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Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. By Sridhar Poduri. The world of connected devices is increasingly moving into a heterogeneous mixture of native apps, Web apps and Web sites all connecting to a mix of cloud- and non-cloud-based services. These apps share and consume data through this mishmash of devices and services and provide rich, immersive experiences for end users. These users are increasingly using apps installed on their personal devices smartphones, tablets, PCs and other similar devices.

Developers are tasked with creating seamless experiences in those apps to facilitate sharing, organizing and viewing data—and to delight users. Apps are written in a variety of programming languages. Some, such as PHP, C , and Java, are by default Web-enabled and might meet the needs of some of the common scenarios for sharing and consuming data. In other cases, specialized libraries might be utilized to perform server-side computing, processing, and analysis, and return a response to the client app.

It aims to provide developers with tools and APIs that solve day-to-day problems of moving native code to the cloud.

The initial release is a client-side, cross-platform library to access REST services. The Task Class A task represents an operation that could potentially finish when the function producing said task has already returned. Doing so will block the thread and defeat the whole purpose of building asynchronous patterns in code. It relies on attaching a handler function to the task, similar to promises in JavaScript extensions for Windows Store apps.

In a way, streams are disconnected from the underlying medium used to read and write data. I wanted a lightweight, cross-platform class that supports OAuth, so I set out to build one to support Dropbox authentication. Before I begin writing an application that can access Dropbox, I need to register it with Dropbox. This is done at the Dropbox Apps console portal bit. The process asks you to choose an app name, app type and a permission type.

Figure 1 Choices for Creating a Dropbox App. I made note of these because I need them to perform programmatic authentication and authorization requests using OAuth. Figure 2 Choosing Dropbox App Details. Now for the real action! As I said earlier, I wanted to write a cross-platform class that could be used across both Windows and Linux. In order to support OAuth-based authentication for Dropbox, I had to meet the following main requirements see the Dropbox site for full requirements :.

Building an encryption API that works across both Windows and Linux is complex and time-consuming, and is worth a detailed exploration later. Once I settled on the requirements, it was time to build the class. I declared a high-level namespace, conveniently called Authentication, and a class inside named oAuth.

At the namespace level, I had a few const strings declared for the URI endpoints, the app key and app secret for the app obtained in the app registration process, and a few helper methods, as shown in Figure 3. Dropbox attempts to build the exact signature on its end using the parameters passed with the HTTPS request and match the signatures generated.

A signature is built using a random number—called a nonce in OAuth parlance—including a time stamp for the request, the version of OAuth protocol supported, the signature type and more. The method returns a list of all the required parameters, sorted by name and with the signature URL encoded see Figure 4. With support for OAuth out of the way, I wrote the client code to access files on Dropbox. I created four methods:. Next, I create an instance of the oAuth class and call the member function CreateOAuthSignedParameters, which builds a map containing all the necessary OAuth request parameters.

Signing of headers is mandatory as per the OAuth specification. The HTTP communication begins now. Dropbox will use the request string and header information and attempt to build the same request string on the server side and match it against what I send as part of the HTTP request.

If the strings match, I get a success return code; otherwise, I get an error. The token should be sent along with all subsequent API requests to Dropbox. It really is this simple. As a matter of fact, all of the low-level implementation details are abstracted away from the public interface of the library.

Stay tuned! Sridhar Poduri is a program manager in the Windows team at Microsoft. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Table of contents Exit focus mode. Table of contents. In this article.