Initial Auth Impl + More Caching (#647)

* Port redis to staging

* redis cache on staging

* add back legacy auth callback

* Begin work on new auth flows

* Finish all auth flows

* Finish base session authentication

* run prep + fix clippy

* make compilation work

src/auth/session.rs

@@ -0,0 +1,80 @@
+use crate::auth::AuthenticationError;
+use crate::database::models::session_item::{Session, SessionBuilder};
+use crate::database::models::UserId;
+use crate::util::env::parse_var;
+use actix_web::HttpRequest;
+use rand::distributions::Alphanumeric;
+use rand::{Rng, SeedableRng};
+use rand_chacha::ChaCha20Rng;
+use woothee::parser::Parser;
+
+pub async fn issue_session(
+    req: HttpRequest,
+    user_id: UserId,
+    transaction: &mut sqlx::Transaction<'_, sqlx::Postgres>,
+    redis: &deadpool_redis::Pool,
+) -> Result<Session, AuthenticationError> {
+    let conn_info = req.connection_info().clone();
+    let ip_addr = if parse_var("CLOUDFLARE_INTEGRATION").unwrap_or(false) {
+        if let Some(header) = req.headers().get("CF-Connecting-IP") {
+            header.to_str().ok()
+        } else {
+            conn_info.peer_addr()
+        }
+    } else {
+        conn_info.peer_addr()
+    };
+
+    let country = req
+        .headers()
+        .get("cf-ipcountry")
+        .and_then(|x| x.to_str().ok());
+    let city = req.headers().get("cf-ipcity").and_then(|x| x.to_str().ok());
+
+    let user_agent = req
+        .headers()
+        .get("user-agent")
+        .and_then(|x| x.to_str().ok())
+        .ok_or_else(|| AuthenticationError::InvalidCredentials)?;
+
+    let parser = Parser::new();
+    let info = parser.parse(user_agent);
+    let os = if let Some(info) = info {
+        Some((info.os, info.name))
+    } else {
+        None
+    };
+
+    let session = ChaCha20Rng::from_entropy()
+        .sample_iter(&Alphanumeric)
+        .take(60)
+        .map(char::from)
+        .collect::<String>();
+
+    let session = format!("mra_{session}");
+
+    let id = SessionBuilder {
+        session,
+        user_id,
+        os: os.map(|x| x.0.to_string()),
+        platform: os.map(|x| x.1.to_string()),
+        city: city.map(|x| x.to_string()),
+        country: country.map(|x| x.to_string()),
+        ip: ip_addr
+            .ok_or_else(|| AuthenticationError::InvalidCredentials)?
+            .to_string(),
+        user_agent: user_agent.to_string(),
+    }
+    .insert(transaction)
+    .await?;
+
+    let session = Session::get_id(id, &mut *transaction, redis)
+        .await?
+        .ok_or_else(|| AuthenticationError::InvalidCredentials)?;
+
+    Ok(session)
+}
+
+// TODO: List user sessions route
+// TODO: Delete User Session Route / logout
+// TODO: Refresh session route