feat: make the web version fully working (#67)

Reviewed-on: #67

crates/state/src/credentials.rs

@@ -0,0 +1,105 @@
+use anyhow::Result;
+#[cfg(target_arch = "wasm32")]
+use common::web_store;
+use gpui::{App, AppContext as _, Task};
+
+use crate::USER_KEYRING;
+
+/// The storage key for the NIP-4e app keys
+const APP_KEYS_KEY: &str = "coop/nip4e/app-keys";
+
+/// Read the stored credential as `(username, secret)`
+#[allow(clippy::type_complexity)]
+pub(crate) fn read(cx: &App) -> Task<Result<Option<(String, Vec<u8>)>>> {
+    #[cfg(not(target_arch = "wasm32"))]
+    return cx.read_credentials(USER_KEYRING);
+
+    #[cfg(target_arch = "wasm32")]
+    {
+        let _ = cx;
+        Task::ready(
+            web_store::get(USER_KEYRING)
+                .map(|stored| stored.map(|content| (String::new(), content.into_bytes()))),
+        )
+    }
+}
+
+/// Write the stored credential
+pub(crate) fn write(cx: &App, username: &str, secret: &[u8]) -> Task<Result<()>> {
+    #[cfg(not(target_arch = "wasm32"))]
+    return cx.write_credentials(USER_KEYRING, username, secret);
+
+    #[cfg(target_arch = "wasm32")]
+    {
+        let _ = (cx, username);
+        let content = match std::str::from_utf8(secret) {
+            Ok(content) => content,
+            Err(e) => return Task::ready(Err(anyhow::anyhow!("credential is not UTF-8: {e}"))),
+        };
+
+        Task::ready(web_store::set(USER_KEYRING, content))
+    }
+}
+
+/// Delete the stored credential
+pub(crate) fn delete(cx: &App) -> Task<Result<()>> {
+    #[cfg(not(target_arch = "wasm32"))]
+    return cx.delete_credentials(USER_KEYRING);
+
+    #[cfg(target_arch = "wasm32")]
+    {
+        let _ = cx;
+        Task::ready(web_store::remove(USER_KEYRING))
+    }
+}
+
+/// Read named bytes from the platform keyring,
+/// falling back to browser storage on web where no keyring exists
+fn read_named(cx: &App, key: &str) -> Task<Result<Option<Vec<u8>>>> {
+    #[cfg(not(target_arch = "wasm32"))]
+    {
+        let key = key.to_owned();
+        let read = cx.read_credentials(&key);
+        cx.background_spawn(async move { Ok(read.await?.map(|(_, secret)| secret)) })
+    }
+
+    #[cfg(target_arch = "wasm32")]
+    {
+        let _ = cx;
+        let stored = web_store::get(key).map(|content| content.map(|s| s.into_bytes()));
+        Task::ready(stored)
+    }
+}
+
+/// Write named bytes to the platform keyring,
+/// falling back to browser storage on web where no keyring exists
+fn write_named(cx: &App, key: &str, secret: &[u8]) -> Task<Result<()>> {
+    #[cfg(not(target_arch = "wasm32"))]
+    {
+        let key = key.to_owned();
+        let secret = secret.to_vec();
+        let write = cx.write_credentials(&key, "", &secret);
+        cx.background_spawn(write)
+    }
+
+    #[cfg(target_arch = "wasm32")]
+    {
+        let _ = cx;
+        let content = match std::str::from_utf8(secret) {
+            Ok(content) => content,
+            Err(e) => return Task::ready(Err(anyhow::anyhow!("secret is not UTF-8: {e}"))),
+        };
+
+        Task::ready(web_store::set(key, content))
+    }
+}
+
+/// Load the NIP-4e app keys from storage, as raw secret bytes
+pub fn read_app_keys(cx: &App) -> Task<Result<Option<Vec<u8>>>> {
+    read_named(cx, APP_KEYS_KEY)
+}
+
+/// Persist the NIP-4e app keys, as raw secret bytes
+pub fn write_app_keys(cx: &App, secret: &[u8]) -> Task<Result<()>> {
+    write_named(cx, APP_KEYS_KEY, secret)
+}