317 lines
12 KiB
C#
317 lines
12 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Text;
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using FluentResults;
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using Npgsql;
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namespace pgLabII.PgUtils.ConnectionStrings;
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public sealed class NpgsqlCodec : IConnectionStringCodec
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{
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public ConnStringFormat Format => ConnStringFormat.Npgsql;
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public string FormatName => "Npgsql";
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public Result<ConnectionDescriptor> TryParse(string input)
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{
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try
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{
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var dict = Tokenize(input);
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var descriptor = new ConnectionDescriptorBuilder();
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// Hosts and Ports
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if (dict.TryGetValue("Host", out var hostVal) || dict.TryGetValue("Server", out hostVal) || dict.TryGetValue("Servers", out hostVal))
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{
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var hosts = SplitList(hostVal).ToList();
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List<ushort?> portsPerHost = new();
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if (dict.TryGetValue("Port", out var portVal))
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{
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var ports = SplitList(portVal).ToList();
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if (ports.Count == 1 && ushort.TryParse(ports[0], out var singlePort))
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{
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foreach (var _ in hosts) portsPerHost.Add(singlePort);
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}
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else if (ports.Count == hosts.Count)
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{
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foreach (var p in ports)
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{
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if (ushort.TryParse(p, NumberStyles.Integer, CultureInfo.InvariantCulture, out var up))
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portsPerHost.Add(up);
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else
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portsPerHost.Add(null);
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}
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}
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}
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for (int i = 0; i < hosts.Count; i++)
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{
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ushort? port = i < portsPerHost.Count ? portsPerHost[i] : null;
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descriptor.AddHost(hosts[i], port);
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}
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}
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// Standard fields
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if (TryGetFirst(dict, out var db, "Database", "Db", "Initial Catalog", "dbname"))
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descriptor.Database = db;
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if (TryGetFirst(dict, out var user, "Username", "User ID", "User", "UID"))
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descriptor.Username = user;
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if (TryGetFirst(dict, out var pass, "Password", "PWD"))
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descriptor.Password = pass;
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if (TryGetFirst(dict, out var app, "Application Name", "ApplicationName"))
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descriptor.ApplicationName = app;
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if (TryGetFirst(dict, out var timeout, "Timeout", "Connect Timeout", "Connection Timeout"))
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{
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if (int.TryParse(timeout, NumberStyles.Integer, CultureInfo.InvariantCulture, out var t))
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descriptor.TimeoutSeconds = t;
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}
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if (TryGetFirst(dict, out var ssl, "SSL Mode", "SslMode", "SSLMode"))
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descriptor.SslMode = ParseSslMode(ssl);
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// Preserve extras (not mapped) into Properties
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var mapped = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
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{
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"Host","Server","Servers","Port","Database","Db","Initial Catalog","dbname",
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"Username","User ID","User","UID","Password","PWD","Application Name","ApplicationName",
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"Timeout","Connect Timeout","Connection Timeout","SSL Mode","SslMode","SSLMode"
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};
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foreach (var (k, v) in dict)
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{
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if (!mapped.Contains(k))
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descriptor.Properties[k] = v;
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}
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return Result.Ok(descriptor.Build());
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}
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catch (Exception ex)
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{
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return Result.Fail<ConnectionDescriptor>(ex.Message);
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}
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}
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public Result<string> TryFormat(ConnectionDescriptor descriptor)
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{
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try
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{
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var parts = new List<string>();
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if (descriptor.Hosts != null && descriptor.Hosts.Count > 0)
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{
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var hostList = string.Join(',', descriptor.Hosts.Select(h => h.Host));
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parts.Add(FormatPair("Host", hostList));
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var ports = descriptor.Hosts.Select(h => h.Port).Where(p => p.HasValue).Select(p => p!.Value).Distinct().ToList();
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if (ports.Count == 1)
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{
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parts.Add(FormatPair("Port", ports[0].ToString(CultureInfo.InvariantCulture)));
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}
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else if (ports.Count == 0)
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{
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// nothing
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}
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else
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{
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// Per-host ports if provided 1:1
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var perHost = descriptor.Hosts.Select(h => h.Port?.ToString(CultureInfo.InvariantCulture) ?? string.Empty).ToList();
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if (perHost.All(s => !string.IsNullOrEmpty(s)))
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parts.Add(FormatPair("Port", string.Join(',', perHost)));
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}
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}
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if (!string.IsNullOrEmpty(descriptor.Database))
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parts.Add(FormatPair("Database", descriptor.Database));
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if (!string.IsNullOrEmpty(descriptor.Username))
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parts.Add(FormatPair("Username", descriptor.Username));
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if (!string.IsNullOrEmpty(descriptor.Password))
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parts.Add(FormatPair("Password", descriptor.Password));
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if (descriptor.SslMode.HasValue)
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parts.Add(FormatPair("SSL Mode", FormatSslMode(descriptor.SslMode.Value)));
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if (!string.IsNullOrEmpty(descriptor.ApplicationName))
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parts.Add(FormatPair("Application Name", descriptor.ApplicationName));
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if (descriptor.TimeoutSeconds.HasValue)
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parts.Add(FormatPair("Timeout", descriptor.TimeoutSeconds.Value.ToString(CultureInfo.InvariantCulture)));
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var emittedKeys = new HashSet<string>(parts.Select(p => p.Split('=')[0].Trim()), StringComparer.OrdinalIgnoreCase);
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foreach (var kv in descriptor.Properties)
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{
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if (!emittedKeys.Contains(kv.Key))
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parts.Add(FormatPair(kv.Key, kv.Value));
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}
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return Result.Ok(string.Join(";", parts));
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}
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catch (Exception ex)
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{
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return Result.Fail<string>(ex.Message);
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}
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}
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private static IEnumerable<string> SplitList(string s)
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{
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return s.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
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}
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private static bool TryGetFirst(Dictionary<string, string> dict, out string value, params string[] keys)
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{
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foreach (var k in keys)
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{
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if (dict.TryGetValue(k, out value)) return true;
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}
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value = string.Empty;
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return false;
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}
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private static SslMode ParseSslMode(string s)
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{
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switch (s.Trim().ToLowerInvariant())
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{
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case "disable": return SslMode.Disable;
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case "allow": return SslMode.Allow;
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case "prefer": return SslMode.Prefer;
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case "require": return SslMode.Require;
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case "verify-ca":
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case "verifyca": return SslMode.VerifyCA;
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case "verify-full":
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case "verifyfull": return SslMode.VerifyFull;
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default: throw new ArgumentException($"Not a valid SSL Mode: {s}");
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}
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}
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private static string FormatSslMode(SslMode mode)
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{
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return mode switch
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{
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SslMode.Disable => "Disable",
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SslMode.Allow => "Allow",
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SslMode.Prefer => "Prefer",
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SslMode.Require => "Require",
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SslMode.VerifyCA => "VerifyCA",
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SslMode.VerifyFull => "VerifyFull",
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_ => "Prefer"
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};
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}
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// Npgsql/.NET connection string grammar: semicolon-separated key=value; values with special chars are wrapped in quotes, internal quotes doubled
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private static string FormatPair(string key, string? value)
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{
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value ??= string.Empty;
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var needsQuotes = NeedsQuoting(value);
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if (!needsQuotes) return key + "=" + value;
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return key + "=\"" + EscapeQuoted(value) + "\"";
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}
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private static bool NeedsQuoting(string value)
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{
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if (value.Length == 0) return true;
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foreach (var c in value)
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{
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if (char.IsWhiteSpace(c) || c == ';' || c == '=' || c == '"') return true;
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}
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return false;
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}
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private static string EscapeQuoted(string value)
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{
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// Double the quotes per standard DbConnectionString rules
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return value.Replace("\"", "\"\"");
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}
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private static Dictionary<string, string> Tokenize(string input)
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{
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// Simple tokenizer for .NET connection strings: key=value pairs separated by semicolons; values may be quoted with double quotes
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var dict = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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int i = 0;
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void SkipWs() { while (i < input.Length && char.IsWhiteSpace(input[i])) i++; }
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while (true)
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{
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SkipWs();
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if (i >= input.Length) break;
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// read key
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int keyStart = i;
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while (i < input.Length && input[i] != '=') i++;
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if (i >= input.Length) { break; }
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var key = input.Substring(keyStart, i - keyStart).Trim();
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i++; // skip '='
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SkipWs();
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// read value
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string value;
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if (i < input.Length && input[i] == '"')
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{
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i++; // skip opening quote
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var sb = new StringBuilder();
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while (i < input.Length)
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{
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char c = input[i++];
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if (c == '"')
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{
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if (i < input.Length && input[i] == '"')
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{
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// doubled quote -> literal quote
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sb.Append('"');
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i++;
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continue;
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}
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else
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{
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break; // end quoted value
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}
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}
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else
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{
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sb.Append(c);
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}
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}
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value = sb.ToString();
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}
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else
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{
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int valStart = i;
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while (i < input.Length && input[i] != ';') i++;
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value = input.Substring(valStart, i - valStart).Trim();
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}
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dict[key] = value;
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// skip to next, if ; present, consume one
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while (i < input.Length && input[i] != ';') i++;
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if (i < input.Length && input[i] == ';') i++;
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}
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return dict;
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}
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private sealed class ConnectionDescriptorBuilder
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{
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public List<HostEndpoint> Hosts { get; } = new();
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public string? Database { get; set; }
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public string? Username { get; set; }
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public string? Password { get; set; }
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public SslMode? SslMode { get; set; }
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public string? ApplicationName { get; set; }
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public int? TimeoutSeconds { get; set; }
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public Dictionary<string, string> Properties { get; } = new(StringComparer.OrdinalIgnoreCase);
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public void AddHost(string host, ushort? port)
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{
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if (string.IsNullOrWhiteSpace(host)) return;
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Hosts.Add(new HostEndpoint { Host = host.Trim(), Port = port });
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}
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public ConnectionDescriptor Build()
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{
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return new ConnectionDescriptor
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{
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Hosts = Hosts,
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Database = Database,
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Username = Username,
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Password = Password,
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SslMode = SslMode,
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ApplicationName = ApplicationName,
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TimeoutSeconds = TimeoutSeconds,
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Properties = Properties
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};
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}
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}
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}
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