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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/sms/sms_parser.h"
#include <string>
#include <string_view>
#include <utility>
#include "net/base/url_util.h"
#include "third_party/re2/src/re2/re2.h"
#include "url/gurl.h"
#include "url/origin.h"
namespace content {
namespace {
// SMS one-time-passcode format:
// https://wicg.github.io/sms-one-time-codes/#parsing
constexpr char kOtpFormatRegex[] =
"(?:^|\\s)" // Leading characters
"@([a-zA-Z0-9.-]+) " // Domain
"#([^#\\s]+)" // OTP
"(?: @([a-zA-Z0-9.-]+))?"; // Optional domain
using SmsParsingStatus = SmsParser::SmsParsingStatus;
using ParseDomainResult = std::tuple<SmsParsingStatus, GURL>;
ParseDomainResult ParseDomain(const std::string& domain) {
std::string host, scheme;
int port;
if (!net::ParseHostAndPort(domain, &host, &port))
return std::make_tuple(SmsParsingStatus::kHostAndPortNotParsed, GURL());
// Expect localhost to always be http.
if (net::HostStringIsLocalhost(std::string_view(host))) {
scheme = "http://";
} else {
scheme = "https://";
}
GURL gurl = GURL(scheme + domain);
if (!gurl.is_valid())
return std::make_tuple(SmsParsingStatus::kGURLNotValid, GURL());
return std::make_tuple(SmsParsingStatus::kParsed, gurl);
}
} // namespace
SmsParser::Result::Result(SmsParsingStatus status) : parsing_status(status) {
DCHECK(parsing_status != SmsParsingStatus::kParsed);
}
SmsParser::Result::Result(const url::Origin& top_origin,
const url::Origin& embedded_origin,
const std::string& one_time_code)
: top_origin(std::move(top_origin)),
embedded_origin(std::move(embedded_origin)),
one_time_code(one_time_code) {
parsing_status = SmsParsingStatus::kParsed;
}
SmsParser::Result::Result(const Result& other) = default;
SmsParser::Result::~Result() = default;
SmsFetcher::OriginList SmsParser::Result::GetOriginList() const {
DCHECK(IsValid());
SmsFetcher::OriginList origin_list;
if (!embedded_origin.opaque())
origin_list.push_back(embedded_origin);
origin_list.push_back(top_origin);
return origin_list;
}
// static
SmsParser::Result SmsParser::Parse(std::string_view sms) {
std::string top_domain, otp, embedded_domain;
// TODO(yigu): The existing kOtpFormatRegex may filter out invalid SMSes that
// would fall into |kHostAndPortNotParsed| or |kGURLNotValid| below. We should
// clean up the code if the statement is confirmed by metrics.
if (!re2::RE2::PartialMatch(std::string(sms), kOtpFormatRegex, &top_domain,
&otp, &embedded_domain))
return Result(SmsParsingStatus::kOTPFormatRegexNotMatch);
auto [top_domain_parsing_status, top_gurl] = ParseDomain(top_domain);
if (top_domain_parsing_status != SmsParsingStatus::kParsed)
return Result(top_domain_parsing_status);
DCHECK(top_gurl.is_valid());
url::Origin top_origin = url::Origin::Create(top_gurl);
DCHECK(!top_origin.opaque());
if (embedded_domain == "")
return Result(top_origin, url::Origin(), otp);
auto [embedded_domain_parsing_status, embedded_gurl] =
ParseDomain(embedded_domain);
if (embedded_domain_parsing_status != SmsParsingStatus::kParsed)
return Result(embedded_domain_parsing_status);
DCHECK(embedded_gurl.is_valid());
url::Origin embedded_origin = url::Origin::Create(embedded_gurl);
DCHECK(!embedded_origin.opaque());
return Result(top_origin, embedded_origin, otp);
}
} // namespace content
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