[pitboss] phase 21: Track M.3 — ScheduledJob + GraphQLResolver + WebSocket + Middleware + Migration

src/dynamic/framework/adapters/middleware_django.rs

@@ -0,0 +1,102 @@
+//! Phase 21 (Track M.3) — Django middleware adapter (Python).
+//!
+//! Fires when the surrounding source imports Django middleware base
+//! classes (`MiddlewareMixin`) or declares a callable middleware whose
+//! body defines `__call__(self, request)` / `process_request`.
+
+use crate::dynamic::framework::{FrameworkAdapter, FrameworkBinding};
+use crate::evidence::EntryKind;
+use crate::summary::FuncSummary;
+use crate::symbol::Lang;
+
+pub struct MiddlewareDjangoAdapter;
+
+const ADAPTER_NAME: &str = "middleware-django";
+
+fn callee_is_django_middleware(name: &str) -> bool {
+    let last = name.rsplit_once('.').map(|(_, s)| s).unwrap_or(name);
+    matches!(
+        last,
+        "process_request"
+            | "process_response"
+            | "process_view"
+            | "process_exception"
+            | "__call__"
+    )
+}
+
+fn source_imports_django_middleware(file_bytes: &[u8]) -> bool {
+    const NEEDLES: &[&[u8]] = &[
+        b"django.utils.deprecation",
+        b"MiddlewareMixin",
+        b"def __call__(self, request",
+        b"def process_request",
+        b"django.middleware",
+        b"MIDDLEWARE = [",
+    ];
+    NEEDLES
+        .iter()
+        .any(|n| file_bytes.windows(n.len()).any(|w| w == *n))
+}
+
+impl FrameworkAdapter for MiddlewareDjangoAdapter {
+    fn name(&self) -> &'static str {
+        ADAPTER_NAME
+    }
+
+    fn lang(&self) -> Lang {
+        Lang::Python
+    }
+
+    fn detect(
+        &self,
+        summary: &FuncSummary,
+        _ast: tree_sitter::Node<'_>,
+        file_bytes: &[u8],
+    ) -> Option<FrameworkBinding> {
+        let matches_call = super::any_callee_matches(summary, callee_is_django_middleware);
+        let matches_source = source_imports_django_middleware(file_bytes);
+        if matches_call || matches_source {
+            Some(FrameworkBinding {
+                adapter: ADAPTER_NAME.to_owned(),
+                kind: EntryKind::Middleware {
+                    name: summary.name.clone(),
+                },
+                route: None,
+                request_params: Vec::new(),
+                response_writer: None,
+                middleware: Vec::new(),
+            })
+        } else {
+            None
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn parse_python(src: &[u8]) -> tree_sitter::Tree {
+        let mut parser = tree_sitter::Parser::new();
+        let lang = tree_sitter::Language::from(tree_sitter_python::LANGUAGE);
+        parser.set_language(&lang).unwrap();
+        parser.parse(src, None).unwrap()
+    }
+
+    #[test]
+    fn fires_on_django_middleware() {
+        let src: &[u8] = b"from django.utils.deprecation import MiddlewareMixin\n\
+            class AuditMiddleware(MiddlewareMixin):\n    def process_request(self, request):\n        pass\n";
+        let tree = parse_python(src);
+        let summary = FuncSummary {
+            name: "process_request".into(),
+            ..Default::default()
+        };
+        let binding = MiddlewareDjangoAdapter
+            .detect(&summary, tree.root_node(), src)
+            .expect("django middleware binds");
+        assert_eq!(binding.adapter, "middleware-django");
+        assert!(matches!(binding.kind, EntryKind::Middleware { .. }));
+    }
+}