I have created a HTML5 webapp that runs quite nicely on most smartphones. Program can accept input from a user, store the information, display it, edit it, delete etc. Works fine.
I was wondering if there is yet a standard way fo sychronising this information with a remote MYSQL server, heck at this point I would settle for being able to post the information directly to a remote server, completely skipping localstorage.
I have looked at the websqlsync on github, but having limited success getting it working.
Any guides, working examples, tutorials or general pointers or best practice at getting html5 localstorage onto a MYSQL server greatly appreciated.
Why don't you save the localStorage object as a JSON string, and pass that to the remote server? What do you want to do with the data on the server?
Related
I am creating a mobile application using swift for my organization. The application reads in data in JSON format to populate the information that gets displayed on the application. I already have a method to generate the JSON files, but I need somewhere to host the actual files. I have an AWS account and an instance running, this is where I initially was hosting my JSON files but I got an email from AWS saying that having the app constantly grab the JSON files that I stored on the site resembled scanning behaviour, which is not allowed apparently. So I was wondering where I could host JSON files so that my mobile app can read in the information it needs. The biggest thing that I need is that I can host it with a static URL that I can keep calling with my app.
I was thinking of potentially putting the files on an AWS bucket with read permissions and having those get accessed, but since AWS already complained about me doing something like that I'm iffy. I was also thinking of putting the JSON files on Github, but again I'd hate to get an email from github telling me that they don't like that an application keeps grabbing the data.
For background, the app essentially has a hardcoded URL that grabs the JSON data and parses it. I didn't do an api because an API takes some time to grab all the information that doesn't really change that often, it's much easier to generate the JSON files locally and just post them online somewhere. The information on it can be read by anyone too it's not private or anything.
Message from AWS:
Hello,
We've received a report(s) that your AWS resource(s)
information
has been implicated in activity which resembles scanning remote hosts on the internet for security vulnerabilities. Activity of this nature is forbidden in the AWS Acceptable Use Policy (https://aws.amazon.com/aup/). We've included the original report below for your review.
Please take action to stop the reported activity and reply directly to this email with details of the corrective actions you have taken. If you do not consider the activity described in these reports to be abusive, please reply to this email with details of your use case.
If you're unaware of this activity, it's possible that your environment has been compromised by an external attacker, or a vulnerability is allowing your machine to be used in a way that it was not intended.
We are unable to assist you with troubleshooting or technical inquiries. However, for guidance on securing your instance, we recommend reviewing the following resources:
I'm new so it won't let me post links but they attached a couple help links
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more links I can't have
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Using an AWS EC2 instance to host static files (which is what it sounds like you were doing?) is pretty standard and I suspect that this is not what Amazon is complaining about. More likely, your instance has been infected by some sort of software which is causing it to request many files from other random servers on the web ("scanning for remote vulnerabilities"). You should check that you have not accidentally publicly posted your AWS credentials (in any form), and consider wiping the instance and resetting it. And of course reply to the email explaining this to AWS.
I'm struggling to find a solution to what I thought would be a common requirement so I'm hoping someone can help me with some pointers on what to search for/areas to explore.
Background
I'm building an iOS mobile app. I'm storing data locally using realm.io. The app is preinstalled with a snapshot of the content of a Wordpress mySQL database (it uses custom types). The content of the WP database is only written via the Wordpress install, the mobile app cannot write data.
Objective
So, I want to be able to check for changes since a given date (whenever the local database was last updated) and send the changed records to the mobile app (via the wp JSON api?).
I think I can fetch "posts since a date" but I need a full list of all create, update and delete operations since a given date.
Since the app is read-only I thought this type of one-way sync would be pretty straight forward but I can't find a common solution.
Any ideas to point me in the right direction would be great. Obviously, if anyone has any experience of doing this sort if thing with realm.io then that would be amazing :-)
Realm doesn't support yet any sort of synchronization mechanism across different files. We have an issue about that though, but you're likely searching rather for a solution in the immediate future.
Update: Realm launched the Realm Mobile Platform. This offers synchronization functionalities and would greatly simplify the solution for this use case.
You could use e.g. the server-side Node.js binding to pull new data from your MySQL Wordpress installation and push them to a global Realm served by the Realm Object Server. This can be read-only synchronized from the mobile apps, which would automatically receive the deltas and provide updated data to your users.
Whatever mechanism you come up yourself though in the meantime, it would require that you have read-write access from your iOS application to the realm database, so that you can update it with new data.
Pushing changed records as you describe is likely not going to work.
Apple's Push Notification service (APNS), which is the only back communication channel that works when your app is in the background or suspended, allows you to send very small payloads. You would use that to signalize your iOS app, that something changed on the server-side and there is new data to load. You would then initiate a request to a JSON-based API, wait for the response, map the returned JSON to Realm objects and store them in your database.
You want probably read more in the "Downloading Content in the Background" section of background execution chapter in the official App Programming Guides for iOS.
While pre-seeding the database from the app bundle seems like a nice idea, because the user wouldn't need to wait initially after downloading the app, that will enlarge the app itself with data, which might become in the future completely irrelevant.
i've been searching for the answers for a day or two and i still don't know how to approach this problem.
i want to make an application to upload really large files to a server. i've decided to go for the adobe air because i thought it would be less restricting than flash, anyways, i am using actionscript3.
if i wanted to use a regular file uploading class i meet a server restriction of max file size (i tried working with php).
i googled something about "chunked fileupload" where i send small amounts of 64bit encoded data to a server via urlloader class and then merge them in php. this, however, creates a massive extra upload size overhead (because of the 64bit encoded data).
another idea i read about is to use a "socket connection" send a direct tcp stream. however, i have absolutely no idea how do sockets work and what should i use as a server. i tried using some simple php socket example code found online but i didn't really understand how would i use this for fileupload and flash didn't want to connect to it anyways. maybe someone could enlighten me on that?
or maybe someone has a better experience in the chunked fileupload method? is there an already existing library for handling large fileuploads in actionscript?
really ANY advice would be appreciated, i feel kind of lost in my quest.
i do have control over the server to some extent maybe i will convince sysadmins to install some service for me.
I'm building a Phonegap application and i'm planning to set it to work in both Offline and Online mode, the idea is to get JSON Data from a PHP server side script and show it in the application, these data contains text, images so my question is is there anyway to set a dynamic cache manifest or any other way in a way that the user can see the already loaded data when he's offline, like caching the json result itself or anything else you can help me with
thanks
What do you mean by "work in both Offline and Online mode"? Are the users able to only see the user created data or can they modify it too? Is it correct to use a Manifest to control caching of user created data? I would have thought you should only really use it for caching the application templates and code. In any case I think you'll probably need something that you can exert more control over, something based perhaps using WebSQL, IndexedDb or LocalStorage.
I have been working on the modify-it-too question for many months and have a solution in the form of javascript(phonegap) <-> server synchronization that works somewhat like a version control system, with version numbers and conflict resolution. There's some pretty great docs and demo on the GitHub page and you can even see a presentation courtesy of SkillsMatter / LondonAJAX.. Currently there is only a JS/Node based server but I will probably do PHP based server because that's my day job If you look at the server code it's pretty easy to implement.
BTW I would use a different method to store the images, why not just download them and store them in a File, I don't know the storage limits, but I bet that is the way that Phonegap will let you get away with most.
Do I have a way to retrieve post data submitted via HTML form? Particularily in Firefox, on Windows XP. I suppose Firefox holds it in it's directory inside Application Data, but they are bunch of files which names do not give any clue. They don't even have extensions, some of them are text, some binary.
Just don't tell me that post data is not stored anywhere locally.
Of course it isn't stored locally.
Do you really want Firefox to store all of your passwords and credit card numbers?
Submitted form data is not stored locally or remotely unless you have software built to do something with it. With some of the new HTML5 additions (local storage) you could code up something in JavaScript to store your posted form data but this would only be on your computer. Generally you want to post data to a remote server for processing and/or storage using one of the many server-side programming languages.
Hope this helps and sorry to give you the answer you didn't want to hear. :-)