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// Copyright Epic Games, Inc. All Rights Reserved.
#include <zenstore/cache/cache.h>
#include <zencore/logging.h>
namespace zen {
namespace {
constinit AsciiSet ValidNamespaceNameCharactersSet{"abcdefghijklmnopqrstuvwxyz0123456789-_.ABCDEFGHIJKLMNOPQRSTUVWXYZ"};
constinit AsciiSet ValidBucketNameCharactersSet{"abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"};
} // namespace
std::optional<std::string>
GetValidNamespaceName(std::string_view Name)
{
if (Name.empty())
{
ZEN_WARN("Namespace is invalid, empty namespace is not allowed");
return {};
}
if (Name.length() > 64)
{
ZEN_WARN("Namespace '{}' is invalid, length exceeds 64 characters", Name);
return {};
}
if (!AsciiSet::HasOnly(Name, ValidNamespaceNameCharactersSet))
{
ZEN_WARN("Namespace '{}' is invalid, invalid characters detected", Name);
return {};
}
return ToLower(Name);
}
std::optional<std::string>
GetValidBucketName(std::string_view Name)
{
if (Name.empty())
{
ZEN_WARN("Bucket name is invalid, empty bucket name is not allowed");
return {};
}
if (!AsciiSet::HasOnly(Name, ValidBucketNameCharactersSet))
{
ZEN_WARN("Bucket name '{}' is invalid, invalid characters detected", Name);
return {};
}
return ToLower(Name);
}
std::optional<IoHash>
GetValidIoHash(std::string_view Hash)
{
if (Hash.length() != IoHash::StringLength)
{
return {};
}
IoHash KeyHash;
if (!ParseHexBytes(Hash.data(), Hash.size(), KeyHash.Hash))
{
return {};
}
return KeyHash;
}
bool
HttpCacheRequestParseRelativeUri(std::string_view Key, std::string_view DefaultNamespace, HttpCacheRequestData& Data)
{
std::vector<std::string_view> Tokens;
uint32_t TokenCount = ForEachStrTok(Key, '/', [&](const std::string_view& Token) {
Tokens.push_back(Token);
return true;
});
switch (TokenCount)
{
case 0:
return true;
case 1:
Data.Namespace = GetValidNamespaceName(Tokens[0]);
return Data.Namespace.has_value();
case 2:
{
std::optional<IoHash> PossibleHashKey = GetValidIoHash(Tokens[1]);
if (PossibleHashKey.has_value())
{
// Legacy bucket/key request
Data.Bucket = GetValidBucketName(Tokens[0]);
if (!Data.Bucket.has_value())
{
return false;
}
Data.HashKey = PossibleHashKey;
Data.Namespace = DefaultNamespace;
return true;
}
Data.Namespace = GetValidNamespaceName(Tokens[0]);
if (!Data.Namespace.has_value())
{
return false;
}
Data.Bucket = GetValidBucketName(Tokens[1]);
if (!Data.Bucket.has_value())
{
return false;
}
return true;
}
case 3:
{
std::optional<IoHash> PossibleHashKey = GetValidIoHash(Tokens[1]);
if (PossibleHashKey.has_value())
{
// Legacy bucket/key/valueid request
Data.Bucket = GetValidBucketName(Tokens[0]);
if (!Data.Bucket.has_value())
{
return false;
}
Data.HashKey = PossibleHashKey;
Data.ValueContentId = GetValidIoHash(Tokens[2]);
if (!Data.ValueContentId.has_value())
{
return false;
}
Data.Namespace = DefaultNamespace;
return true;
}
Data.Namespace = GetValidNamespaceName(Tokens[0]);
if (!Data.Namespace.has_value())
{
return false;
}
Data.Bucket = GetValidBucketName(Tokens[1]);
if (!Data.Bucket.has_value())
{
return false;
}
Data.HashKey = GetValidIoHash(Tokens[2]);
if (!Data.HashKey)
{
return false;
}
return true;
}
case 4:
{
Data.Namespace = GetValidNamespaceName(Tokens[0]);
if (!Data.Namespace.has_value())
{
return false;
}
Data.Bucket = GetValidBucketName(Tokens[1]);
if (!Data.Bucket.has_value())
{
return false;
}
Data.HashKey = GetValidIoHash(Tokens[2]);
if (!Data.HashKey.has_value())
{
return false;
}
Data.ValueContentId = GetValidIoHash(Tokens[3]);
if (!Data.ValueContentId.has_value())
{
return false;
}
return true;
}
default:
return false;
}
}
std::optional<std::string>
GetCacheRequestNamespace(const CbObjectView& Params)
{
CbFieldView NamespaceField = Params["Namespace"];
if (!NamespaceField)
{
return std::string("!default!"); // ZenCacheStore::DefaultNamespace);
}
if (NamespaceField.HasError())
{
return {};
}
if (!NamespaceField.IsString())
{
return {};
}
return GetValidNamespaceName(NamespaceField.AsString());
}
bool
GetCacheRequestCacheKey(const CbObjectView& KeyView, CacheKey& Key)
{
CbFieldView BucketField = KeyView["Bucket"];
if (BucketField.HasError())
{
return false;
}
if (!BucketField.IsString())
{
return false;
}
std::optional<std::string> Bucket = GetValidBucketName(BucketField.AsString());
if (!Bucket.has_value())
{
return false;
}
CbFieldView HashField = KeyView["Hash"];
if (HashField.HasError())
{
return false;
}
if (!HashField.IsHash())
{
return false;
}
Key.Bucket = *Bucket;
Key.Hash = HashField.AsHash();
return true;
}
} // namespace zen
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