Workflow script called multiple times

Steps to reproduce

Context: I'm wanting to create a script to automatically convert videos. I wasn't seeing my script get triggered so I added 2 workflows for testing and had the script just log information when I noticed odd behavior. This is what I found.

1. Install a vanilla nextcloud/vm instance of NextCloud
2. Enable Workflow
3. Add a workflow script on file upload (i.e. creation):
   • When: File Created
   • and User group membership is member of Users
   • Run script: nc_video_converter upload %e %n %f
     4.Add a workflow script on tag:
   • When: Tag assigned
   • and User group membership is member of Users
   • Run script: nc_video_converter tag %e %n %f
4. Create a nc_video_converter script on the server
   • sudo vim /usr/bin/nc_video_converter

     #!/bin/bash
     echo "Running converter..." >> /var/log/nc_video_converter
     echo "$@" >> /var/log/nc_video_converter
     

   • sudo chmod +x /usr/bin/nc_video_converter
   • (not sure if this is needed?) sudo chown www-data:www-data /usr/bin/nc_video_converter
5. Create a user assigned to the Users group
6. Login as that user and upload a file
7. Notice the /var/log/nc_video_converter file shows:

   Running converter...
   tag OCP\SystemTag\ISystemTagObjectMapper::assignTags /myusername/files/Screen Shot 2020-04-02 at 4.02.43 PM.png /tmp/oc_tmp_6Z7GGl-.png
   Running converter...
   upload OCP\SystemTag\ISystemTagObjectMapper::assignTags /myusername/files/Screen Shot 2020-04-02 at 4.02.43 PM.png /tmp/oc_tmp_XjOYL4-.png
   

8. Add a tag to a file
9. Notice the /var/log/nc_video_converter file shows:

   Running converter...
   tag \OCP\Files::postCreate /myusername/files/Screen Shot 2020-04-02 at 4.02.33 PM.png /tmp/oc_tmp_Jd9L2p-.png
   Running converter...
   upload \OCP\Files::postCreate /myusername/files/Screen Shot 2020-04-02 at 4.02.33 PM.png /tmp/oc_tmp_5evyop-.png
   

Expected behaviour

I expect that when I upload a file that only the workflow for the file upload would be triggered.

I expect that when I tag a file that only the workflow for the tag would be triggered.

Actual behaviour

When I upload a file both the file upload AND the tag workflows were triggered. Interestingly, though, you can see that both workflows printed the same event name: OCP\SystemTag\ISystemTagObjectMapper::assignTags.

When I tag a file both both workflows were triggered. Interestingly, both workflows printed the same event name \OCP\Files::postCreate.

Workflow Script app

Workflow Script app version: 1.3.1

Server configuration

Operating system: Ubuntu 18.04 LTS (Linux ubuntu-bionic 4.15.0-91-generic)

Web server: Apache

Database: PostgreSQL

PHP version: PHP 7.2.24-0ubuntu0.18.04.3 (cli)

Nextcloud Version: 18.0.3

Where did you install Nextcloud from: github.com/nextcloud/vm using the virtualbox example

Signing status:

No errors have been found.

List of activated apps:

Enabled:
  - accessibility: 1.4.0
  - activity: 2.11.0
  - admin_audit: 1.8.0
  - cloud_federation_api: 1.1.0
  - comments: 1.8.0
  - dav: 1.14.0
  - federatedfilesharing: 1.8.0
  - federation: 1.8.0
  - files: 1.13.1
  - files_pdfviewer: 1.7.0
  - files_rightclick: 0.15.2
  - files_sharing: 1.10.1
  - files_trashbin: 1.8.0
  - files_versions: 1.11.0
  - files_videoplayer: 1.7.0
  - firstrunwizard: 2.7.0
  - logreader: 2.3.0
  - lookup_server_connector: 1.6.0
  - nextcloud_announcements: 1.7.0
  - notifications: 2.6.0
  - oauth2: 1.6.0
  - password_policy: 1.8.0
  - photos: 1.0.0
  - privacy: 1.2.0
  - provisioning_api: 1.8.0
  - recommendations: 0.6.0
  - serverinfo: 1.8.0
  - settings: 1.0.0
  - sharebymail: 1.8.0
  - support: 1.1.0
  - survey_client: 1.6.0
  - systemtags: 1.8.0
  - text: 2.0.0
  - theming: 1.9.0
  - twofactor_backupcodes: 1.7.0
  - updatenotification: 1.8.0
  - video_converter: 0.1.3
  - viewer: 1.2.0
  - workflow_script: 1.3.1
  - workflowengine: 2.0.0
Disabled:
  - encryption
  - files_external
  - user_ldap

Nextcloud configuration:

</details>

**Are you using external storage, if yes which one:** local/smb/sftp/...

**Are you using encryption:** yes/no

### Server log (data/nextcloud.log)
<details>

</details>

まず、ここで説明されている2つのワークフロー設定と /usr/bin/nc_video_converter スクリプトを使用して、workflow_script 1.3.1 と workflowengine 2.0.0 のアプリで問題を再現します。ファイル作成とタグ割り当てについて報告された OCP イベント名を追跡します。完了の条件は、アップロードとタグ付けがそれぞれ対応するワークフローだけを正しいイベントでトリガーすることです。