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New Module: AppApi

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3 minutes ago, David Lumm said:

Hey all!

I was wondering, is there any concept of "middleware" or hooks that I could attach to so I could run something on every request?

At the moment I've got a couple of things I've added into every route function, but I can anticipate that list getting longer. Rather than copy and paste the same lines into each and potentially miss something, it would be great if I could run it before the route specific code runs. Is that possible @Sebi?

Hi HI David, in PW any function in a module that has ___ at the start, like ___handleApiRequest() in the AppAPI module you can use as a hook in your own code. See https://processwire.com/docs/modules/hooks/

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10 minutes ago, benbyf said:

Hi HI David, in PW any function in a module that has ___ at the start, like ___handleApiRequest() in the AppAPI module you can use as a hook in your own code. See https://processwire.com/docs/modules/hooks/

Ah that's great, thanks! I'll take a look at that and see what I can work out!

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21 hours ago, Sebi said:

Hi @thibaultvdb,

thank you for reporting this issue! 
I'll be honest: In my Apis I actually always use arrays as return values, so I didn't notice this bug. With version 1.1.2, which I just released, you can use a stdclass again instead of an array as return value. 

I hope everything is running smoothly again with your Api? I would be very happy about a short feedback!

hi @Sebi

Awesome, thanks for the quick feedback and fix. Normally I use a lot of array's myself but I had a specific case where a object was the ideal way to go 😛.
I'll test it out in the following days!
Version 1.1.1 is working good for me, however I'm not doing really special stuff with it at the moment so I'm not sure if my case is the best feedback 😛.
I'm just opening the api  for visitors so I can use it a little like a restApi (doing some fancy ajax stuff) and it's doing exactly what I would expect so great work!

If you want me to check some other parts, let me know!

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Hi @Sebi, I ran into a bug:

Currently the Router::handleError() function incorrectly reports HTTP 500 errors that result from methods that should have remained silent, because they are called with the error control operator '@'.

As the PHP documentation on error control operators puts it: 

Quote

If you have set a custom error handler function with set_error_handler() then it will still get called, but this custom error handler can (and should) call error_reporting() which will return 0 when the call that triggered the error was preceded by an @.

I bumped into this while working on a project with some semi-broken images, where the APP API module kept throwing 500's from PW's ImageInspector class.
Exif issues can be rather difficult to handle sometimes..

The solution is simple: just add a check error_reporting() before the handleError method, for instance

  public static function handleError($errNo, $errStr, $errFile, $errLine)
    {
        if (error_reporting()) {
            $return = new \StdClass();
            $return->error = 'Internal Server Error';
            $return->devmessage = [
                'message' => $errStr,
                'location' => $errFile,
                'line' => $errLine
            ];
            self::displayOrLogError($return, 500);
        }
    }

 

 

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I just released version 1.1.3 which resolves three issues that were reported recently:

  • Fixes an issue with the constructor signature of the modules AppApiException class (by @David Lumm, thanks for PR 🤗)
  • Fixes an issue with the error-handler, which made it mistakenly catch errors that should have been ignored via @ operator (Thanks to @eelkenet)
  • Switched from `wire('input')->url` to `$_SERVER['REQUEST_URI']` for reading the base-url, because ProcessWire's internal function transferred everything to lowercase. (Thanks to Github-user @pauldro)

Thank you all for your contributions!

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I've read the doco, installed the module & Twack and no matter what I try when retrieving a page, all I get back is a successful Promise or worse, an error message about invalid json. Using React/Nextjs and the page is published, viewable & using the basic-page template. The authorisation is single JWT and the client JS code is:

export async function PWPageByUrl(path)  {
  // url is correct and returns a result, just not the one I was expecing
    const res = await fetch(`${process.env.NEXT_PUBLIC_API_URL}/${process.env.NEXT_PUBLIC_API_VERSION}/page/${path}`, {
            headers: {
                'x-api-key': process.env.NEXT_PUBLIC_API_KEY,
                'authorization': process.env.NEXT_PUBLIC_TOKEN
            }
        }
    )
    const data = await res.json()
    if (!data) {
        return {
            notFound: true,
        }
    }
    return {
        props: {
            data
        }, // will be passed to the page component as props
    }
}

On the PW server side as per doco with routes modified for v1, I have:

Spoiler

<?php
namespace ProcessWire;

require_once wire('config')->paths->AppApi . "vendor/autoload.php";
require_once wire('config')->paths->AppApi . "classes/AppApiHelper.php";

require_once __DIR__ . '/TwackAccess.class.php';

$routes = [

    'v1' => [
        'page' => [
            ['OPTIONS', '{id:\d+}', ['GET', 'POST', 'UPDATE', 'DELETE']],
            ['OPTIONS', '{path:.+}', ['GET', 'POST', 'UPDATE', 'DELETE']],
            ['OPTIONS', '', ['GET', 'POST', 'UPDATE', 'DELETE']],

            ['GET', '{id:\d+}', TwackAccess::class, 'pageIDRequest'],
            ['GET', '{path:.+}', TwackAccess::class, 'pagePathRequest'],
            ['GET', '', TwackAccess::class, 'dashboardRequest'],

            ['POST', '{id:\d+}', TwackAccess::class, 'pageIDRequest'],
            ['POST', '{path:.+}', TwackAccess::class, 'pagePathRequest'],
            ['POST', '', TwackAccess::class, 'dashboardRequest'],

            ['UPDATE', '{id:\d+}', TwackAccess::class, 'pageIDRequest'],
            ['UPDATE', '{path:.+}', TwackAccess::class, 'pagePathRequest'],
            ['UPDATE', '', TwackAccess::class, 'dashboardRequest'],

            ['DELETE', '{id:\d+}', TwackAccess::class, 'pageIDRequest'],
            ['DELETE', '{path:.+}', TwackAccess::class, 'pagePathRequest'],
            ['DELETE', '', TwackAccess::class, 'dashboardRequest'],
        ],
        'file' => [
            ['OPTIONS', '{id:\d+}', ['GET']],
            ['OPTIONS', '{path:.+}', ['GET']],
            ['OPTIONS', '', ['GET']],

            ['GET', '{id:\d+}', TwackAccess::class, 'pageIDFileRequest'],
            ['GET', '{path:.+}', TwackAccess::class, 'pagePathFileRequest'],
            ['GET', '', TwackAccess::class, 'dashboardFileRequest']
        ]
    ]
];

and the TwackAccess class copy/pasted from the documentation, eg for pagePathRequest:

Spoiler


  <?php
	/**
     * General function for page-outputs:
     */
    protected static function pageRequest(Page $page) {
        // Exit if Twack is not installed
        if (!wire('modules')->isInstalled('Twack')) {
            throw new InternalServererrorException('Twack module not found.');
        }

        // This commands Twack to output a data-array instead of HTML:
        wire('twack')->enableAjaxResponse();

        // If the page has no template, is not accessable or is blocked (i.e. via hook),
        // we throw a ForbiddenException
        if (!$page->viewable()) {
            throw new ForbiddenException();
        }

        $ajaxOutput   = $page->render();

        // $ajaxOutput will contain JSON-code, so we have to decode it to prevent it is encoded twice:
        $results      = json_decode($ajaxOutput, true);

        // Now, $results is a clean PHP-array with the information generated by Twack-components:
        return $results;
    }

 

 

I'm obviously missing something. Help to get it working as expected much appreciated.

Thanks

 

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4 hours ago, psy said:

I'm obviously missing something. Help to get it working as expected much appreciated.

Hi @psy,

At first glance, I can't find any obvious error in your code. Can you please show me the server response you get for the "Invalid Json" errors? (You can see each request/response in your browser's developer-console in the network-tab. Feel free to DM me if you need support for that.)

I would try to take out some complexity first and leave Twack out of the queries for now. It's best to set up a test route that only returns a simple response. Insert this to your Routes.php:

'v1' => [
    'test' => [
        ['OPTIONS', '', ['GET']],
            ['GET', '', AppApiTest::class, 'test']
        ]
    ],
]

And create the AppApiTest-class:

<?php

namespace ProcessWire;

class AppApiTest {
    public static function test($data) {
        return [
          'test' => true,
          'success' => 'YEAH!'
        ];
    }
}

No token-authentication needed. If you get this response back in Javascript, we can be sure that the basic api connection works.

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@Sebi Thanks for the quick response. I'd already gone past that point both in PW and Postman so the connection is good.

I'd even written my own method in Examples to get a page by ID. Maybe not as sophisticated as yours but it too worked:

<?php namespace ProcessWire;

Class Example {
  
  	public static function test () {
		return ['test successful'];
	}

  
      public static function getPageById($data) {
        $data = AppApiHelper::checkAndSanitizeRequiredParameters($data, ['id|int']);

        $p = wire('pages')->get("id=$data->id");
        if(!$p->id) throw new \Exception('Page not found', 404);

        $response = new \StdClass();

        // Hardcode any data you need that does not have an inputfield field in the admin
        $response->id = $p->id;
        $response->name = $p->name;
        $response->path = $p->path;

        // This retrieves all the admin input fields. Does not (yet) get page images or files, just single entry data
        $fields = $p->getFields();
        foreach ($fields as $fld) {
            $fldName = $fld->name;
            $response->$fldName = $p->$fld;
        }

        return $response;
    }
}

This enabled me to get the page data into the NextJS client and embed in the 'template/component' as variables from any existing PW page.

My next exercise was to delve into the NextJS router so that I could retrieve pages via their path and those paths would appear in the URL. Couldn't work it out in my own PW code (no surprises there!). It was then I installed your Twack module and used the Twack routes & TwackAccess.class.php at which point I ran into the issues mentioned above.

I'm sure it's my lack of knowledge of REACT/NextJS rather than your code... Doesn't help when their doco doesn't match up with their examples in gitHub.

Even so, it would great to use your TwackAccess classes rather than reinventing the wheel.

 

 

 

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@psy So, just to make sure, that everything works well on the PHP side: You can make a request via Postman to the same url that you are trying to access via Javascript? And you get back the expected JSON-data?

Unfortunately, I don't know much about NextJS and React. I am actually an Angular or Vanilla Javascript developer. In an Angular environment I would use Angular's httpClient to make an api-call:

const params = new HttpHeaders({
	'x-api-key': environment.api_key
});
this.httpClient.get('https://my-test-domain.com/api/page/1042').subscribe(
	response => console.log("Api-Response: ", response)
);

I assume that React has a similar helper class as well. This makes a call to the page-route in my router-definition, which you can see here: https://github.com/Sebiworld/musical-fabrik.de/blob/master/site/api/Routes.php . It will return the ajax-results for the ProcessWire page with id 1042 in this case.

I prefer to use the httpClient (if available) instead of the fetch function, which you are using in your code-example above. Mainly because I found the fetch function very cumbersome to use when dealing with more complex parameter data. But for a vanilla-js project I needed to use it, so I wrote a helper class that is way more usable: https://github.com/Sebiworld/musical-fabrik.de/blob/master/site/templates/src/js/classes/AjaxCall.js

Here is how you can make an api-call:

const ajaxCall = new AjaxCall({
	method: 'GET',
	path: '/api/page/1042',
	headers: {
		'X-API-KEY': 'oiasnduz3498gfsubasd'
	}
});
ajaxCall.fetch().then(function(response){
  console.log('Api-response: ', response);
}).catch(function(response){
  console.log('Api-error: ', response);
});

I hope that helps you out 😊

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