#pragma warning disable CS1591
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Net;
using MediaBrowser.Controller.Security;
using Microsoft.AspNetCore.Http;
using Microsoft.Net.Http.Headers;
namespace Emby.Server.Implementations.HttpServer.Security
{
public class AuthorizationContext : IAuthorizationContext
{
private readonly IAuthenticationRepository _authRepo;
private readonly IUserManager _userManager;
public AuthorizationContext(IAuthenticationRepository authRepo, IUserManager userManager)
{
_authRepo = authRepo;
_userManager = userManager;
}
public AuthorizationInfo GetAuthorizationInfo(HttpContext requestContext)
{
if (requestContext.Request.HttpContext.Items.TryGetValue("AuthorizationInfo", out var cached))
{
return (AuthorizationInfo)cached;
}
return GetAuthorization(requestContext);
}
public AuthorizationInfo GetAuthorizationInfo(HttpRequest requestContext)
{
var auth = GetAuthorizationDictionary(requestContext);
var (authInfo, _) =
GetAuthorizationInfoFromDictionary(auth, requestContext.Headers, requestContext.Query);
return authInfo;
}
///
/// Gets the authorization.
///
/// The HTTP req.
/// Dictionary{System.StringSystem.String}.
private AuthorizationInfo GetAuthorization(HttpContext httpReq)
{
var auth = GetAuthorizationDictionary(httpReq);
var (authInfo, originalAuthInfo) =
GetAuthorizationInfoFromDictionary(auth, httpReq.Request.Headers, httpReq.Request.Query);
if (originalAuthInfo != null)
{
httpReq.Request.HttpContext.Items["OriginalAuthenticationInfo"] = originalAuthInfo;
}
httpReq.Request.HttpContext.Items["AuthorizationInfo"] = authInfo;
return authInfo;
}
private (AuthorizationInfo authInfo, AuthenticationInfo originalAuthenticationInfo) GetAuthorizationInfoFromDictionary(
in Dictionary auth,
in IHeaderDictionary headers,
in IQueryCollection queryString)
{
string deviceId = null;
string device = null;
string client = null;
string version = null;
string token = null;
if (auth != null)
{
auth.TryGetValue("DeviceId", out deviceId);
auth.TryGetValue("Device", out device);
auth.TryGetValue("Client", out client);
auth.TryGetValue("Version", out version);
auth.TryGetValue("Token", out token);
}
if (string.IsNullOrEmpty(token))
{
token = headers["X-Emby-Token"];
}
if (string.IsNullOrEmpty(token))
{
token = headers["X-MediaBrowser-Token"];
}
if (string.IsNullOrEmpty(token))
{
token = queryString["ApiKey"];
}
// TODO deprecate this query parameter.
if (string.IsNullOrEmpty(token))
{
token = queryString["api_key"];
}
var authInfo = new AuthorizationInfo
{
Client = client,
Device = device,
DeviceId = deviceId,
Version = version,
Token = token
};
if (string.IsNullOrWhiteSpace(token))
{
// Request doesn't contain a token.
return (null, null);
}
var result = _authRepo.Get(new AuthenticationInfoQuery
{
AccessToken = token
});
var originalAuthenticationInfo = result.Items.Count > 0 ? result.Items[0] : null;
if (originalAuthenticationInfo != null)
{
var updateToken = false;
// TODO: Remove these checks for IsNullOrWhiteSpace
if (string.IsNullOrWhiteSpace(authInfo.Client))
{
authInfo.Client = originalAuthenticationInfo.AppName;
}
if (string.IsNullOrWhiteSpace(authInfo.DeviceId))
{
authInfo.DeviceId = originalAuthenticationInfo.DeviceId;
}
// Temporary. TODO - allow clients to specify that the token has been shared with a casting device
var allowTokenInfoUpdate = authInfo.Client == null || authInfo.Client.IndexOf("chromecast", StringComparison.OrdinalIgnoreCase) == -1;
if (string.IsNullOrWhiteSpace(authInfo.Device))
{
authInfo.Device = originalAuthenticationInfo.DeviceName;
}
else if (!string.Equals(authInfo.Device, originalAuthenticationInfo.DeviceName, StringComparison.OrdinalIgnoreCase))
{
if (allowTokenInfoUpdate)
{
updateToken = true;
originalAuthenticationInfo.DeviceName = authInfo.Device;
}
}
if (string.IsNullOrWhiteSpace(authInfo.Version))
{
authInfo.Version = originalAuthenticationInfo.AppVersion;
}
else if (!string.Equals(authInfo.Version, originalAuthenticationInfo.AppVersion, StringComparison.OrdinalIgnoreCase))
{
if (allowTokenInfoUpdate)
{
updateToken = true;
originalAuthenticationInfo.AppVersion = authInfo.Version;
}
}
if ((DateTime.UtcNow - originalAuthenticationInfo.DateLastActivity).TotalMinutes > 3)
{
originalAuthenticationInfo.DateLastActivity = DateTime.UtcNow;
updateToken = true;
}
if (!originalAuthenticationInfo.UserId.Equals(Guid.Empty))
{
authInfo.User = _userManager.GetUserById(originalAuthenticationInfo.UserId);
if (authInfo.User != null && !string.Equals(authInfo.User.Username, originalAuthenticationInfo.UserName, StringComparison.OrdinalIgnoreCase))
{
originalAuthenticationInfo.UserName = authInfo.User.Username;
updateToken = true;
}
authInfo.IsApiKey = true;
}
else
{
authInfo.IsApiKey = false;
}
if (updateToken)
{
_authRepo.Update(originalAuthenticationInfo);
}
}
return (authInfo, originalAuthenticationInfo);
}
///
/// Gets the auth.
///
/// The HTTP req.
/// Dictionary{System.StringSystem.String}.
private Dictionary GetAuthorizationDictionary(HttpContext httpReq)
{
var auth = httpReq.Request.Headers["X-Emby-Authorization"];
if (string.IsNullOrEmpty(auth))
{
auth = httpReq.Request.Headers[HeaderNames.Authorization];
}
return GetAuthorization(auth);
}
///
/// Gets the auth.
///
/// The HTTP req.
/// Dictionary{System.StringSystem.String}.
private Dictionary GetAuthorizationDictionary(HttpRequest httpReq)
{
var auth = httpReq.Headers["X-Emby-Authorization"];
if (string.IsNullOrEmpty(auth))
{
auth = httpReq.Headers[HeaderNames.Authorization];
}
return GetAuthorization(auth);
}
///
/// Gets the authorization.
///
/// The authorization header.
/// Dictionary{System.StringSystem.String}.
private Dictionary GetAuthorization(string authorizationHeader)
{
if (authorizationHeader == null)
{
return null;
}
var parts = authorizationHeader.Split(new[] { ' ' }, 2);
// There should be at least to parts
if (parts.Length != 2)
{
return null;
}
var acceptedNames = new[] { "MediaBrowser", "Emby" };
// It has to be a digest request
if (!acceptedNames.Contains(parts[0], StringComparer.OrdinalIgnoreCase))
{
return null;
}
// Remove uptil the first space
authorizationHeader = parts[1];
parts = authorizationHeader.Split(',');
var result = new Dictionary(StringComparer.OrdinalIgnoreCase);
foreach (var item in parts)
{
var param = item.Trim().Split(new[] { '=' }, 2);
if (param.Length == 2)
{
var value = NormalizeValue(param[1].Trim(new[] { '"' }));
result[param[0]] = value;
}
}
return result;
}
private static string NormalizeValue(string value)
{
return string.IsNullOrEmpty(value) ? value : WebUtility.HtmlEncode(value);
}
}
}