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OAuth2.cs
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OAuth2.cs
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/**
* A simple C# OAuth2 auth-code wrapper library.
*
* @author
* Stian Hanger ([email protected])
*
* @source
* https://github.com/nagilum/oauth2-csharp
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.Json;
using System.Web;
/// <summary>
/// A simple C# OAuth2 auth-code wrapper library.
/// </summary>
public class OAuth2 {
#region Class functionality
/// <summary>
/// Construct a OAuth2 forwarding URI to redirect with.
/// </summary>
/// <param name="provider">OAuth2 provider wrapper.</param>
/// <param name="redirectUri">URI to redirect back to the system.</param>
/// <param name="locale">Language locale for provider interface.</param>
/// <returns>URI to redirect system to, for user authorization.</returns>
public static string CreateRedirect(OAuth2Provider provider, string redirectUri, string locale = "en") {
var parameters = new Dictionary<string, string> {
{"client_id", provider.ClientId},
{"display", "page"},
{"locale", locale},
{"redirect_uri", redirectUri},
{"response_type", "code"}
};
if (provider.Offline)
parameters.Add(
"access_type",
"offline");
if (!string.IsNullOrWhiteSpace(provider.Scope))
parameters.Add(
"scope",
provider.Scope);
if (!string.IsNullOrWhiteSpace(provider.State))
parameters.Add(
"state",
provider.State);
var qs = buildQueryString(parameters);
var url =
provider.AuthUri + "?" +
qs;
return url;
}
/// <summary>
/// Request a access token by exchanging a auth code.
/// </summary>
/// <param name="provider">OAuth2 provider wrapper.</param>
/// <param name="redirectUri">URI to redirect back to the system.</param>
/// <param name="code">Authorization code.</param>
/// <returns>Authentication response object.</returns>
public static OAuth2AuthenticateResponse AuthenticateByCode(OAuth2Provider provider, string redirectUri, string code) {
var parameters = new Dictionary<string, string> {
{"client_id", provider.ClientId},
{"client_secret", provider.ClientSecret},
{"redirect_uri", redirectUri},
{"code", code},
{"grant_type", "authorization_code"}
};
if (!string.IsNullOrWhiteSpace(provider.Scope))
parameters.Add(
"scope",
provider.Scope);
if (!string.IsNullOrWhiteSpace(provider.State))
parameters.Add(
"state",
provider.State);
var reply = request(
provider.AccessTokenUri,
payload: buildQueryString(parameters));
return interpretReply(reply);
}
/// <summary>
/// Request a new access token by refreshing an old.
/// </summary>
/// <param name="provider">OAuth2 provider wrapper.</param>
/// <param name="refreshToken">Access/refresh token to use.</param>
/// <returns>Authentication response object.</returns>
public static OAuth2AuthenticateResponse AuthenticateByToken(OAuth2Provider provider, string refreshToken) {
var parameters = new Dictionary<string, string> {
{"client_id", provider.ClientId},
{"client_secret", provider.ClientSecret},
{"refresh_token", refreshToken},
{"grant_type", "refresh_token"}
};
if (!string.IsNullOrWhiteSpace(provider.Scope))
parameters.Add(
"scope",
provider.Scope);
if (!string.IsNullOrWhiteSpace(provider.State))
parameters.Add(
"state",
provider.State);
var reply = request(
provider.AccessTokenUri,
payload: buildQueryString(parameters));
return interpretReply(reply);
}
/// <summary>
/// Get user info from the providers user endpoint.
/// </summary>
/// <param name="provider">OAuth2 provider wrapper.</param>
/// <param name="accessToken">Access token to use.</param>
/// <returns>Raw data from the provider.</returns>
public static string GetUserInfo(OAuth2Provider provider, string accessToken) {
var parameters = new Dictionary<string, string> {
{"access_token", accessToken}
};
return request(
provider.UserInfoUri,
"GET",
buildQueryString(parameters));
}
#endregion
#region Helper functions
/// <summary>
/// Construct a query-string from dictionary.
/// </summary>
/// <param name="parameters">Set of parameters in dictionary form to construct from.</param>
/// <returns>Query-string.</returns>
private static string buildQueryString(Dictionary<string, string> parameters) {
return parameters.Aggregate(
"",
(c, p) => c + ("&" + p.Key + "=" + HttpUtility.UrlEncode(p.Value)))
.Substring(1);
}
/// <summary>
/// Interpret the reply from the auth-call.
/// </summary>
/// <param name="reply">The string body from the web-request.</param>
/// <returns>Authentication response object.</returns>
private static OAuth2AuthenticateResponse interpretReply(string reply) {
var response = new OAuth2AuthenticateResponse();
if (reply.StartsWith("{")) { // JSON
var dict = JsonSerializer.Deserialize<Dictionary<string, object>>(reply);
if (dict.ContainsKey("access_token")) response.AccessToken = dict["access_token"].ToString();
if (dict.ContainsKey("refresh_token")) response.RefreshToken = dict["refresh_token"].ToString();
if (dict.ContainsKey("state")) response.State = dict["state"].ToString();
var seconds = 0;
if (dict.ContainsKey("expires")) int.TryParse(dict["expires"].ToString(), out seconds);
if (dict.ContainsKey("expires_in")) int.TryParse(dict["expires_in"].ToString(), out seconds);
if (seconds > 0)
response.Expires = DateTime.Now.AddSeconds(seconds);
}
else if (reply.Contains('&')) { // QueryString
var dict = reply.Split('&');
foreach (var entry in dict) {
var index = entry.IndexOf('=');
if (index == -1)
continue;
var key = entry.Substring(0, index);
var value = entry.Substring(index + 1);
switch (key) {
case "access_token":
response.AccessToken = value;
break;
case "refresh_token":
response.RefreshToken = value;
break;
case "state":
response.State = value;
break;
case "expires":
case "expires_in":
int seconds;
if (int.TryParse(value, out seconds))
response.Expires = DateTime.Now.AddSeconds(seconds);
break;
}
}
}
return response;
}
/// <summary>
/// Make a web-request and return response string.
/// </summary>
/// <param name="uri">URI to contact.</param>
/// <param name="method">HTTP method to use.</param>
/// <param name="payload">Payload to deliver via query-string or body.</param>
/// <returns>Response from web-request.</returns>
private static string request(string uri, string method = "POST", string payload = null) {
if (method == "GET" &&
!string.IsNullOrWhiteSpace(payload))
uri += "?" + payload;
var request = WebRequest.Create(uri) as HttpWebRequest;
if (request == null)
throw new WebException("Could not create WebRequest.");
request.Method = method;
request.ContentType = "application/x-www-form-urlencoded;";
request.Expect = null;
Stream stream;
if (method == "POST" &&
!string.IsNullOrWhiteSpace(payload)) {
var buffer = Encoding.UTF8.GetBytes(payload);
request.ContentLength = buffer.Length;
stream = request.GetRequestStream();
stream.Write(buffer, 0, buffer.Length);
stream.Close();
}
else {
request.ContentLength = 0;
}
var response = request.GetResponse() as HttpWebResponse;
if (response == null)
throw new WebException("Could not get response from request.");
stream = response.GetResponseStream();
if (stream == null)
throw new WebException("Could not get stream from response.");
var reader = new StreamReader(stream);
var body = reader.ReadToEnd();
reader.Close();
stream.Close();
return body;
}
#endregion
}
/// <summary>
/// OAuth2 provider wrapper.
/// </summary>
public class OAuth2Provider {
public string ClientId { get; set; }
public string ClientSecret { get; set; }
public string AuthUri { get; set; }
public string AccessTokenUri { get; set; }
public string UserInfoUri { get; set; }
public string Scope { get; set; }
public string State { get; set; }
public bool Offline = false;
}
/// <summary>
/// Authentication response object.
/// </summary>
public class OAuth2AuthenticateResponse {
public string AccessToken { get; set; }
public string RefreshToken { get; set; }
public DateTime Expires { get; set; }
public string State { get; set; }
}