From f12685e32689b620d6096ec91ba3a3f495342925 Mon Sep 17 00:00:00 2001
From: Yigit Sever
Date: Fri, 15 Apr 2022 19:01:40 +0300
Subject: [WIP] first part of lazy users overhaul

---
 Cargo.lock      | 41 +++++++++++++++++++++++++++++++++++++++++
 Cargo.toml      |  1 +
 src/db.rs       | 14 ++++++++++++++
 src/handlers.rs |  9 +++++----
 src/student.rs  |  7 ++++++-
 5 files changed, 67 insertions(+), 5 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 8228d5f..5a8a201 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -193,6 +193,18 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d696c370c750c948ada61c69a0ee2cbbb9c50b1019ddb86d9317157a99c2cae"
 
+[[package]]
+name = "bstr"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a40b47ad93e1a5404e6c18dec46b628214fee441c70f4ab5d6942142cc268a3d"
+dependencies = [
+ "lazy_static",
+ "memchr",
+ "regex-automata",
+ "serde",
+]
+
 [[package]]
 name = "buf_redux"
 version = "0.8.4"
@@ -293,6 +305,28 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "csv"
+version = "1.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22813a6dc45b335f9bade10bf7271dc477e81113e89eb251a0bc2a8a81c536e1"
+dependencies = [
+ "bstr",
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b2466559f260f48ad25fe6317b3c8dac77b5bdb5763ac7d9d6103530663bc90"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ctor"
 version = "0.1.20"
@@ -477,6 +511,7 @@ dependencies = [
  "blake2",
  "block-modes",
  "chrono",
+ "csv",
  "hex-literal",
  "jsonwebtoken",
  "lazy_static",
@@ -1300,6 +1335,12 @@ dependencies = [
  "regex-syntax",
 ]
 
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+
 [[package]]
 name = "regex-syntax"
 version = "0.6.23"
diff --git a/Cargo.toml b/Cargo.toml
index 77efd25..065cd84 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,6 +27,7 @@ sha2 = "0.9.3"
 block-modes = "0.7.0"
 aes = "0.6.0"
 askama = "0.10.5"
+csv = "1.1.6"
 
 [dev-dependencies]
 serde_test = "1.0.117"
diff --git a/src/db.rs b/src/db.rs
index bf094ab..fd5c1be 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -19,6 +19,7 @@ pub struct Db {
     pub blockchain: Arc<RwLock<Block>>,
     pub pending_transactions: Arc<RwLock<HashMap<Id, Transaction>>>,
     pub users: Arc<RwLock<HashMap<Fingerprint, User>>>,
+    approved_users: Vec<MetuId>,
     // TODO: metu_ids or approved_users or something, metu_id struct <11-04-22, yigit> //
 }
 
@@ -36,11 +37,13 @@ impl Db {
         }
 
         let users: HashMap<Fingerprint, User> = get_friendly_users();
+        let approved_users = read_approved_users();
 
         Db {
             blockchain: Arc::new(RwLock::new(Block::default())),
             pending_transactions: Arc::new(RwLock::new(HashMap::new())),
             users: Arc::new(RwLock::new(users)),
+            approved_users,
         }
     }
 
@@ -157,3 +160,14 @@ fn get_friendly_users() -> HashMap<Fingerprint, User> {
     );
     users
 }
+
+fn read_approved_users() -> Vec<MetuId> {
+    let mut approved_students: Vec<MetuId> = Vec::new();
+    let contents = fs::read_to_string("students.csv").unwrap();
+    let mut reader = csv::Reader::from_reader(contents.as_bytes());
+    for student in reader.records() {
+        let student = student.unwrap();
+        approved_students.push(MetuId::_new(student[0].to_owned(), student[1].to_owned()));
+    }
+    approved_students
+}
diff --git a/src/handlers.rs b/src/handlers.rs
index a64c012..96001ce 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -27,13 +27,13 @@ use warp::{http::StatusCode, reply};
 use crate::PRIVATE_KEY;
 
 // Valid blocks should have this many transactions
-const BLOCK_TRANSACTION_COUNT: u8 = 8;
+const BLOCK_TRANSACTION_COUNT: u8 = 4;
 // Inital registration bonus
-const REGISTER_BONUS: u16 = 40;
+const REGISTER_BONUS: u16 = 20;
 // Coinbase reward
-const BLOCK_REWARD: u16 = 3;
+const BLOCK_REWARD: u16 = 2;
 // Transaction amount limit
-const TX_UPPER_LIMIT: u16 = 10;
+const TX_UPPER_LIMIT: u16 = 4;
 const TX_LOWER_LIMIT: u16 = 1;
 // Transaction traffic reward
 const TX_TRAFFIC_REWARD: u16 = 1;
@@ -278,6 +278,7 @@ pub async fn authenticate_user(
     };
 
     // is the student in AuthRequest privileged?
+    // TODO: this is the only check for 'if metuid is approved' <15-04-22, yigit> //
     let privileged_student_id =
         if let Some(id) = MetuId::new(request.student_id.clone(), request.passwd.clone()) {
             id
diff --git a/src/student.rs b/src/student.rs
index 4b7acf1..711eeeb 100644
--- a/src/student.rs
+++ b/src/student.rs
@@ -26,6 +26,7 @@ pub struct User {
 }
 
 /// The values are hard coded in [`static@OUR_STUDENTS`] so `MetuId::new`() can accept/reject values based on that
+/// TODO update the statement above
 #[derive(Serialize, Deserialize, Debug, PartialEq, Clone)]
 pub struct MetuId {
     id: String,
@@ -46,10 +47,14 @@ impl MetuId {
             None
         }
     }
+
+    // TODO: replace the function above with this <15-04-22, yigit> //
+    pub fn _new(id: String, passwd: String) -> Self {
+        MetuId  { id, passwd }
+    }
 }
 
 // TODO: remove this, read from a yaml or something, then MetuId::new gets a self <11-04-22, yigit> //
-
 // Students who are authorized to have Gradecoin accounts
 lazy_static! {
     static ref OUR_STUDENTS: HashSet<(&'static str, &'static str)> = {
-- 
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