Vapid/WebPush Support

[caronc]

Description:

Related issue (if applicable): #1009

This is very much a work in progress

Account Setup

Vapid/WebPush requires a subscriptions.json file that identifies all of the users you wish to notify and a private_key.pem

Syntax:

• vapid://subscription_id/
• vapid://subscription_id/target
• vapid://subscription_id/target1/target2/targetN/

Parameter Breakdown

Variable	Required	Description
keyfile	Yes	A private key in PEM format belonging to the account associated with the subscription_id
subfile	Yes	A subscriptions.json file identifying the configuration you wish to reference.

New Service Completion Status

• apprise/plugins/vapid
• KEYWORDS
  • add new service into this file (alphabetically).
• README.md
  • add entry for new service to table (as a quick reference)
• packaging/redhat/python-apprise.spec
  • add new service into the %global common_description

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@1009-webpush-support

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  "vapid://subscriber_id"