From 4b044611e222efeed1c52af32301ccb07a85992d Mon Sep 17 00:00:00 2001
From: Eric Seppanen <eric@matician.com>
Date: Tue, 23 Jan 2024 13:40:06 -0800
Subject: [PATCH] add a way of getting the Crypto object

web_sys understands how to acquire Crypto from a Window or from a
WorkerGlobalScope, but neither of these work in a CF worker.

It turns out to be possible, but it's not obvious how to do it, so it's
convenient to have the worker crate provide this access.
---
 worker/Cargo.toml    | 1 +
 worker/src/crypto.rs | 6 ++++++
 worker/src/lib.rs    | 2 ++
 3 files changed, 9 insertions(+)
 create mode 100644 worker/src/crypto.rs

diff --git a/worker/Cargo.toml b/worker/Cargo.toml
index 8e4aee563..644f71a93 100644
--- a/worker/Cargo.toml
+++ b/worker/Cargo.toml
@@ -39,6 +39,7 @@ worker-sys = { path = "../worker-sys", version = "0.0.12" }
 [dependencies.web-sys]
 version = "0.3.63"
 features = [
+    "Crypto",
     "File",
     "WorkerGlobalScope",
     "ReadableStreamDefaultReader",
diff --git a/worker/src/crypto.rs b/worker/src/crypto.rs
new file mode 100644
index 000000000..d4a71c1ba
--- /dev/null
+++ b/worker/src/crypto.rs
@@ -0,0 +1,6 @@
+use wasm_bindgen::JsCast;
+
+pub fn crypto() -> web_sys::Crypto {
+    let global: web_sys::WorkerGlobalScope = js_sys::global().unchecked_into();
+    global.crypto().expect("failed to acquire Crypto")
+}
diff --git a/worker/src/lib.rs b/worker/src/lib.rs
index 9159a5c03..bf39946d8 100644
--- a/worker/src/lib.rs
+++ b/worker/src/lib.rs
@@ -25,6 +25,7 @@ pub use crate::abort::*;
 pub use crate::cache::{Cache, CacheDeletionOutcome, CacheKey};
 pub use crate::context::Context;
 pub use crate::cors::Cors;
+pub use crate::crypto::*;
 #[cfg(feature = "d1")]
 pub use crate::d1::*;
 pub use crate::date::{Date, DateInit};
@@ -55,6 +56,7 @@ mod cache;
 mod cf;
 mod context;
 mod cors;
+mod crypto;
 // Require pub module for macro export
 #[cfg(feature = "d1")]
 pub mod d1;