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using System.Text.Json.Nodes;
using System.Text;
using System.Net.Http.Headers;
using Npgsql;
using System.Net;
using NpgsqlRest;
using Microsoft.AspNetCore.Http.HttpResults;
using System.Security.Claims;
using Serilog.Events;
using static System.Net.Mime.MediaTypeNames;
using static NpgsqlRestClient.Config;
using static NpgsqlRestClient.Builder;
using static NpgsqlRest.Auth.ClaimsDictionary;
namespace NpgsqlRestClient;
public class ExternalAuthClientConfig
{
public string ClientId { get; init; } = default!;
public string ClientSecret { get; init; } = default!;
public string AuthUrl { get; init; } = default!;
public string TokenUrl { get; init; } = default!;
public string InfoUrl { get; init; } = default!;
public string? EmailUrl { get; init; }
public string SigninUrl { get; init; } = default!;
public string ExternalType { get; init; } = default!;
}
public static class ExternalAuthConfig
{
public static string BrowserSessionStatusKey { get; private set; } = default!;
public static string BrowserSessionMessageKey { get; private set; } = default!;
public static string SignInHtmlTemplate { get; private set; } = default!;
public static string? RedirectUrl { get; private set; } = null;
public static string ReturnToPath { get; private set; } = default!;
public static string ReturnToPathQueryStringKey { get; private set; } = default!;
public static string LoginCommand { get; private set; } = default!;
public static Dictionary<string, ExternalAuthClientConfig> ClientConfigs { get; private set; } = new();
public static void Build(IConfigurationSection authConfig)
{
var externalCfg = authConfig.GetSection("External");
if (externalCfg.Exists() is false || GetConfigBool("Enabled", externalCfg) is false)
{
return;
}
foreach (var section in externalCfg.GetChildren())
{
if (section.GetChildren().Any() is false)
{
continue;
}
var signinUrlTemplate = GetConfigStr("SigninUrl", externalCfg) ?? "/signin-{0}";
if (GetConfigBool("Enabled", section) is false)
{
continue;
}
var signinUrl = string.Format(signinUrlTemplate, section.Key.ToLowerInvariant());
ClientConfigs.Add(signinUrl, new()
{
ClientId = GetConfigStr("ClientId", section) ?? throw new ArgumentException($"ClientId can not be null. Auth config section: {section.Key}"),
ClientSecret = GetConfigStr("ClientSecret", section) ?? throw new ArgumentException($"ClientSecret can not be null. Auth config section: {section.Key}"),
AuthUrl = GetConfigStr("AuthUrl", section) ?? throw new ArgumentException($"AuthUrl can not be null. Auth config section: {section.Key}"),
TokenUrl = GetConfigStr("TokenUrl", section) ?? throw new ArgumentException($"TokenUrl can not be null. Auth config section: {section.Key}"),
InfoUrl = GetConfigStr("InfoUrl", section) ?? throw new ArgumentException($"InfoUrl can not be null. Auth config section: {section.Key}"),
EmailUrl = GetConfigStr("EmailUrl", section),
SigninUrl = signinUrl,
ExternalType = section.Key
});
Logger?.Information("External login available for {0} available on path: {1}", section.Key, signinUrl);
}
if (ClientConfigs.Count == 0)
{
return;
}
BrowserSessionStatusKey = GetConfigStr("BrowserSessionStatusKey", externalCfg) ?? "__external_status";
BrowserSessionMessageKey = GetConfigStr("BrowserSessionMessageKey", externalCfg) ?? "__external_message";
SignInHtmlTemplate = GetConfigStr("SignInHtmlTemplate", externalCfg) ?? "<!DOCTYPE html><html><head><meta charset=\"utf-8\" /><title>Talking To {0}</title></head><body>Loading...{1}</body></html>";
RedirectUrl = GetConfigStr("RedirectUrl", externalCfg);
ReturnToPath = GetConfigStr("ReturnToPath", externalCfg) ?? "/";
ReturnToPathQueryStringKey = GetConfigStr("ReturnToPathQueryStringKey", externalCfg) ?? "return_to";
LoginCommand = GetConfigStr("LoginCommand", externalCfg) ?? "select * from auth.login($1, $2)";
}
}
public static class ExternalAuth
{
public static void Configure(WebApplication app, NpgsqlRestOptions options)
{
if (ExternalAuthConfig.ClientConfigs.Count == 0)
{
return;
}
app.Use(async (context, next) =>
{
if (ExternalAuthConfig.ClientConfigs.TryGetValue(context.Request.Path, out var config) is false)
{
await next(context);
return;
}
if (string.Equals(context.Request.Method, "GET", StringComparison.OrdinalIgnoreCase))
{
PrepareResponse(Text.Html);
await context.Response.WriteAsync(BuildHtmlTemplate(config, context.Request));
await context.Response.CompleteAsync();
return;
}
if (string.Equals(context.Request.Method, "POST", StringComparison.OrdinalIgnoreCase))
{
PrepareResponse(Text.Plain);
using var reader = new StreamReader(context.Request.Body, Encoding.UTF8);
try
{
var body = await reader.ReadToEndAsync();
JsonNode node = JsonNode.Parse(body) ??
throw new ArgumentException("json node is null");
string code = (node["code"]?.ToString()) ??
throw new ArgumentException("code retrieved from the external provider is null");
await ProcessAsync(code, config, context, options);
return;
}
catch (Exception e)
{
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
await context.Response.WriteAsync(string.Format("Error talking to {0}", config.ExternalType));
await context.Response.CompleteAsync();
Logger?.Error(e, "Failed to parse external provider response: {0}", config.ExternalType);
return;
}
}
await next(context);
void PrepareResponse(string contentType)
{
context.Response.ContentType = contentType;
context.Response.StatusCode = (int)HttpStatusCode.OK;
context.Response.Headers.CacheControl = "no-store, no-cache, must-revalidate, proxy-revalidate";
context.Response.Headers.Pragma = "no-cache";
context.Response.Headers.Expires = "0";
}
});
}
private static readonly HttpClient _httpClient = new();
private static readonly string _agent = $"{Guid.NewGuid().ToString()[..8]}";
private const string browserSessionStateKey = "__external_state";
private const string browserSessionParamsKey = "__external_params";
private static async Task ProcessAsync(string code, ExternalAuthClientConfig config, HttpContext context, NpgsqlRestOptions options)
{
string? email;
string? name;
string token;
using var requestTokenMessage = new HttpRequestMessage(HttpMethod.Post, config.TokenUrl);
requestTokenMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(Application.Json));
requestTokenMessage.Content = new FormUrlEncodedContent(new Dictionary<string, string>
{
["redirect_uri"] = GetRedirectUrl(config, context.Request),
["code"] = code,
["client_id"] = config.ClientId,
["client_secret"] = config.ClientSecret,
["grant_type"] = "authorization_code"
});
using var tokenResponse = await _httpClient.SendAsync(requestTokenMessage);
var tokenContent = await tokenResponse.Content.ReadAsStringAsync();
if (!tokenResponse.IsSuccessStatusCode)
{
throw new HttpRequestException($"Token endpoint {config.TokenUrl} returned {tokenResponse.StatusCode} with following content: {tokenContent}");
}
if (string.IsNullOrEmpty(tokenContent))
{
throw new HttpRequestException($"Token endpoint {config.TokenUrl} returned {tokenResponse.StatusCode} with empty content.");
}
try
{
JsonNode node = JsonNode.Parse(tokenContent) ??
throw new ArgumentException("token json node is null");
token = (node["access_token"]?.ToString()) ??
throw new ArgumentException("access_token retrieved from the external provider is null");
}
catch (Exception e)
{
throw new ArgumentException(string.Format("Failed to parse the token response: {0}", e.Message), e);
}
using var infoRequest = new HttpRequestMessage(HttpMethod.Get, config.InfoUrl);
infoRequest.Headers.UserAgent.ParseAdd(_agent);
infoRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
using var infoResponse = await _httpClient.SendAsync(infoRequest);
var infoContent = await infoResponse.Content.ReadAsStringAsync();
if (!infoResponse.IsSuccessStatusCode)
{
throw new HttpRequestException($"Info endpoint {config.InfoUrl} returned {infoResponse.StatusCode} with following content: {infoContent}");
}
if (string.IsNullOrEmpty(infoContent))
{
throw new HttpRequestException($"Info endpoint {config.InfoUrl} returned {infoResponse.StatusCode} with empty content.");
}
try
{
JsonNode node = JsonNode.Parse(infoContent) ??
throw new ArgumentException("info json node is null");
email = node["email"]?.ToString() ??
node?["elements"]?[0]?["handle~"]?["emailAddress"]?.ToString(); // linkedin format
#pragma warning disable CS8602 // Dereference of a possibly null reference.
name = node["localizedLastName"] is not null ?
$"{node["localizedFirstName"]} {node["localizedLastName"]}".Trim() : // linkedin format
node["name"]?.ToString(); // normal format
#pragma warning restore CS8602 // Dereference of a possibly null reference.
}
catch (Exception e)
{
throw new ArgumentException(string.Format("Failed to parse the info response: {0}", e.Message), e);
}
if (email is null && config.EmailUrl is not null)
{
using var emailRequest = new HttpRequestMessage(HttpMethod.Get, config.EmailUrl);
infoRequest.Headers.UserAgent.ParseAdd(_agent);
infoRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
using var emailResponse = await _httpClient.SendAsync(emailRequest);
var emailContent = await emailResponse.Content.ReadAsStringAsync();
if (!emailResponse.IsSuccessStatusCode)
{
throw new HttpRequestException($"Email endpoint {config.EmailUrl} returned {emailResponse.StatusCode} with following content: {emailResponse}");
}
if (string.IsNullOrEmpty(emailContent))
{
throw new HttpRequestException($"Email endpoint {config.EmailUrl} returned {emailResponse.StatusCode} with empty content.");
}
try
{
JsonNode node = JsonNode.Parse(emailContent) ??
throw new ArgumentException("email json node is null");
email = node["email"]?.ToString() ??
node?["elements"]?[0]?["handle~"]?["emailAddress"]?.ToString(); // linkedin format
}
catch (Exception e)
{
throw new ArgumentException(string.Format("Failed to parse the email response: {0}", e.Message), e);
}
}
if (email is null)
{
throw new ArgumentException("email retrieved from the external provider is null");
}
using var connection = new NpgsqlConnection(options.ConnectionString);
await connection.OpenAsync();
using var command = connection.CreateCommand();
command.CommandText = ExternalAuthConfig.LoginCommand;
command.Parameters.Add(new NpgsqlParameter()
{
Value = email,
});
command.Parameters.Add(new NpgsqlParameter()
{
Value = name is not null ? name : DBNull.Value
});
await using NpgsqlDataReader reader = await command.ExecuteReaderAsync();
if (await reader.ReadAsync() is false || reader.FieldCount == 0)
{
await CompleteWithErrorAsync("Login command did not return any data.", HttpStatusCode.NotFound, LogEventLevel.Warning);
return;
}
var authenticationType = options.AuthenticationOptions.DefaultAuthenticationType;
string? scheme = null;
string? message = null;
var claims = new List<Claim>(10);
context.Response.StatusCode = (int)HttpStatusCode.OK;
for (int i = 0; i < reader?.FieldCount; i++)
{
string name1 = reader.GetName(i);
string name2 = options.NameConverter(name1) ?? name1;
var descriptor = new TypeDescriptor(reader.GetDataTypeName(i));
if (options.AuthenticationOptions.StatusColumnName is not null)
{
if (string.Equals(name1, options.AuthenticationOptions.StatusColumnName, StringComparison.OrdinalIgnoreCase) ||
string.Equals(name2, options.AuthenticationOptions.StatusColumnName, StringComparison.OrdinalIgnoreCase))
{
if (descriptor.IsBoolean)
{
var ok = reader?.GetBoolean(i);
if (ok is false)
{
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
}
}
else if (descriptor.IsNumeric)
{
var status = reader?.GetInt32(i) ?? 200;
if (status != (int)HttpStatusCode.OK)
{
context.Response.StatusCode = status;
}
}
else
{
await CompleteWithErrorAsync("External login command returns a status field that is not either boolean or numeric.",
HttpStatusCode.InternalServerError, LogEventLevel.Error);
return;
}
continue;
}
}
if (options.AuthenticationOptions.SchemeColumnName is not null)
{
if (string.Equals(name1, options.AuthenticationOptions.SchemeColumnName, StringComparison.OrdinalIgnoreCase) ||
string.Equals(name2, options.AuthenticationOptions.SchemeColumnName, StringComparison.OrdinalIgnoreCase))
{
scheme = reader?.GetValue(i).ToString();
continue;
}
}
if (options.AuthenticationOptions.MessageColumnName is not null)
{
if (string.Equals(name1, options.AuthenticationOptions.MessageColumnName, StringComparison.OrdinalIgnoreCase) ||
string.Equals(name2, options.AuthenticationOptions.MessageColumnName, StringComparison.OrdinalIgnoreCase))
{
message = reader?.GetValue(i).ToString();
continue;
}
}
string? claimType;
if (options.AuthenticationOptions.UseActiveDirectoryFederationServicesClaimTypes)
{
if (ClaimTypesDictionary.TryGetValue(name1.ToLowerInvariant(), out claimType) is false)
{
if (ClaimTypesDictionary.TryGetValue(name2.ToLowerInvariant(), out claimType) is false)
{
claimType = name2;
}
}
}
else
{
claimType = name2;
}
if (reader?.IsDBNull(i) is true)
{
claims.Add(new Claim(claimType, ""));
}
else if (descriptor.IsArray)
{
object[]? values = reader?.GetValue(i) as object[];
for (int j = 0; j < values?.Length; j++)
{
claims.Add(new Claim(claimType, values[j]?.ToString() ?? ""));
}
}
else
{
string? value = reader?.GetValue(i)?.ToString();
claims.Add(new Claim(claimType, value ?? ""));
}
}
if (context.Response.StatusCode == (int)HttpStatusCode.OK)
{
var principal = new ClaimsPrincipal(new ClaimsIdentity(
claims, scheme ?? authenticationType,
nameType: options.AuthenticationOptions.DefaultNameClaimType,
roleType: options.AuthenticationOptions.DefaultRoleClaimType));
if (Results.SignIn(principal: principal, authenticationScheme: scheme) is not SignInHttpResult result)
{
await CompleteWithErrorAsync("Failed in constructing user identity for authentication.",
HttpStatusCode.InternalServerError, LogEventLevel.Error);
return;
}
await result.ExecuteAsync(context);
}
if (message is not null)
{
await context.Response.WriteAsync(message);
}
await context.Response.CompleteAsync();
async Task CompleteWithErrorAsync(string text, HttpStatusCode code, LogEventLevel? logLevel = null)
{
if (logLevel.HasValue)
{
Logger?.Write(logLevel.Value, text);
}
context.Response.StatusCode = (int)code;
await context.Response.WriteAsync(text);
await context.Response.CompleteAsync();
}
}
private static string BuildHtmlTemplate(ExternalAuthClientConfig config, HttpRequest request)
{
string redirectUrl = GetRedirectUrl(config, request);
var state = Guid.NewGuid().ToString();
var redirectTo = "/";
var authUrl = string.Format(config.AuthUrl, config.ClientId, redirectUrl, state);
return string.Format(ExternalAuthConfig.SignInHtmlTemplate,
config.ExternalType,
string.Format(_jsTemplate,
browserSessionStateKey,//0
state,//1
browserSessionParamsKey,//2
ExternalAuthConfig.BrowserSessionStatusKey,//3
ExternalAuthConfig.BrowserSessionMessageKey,//4
redirectTo,//5
authUrl,//6
config.SigninUrl,//7
ExternalAuthConfig.ReturnToPathQueryStringKey,//8
config.ExternalType//9
));
}
private static string GetRedirectUrl(ExternalAuthClientConfig clientConfig, HttpRequest request)
{
return ExternalAuthConfig.RedirectUrl is null ?
string.Concat(request.Scheme, "://", request.Host, clientConfig.SigninUrl) :
string.Concat(ExternalAuthConfig.RedirectUrl, clientConfig.SigninUrl);
}
private const string _jsTemplate =
"""
<script>
(async function () {{
function paramsToObject(search) {{
const hashes = search.slice(search.indexOf('?') + 1).split('&');
const params = {{}};
hashes.map(hash => {{
const [key, val] = hash.split('=');
if (key && val) {{
params[key] = decodeURIComponent(val);
}}
}});
return params;
}}
var stateKey = "{0}";
var stateValue = "{1}";
var paramsKey = "{2}";
var statusKey = "{3}";
var messageKey = "{4}";
var returnToKey = "_return_to";
var redirectTo = "{5}";
var authUrl = "{6}";
var signinUrl = "{7}";
var returnToPathQueryStringKey = "{8}";
var externalType = "{9}";
var params = paramsToObject(window.location.search);
var keys = Object.keys(params);
if (keys.length==0 || (keys.length==1 && params[returnToPathQueryStringKey])) {{
if (params[returnToPathQueryStringKey]) {{
sessionStorage.setItem(returnToKey, params[returnToPathQueryStringKey]);
delete params[returnToPathQueryStringKey];
}} else {{
sessionStorage.removeItem(returnToKey);
}}
sessionStorage.setItem(stateKey, stateValue);
sessionStorage.setItem(paramsKey, JSON.stringify(params));
document.location = authUrl;
return;
}} else {{
var state = sessionStorage.getItem(stateKey);
params = Object.assign(params, JSON.parse(sessionStorage.getItem(paramsKey) == null ? {{}} : sessionStorage.getItem(paramsKey)));
sessionStorage.removeItem(stateKey);
var returnTo = sessionStorage.getItem(returnToKey) || redirectTo;
if (!params.error && params.state !== state) {{
params.error = "Invalid state code received from external provider " + externalType + ".";
}}
if (params.error) {{
sessionStorage.setItem(statusKey, 503);
sessionStorage.setItem(messageKey, params.error);
document.location = returnTo;
return;
}}
var response = await fetch(signinUrl, {{
method: "POST",
headers: {{"Accept": "application/json","Content-Type": "application/json"}},
body: JSON.stringify(params)
}});
sessionStorage.setItem(statusKey, response.status);
sessionStorage.setItem(messageKey, await response.text());
document.location = returnTo;
}}
}})();
</script>
""";
}
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