Merge pull request #11 from gyoder/httpstdlib

Added Basic HTTP stdlib. Closes #10

1 files changed, 228 insertions, 0 deletions

diff --git a/htmlua-parser/src/htmlua_stdlib.rs b/htmlua-parser/src/htmlua_stdlib.rs
new file mode 100644
index 0000000..d36620e
--- /dev/null
+++ b/htmlua-parser/src/htmlua_stdlib.rs
@@ -0,0 +1,228 @@
+use std::{
+    cell::{LazyCell, RefCell},
+    collections::HashMap,
+    fmt::Write,
+    rc::Rc,
+    str::FromStr,
+    time::Duration,
+};
+
+use mlua::{Error, Lua, Table, prelude::*};
+use reqwest::{
+    Method, Url,
+    blocking::{Client, Response},
+    header::HeaderMap,
+};
+use serde::{Deserialize, Serialize};
+
+
+pub fn create_htmlua_stdlib(l: &Lua, stdout: &Rc<RefCell<String>>) -> mlua::Result<Table> {
+    let t = l.create_table()?;
+
+    // This cannot be the best way to do this
+
+    let stdout_println = stdout.clone();
+    t.set(
+        "println",
+        l.create_function(move |_, text: String| {
+            let mut stdout_ref = stdout_println.borrow_mut();
+            writeln!(stdout_ref, "{text}").map_err(mlua::Error::external)
+        })?,
+    )?;
+
+    let stdout_print = stdout.clone();
+    t.set(
+        "print",
+        l.create_function(move |_, text: String| {
+            let mut stdout_ref = stdout_print.borrow_mut();
+            write!(stdout_ref, "{text}").map_err(mlua::Error::external)
+        })?,
+    )?;
+
+    t.set("http", create_http_lib(l)?)?;
+    Ok(t)
+}
+
+#[allow(clippy::too_many_lines)]
+fn create_http_lib(l: &Lua) -> mlua::Result<Table> {
+    let t = l.create_table()?;
+    let http_client: Rc<LazyCell<Client>> = Rc::new(LazyCell::new(|| {
+        Client::builder()
+            .timeout(std::time::Duration::from_secs(3))
+            .user_agent("htmlua/0.1.0")
+            .build()
+            .unwrap()
+    }));
+
+
+    let client = http_client.clone();
+    t.set(
+        "get",
+        l.create_function(move |_, url: String| {
+            let res = client.get(url).send().map_err(|e| Error::RuntimeError(e.to_string()))?;
+            let lua_res: LuaHttpResponse = TryFrom::try_from(res)?;
+            Ok(lua_res)
+        })?,
+    )?;
+
+    let client = http_client.clone();
+    t.set(
+        "post",
+        l.create_function(move |_, url: String| {
+            let res = client
+                .post(url)
+                .send()
+                .map_err(|e| Error::RuntimeError(e.to_string()))?;
+            let lua_res: LuaHttpResponse = TryFrom::try_from(res)?;
+            Ok(lua_res)
+        })?,
+    )?;
+
+    let client = http_client.clone();
+    t.set(
+        "get_with_data",
+        l.create_function(move |_, (url, data): (String, HashMap<String, String>)| {
+            let res = client
+                .get(url)
+                .query(&data)
+                .send()
+                .map_err(|e| Error::RuntimeError(e.to_string()))?;
+            let lua_res: LuaHttpResponse = TryFrom::try_from(res)?;
+            Ok(lua_res)
+        })?,
+    )?;
+
+    let client = http_client.clone();
+    t.set(
+        "post_with_data_form",
+        l.create_function(move |_, (url, data): (String, HashMap<String, String>)| {
+            let res = client
+                .post(url)
+                .form(&data)
+                .send()
+                .map_err(|e| Error::RuntimeError(e.to_string()))?;
+            let lua_res: LuaHttpResponse = TryFrom::try_from(res)?;
+            Ok(lua_res)
+        })?,
+    )?;
+
+    let client = http_client.clone();
+    t.set(
+        "post_with_data_json",
+        l.create_function(move |_, (url, data): (String, HashMap<String, String>)| {
+            let res = client
+                .post(url)
+                .json(&data)
+                .send()
+                .map_err(|e| Error::RuntimeError(e.to_string()))?;
+            let lua_res: LuaHttpResponse = TryFrom::try_from(res)?;
+            Ok(lua_res)
+        })?,
+    )?;
+
+    let client = http_client.clone();
+    t.set(
+        "request",
+        l.create_function(move |_, table: mlua::Table| {
+            let mut request = client.request(
+                Method::from_bytes(table.get::<String>("method")?.as_bytes())
+                    .map_err(|e| Error::RuntimeError(e.to_string()))?,
+                Url::from_str(table.get::<String>("url")?.as_str()).map_err(|e| Error::RuntimeError(e.to_string()))?,
+            );
+
+            if let Ok(header_tbl) = table.get::<mlua::Table>("headers") {
+                request = header_tbl
+                    .pairs::<String, String>()
+                    .filter_map(std::result::Result::ok)
+                    .fold(request, |req, (k, v)| req.header(k, v));
+            }
+
+            if let Ok(basic_auth) = table.get::<mlua::Table>("basic_auth") {
+                request = request
+                    .basic_auth(basic_auth.get::<String>("username")?, basic_auth.get::<String>("password").ok());
+            }
+
+            if let Ok(bearer_auth) = table.get::<mlua::Table>("bearer_auth") {
+                request = request.bearer_auth(bearer_auth.get::<String>("token")?);
+            }
+
+            if let Ok(body) = table.get::<String>("body") {
+                request = request.body(body);
+            }
+
+            if let Ok(json) = table.get::<String>("json") {
+                request = request.json(&json);
+            }
+
+            if let Ok(timeout) = table.get::<u64>("timeout") {
+                request = request.timeout(Duration::from_secs(timeout));
+            }
+
+
+            let res = request.send().map_err(|e| Error::RuntimeError(e.to_string()))?;
+            let lua_res: LuaHttpResponse = TryFrom::try_from(res)?;
+            Ok(lua_res)
+        })?,
+    )?;
+
+    t.set(
+        "decode_json",
+        l.create_function(move |l, text: String| {
+            let table: serde_json::Value =
+                serde_json::from_str(&text).map_err(|e| Error::RuntimeError(e.to_string()))?;
+            Ok(l.to_value(&table))
+        })?,
+    )?;
+
+    Ok(t)
+}
+
+
+#[derive(Serialize, Deserialize)]
+struct LuaHttpResponse {
+    headers: HashMap<String, String>,
+    body: String,
+    status: u16,
+}
+
+impl TryFrom<Response> for LuaHttpResponse {
+    fn try_from(value: Response) -> Result<Self, Self::Error> {
+        Ok(LuaHttpResponse {
+            headers: headermap_to_hashmap(value.headers()),
+            status: value.status().as_u16(),
+            body: value.text().map_err(|e| Error::RuntimeError(e.to_string()))?,
+        })
+    }
+
+    type Error = Error;
+}
+
+fn headermap_to_hashmap(headers: &HeaderMap) -> HashMap<String, String> {
+    let mut map = HashMap::new();
+
+    for (name, value) in headers {
+        if let Ok(value_str) = value.to_str() {
+            map.insert(name.as_str().to_string(), value_str.to_string());
+        }
+    }
+
+    map
+}
+
+
+impl IntoLua for LuaHttpResponse {
+    fn into_lua(self, lua: &Lua) -> LuaResult<LuaValue> {
+        let table = lua.create_table()?;
+
+        table.set("status", self.status)?;
+        table.set("body", self.body)?;
+
+        let headers_table = lua.create_table()?;
+        for (key, value) in self.headers {
+            headers_table.set(key, value)?;
+        }
+        table.set("headers", headers_table)?;
+
+        Ok(LuaValue::Table(table))
+    }
+}