Modify server authentication logic

export function getLoginRoute() {
    return async function login(
        req: Request<{ email: string; password: string; }>,
        res: Response,
    ): Promise<Response<{ sessionId: string } | undefined>> {
        const fields = req.body ?? {}
        ensureValidArgs(fields)

        const providerId = createProviderId("email", fields.email)
        const authIdentity = await findAuthIdentity(providerId)
        if (!authIdentity) {
            throw createInvalidCredentialsError()
        }
        const providerData = getProviderDataWithPassword<'email'>(authIdentity.providerData)
        if (!providerData.isEmailVerified) {
            throw createInvalidCredentialsError() // CAN THIS BE CHANGED
        }
        try {
            await verifyPassword(providerData.hashedPassword, fields.password);
        } catch(e) {
            throw createInvalidCredentialsError()
        }