[pitboss] phase 14: Track L.12 — Spring / Quarkus / Micronaut / Jakarta Servlet adapters

src/dynamic/framework/adapters/java_micronaut.rs

@@ -0,0 +1,171 @@
+//! Java Micronaut [`super::super::FrameworkAdapter`] (Phase 14 — Track L.12).
+//!
+//! Recognises Micronaut `@Controller("/path")` on a class plus a
+//! handler method annotated with `@Get("/sub")` / `@Post` / `@Put` /
+//! `@Delete` / `@Patch` / `@Head` / `@Options` (mixed-case, distinct
+//! from JAX-RS all-caps verbs).  Fires only when the source carries
+//! a Micronaut import stanza so a Spring `@Controller` + Spring
+//! `@GetMapping` file does not collide with this adapter.
+
+use crate::dynamic::framework::{FrameworkAdapter, FrameworkBinding, HttpMethod, RouteShape};
+use crate::evidence::EntryKind;
+use crate::summary::FuncSummary;
+use crate::symbol::Lang;
+use tree_sitter::Node;
+
+use super::java_routes::{
+    annotation_string_arg, bind_java_params, find_class_with_method, iter_annotations,
+    join_route_path, method_formal_types, source_imports_micronaut,
+};
+
+pub struct JavaMicronautAdapter;
+
+const ADAPTER_NAME: &str = "java-micronaut";
+
+fn verb_for(name: &str) -> Option<HttpMethod> {
+    match name {
+        "Get" => Some(HttpMethod::GET),
+        "Post" => Some(HttpMethod::POST),
+        "Put" => Some(HttpMethod::PUT),
+        "Delete" => Some(HttpMethod::DELETE),
+        "Patch" => Some(HttpMethod::PATCH),
+        "Head" => Some(HttpMethod::HEAD),
+        "Options" => Some(HttpMethod::OPTIONS),
+        _ => None,
+    }
+}
+
+fn class_path_prefix(class: Node<'_>, bytes: &[u8]) -> Option<String> {
+    let mut hit: Option<String> = None;
+    iter_annotations(class, bytes, |ann, name| {
+        if name == "Controller" {
+            hit = Some(annotation_string_arg(ann, bytes).unwrap_or_default());
+        }
+    });
+    hit
+}
+
+fn method_verb_and_path(
+    method: Node<'_>,
+    bytes: &[u8],
+) -> Option<(HttpMethod, String)> {
+    let mut hit: Option<(HttpMethod, String)> = None;
+    iter_annotations(method, bytes, |ann, name| {
+        if hit.is_some() {
+            return;
+        }
+        if let Some(v) = verb_for(name) {
+            let path = annotation_string_arg(ann, bytes).unwrap_or_default();
+            hit = Some((v, path));
+        }
+    });
+    hit
+}
+
+impl FrameworkAdapter for JavaMicronautAdapter {
+    fn name(&self) -> &'static str {
+        ADAPTER_NAME
+    }
+
+    fn lang(&self) -> Lang {
+        Lang::Java
+    }
+
+    fn detect(
+        &self,
+        summary: &FuncSummary,
+        ast: Node<'_>,
+        file_bytes: &[u8],
+    ) -> Option<FrameworkBinding> {
+        if !source_imports_micronaut(file_bytes) {
+            return None;
+        }
+        let (class, method) = find_class_with_method(ast, file_bytes, &summary.name)?;
+        let class_prefix = class_path_prefix(class, file_bytes)?;
+        let (http_method, method_path) = method_verb_and_path(method, file_bytes)?;
+        let path = join_route_path(&class_prefix, &method_path);
+        let formals = method_formal_types(method, file_bytes);
+        let request_params = bind_java_params(&formals, &path);
+        Some(FrameworkBinding {
+            adapter: ADAPTER_NAME.to_owned(),
+            kind: EntryKind::HttpRoute,
+            route: Some(RouteShape {
+                method: http_method,
+                path,
+            }),
+            request_params,
+            response_writer: None,
+            middleware: Vec::new(),
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::dynamic::framework::ParamSource;
+
+    fn parse(src: &[u8]) -> tree_sitter::Tree {
+        let mut parser = tree_sitter::Parser::new();
+        let lang = tree_sitter::Language::from(tree_sitter_java::LANGUAGE);
+        parser.set_language(&lang).unwrap();
+        parser.parse(src, None).unwrap()
+    }
+
+    fn summary(name: &str) -> FuncSummary {
+        FuncSummary {
+            name: name.into(),
+            lang: "java".into(),
+            ..Default::default()
+        }
+    }
+
+    #[test]
+    fn fires_on_controller_plus_get() {
+        let src: &[u8] = b"import io.micronaut.http.annotation.Controller;\nimport io.micronaut.http.annotation.Get;\n@Controller(\"/api\")\npublic class V {\n  @Get(\"/{id}\")\n  public String show(String id) { return id; }\n}\n";
+        let tree = parse(src);
+        let binding = JavaMicronautAdapter
+            .detect(&summary("show"), tree.root_node(), src)
+            .expect("binding");
+        assert_eq!(binding.adapter, "java-micronaut");
+        let route = binding.route.unwrap();
+        assert_eq!(route.method, HttpMethod::GET);
+        assert_eq!(route.path, "/api/{id}");
+        let id_binding = binding
+            .request_params
+            .iter()
+            .find(|p| p.name == "id")
+            .unwrap();
+        assert!(matches!(id_binding.source, ParamSource::PathSegment(_)));
+    }
+
+    #[test]
+    fn fires_on_post_with_empty_prefix() {
+        let src: &[u8] = b"import io.micronaut.http.annotation.Controller;\nimport io.micronaut.http.annotation.Post;\n@Controller\npublic class V {\n  @Post(\"/save\")\n  public String save(String body) { return body; }\n}\n";
+        let tree = parse(src);
+        let binding = JavaMicronautAdapter
+            .detect(&summary("save"), tree.root_node(), src)
+            .expect("binding");
+        let route = binding.route.unwrap();
+        assert_eq!(route.method, HttpMethod::POST);
+        assert_eq!(route.path, "/save");
+    }
+
+    #[test]
+    fn skips_non_micronaut_file() {
+        let src: &[u8] = b"@Controller\npublic class C {\n  @GetMapping(\"/x\")\n  public String x() { return \"\"; }\n}\n";
+        let tree = parse(src);
+        assert!(JavaMicronautAdapter
+            .detect(&summary("x"), tree.root_node(), src)
+            .is_none());
+    }
+
+    #[test]
+    fn skips_method_without_micronaut_verb() {
+        let src: &[u8] = b"import io.micronaut.http.annotation.Controller;\n@Controller(\"/api\")\npublic class V {\n  public String helper() { return \"\"; }\n}\n";
+        let tree = parse(src);
+        assert!(JavaMicronautAdapter
+            .detect(&summary("helper"), tree.root_node(), src)
+            .is_none());
+    }
+}