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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/device_bound_sessions/session_json_utils.h"
#include "base/json/json_reader.h"
namespace net::device_bound_sessions {
namespace {
SessionParams::Scope ParseScope(const base::Value::Dict& scope_dict) {
SessionParams::Scope scope;
std::optional<bool> include_site = scope_dict.FindBool("include_site");
scope.include_site = include_site.value_or(false);
const std::string* origin = scope_dict.FindString("origin");
scope.origin = origin ? *origin : "";
const base::Value::List* specifications_list =
scope_dict.FindList("scope_specification");
if (!specifications_list) {
return scope;
}
for (const auto& specification : *specifications_list) {
const base::Value::Dict* specification_dict = specification.GetIfDict();
if (!specification_dict) {
continue;
}
const std::string* type = specification_dict->FindString("type");
const std::string* domain = specification_dict->FindString("domain");
const std::string* path = specification_dict->FindString("path");
if (type && !type->empty() && domain && !domain->empty() && path &&
!path->empty()) {
if (*type == "include") {
scope.specifications.push_back(SessionParams::Scope::Specification{
SessionParams::Scope::Specification::Type::kInclude, *domain,
*path});
} else if (*type == "exclude") {
scope.specifications.push_back(SessionParams::Scope::Specification{
SessionParams::Scope::Specification::Type::kExclude, *domain,
*path});
}
}
}
return scope;
}
std::vector<SessionParams::Credential> ParseCredentials(
const base::Value::List& credentials_list) {
std::vector<SessionParams::Credential> cookie_credentials;
for (const auto& json_credential : credentials_list) {
SessionParams::Credential credential;
const base::Value::Dict* credential_dict = json_credential.GetIfDict();
if (!credential_dict) {
continue;
}
const std::string* type = credential_dict->FindString("type");
if (!type || *type != "cookie") {
continue;
}
const std::string* name = credential_dict->FindString("name");
const std::string* attributes = credential_dict->FindString("attributes");
if (name && attributes) {
cookie_credentials.push_back(
SessionParams::Credential{*name, *attributes});
}
}
return cookie_credentials;
}
} // namespace
base::expected<SessionParams, SessionError> ParseSessionInstructionJson(
GURL fetcher_url,
unexportable_keys::UnexportableKeyId key_id,
std::string_view response_json) {
// TODO(kristianm): Skip XSSI-escapes, see for example:
// https://hg.mozilla.org/mozilla-central/rev/4cee9ec9155e
// Discuss with others if XSSI should be part of the standard.
// TODO(kristianm): Decide if the standard should require parsing
// to fail fully if any item is wrong, or if that item should be
// ignored.
net::SchemefulSite fetcher_site(fetcher_url);
std::optional<base::Value::Dict> maybe_root = base::JSONReader::ReadDict(
response_json, base::JSON_PARSE_RFC, /*max_depth=*/5u);
if (!maybe_root) {
return base::unexpected(
SessionError{SessionError::ErrorType::kInvalidConfigJson, fetcher_site,
/*session_id=*/std::nullopt});
}
base::Value::Dict* scope_dict = maybe_root->FindDict("scope");
std::string* session_id = maybe_root->FindString("session_identifier");
if (!session_id || session_id->empty()) {
return base::unexpected(
SessionError{SessionError::ErrorType::kInvalidSessionId, fetcher_site,
/*session_id=*/std::nullopt});
}
std::optional<bool> continue_value = maybe_root->FindBool("continue");
if (continue_value.has_value() && *continue_value == false) {
return base::unexpected(
SessionError{SessionError::ErrorType::kServerRequestedTermination,
fetcher_site, *session_id});
}
std::string* refresh_url = maybe_root->FindString("refresh_url");
std::vector<SessionParams::Credential> credentials;
base::Value::List* credentials_list = maybe_root->FindList("credentials");
if (credentials_list) {
credentials = ParseCredentials(*credentials_list);
}
if (credentials.empty()) {
return base::unexpected(
SessionError{SessionError::ErrorType::kInvalidCredentials, fetcher_site,
/*session_id=*/std::nullopt});
}
return SessionParams(
*session_id, fetcher_url, refresh_url ? *refresh_url : "",
scope_dict ? ParseScope(*scope_dict) : SessionParams::Scope{},
std::move(credentials), key_id);
}
} // namespace net::device_bound_sessions
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