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//
// Copyright 2020 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include <grpc/support/port_platform.h>
#include "src/core/lib/security/credentials/external/file_external_account_credentials.h"
#include <map>
#include <utility>
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include <grpc/slice.h>
#include <grpc/support/json.h>
#include "src/core/lib/iomgr/load_file.h"
#include "src/core/lib/json/json.h"
#include "src/core/lib/json/json_reader.h"
#include "src/core/lib/slice/slice.h"
#include "src/core/lib/slice/slice_internal.h"
namespace grpc_core {
RefCountedPtr<FileExternalAccountCredentials>
FileExternalAccountCredentials::Create(Options options,
std::vector<std::string> scopes,
grpc_error_handle* error) {
auto creds = MakeRefCounted<FileExternalAccountCredentials>(
std::move(options), std::move(scopes), error);
if (error->ok()) {
return creds;
} else {
return nullptr;
}
}
FileExternalAccountCredentials::FileExternalAccountCredentials(
Options options, std::vector<std::string> scopes, grpc_error_handle* error)
: ExternalAccountCredentials(options, std::move(scopes)) {
auto it = options.credential_source.object().find("file");
if (it == options.credential_source.object().end()) {
*error = GRPC_ERROR_CREATE("file field not present.");
return;
}
if (it->second.type() != Json::Type::kString) {
*error = GRPC_ERROR_CREATE("file field must be a string.");
return;
}
file_ = it->second.string();
it = options.credential_source.object().find("format");
if (it != options.credential_source.object().end()) {
const Json& format_json = it->second;
if (format_json.type() != Json::Type::kObject) {
*error = GRPC_ERROR_CREATE(
"The JSON value of credential source format is not an object.");
return;
}
auto format_it = format_json.object().find("type");
if (format_it == format_json.object().end()) {
*error = GRPC_ERROR_CREATE("format.type field not present.");
return;
}
if (format_it->second.type() != Json::Type::kString) {
*error = GRPC_ERROR_CREATE("format.type field must be a string.");
return;
}
format_type_ = format_it->second.string();
if (format_type_ == "json") {
format_it = format_json.object().find("subject_token_field_name");
if (format_it == format_json.object().end()) {
*error = GRPC_ERROR_CREATE(
"format.subject_token_field_name field must be present if the "
"format is in Json.");
return;
}
if (format_it->second.type() != Json::Type::kString) {
*error = GRPC_ERROR_CREATE(
"format.subject_token_field_name field must be a string.");
return;
}
format_subject_token_field_name_ = format_it->second.string();
}
}
}
void FileExternalAccountCredentials::RetrieveSubjectToken(
HTTPRequestContext* /*ctx*/, const Options& /*options*/,
std::function<void(std::string, grpc_error_handle)> cb) {
struct SliceWrapper {
~SliceWrapper() { CSliceUnref(slice); }
grpc_slice slice = grpc_empty_slice();
};
SliceWrapper content_slice;
// To retrieve the subject token, we read the file every time we make a
// request because it may have changed since the last request.
grpc_error_handle error =
grpc_load_file(file_.c_str(), 0, &content_slice.slice);
if (!error.ok()) {
cb("", error);
return;
}
absl::string_view content = StringViewFromSlice(content_slice.slice);
if (format_type_ == "json") {
auto content_json = JsonParse(content);
if (!content_json.ok() || content_json->type() != Json::Type::kObject) {
cb("", GRPC_ERROR_CREATE(
"The content of the file is not a valid json object."));
return;
}
auto content_it =
content_json->object().find(format_subject_token_field_name_);
if (content_it == content_json->object().end()) {
cb("", GRPC_ERROR_CREATE("Subject token field not present."));
return;
}
if (content_it->second.type() != Json::Type::kString) {
cb("", GRPC_ERROR_CREATE("Subject token field must be a string."));
return;
}
cb(content_it->second.string(), absl::OkStatus());
return;
}
cb(std::string(content), absl::OkStatus());
}
absl::string_view FileExternalAccountCredentials::CredentialSourceType() {
return "file";
}
} // namespace grpc_core
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