It really doesnt matter whether Hamas of the Palestinian Authority represents the Palestinians. Both groups seek the destruction of Israel with as many Jews as possible, and both promote the goal of one Palestine, from the river to the sea. The only difference is that the PA seeks negotiations to improve their position before resorting to terror, and Hamas eschews the use of negotiations. All agreements between Israel and either the PA or Hamas will be hudnas, or temporary truces. The Palestinian national identity is defined as conflict with Jews, so there can be no end of conflict agreement.
U.S., allies conduct 31 air strikes in Syria and Iraq against ISIS militants (Reuters)
from the article: Israel is helping the rise of Hamas