Usergrid Swift SDK

Usergrid SDK written in Swift

Requirements

While the Usergrid SDK is written in Swift, the functionality remains compatible with Objective-C.

Use #import <UsergridSDK/UsergridSDK-Swift.h> in your Objective-C files to enable the use of the SDK.

• iOS 8.0+ / Mac OS X 10.11+ / tvOS 9.1+ / watchOS 2.1+
• Xcode 8.0+
• Swift 3.0+

Installation

Embedded Framework

Embedded frameworks require a minimum deployment target of iOS 8 or OS X Mavericks (10.9).

• Open up Terminal, cd into your top-level project directory, and run the following command "if" your project is not initialized as a git repository:

$ git init

• Add UsergridSDK as a git submodule by running the following command:

$ git submodule add https://github.com/apache/usergrid

• Drag the UsergridSDK.xcodeproj into the Project Navigator of your application's Xcode project.

It should appear nested underneath your application's blue project icon.

• Select the UsergridSDK.xcodeproj in the Project Navigator and verify the deployment target matches that of your application target.
• Next, select your application project in the Project Navigator (blue project icon) to navigate to the target configuration window and select the application target under the "Targets" heading in the sidebar.
• In the tab bar at the top of that window, open the "General" panel.
• Click on the + button under the "Embedded Binaries" section.
• Select the UsergridSDK.framework.

The UsergridSDK.framework is automatically added as a target dependency, linked framework and embedded framework in a copy files build phase which is all you need to build on the simulator and a device.

Documentation

The documentation for this library is available here.

Initialization

There are two different ways of initializing the Usergrid Swift SDK:

1. The singleton pattern is both convenient and enables the developer to use a globally available and always-initialized instance of Usergrid.

Usergrid.initSharedInstance(orgId: "orgId", appId: "appId")

1. The Instance pattern enables the developer to manage instances of the Usergrid client independently and in an isolated fashion. The primary use-case for this is when an application connects to multiple Usergrid targets.

let client = UsergridClient(orgId: "orgId", appId: "appId")

Note: Examples in this readme assume you are using the Usergrid shared instance. If you've implemented the instance pattern instead, simply replace Usergrid with your client instance variable.

Push Notifications

Note: You must have an Apple Developer account along with valid provisioning profiles set in order to receive push notifications.

In order to utilize Usergrid push notifications, you must register the device with an Usergrid push notifier identifier.

For a more thorough example of recieving push notifications and sending push notifications (from the device) refer to the Push sample app located in the /Samples folder.

The following code snippet shows how you would register for push notifications and apply the push token within the application delegate.

import UsergridSDK

@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        // Initialize the shared instance of Usergrid.
        Usergrid.initSharedInstance(orgId:"orgId", appId: "appId")

        // Register for APN
        application.registerUserNotificationSettings(UIUserNotificationSettings( forTypes: [.Alert, .Badge, .Sound], categories: nil))
        application.registerForRemoteNotifications()

        return true
    }

    func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
        Usergrid.applyPushToken(deviceToken, notifierID: "notifierId") { response in
            // The push notification is now added to Usergrid for this device and this device will now be able to recieve notifications.
        }
    }
}

RESTful operations

When making any RESTful call, a type parameter (or path) is always required. Whether you specify this as an argument or in an object as a parameter is up to you.

GET

• To get entities in a collection:

Usergrid.GET("collection") { response in
    var entities: [UsergridEntity]? = response.entities
}

• To get a specific entity in a collection by uuid or name:

Usergrid.GET("collection", uuidOrName:"<uuid-or-name>") { response in
    var entity: UsergridEntity? = response.entity?
}

• To get specific entities in a collection by passing a UsergridQuery object:

var query = UsergridQuery("cats").gt("weight", value: 2.4)
                                 .contains("color", value:"bl*")
                                 .not()
                                 .eq("color", value:"blue")
                                 .or()
                                 .eq("color", value:"orange")

// this will build out the following query:
// select * where weight > 2.4 and color contains 'bl*' and not color = 'blue' or color = 'orange'

Usergrid.GET(query) { response in
    var entities: [UsergridEntity]? = response.entities
}

POST and PUT

POST and PUT requests both require a JSON body payload. You can pass either a Swift object or a UsergridEntity instance. While the former works in principle, best practise is to use a UsergridEntity wherever practical. When an entity has a uuid or name property and already exists on the server, use a PUT request to update it. If it does not, use POST to create it.

• To create a new entity in a collection (POST):

var entity = UsergridEntity(type: "restaurant", propertyDict: ["restaurant": "Dino's Deep Dish","cuisine": "pizza"])

Usergrid.POST(entity) { response in
    // entity should now have a uuid property and be created
}

// you can also POST an array of entities:

var entities = [UsergridEntity(type: "restaurant", propertyDict:["restaurant": "Dino's Deep Dish","cuisine": "pizza"]), 
                UsergridEntity(type: "restaurant", propertyDict:["restaurant": "Pizza da Napoli","cuisine": "pizza"])]

Usergrid.POST(entities) { response in
    // response.entities should now contain now valid posted entities.
}

• To update an entity in a collection (PUT):

var entity = UsergridEntity(type: "restaurant", propertyDict:["restaurant": "Dino's Deep Dish", "cuisine": "pizza"])

Usergrid.POST(entity) { response in
    if let responseEntity = response.entity {
        responseEntity["owner"] = "Mia Carrara"
        Usergrid.PUT(responseEntity) { (response) -> Void in
            // entity now has the property 'owner'
        }
    }
}

// or update a set of entities by passing a UsergridQuery object

var query = UsergridQuery("restaurants").eq("cuisine", value:"italian")

Usergrid.PUT(query, jsonBody: ["keywords":["pasta"]]) { response in

    /* the first 10 entities matching this query criteria will be updated:
    e.g.:
        [
            {
                "type": "restaurant",
                "restaurant": "Il Tarazzo",
                "cuisine": "italian",
                "keywords": ["pasta"]
            },
            {
                "type": "restaurant",
                "restaurant": "Cono Sur Pizza & Pasta",
                "cuisine": "italian",
                "keywords": ["pasta"]
            }
        ]
    */
}

DELETE

DELETE requests require either a specific entity or a UsergridQuery object to be passed as an argument.

• To delete a specific entity in a collection by uuid or name:

Usergrid.DELETE("collection", uuidOrName: "<uuid-or-name>") { response in
    // if successful, entity will now be deleted
})

• To specific entities in a collection to delete by passing a UsergridQuery object:

let query = UsergridQuery("cats").eq("color", value:"black")
                                 .or()
                                 .eq("color", value:"white")

// this will build out the following query:
// select * where color = 'black' or color = 'white'

Usergrid.DELETE(query) { response in
    // the first 10 entities matching this query criteria will be deleted
}

Entity operations and convenience methods

UsergridEntity has a number of helper/convenience methods to make working with entities more convenient.

reload()

Reloads the entity from the server:

entity.reload() { response in
    // entity is now reloaded from the server
}

save()

Saves (or creates) the entity on the server:

entity["aNewProperty"] = "A new value"
entity.save() { response in
    // entity is now updated on the server
}

remove()

Deletes the entity from the server:

entity.remove() { response in
    // entity is now deleted on the server and the local instance should be destroyed
}

Authentication, current user, and authMode

appAuth and authenticateApp()

Usergrid can use the app client ID and secret that were passed upon initialization and automatically retrieve an app-level token for these credentials.

Usergrid.setAppAuth("<client-id>", "<client-secret>")
Usergrid.authenticateApp() { response in
    // Usergrid.appAuth is authenticated automatically when this call is successful
}

currentUser, userAuth, and authenticateUser()

Usergrid has a special currentUser property.

The current user is stored within the keychain so app relaunches will persist the user's login and token information. To adjust this feature edit the Usergrid.persistCurrentUserInKeychain property upon initialization.

By default, when calling authenticateUser(), .currentUser will be set to this user if the authentication flow is successful.

let userAuth = UsergridUserAuth(username: "<username>", password: "<password>")
Usergrid.authenticateUser(userAuth) { auth, user, error in
    // Usergrid.currentUser is set to the authenticated user and the token is stored within that context
}

If you want to utilize authenticateUser without setting as the current user, simply pass a false boolean value as the second parameter:

let userAuth = UsergridUserAuth(username: "<username>", password: "<password>")
Usergrid.authenticateUser(userAuth,setAsCurrentUser: false) { auth, user, error in
    // user is authenticated but Usergrid.currentUser is not set.
}

authMode

Auth-mode is used to determine what the UsergridClient will use for authorization.

By default, Usergrid.authMode is set to .User, whereby if a non-expired UsergridUserAuth exists in UsergridClient.currentUser, this token is used to authenticate all API calls.

If instead Usergrid.authMode is set to .None, all API calls will be performed unauthenticated.

If instead Usergrid.authMode is set to .App, all API calls will be performed using the client credentials token, if they're available (i.e. authenticateApp() was performed at some point).

usingAuth()

At times it is desireable to have complete, granular control over the authentication context of an API call.

To facilitate this, the passthrough function .usingAuth() allows you to pre-define the auth context of the next API call.

// assume Usergrid.authMode = .None

Usergrid.usingAuth(Usergrid.appAuth!).POST("roles/guest/permissions", jsonBody: ["permission" : "get,post,put,delete:/**"] ) { response in
    // here we've temporarily used the client credentials to modify permissions
    // subsequent calls will not use this auth context
}

User operations and convenience methods

UsergridUser has a number of helper/convenience methods to make working with user entities more convenient. If you are not utilizing the Usergrid shared instance, you must pass an instance of UsergridClient as the first argument to any of these helper methods.

create()

Creating a new user:

let user = UsergridUser(username: "username", password: "password")
user.create() { response in
    // user has now been created and should have a valid uuid
}

login()

A simpler means of retrieving a user-level token:

user.login("username", password: "password") { auth, user, error in
    // user is now logged in
}

logout()

Logs out the selected user. You can also use this convenience method on Usergrid.currentUser.

user.logout() { response in
    // user is now logged out
}

resetPassword()

Resets the password for the selected user.

user.resetPassword("oldPassword", new: "newPassword") { error, didSucceed in
    // if it was done correctly, the new password will be changed
    // 'didSucceed' is a boolean value that indicates whether it was changed successfully
}

UsergridUser.CheckAvailable()

This is a class (static) method that allows you to check whether a username or email address is available or not.

UsergridUser.checkAvailable("email", username: nil) { error, available in
    // 'available' == whether an email already exists for a user
}

UsergridUser.checkAvailable(nil, username: "username") { error, available in
    // 'available' == whether an username already exists for a user
}

UsergridUser.checkAvailable("email", username: "username") { error, available in
    // 'available' == whether an email or username already exist for a user
}

Querying and filtering data

UsergridQuery initialization

The UsergridQuery class allows you to build out complex query filters using the Usergrid query syntax.

The first parameter of the UsergridQuery builder pattern should be the collection (or type) you intend to query. You can either pass this as an argument, or as the first builder object:

var query = UsergridQuery("cats")
// or
var query = UsergridQuery().collection("cats")

You then can layer on additional queries:

var query = UsergridQuery("cats").gt("weight", value: 2.4)
                                 .contains("color", value: "bl*")
                                 .not()
                                 .eq("color", value:"white")
                                 .or()
                                 .eq("color", value:"orange")

You can also adjust the number of results returned:

var query = UsergridQuery("cats").eq("color", value: "black")
                                 .limit(100)

// returns a maximum of 100 entiteis

And sort the results:

var query = UsergridQuery("cats").eq("color", value: "black")
                                 .limit(100)
                                 .asc("name")

// sorts by 'name', ascending

And you can do geo-location queries:

var query = UsergridQuery("devices").locationWithin(<distance>, latitude: <lat>, longitude: <long>)

Using a query in a request

Queries can be passed as parameters to GET, PUT, and DELETE requests:

Usergrid.GET("type", query: query) { response in
    // Gets entities of a given type matching the query.
}

Usergrid.PUT(query, jsonBody: ["aNewProperty":"A new value"]) { response in
    // Updates the entities matching the query with the new property.
}

Usergrid.DELETE(query) { response in
    // Deletes entities of a given type matching the query.
}

List of query builder objects

type("string")

The collection name to query

collection("string")

An alias for type

eq("key", value: "value") or equals("key", value: "value") or filter("key", value: "value")

Equal to (e.g. where color = 'black')

contains("key", value: "value") or containsString("key", value: "value") or containsWord("key", value: "value")

Contains a string (e.g.where color contains 'bl*')

gt("key", value: "value") or greaterThan("key", value: "value")

Greater than (e.g. where weight > 2.4)

gte("key", value: "value") or greaterThanOrEqual("key", value: "value")

Greater than or equal to (e.g. where weight >= 2.4)

lt("key", value: "value") or lessThan("key", value: "value")

Less than (e.g. where weight < 2.4)

lte("key", value: "value") or lessThanOrEqual("key", value: "value")

Less than or equal to (e.g. where weight <= 2.4)

not()

Negates the next block in the builder pattern, e.g.:

var query = UsergridQuery("cats").not().eq("color", value: "black")
// select * from cats where not color = 'black'

and()

Joins two queries by requiring both of them. and is also implied when joining two queries without an operator. E.g.:

var query = UsergridQuery("cats").eq("color", value:"black").eq("fur", value:"longHair")
// is identical to:
var query = UsergridQuery("cats").eq("color", value:"black").and().eq("fur", value:"longHair")  

or()

Joins two queries by requiring only one of them. or is never implied. e.g.:

var query = UsergridQuery("cats").eq("color",value: "black").or().eq("color", value: "white")

When using or() and and() operators, and() joins will take precedence over or() joins. You can read more about query operators and precedence here.

locationWithin(distanceInMeters, latitude: latitude, longitude: longitude)

Returns entities which have a location within the specified radius. Arguments can be float or int.

asc("key") or ascending("key")

Sorts the results by the specified property, ascending

desc("key") or descending("key")

Sorts the results by the specified property, descending

sort("key", value: .Asc)

Sorts the results by the specified property, in the specified UsergridQuerySortOrder (.Asc or .Desc).

limit(int)

The maximum number of entities to return

cursor("string")

A pagination cursor string

fromString("query string")

A special builder property that allows you to input a pre-defined query string. All builder properties will be ignored when this property is defined. For example:

var query = UsergridQuery().fromString("select * where color = 'black' order by name asc")

UsergridResponse object

UsergridResponse is the core class that handles both successful and unsuccessful HTTP responses from Usergrid.

If a request is successful, any entities returned in the response will be automatically parsed into UsergridEntity objects and pushed to the entities property.

If a request fails, the error property will contain information about the problem encountered.

ok

You can check UsergridResponse.ok, a Bool value, to see if the response was successful. Any status code < 400 returns true.

Usergrid.GET("collection") { response in
    if response.ok {
        // woo!
    }
}

entity, entities, user, users, first, last

Depending on the call you make, any entities returned in the response will be automatically parsed into UsergridEntity objects and pushed to the entities property. If you're querying the users collection, these will also be UsergridUser objects, a subclass of UsergridEntity.

• .first returns the first entity in an array of entities; .entity is an alias to .first. If there are no entities, both of these will be undefined.

• .last returns the last entity in an array of entities; if there is only one entity in the array, this will be the same as .first and .entity, and will be undefined if there are no entities in the response.

• .entities will either be an array of entities in the response, or an empty array.

• .user is a special alias for .entity for when querying the users collection. Instead of being a UsergridEntity, it will be its subclass, UsergridUser.

• .users is the same as .user, though behaves as .entities does by returning either an array of UsergridUser objects or an empty array.

Examples:

Usergrid.GET("collection") { response in
    // you can access:
    //     response.entities (the returned entities)
    //     response.first (the first entity)
    //     response.entity (same as response.first)
    //     response.last (the last entity returned)
}

Usergrid.GET("collection", uuidOrName:"<uuid-or-name>") { response in
    // you can access:
    //     response.entity (the returned entity) 
    //     response.entities (containing only the returned entity)
    //     response.first (same as response.entity)
    //     response.last (same as response.entity)
}

Usergrid.GET("users") { response in
    // you can access:
    //     response.users (the returned users)
    //     response.entities (same as response.users)
    //     response.user (the first user)    
    //     response.entity (same as response.user)   
    //     response.first (same as response.user)  
    //     response.last (the last user)
}

Usergrid.GET("users", uuidOrName:"<uuid-or-name>") { response in
    // you can access;
    //     response.users (containing only the one user)
    //     response.entities (same as response.users)
    //     response.user (the returned user)    
    //     response.entity (same as response.user)   
    //     response.first (same as response.user)  
    //     response.last (same as response.user)  
}

Connections

Connections can be managed using Usergrid.connect(), Usergrid.disconnect(), and Usergrid.getConnections(), or entity convenience methods of the same name.

When retrieving connections via Usergrid.getConnections(), you can pass in a optional UsergridQuery object in order to filter the connectioned entities returned.

Connect

Create a connection between two entities:

Usergrid.connect(entity1, relationship: "relationship", to: entity2) { response in
    // entity1 now has an outbound connection to entity2
}

Retrieve Connections

Retrieve outbound connections:

Usergrid.getConnections(.Out, entity: entity1, relationship: "relationship", query: nil) { response in
    // entities is an array of entities that entity1 is connected to via 'relationship'
    // in this case, we'll see entity2 in the array
}

Retrieve inbound connections:

Usergrid.getConnections(.In, entity: entity2, relationship: "relationship", query: nil) { response in
    // entities is an array of entities that connect to entity2 via 'relationship'
    // in this case, we'll see entity1 in the array
}

Disconnect

Delete a connection between two entities:

Usergrid.disconnect(entity1, relationship: "relationship", from: entity2) { response in
    // entity1's outbound connection to entity2 has been destroyed
}

Assets

Assets can be uploaded and downloaded either directly using Usergrid.uploadAsset() or Usergrid.downloadAsset(), or via UsergridEntity convenience methods with the same names. Before uploading an asset, you will need to initialize a UsergridAsset instance.

Initialization

Note: When initializing a UsergridAsset object specifying a file name is optional.

• Using NSData:

let image = UIImage(contentsOfFile: "path/to/image")
let data = UIImagePNGRepresentation(image)
let asset = UsergridAsset(fileName:"<file-name-or-nil>", data: data!, contentType:"image/png")

• Using an UIImage object:

let image = UIImage(contentsOfFile: "path/to/image")
let asset = UsergridAsset(fileName:"<file-name-or-nil>", image: image!, imageContentType: .Png)

• Using a file URL:

let fileUrl = NSURL(string: "local/path/to/file")
if fileUrl.isFileReferenceURL() {  // This must be a file reference url.
    let asset = UsergridAsset(fileName:"<file-name-or-nil>", fileUrl: fileUrl!, contentType:"<content-type>")
}

Uploading

Upload an image and connect it to an entity:

let image = UIImage(contentsOfFile: "path/to/image")
let asset = UsergridAsset(fileName:"<file-name-or-nil>", image: image!, imageContentType: .Png)!
Usergrid.uploadAsset(entity,
                     asset: asset,
                     progress: { bytesFinished, bytesExpected in
                        // Monitor the upload progress
                     },
                     completion: { asset, response in
                        // The asset is now uploaded to Usergrid and entity.asset == asset
})

Downloading

Download an image which is connected to an entity:

Usergrid.downloadAsset(entity,
                       contentType: "<expected-content-type>",
                       progress: { bytesFinished, bytesExpected in
                            // Monitor the download progress
                       },
                       completion:{ asset, error in
                            // The asset is now downloaded from Usergrid and entity.asset == asset
})

Custom UsergridEntity Subclasses

Creating custom subclasses of the base UsergridEntity class (just like UsergridUser and UsergridDevice) is possible.

For a working example of creating a custom subclass refer to the ActivityFeed sample app located in the /Samples folder. The custom subclass there is named ActivityEntity.

• To do so, subclass UsergridEntity and implement the required methods:

import UsergridSDK

public class ActivityEntity: UsergridEntity {

    required public init(type: String, name: String?, propertyDict: [String : AnyObject]?) {
        super.init(type: type, name: name, propertyDict: propertyDict)
    }

    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}

• You will also need to register the custom subclass:

Usergrid.initSharedInstance(orgId: "orgId", appId: "appId")
UsergridEntity.mapCustomType("activity", toSubclass: ActivityEntity.self)

By registering your custom subclass, the UsergridEntity and UsergridResponse classes are able to generate instances of these classes based on the an entities type.

In the above example, entities which have a type value of activity can now be cast as ActivityEntity objects. e.g.:

Usergrid.GET("activity") { response in
    var activityEntities: [ActivityEntity]? = response.entities as? [ActivityEntity]
}