Dropbox OAuth 2 Tutorial?

sacad

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Is there maybe anyone who did a dropbox using Oauth 2 app? Erel example is only on 1 and i figured out that you have to do it like Erel O auth 2 tutorial but im not very good in C# coding and i found this C# program and need a way to convert into the google service app example (http://www.b4x.com/forum/basic4andr...7-oauth-2-0-google-web-services-tutorial.html). here is the C# code for dropbox. I apologize for the code not being in tags. What i want to do is the same example as this(http://www.b4x.com/forum/basic4andr...als/10767-android-dropbox-oauth-tutorial.html) but for Oauth 2

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OAuth;
using System.Web;
using System.Net;
using System.IO;
using System.Diagnostics;
using System.Threading;

namespace ConsoleApplication
{
class Program
{
private const string consumerKey = "";
private const string consumerSecret = "";

private class OAuthToken
{
public OAuthToken(string token, string secret)
{
Token = token;
Secret = secret;
}

public string Token { get; private set; }

public string Secret { get; private set; }
}

private static OAuthToken GetRequestToken()
{
var uri = new Uri("https://api.dropbox.com/1/oauth/request_token");

// Generate a signature
OAuthBase oAuth = new OAuthBase();
string nonce = oAuth.GenerateNonce();
string timeStamp = oAuth.GenerateTimeStamp();
string parameters;
string normalizedUrl;
string signature = oAuth.GenerateSignature(uri, consumerKey, consumerSecret,
String.Empty, String.Empty, "GET", timeStamp, nonce, OAuthBase.SignatureTypes.HMACSHA1,
out normalizedUrl, out parameters);

signature = HttpUtility.UrlEncode(signature);

StringBuilder requestUri = new StringBuilder(uri.ToString());
requestUri.AppendFormat("?oauth_consumer_key={0}&", consumerKey);
requestUri.AppendFormat("oauth_nonce={0}&", nonce);
requestUri.AppendFormat("oauth_timestamp={0}&", timeStamp);
requestUri.AppendFormat("oauth_signature_method={0}&", "HMAC-SHA1");
requestUri.AppendFormat("oauth_version={0}&", "1.0");
requestUri.AppendFormat("oauth_signature={0}", signature);

var request = (HttpWebRequest)WebRequest.Create(new Uri(requestUri.ToString()));
request.Method = WebRequestMethods.Http.Get;

var response = request.GetResponse();

var queryString = new StreamReader(response.GetResponseStream()).ReadToEnd();

var parts = queryString.Split('&');
var token = parts[1].Substring(parts[1].IndexOf('=') + 1);
var secret = parts[0].Substring(parts[0].IndexOf('=') + 1);

return new OAuthToken(token, secret);
}

private static OAuthToken GetAccessToken(OAuthToken oauthToken)
{
var uri = "https://api.dropbox.com/1/oauth/access_token";

OAuthBase oAuth = new OAuthBase();

var nonce = oAuth.GenerateNonce();
var timeStamp = oAuth.GenerateTimeStamp();
string parameters;
string normalizedUrl;
var signature = oAuth.GenerateSignature(new Uri(uri), consumerKey, consumerSecret,
oauthToken.Token, oauthToken.Secret, "GET", timeStamp, nonce,
OAuthBase.SignatureTypes.HMACSHA1, out normalizedUrl, out parameters);

signature = HttpUtility.UrlEncode(signature);

var requestUri = new StringBuilder(uri);
requestUri.AppendFormat("?oauth_consumer_key={0}&", consumerKey);
requestUri.AppendFormat("oauth_token={0}&", oauthToken.Token);
requestUri.AppendFormat("oauth_nonce={0}&", nonce);
requestUri.AppendFormat("oauth_timestamp={0}&", timeStamp);
requestUri.AppendFormat("oauth_signature_method={0}&", "HMAC-SHA1");
requestUri.AppendFormat("oauth_version={0}&", "1.0");
requestUri.AppendFormat("oauth_signature={0}", signature);

var request = (HttpWebRequest) WebRequest.Create(requestUri.ToString());
request.Method = WebRequestMethods.Http.Get;

var response = request.GetResponse();
var reader = new StreamReader(response.GetResponseStream());
var accessToken = reader.ReadToEnd();

var parts = accessToken.Split('&');
var token = parts[1].Substring(parts[1].IndexOf('=') + 1);
var secret = parts[0].Substring(parts[0].IndexOf('=') + 1);

return new OAuthToken(token, secret);
}

static void Main(string[] args)
{
// Step 1/3: Get request token
OAuthToken oauthToken = GetRequestToken();

// Step 2/3: Authorize application
var queryString = String.Format("oauth_token={0}", oauthToken.Token);
var authorizeUrl = "https://www.dropbox.com/1/oauth/authorize?" + queryString;
Process.Start(authorizeUrl);
Thread.Sleep(5000); // Leave some time for the authorization step to complete

// Step 3/3: Get access token
OAuthToken accessToken = GetAccessToken(oauthToken);

Console.WriteLine(String.Format("Your access token: {0}", accessToken.Token));
Console.WriteLine(String.Format("Your access secret: {0}", accessToken.Secret));

Console.WriteLine();
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
}
}
}




OAuthbase.cs


using System;
using System.Security.Cryptography;
using System.Collections.Generic;
using System.Text;
using System.Web;

namespace OAuth {
public class OAuthBase {

/// <summary>
/// Provides a predefined set of algorithms that are supported officially by the protocol
/// </summary>
public enum SignatureTypes {
HMACSHA1,
PLAINTEXT,
RSASHA1
}

/// <summary>
/// Provides an internal structure to sort the query parameter
/// </summary>
protected class QueryParameter {
private string name = null;
private string value = null;

public QueryParameter(string name, string value) {
this.name = name;
this.value = value;
}

public string Name {
get { return name; }
}

public string Value {
get { return value; }
}
}

/// <summary>
/// Comparer class used to perform the sorting of the query parameters
/// </summary>
protected class QueryParameterComparer : IComparer<QueryParameter> {

#region IComparer<QueryParameter> Members

public int Compare(QueryParameter x, QueryParameter y) {
if (x.Name == y.Name) {
return string.Compare(x.Value, y.Value);
} else {
return string.Compare(x.Name, y.Name);
}
}

#endregion
}

protected const string OAuthVersion = "1.0";
protected const string OAuthParameterPrefix = "oauth_";

//
// List of know and used oauth parameters' names
//
protected const string OAuthConsumerKeyKey = "oauth_consumer_key";
protected const string OAuthCallbackKey = "oauth_callback";
protected const string OAuthVersionKey = "oauth_version";
protected const string OAuthSignatureMethodKey = "oauth_signature_method";
protected const string OAuthSignatureKey = "oauth_signature";
protected const string OAuthTimestampKey = "oauth_timestamp";
protected const string OAuthNonceKey = "oauth_nonce";
protected const string OAuthTokenKey = "oauth_token";
protected const string OAuthTokenSecretKey = "oauth_token_secret";

protected const string HMACSHA1SignatureType = "HMAC-SHA1";
protected const string PlainTextSignatureType = "PLAINTEXT";
protected const string RSASHA1SignatureType = "RSA-SHA1";

protected Random random = new Random();

protected string unreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";

/// <summary>
/// Helper function to compute a hash value
/// </summary>
/// <param name="hashAlgorithm">The hashing algoirhtm used. If that algorithm needs some initialization, like HMAC and its derivatives, they should be initialized prior to passing it to this function</param>
/// <param name="data">The data to hash</param>
/// <returns>a Base64 string of the hash value</returns>
private string ComputeHash(HashAlgorithm hashAlgorithm, string data) {
if (hashAlgorithm == null) {
throw new ArgumentNullException("hashAlgorithm");
}

if (string.IsNullOrEmpty(data)) {
throw new ArgumentNullException("data");
}

byte[] dataBuffer = System.Text.Encoding.ASCII.GetBytes(data);
byte[] hashBytes = hashAlgorithm.ComputeHash(dataBuffer);

return Convert.ToBase64String(hashBytes);
}

/// <summary>
/// Internal function to cut out all non oauth query string parameters (all parameters not begining with "oauth_")
/// </summary>
/// <param name="parameters">The query string part of the Url</param>
/// <returns>A list of QueryParameter each containing the parameter name and value</returns>
private List<QueryParameter> GetQueryParameters(string parameters) {
if (parameters.StartsWith("?")) {
parameters = parameters.Remove(0, 1);
}

List<QueryParameter> result = new List<QueryParameter>();

if (!string.IsNullOrEmpty(parameters)) {
string[] p = parameters.Split('&');
foreach (string s in p) {
if (!string.IsNullOrEmpty(s) && !s.StartsWith(OAuthParameterPrefix)) {
if (s.IndexOf('=') > -1) {
string[] temp = s.Split('=');
result.Add(new QueryParameter(temp[0], temp[1]));
} else {
result.Add(new QueryParameter(s, string.Empty));
}
}
}
}

return result;
}

/// <summary>
/// This is a different Url Encode implementation since the default .NET one outputs the percent encoding in lower case.
/// While this is not a problem with the percent encoding spec, it is used in upper case throughout OAuth
/// </summary>
/// <param name="value">The value to Url encode</param>
/// <returns>Returns a Url encoded string</returns>
protected string UrlEncode(string value) {
StringBuilder result = new StringBuilder();

foreach (char symbol in value) {
if (unreservedChars.IndexOf(symbol) != -1) {
result.Append(symbol);
} else {
result.Append('%' + String.Format("{0:X2}", (int)symbol));
}
}

return result.ToString();
}

/// <summary>
/// Normalizes the request parameters according to the spec
/// </summary>
/// <param name="parameters">The list of parameters already sorted</param>
/// <returns>a string representing the normalized parameters</returns>
protected string NormalizeRequestParameters(IList<QueryParameter> parameters) {
StringBuilder sb = new StringBuilder();
QueryParameter p = null;
for (int i = 0; i < parameters.Count; i++) {
p = parameters;
sb.AppendFormat("{0}={1}", p.Name, p.Value);

if (i < parameters.Count - 1) {
sb.Append("&");
}
}

return sb.ToString();
}

/// <summary>
/// Generate the signature base that is used to produce the signature
/// </summary>
/// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
/// <param name="consumerKey">The consumer key</param>
/// <param name="token">The token, if available. If not available pass null or an empty string</param>
/// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
/// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
/// <param name="signatureType">The signature type. To use the default values use <see cref="OAuthBase.SignatureTypes">OAuthBase.SignatureTypes</see>.</param>
/// <returns>The signature base</returns>
public string GenerateSignatureBase(Uri url, string consumerKey, string token, string tokenSecret, string httpMethod, string timeStamp, string nonce, string signatureType, out string normalizedUrl, out string normalizedRequestParameters) {
if (token == null) {
token = string.Empty;
}

if (tokenSecret == null) {
tokenSecret = string.Empty;
}

if (string.IsNullOrEmpty(consumerKey)) {
throw new ArgumentNullException("consumerKey");
}

if (string.IsNullOrEmpty(httpMethod)) {
throw new ArgumentNullException("httpMethod");
}

if (string.IsNullOrEmpty(signatureType)) {
throw new ArgumentNullException("signatureType");
}

normalizedUrl = null;
normalizedRequestParameters = null;

List<QueryParameter> parameters = GetQueryParameters(url.Query);
parameters.Add(new QueryParameter(OAuthVersionKey, OAuthVersion));
parameters.Add(new QueryParameter(OAuthNonceKey, nonce));
parameters.Add(new QueryParameter(OAuthTimestampKey, timeStamp));
parameters.Add(new QueryParameter(OAuthSignatureMethodKey, signatureType));
parameters.Add(new QueryParameter(OAuthConsumerKeyKey, consumerKey));

if (!string.IsNullOrEmpty(token)) {
parameters.Add(new QueryParameter(OAuthTokenKey, token));
}

parameters.Sort(new QueryParameterComparer());

normalizedUrl = string.Format("{0}://{1}", url.Scheme, url.Host);
if (!((url.Scheme == "http" && url.Port == 80) || (url.Scheme == "https" && url.Port == 443)))
{
normalizedUrl += ":" + url.Port;
}
normalizedUrl += url.AbsolutePath;
normalizedRequestParameters = NormalizeRequestParameters(parameters);

StringBuilder signatureBase = new StringBuilder();
signatureBase.AppendFormat("{0}&", httpMethod.ToUpper());
signatureBase.AppendFormat("{0}&", UrlEncode(normalizedUrl));
signatureBase.AppendFormat("{0}", UrlEncode(normalizedRequestParameters));

return signatureBase.ToString();
}

/// <summary>
/// Generate the signature value based on the given signature base and hash algorithm
/// </summary>
/// <param name="signatureBase">The signature based as produced by the GenerateSignatureBase method or by any other means</param>
/// <param name="hash">The hash algorithm used to perform the hashing. If the hashing algorithm requires initialization or a key it should be set prior to calling this method</param>
/// <returns>A base64 string of the hash value</returns>
public string GenerateSignatureUsingHash(string signatureBase, HashAlgorithm hash) {
return ComputeHash(hash, signatureBase);
}

/// <summary>
/// Generates a signature using the HMAC-SHA1 algorithm
/// </summary>
/// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
/// <param name="consumerKey">The consumer key</param>
/// <param name="consumerSecret">The consumer seceret</param>
/// <param name="token">The token, if available. If not available pass null or an empty string</param>
/// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
/// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
/// <returns>A base64 string of the hash value</returns>
public string GenerateSignature(Uri url, string consumerKey, string consumerSecret, string token, string tokenSecret, string httpMethod, string timeStamp, string nonce, out string normalizedUrl, out string normalizedRequestParameters) {
return GenerateSignature(url, consumerKey, consumerSecret, token, tokenSecret, httpMethod, timeStamp, nonce, SignatureTypes.HMACSHA1, out normalizedUrl, out normalizedRequestParameters);
}

/// <summary>
/// Generates a signature using the specified signatureType
/// </summary>
/// <param name="url">The full url that needs to be signed including its non OAuth url parameters</param>
/// <param name="consumerKey">The consumer key</param>
/// <param name="consumerSecret">The consumer seceret</param>
/// <param name="token">The token, if available. If not available pass null or an empty string</param>
/// <param name="tokenSecret">The token secret, if available. If not available pass null or an empty string</param>
/// <param name="httpMethod">The http method used. Must be a valid HTTP method verb (POST,GET,PUT, etc)</param>
/// <param name="signatureType">The type of signature to use</param>
/// <returns>A base64 string of the hash value</returns>
public string GenerateSignature(Uri url, string consumerKey, string consumerSecret, string token, string tokenSecret, string httpMethod, string timeStamp, string nonce, SignatureTypes signatureType, out string normalizedUrl, out string normalizedRequestParameters) {
normalizedUrl = null;
normalizedRequestParameters = null;

switch (signatureType) {
case SignatureTypes.PLAINTEXT:
return HttpUtility.UrlEncode(string.Format("{0}&{1}", consumerSecret, tokenSecret));
case SignatureTypes.HMACSHA1:
string signatureBase = GenerateSignatureBase(url, consumerKey, token, tokenSecret, httpMethod, timeStamp, nonce, HMACSHA1SignatureType, out normalizedUrl, out normalizedRequestParameters);

HMACSHA1 hmacsha1 = new HMACSHA1();
hmacsha1.Key = Encoding.ASCII.GetBytes(string.Format("{0}&{1}", UrlEncode(consumerSecret), string.IsNullOrEmpty(tokenSecret) ? "" : UrlEncode(tokenSecret)));

return GenerateSignatureUsingHash(signatureBase, hmacsha1);
case SignatureTypes.RSASHA1:
throw new NotImplementedException();
default:
throw new ArgumentException("Unknown signature type", "signatureType");
}
}

/// <summary>
/// Generate the timestamp for the signature
/// </summary>
/// <returns></returns>
public virtual string GenerateTimeStamp() {
// Default implementation of UNIX time of the current UTC time
TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
return Convert.ToInt64(ts.TotalSeconds).ToString();
}

/// <summary>
/// Generate a nonce
/// </summary>
/// <returns></returns>
public virtual string GenerateNonce() {
// Just a simple implementation of a random number between 123400 and 9999999
return random.Next(123400, 9999999).ToString();
}

}
}
 
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