Clean up of view, passing back scopes, add icon

FitKit/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -31,13 +31,15 @@
       "scale" : "3x"
     },
     {
-      "idiom" : "iphone",
       "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "icon-120.png",
       "scale" : "2x"
     },
     {
-      "idiom" : "iphone",
       "size" : "60x60",
+      "idiom" : "iphone",
+      "filename" : "icon-180.png",
       "scale" : "3x"
     },
     {

FitKit/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

FitKit/Base.lproj/Main.storyboard

@@ -27,14 +27,14 @@
                             </navigationBar>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Logged In" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="CoH-cd-flw">
                                 <rect key="frame" x="38" y="99" width="298" height="45"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="37"/>
                                 <nil key="textColor"/>
                                 <nil key="highlightedColor"/>
                             </label>
                             <textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" fixedFrame="YES" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="IdY-jU-MBP">
-                                <rect key="frame" x="16" y="152" width="343" height="495"/>
-                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <rect key="frame" x="16" y="152" width="343" height="305"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMinX="YES" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                 <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
@@ -44,7 +44,7 @@
                         <accessibility key="accessibilityConfiguration">
                             <accessibilityTraits key="traits" notEnabled="YES"/>
                         </accessibility>
-                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                        <viewLayoutGuide key="safeArea" id="OGN-ry-fYp"/>
                     </view>
                     <connections>
                         <outlet property="loggedIn" destination="CoH-cd-flw" id="SUh-wA-KNF"/>

FitKit/FitbitClient.swift

@@ -15,6 +15,7 @@ import OAuthSwiftAlamofire
 class FitbitClient {
     private enum FitKitRequestError: Error {
         case unableToParseResults
+        case invalidAuthorization
     }
 
     private var oauthClient: OAuth2Swift
@@ -24,6 +25,7 @@ class FitbitClient {
     private let authorizeUrl = "https://www.fitbit.com/oauth2/authorize"
     private let accessTokenUrl = "https://api.fitbit.com/oauth2/token"
     private var keychainWrapper: KeychainWrapper
+    private let keychainCredKey = "credential"
     
     init() {
         // Init inner client
@@ -44,10 +46,11 @@ class FitbitClient {
         self.keychainWrapper = KeychainWrapper.standard
 
         // Attempt to load tokens
-        self.loadStoredTokens()
+        self.maybeLoadStoredCredential()
     }
     
-    func loadStoredTokens() {
+    /// Attempts to load and use stored credentials
+    func maybeLoadStoredCredential() {
         if let credential = self.readCredential() {
             NSLog("Using credential from Keychain")
             self.oauthClient.client.credential.oauthToken = credential.oauthToken
@@ -55,8 +58,11 @@ class FitbitClient {
         }
     }
 
+    /// Attempts to read OAuthSwiftCredential from the keychain
+    ///
+    /// - Returns: If a valid credential is found, it will be returned
     func readCredential() -> OAuthSwiftCredential? {
-        if let credential = self.keychainWrapper.object(forKey: "credential") as? OAuthSwiftCredential {
+        if let credential = self.keychainWrapper.object(forKey: keychainCredKey) as? OAuthSwiftCredential {
             NSLog("Found credential in keychain")
             return credential
         }
@@ -64,8 +70,19 @@ class FitbitClient {
         return nil
     }
 
+    /// Persists an OAuthSwiftCredential into the keychain
+    ///
+    /// - Parameter credential: credential to be persisted
+    /// - Returns: TRUE if persisted successfully
     private func storeCredential(_ credential: OAuthSwiftCredential) -> Bool {
-        return self.keychainWrapper.set(credential, forKey: "credential")
+        return self.keychainWrapper.set(credential, forKey: keychainCredKey)
+    }
+
+    /// Clears credential token and expiration
+    func clearCredential() {
+        self.oauthClient.client.credential.oauthToken = ""
+        self.oauthClient.client.credential.oauthTokenExpiresAt = nil
+        self.keychainWrapper.removeObject(forKey: keychainCredKey)
     }
 
     /// Check if the current client is already authorized
@@ -90,12 +107,13 @@ class FitbitClient {
     ///   - viewController: the source controller to create the new Safari view
     ///   - success: Callback to be executed on success
     ///   - failure: Callback to be executed on failure
-    func authorize(viewController: UIViewController, success: @escaping () -> Void, failure: @escaping () -> Void) {
+    func authorize(viewController: UIViewController, callback: @escaping (String?, Error?) -> Void) {
         // Set webview handler
         self.oauthClient.authorizeURLHandler = SafariURLHandler(
             viewController: viewController,
             oauthSwift: self.oauthClient
         )
+
         // Authorize
         let _ = self.oauthClient.authorize(
             withCallbackURL: URL(string: self.callbackUrl)!,
@@ -108,19 +126,18 @@ class FitbitClient {
                     let scope = parameters["scope"] as? String
                     else {
                         NSLog("Invalid authorization response")
-                        failure()
+                        callback(nil, FitKitRequestError.invalidAuthorization)
                         return
                 }
                 NSLog("Authorized scope: \(scope)")
                 NSLog("Succesfully authenticated with credentials \(credential.oauthToken)")
                 let _ = self.storeCredential(credential)
-                success()
+                callback(scope, nil)
             },
             failure: {
                 error in
-                // TODO: Maybe return the error
-                NSLog(error.localizedDescription)
-                failure()
+                NSLog("Error authorizing \(error.localizedDescription)")
+                callback(nil, error)
             }
         )
     }

FitKit/ViewController.swift

@@ -23,7 +23,7 @@ class ViewController: UIViewController {
     }
 
     override func viewDidAppear(_ animated: Bool) {
-        authorize()
+        ensureAuthorized(callback: self.updateView)
     }
 
     override func didReceiveMemoryWarning() {
@@ -34,35 +34,53 @@ class ViewController: UIViewController {
     fileprivate func updateAuthorizedLabel() {
         if self.client.isAuthorized() {
             self.loggedIn.text = "Logged In"
+            //self.loginButton.currentTitle = "Log Out"
         } else {
             self.loggedIn.text = "Not Logged In"
+            //self.loginButton.currentTitle = "Log In"
         }
     }
 
-    fileprivate func authorize() {
-        HealthKitHelper.authorizeHealthKit() {
-            result, error in
-            // TODO: Do something with the result and error
-            if !self.client.isAuthorized() {
-                self.client.authorize(viewController: self, success: self.authorized, failure: self.unauthroized)
-            } else {
-                // TODO: this should be made significantly more clear
-                self.displayWeight()
+    /// Ensure that the client is authorized and then continue
+    fileprivate func ensureAuthorized(callback: @escaping (Bool) -> Void) {
+        // If already authroized, we can short circuit
+        if self.client.isAuthorized() {
+            callback(true)
+            return
+        }
+        // Authorize the client
+        self.client.authorize(viewController: self) {
+            scope, error in
+            if error != nil {
+                NSLog("Error encountered when attempting authorization: \(error.debugDescription)")
+            }
+            guard let scope = scope else {
+                NSLog("Did not retreive any authorized scope")
+                callback(false)
+                return
+            }
+            NSLog("Authorized for scope: \(scope). Requesting HealthKit access")
+            HealthKitHelper.authorizeHealthKit() {
+                result, error in
+                // TODO: Do something with the result and error
+                if error != nil {
+                    callback(false)
+                } else {
+                    callback(true)
+                }
             }
         }
     }
 
-    fileprivate func authorized() {
-        NSLog("We have Fitbit auth!!!")
-        updateAuthorizedLabel()
-        self.displayWeight()
+    fileprivate func updateView(authSuccess: Bool) {
+        self.updateAuthorizedLabel()
+        if authSuccess {
+            self.syncWeights()
+        }
     }
 
-    fileprivate func unauthroized() {
-        NSLog("No auth. Booo!!!")
-    }
-
-    func displayWeight() {
+    /// Synchronizes weights from Fitbit to HealthKit
+    func syncWeights() {
         let today = Date()
         let lastMonth = Calendar.current.date(byAdding: .day, value: -31, to: today)!
         self.client.getWeight(start: lastMonth, end: today) {
@@ -70,6 +88,7 @@ class ViewController: UIViewController {
                 fbWeights, error in
                 if let error = error {
                     NSLog("Unable to get weights: \(error)")
+                    self.outputText.text = "Error getting weights"
                     return
                 }