From 96afce269b53730d29ec237f946e392b64d46d67 Mon Sep 17 00:00:00 2001
From: reederc42 <reederc42@gmail.com>
Date: Fri, 8 Mar 2024 15:32:34 -0800
Subject: [PATCH] Adds initial static server (#20)

---
 .github/workflows/rust.yaml |   24 +
 .gitignore                  |    1 +
 Cargo.lock                  | 1104 +++++++++++++++++++++++++++++++++++
 Cargo.toml                  |    8 +
 tools/Cargo.toml            |    8 +
 tools/src/main.rs           |    3 +
 wiki/Cargo.toml             |   11 +
 wiki/src/main.rs            |   20 +
 wiki/src/spa_server.rs      |  222 +++++++
 9 files changed, 1401 insertions(+)
 create mode 100644 .github/workflows/rust.yaml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 tools/Cargo.toml
 create mode 100644 tools/src/main.rs
 create mode 100644 wiki/Cargo.toml
 create mode 100644 wiki/src/main.rs
 create mode 100644 wiki/src/spa_server.rs

diff --git a/.github/workflows/rust.yaml b/.github/workflows/rust.yaml
new file mode 100644
index 0000000..a593c4b
--- /dev/null
+++ b/.github/workflows/rust.yaml
@@ -0,0 +1,24 @@
+name: Rust CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  RUSTFLAGS: "-Dwarnings"
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Lint
+      run: cargo clippy --all-targets --all-features
+
+    - name: Test
+      run: cargo test
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..96b6faf
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1104 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7a17e10
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[workspace]
+
+resolver = "2"
+
+members = [
+    "wiki",
+    "tools",
+]
diff --git a/tools/Cargo.toml b/tools/Cargo.toml
new file mode 100644
index 0000000..fcd57cd
--- /dev/null
+++ b/tools/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "tools"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/tools/src/main.rs b/tools/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/tools/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}
diff --git a/wiki/Cargo.toml b/wiki/Cargo.toml
new file mode 100644
index 0000000..ef4757f
--- /dev/null
+++ b/wiki/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "wiki"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
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+tokio = { version = "1", features = ["full"] }
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diff --git a/wiki/src/main.rs b/wiki/src/main.rs
new file mode 100644
index 0000000..05379c4
--- /dev/null
+++ b/wiki/src/main.rs
@@ -0,0 +1,20 @@
+use std::{path::Path, sync::Arc};
+
+use regex::Regex;
+
+mod spa_server;
+
+const DEFAULT_DIST_DIR: &str = "ui/dist";
+
+#[tokio::main]
+async fn main() {
+    let assets = spa_server::build_assets(Path::new(DEFAULT_DIST_DIR)).unwrap();
+
+    let filter = spa_server::filter(Arc::new(spa_server::FilterInput{
+        assets,
+        entrypoint: "index.html".to_string(),
+        path_validator: Regex::new(r"^$|wiki(:?-new)?").unwrap(),
+    }));
+
+    warp::serve(filter).bind(([127, 0, 0, 1], 8080)).await;
+}
diff --git a/wiki/src/spa_server.rs b/wiki/src/spa_server.rs
new file mode 100644
index 0000000..f8d4e88
--- /dev/null
+++ b/wiki/src/spa_server.rs
@@ -0,0 +1,222 @@
+// app_server provides a composable filter for a set of static assets with a
+// single entry point (such as index.html). The user provides a HashMap or phf
+// of static assets, and a validation function that tests paths and will return
+// the entry point if the validation passes.
+// TODO: fix up docs.
+
+use std::{collections::HashMap, ffi::OsStr, fs::{self, DirEntry}, io, path::Path, sync::Arc};
+
+use regex::Regex;
+use warp::{
+    filters::{
+        path::Tail,
+        BoxedFilter,
+    },
+    http::{
+        Response,
+        status::StatusCode,
+    },
+    reject,
+    reject::Rejection,
+    reply::Reply,
+    Filter,
+};
+
+#[derive(Debug)]
+pub struct Asset {
+    pub content_type: String,
+    pub content: Vec<u8>,
+}
+
+pub struct FilterInput {
+    pub assets: HashMap<String, Asset>,
+    pub entrypoint: String,
+    pub path_validator: Regex,
+}
+
+pub fn filter(input: Arc<FilterInput>) -> BoxedFilter<(impl Reply,)>
+{
+    warp::get()
+        .map(move || input.clone())
+        .and(warp::path::tail())
+        .and_then(handler)
+        .boxed()
+}
+
+async fn handler(input: Arc<FilterInput>, path: Tail) -> Result<Response<Vec<u8>>, Rejection>
+{
+    let assets = &input.assets;
+    let entrypoint = &input.entrypoint;
+    let path_validator = &input.path_validator;
+    let path = path.as_str();
+
+    match assets.get(path) {
+        Some(asset) => Ok(found(asset)),
+        None => {
+            println!("Testing path: {}", path);
+            if path_validator.is_match(path) {
+                Ok(found(assets.get(entrypoint.as_str()).unwrap()))
+            } else {
+                Err(reject::not_found())
+            }
+        }
+    }
+}
+
+fn found(asset: &Asset) -> Response<Vec<u8>> {
+    Response::builder()
+        .status(StatusCode::OK)
+        .header("Content-Type", asset.content_type.clone())
+        .body(asset.content.clone())
+        .unwrap()
+}
+
+pub fn build_assets(dir: &Path) -> io::Result<HashMap<String, Asset>> {
+    let mut assets = HashMap::new();
+    let content_types = build_content_types_map();
+
+    let mut cb = |entry: &DirEntry| -> io::Result<()> {
+        let content = match fs::read(entry.path()) {
+            Err(e) => return Err(e),
+            Ok(c) => c,
+        };
+
+        let path = entry.path();
+        let ext = path.extension().and_then(OsStr::to_str).unwrap();
+        let content_type = String::from(*content_types.get(ext).unwrap());
+
+        let asset = Asset{content_type, content};
+
+        let asset_path = String::from(
+            entry.path().to_str().unwrap()
+                .strip_prefix(dir.to_str().unwrap()).unwrap()
+                .trim_start_matches('/')
+        );
+
+        assets.insert(asset_path, asset);
+        Ok(())
+    };
+
+    match visit_files(dir, &mut cb) {
+        Err(e) => Err(e),
+        Ok(_) => Ok(assets),
+    }
+}
+
+fn visit_files(dir: &Path, cb: &mut dyn FnMut(&DirEntry) -> io::Result<()>) -> io::Result<()> {
+    if dir.is_dir() {
+        for entry in fs::read_dir(dir)? {
+            let entry = entry?;
+            let path = entry.path();
+            if path.is_dir() {
+                visit_files(&path, cb)?;
+            } else {
+                cb(&entry)?;
+            }
+        }
+    }
+    Ok(())
+}
+
+fn build_content_types_map() -> HashMap<&'static str, &'static str> {
+    let mut m = HashMap::new();
+
+    m.insert("ico", "image/x-icon");
+    m.insert("map", "application/json");
+    m.insert("json", "application/json");
+    m.insert("html", "text/html");
+    m.insert("js", "application/javascript");
+
+    m
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_found() {
+        let asset = Asset {
+            content_type: "text/html".to_string(),
+            content: Vec::from("hello, world"),
+        };
+
+        let res = found(&asset);
+        assert_eq!(asset.content, *res.body());
+        assert_eq!(
+            res.headers().get("Content-Type").unwrap().to_str().unwrap(),
+            asset.content_type,
+        );
+    }
+
+    #[tokio::test]
+    async fn test_handler_not_found() {
+        let mut assets = HashMap::new();
+        assets.insert("index.html".to_string(), Asset{
+            content_type: "text/html".to_string(),
+            content: Vec::from("hello, world!"),
+        });
+        let re = Regex::new("wiki").unwrap();
+
+        let input = Arc::new(FilterInput{
+            assets,
+            entrypoint: "index.html".to_string(),
+            path_validator: re,
+        });
+        let path = new_tail("/").await;
+
+        let result = handler(input, path).await;
+
+        assert!(result.unwrap_err().is_not_found());
+    }
+
+    #[tokio::test]
+    async fn test_handler_valid_path() {
+        let mut assets = HashMap::new();
+        assets.insert("index.html".to_string(), Asset{
+            content_type: "text/html".to_string(),
+            content: Vec::from("hello, world!"),
+        });
+        let re = Regex::new("wiki").unwrap();
+
+        let input = Arc::new(FilterInput{
+            assets,
+            entrypoint: "index.html".to_string(),
+            path_validator: re,
+        });
+        let path = new_tail("/wiki").await;
+
+        let result = handler(input, path).await;
+
+        assert_eq!(result.ok().unwrap().body(), &Vec::from("hello, world!"));
+    }
+
+    #[tokio::test]
+    async fn test_handler_valid_asset() {
+        let mut assets = HashMap::new();
+        assets.insert("index.html".to_string(), Asset{
+            content_type: "text/html".to_string(),
+            content: Vec::from("hello, world!"),
+        });
+        let re = Regex::new("/wiki").unwrap();
+
+        let input = Arc::new(FilterInput{
+            assets,
+            entrypoint: "index.html".to_string(),
+            path_validator: re,
+        });
+        let path = new_tail("/index.html").await;
+
+        let result = handler(input, path).await;
+
+        assert_eq!(result.ok().unwrap().body(), &Vec::from("hello, world!"));
+    }
+
+    async fn new_tail(path: &str) -> Tail {
+        warp::test::request()
+            .path(path)
+            .filter(&warp::path::tail())
+            .await
+            .unwrap()
+    }
+}