From 8551bf2e34d9543fa41a83fae785ed81d6a6c10f Mon Sep 17 00:00:00 2001
From: metamuffin <metamuffin@disroot.org>
Date: Sun, 6 Aug 2023 12:52:42 +0200
Subject: move shared server code to own crate

---
 base/src/lib.rs | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 base/src/lib.rs

(limited to 'base/src')

diff --git a/base/src/lib.rs b/base/src/lib.rs
new file mode 100644
index 0000000..62f93e7
--- /dev/null
+++ b/base/src/lib.rs
@@ -0,0 +1,42 @@
+/*
+    This file is part of jellything (https://codeberg.org/metamuffin/jellything)
+    which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
+    Copyright (C) 2023 metamuffin <metamuffin.org>
+*/
+#![feature(lazy_cell)]
+use base64::Engine;
+use jellycommon::config::GlobalConfig;
+use std::{fs::File, path::PathBuf, str::FromStr, sync::LazyLock};
+
+pub static CONF: LazyLock<GlobalConfig> = LazyLock::new(|| {
+    serde_json::from_reader(
+        File::open(
+            std::env::args()
+                .nth(1)
+                .expect("First argument must specify the config.json to use."),
+        )
+        .unwrap(),
+    )
+    .unwrap()
+});
+
+pub fn cache_file(seed: &[&str]) -> (PathBuf, Option<File>) {
+    use sha2::Digest;
+    let mut d = sha2::Sha512::new();
+    for s in seed {
+        d.update(s.as_bytes());
+        d.update(b"\0");
+    }
+    let d = d.finalize();
+    let fname = base64::engine::general_purpose::URL_SAFE.encode(d);
+    let fname = &fname[..22]; // about 128 bits
+    let fullpath = CONF.cache_path.join(fname);
+    let cachepath = PathBuf::from_str(fname).unwrap();
+
+    let f = if !fullpath.exists() {
+        Some(File::create(&fullpath).unwrap())
+    } else {
+        None
+    };
+    (cachepath, f)
+}
-- 
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