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Example code of os2forms/os2forms_rest_api

Informations about the package os2forms_rest_api

OS2Forms REST API

We use Webform REST to expose a number of API endpoints.

Installation

Authentication

We use Key auth for authenticating api users.

A user can access the Webform REST API if

  1. it has the “OS2Form REST API user” (os2forms_rest_api_user) role,
  2. has been granted access to the form (see Custom access control )
  3. has a generated key (User > Edit > Key authentication; /user/«user id»/key-auth).

The “OS2Form REST API user” role gives read-only access to the API. To get write access, a user must also have the “OS2Form REST API user (write)” (os2forms_rest_api_user_write) role.

Endpoints

Name Path Methods
Webform Elements /webform_rest/{webform_id}/elements GET
Webform Fields /webform_rest/{webform_id}/fields GET
Webform Submission /webform_rest/{webform_id}/submission/{uuid} GET
Webform Submissions /webform_rest/{webform_id}/submissions GET
Webform Submit /webform_rest/submit POST
File /entity/file/{file_id} GET

Examples

Get file content from webform submission

Example uses some_webform_id as webform id, some_submission_id as submission id and dokumenter as the webform file element key.

Request:

Response:

Use the file endpoint from above to get information on a file, substituting {file_id} with the actual file id (some_document_id) from the previous request.

Request:

Response:

Finally, you can get the actual file by combining the base url with the url from above response:

Response:

The actual document content.

Submit webform

Request:

Response:

(the sid value is a webform submission uuid).

Webform submissions

You can filter results based on submission time by adding query parameters to the URL:

Name Value Example
starttime PHP Date and Time Formats yesterday
endtime PHP Date and Time Formats 2023-10-23

If left out, filtering upon the left out parameter will not be done.

This example requests all submissions on or after October 1st, 2023:

Request:

Response:

Custom access control

To give access to webforms, you need to specify a list of API users that are allowed to access a webform's data via the API.

Go to Settings > Access > View any submissions > Users to specify which users can access a webform's data.

Technical details

The custom access check is implemented in an event subscriber listening on the KernelEvents::REQUEST event. See EventSubscriber::onRequest for details.

In order to make documents accessible for api users the Key auth authentication_provider service has been overwritten to be global. See os2forms_rest_api.services.

Linked data

To make using the REST API easier we add linked data to GET responses:

Attachments

Attachment elements are added to GET responses:

Technical details on linked data and attachments

In order to add linked data, we apply a patch, webform_rest_submission.patch, to the Webform REST module and implement an event subscriber, WebformSubmissionDataEventSubscriber, to add the linked data.

All versions of os2forms_rest_api with dependencies

PHP Build Version
Package Version
Requires cweagans/composer-patches Version ^1.7
drupal/key_auth Version ^2.0
drupal/webform_rest Version ^4.1
os2forms/os2forms Version ^3.13 || ^4.0
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