I should be working...

Cargo.lock

@@ -13,6 +13,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -144,8 +153,11 @@ version = "0.1.0"
 dependencies = [
  "clap",
  "clap-verbosity-flag",
+ "hex",
  "home",
+ "lazy_static",
  "log",
+ "regex",
  "resource",
  "rusqlite",
  "serde",
@@ -220,6 +232,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
 [[package]]
 name = "home"
 version = "0.5.4"
@@ -267,6 +285,12 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
 [[package]]
 name = "num_threads"
 version = "0.1.6"
@@ -336,6 +360,23 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e076559ef8e241f2ae3479e36f97bd5741c0330689e217ad51ce2c76808b868a"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
+
 [[package]]
 name = "resource"
 version = "0.5.0"

Cargo.toml

@@ -16,3 +16,6 @@ home = "0.5.4"
 sha2 = "0.10.6"
 serde_json = "1.0"
 resource = "0.5.0"
+hex = "0.4.3"
+regex = "1.7.0"
+lazy_static = "1.4.0"

src/db/_cheques.rs

@@ -0,0 +1,21 @@
+use crate::db::_external_id::ExternalId;
+
+pub struct SecurityEmitterCheque {
+    drawer_user_id: ExternalId,
+    security_id: ExternalId,
+    cheque_number: u32,
+    amount: u32,
+}
+
+impl Cheque {
+    pub fn is_valid(self: &Cheque) -> bool {
+        return true;
+    }
+
+
+    pub fn cash_cheque(&self){
+
+    }
+
+
+}

src/db/_external_id.rs

@@ -0,0 +1,151 @@
+use std::io::Read;
+
+use regex::{Captures, Regex};
+
+
+#[derive(PartialEq, Debug)]
+struct SafeId {
+    encrypted_id: [u8; 4],
+    signature: [u8; 4],
+}
+
+#[derive(PartialEq, Debug)]
+pub enum ExternalId {
+    AccountId(SafeId),
+    UserId(SafeId),
+    SecurityId(SafeId),
+}
+
+impl ToString for SafeId {
+    fn to_string(&self) -> String {
+        format!("{}-{}", hex::encode(self.encrypted_id), hex::encode(self.signature))
+    }
+}
+
+fn deserialize_str(s: &str) -> Option<[u8; 4]> {
+    let mut encrypted_id_bytes = [0u8; 4];
+    let r = hex::decode_to_slice(s, &mut encrypted_id_bytes as &mut [u8]);
+    return match r {
+        Ok(_) => Some(encrypted_id_bytes),
+        Err(_) => None
+    };
+}
+
+impl SafeId {
+    fn from_regex_captures(caps: &Captures) -> Option<SafeId> {
+        let encrypted_id = caps.name("id")?;
+        let signature = caps.name("sign")?;
+
+        Some(SafeId {
+            encrypted_id: deserialize_str(&encrypted_id.as_str())?,
+            signature: deserialize_str(&signature.as_str())?,
+        })
+    }
+
+    pub fn from_string(s: &String) -> Option<SafeId> {
+        let external_id_pattern = Regex::new(r"^(?P<id>\w+)-(?P<sign>\w+)$").unwrap();
+        let caps = external_id_pattern.captures(&s)?;
+        return Self::from_regex_captures(&caps);
+    }
+
+    pub fn from_id(id: u32) -> SafeId {
+        let bytes = u32::to_be_bytes(id);
+        SafeId {
+            encrypted_id: bytes,
+            signature: bytes,
+        }
+    }
+
+    pub fn get_id(&self) -> u32 {
+        return u32::from_be_bytes(self.encrypted_id);
+    }
+}
+
+
+impl ToString for ExternalId {
+    fn to_string(&self) -> String {
+        match self {
+            ExternalId::UserId(sid) => format!("a-{}", sid.to_string()),
+            ExternalId::AccountId(sid) => format!("u-{}", sid.to_string()),
+            ExternalId::SecurityId(sid) => format!("s-{}", sid.to_string()),
+        }
+    }
+}
+
+
+impl ExternalId {
+    pub fn from_string(s: &String) -> Option<ExternalId> {
+        let pattern = Regex::new(r"^(?P<type>\w)-(?P<id>\w+)-(?P<sign>\w+)$").unwrap();
+        let caps = pattern.captures(&s)?;
+
+        match caps.name("type")?.as_str() {
+            "a" => Some(ExternalId::AccountId(SafeId::from_regex_captures(&caps)?)),
+            "u" => Some(ExternalId::UserId(SafeId::from_regex_captures(&caps)?)),
+            "s" => Some(ExternalId::SecurityId(SafeId::from_regex_captures(&caps)?)),
+            _ => None
+        }
+    }
+
+    pub fn get_id(&self) -> u32 {
+        match self {
+            ExternalId::UserId(x) => x.get_id(),
+            ExternalId::AccountId(x) => x.get_id(),
+            ExternalId::SecurityId(x) => x.get_id(),
+        }
+    }
+}
+
+
+pub mod test_util {
+    use std::any::Any;
+
+    use super::*;
+
+
+    #[test]
+    fn safe_id_happy_path_1() {
+        let sid = SafeId { encrypted_id: [1, 2, 3, 4], signature: [7, 8, 9, 10] };
+        assert_eq!("01020304-0708090a".to_string(), sid.to_string());
+        let deserialized_eid = SafeId::from_string(&sid.to_string()).unwrap();
+        assert_eq!(sid, deserialized_eid);
+    }
+
+    #[test]
+    fn safe_id_happy_path_2() {
+        let sid = SafeId::from_id(56);
+        assert_eq!("00000038-00000038".to_string(), sid.to_string());
+        let deserialized_eid = SafeId::from_string(&sid.to_string()).unwrap();
+        assert_eq!(sid, deserialized_eid);
+        assert_eq!(56, deserialized_eid.get_id());
+    }
+
+    #[test]
+    fn safe_id_un_happy_path() {
+        let bad_strings = vec!["a", "a-b", "01020304-0708090É"];
+        for bad_string in bad_strings.iter() {
+            let ret = SafeId::from_string(&bad_string.to_string());
+            assert!(ret.is_none(), "This should not be a valid safe id: {}", bad_string);
+        }
+    }
+
+    #[test]
+    fn external_id_simple_test() {
+        let eid = ExternalId::from_string(&"u-01020304-0708090a".to_string()).unwrap();
+        assert!(match eid {
+            ExternalId::UserId(_) => true,
+            _ => false
+        });
+
+        let eid = ExternalId::from_string(&"a-01020304-0708090a".to_string()).unwrap();
+        assert!(match eid {
+            ExternalId::AccountId(_) => true,
+            _ => false
+        });
+
+        let eid = ExternalId::from_string(&"s-01020304-0708090a".to_string()).unwrap();
+        assert!(match eid {
+            ExternalId::SecurityId(_) => true,
+            _ => false
+        });
+    }
+}

src/db/mod.rs

@@ -1,16 +1,21 @@
 mod _users;
 mod _securities;
 mod _accounts;
+mod _cheques;
+mod _external_id;
 
 pub mod securities{
     pub use super::_securities::{list_securities, get_security_by_id, Security};
-
 }
 
-pub mod users{
+pub mod users {
     pub use super::_users::{create_user, list_users, User};
 }
 
 pub mod accounts {
     pub use super::_accounts::{get_account_by_id, list_accounts, create_account, Account};
 }
+
+pub mod cheques {
+    pub use super::_cheques::{Cheque};
+}

src/services/_transactions.rs

@@ -1,9 +1,20 @@
 use rusqlite::{Transaction, Result};
 use crate::db::accounts::get_account_by_id;
+use crate::db::cheques::Cheque;
 use crate::db::securities::get_security_by_id;
 
-fn update_account(tx: & Transaction, account_id: u32) -> Result<()>{
+
+
+fn cash_cheque(cheque: &Cheque) -> Result<()> {
+    if !cheque.is_valid() {
+
+
+    }
+    Ok(())
+}
+
+fn update_account(tx: &Transaction, account_id: u32) -> Result<()> {
     let account = get_account_by_id(tx, account_id)?;
     // let sec = get_security_by_id(tx, account.)
-    return Ok(())
+    return Ok(());
 }