I am having trouble with some Ruby CGI.
I have a home page (index.cgi) which is a mix of HTML and Ruby, and has a login form in it.
On clicking on the Submit button the POST's action is the same page (index.cgi), at which point I check to make sure the user has entered data into the correct fields.
I have a counter which increases by 1 each time a field is left empty. If this counter is 0 I want to change the current loaded page to something like contents.html.
With this I have:
if ( errorCount > 0 )
do nothing
else
....
end
What do I need to put where I have the ....?
Unfortunately I cannot use any frameworks as this is for University coursework, so have to use base Ruby.
As for using the CGI#header method as you have suggested, I have tried using this however it is not working for me.
As mentioned my page is index.cgi. This is made of a mixture of Ruby and HTML using "here doc" statements.
At the top of my code page I have my shebang line, following by a HTML header statement.
I then do the CGI form validation part, and within this I have tried doing something like: print this.cgi( { 'Status' => '302 Moved', 'location' =>
'{http://localhost:10000/contents.html' } )
All that happens is that this line is printed at the top of the browser window, above my index.cgi page.
I hope this makes sense.
To redirect the browser to another URL you must output an 30X HTTP response that contains the Location: /foo/bar header. You can do that using the CGI#header method.
Instead of dealing with these details that you do not yet master, I suggest you use a simple framework as Sinatra or, at least, write your script as a Rack-compatible application.
If you really need to use the bare CGI class, have a look at this simple example: https://github.com/tdtds/amazon-auth-proxy/blob/master/amazon-auth-proxy.cgi.
Related
I have a listing page for an e-commerce website with various items (item_list.php). This page is generated with a PHP loop and displays each item inside a <li> element. Every item is a link to the same page, called item_details.php .
When clicking on the link i want to run a script that changes a SESSION var to a certain $id (which will be excracted from the <li> itself with .innerHTML function) and then allowing the browser to move into the next page (item_details).
This is needed so i can display the proper information about each item.
I think this is possible with Ajax but I would prefer a solution that uses JS and PHP only.
(P.S.This is for a University project and im still a PHP newbie, i tried searching for an answer for a good while but couldn't find a solution)
No JS or other client-side code can set session values, so you need either an ajax call to php, or some workaround. This is not a complete answer, but something to get you thinking and hopefully going on the project again.
The obvious answer is just include it in the link and then get it in PHP from the $_GET -array, and filter it properly.
item title
If, however, there is some reason this is not a question with an obvious answer:
1.) Closest what you're after can be achieved with a callback and an ajax call. The idea is to have the actual link with a click function, returning false so the link doesn't fire at once, which also calls an ajax post request which finally will use document.location to redirect your browser.
I strongly advice against this, as this will prevent ctrl-clicks causing a flawed user experience.
Check out some code an examples here, which you could modify. You will also need an ajax.php file which will actually set the session value. https://developers.google.com/analytics/devguides/collection/analyticsjs/enhanced-ecommerce#product-click
2.) Now, a perhaps slightly better approach, if you truly need to do this client-side could be to use an click handler which instead of performing an ajax call or setting session directly, would be to use jQuery to set a cookie and then access this data on the item_list.php -page.
See more information and instructions here: https://www.electrictoolbox.com/jquery-cookies/
<script>
$('product_li a).click(function(){
$.cookie("li_click_data", $(this).parent().innerhtml());
return true;
});
</script>
......
<li class="product_li">your product title</li>
And in your target php file you check for the cookie. Remember, that this cookie can be set to anything, so never ever trust user data. Test and filter it in order to make sure your code is not compromised. I don't know what you want to do with this data.
$_COOKIE['li_click_data'];
3.) Finally, as the best approach, you should look at your current code, and see if there is something you can re-engineer. Here's a quick example.
You could do the following in php to save an array of the values in the session on each page load, and then get that value provided you have some kind of id or other usable identifier for your items:
// for list_items.php
foreach($item as $i) {
// Do what you normally do, but also set an array in the session.
// Presuming you have an id or some other means (here as item_id), to identify
// an item, then you can also access this array on the item_details -page.
$_SESSION['mystic_item_data_array'][$i['item_id]] = $i['thedata'];
}
// For item_details.php
$item_id = // whatever means you use to identify items, get that id.
$data_you_need = $_SESSION['mystic_item_data_array'][$item_id];
Finally.
All above ways are usable for small data like previous page, filters, keys and similar.
Basically, 1 and 2 (client-side) should only be used, if the data is actually generated client-side. If you have it in PHP already, then process it in php as well.
If your intention is to store actual html, then just regenerate that again on the other page and use one of the above ways to store the small data in case you need that.
I hope this gets you going and at least thinking of how to solve your project. Good luck!
I am currently developing a Ruby API based on Sinatra. This API mostly receives GET requests from an existing social platform which supports external API integration.
The social platform fires off GET requests in the following format (only relevant parameters shown):
GET /{command}
Parameters: command and text
Where text is a string that the user has entered.
In my case, params[:text] is in fact a series of commands, delimited by a space. What I want to achieve is, for example: If params[:text]="corporate finance"
Then I want my API to interpret the request as a GET request to
/{command}/corporate/finance
instead of requesting /{command} with a string as a parameter containing the rest of the request.
Can this be achieved on my side? Nothing can be changed in terms of the initial request from the social platform.
EDIT: I think a better way of explaining what I am trying to achieve is the following:
GET /list?text=corporate finance
Should hit the same endpoint/route as
GET /list/corporate/finance
This must not affect the initial GET request from the social platform as it expects a response containing text to display to the user. Is there a neat, best practice way of doing this?
get "/" do {
text = params[:text].split.join "/"
redirect "#{params[:command]}/#{text}"
end
might do the trick. Didn't check though.
EDIT: ok, the before filter was stupid. Basically you could also route to "/" and then redirect. Or, even better:
get "/:command" do {
text = params[:text].split.join "/"
redirect "#{params[:command]}/#{text}"
}
There a many possible ways of achieving this. You should check the routes section of the sinatra docs (https://github.com/sinatra/sinatra)
The answer by three should do the trick, and to get around the fact that the filter will be invoked with every request, a conditional like this should do:
before do
if params[:text]
sub_commands = params[:text].split.join "/"
redirect "#{params[:command]}/#{sub_commands}"
end
end
I have tested it in a demo application and it seems to work fine.
The solution was to use the call! method.
I used a regular expression to intercept calls which match /something with no further parameters (i.e. /something/something else). I think this step can be done more elegantly.
From there, I split up my commands:
get %r{^\/\w+$} do
params[:text] ? sub_commands="/"+params[:text].split.join("/") : sub_commands=""
status, headers, body = call! env.merge("PATH_INFO" => "/#{params[:command]}#{sub_commands}")
[status, headers, body]
end
This achieves exactly what I needed, as it activates the correct endpoint, as if the URL was typed it the usual format i.e. /command/subcommand1/subcommand2 etc.
Sorry, I completely misunderstood your question, so I replace my answer with this:
require 'sinatra'
get '/list/?*' do
"yep"
end
like this, the following routes all lead to the same
You need to add a routine for each command or replace the command with a * and depend your output based on a case when.
The params entered by the user can be referred by the params hash.
http://localhost:4567/list
http://localhost:4567/list/corporate/finance
http://localhost:4567/list?text=corporate/finance
Is it possible to set the absoluteURI in the controller after clicking on an action link? So for example:
User clicks on a link called "GoHere". The current URL is domain.com/section/place. When the link hits the method in the controller, it recognizes that the user is currently in a section called "section", even though in the file structure section doesn't exist. The link itself actually points to domain.com/place2. Instead of returning a URL of domain.com/place2, it returns domain.com/section/place2.
The reason I ask is because for what I'm doing, the section is completely arbitrary and doesn't exist. It's just there to give the impression that the user is in another section. I know I could create extra sets of controllers, but I'm trying to get around this since for management purposes it's better if I just have one set of controllers. Is this possible? Thanks.
In your gobal.asax, try setting your route to require section for the control. Maybe "{control}/section/{action}/" and whatever else you need.
How would you use Ruby to open a website and do a search in the search field and then parse the results? For example if I entered something into a search engine and then parsed the results page. I know how to use Nokogiri to find the webpage and open it. I am lost on how to input into the search field and moving forward to the results. Also on the page that I am actually searching I have to click on enter, I can't simply hit enter to move forward. Thank you so much for your help.
Use Mechanize - a library used for automating interaction with websites.
Something like mechanize will work, but interacting with the front end UI code is always going to be slower and more problematic than making requests directly against the back end.
Your best bet would be to look at the request that is being made to the server (probably a HTTP GET or POST request with some associated params). You can do this with firebug or Fiddler 2 for windows. Then, once you know the parameters that the server will accept, just make the request yourself.
For example, if you were doing this with the duckduckgo.com search engine, you could either get mechanize to go to duckduckgo.com, input text into the search box, and click submit, or you could just create a GET request to http://www.duckduckgo.com?q=search_term_here.
You can use Mechanize for something like this but it might be overkill. I would take a look at RestClient, especially if you don't need to manage cookies.
Edit:
If you can determine the specific URL that the form submits to, say for example 'example.com/search'; and you knew the request was a POST (which it usually is if you are submitting a form) you could construct something like this with mechanize:
agent = Mechanize.new
agent.post 'http://example.com/search', {
"_id0:Number" => string_to_search_for,
"_id0:submitButton" => "Enter"
}
Notice how the 'name' attribute of a form element becomes a key for the post and the 'value' element becomes the value. The 'input' element gets the value directly from the text you would have entered. This gets transformed into a request and submitted to the server when you push the submit button (of course in this case you are making the request directly). The result of the post should be some HTML that you can parse for the info you need.
I am using ajax to load pages on my website.
Each time a page is loaded I change the url in the browser to
http//www.example.com/old/page/#!/new/page/
by setting it through window.loaction using javascript
Now what I want to do is when someone comes to my website by entering the url
http//www.example.com/old/page/#!/new/page/
he should automatically get redirected to
http//www.example.com/new/page/
This is somewhat that happens on facebook too.
Can someone help me out with the required .htaccess code to achieve the same.
Thanks in advance
I don't think anything past the # symbol in your URL is even visible on the server side. So htaccess, php, etc won't even know the hash is there to begin with. I think in order to pull this off you're going to have to use a client side redirect.
window.onload = function(){
// First we use a regex to check for the #! pattern in the hash
if(window.location.hash.match(/\#\!/i)){
// If we found a match, use substring to remove the #! and do a redirect
window.location = window.location.hash.substring(2);
}
};
This example will redirect the user immediately on page load. Unfortunately doing a redirect in this manner won't help the search engines to reindex your site, but thats just one of the pitfalls of using fancy javascript or hash based URL's.