Move caching to src/cache/; Finalize API parsing fixes

Font and user cache code has been moved to special files, independant from src/config.rs

API parsing changes have been properly tested, and last.fm API JSON is now trace-logged for debugging convenience.

1 files changed, 58 insertions, 0 deletions

diff --git a/src/cache/font.rs b/src/cache/font.rs
new file mode 100644
index 0000000..c17247d
--- /dev/null
+++ b/src/cache/font.rs
@@ -0,0 +1,58 @@
+use std::sync::Arc;
+use std::time::Duration;
+use std::sync::LazyLock;
+
+use tokio::sync::RwLock;
+use reqwest::{StatusCode, Client};
+
+use super::{CacheFuture, CacheGetter, Cache, AsyncCache};
+use crate::CONFIG;
+
+#[derive(serde::Deserialize, Debug, Default)]
+#[serde(default)]
+#[serde(rename = "kebab-case")]
+pub struct FontQuery {
+  pub font: Option<Arc<str>>,
+  pub include_font: Option<Arc<str>>,
+  pub google_font: Option<Arc<str>>,
+//  pub small_font: Option<()>
+}
+
+pub type FontFuture = CacheFuture<Arc<str>>;
+pub type FontGetter = CacheGetter<Arc<str>>;
+pub type FontCache  = Cache<Arc<str>>;
+
+fn font_getter(fontname: &String) -> FontFuture {
+  let fontname = urlencoding::encode(fontname.as_ref()).to_string();
+  Box::pin(async move {
+    let Some(google_api_key) = CONFIG.google_api_key.clone()
+    else {
+      unreachable!();
+    };
+
+    let fontreq = HTTP.get(format!("https://www.googleapis.com/webfonts/v1/webfonts?key={}&family={fontname}", google_api_key))
+      .send().await
+      .map_err(|e| {log::error!("Failed to get info for font `{fontname}`: {e}"); (StatusCode::SERVICE_UNAVAILABLE, "Couldn't connect to Google Fonts!")})?;
+    if fontreq.status() == StatusCode::NOT_FOUND { return Err((StatusCode::NOT_FOUND, "Font does not exist!")); }
+    if fontreq.status() == StatusCode::FORBIDDEN {
+      log::error!("Invalid Google API key in config!");
+      return Err((StatusCode::SERVICE_UNAVAILABLE, "This instance is not configured to support Google Fonts properly, please use a different font."));
+    }
+
+    let cssreq = HTTP.get(format!("https://fonts.googleapis.com/css2?family={fontname}"))
+      .send().await
+      .map_err(|e| {log::error!("Failed to get CSS for font `{fontname}`: {e}"); (StatusCode::SERVICE_UNAVAILABLE, "Couldn't download font CSS!")})?;
+
+    Ok(cssreq.text().await.unwrap().into())
+  })
+}
+
+static HTTP: LazyLock<Client> = crate::http::lazy();
+
+static FONT_CACHE: LazyLock<FontCache> =  LazyLock::new(|| {
+  Arc::new(RwLock::new(AsyncCache::new(Duration::from_secs(86400), font_getter as FontGetter)))
+});
+
+pub async fn get_fontinfo(font: &String) -> Result<Arc<str>, (StatusCode, &'static str)> {
+  FONT_CACHE.write().await.get_owned(font).await
+}