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using System.Security.Claims;
using System.Text;
using Npgsql;
using NpgsqlRest.Auth;
using NpgsqlTypes;
namespace NpgsqlRest;
public static class Ext
{
public static void CreateAndOpenSourceConnection(this NpgsqlRestOptions options,
IServiceProvider? serviceProvider,
ref NpgsqlConnection? connection,
ref bool shouldDispose)
{
// Try named connection first (check DataSources for multi-host, then ConnectionStrings)
if (options.MetadataQueryConnectionName is not null)
{
// First check if there's a data source for this connection name (for multi-host support)
if (options.DataSources?.TryGetValue(options.MetadataQueryConnectionName, out var namedDataSource) is true)
{
connection = namedDataSource.OpenConnection();
shouldDispose = true;
if (options.MetadataQuerySchema is not null && HasSearchPathInConnectionString(connection.ConnectionString, options.MetadataQuerySchema) is false)
{
SetSearchPath(connection, options.MetadataQuerySchema);
Logger?.LogDebug("Using named data source '{name}' with schema '{schema}' for metadata queries.",
options.MetadataQueryConnectionName,
options.MetadataQuerySchema);
}
else
{
Logger?.LogDebug("Using named data source '{name}' for metadata queries.",
options.MetadataQueryConnectionName);
}
return;
}
// Fall back to ConnectionStrings
if (options.ConnectionStrings is null)
{
throw new ArgumentException("ConnectionStrings or DataSources must be provided when using named connections.");
}
if (!options.ConnectionStrings.TryGetValue(options.MetadataQueryConnectionName, out var connectionString))
{
throw new ArgumentException($"Connection '{options.MetadataQueryConnectionName}' not found in DataSources or ConnectionStrings.");
}
if (options.MetadataQuerySchema is not null)
{
if (HasSearchPathInConnectionString(connectionString, options.MetadataQuerySchema) is false)
{
var connectionStringBuilder = new NpgsqlConnectionStringBuilder(connectionString)
{
SearchPath = options.MetadataQuerySchema
};
connection = new NpgsqlConnection(connectionStringBuilder.ConnectionString);
}
else
{
connection = new NpgsqlConnection(connectionString);
}
shouldDispose = true;
Logger?.LogDebug("Using named connection string '{name}' with schema '{schema}' for metadata queries.",
options.MetadataQueryConnectionName,
options.MetadataQuerySchema);
}
else
{
connection = new NpgsqlConnection(connectionString);
shouldDispose = true;
Logger?.LogDebug("Using named connection string '{name}' for metadata queries.",
options.MetadataQueryConnectionName);
}
connection.OpenRetry(Options.ConnectionRetryOptions);
return;
}
// Try service provider
if (options.ServiceProviderMode != ServiceProviderObject.None)
{
if (serviceProvider is null)
{
throw new ArgumentException($"ServiceProvider must be provided when ServiceProviderMode is set to {options.ServiceProviderMode}.");
}
if (options.ServiceProviderMode == ServiceProviderObject.NpgsqlDataSource)
{
var dataSource = serviceProvider.GetRequiredService<NpgsqlDataSource>();
connection = dataSource.OpenConnection();
shouldDispose = true;
if (options.MetadataQuerySchema is not null && HasSearchPathInConnectionString(connection.ConnectionString, options.MetadataQuerySchema) is false)
{
SetSearchPath(connection, options.MetadataQuerySchema);
Logger?.LogDebug("Using NpgsqlDataSource from service provider with schema '{schema}' for metadata queries.",
options.MetadataQuerySchema);
}
else
{
Logger?.LogDebug("Using NpgsqlDataSource from service provider for metadata queries.");
}
}
else if (options.ServiceProviderMode == ServiceProviderObject.NpgsqlConnection)
{
shouldDispose = false;
connection = serviceProvider.GetRequiredService<NpgsqlConnection>();
if (connection.State != System.Data.ConnectionState.Open)
{
connection.OpenRetry(Options.ConnectionRetryOptions);
}
if (options.MetadataQuerySchema is not null && HasSearchPathInConnectionString(connection.ConnectionString, options.MetadataQuerySchema) is false)
{
SetSearchPath(connection, options.MetadataQuerySchema);
Logger?.LogDebug("Using NpgsqlConnection from service provider with schema '{schema}' for metadata queries.",
options.MetadataQuerySchema);
}
else
{
Logger?.LogDebug("Using NpgsqlConnection from service provider for metadata queries.");
}
}
return;
}
// Try DataSource
if (options.DataSource is not null)
{
connection = options.DataSource.CreateConnection();
shouldDispose = true;
connection.OpenRetry(Options.ConnectionRetryOptions);
if (options.MetadataQuerySchema is not null && HasSearchPathInConnectionString(connection.ConnectionString, options.MetadataQuerySchema) is false)
{
SetSearchPath(connection, options.MetadataQuerySchema);
Logger?.LogDebug("Using DataSource with schema '{schema}' for metadata queries.",
options.MetadataQuerySchema);
}
else
{
Logger?.LogDebug("Using DataSource for metadata queries.");
}
return;
}
// Fall back to connection string
if (string.IsNullOrEmpty(options.ConnectionString))
{
throw new ArgumentException("ConnectionString must be provided when no other connection source is configured.");
}
if (options.MetadataQuerySchema is not null)
{
if (HasSearchPathInConnectionString(options.ConnectionString, options.MetadataQuerySchema) is false)
{
var connectionStringBuilder = new NpgsqlConnectionStringBuilder(options.ConnectionString)
{
SearchPath = options.MetadataQuerySchema
};
connection = new NpgsqlConnection(connectionStringBuilder.ConnectionString);
}
else
{
connection = new NpgsqlConnection(options.ConnectionString);
}
shouldDispose = true;
connection.OpenRetry(Options.ConnectionRetryOptions);
Logger?.LogDebug("Using default connection string with schema '{schema}' for metadata queries.",
options.MetadataQuerySchema);
}
else
{
connection = new NpgsqlConnection(options.ConnectionString);
shouldDispose = true;
connection.OpenRetry(Options.ConnectionRetryOptions);
Logger?.LogDebug("Using default connection string for metadata queries.");
}
}
public static void AddParameter(this NpgsqlCommand command, object? value, bool isArray = false)
{
if (value is null)
{
value = DBNull.Value;
}
else if (isArray && value is string[] array)
{
if (array.Length == 0)
{
value = DBNull.Value;
}
}
else if (!isArray && value is string str)
{
if (string.IsNullOrWhiteSpace(str))
{
value = DBNull.Value;
}
}
command.Parameters.Add(new NpgsqlParameter
{
NpgsqlDbType = isArray ? NpgsqlDbType.Text | NpgsqlDbType.Array : NpgsqlDbType.Text,
Value = value
});
}
private static bool HasSearchPathInConnectionString(string connectionString, string schema)
{
// Fast string search for "Search Path=schema" pattern
// This avoids expensive NpgsqlConnectionStringBuilder parsing
int index = connectionString.IndexOf("Search Path", StringComparison.OrdinalIgnoreCase);
if (index == -1)
{
return false;
}
// Find the value after the key
int equalsIndex = connectionString.IndexOf('=', index);
if (equalsIndex == -1)
{
return false;
}
// Skip whitespace after '='
int valueStart = equalsIndex + 1;
while (valueStart < connectionString.Length && char.IsWhiteSpace(connectionString[valueStart]))
{
valueStart++;
}
// Find end of value (semicolon or end of string)
int valueEnd = connectionString.IndexOf(';', valueStart);
if (valueEnd == -1)
{
valueEnd = connectionString.Length;
}
// Extract and trim the value
int valueLength = valueEnd - valueStart;
if (valueLength == 0)
{
return false;
}
var value = connectionString.AsSpan(valueStart, valueLength).Trim();
return value.Equals(schema.AsSpan(), StringComparison.OrdinalIgnoreCase);
}
private static void SetSearchPath(NpgsqlConnection connection, string schema)
{
using var command = connection.CreateCommand();
command.CommandText = $"SET search_path TO \"{schema.Replace("\"", "\"\"")}\"";
command.ExecuteNonQuery();
}
public static T Get<T>(this NpgsqlDataReader reader, int ordinal)
{
object? value;
if (typeof(T) == typeof(short?[]))
{
value = reader.GetFieldValue<short?[]>(ordinal);
}
else
{
value = reader[ordinal];
}
if (value == DBNull.Value)
{
return default!;
}
// strange bug single char representing as string on older pg versions when using functions
if (typeof(T) == typeof(char) && value.GetType() == typeof(string))
{
if (value is null)
{
return default!;
}
object c = ((string)value)[0];
return (T)c;
}
return (T)value;
}
public static T GetEnum<T>(this string? value) where T : struct
{
Enum.TryParse<T>(value, true, out var result);
// return the first enum (Other) when no match
return result;
}
public static bool IsTypeOf(this Claim claim, string type)
{
return string.Equals(claim.Type, type, StringComparison.OrdinalIgnoreCase);
}
public static object GetClaimDbParam(this Dictionary<string, object> dict, string key)
{
if (dict.TryGetValue(key, out var value))
{
if (value is null)
{
return DBNull.Value;
}
return value;
}
return DBNull.Value;
}
public static object GetClaimDbContextParam(this Dictionary<string, object> dict, string key)
{
object value = dict.GetClaimDbParam(key);
if (value == DBNull.Value || value is string)
{
return value;
}
var list = value as List<string>;
StringBuilder sb = new(100);
sb.Append('{');
for (int i = 0; i < list?.Count; i++)
{
if (i > 0)
{
sb.Append(',');
}
sb.Append(PgConverters.SerializeString(list[i]));
}
sb.Append('}');
return sb.ToString();
}
public static Dictionary<string, object?> BuildClaimsDictionary(this ClaimsPrincipal? user, NpgsqlRestAuthenticationOptions options)
{
Dictionary<string, object?> claimValues = [];
if (user is null)
{
return claimValues;
}
foreach (var claim in user.Claims)
{
if (claimValues.TryGetValue(claim.Type, out var existing))
{
if (string.IsNullOrEmpty(claim.Value) is false)
{
if (existing is List<string> list)
{
list.Add(claim.Value);
}
else if (existing is not null)
{
var newList = new List<string>(4) { (string)existing, claim.Value };
claimValues[claim.Type] = newList;
}
}
}
else
{
if (claim.IsTypeOf(options.DefaultRoleClaimType))
{
if (string.IsNullOrEmpty(claim.Value) is false)
{
claimValues[claim.Type] = new List<string>(4) { claim.Value };
}
}
else
{
if (string.IsNullOrEmpty(claim.Value))
{
claimValues[claim.Type] = null;
}
else
{
claimValues[claim.Type] = claim.Value;
}
}
}
}
return claimValues;
}
public static object GetUserClaimsDbParam(this ClaimsPrincipal user, Dictionary<string, object?> claimValues)
{
if (claimValues.Count == 0)
{
return "{}";
}
int estimatedCapacity = 2 + (claimValues.Count * 10);
foreach (var entry in claimValues)
{
estimatedCapacity += entry.Key.Length * 2;
if (entry.Value is List<string> list)
{
estimatedCapacity += 2;
foreach (var value in list)
{
estimatedCapacity += value.Length * 2 + 3;
}
}
else
{
estimatedCapacity += entry.Value is null ? 4 : ((string)entry.Value).Length * 2 + 2;
}
}
StringBuilder sb = new(estimatedCapacity);
sb.Append('{');
int i = 0;
foreach (var entry in claimValues)
{
if (i > 0)
{
sb.Append(',');
}
sb.Append(PgConverters.SerializeString(entry.Key));
sb.Append(':');
if (entry.Value is List<string> values)
{
sb.Append('[');
for (int j = 0; j < values.Count; j++)
{
if (j > 0)
{
sb.Append(',');
}
sb.Append(PgConverters.SerializeString(values[j]));
}
sb.Append(']');
}
else
{
sb.Append(entry.Value is not null ? PgConverters.SerializeString((string)entry.Value) : "null");
}
i++;
}
sb.Append('}');
return sb.ToString();
}
public static string? GetClientIpAddress(this HttpRequest request)
{
// Check X-Forwarded-For header
var forwardedIp = request.Headers["X-Forwarded-For"].FirstOrDefault();
if (!string.IsNullOrEmpty(forwardedIp))
{
int commaIndex = forwardedIp.IndexOf(',');
return commaIndex > 0 ? forwardedIp[..commaIndex].Trim() : forwardedIp.Trim();
}
// Check other headers with null-coalescing operator
var ip = request.Headers["X-Real-IP"].FirstOrDefault()
?? request.Headers["HTTP_X_FORWARDED_FOR"].FirstOrDefault()
?? request.Headers["REMOTE_ADDR"].FirstOrDefault();
return !string.IsNullOrEmpty(ip) ? ip : request.HttpContext.Connection.RemoteIpAddress?.ToString();
}
public static object GetClientIpAddressDbParam(this HttpRequest request)
{
return request.GetClientIpAddress() as object ?? DBNull.Value;
}
private const string Info = nameof(PostgresNoticeLevels.INFO);
private const string Notice = nameof(PostgresNoticeLevels.NOTICE);
private const string Warning = nameof(PostgresNoticeLevels.WARNING);
public static bool IsInfo(this PostgresNotice notice)
{
return string.Equals(notice.Severity, Info, StringComparison.OrdinalIgnoreCase);
}
public static bool IsNotice(this PostgresNotice notice)
{
return string.Equals(notice.Severity, Notice, StringComparison.OrdinalIgnoreCase);
}
public static bool IsWarning(this PostgresNotice notice)
{
return string.Equals(notice.Severity, Warning, StringComparison.OrdinalIgnoreCase);
}
public static bool? ParameterEnabled(this Dictionary<string, string>? parameters, string key)
{
if (parameters is null || parameters.Count == 0)
{
return null;
}
if (parameters.TryGetValue(key, out var value))
{
// Check for "off" values
if (string.Equals(value, "false", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "off", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "disabled", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "disable", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "0", StringComparison.OrdinalIgnoreCase))
{
return false;
}
// Check for "on" values
if (string.Equals(value, "true", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "on", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "enabled", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "enable", StringComparison.OrdinalIgnoreCase) ||
string.Equals(value, "1", StringComparison.OrdinalIgnoreCase))
{
return true;
}
return null;
}
return null;
}
public static void TraceCommand(this NpgsqlCommand command, string name)
{
if (Logger?.IsEnabled(LogLevel.Trace) is true && Logger is not null)
{
StringBuilder sb = new();
for (int i = 0; i < command.Parameters.Count; i++)
{
sb.Append('$');
sb.Append(i+1);
sb.Append("=");
sb.Append(PgConverters.SerializeDatbaseObject(command.Parameters[i].Value));
sb.Append('\n');
}
sb.Append(command.CommandText);
Logger?.LogTrace("{name}:\n{query}", name, sb.ToString());
}
}
public static bool IsSsl(this HttpRequest request)
{
if (request.IsHttps)
{
return true;
}
if (string.Equals(request.Scheme, "https", StringComparison.OrdinalIgnoreCase))
{
return true;
}
return false;
}
public static bool TryGetErrorCodeMapping(this string policyName, string sqlState, out ErrorCodeMappingOptions mappingOptions)
{
mappingOptions = default!;
if (Options==null! || Options.ErrorHandlingOptions==null!)
{
return false;
}
if (!Options.ErrorHandlingOptions.ErrorCodePolicies.TryGetValue(policyName, out var policyMappings))
{
return false;
}
if (policyMappings.TryGetValue(sqlState, out var mapping))
{
mappingOptions = mapping;
return true;
}
return false;
}
}
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