It is now possible to borrow a book from whatever library you are a member of, without actually visiting the library, whatever your reason for doing so maybe. This has been made possible by an ingenious app called Libby, made by OverDrive.
Libraries across the world allow members to borrow any book from their collection as an ebook or even an audiobook. Libby acts as the ideal platform for the distribution of such files.
All a user needs is their library ID card and the Libby app in order to access whatever they want from their libraries from wherever they want to. Right now any authenticated user can access this page. There is no differentiation between types of users or specific users. Now you need to add an admin section of the web application that can only be accessed by admins. First, create a new Java class file AdminService.
The AdminService provides a programmatic way of checking for group membership. Now, you might be asking yourself: wait? The short answer is that while Roles and Groups do have different definitions technically, functionally they can be assigned and checked for in the same way. Next, create another Java class file Roles. This file simply maps the Admin role as an immutable entity a property on the Roles class to a string. You could totally skip the AdminService class and Roles class and just use the PreAuthorize annotation directly on the controller class using the string name for the role.
However, in larger applications with potentially dozens of groups that are being dynamically assigned, having the ability to define them using Java objects and methods is pretty useful. Also, to be using best practices, you should have an interface defined for the AdminService class instead of using the implementation class directly as a dependency.
This would be useful in testing, for example, if you wanted to swap out the bean with a test bean. This step has been omitted for brevity in this tutorial. The next thing you need to do is override a Spring default behavior. At least with the Java part. Add the following code to the SimpleAppController class. Pretty cool, huh? After you've logged in successfully, you should see the sample "Admin message" text from the controller.
In this tutorial, you created a new Java web application using the Azure Active Directory starter, configured a new Azure AD tenant, registered a new application in the tenant, and then configured your application to use the Spring annotations and classes to protect the web app.
Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Note You need to specify your directory URL from earlier in this tutorial when you enter the user name. For example: test-user azuresampledirectory. Note For a full list of values that are available in your application.
Notice how we re-use the head fragment to provide Bootstrap styling for this template. Re-start the app again, and you will get the full experience of the home page changing depending on whether or not you are logged in. The code for this section can be found in the GroupAccessControl tag of the code repo. Spring Security provides a set of annotations and a rich expression language for controlling access to methods in your application.
Among the most commonly used Spring Security annotations is PreAuthorize. And, among the most commonly used SpringEL expressions is hasRole. Let's break down this code by adding a new service that restricts access by Group membership. Here's AdminService :. Line 3 above is the key. The annotation along with the SpringEL expression could be stated in plain English as:. The check to see that user is authenticated part of this may not be obvious. What's going on is that a PreAuthorize check can only be done on an authenticated user.
Spring Security is smart enough to check that the user is logged in before checking to see if they are a member of the specified group.
Let's dig in to the Spring Expression Language above. Where is Spring Security looking for roles. The symbol is special - it identifies a Java bean, in this case named roles. Ultimately, hasRole needs to be checking against a unique href representing a Stormpath Group. To complete this configuration and to make it awesomely dynamic, we need a new class called Roles. By annotating this class with Component on line 1, Spring will instantiate it and expose it as a bean.
Guess what the name of the bean is? Spring will take the name of the class and camel-case it to derive the bean name by default. So, the bean name is roles. The Autowired annotation on line 5 causes the Spring Environment object to be passed into the constructor.
Take screenshot. Click to take a screenshot of the device. For details, see Screenshots. Enter zoom mode. Click so the cursor changes to the zoom icon. To exit zoom mode, click the button again. Right-click to zoom out. Left-click and drag to select a box-shaped area to zoom in on. Right-click and drag a selection box to reset to default zoom. To tap the device screen in zoom mode, Control-click Command-click on Mac.
Return to the previous screen, or close a dialog box, an options menu, the Notifications panel, or the onscreen keyboard. Overview Recent Apps. To open an app, tap it.
To remove a thumbnail from the list, swipe it left or right. This button isn't supported for Wear OS. Single points In the Single points tab, you can use the Google Maps webview to search for points of interest, just as you would when using Google Maps on a phone or in a browser. Routes Similar to the Single points tab, the Routes tab provides a Google Maps webview that you can use to create a route between two or more locations.
To create and save a route, do the following: In the map view, use the text field to search for the first destination in your route. Select the location from the search results. Select the Navigate button. Select the starting point of your route from the map. Optional Click Add destination to add more stops to your route. Save your route by clicking Save route in the map view. Specify a name for the route and click Save.
In the file dialog, select a file on your computer and click Open. Optionally select a Speed. While a virtual device is running, you can add up to two additional displays as follows: Add another display by clicking Add secondary display.
From the dropdown menu under Secondary displays , do one of the following: Select one of the preset aspect ratios.
Select custom and set the height , width , and dpi for your custom display. Optional Click Add secondary display to add a third display. Click Apply changes to add the specified display s to the running virtual device. The emulator lets you simulate incoming phone calls and text messages. To initiate a call to the emulator: Select or type a phone number in the From field.
Click Call Device. Optionally click Hold Call to put the call on hold. To end the call, click End Call.
To send a text message to the emulator: Select or type a phone number in the From field. Type a message in the SMS message field. Click Send Message. To simulate a fingerprint scan on the virtual device: Prepare an app to receive a fingerprint. Select a Fingerprint value. Click Touch Sensor. To rotate the device around the x, y, and z axes, select Rotate and do one of the following: Adjust the Yaw , Pitch , and Roll sliders and observe the position in the upper pane.
Move the device representation in the upper pane and observe the Yaw , Pitch , and Roll and how the resulting accelerometer values change. To move the device horizontally x or vertically y , select Move and do one of the following: Adjust the X and Y sliders and observe the position in the upper pane. Move the device representation in the upper pane and observe the X and Y slider values and how the resulting accelerometer values change.
To position the device at 0, 90, , or degrees: In the Device rotation area, select a button to change the rotation. It lets you adjust the following sensors so you can test them with your app: Ambient temperature : This environmental sensor measures ambient air temperature.
Magnetic field : This position sensor measures the ambient magnetic field on the X, Y, and Z axes, respectively. Proximity : This position sensor measures the distance from an object; for example, it can notify a phone that a face is close to it to make a call. The proximity sensor must be enabled in your AVD to use this control. Light : This environmental sensor measures illuminance. The values are in lux units. Pressure : This environmental sensor measures ambient air pressure.
The values are in millibar hPa units. Relative Humidity : This environmental sensor measures ambient relative humidity.
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