I have two things. A backend running on App Engine and a Android app. These needs to communicate in a efficient way.
What I already did. I created a api with Google Cloud Endpoints. This endpoint exposes calls. The objects in the backend are mapped to json and mapped back to objects in the Android app. This is what the Endpoints provide.
Sometimes I want to push information from the backend to the Android app. What I do now is I send a Google Cloud Message (GCM) to the Android app and these is updating everything by calling something on the Endpoint of the backend.
This situation is working without problems but it has some drawbacks:
When I update a lot of devices at ones (what is happening a lot in my application) all those devices make a call to the backend and creating a large peak load.
The extra call is using additional battery on the phones.
What I want is to add the updated information into the GCM. GCM has support to add 4kB of data. Large enough to add the json with the updated information. If I want to send more then 4kB I can always use the old situation.
So, basicly what I want is the following:
When I'm going to send a GCM I retrieve the the correct objects from datastore/database.
Those objects needs to be converted to json in the same way as the Endpoint library does.
The json should be added to the GCM.
In the Android application the json should be convert back to objects in the same way as the Endpoint library does.
Continue processing those object the same way as before.
I found a thread that suggested that I should the gson library to do this. But I have problems in both backend and Android app. And also the json itself is not the same. I want to use the Endpoint library to serialize the same json and to deserialize to the same result as a Endpoint call.
Does anybody have any idea how to do that? Maybe a example or tutorial?
Related
I'm trying to teach myself about integrating systems via WebHooks.
In a free/hosted GIS system, I can create a WebHook that would, in theory, POST a JSON object to an external system.
The problem is, I don't have an external system that's available right now for for receiving the POST.
I think I need some sort of publicly available sample server that would:
Receive the POST requests
Do something with the requests (ie. create some sort of record)
...so that I could determine if the WebHook worked correctly or not.
How can I test my WebHooks without having an on-premise external system?
I've poked around websites like Postman Echo and Amazon Lambda. But to my untrained eye, it seems like they're not quite designed for what I need.
You could use any of these options depending on your requirements:
You could use webhooks modules in services like Integromat or Zapier to receive webhook data and then apply transformation.
You could deploy a script on heroku and use the URL generated there to send the webhooks calls.
You could also use services like requestbin, webhook.site etc if you just want to receive webhooks data.
Regards
I was wondering how I could link my application to kraken.com server.
For example, making a login activity that sends the username and password to the server and if it's correct, open another activity.
The kraken's API is given by the following link: https://www.kraken.com/help/api
The problem is that I don't know how this API exactly works. How can I make HTTP Request and what is json? Consider I'm new in this area (API).
So firstly, JSON stand for Javascript Object Notation, it's a syntax for exchanging or storing data.
I'm assuming you're using Java since you're using Android Studio.
Looking at Kraken's API page: https://www.kraken.com/help/api#example-api-code
They don't currently have support a 3rd party Java Library for API access. So you would be looking a using a RESTful approach.
Here is an example of how to use that approach in Java: https://www.mkyong.com/webservices/jax-rs/restfull-java-client-with-java-net-url/
have been with mvc for a little while. the usual case when an action returning json, it is initialized by ajax in the view and the view is expecting info inside the json.
is there a case the action returning json to the view and is caught by something else instead of javascript? Thanks.
Yes, a JSON API can be consumed by a large variety of clients. It can be the browser sending an AJAX request, but it can also be a desktop application fetching data from the Internet, a server-side job scraping the data for analysis, etc.
For example, let's say you're running a stock exchange website, and you're publishing current stock values as JSON. You can use that JSON on your website to display the data, but you (or any other developer) can also write a desktop application which will get that data and process it on a local machine (to, for example, show the user which stocks they should buy). Or aggregate data from different sources.
Many websites make their APIs public, so that third party developers can write alternative clients, integrate the API's functionality in their own products, and so on. For example, GitHub's APIs are public - the GitHub website can utilize them for the AJAX requests, and GitHub for Windows can show you the list of repositories you own by making a request to that API using C#'s WebClient.
Once I have created my Web App with Zend2 , zfcUser and bjyAuthorize it's time to create the mobile App.
Our approach is to create and app with a json interaction with the Zend2 background.
The problem is that I don't know where to start in order to deal with a jSon Auth. Is possible wit zfcUser? any example out there?
Thanks in advance
ZfcUser module provides support for additional authentication mechanisms via plugins (Google, Facebook, LDAP, etc), but this feature seems to be in development now.
If you need that your mobile application to authenticate through some custom protocol based on JSON format, all you have to do is to create a controller action (say, mobileAuthAction()) which takes a JSON array with user credentials from POST, uses zfcUser API to authenticate the user, and return the response in JSON format. You may also look at view_manager configuration key to adjust the rendering strategy for your action to allow it to return JSON. Alternatively, you may call the $viewModel->setTerminal(false) to disable the layout rendering and echo your JSON to standard output.
I'm currently working in HTTP JSON API for a touristic webapp. The webapp will be developed by a third-party company and it'll consume the API within the browser.
So I need for the API some sort of authentication to the third-party webapp can consume it. I've been researching a little bit about OAuth, but with this, I have a solution for a user-wide but not for application-wide authorization.
Because the webapp will consume the API within the browser(with Ajax), I'm concerned they will have to put the credentials to consume the API in the user browser.
Another solution would be place the credentials for the API in the server-side, but this don't depend on me.
You could always use something similar to google's method, with a client ID and then a private key used to generate a signature.
https://developers.google.com/maps/documentation/business/webservices#generating_valid_signatures
That page has some code samples as well.