将 Solana 数据帐户设为只读

Question

I'm writing a program in Solana, I have to save data on the chain but make the data read only.

Right now I'm using anchor and I've wrote this:

    pub fn save_data(ctx: Context<SaveData>, content: String, actor: String) -> Result<()> {
        let service_account = &mut ctx.accounts.service_account;
        let data_account = &mut ctx.accounts.data_account;
        let company_account = &mut ctx.accounts.company_account;
        let authority = &mut ctx.accounts.authority;

        data_account.content = content;
        data_account.actor = actor;
        data_account.company = company_account.key();
        data_account.authority = authority.key();
        data_account.pre_data_key = service_account.current_data_key;

        service_account.current_data_key = data_account.key();

        Ok(())
    }

#[derive(Accounts)]
pub struct SaveData<'info> {
    #[account(init, payer = authority, space = 8 + 50 + 32 + 32 + 32 + 32 )]
    pub data_account: Account<'info, DataState>,

    #[account(mut, has_one = authority)]
    pub company_account: Account<'info, CompanyState>,

    #[account(mut)]
    pub service_account: Account<'info, ServiceState>,

    #[account(mut)]
    pub authority: Signer<'info>,
    pub system_program: Program<'info, System>,
}

#[account]
pub struct DataState {
    content: String,
    actor: String,
    company: Pubkey,
    pub pre_data_key: Pubkey,
    pub authority: Pubkey,
}

I didn't implement any update or delete method but I would like to know if it would be possible to make the data content just read only.

Also, right now, if the creator of the dataAccount wants to update the data can update it outside of my smart contract?

Thanks

Answer 1

该帐户不能在您的合同之外更新，因为它是一个 PDA（程序派生帐户），并且只有您的程序可以通过您编写的指令对其进行修改，如果您想让它只读，您必须以这样的方式编写程序它不会改变帐户的数据（只是不做一个这样做的功能）