Bunch of API prototypes

proto1.js

function receiveMessage(from, message, type) {
    var session = axolotl.getSession(from);
    // session could be in some sort of uninitalised state here - yuck!
    if (type === "PreKeyWhisperMessage") {
        return session.decryptPreKeyMessage(message);
    } else if (type === "WhisperMessage") {
        return session.decryptMessage(message);
    }
}

function sendMessage(to, message) {
    var session = axolotl.getSession(to);
    if (!session.isReady()) {
        var bundle = ...
        session.initialise(bundle);
    }
    return session.encryptMessage(message);
}

proto2.js

function receiveMessage(from, message, type) {
    var session = axolotl.getSession(from); // may return null.
    if (type === "PreKeyWhisperMessage") {
        if (!session) {
            session = axolotl.createSessionFromPreKeyWhisperMessage(from, message);
        }
        return session.decryptPreKeyMessage(message);
    } else if (type === "WhisperMessage") {
        if (!session) {
            throw new Error("No session");
        }
        return session.decryptMessage(message);
    }
}

function sendMessage(to, message) {
    var session = axolotl.getSession(to);
    if (!session) {
        var bundle = ...
        session = axolotl.createSessionFromPreKeyBundle(to, bundle);
    }
    session.encryptMessage(message);
}

proto3.js

function receiveMessage(from, message, type) {
    if (type === "PreKeyWhisperMessage") {
        return axolotl.decryptPreKeyMessage(from, message);
    } else if (type === "WhisperMessage") {
        return axolotl.decryptMessage(from, message);
    }
}

function sendMessage(to, message) {
    if (!axolotl.hasSession(to)) {
        var bundle = ...
        axolotl.createSessionFromPreKeyBundle(to, bundle);
    }
    return axolotl.encryptMessage(to, from);
}
// or
function sendMessage(to, message) {
    return axolotl.encryptMessage(to, from); // calls store.getPreKeyBundle(to)
}