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using System.Net;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json.Nodes;
using Npgsql;
using NpgsqlRest;
using NpgsqlRest.Auth;
using static NpgsqlRest.NpgsqlRestOptions;
using static System.Net.Mime.MediaTypeNames;
namespace NpgsqlRestClient;
public class ExternalAuthClientConfig
{
public bool Enabled { get; set; } = false;
public string ClientId { get; set; } = default!;
public string ClientSecret { get; set; } = default!;
public string AuthUrl { get; set; } = default!;
public string TokenUrl { get; set; } = default!;
public string InfoUrl { get; set; } = default!;
public string? EmailUrl { get; set; } = null;
public string SigninUrl { get; set; } = default!;
public string ExternalType { get; set; } = default!;
}
public class ExternalAuthConfig
{
public bool Enabled { get; set; } = false;
public string BrowserSessionStatusKey { get; private set; } = default!;
public string BrowserSessionMessageKey { get; private set; } = default!;
public string SignInHtmlTemplate { get; private set; } = default!;
public string? RedirectUrl { get; private set; } = null;
public string ReturnToPath { get; private set; } = default!;
public string ReturnToPathQueryStringKey { get; private set; } = default!;
public string LoginCommand { get; private set; } = default!;
public string ClientAnalyticsData { get; private set; } = default!;
public string ClientAnalyticsIpKey { get; private set; } = default!;
private readonly Dictionary<string, ExternalAuthClientConfig> DefaultClientConfigs =
new()
{
{ "google", new ExternalAuthClientConfig
{
AuthUrl = "https://accounts.google.com/o/oauth2/v2/auth?response_type=code&client_id={0}&redirect_uri={1}&scope=openid profile email&state={2}",
TokenUrl = "https://oauth2.googleapis.com/token",
InfoUrl = "https://www.googleapis.com/oauth2/v3/userinfo",
}
},
{ "linkedin", new ExternalAuthClientConfig
{
AuthUrl = "https://www.linkedin.com/oauth/v2/authorization?response_type=code&client_id={0}&redirect_uri={1}&state={2}&scope=r_liteprofile%20r_emailaddress",
TokenUrl = "https://www.linkedin.com/oauth/v2/accessToken",
InfoUrl = "https://api.linkedin.com/v2/me",
EmailUrl = "https://api.linkedin.com/v2/emailAddress?q=members&projection=(elements//(handle~))"
}
},
{ "github", new ExternalAuthClientConfig
{
AuthUrl = "https://github.com/login/oauth/authorize?client_id={0}&redirect_uri={1}&state={2}&allow_signup=false",
TokenUrl = "https://github.com/login/oauth/access_token",
InfoUrl = "https://api.github.com/user",
}
},
{ "microsoft", new ExternalAuthClientConfig
{
AuthUrl = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize?response_type=code&client_id={0}&redirect_uri={1}&scope=openid%20profile%20email&state={2}",
TokenUrl = "https://login.microsoftonline.com/common/oauth2/v2.0/token",
InfoUrl = "https://graph.microsoft.com/oidc/userinfo",
}
},
{ "facebook", new ExternalAuthClientConfig
{
AuthUrl = "https://www.facebook.com/v20.0/dialog/oauth?response_type=code&client_id={0}&redirect_uri={1}&scope=public_profile%20email&state={2}",
TokenUrl = "https://graph.facebook.com/v20.0/oauth/access_token",
InfoUrl = "https://graph.facebook.com/me?fields=id,name,email",
}
}
};
public Dictionary<string, ExternalAuthClientConfig> ClientConfigs { get; private set; } = [];
public void Build(IConfigurationSection authConfig, Config config, Builder builder)
{
var externalCfg = authConfig.GetSection("External");
if (config.Exists(externalCfg) is false || config.GetConfigBool("Enabled", externalCfg) is false)
{
return;
}
Enabled = true;
foreach (var section in externalCfg.GetChildren())
{
if (section.GetChildren().Any() is false)
{
continue;
}
var signinUrlTemplate = config.GetConfigStr("SigninUrl", externalCfg) ?? "/signin-{0}";
if (config.GetConfigBool("Enabled", section) is false)
{
continue;
}
var key = section.Key.ToLowerInvariant();
var signinUrl = string.Format(signinUrlTemplate, key);
if (DefaultClientConfigs.TryGetValue(key, out var clientConfig) is false)
{
clientConfig = new ExternalAuthClientConfig();
}
clientConfig.Enabled = config.GetConfigBool("Enabled", section, clientConfig.Enabled);
clientConfig.ClientId = config.GetConfigStr("ClientId", section) ?? clientConfig.ClientId;
clientConfig.ClientSecret = config.GetConfigStr("ClientSecret", section) ?? clientConfig.ClientSecret;
clientConfig.AuthUrl = config.GetConfigStr("AuthUrl", section) ?? clientConfig.AuthUrl;
clientConfig.TokenUrl = config.GetConfigStr("TokenUrl", section) ?? clientConfig.TokenUrl;
clientConfig.InfoUrl = config.GetConfigStr("InfoUrl", section) ?? clientConfig.InfoUrl;
clientConfig.EmailUrl = config.GetConfigStr("EmailUrl", section) ?? clientConfig.EmailUrl;
clientConfig.SigninUrl = signinUrl;
clientConfig.ExternalType = section.Key;
ClientConfigs.Add(clientConfig.SigninUrl, clientConfig);
builder.ClientLogger?.LogDebug("External login available for {Key} available on path: {signinUrl}", section.Key, signinUrl);
}
if (ClientConfigs.Where(c => c.Value.Enabled).Any() is false)
{
Enabled = false;
return;
}
BrowserSessionStatusKey = config.GetConfigStr("BrowserSessionStatusKey", externalCfg) ?? "__external_status";
BrowserSessionMessageKey = config.GetConfigStr("BrowserSessionMessageKey", externalCfg) ?? "__external_message";
SignInHtmlTemplate = config.GetConfigStr("SignInHtmlTemplate", externalCfg) ??
"<!DOCTYPE html><html><head><meta charset=\"utf-8\" /><title>Talking To {0}</title></head><body>Loading...{1}</body></html>";
RedirectUrl = config.GetConfigStr("RedirectUrl", externalCfg);
ReturnToPath = config.GetConfigStr("ReturnToPath", externalCfg) ?? "/";
ReturnToPathQueryStringKey = config.GetConfigStr("ReturnToPathQueryStringKey", externalCfg) ?? "return_to";
LoginCommand = config.GetConfigStr("LoginCommand", externalCfg) ?? "select * from auth.login($1,$2,$3,$4)";
ClientAnalyticsData = config.GetConfigStr("ClientAnalyticsData", externalCfg) ?? "{timestamp:new Date().toISOString(),timezone:Intl.DateTimeFormat().resolvedOptions().timeZone,screen:{width:window.screen.width,height:window.screen.height,colorDepth:window.screen.colorDepth,pixelRatio:window.devicePixelRatio,orientation:screen.orientation.type},browser:{userAgent:navigator.userAgent,language:navigator.language,languages:navigator.languages,cookiesEnabled:navigator.cookieEnabled,doNotTrack:navigator.doNotTrack,onLine:navigator.onLine,platform:navigator.platform,vendor:navigator.vendor},memory:{deviceMemory:navigator.deviceMemory,hardwareConcurrency:navigator.hardwareConcurrency},window:{innerWidth:window.innerWidth,innerHeight:window.innerHeight,outerWidth:window.outerWidth,outerHeight:window.outerHeight},location:{href:window.location.href,hostname:window.location.hostname,pathname:window.location.pathname,protocol:window.location.protocol,referrer:document.referrer},performance:{navigation:{type:performance.navigation?.type,redirectCount:performance.navigation?.redirectCount},timing:performance.timing?{loadEventEnd:performance.timing.loadEventEnd,loadEventStart:performance.timing.loadEventStart,domComplete:performance.timing.domComplete,domInteractive:performance.timing.domInteractive,domContentLoadedEventEnd:performance.timing.domContentLoadedEventEnd}:null}}";
ClientAnalyticsIpKey = config.GetConfigStr("ClientAnalyticsIpKey", externalCfg) ?? "ip";
}
}
public class ExternalAuth
{
private readonly ILogger? _clientLogger;
public ExternalAuth(
ExternalAuthConfig? externalAuthConfig,
string connectionString,
WebApplication app,
NpgsqlRestOptions options,
RetryStrategy? retryStrategy,
PostgresConnectionNoticeLoggingMode loggingMode,
ILogger? clientLogger = null)
{
_clientLogger = clientLogger;
if ((externalAuthConfig?.ClientConfigs!).Any(c => c.Value.Enabled) is false)
{
return;
}
app.Use(async (context, next) =>
{
if (externalAuthConfig?.ClientConfigs.TryGetValue(context.Request.Path, out var config) is not true)
{
await next(context);
return;
}
if (config.Enabled is false)
{
await next(context);
return;
}
if (string.Equals(context.Request.Method, "GET", StringComparison.OrdinalIgnoreCase))
{
PrepareResponse(Text.Html, context);
await context.Response.WriteAsync(BuildHtmlTemplate(config, context.Request, externalAuthConfig));
await context.Response.CompleteAsync();
return;
}
if (string.Equals(context.Request.Method, "POST", StringComparison.OrdinalIgnoreCase))
{
PrepareResponse(Text.Plain, context);
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,
connectionString,
retryStrategy,
externalAuthConfig,
loggingMode);
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();
_clientLogger?.LogError(e, "Failed to parse external provider response: {ExternalType}", config.ExternalType);
return;
}
}
await next(context);
});
}
private void PrepareResponse(string contentType, HttpContext context)
{
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 HttpClient? _httpClient = null;
private static readonly string _agent = $"{Guid.NewGuid().ToString()[..8]}";
private const string browserSessionStateKey = "__external_state";
private const string browserSessionParamsKey = "__external_params";
private async Task ProcessAsync(
string code,
ExternalAuthClientConfig config,
HttpContext context,
NpgsqlRestOptions options,
string connectionString,
RetryStrategy? retryStrategy,
ExternalAuthConfig externalAuthConfig,
PostgresConnectionNoticeLoggingMode loggingMode)
{
string? email;
string? name;
string token;
_httpClient ??= new();
using var requestTokenMessage = new HttpRequestMessage(HttpMethod.Post, config.TokenUrl);
requestTokenMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue(Application.Json));
requestTokenMessage.Content = new FormUrlEncodedContent(new Dictionary<string, string>
{
["redirect_uri"] = GetRedirectUrl(config, context.Request, externalAuthConfig),
["code"] = code,
["client_id"] = config.ClientId,
["client_secret"] = config.ClientSecret,
["grant_type"] = "authorization_code"
});
requestTokenMessage.Headers.UserAgent.ParseAdd(_agent);
using var tokenResponse = await _httpClient.SendAsync(requestTokenMessage);
var tokenContent = await tokenResponse.Content.ReadAsStringAsync();
if (!tokenResponse.IsSuccessStatusCode)
{
throw new HttpRequestException($"Token endpoint {config.TokenUrl} returned {tokenResponse.StatusCode} with following content: {tokenContent}");
}
if (string.IsNullOrEmpty(tokenContent))
{
throw new HttpRequestException($"Token endpoint {config.TokenUrl} returned {tokenResponse.StatusCode} with empty content.");
}
try
{
JsonNode node = JsonNode.Parse(tokenContent) ??
throw new ArgumentException("token json node is null");
token = (node["access_token"]?.ToString()) ??
throw new ArgumentException("access_token retrieved from the external provider is null");
}
catch (Exception e)
{
throw new ArgumentException(string.Format("Failed to parse the token response: {0}", e.Message), e);
}
using var infoRequest = new HttpRequestMessage(HttpMethod.Get, config.InfoUrl);
infoRequest.Headers.UserAgent.ParseAdd(_agent);
infoRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
using var infoResponse = await _httpClient.SendAsync(infoRequest);
var infoContent = await infoResponse.Content.ReadAsStringAsync();
JsonNode infoNode;
if (!infoResponse.IsSuccessStatusCode)
{
throw new HttpRequestException($"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
{
infoNode = JsonNode.Parse(infoContent) ??
throw new ArgumentException("info json node is null");
// Email parsing
email = infoNode["email"]?.ToString() ?? // Google, GitHub, Facebook, Microsoft
infoNode["userPrincipalName"]?.ToString() ?? // Microsoft (organizational accounts)
infoNode?["elements"]?[0]?["handle~"]?["emailAddress"]?.ToString(); // LinkedIn
#pragma warning disable CS8602 // Dereference of a possibly null reference.
name = infoNode["localizedLastName"] is not null ?
$"{infoNode["localizedFirstName"]} {infoNode["localizedLastName"]}".Trim() : // linkedin format
infoNode["name"]?.ToString(); // normal format
#pragma warning restore CS8602 // Dereference of a possibly null reference.
}
catch (Exception e)
{
throw new ArgumentException(string.Format("Failed to parse the info response: {0}", e.Message), e);
}
if (email is null && config.EmailUrl is not null)
{
using var emailRequest = new HttpRequestMessage(HttpMethod.Get, config.EmailUrl);
infoRequest.Headers.UserAgent.ParseAdd(_agent);
infoRequest.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
using var emailResponse = await _httpClient.SendAsync(emailRequest);
var emailContent = await emailResponse.Content.ReadAsStringAsync();
if (!emailResponse.IsSuccessStatusCode)
{
throw new HttpRequestException($"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");
infoNode["emailRequest"] = node;
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");
}
//var middlewareLogger = NpgsqlRestMiddleware.Logger;
await using var connection = new NpgsqlConnection(connectionString);
if (options.LogConnectionNoticeEvents)
{
connection.Notice += (sender, args) =>
{
NpgsqlRestLogger.LogConnectionNotice(args.Notice, loggingMode);
};
}
await connection.OpenRetryAsync(options.ConnectionRetryOptions, context.RequestAborted);
await using var command = connection.CreateCommand();
command.CommandText = externalAuthConfig!.LoginCommand;
var paramCount = command.CommandText.PgCountParams();
if (paramCount >= 1) command.Parameters.Add(new NpgsqlParameter()
{
Value = config.ExternalType,
NpgsqlDbType = NpgsqlTypes.NpgsqlDbType.Text
});
if (paramCount >= 2) command.Parameters.Add(new NpgsqlParameter()
{
Value = email,
NpgsqlDbType = NpgsqlTypes.NpgsqlDbType.Text
});
if (paramCount >= 3) command.Parameters.Add(new NpgsqlParameter()
{
Value = name is not null ? name : DBNull.Value,
NpgsqlDbType = NpgsqlTypes.NpgsqlDbType.Text
});
if (paramCount >= 4) command.Parameters.Add(new NpgsqlParameter()
{
Value = infoNode is not null ? infoContent.ToString() : DBNull.Value,
// Unknown (not Json): PostgreSQL resolves it server-side via the target type's input
// function, so the LoginCommand's data parameter may be declared json, jsonb OR text
// (text/json/jsonb as documented). A hardcoded Json matches only a json parameter.
NpgsqlDbType = NpgsqlTypes.NpgsqlDbType.Unknown
});
if (paramCount >= 5)
{
var query = context.Request.Query["analyticsData"].ToString();
if (string.IsNullOrEmpty(query) is false)
{
var analyticsData = JsonNode.Parse(query);
if (analyticsData is not null)
{
if (string.IsNullOrEmpty(externalAuthConfig!.ClientAnalyticsIpKey) is false)
{
analyticsData[externalAuthConfig!.ClientAnalyticsIpKey] = context.Request.GetClientIpAddress();
}
command.Parameters.Add(new NpgsqlParameter()
{
Value = analyticsData.ToJsonString(),
// Unknown (not Json): allow the analytics parameter to be json, jsonb or text.
NpgsqlDbType = NpgsqlTypes.NpgsqlDbType.Unknown
});
}
}
}
CommandLogger.LogCommand(command, Logger, "ExternalAuth.Login");
await LoginHandler.HandleAsync(
command,
context,
retryStrategy,
tracePath: "ExternalAuth.ProcessAsync",
performHashVerification: false,
assignUserPrincipalToContext: false);
}
private static string BuildHtmlTemplate(ExternalAuthClientConfig config, HttpRequest request, ExternalAuthConfig externalAuthConfig)
{
string redirectUrl = GetRedirectUrl(config, request, externalAuthConfig);
var state = Guid.NewGuid().ToString();
var redirectTo = "/";
var authUrl = string.Format(config.AuthUrl, config.ClientId, redirectUrl, state);
var analyticsData = externalAuthConfig?.ClientAnalyticsData is null ? "null" : externalAuthConfig!.ClientAnalyticsData;
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
analyticsData//10
));
}
private static string GetRedirectUrl(ExternalAuthClientConfig clientConfig, HttpRequest request, ExternalAuthConfig externalAuthConfig)
{
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 analyticsData = {10};
if (analyticsData) {{
signinUrl += "?analyticsData=" + encodeURIComponent(JSON.stringify(analyticsData));
}}
var params = paramsToObject(window.location.search);
var keys = Object.keys(params);
if (!params.error && !params.state) {{
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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