UriBuilder.cs

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using System.Diagnostics.CodeAnalysis;
using System.Text;
 
namespace System;
 
public class UriBuilder
{
    private string _scheme = "http";
 
    private string _username = string.Empty;
 
    private string _password = string.Empty;
 
    private string _host = "localhost";
 
    private int _port = -1;
 
    private string _path = "/";
 
    private string _query = string.Empty;
 
    private string _fragment = string.Empty;
 
    private bool _changed = true;
 
    private Uri _uri;
 
    public string Scheme
    {
        get
        {
            return _scheme;
        }
        [param: AllowNull]
        set
        {
            if (value == null)
            {
                value = string.Empty;
            }
            if (value.Length != 0)
            {
                if (!System.Uri.CheckSchemeName(value))
                {
                    int num = value.IndexOf(':');
                    if (num != -1)
                    {
                        value = value.Substring(0, num);
                    }
                    if (!System.Uri.CheckSchemeName(value))
                    {
                        throw new ArgumentException(System.SR.net_uri_BadScheme, "value");
                    }
                }
                value = value.ToLowerInvariant();
            }
            _scheme = value;
            _changed = true;
        }
    }
 
    public string UserName
    {
        get
        {
            return _username;
        }
        [param: AllowNull]
        set
        {
            _username = value ?? string.Empty;
            _changed = true;
        }
    }
 
    public string Password
    {
        get
        {
            return _password;
        }
        [param: AllowNull]
        set
        {
            _password = value ?? string.Empty;
            _changed = true;
        }
    }
 
    public string Host
    {
        get
        {
            return _host;
        }
        [param: AllowNull]
        set
        {
            if (!string.IsNullOrEmpty(value) && value.Contains(':') && value[0] != '[')
            {
                value = "[" + value + "]";
            }
            _host = value ?? string.Empty;
            _changed = true;
        }
    }
 
    public int Port
    {
        get
        {
            return _port;
        }
        set
        {
            if (value < -1 || value > 65535)
            {
                throw new ArgumentOutOfRangeException("value");
            }
            _port = value;
            _changed = true;
        }
    }
 
    public string Path
    {
        get
        {
            return _path;
        }
        [param: AllowNull]
        set
        {
            _path = (string.IsNullOrEmpty(value) ? "/" : System.Uri.InternalEscapeString(value.Replace('\\', '/')));
            _changed = true;
        }
    }
 
    public string Query
    {
        get
        {
            return _query;
        }
        [param: AllowNull]
        set
        {
            if (!string.IsNullOrEmpty(value) && value[0] != '?')
            {
                value = "?" + value;
            }
            _query = value ?? string.Empty;
            _changed = true;
        }
    }
 
    public string Fragment
    {
        get
        {
            return _fragment;
        }
        [param: AllowNull]
        set
        {
            if (!string.IsNullOrEmpty(value) && value[0] != '#')
            {
                value = "#" + value;
            }
            _fragment = value ?? string.Empty;
            _changed = true;
        }
    }
 
    public Uri Uri
    {
        get
        {
            if (_changed)
            {
                _uri = new Uri(ToString());
                SetFieldsFromUri();
                _changed = false;
            }
            return _uri;
        }
    }
 
    public UriBuilder()
    {
    }
 
    public UriBuilder(string uri)
    {
        _uri = new Uri(uri, UriKind.RelativeOrAbsolute);
        if (!_uri.IsAbsoluteUri)
        {
            _uri = new Uri(System.Uri.UriSchemeHttp + System.Uri.SchemeDelimiter + uri);
        }
        SetFieldsFromUri();
    }
 
    public UriBuilder(Uri uri)
    {
        _uri = uri ?? throw new ArgumentNullException("uri");
        SetFieldsFromUri();
    }
 
    public UriBuilder(string? schemeName, string? hostName)
    {
        Scheme = schemeName;
        Host = hostName;
    }
 
    public UriBuilder(string? scheme, string? host, int portNumber)
        : this(scheme, host)
    {
        Port = portNumber;
    }
 
    public UriBuilder(string? scheme, string? host, int port, string? pathValue)
        : this(scheme, host, port)
    {
        Path = pathValue;
    }
 
    public UriBuilder(string? scheme, string? host, int port, string? path, string? extraValue)
        : this(scheme, host, port, path)
    {
        if (string.IsNullOrEmpty(extraValue))
        {
            return;
        }
        if (extraValue[0] == '#')
        {
            _fragment = extraValue;
        }
        else
        {
            if (extraValue[0] != '?')
            {
                throw new ArgumentException(System.SR.Argument_ExtraNotValid, "extraValue");
            }
            int num = extraValue.IndexOf('#');
            if (num == -1)
            {
                _query = extraValue;
            }
            else
            {
                _query = extraValue.Substring(0, num);
                _fragment = extraValue.Substring(num);
            }
        }
        if (_query.Length == 1)
        {
            _query = string.Empty;
        }
        if (_fragment.Length == 1)
        {
            _fragment = string.Empty;
        }
    }
 
    public override bool Equals([NotNullWhen(true)] object? rparam)
    {
        if (rparam != null)
        {
            return Uri.Equals(rparam.ToString());
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return Uri.GetHashCode();
    }
 
    private void SetFieldsFromUri()
    {
        _scheme = _uri.Scheme;
        _host = _uri.Host;
        _port = _uri.Port;
        _path = _uri.AbsolutePath;
        _query = _uri.Query;
        _fragment = _uri.Fragment;
        string userInfo = _uri.UserInfo;
        if (userInfo.Length > 0)
        {
            int num = userInfo.IndexOf(':');
            if (num != -1)
            {
                _password = userInfo.Substring(num + 1);
                _username = userInfo.Substring(0, num);
            }
            else
            {
                _username = userInfo;
            }
        }
    }
 
    public override string ToString()
    {
        if (UserName.Length == 0 && Password.Length != 0)
        {
            throw new UriFormatException(System.SR.net_uri_BadUserPassword);
        }
        Span<char> initialBuffer = stackalloc char[512];
        System.Text.ValueStringBuilder valueStringBuilder = new System.Text.ValueStringBuilder(initialBuffer);
        string scheme = Scheme;
        string host = Host;
        if (scheme.Length != 0)
        {
            UriParser syntax = UriParser.GetSyntax(scheme);
            string s = ((syntax != null) ? ((syntax.InFact(UriSyntaxFlags.MustHaveAuthority) || (host.Length != 0 && syntax.NotAny(UriSyntaxFlags.MailToLikeUri) && syntax.InFact(UriSyntaxFlags.OptionalAuthority))) ? System.Uri.SchemeDelimiter : ":") : ((host.Length == 0) ? ":" : System.Uri.SchemeDelimiter));
            valueStringBuilder.Append(scheme);
            valueStringBuilder.Append(s);
        }
        string userName = UserName;
        if (userName.Length != 0)
        {
            valueStringBuilder.Append(userName);
            string password = Password;
            if (password.Length != 0)
            {
                valueStringBuilder.Append(':');
                valueStringBuilder.Append(password);
            }
            valueStringBuilder.Append('@');
        }
        if (host.Length != 0)
        {
            valueStringBuilder.Append(host);
            if (_port != -1)
            {
                valueStringBuilder.Append(':');
                int charsWritten;
                bool flag = _port.TryFormat(valueStringBuilder.AppendSpan(5), out charsWritten);
                valueStringBuilder.Length -= 5 - charsWritten;
            }
        }
        string path = Path;
        if (path.Length != 0)
        {
            if (!path.StartsWith('/') && host.Length != 0)
            {
                valueStringBuilder.Append('/');
            }
            valueStringBuilder.Append(path);
        }
        valueStringBuilder.Append(Query);
        valueStringBuilder.Append(Fragment);
        return valueStringBuilder.ToString();
    }
}