/// <summary>
/// Creates a ClientContext token for the incoming WebAPI request. This is done by
/// - looking up the servicesToken
/// - extracting the cacheKey
/// - get the AccessToken from cache. If the AccessToken is expired a new one is requested using the refresh token
/// - creation of a ClientContext object based on the AccessToken
/// </summary>
/// <param name="httpControllerContext">Information about the HTTP request that reached the WebAPI controller</param>
/// <returns>A valid ClientContext object</returns>
public static ClientContext GetClientContext(HttpControllerContext httpControllerContext)
{
if (httpControllerContext == null)
{
throw new ArgumentNullException("httpControllerContext");
}
string cacheKey = GetCacheKeyValue(httpControllerContext);
if (!String.IsNullOrEmpty(cacheKey))
{
WebAPIContexCacheItem cacheItem = WebAPIContextCache.Instance.Get(cacheKey);
//request a new access token from ACS whenever our current access token will expire in less than 1 hour
if (cacheItem.AccessToken.ExpiresOn < (DateTime.Now.AddHours(-1)))
{
Uri targetUri = new Uri(cacheItem.SharePointServiceContext.HostWebUrl);
OAuth2AccessTokenResponse accessToken = TokenHelper.GetAccessToken(cacheItem.RefreshToken, TokenHelper.SharePointPrincipal, targetUri.Authority, TokenHelper.GetRealmFromTargetUrl(targetUri));
cacheItem.AccessToken = accessToken;
//update the cache
WebAPIContextCache.Instance.Put(cacheKey, cacheItem);
Log.Info(CoreResources.Services_TokenRefreshed, cacheKey, cacheItem.SharePointServiceContext.HostWebUrl);
}
return(TokenHelper.GetClientContextWithAccessToken(cacheItem.SharePointServiceContext.HostWebUrl, cacheItem.AccessToken.AccessToken));
}
else
{
Log.Warning(Constants.LOGGING_SOURCE, CoreResources.Services_CookieWithCachKeyNotFound);
throw new Exception("The cookie with the cachekey was not found...nothing can be retrieved from cache, so no clientcontext can be created.");
}
}
/// <summary>
/// Adds an item to the cache. Updates if the item already existed
/// </summary>
/// <param name="cacheKey">Key to cache the item</param>
/// <param name="sharePointServiceContextCacheItem">A <see cref="WebAPIContexCacheItem"/> object</param>
public void Put(string cacheKey, WebAPIContexCacheItem sharePointServiceContextCacheItem)
{
if (!clientContextCache.ContainsKey(cacheKey))
{
clientContextCache.Add(cacheKey, sharePointServiceContextCacheItem);
}
else
{
clientContextCache[cacheKey] = sharePointServiceContextCacheItem;
}
}
/// <summary>
/// Adds an item to the cache. Updates if the item already existed
/// </summary>
/// <param name="cacheKey">Key to cache the item</param>
/// <param name="sharePointServiceContextCacheItem">A <see cref="WebAPIContexCacheItem"/> object</param>
public void Put(string cacheKey, WebAPIContexCacheItem sharePointServiceContextCacheItem)
{
if (!this.clientContextCache.ContainsKey(cacheKey))
{
this.clientContextCache.Add(cacheKey, sharePointServiceContextCacheItem);
}
else
{
this.clientContextCache[cacheKey] = sharePointServiceContextCacheItem;
}
}
/// <summary>
/// Uses the information regarding the requesting app to obtain an access token and caches that using the cachekey.
/// This method is called from the Register WebAPI service api.
/// </summary>
/// <param name="sharePointServiceContext">Object holding information about the requesting SharePoint app</param>
public static void AddToCache(WebAPIContext sharePointServiceContext)
{
if (sharePointServiceContext == null)
{
throw new ArgumentNullException("sharePointServiceContext");
}
TokenHelper.ClientId = sharePointServiceContext.ClientId;
TokenHelper.ClientSecret = sharePointServiceContext.ClientSecret;
TokenHelper.HostedAppHostName = sharePointServiceContext.HostedAppHostName;
SharePointContextToken sharePointContextToken = TokenHelper.ReadAndValidateContextToken(sharePointServiceContext.Token);
OAuth2AccessTokenResponse accessToken = TokenHelper.GetAccessToken(sharePointContextToken, new Uri(sharePointServiceContext.HostWebUrl).Authority);
WebAPIContexCacheItem cacheItem = new WebAPIContexCacheItem()
{
RefreshToken = sharePointContextToken.RefreshToken,
AccessToken = accessToken,
SharePointServiceContext = sharePointServiceContext
};
WebAPIContextCache.Instance.Put(sharePointServiceContext.CacheKey, cacheItem);
}
/// <summary>
/// Uses the information regarding the requesting app to obtain an access token and caches that using the cachekey.
/// This method is called from the Register WebAPI service api.
/// </summary>
/// <param name="sharePointServiceContext">Object holding information about the requesting SharePoint app</param>
public static void AddToCache(WebAPIContext sharePointServiceContext)
{
if (sharePointServiceContext == null)
throw new ArgumentNullException("sharePointServiceContext");
TokenHelper.ClientId = sharePointServiceContext.ClientId;
TokenHelper.ClientSecret = sharePointServiceContext.ClientSecret;
TokenHelper.HostedAppHostName = sharePointServiceContext.HostedAppHostName;
SharePointContextToken sharePointContextToken = TokenHelper.ReadAndValidateContextToken(sharePointServiceContext.Token);
OAuth2AccessTokenResponse accessToken = TokenHelper.GetAccessToken(sharePointContextToken, new Uri(sharePointServiceContext.HostWebUrl).Authority);
WebAPIContexCacheItem cacheItem = new WebAPIContexCacheItem()
{
RefreshToken = sharePointContextToken.RefreshToken,
AccessToken = accessToken,
SharePointServiceContext = sharePointServiceContext
};
WebAPIContextCache.Instance.Put(sharePointServiceContext.CacheKey, cacheItem);
}
/// <summary>
/// Adds an item to the cache. Updates if the item already existed
/// </summary>
/// <param name="cacheKey">Key to cache the item</param>
/// <param name="sharePointServiceContextCacheItem">A <see cref="WebAPIContexCacheItem"/> object</param>
public void Put(string cacheKey, WebAPIContexCacheItem sharePointServiceContextCacheItem)
{
CacheProvider.Put(cacheKey, sharePointServiceContextCacheItem);
}