Added support to block/unblock contacts and receive block/unblock events

[emacielxp]

Block/Unblock support

Added support to block/unblock contacts and receive block/unblock events

Changes:

connectionevents.go

• Sync at local cache the blocked list when successfully connect

mdtest/main.go

• Included commands to test the block/unblock feature:
  -- listblocked: get the blocked list from whatsapp
  -- block: block contact
  -- unblock: unblock contact

• Included contact blocked status changed event listener

send.go

• Included validation at SendMessage function if the contact is blocked to not send message for a blocked contact

notification.go

• Included function to handle the whatsapp block/unblock event changes

types/events/events.go

• Created the contact blocked status changed event type definition

user.go

• Created necessary functions to allow cache, block and unblock contacts

Notes:

we are using this version at production environment with more than 400 whatsapps connected and all works fine

this feature was already tested and works fine at:

• iphone business
• iphone normal
• android business
• android normal

[mateusfmello]

Excellent modifications, I tested it and everything seems to be perfect.

I only wonder about the project standards.

In mdtest the commands pin, mute, archive, presence etc. are a single command varying the arguments, for "pinned" or "unpinned", "muted" or "unmuted" etc., I believe that the "block" command should follow this same pattern, thus saving code, simplifying the project and maintaining the standard that has been implemented.

I suggest the command would be like this:

block <jid> <action>

Where "action" is a boolean.

The code would look like this:

• Would delete the "unblock" command;

Block command:

// /mdtest/main.go
case "block":
	if len(args) < 2 {
		log.Errorf("Usage: block <jid> <action>")
		return
	}
	target, ok := parseJID(args[0])
	if !ok {
		return
	}
	action, err := strconv.ParseBool(args[1])
	if err != nil {
		log.Errorf("invalid second argument: %v", err)
		return
	}

	blockedList, err := cli.BuildBlockContact(target, action)
	if err != nil {
		log.Errorf("Error blocking contact: %v", err)
	}

	log.Infof("%+v", blockedList)
}

In "/user.go"

• Delete the UnblockContact and BlockContact methods

Create the BuildBlockContact method, which would be like this:

// BuildBlockCSe vontact updates the contact blocked status to false or true
func (cli *Client) BuildBlockContact(user types.JID, block bool) ([]types.JID, error) {
	blockedList, err := cli.setContactBlockedStatus(user, block)
	if err != nil {
		return nil, err
	}

	return blockedList, nil
}

@emacielxp if you like this idea I can make a PR for you if you prefer it that way.