Update config program to accommodate multiple signers (#4946)

* Update config program to accommodate multiple signers

* Update install CLI

* Remove account_type u32; add handling for unsigned keys in list

* ConfigKeys doc

programs/config_api/src/config_instruction.rs

@@ -1,26 +1,56 @@
 use crate::id;
 use crate::ConfigState;
+use bincode::serialize;
+use serde_derive::{Deserialize, Serialize};
 use solana_sdk::instruction::{AccountMeta, Instruction};
 use solana_sdk::pubkey::Pubkey;
+use solana_sdk::short_vec;
 use solana_sdk::system_instruction;
 
+/// A collection of keys to be stored in Config account data.
+#[derive(Debug, Default, Deserialize, Serialize)]
+pub struct ConfigKeys {
+    // Each key tuple comprises a unique `Pubkey` identifier,
+    // and `bool` whether that key is a signer of the data
+    #[serde(with = "short_vec")]
+    pub keys: Vec<(Pubkey, bool)>,
+}
+
+impl ConfigKeys {
+    pub fn serialized_size(keys: Vec<(Pubkey, bool)>) -> usize {
+        serialize(&ConfigKeys { keys })
+            .unwrap_or_else(|_| vec![])
+            .len()
+    }
+}
+
 /// Create a new, empty configuration account
 pub fn create_account<T: ConfigState>(
     from_account_pubkey: &Pubkey,
     config_account_pubkey: &Pubkey,
     lamports: u64,
+    keys: Vec<(Pubkey, bool)>,
 ) -> Instruction {
+    let space = T::max_space() + ConfigKeys::serialized_size(keys) as u64;
     system_instruction::create_account(
         from_account_pubkey,
         config_account_pubkey,
         lamports,
-        T::max_space(),
+        space,
         &id(),
     )
 }
 
 /// Store new data in a configuration account
-pub fn store<T: ConfigState>(config_account_pubkey: &Pubkey, data: &T) -> Instruction {
-    let account_metas = vec![AccountMeta::new(*config_account_pubkey, true)];
-    Instruction::new(id(), data, account_metas)
+pub fn store<T: ConfigState>(
+    config_account_pubkey: &Pubkey,
+    keys: Vec<(Pubkey, bool)>,
+    data: &T,
+) -> Instruction {
+    let mut account_metas = vec![AccountMeta::new(*config_account_pubkey, true)];
+    for (signer_pubkey, _) in keys.iter().filter(|(_, is_signer)| *is_signer) {
+        account_metas.push(AccountMeta::new(*signer_pubkey, true));
+    }
+    let account_data = (ConfigKeys { keys }, data);
+    Instruction::new(id(), &account_data, account_metas)
 }