Fix #1540, due to the URL-nature a get with an empty name is processe…

…d as a list call.

kube then fails to parse the result from the server.
Other HTTP METHODS, like "DELETE" are also affected and e.g. cause the deletion of ALL objects. See the issue for more info.

kube-core/src/request.rs

@@ -80,6 +80,7 @@ impl Request {
 
     /// Get a single instance
     pub fn get(&self, name: &str, gp: &GetParams) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         let urlstr = if let Some(rv) = &gp.resource_version {
             let target = format!("{}/{}?", self.url_path, name);
             form_urlencoded::Serializer::new(target)
@@ -106,6 +107,7 @@ impl Request {
 
     /// Delete an instance of a resource
     pub fn delete(&self, name: &str, dp: &DeleteParams) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         let target = format!("{}/{}?", self.url_path, name);
         let mut qp = form_urlencoded::Serializer::new(target);
         let urlstr = qp.finish();
@@ -149,6 +151,7 @@ impl Request {
         pp: &PatchParams,
         patch: &Patch<P>,
     ) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         pp.validate(patch)?;
         let target = format!("{}/{}?", self.url_path, name);
         let mut qp = form_urlencoded::Serializer::new(target);
@@ -171,6 +174,7 @@ impl Request {
         pp: &PostParams,
         data: Vec<u8>,
     ) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         let target = format!("{}/{}?", self.url_path, name);
         let mut qp = form_urlencoded::Serializer::new(target);
         pp.populate_qp(&mut qp);
@@ -188,6 +192,7 @@ impl Request {
         subresource_name: &str,
         name: &str,
     ) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         let target = format!("{}/{}/{}", self.url_path, name, subresource_name);
         let mut qp = form_urlencoded::Serializer::new(target);
         let urlstr = qp.finish();
@@ -203,6 +208,7 @@ impl Request {
         pp: &PostParams,
         data: Vec<u8>,
     ) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         let target = format!("{}/{}/{}?", self.url_path, name, subresource_name);
         let mut qp = form_urlencoded::Serializer::new(target);
         pp.populate_qp(&mut qp);
@@ -219,6 +225,7 @@ impl Request {
         pp: &PatchParams,
         patch: &Patch<P>,
     ) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         pp.validate(patch)?;
         let target = format!("{}/{}/{}?", self.url_path, name, subresource_name);
         let mut qp = form_urlencoded::Serializer::new(target);
@@ -240,6 +247,7 @@ impl Request {
         pp: &PostParams,
         data: Vec<u8>,
     ) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         let target = format!("{}/{}/{}?", self.url_path, name, subresource_name);
         let mut qp = form_urlencoded::Serializer::new(target);
         pp.populate_qp(&mut qp);
@@ -256,6 +264,7 @@ impl Request {
 impl Request {
     /// Get a single metadata instance for a named resource
     pub fn get_metadata(&self, name: &str, gp: &GetParams) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         let urlstr = if let Some(rv) = &gp.resource_version {
             let target = format!("{}/{}?", self.url_path, name);
             form_urlencoded::Serializer::new(target)
@@ -310,6 +319,7 @@ impl Request {
         pp: &PatchParams,
         patch: &Patch<P>,
     ) -> Result<http::Request<Vec<u8>>, Error> {
+        validate_name(name)?;
         pp.validate(patch)?;
         let target = format!("{}/{}?", self.url_path, name);
         let mut qp = form_urlencoded::Serializer::new(target);
@@ -324,14 +334,22 @@ impl Request {
     }
 }
 
+/// Names must not be empty as otherwise API server would interpret a `get` as `list`, or a `delete` as `delete_collection`
+fn validate_name(name: &str) -> Result<(), Error> {
+    if name.is_empty() {
+        return Err(Error::Validation("A non-empty name is required".into()));
+    }
+    Ok(())
+}
+
 /// Extensive tests for Request of k8s_openapi::Resource structs
 ///
 /// Cheap sanity check to ensure type maps work as expected
 #[cfg(test)]
 mod test {
     use crate::{
         params::{GetParams, PostParams, VersionMatch, WatchParams},
-        request::Request,
+        request::{Error, Request},
         resource::Resource,
     };
     use http::header;
@@ -490,6 +508,13 @@ mod test {
         );
     }
 
+    #[test]
+    fn get_empty_name() {
+        let url = appsv1::Deployment::url_path(&(), Some("ns"));
+        let req = Request::new(url).get("", &GetParams::any());
+        assert!(matches!(req, Err(Error::Validation(_))));
+    }
+
     #[test]
     fn list_path() {
         let url = appsv1::Deployment::url_path(&(), Some("ns"));