add feed validations (#7)

* add fee validations

* fix declare_id!

programs/oracle/src/lib.rs

@@ -9,6 +9,7 @@ pub mod oracle {
 
  pub fn create_oracle(ctx: Context<CreateOracle>, _oracle_id: i64) -> Result<()> {
  let timestamp = Clock::get()?.unix_timestamp;
+
  ctx.accounts.oracle_item.authority = ctx.accounts.oracle_authorizer.key();
  ctx.accounts.oracle_item.chainlink_feed = ctx.accounts.feed_account.key();
  ctx.accounts.oracle_item.started_at = timestamp;
@@ -127,7 +128,8 @@ pub struct CreateOracle<'info> {
  space = 8 + 32 + 32 + 8 + 8 + 8 + 1 + 16 + 1,
  seeds = [user.key().as_ref(), format!("id-{}", oracle_id).as_bytes().as_ref()], 
  bump,
- constraint = oracle_authorizer.authority == *user.key
+ constraint = oracle_authorizer.authority == *user.key,
+ constraint = chainlink_program.key() == *feed_account.to_account_info().owner
  )]
  oracle_item: Account<'info, OracleItem>,
  #[account(mut)]
@@ -144,7 +146,8 @@ pub struct CreateOracle<'info> {
 pub struct UpdateOracle<'info> {
  #[account(
  mut,
- constraint = oracle_item.authority == *oracle_authorizer.to_account_info().key
+ constraint = oracle_item.authority == *oracle_authorizer.to_account_info().key,
+ constraint = chainlink_program.key() == *feed_account.to_account_info().owner
  )]
  oracle_item: Account<'info, OracleItem>,
  #[account(mut)]