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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 "remoting/signaling/signaling_id_util.h"
#include <stddef.h>
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/uuid.h"
namespace remoting {
namespace {
constexpr char kFtlResourcePrefix[] = "chromoting_ftl_";
constexpr char kGmailDomain[] = "gmail.com";
constexpr char kGooglemailDomain[] = "googlemail.com";
} // namespace
std::string NormalizeSignalingId(const std::string& id) {
std::string email;
std::string resource;
if (SplitSignalingIdResource(id, &email, &resource)) {
std::string normalized_email = resource.find(kFtlResourcePrefix) == 0
? GetCanonicalEmail(email)
: base::ToLowerASCII(email);
return normalized_email + "/" + resource;
}
return base::ToLowerASCII(email);
}
std::string GetCanonicalEmail(const std::string& email) {
DCHECK(email.find('/') == std::string::npos)
<< "This function expects an email address, not a signaling ID.";
std::string canonical_email = base::ToLowerASCII(email);
base::TrimString(canonical_email, base::kWhitespaceASCII, &canonical_email);
size_t at_index = canonical_email.find('@');
if (at_index == std::string::npos) {
LOG(ERROR) << "Unexpected email address. Character '@' is missing.";
return canonical_email;
}
std::string username = canonical_email.substr(0, at_index);
std::string domain = canonical_email.substr(at_index + 1);
if (domain == kGmailDomain || domain == kGooglemailDomain) {
// GMail/GoogleMail domains ignore dots, whereas other domains may not.
base::RemoveChars(username, ".", &username);
return username + '@' + kGmailDomain;
}
return canonical_email;
}
bool SplitSignalingIdResource(const std::string& full_id,
std::string* email,
std::string* resource) {
size_t slash_index = full_id.find('/');
if (slash_index == std::string::npos) {
if (email) {
*email = full_id;
}
if (resource) {
resource->clear();
}
return false;
}
if (email) {
*email = full_id.substr(0, slash_index);
}
if (resource) {
*resource = full_id.substr(slash_index + 1);
}
return true;
}
bool IsValidFtlSignalingId(const std::string& signaling_id) {
std::string email;
std::string resource;
if (!SplitSignalingIdResource(signaling_id, &email, &resource)) {
LOG(ERROR) << "Failed to split signaling id: " << signaling_id;
return false;
}
if (!base::StartsWith(resource, kFtlResourcePrefix)) {
LOG(ERROR) << "Signaling id resource does not start with a valid prefix: "
<< resource;
return false;
}
std::string registration_id = resource.substr(sizeof(kFtlResourcePrefix) - 1);
if (!base::Uuid::ParseLowercase(registration_id).is_valid()) {
LOG(ERROR) << "Signaling id contains an invalid registration id: "
<< registration_id;
return false;
}
return true;
}
} // namespace remoting
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