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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: 


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: {
        }, // will be passed to the page component as props

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


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:


     * 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:

        // 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.



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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:


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
	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'
  console.log('Api-response: ', response);
  console.log('Api-error: ', response);

I hope that helps you out 😊

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I released v1.1.4 of AppApi. The update fixes a critical bug that occurred when routes were called with GET parameters.  (reported by @David Lumm, thanks for PR 🤗)

Because I was already at it, I outsourced the reading of the current route (which is then further used by FastRoute) to its own hookable function `___getCurrentUrl()`. This allows you in special use cases to subsequently influence the URL with your own hook function.

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Hi @Sebi

kann you confirm that the latest PW (3.0.173) breaks AppApi (404 on the routes) or is it something on my part.

EDIT: confirmed it myself, Downgrading to 3.0.172 with no other changes solved the issue

Thank you!

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On 3/9/2021 at 4:41 PM, csaggo.com said:

confirmed it myself

Yep, everything I had working with AppApi and REACT/NextJS broke with the PW 3.0.173 upgrade. Downgrading is a short-term option but limits future PW upgrade benefits

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Hi everyone! 

I did not have the time to look deep into it, but looks like version 3.0.173 has made some changes into the handling of hooks. Especially hooks for custom urls, like we do in AppApi. Previously we had to use a little workaround to get it done - we hook into 404 (site not found) exceptions and generate our own response, if the request was made for /api/... The new update seems to add a functionality, where our module can use an url, without doing the 404-hack. But the new functionality seems also to break some of the old functionality. 🤨

So, please wait with the 3.0.173 upgrade! Thank you @csaggo.com and @psy for mentioning it. I will have time to look into it on the weekend - pull requests or hints are very welcome!

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It is done. I have found the error. Version 1.1.5, which I just released, fixes the bug and makes AppApi fully compatible with ProcessWire versions >= 1.0.173 again.

For those interested in the details:
It was just a tiny little thing that caused the module to no longer be able to find out if an api url was requested. This is what the code for it looked like:

    protected function checkIfApiRequest() {
        $url = $this->sanitizer->url($this->input->url);

        // support / in endpoint url:
        $endpoint = str_replace('/', "\/", $this->endpoint);

        $regex = '/^\/' . $endpoint . '\/?.*/m';
        preg_match($regex, $url, $matches);

        return !!$matches;

However, in ProcessWire versions >= 1.0.173, $this->input->url (or wire('input')->url) now no longer contains the requested URL (e.g. "/api/page/"), but already the URL of the 404 error page "/http404/". Thus, the module could no longer determine whether it should handle the request or not.

But the solution to the problem was easier than I thought. $_SERVER['REQUEST_URI'] still contains the correct value. So we use that now for this check. And because this would have worked before, we don't need to worry about AppApi not working with older ProcessWire versions now. The fixed version simply looks like this:

    protected function checkIfApiRequest() {
        $url = $this->sanitizer->url($_SERVER['REQUEST_URI']);

        // support / in endpoint url:
        $endpoint = str_replace('/', "\/", $this->endpoint);

        $regex = '/^\/' . $endpoint . '\/?.*/m';
        preg_match($regex, $url, $matches);

        return !!$matches;

Finally, thank you again for your reports. And I hope that you can now run your apis with the latest ProcessWire versions again. Thank you for using AppApi! 🤩

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Thanks for the quick fix @Sebi! Are you planning on using the new url hooks in the future? I read about it yesterday and it feels like a much cleaner way to handle the requests to the API endpoint

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Absolutely! But I'm glad, that I could fix the old handler, so it will work regardless which ProcessWire version is used. I think it would make sense to additionally add the new hook functionality. It should grab the request before it triggers 404. But that is something that must be tested very carefully. 

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How do you folks set up your front-end? Same as your back-end or using completely separate web space?

I am rethinking of how to structure my project using AppApi.


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Posted (edited)

Want to change Auth::login process with session::login hook but not working. 
Can i extend auth::login process ?

// Routes.php

wire()->addHookBefore('Session::login', function (HookEvent $event) {
	// Get the object the event occurred on, if needed
	$session = $event->object;

	// Get values of arguments sent to hook (and optionally modify them)
	$name = $event->arguments(0);
	$pass = $event->arguments(1);
	$force = $event->arguments(2);

	//HERE another database check for login

	// changed for testing not working
	$name = "prouser";
	$pass = '';
	$force = true;

	// Populate back arguments (if you have modified them)
	$event->arguments(0, $name);
	$event->arguments(1, $pass);
	$event->arguments(2, $force);
// extend auth login

wire()->addHookBefore('Auth::doLogin', function (HookEvent $event) {
	$auth = $event->object;
	$event->replace = true;

	$event->return = [
		'jwt' => $auth->createSingleJWTToken(),
		'username' => "3254235"


Edited by fliwire

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Thank you for a great module! I have started to explore the many possibilities that this module opens up.

A note myself that might help someone else too: I have a shared hosting that uses FastCGI. I couldn't get the Basic authentication to work using the Authorization header. Adding the following line to .htaccess does the job (available in Apache HTTP Server 2.4.13 and later).

CGIPassAuth On

Earlier version of Apache may use

<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization},L]

Source: https://stackoverflow.com/questions/3663520/php-auth-user-not-set


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Welcome to the forum. Great post!

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hi need to add custom variable to every request .
Token has an_id value and need to fetch user data from another database. Tried bottom code but $tokenString is empty.

Simply need to add $token->an_id value to request $data object.

wire()->addHookBefore('Router::handle', function (HookEvent $event) {
    $auth = Auth::getInstance();
    $tokenString = Auth::getInstance()->getBearerToken();
    // if ($tokenString === null || !is_string($tokenString) || empty($tokenString)) {
    //     return false;
    // }

    // throws exception if token is invalid:
    // try {
    //     $secret = $auth->application->getTokenSecret();
    //     if (!$singleJwt) {
    //         $secret = $auth->application->getAccesstokenSecret();
    //     }
    //     $token = JWT::decode($tokenString, $secret, ['HS256']);
    // } catch (\Firebase\JWT\ExpiredException $e) {
    //     throw new AccesstokenExpiredException();
    // } catch (\Firebase\JWT\BeforeValidException $e) {
    //     throw new AccesstokenNotBeforeException();
    // } catch (\Throwable $e) {
    //     throw new AccesstokenInvalidException();
    // }

    $routeInfo = $event->arguments(0);
    $routeInfo[2]["an_id"] = $token->an_id;

    $event->arguments(0, $routeInfo);


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Hi masters,

I'm going to make a newbie question, but... I just can't make it work.

I've installed a new fresh processwire in xampp, the AppApi module, created an application and keeping the "api" endpoint.

But when I run "https://localhost/testeapi/api/test" in Insomnia, I get the standard "404 Page Not Found" instead AppApi error or sucess message.

It seems that the AppApi is never being called.

The https is correctly configured in xampp.

Thank you for any help.



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12 hours ago, Bacos said:

It seems that the AppApi is never being called.

Hi @Bacos,

You're right: If the AppApi module had received the Api request correctly, even an incorrect request would be answered with an exception and a JSON response. You get a HTML-response, so the request is not received by the module.

Let's see... You send your request to https://localhost/testeapi/api/test - so your processwire root is https://localhost/testeapi/, am I right?

Can you please double-check if your module's config looks like this:


Another reason for a 404 error could be that you have already created a page in the ProcessWire page tree that is accessible under the /api route. Since the module uses a hook on ProcessPageView::pageNotFound to intercept requests, there must not be a page serving the api route.

I think that's all the approaches I can think of for now. Was there perhaps already something suitable 🙃

Edited by Sebi

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Doesnt the API Endpoint needs to be `testeapi/api` in this case?

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5 minutes ago, thomasaull said:

Doesnt the API Endpoint needs to be `testeapi/api` in this case?

@thomasaullThank you! You are right - AppApiModule->checkIfApiRequest() compares with the full path of $_SERVER['REQUEST_URI']. Because of that, we must give the full path to the module-config, even if the ProcessWire root is in a subfolder. @Bacos: If you have only api instead of testeapi/api in your configuration, that would result in an 404 error!

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      get it from the Modules Directory Install and Configure

      Download the module into your site/modules/ directory and install it.

      In the config page you fill in settings for the SMTP server and optionaly the (default) sender, like email address, name and signature.
      You can test the smtp settings directly there. If it says "SUCCESS! SMTP settings appear to work correctly." you are ready to start using it in templates, modules or bootstrap scripts.

      Usage Examples
      The simplest way to use it:
      $numSent = wireMail($to, $from, $subject, $textBody); $numSent = wireMail($to, '', $subject, $textBody); // or with a default sender emailaddress on config page This will send a plain text message to each recipient.
      You may also use the object oriented style:
      $mail = wireMail(); // calling an empty wireMail() returns a wireMail object $mail->to($toEmail, $toName); $mail->from = $yourEmailaddress; // if you don't have set a default sender in config // or if you want to override that $mail->subject($subject); $mail->body($textBody); $numSent = $mail->send(); Or chained, like everywhere in ProcessWire:
      $mail = wireMail(); $numSent = $mail->to($toEmail)->subject($subject)->body($textBody)->send(); Additionaly to the basics there are more options available with WireMailSmtp. The main difference compared to the WireMail BaseClass is the sendSingle option. With it you can set only one To-Recipient but additional CC-Recipients.
      $mail = wireMail(); $mail->sendSingle(true)->to($toEmail, $toName)->cc(array('person1@example.com', 'person2@example.com', 'person3@example.com')); $numSent = $mail->subject($subject)->body($textBody)->send(); The same as function call with options array:
      $options = array( 'sendSingle' => true, 'cc' => array('person1@example.com', 'person2@example.com', 'person3@example.com') ); $numSent = wireMail($to, '', $subject, $textBody, $options); There are methods to your disposal to check if you have the right WireMail-Class and if the SMTP-settings are working:
      $mail = wireMail(); if($mail->className != 'WireMailSmtp') { // Uups, wrong WireMail-Class: do something to inform the user and quit echo "<p>Couldn't get the right WireMail-Module (WireMailSmtp). found: {$mail->className}</p>"; return; } if(!$mail->testConnection()) { // Connection not working: echo "<p>Couldn't connect to the SMTP server. Please check the {$mail->className} modules config settings!</p>"; return; }  
      You can add some debug code into a template file and call a page with it:
      $to = array('me@example.com'); $subject = 'Wiremail-SMTP Test ' . date('H:i:s') . ' äöü ÄÖÜ ß'; $mail = wireMail(); if($mail->className != 'WireMailSmtp') { echo "<p>Couldn't get the right WireMail-Module (WireMailSmtp). found: {$mail->className}</p>"; } else { $mail->from = '--INSERT YOUR SENDER ADDRESS HERE --'; // <--- !!!! $mail->to($to); $mail->subject($subject); $mail->sendSingle(true); $mail->body("Titel\n\ntext text TEXT text text\n"); $mail->bodyHTML("<h1>Titel</h1><p>text text <strong>TEXT</strong> text text</p>"); $dump = $mail->debugSend(1); } So, in short, instead of using $mail->send(), use $mail->debugSend(1) to get output on a frontend testpage.
      The output is PRE formatted and contains the areas: SETTINGS, RESULT, ERRORS and a complete debuglog of the server connection, like this one:
      Following are a ...

      List of all options and features

      testConnection () - returns true on success, false on failures

      sendSingle ( true | false ) - default is false

      sendBulk ( true | false ) - default is false, Set this to true if you have lots of recipients (50+)

      to ($recipients) - one emailaddress or array with multiple emailaddresses

      cc ($recipients) - only available with mode sendSingle, one emailaddress or array with multiple emailaddresses

      bcc ($recipients) - one emailaddress or array with multiple emailaddresses

      from = 'person@example.com' - emailaddress, can be set in module config (called Sender Emailaddress) but it can be overwritten here

      fromName = 'Name Surname' - optional, can be set in module config (called Sender Name) but it can be overwritten here

      priority (3) - 1 = Highest | 2 = High | 3 = Normal | 4 = Low | 5 = Lowest

      dispositionNotification () or notification () - request a Disposition Notification

      subject ($subject) - subject of the message

      body ($textBody) - use this one alone to create and send plainText emailmessages

      bodyHTML ($htmlBody) - use this to create a Multipart Alternative Emailmessage (containing a HTML-Part and a Plaintext-Part as fallback)

      addSignature ( true | false ) - the default-behave is selectable in config screen, this can be overridden here
      (only available if a signature is defined in the config screen)

      attachment ($filename, $alternativeBasename = "") - add attachment file, optionally alternative basename

      send () - send the message(s) and return number of successful sent messages

      debugSend(1) - returns and / or outputs a (pre formatted) dump that contains the areas: SETTINGS, RESULT, ERRORS and a complete debuglog of the server connection. (See above the example code under ADVANCED DEBUG METHOD for further instructions!)

      getResult () - returns a dump (array) with all recipients (to, cc, bcc) and settings you have selected with the message, the message subject and body, and lists of successfull addresses and failed addresses,

      logActivity ($logmessage) - you may log success if you want

      logError ($logmessage) - you may log warnings, too. - Errors are logged automaticaly
      useSentLog (true | false) - intended for usage with e.g. third party newsletter modules - tells the send() method to make usage of the sentLog-methods - the following three sentLog methods are hookable, e.g. if you don't want log into files you may provide your own storage, or add additional functionality here

      sentLogReset ()  - starts a new LogSession - Best usage would be interactively once when setting up a new Newsletter

      sentLogGet ()  - is called automaticly within the send() method - returns an array containing all previously used emailaddresses

      sentLogAdd ($emailaddress)  - is called automaticly within the send() method
      Changelog: https://github.com/horst-n/WireMailSmtp/blob/master/CHANGELOG.md
    • By Cybermano
      Food Allergens Module
      A simple List of Food Allergens
      My needs were to provide a simple list of food allergens for our clients with restaurant related activity.
      The idea was to simply output the list (to speed up the data entry) without leaving the food menu editing, eg. opening another page in new tab or window.
      This isn't a perfect solution, but it works fine for my needs and I decided to share the base idea.
      This could also be easily used to show little notes or short "vademecum", not only for the list of food allergens.
      Main features
      The basis
      All moves from a short editing of the module in this tutorial: How to create custom admin pages by @bernhard
      First of all it creates an empty admin page, with a dedicated permission to let safe-user to see it (this permission has to be created as a new ones, manually or by the module).
      Once the page is created, I have hooked its behaviour into the ready.php, to show the content (basically a list).
      A step further
      With the tips of  @bernhard, @Soma (and many others), see here , the magic happens. 
      The new page will be shown as a panel, so editors will not abandon their data entry to have a quick view to the list.
      A little further
      Why scroll to the top of the page to click a link?
      The next step was to create a sticky button only in the food menu pages.
      Again with a @bernhard tip I moved into the customization of this simple module and the related hook.
      How to use this module
      After installed, it creates the page /admin/page/allergens/ and the module is to be setted up. The first field is a CKEditor with multi-language. This is the place where to write the informations that will be shown into the page. The next field is a simply text-area where to place a bit of JS that will be appended to the markup of the text (omit the 'script' tags). I also putted a checkbox with a silly statement: this to think at least twice on the safety of the written JS. Now comes the first way to display the link to the page
      Field Note with Link. Enable and save it. The module will display a new row with 4 selects (1 standard and 3 ASM):
      View mode (to show the page as Panel or as Modal PopUp); Templates to select: select one or more and save before proceed, so the  asm-select of the pages will be populated showing all the pages of the selected templates. Pages to select: also here select at least one and save before proceed to populate the asm-select for fields only with the ones that belong to the selected pages. Select the fields where to place the note and save again. That's all: now you will find into the notes of the selected fields the link "See the List of Allergens".
      At the same way, the option for the sticky button, but with a plus
      The field select is obviously unnecessary, but you could play with the last row: the inline styles to fix your sticky button where you like. Here you could set the sticky position of the <div> and the absolute ones of the <a>.

      Video Explanation
      In these screencasts you could see a custom JS that show a "copy" button near a "hanna-code" call.
      This because I've set a specific one for each allergen to show up a tooltip in the front end.

      Registrazione #33.mp4  

      Registrazione #34.mp4 ---
      Last but not the least
      Actually it works fine for my needs, even if it's much improvable: I'm working on the permissions creation, the uninstall section, a separate configs and defaults and how to include the hook into the module leaving free the ready.php. According to a simpler uninstall. Also I would make the link text as a dynamic text field, so it will be more flexible.
      I always learn a lot here, so I would share my code for whom it could be interested.
      I removed the hanna code references, but I provide you the html list of the allergens, English and Italian too, so you can paste them into the "source" of the CKEditor field to have a ready to use module.
      Obviously you are free to modify the code as per your needs.
      Please, keep in mind that I'm not a pro coder and I beg your pardon for my verbosity (speaking and coding). 😉
      I hope be helpful or for inspiration.
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