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271 lines (243 loc) · 8.72 KB
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using System.Text.Json;
namespace NpgsqlRestClient.Fido2;
internal static class RequestParsers
{
public readonly record struct AuthenticationOptionsRequest(string? UserName);
public readonly record struct RegistrationRequest(
string? ChallengeId,
string? CredentialId,
string? AttestationObject,
string? ClientDataJSON,
string[]? Transports,
string? DeviceName,
string? UserContext,
string? AnalyticsData);
public readonly record struct AuthenticationRequest(
string? ChallengeId,
string? CredentialId,
string? AuthenticatorData,
string? ClientDataJSON,
string? Signature,
string? UserHandle,
string? AnalyticsData);
public readonly record struct ClientDataParsed(
string? Type,
string? Challenge,
string? Origin,
bool? CrossOrigin);
public static AuthenticationOptionsRequest ParseAuthenticationOptionsRequest(ReadOnlySpan<byte> json)
{
if (json.IsEmpty)
return default;
var reader = new Utf8JsonReader(json);
string? userName = null;
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.PropertyName)
{
if (reader.ValueTextEquals("userName"u8))
{
reader.Read();
userName = reader.GetString();
}
else
{
reader.Skip();
}
}
}
return new AuthenticationOptionsRequest(userName);
}
public static RegistrationRequest ParseRegistrationRequest(ReadOnlySpan<byte> json)
{
if (json.IsEmpty)
return default;
var reader = new Utf8JsonReader(json);
string? challengeId = null, credentialId = null, attestationObject = null, clientDataJSON = null;
string? deviceName = null, userContext = null, analyticsData = null;
string[]? transports = null;
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.PropertyName)
{
if (reader.ValueTextEquals("challengeId"u8))
{
reader.Read();
challengeId = reader.GetString();
}
else if (reader.ValueTextEquals("credentialId"u8))
{
reader.Read();
credentialId = reader.GetString();
}
else if (reader.ValueTextEquals("attestationObject"u8))
{
reader.Read();
attestationObject = reader.GetString();
}
else if (reader.ValueTextEquals("clientDataJSON"u8))
{
reader.Read();
clientDataJSON = reader.GetString();
}
else if (reader.ValueTextEquals("transports"u8))
{
reader.Read();
transports = ParseStringArray(ref reader);
}
else if (reader.ValueTextEquals("deviceName"u8))
{
reader.Read();
deviceName = reader.GetString();
}
else if (reader.ValueTextEquals("userContext"u8))
{
reader.Read();
// Read the entire object as raw JSON
userContext = ReadRawJson(ref reader, json);
}
else if (reader.ValueTextEquals("analyticsData"u8))
{
reader.Read();
analyticsData = ReadRawJson(ref reader, json);
}
else
{
reader.Skip();
}
}
}
return new RegistrationRequest(
challengeId, credentialId, attestationObject, clientDataJSON,
transports, deviceName, userContext, analyticsData);
}
public static AuthenticationRequest ParseAuthenticationRequest(ReadOnlySpan<byte> json)
{
if (json.IsEmpty)
return default;
var reader = new Utf8JsonReader(json);
string? challengeId = null, credentialId = null, authenticatorData = null;
string? clientDataJSON = null, signature = null, userHandle = null, analyticsData = null;
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.PropertyName)
{
if (reader.ValueTextEquals("challengeId"u8))
{
reader.Read();
challengeId = reader.GetString();
}
else if (reader.ValueTextEquals("credentialId"u8))
{
reader.Read();
credentialId = reader.GetString();
}
else if (reader.ValueTextEquals("authenticatorData"u8))
{
reader.Read();
authenticatorData = reader.GetString();
}
else if (reader.ValueTextEquals("clientDataJSON"u8))
{
reader.Read();
clientDataJSON = reader.GetString();
}
else if (reader.ValueTextEquals("signature"u8))
{
reader.Read();
signature = reader.GetString();
}
else if (reader.ValueTextEquals("userHandle"u8))
{
reader.Read();
userHandle = reader.GetString();
}
else if (reader.ValueTextEquals("analyticsData"u8))
{
reader.Read();
analyticsData = ReadRawJson(ref reader, json);
}
else
{
reader.Skip();
}
}
}
return new AuthenticationRequest(
challengeId, credentialId, authenticatorData, clientDataJSON,
signature, userHandle, analyticsData);
}
public static ClientDataParsed ParseClientData(ReadOnlySpan<byte> json)
{
if (json.IsEmpty)
return default;
var reader = new Utf8JsonReader(json);
string? type = null, challenge = null, origin = null;
bool? crossOrigin = null;
while (reader.Read())
{
if (reader.TokenType == JsonTokenType.PropertyName)
{
if (reader.ValueTextEquals("type"u8))
{
reader.Read();
type = reader.GetString();
}
else if (reader.ValueTextEquals("challenge"u8))
{
reader.Read();
challenge = reader.GetString();
}
else if (reader.ValueTextEquals("origin"u8))
{
reader.Read();
origin = reader.GetString();
}
else if (reader.ValueTextEquals("crossOrigin"u8))
{
reader.Read();
crossOrigin = reader.GetBoolean();
}
else
{
reader.Skip();
}
}
}
return new ClientDataParsed(type, challenge, origin, crossOrigin);
}
private static string[]? ParseStringArray(ref Utf8JsonReader reader)
{
if (reader.TokenType != JsonTokenType.StartArray)
return null;
var list = new List<string>();
while (reader.Read() && reader.TokenType != JsonTokenType.EndArray)
{
if (reader.TokenType == JsonTokenType.String)
{
var value = reader.GetString();
if (value != null)
list.Add(value);
}
}
return list.Count > 0 ? list.ToArray() : null;
}
private static string? ReadRawJson(ref Utf8JsonReader reader, ReadOnlySpan<byte> json)
{
if (reader.TokenType == JsonTokenType.Null)
return null;
if (reader.TokenType == JsonTokenType.StartObject)
{
var startDepth = reader.CurrentDepth;
var start = (int)reader.TokenStartIndex;
while (reader.Read() && !(reader.TokenType == JsonTokenType.EndObject && reader.CurrentDepth == startDepth)) { }
var end = (int)reader.TokenStartIndex + 1;
return System.Text.Encoding.UTF8.GetString(json.Slice(start, end - start));
}
if (reader.TokenType == JsonTokenType.String)
{
return reader.GetString();
}
return null;
}
}
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