is_end_of_stream = false;
}
return res;
}
static int s_aws_input_chunk_stream_get_length(struct aws_input_stream *stream, int64_t *out_length) {
struct aws_chunk_stream *impl = AWS_CONTAINER_OF(stream, struct aws_chunk_stream, base);
*out_length = impl->length;
return AWS_OP_SUCCESS;
}
static void s_aws_input_chunk_stream_destroy(struct aws_chunk_stream *impl) {
if (impl) {
if (impl->current_stream) {
aws_input_stream_release(impl->current_stream);
}
if (impl->checksum_stream) {
aws_input_stream_release(impl->checksum_stream);
}
aws_byte_buf_clean_up(&impl->pre_chunk_buffer);
aws_byte_buf_clean_up(&impl->checksum_result);
aws_byte_buf_clean_up(&impl->post_chunk_buffer);
aws_mem_release(impl->allocator, impl);
}
}
static struct aws_input_stream_vtable s_aws_input_chunk_stream_vtable = {
.seek = s_aws_input_chunk_stream_seek,
.read = s_aws_input_chunk_stream_read,
.get_status = s_aws_input_chunk_stream_get_status,
.get_length = s_aws_input_chunk_stream_get_length,
};
struct aws_input_stream *aws_chunk_stream_new(
struct aws_allocator *allocator,
struct aws_input_stream *existing_stream,
enum aws_s3_checksum_algorithm algorithm,
struct aws_byte_buf *checksum_output) {
struct aws_chunk_stream *impl = aws_mem_calloc(allocator, 1, sizeof(struct aws_chunk_stream));
impl->allocator = allocator;
impl->base.vtable = &s_aws_input_chunk_stream_vtable;
impl->checksum_result_output = checksum_output;
int64_t stream_length = 0;
int64_t final_chunk_len = 0;
if (aws_input_stream_get_length(existing_stream, &stream_length)) {
goto error;
}
struct aws_byte_cursor pre_chunk_cursor = aws_byte_cursor_from_string(s_carriage_return);
char stream_length_string[32];
AWS_ZERO_ARRAY(stream_length_string);
snprintf(stream_length_string, AWS_ARRAY_SIZE(stream_length_string), "%" PRIX64, stream_length);
struct aws_string *stream_length_aws_string = aws_string_new_from_c_str(allocator, stream_length_string);
struct aws_byte_cursor stream_length_cursor = aws_byte_cursor_from_string(stream_length_aws_string);
if (aws_byte_buf_init(&impl->pre_chunk_buffer, allocator, stream_length_cursor.len + pre_chunk_cursor.len)) {
goto error;
}
if (aws_byte_buf_append(&impl->pre_chunk_buffer, &stream_length_cursor)) {
goto error;
}
aws_string_destroy(stream_length_aws_string);
if (aws_byte_buf_append(&impl->pre_chunk_buffer, &pre_chunk_cursor)) {
goto error;
}
size_t checksum_len = aws_get_digest_size_from_algorithm(algorithm);
size_t encoded_checksum_len = 0;
if (aws_base64_compute_encoded_len(checksum_len, &encoded_checksum_len)) {
goto error;
}
if (aws_byte_buf_init(&impl->checksum_result, allocator, encoded_checksum_len)) {
goto error;
}
impl->checksum_stream = aws_checksum_stream_new(allocator, existing_stream, algorithm, &impl->checksum_result);
if (impl->checksum_stream == NULL) {
goto error;
}
int64_t prechunk_stream_len = 0;
int64_t colon_len = s_colon->len;
int64_t post_trailer_len = s_post_trailer->len;
struct aws_byte_cursor complete_pre_chunk_cursor = aws_byte_cursor_from_buf(&impl->pre_chunk_buffer);
if (stream_length > 0) {
impl->current_stream = aws_input_stream_new_from_cursor(allocator, &complete_pre_chunk_cursor);
final_chunk_len = s_final_chunk->len;
if (impl->current_stream == NULL) {
goto error;
}
impl->set_current_stream_fn = s_set_chunk_stream;
} else {
impl->current_stream = impl->checksum_stream;
final_chunk_len = s_empty_chunk->len;
impl->checksum_stream = NULL;
impl->set_current_stream_fn = s_set_post_chunk_stream;
}
impl->checksum_header_name = aws_get_http_header_name_from_algorithm(algorithm);
if (aws_input_stream_get_length(impl->current_stream, &prechunk_stream_len)) {
goto error;
}
/* we subtract one since aws_base64_compute_encoded_len accounts for the null terminator which won't show up in our
* stream */
impl->length = prechunk_stream_len + stream_length + final_chunk_len + impl->checksum_header_name->len + colon_len +
encoded_checksum_len + post_trailer_len - 1;
AWS_ASSERT(impl->current_stream);
aws_ref_count_init(&impl->base.ref_count, impl, (aws_simple_completion_callback *)s_aws_input_chunk_stream_destroy);
return &impl->base;
error:
aws_input_stream_release(impl->checksum_stream);
aws_input_stream_release(impl->current_stream);
aws_byte_buf_clean_up(&impl->pre_chunk_buffer);
aws_byte_buf_clean_up(&impl->checksum_result);
aws_mem_release(impl->allocator, impl);
return NULL;
}
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