I am trying to create an HTTP Server inside my iOS application, to develop something like Xender application. Right now I Succeed to setup HTTP Server inside my Application and hosting any HTML file there, that can be loaded on another Device/System using IP and Port.
But, I want to Link that HTML to my application database to populate data on that HTML file, followed by making it dynamic so that It can be opened from another device or system.
Ultimately, I need to Query on SQLITE database of application from
HTML file, Is there any way to do such thing?
Can I connect SQLITE to frontend of HTML? In case of Web apps these things can be done using any server side scripting languages like PHP, by connecting with Databases like MySQL. But, Here My case is HTML and Sqlite.
EDIT
I found Is it possible to access an SQLite database from JavaScript? . but this is all about Client side local storage, but I think in my case its on Server side SQLITE.
You have to create template HTML files and provide a set of variables for it. Then, when the file is requested in your server, you load it into memory.
Now you do some RegEx magic to get the query parameters, do your SQL stuff and then replace the corresponding variables in your HTML string and finally serve it to the client.
Your would need to define your own non-logical "scripting" language that is able to tell your application what data is requested and where to output possibly returned data.
I think this is quite hard work and you should possibly try to find a better solution that is probably already done by others.
EDIT
You could use Node.js and this interpreter but it's not maintained anymore. But their might be similar projects.
EDIT II
I've found the neu.Node, which sounds quite promising. They haven't done anything in 4 months, but they seem to be well organized and documented.
Related
I am developing a web application with Dart using redstone and polymer
Because Dart allows for server and client side development, I wonder what a good pattern for a web application is (specifically to Dart)
Option 1:
Have a server, say, /bin/server.dart
1.1. get a request there and respond with json
#app.Route("/user/:id", methods: const [app.GET])
getUser(int id) { ... }
have a client, i.e. web/user.html and web/user.dart
2.1 in user.dart make a request to server
2.2 receive json and form a proper user.html
Option 2:
Have a server /bin/server
1.1 get a request there and respond with an html page, similar to
#app.Route("/")
helloWorld() => "Hello, World!";
If in the first case I more or less know (and understand) how to make things work, while i find it really frustrating that I do not take advantage of Dart's server-client code-sharing: I need to encode to and decode back json to get the same data. Is there a way to avoid it?
The second option is much less clear for me: how would I serve a web page in this way? How would I make Polymer do its work?
Answers on the questions in the text and a general explanation of a darty way to develop web apps are very much appreciated.
You can see a Redstone + Polymer application example here: https://github.com/luizmineo/io_2014_contacts_demo
Basically, it works as Option 1: The client and server communicates through a service API, and the data is encoded as JSON. Although, Redstone uses the shelf_static package to serve the client code to the browser as well.
If you prefer, it's also possible to use a server side template engine, such as mustache, to build html pages in the server, although, I think it would be really difficult to integrate that with Polymer.
And finally, you always have to encode the data someway when transferring data between client and server, but this doesn't means they can't share code. They can use the same domain classes, for example. Check out the sample application linked above for more details.
I don't think the option 2 is possible. Polymer depends on dart:html which is not allowed on server side.
I'm a novice web developer with some background in programming (mostly Python).
I'm looking for some basic advice on choosing the right technology.
I need to serve files over the internet (mp3's), but I need to implement some
control on the access:
1. Files will be accessible only for authorized users.
2. I need to keep track on how many times a file was loaded, by whom, etc.
What might be the best technology to implement this? That is, should I
learn Apache, or maybe Django? or maybe something else?
I'm looking for a 'pointer' in the right direction.
Thank!
R
If you need to track/control the downloads that suggests that the MP3 urls need to be routed through a Rails controller. Very doable. At that point you can run your checks, track your stats, and send the file back.
If it's a lot of MP3's, you would like to not have Rails do the actual sending of the MP3 data as it's a waste of it's time and ties up an instance. Look into xsendfile where Rails can send a response header indicating the file path to send and apache will intercept it and do the actual sending.
https://tn123.org/mod_xsendfile/
http://rack.rubyforge.org/doc/classes/Rack/Sendfile.html
You could use Django and Lighttpd as a web server. With Lighttpd you can use mod_secdownload, wich enables you to generate one time only urls.
More info can be found here: http://redmine.lighttpd.net/projects/1/wiki/Docs_ModSecDownload
You can check for permissions in your Django (or any other) app and then redirect the user to this disposable URL if he passed the permission check.
I'm trying to build an iPad app to download and display documents (pdf, ppt, doc, etc.) from a web server.
Currently it does this by parsing the HTML structure (using hpple) on the server.
For example, the files are held at:
Http://myserver.com/myFolders/myFiles/
The app goes to this location and traverses the tree, using an X-Path query, e.g.
"/html/body/ul/li/a"
It then downloads whatever documents it finds to the iPad for display.
So far this works quite well but the server is publicly accessable.
My question is, how would I go about doing something similar with a secure server?
e.g. is it possible to password protect the server, connect to it with username/password from the iPad and use the same system?
In the end I decided not to parse the HTML as there seemed to be no straightforward way to do so. Instead the documents are held on an ASP.Net server with authentication required for access.
It would've been nice to know how to do so by traversing HTML but no biggie.
We're implementing Elmah for an internal application. For development and testing we use a single server instance but on the production environment the app is delivered using a load balanced environment.
Everything works as charm using Elmah, except for the fact that the logs are done independant in each server. What I mean with this is that if an error happens in Server1 the xml file is stored physically on that server and the same for Server2, since I'm storing that files on the App_Data
When I access the axd location to see the error list, I just see the ones of the server that happened to attend my request.
Is there any way to consolidate the xml files other than putting them on a shared folder? Having a shared folder will make us to allow the user that executes the application on the server to have access to that separate folder and to be on only one of the servers instead of both.
I cannot use In-Memory or Database logging since FileLog is the only one allowed.
You might consider using ElmahR for this case, since you are not able to implement In-Memory or Database logging. ElmahR will provide you with a central location for the two load balanced servers to send errors to (in addition to logging them locally) via an Http post. Then you can access the ElmahR site for to view an aggregated list. Also, ElmahR is storing the error messages in a SqlServerCE database, so it can persist the error messages it receives.
Keep in mind that if the ElamhR Dashboard app design does not meet your initial needs/desires, it could be modified as needed given that it is an open source project.
Hope this might be a viable option.
I've written a REST server in Delphi XE (using the wizard) and I want to change the URLs a bit so that instead of having
http://192.168.1.84:8080/datasnap/rest/TServerMethods1/GetListings
I get something that looks more like http://192.168.1.84:8080/GetListings
Is there a nice easy of doing this?
The naming convention is (Delphi XE3):
http://my.site.com/datasnap/rest/URIClassName/URIMethodName[/inputParameter]
You can easily change the "datasnap" and "rest" part of the URL in the TDSHTTPWebDispatcher component properties. You can change the Class Name and Method Name of the URL by simply changing the name of your class and method. However, you still have to have 4 components to the URL, so for example it could be:
http://my.site.com/api/v1/People/Listing
See here:
http://docwiki.embarcadero.com/RADStudio/XE3/en/REST#Customizing_the_URL_for_REST_requests
You could put IIS or Apache in between to accomplish this, and indeed rewrite the URL to point to your service the way you like.
That provides some more advantages anyway (security and scalability mostly). For example, you can create a fail-safe setup with double servers, or you can create multiple machines with your service, and have your web server do the load balancing for example.
You'll get extra logging capabilities, and if you easily want to serve other web content it's easy to have a full fledged web server anyway.
URL rewriting is usually done in the web server configuration, in Apache using entries in the .htaccess file