Add groupRevokeInvite, groupAcceptInvite and fix groupLeave (#860)

* Update groups.ts

* Fix: error TS2448: Block-scoped variable 'result' used before its declaration.

src/Socket/groups.ts

@@ -52,7 +52,7 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 			)
 			return extractGroupMetadata(result)
 		},
-		groupLeave: async(jid: string) => {
+		groupLeave: async(id: string) => {
 			await groupQuery(
 				'@g.us',
 				'set',
@@ -61,7 +61,7 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 						tag: 'leave',
 						attrs: { },
 						content: [
-							{ tag: 'group', attrs: { jid } }
+							{ tag: 'group', attrs: { id } }
 						]
 					}
 				]
@@ -124,6 +124,16 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 			const inviteNode = getBinaryNodeChild(result, 'invite')
 			return inviteNode.attrs.code
 		},
+	        groupRevokeInvite: async (jid: string) => {
+			const result = await groupQuery(jid, 'set', [{ tag: 'invite', attrs: {} }])
+			const inviteNode = getBinaryNodeChild(result, 'invite')
+			return inviteNode.attrs.code
+		},
+		groupAcceptInvite: async (code: string) => {
+			const results = await groupQuery('@g.us', 'set', [{ tag: 'invite', attrs: { code } }])
+			const result = getBinaryNodeChild(results, 'group')
+			return result.attrs.jid
+		},
 		groupToggleEphemeral: async(jid: string, ephemeralExpiration: number) => {
 			const content: BinaryNode = ephemeralExpiration ? 
 				{ tag: 'ephemeral', attrs: { ephemeral: ephemeralExpiration.toString() } } :
@@ -202,4 +212,4 @@ export const extractGroupMetadata = (result: BinaryNode) => {
 		ephemeralDuration: eph ? +eph : undefined
 	}
 	return metadata
-}
+}