/// <summary>
/// Do the actual upload to Picasa
/// </summary>
/// <param name="surfaceToUpload">Image to upload</param>
/// <param name="outputSettings"></param>
/// <param name="title"></param>
/// <param name="filename"></param>
/// <returns>PicasaResponse</returns>
public static string UploadToPicasa(ISurface surfaceToUpload, SurfaceOutputSettings outputSettings, string title, string filename) {
// Fill the OAuth2Settings
OAuth2Settings settings = new OAuth2Settings();
settings.AuthUrlPattern = AuthUrl;
settings.TokenUrl = TokenUrl;
settings.CloudServiceName = "Picasa";
settings.ClientId = PicasaCredentials.ClientId;
settings.ClientSecret = PicasaCredentials.ClientSecret;
settings.AuthorizeMode = OAuth2AuthorizeMode.LocalServer;
// Copy the settings from the config, which is kept in memory and on the disk
settings.RefreshToken = Config.RefreshToken;
settings.AccessToken = Config.AccessToken;
settings.AccessTokenExpires = Config.AccessTokenExpires;
try {
var webRequest = OAuth2Helper.CreateOAuth2WebRequest(HTTPMethod.POST, string.Format(UploadUrl, Config.UploadUser, Config.UploadAlbum), settings);
if (Config.AddFilename) {
webRequest.Headers.Add("Slug", NetworkHelper.EscapeDataString(filename));
}
SurfaceContainer container = new SurfaceContainer(surfaceToUpload, outputSettings, filename);
container.Upload(webRequest);
string response = NetworkHelper.GetResponseAsString(webRequest);
return ParseResponse(response);
} finally {
// Copy the settings back to the config, so they are stored.
Config.RefreshToken = settings.RefreshToken;
Config.AccessToken = settings.AccessToken;
Config.AccessTokenExpires = settings.AccessTokenExpires;
Config.IsDirty = true;
IniConfig.Save();
}
}
/// <summary>
/// Do the actual upload to Imgur
/// For more details on the available parameters, see: http://api.imgur.com/resources_anon
/// </summary>
/// <param name="surfaceToUpload">ISurface to upload</param>
/// <param name="outputSettings">OutputSettings for the image file format</param>
/// <param name="title">Title</param>
/// <param name="filename">Filename</param>
/// <returns>ImgurInfo with details</returns>
public static ImgurInfo UploadToImgur(ISurface surfaceToUpload, SurfaceOutputSettings outputSettings, string title, string filename) {
IDictionary<string, object> otherParameters = new Dictionary<string, object>();
// add title
if (title != null && Config.AddTitle) {
otherParameters.Add("title", title);
}
// add filename
if (filename != null && Config.AddFilename) {
otherParameters.Add("name", filename);
}
string responseString;
if (Config.AnonymousAccess) {
// add key, we only use the other parameters for the AnonymousAccess
//otherParameters.Add("key", IMGUR_ANONYMOUS_API_KEY);
HttpWebRequest webRequest = NetworkHelper.CreateWebRequest(Config.ImgurApi3Url + "/upload.xml?" + NetworkHelper.GenerateQueryParameters(otherParameters), HTTPMethod.POST);
webRequest.ContentType = "image/" + outputSettings.Format;
webRequest.ServicePoint.Expect100Continue = false;
SetClientId(webRequest);
try {
using (var requestStream = webRequest.GetRequestStream()) {
ImageOutput.SaveToStream(surfaceToUpload, requestStream, outputSettings);
}
using (WebResponse response = webRequest.GetResponse()) {
using (StreamReader reader = new StreamReader(response.GetResponseStream(), true)) {
responseString = reader.ReadToEnd();
}
LogRateLimitInfo(response);
}
} catch (Exception ex) {
LOG.Error("Upload to imgur gave an exeption: ", ex);
throw;
}
} else {
var oauth2Settings = new OAuth2Settings();
oauth2Settings.AuthUrlPattern = AuthUrlPattern;
oauth2Settings.TokenUrl = TokenUrl;
oauth2Settings.RedirectUrl = "https://imgur.com";
oauth2Settings.CloudServiceName = "Imgur";
oauth2Settings.ClientId = ImgurCredentials.CONSUMER_KEY;
oauth2Settings.ClientSecret = ImgurCredentials.CONSUMER_SECRET;
oauth2Settings.AuthorizeMode = OAuth2AuthorizeMode.EmbeddedBrowser;
oauth2Settings.BrowserSize = new Size(680, 880);
// Copy the settings from the config, which is kept in memory and on the disk
oauth2Settings.RefreshToken = Config.RefreshToken;
oauth2Settings.AccessToken = Config.AccessToken;
oauth2Settings.AccessTokenExpires = Config.AccessTokenExpires;
try
{
var webRequest = OAuth2Helper.CreateOAuth2WebRequest(HTTPMethod.POST, Config.ImgurApi3Url + "/upload.xml", oauth2Settings);
otherParameters.Add("image", new SurfaceContainer(surfaceToUpload, outputSettings, filename));
NetworkHelper.WriteMultipartFormData(webRequest, otherParameters);
responseString = NetworkHelper.GetResponseAsString(webRequest);
}
finally
{
// Copy the settings back to the config, so they are stored.
Config.RefreshToken = oauth2Settings.RefreshToken;
Config.AccessToken = oauth2Settings.AccessToken;
Config.AccessTokenExpires = oauth2Settings.AccessTokenExpires;
Config.IsDirty = true;
IniConfig.Save();
}
}
return ImgurInfo.ParseResponse(responseString);
}
/// <summary>
/// Authenticate via a local server by using the LocalServerCodeReceiver
/// If this works, return the code
/// </summary>
/// <param name="settings">OAuth2Settings with the Auth / Token url etc</param>
/// <returns>true if completed</returns>
private static bool AuthenticateViaLocalServer(OAuth2Settings settings)
{
var codeReceiver = new LocalServerCodeReceiver();
IDictionary<string, string> result = codeReceiver.ReceiveCode(settings);
string code;
if (result.TryGetValue(CODE, out code) && !string.IsNullOrEmpty(code)) {
settings.Code = code;
GenerateRefreshToken(settings);
return true;
}
string error;
if (result.TryGetValue("error", out error)) {
string errorDescription;
if (result.TryGetValue("error_description", out errorDescription)) {
throw new Exception(errorDescription);
}
if ("access_denied" == error) {
throw new UnauthorizedAccessException("Access denied");
} else {
throw new Exception(error);
}
}
return false;
}
/// <summary>
/// Authenticate via an embedded browser
/// If this works, return the code
/// </summary>
/// <param name="settings">OAuth2Settings with the Auth / Token url etc</param>
/// <returns>true if completed, false if canceled</returns>
private static bool AuthenticateViaEmbeddedBrowser(OAuth2Settings settings)
{
if (string.IsNullOrEmpty(settings.CloudServiceName)) {
throw new ArgumentNullException("CloudServiceName");
}
if (settings.BrowserSize == Size.Empty) {
throw new ArgumentNullException("BrowserSize");
}
OAuthLoginForm loginForm = new OAuthLoginForm(string.Format("Authorize {0}", settings.CloudServiceName), settings.BrowserSize, settings.FormattedAuthUrl, settings.RedirectUrl);
loginForm.ShowDialog();
if (loginForm.IsOk) {
string code;
if (loginForm.CallbackParameters.TryGetValue(CODE, out code) && !string.IsNullOrEmpty(code)) {
settings.Code = code;
GenerateRefreshToken(settings);
return true;
}
}
return false;
}
/// <summary>
/// Generate an OAuth 2 Token by using the supplied code
/// </summary>
/// <param name="code">Code to get the RefreshToken</param>
/// <param name="settings">OAuth2Settings to update with the information that was retrieved</param>
public static void GenerateRefreshToken(OAuth2Settings settings)
{
IDictionary<string, object> data = new Dictionary<string, object>();
// Use the returned code to get a refresh code
data.Add(CODE, settings.Code);
data.Add(CLIENT_ID, settings.ClientId);
data.Add(REDIRECT_URI, settings.RedirectUrl);
data.Add(CLIENT_SECRET, settings.ClientSecret);
data.Add(GRANT_TYPE, AUTHORIZATION_CODE);
foreach (string key in settings.AdditionalAttributes.Keys) {
data.Add(key, settings.AdditionalAttributes[key]);
}
HttpWebRequest webRequest = NetworkHelper.CreateWebRequest(settings.TokenUrl, HTTPMethod.POST);
NetworkHelper.UploadFormUrlEncoded(webRequest, data);
string accessTokenJsonResult = NetworkHelper.GetResponseAsString(webRequest, true);
IDictionary<string, object> refreshTokenResult = JSONHelper.JsonDecode(accessTokenJsonResult);
if (refreshTokenResult.ContainsKey("error")) {
if (refreshTokenResult.ContainsKey("error_description")) {
throw new Exception(string.Format("{0} - {1}", refreshTokenResult["error"], refreshTokenResult["error_description"]));
} else {
throw new Exception((string)refreshTokenResult["error"]);
}
}
// gives as described here: https://developers.google.com/identity/protocols/OAuth2InstalledApp
// "access_token":"1/fFAGRNJru1FTz70BzhT3Zg",
// "expires_in":3920,
// "token_type":"Bearer",
// "refresh_token":"1/xEoDL4iW3cxlI7yDbSRFYNG01kVKM2C-259HOF2aQbI"
settings.AccessToken = (string)refreshTokenResult[ACCESS_TOKEN] as string;
settings.RefreshToken = (string)refreshTokenResult[REFRESH_TOKEN] as string;
object seconds = refreshTokenResult[EXPIRES_IN];
if (seconds != null) {
settings.AccessTokenExpires = DateTimeOffset.Now.AddSeconds((double)seconds);
}
settings.Code = null;
}
/// <summary>
/// Go out and retrieve a new access token via refresh-token with the TokenUrl in the settings
/// Will upate the access token, refresh token, expire date
/// </summary>
/// <param name="settings"></param>
public static void GenerateAccessToken(OAuth2Settings settings)
{
IDictionary<string, object> data = new Dictionary<string, object>();
data.Add(REFRESH_TOKEN, settings.RefreshToken);
data.Add(CLIENT_ID, settings.ClientId);
data.Add(CLIENT_SECRET, settings.ClientSecret);
data.Add(GRANT_TYPE, REFRESH_TOKEN);
foreach (string key in settings.AdditionalAttributes.Keys) {
data.Add(key, settings.AdditionalAttributes[key]);
}
HttpWebRequest webRequest = NetworkHelper.CreateWebRequest(settings.TokenUrl, HTTPMethod.POST);
NetworkHelper.UploadFormUrlEncoded(webRequest, data);
string accessTokenJsonResult = NetworkHelper.GetResponseAsString(webRequest, true);
// gives as described here: https://developers.google.com/identity/protocols/OAuth2InstalledApp
// "access_token":"1/fFAGRNJru1FTz70BzhT3Zg",
// "expires_in":3920,
// "token_type":"Bearer",
IDictionary<string, object> accessTokenResult = JSONHelper.JsonDecode(accessTokenJsonResult);
if (accessTokenResult.ContainsKey("error")) {
if ("invalid_grant" == (string)accessTokenResult["error"]) {
// Refresh token has also expired, we need a new one!
settings.RefreshToken = null;
settings.AccessToken = null;
settings.AccessTokenExpires = DateTimeOffset.MinValue;
settings.Code = null;
return;
} else {
if (accessTokenResult.ContainsKey("error_description")) {
throw new Exception(string.Format("{0} - {1}", accessTokenResult["error"], accessTokenResult["error_description"]));
} else {
throw new Exception((string)accessTokenResult["error"]);
}
}
}
settings.AccessToken = (string)accessTokenResult[ACCESS_TOKEN] as string;
if (accessTokenResult.ContainsKey(REFRESH_TOKEN)) {
// Refresh the refresh token :)
settings.RefreshToken = (string)accessTokenResult[REFRESH_TOKEN] as string;
}
object seconds = accessTokenResult[EXPIRES_IN];
if (seconds != null) {
settings.AccessTokenExpires = DateTimeOffset.Now.AddSeconds((double)seconds);
} else {
settings.AccessTokenExpires = DateTimeOffset.MaxValue;
}
}
/// <summary>
/// CreateWebRequest ready for OAuth 2 access
/// </summary>
/// <param name="method">HTTPMethod</param>
/// <param name="url"></param>
/// <param name="settings">OAuth2Settings</param>
/// <returns>HttpWebRequest</returns>
public static HttpWebRequest CreateOAuth2WebRequest(HTTPMethod method, string url, OAuth2Settings settings)
{
CheckAndAuthenticateOrRefresh(settings);
HttpWebRequest webRequest = NetworkHelper.CreateWebRequest(url, method);
AddOAuth2Credentials(webRequest, settings);
return webRequest;
}
/// <summary>
/// Check and authenticate or refresh tokens
/// </summary>
/// <param name="settings">OAuth2Settings</param>
public static void CheckAndAuthenticateOrRefresh(OAuth2Settings settings)
{
// Get Refresh / Access token
if (string.IsNullOrEmpty(settings.RefreshToken)) {
if (!Authenticate(settings)) {
throw new Exception("Authentication cancelled");
}
}
if (settings.IsAccessTokenExpired) {
GenerateAccessToken(settings);
// Get Refresh / Access token
if (string.IsNullOrEmpty(settings.RefreshToken)) {
if (!Authenticate(settings)) {
throw new Exception("Authentication cancelled");
}
GenerateAccessToken(settings);
}
}
if (settings.IsAccessTokenExpired) {
throw new Exception("Authentication failed");
}
}
/// <summary>
/// Authenticate by using the mode specified in the settings
/// </summary>
/// <param name="settings">OAuth2Settings</param>
/// <returns>false if it was canceled, true if it worked, exception if not</returns>
public static bool Authenticate(OAuth2Settings settings)
{
bool completed = true;
switch (settings.AuthorizeMode) {
case OAuth2AuthorizeMode.LocalServer:
completed = AuthenticateViaLocalServer(settings);
break;
case OAuth2AuthorizeMode.EmbeddedBrowser:
completed = AuthenticateViaEmbeddedBrowser(settings);
break;
default:
throw new NotImplementedException(string.Format("Authorize mode '{0}' is not 'yet' implemented.", settings.AuthorizeMode));
}
return completed;
}
/// <summary>
/// Simple helper to add the Authorization Bearer header
/// </summary>
/// <param name="webRequest">WebRequest</param>
/// <param name="settings">OAuth2Settings</param>
public static void AddOAuth2Credentials(HttpWebRequest webRequest, OAuth2Settings settings)
{
if (!string.IsNullOrEmpty(settings.AccessToken)) {
webRequest.Headers.Add("Authorization", "Bearer " + settings.AccessToken);
}
}
/// <summary>
/// The OAuth code receiver
/// </summary>
/// <param name="authorizationUrl"></param>
/// <returns>Dictionary with values</returns>
public IDictionary<string, string> ReceiveCode(OAuth2Settings oauth2Settings)
{
// Set the redirect URL on the settings
oauth2Settings.RedirectUrl = RedirectUri;
_cloudServiceName = oauth2Settings.CloudServiceName;
using (var listener = new HttpListener()) {
listener.Prefixes.Add(oauth2Settings.RedirectUrl);
try {
listener.Start();
// Get the formatted FormattedAuthUrl
string authorizationUrl = oauth2Settings.FormattedAuthUrl;
LOG.DebugFormat("Open a browser with: {0}", authorizationUrl);
Process.Start(authorizationUrl);
// Wait to get the authorization code response.
var context = listener.BeginGetContext(new AsyncCallback(ListenerCallback), listener);
_ready.Reset();
while (!context.AsyncWaitHandle.WaitOne(1000, true)) {
LOG.Debug("Waiting for response");
}
} catch (Exception) {
// Make sure we can clean up, also if the thead is aborted
_ready.Set();
throw;
} finally {
_ready.WaitOne();
listener.Close();
}
}
return _returnValues;
}
