An OAuth2 library for Mac OS X & iOS (Cocoa & Cocoa touch).
This library is based on draft 10 of the OAuth2 spec. It implements the native application profile and supports the end-user authorization endpoint via an internal or an external user-agent. Furthermore it also supports the user credentials flow by prompting the end-user for their username and password and use them directly to obtain an access token. See the description of the delegate for more information how to choose the authentication flow.
Getting the sources is as easy as doing a:
git clone git://github.com/nxtbgthng/OAuth2Client.git
CocoaPods is a dependency manager for Xcode projects. It manages the above installation steps automatically.
In order to install the library this way add the following line to your Podfile:
pod 'NXOAuth2Client', '~> 1.2.6'
and run the following command pod install.
Note: CocoaPods is now the preferred way to integrate NXOAuth2Client into XCode
- Place the OAuth2Client folder within your source root
- Drag the OAuth2Client.xcodeproj into your project
- Under your build target, select the Build Phases tab.
- Under Target Dependencies add OAuth2Client
- Under Link Binary With Libraries, add libOAuth2Client.a
- Under Build Settings,
- Add
$(SRCROOT)/path/to/OAuth2ClientHeader Search Paths, set as recursive - Add
-ObjCto Other Linker Flags
- Add
#import "NXOAuth2.h"- add the Security.framework as a build dependency
- drag the OAuth2Client.xcodeproj into your project
- add OAuth2Client.framework as a build dependency
- add the Security.framework as a build dependency
- add
$(CONFIGURATION_BUILD_DIR)/$(CONTENTS_FOLDER_PATH)/Frameworksto your targets Framework Search Path - link your target against OAuth2Client (drag the OAuth2Client.framework product from OAuth2Client.xcodeproj to your targets Link Binary With Libraries)
#import <OAuth2Client/NXOAuth2.h>
Using the library as a framework in desktop applications is fairly untested. Please report any issues and help in making the library better.
The best place to configure your client is +[UIApplicationDelegate initialize] on iOS or +[NSApplicationDelegate initialize] on Mac OS X. There you can call -[NXOAuth2AccountStore setClientID:secret:authorizationURL:tokenURL:redirectURL:forAccountType:] on the shared account store for each service you want to have access to from your application. The account type is a string which is used as an identifier for a certain service.
+ (void)initialize;
{
[[NXOAuth2AccountStore sharedStore] setClientID:@"xXxXxXxXxXxX"
secret:@"xXxXxXxXxXxX"
authorizationURL:[NSURL URLWithString:@"https://...your auth URL..."]
tokenURL:[NSURL URLWithString:@"https://...your token URL..."]
redirectURL:[NSURL URLWithString:@"https://...your redirect URL..."]
forAccountType:@"myFancyService"];
}
Take a look at the Wiki for some examples.
Once you have configured your client you are ready to request access to one of those services. The NXOAuth2AccountStore provides three different methods for this:
- Username and Password
[[NXOAuth2AccountStore sharedStore] requestAccessToAccountWithType:@"myFancyService" username:aUserName password:aPassword];
- External Browser
[[NXOAuth2AccountStore sharedStore] requestAccessToAccountWithType:@"myFancyService"];
If you are using an external browser, your application needs to handle the URL you have registered as an redirect URL for the account type. The service will redirect to that URL after the authentication process.
- Provide an Authorization URL Handler
[[NXOAuth2AccountStore sharedStore] requestAccessToAccountWithType:@"myFancyService"
withPreparedAuthorizationURLHandler:^(NSURL *preparedURL){
// Open a web view or similar
}];
Using an authorization URL handler gives you the ability to open the URL in an own web view or do some fancy stuff for authentication. Therefor you pass a block to the NXOAuth2AccountStore while requesting access.
After a successful authentication, a new NXOAuth2Account object is in the list of accounts of NXOAuth2AccountStore. You will receive a notification of type NXOAuth2AccountStoreAccountsDidChangeNotification, e.g., for updating your UI.
[[NSNotificationCenter defaultCenter] addObserverForName:NXOAuth2AccountStoreAccountsDidChangeNotification
object:[NXOAuth2AccountStore sharedStore]
queue:nil
usingBlock:^(NSNotification *aNotification){
// Update your UI
}];
If an account was added the userInfo dictionary of the notification will contain the new account at the NXOAuth2AccountStoreNewAccountUserInfoKey. Note though that this notification can be triggered on other events (e.g. account removal). In that case this key will not be set.
If the authentication did not succeed, a notification of type NXOAuth2AccountStoreDidFailToRequestAccessNotification containing an NSError will be send.
[[NSNotificationCenter defaultCenter] addObserverForName:NXOAuth2AccountStoreDidFailToRequestAccessNotification
object:[NXOAuth2AccountStore sharedStore]
queue:nil
usingBlock:^(NSNotification *aNotification){
NSError *error = [aNotification.userInfo objectForKey:NXOAuth2AccountStoreErrorKey];
// Do something with the error
}];
The authenticated accounts can be accessed via the NXOAuth2AccountStore. Either the complete list, only a list of accounts for a specific service or an account with an identifier (maybe cached in the user settings).
for (NXOAuth2Account *account in [[NXOAuth2AccountStore sharedStore] accounts]) {
// Do something with the account
};
for (NXOAuth2Account *account in [[NXOAuth2AccountStore sharedStore] accountsWithAccountType:@"myFancyService"]) {
// Do something with the account
};
NXOAuth2Account *account = [[NXOAuth2AccountStore sharedStore] accountWithIdentifier:@"...cached account id..."];
Each NXOAuth2Account has a property userData which can be used to store some related information for that account.
NXOAuth2Account *account = // ... get an account NSDictionary *userData = // ... account.userData = userData;
This payload will be stored together with the accounts in the Keychain. Thus it shouldn't be to big.
An request using the authentication for a service can be invoked via NXOAuth2Request. The most convenient method (see below) is a class method which you pass the method, a resource and some parameters (or nil) for the request and to handlers (both optional). One for a progress and the other for the response. The account is used for authentication and can be nil. Then a normal request without authentication will be invoked.
[NXOAuth2Request performMethod:@"GET"
onResource:[NSURL URLWithString:@"https://...your service URL..."]
usingParameters:nil
withAccount:anAccount
sendProgressHandler:^(unsigned long long bytesSend, unsigned long long bytesTotal) { // e.g., update a progress indicator }
responseHandler:^(NSURLResponse *response, NSData *responseData, NSError *error){
// Process the response
}];
In some circumstances you have to go the god old way and use an NSURLConnection. Maybe if you to download a large file. Therefor NXOAuth2Request gives you the possibility to get an NSURLRequest containing the additional information to authenticate that request.
NXOAuth2Request *theRequest = [[NXOAuth2Request alloc] initWithResource:[NSURL URLWithString:@"https://...your service URL..."]
method:@"GET"
parameters:nil];
theRequest.account = // ... an account
NSURLRequest *sigendRequest = [theRequest signedURLRequest];
[theRequest release];
// Invoke the request with you preferd method
// Get fileSize
NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:uploadFile.localDataFilePath error:nil];
NSNumber *fileSize = [fileAttributes valueForKey:NSFileSize];
// Create a stream wrapper for the upload file
NXOAuth2FileStreamWrapper* w =[NXOAuth2FileStreamWrapper
wrapperWithStream:[NSInputStream inputStreamWithFileAtPath:uploadFile.localDataFilePath]
contentLength:[fileSize unsignedLongLongValue]
fileName:uploadFile.remoteFilename];
if([uploadFile.remoteFilename hasSuffix:@".json"])
w.contentType = @"application/json";
else
if([uploadFile.remoteFilename hasSuffix:@".jpg"])
w.contentType = @"image/jpeg";
// POST Content-Disposition: form-data; name="file"; filename=uploadFile.remoteFilename
[NXOAuth2Request performMethod:@"POST" onResource:uploadFile.uploadURL usingParameters:@{@"file": w} withAccount:account
sendProgressHandler:... responseHandler: ...];
Patches and pull requests are welcome! We are sorry if it takes a while to review them, but sooner or later we will get to yours.
Not that we are using the git-flow model of branching and releasing, so please make pull requests against the develop branch to make merging them easier.
Copyright © 2012, nxtbgthng GmbH
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