Implement formdata event

13 files changed, 188 insertions, 89 deletions

diff --git a/components/atoms/static_atoms.txt b/components/atoms/static_atoms.txt
index e14826f8430..db5680256f7 100644
--- a/components/atoms/static_atoms.txt
+++ b/components/atoms/static_atoms.txt
@@ -30,6 +30,7 @@ error
 fantasy
 fetch
 file
+formdata
 fullscreenchange
 fullscreenerror
 gattserverdisconnected
diff --git a/components/script/dom/formdata.rs b/components/script/dom/formdata.rs
index 2150e2aa7e5..7a084ca0162 100644
--- a/components/script/dom/formdata.rs
+++ b/components/script/dom/formdata.rs
@@ -6,7 +6,7 @@ use crate::dom::bindings::cell::DomRefCell;
 use crate::dom::bindings::codegen::Bindings::FormDataBinding::FormDataMethods;
 use crate::dom::bindings::codegen::Bindings::FormDataBinding::FormDataWrap;
 use crate::dom::bindings::codegen::UnionTypes::FileOrUSVString;
-use crate::dom::bindings::error::Fallible;
+use crate::dom::bindings::error::{Error, Fallible};
 use crate::dom::bindings::inheritance::Castable;
 use crate::dom::bindings::iterable::Iterable;
 use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
@@ -26,10 +26,9 @@ pub struct FormData {
 }
 
 impl FormData {
-    fn new_inherited(opt_form: Option<&HTMLFormElement>) -> FormData {
-        let data = match opt_form {
-            Some(form) => form
-                .get_form_dataset(None)
+    fn new_inherited(form_datums: Option<Vec<FormDatum>>) -> FormData {
+        let data = match form_datums {
+            Some(data) => data
                 .iter()
                 .map(|datum| (LocalName::from(datum.name.as_ref()), datum.clone()))
                 .collect::<Vec<(LocalName, FormDatum)>>(),
@@ -42,20 +41,27 @@ impl FormData {
         }
     }
 
-    pub fn new(form: Option<&HTMLFormElement>, global: &GlobalScope) -> DomRoot<FormData> {
+    pub fn new(form_datums: Option<Vec<FormDatum>>, global: &GlobalScope) -> DomRoot<FormData> {
         reflect_dom_object(
-            Box::new(FormData::new_inherited(form)),
+            Box::new(FormData::new_inherited(form_datums)),
             global,
             FormDataWrap,
         )
     }
 
+    // https://xhr.spec.whatwg.org/#dom-formdata
     pub fn Constructor(
         global: &GlobalScope,
         form: Option<&HTMLFormElement>,
     ) -> Fallible<DomRoot<FormData>> {
-        // TODO: Construct form data set for form if it is supplied
-        Ok(FormData::new(form, global))
+        if let Some(opt_form) = form {
+            return match opt_form.get_form_dataset(None) {
+                Some(form_datums) => Ok(FormData::new(Some(form_datums), global)),
+                None => Err(Error::InvalidState),
+            };
+        }
+
+        Ok(FormData::new(None, global))
     }
 }
 
diff --git a/components/script/dom/formdataevent.rs b/components/script/dom/formdataevent.rs
new file mode 100644
index 00000000000..f7ebb57bbfb
--- /dev/null
+++ b/components/script/dom/formdataevent.rs
@@ -0,0 +1,90 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::codegen::Bindings::EventBinding::EventMethods;
+use crate::dom::bindings::codegen::Bindings::FormDataEventBinding;
+use crate::dom::bindings::codegen::Bindings::FormDataEventBinding::FormDataEventMethods;
+use crate::dom::bindings::error::{Error, Fallible};
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject};
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::bindings::str::DOMString;
+use crate::dom::event::Event;
+use crate::dom::event::{EventBubbles, EventCancelable};
+use crate::dom::formdata::FormData;
+use crate::dom::globalscope::GlobalScope;
+use crate::dom::window::Window;
+use dom_struct::dom_struct;
+use servo_atoms::Atom;
+
+#[dom_struct]
+pub struct FormDataEvent {
+    event: Event,
+    form_data: Dom<FormData>,
+}
+
+impl FormDataEvent {
+    pub fn new(
+        global: &GlobalScope,
+        type_: Atom,
+        can_bubble: EventBubbles,
+        cancelable: EventCancelable,
+        form_data: &FormData,
+    ) -> DomRoot<FormDataEvent> {
+        let ev = reflect_dom_object(
+            Box::new(FormDataEvent {
+                event: Event::new_inherited(),
+                form_data: Dom::from_ref(form_data),
+            }),
+            global,
+            FormDataEventBinding::Wrap,
+        );
+
+        {
+            let event = ev.upcast::<Event>();
+            event.init_event(type_, bool::from(can_bubble), bool::from(cancelable));
+        }
+        ev
+    }
+
+    pub fn Constructor(
+        window: &Window,
+        type_: DOMString,
+        init: &FormDataEventBinding::FormDataEventInit,
+    ) -> Fallible<DomRoot<FormDataEvent>> {
+        let bubbles = EventBubbles::from(init.parent.bubbles);
+        let cancelable = EventCancelable::from(init.parent.cancelable);
+
+        let form_data = match init.formData {
+            Some(ref form_data) => form_data.clone(),
+            None => {
+                return Err(Error::Type(
+                    "required member formData is undefined".to_string(),
+                ));
+            },
+        };
+
+        let event = FormDataEvent::new(
+            &window.global(),
+            Atom::from(type_),
+            bubbles,
+            cancelable,
+            &*form_data,
+        );
+
+        Ok(event)
+    }
+}
+
+impl FormDataEventMethods for FormDataEvent {
+    // https://html.spec.whatwg.org/multipage/#dom-formdataevent-formdata
+    fn FormData(&self) -> DomRoot<FormData> {
+        DomRoot::from_ref(&*self.form_data)
+    }
+
+    // https://dom.spec.whatwg.org/#dom-event-istrusted
+    fn IsTrusted(&self) -> bool {
+        self.event.IsTrusted()
+    }
+}
diff --git a/components/script/dom/htmlformelement.rs b/components/script/dom/htmlformelement.rs
index 5469f0b7fc5..6a4a4b97fe5 100755
--- a/components/script/dom/htmlformelement.rs
+++ b/components/script/dom/htmlformelement.rs
@@ -20,8 +20,11 @@ use crate::dom::bindings::str::DOMString;
 use crate::dom::blob::Blob;
 use crate::dom::document::Document;
 use crate::dom::element::{AttributeMutation, Element};
+use crate::dom::event::{Event, EventBubbles, EventCancelable};
 use crate::dom::eventtarget::EventTarget;
 use crate::dom::file::File;
+use crate::dom::formdata::FormData;
+use crate::dom::formdataevent::FormDataEvent;
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::htmlbuttonelement::HTMLButtonElement;
 use crate::dom::htmlcollection::CollectionFilter;
@@ -68,6 +71,8 @@ pub struct GenerationId(u32);
 pub struct HTMLFormElement {
     htmlelement: HTMLElement,
     marked_for_reset: Cell<bool>,
+    /// https://html.spec.whatwg.org/multipage/#constructing-entry-list
+    constructing_entry_list: Cell<bool>,
     elements: DomOnceCell<HTMLFormControlsCollection>,
     generation_id: Cell<GenerationId>,
     controls: DomRefCell<Vec<Dom<Element>>>,
@@ -82,6 +87,7 @@ impl HTMLFormElement {
         HTMLFormElement {
             htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
             marked_for_reset: Cell::new(false),
+            constructing_entry_list: Cell::new(false),
             elements: Default::default(),
             generation_id: Cell::new(GenerationId(0)),
             controls: DomRefCell::new(Vec::new()),
@@ -311,11 +317,16 @@ impl HTMLFormElement {
 
     /// [Form submission](https://html.spec.whatwg.org/multipage/#concept-form-submit)
     pub fn submit(&self, submit_method_flag: SubmittedFrom, submitter: FormSubmitter) {
-        // Step 1
+        // TODO: Step 1. If form cannot navigate , then return.
+        // Step 2
+        if self.constructing_entry_list.get() {
+            return;
+        }
+        // Step 3
         let doc = document_from_node(self);
         let base = doc.base_url();
-        // TODO: Handle browsing contexts (Step 2, 3)
-        // Step 4
+        // TODO: Handle browsing contexts (Step 4, 5)
+        // Step 6
         if submit_method_flag == SubmittedFrom::NotFromForm && !submitter.no_validate(self) {
             if self.interactive_validation().is_err() {
                 // TODO: Implement event handlers on all form control elements
@@ -323,7 +334,7 @@ impl HTMLFormElement {
                 return;
             }
         }
-        // Step 5
+        // Step 7
         if submit_method_flag == SubmittedFrom::NotFromForm {
             let event = self
                 .upcast::<EventTarget>()
@@ -332,30 +343,36 @@ impl HTMLFormElement {
                 return;
             }
         }
-        // Step 6
-        let mut form_data = self.get_form_dataset(Some(submitter));
 
-        // Step 7
+        // Step 8
         let encoding = self.pick_encoding();
 
-        // Step 8
+        // Step 9
+        let mut form_data = match self.get_form_dataset(Some(submitter)) {
+            Some(form_data) => form_data,
+            None => return,
+        };
+
+        // TODO: Step 10. If form cannot navigate, then return.
+
+        // Step 11
         let mut action = submitter.action();
 
-        // Step 9
+        // Step 12
         if action.is_empty() {
             action = DOMString::from(base.as_str());
         }
-        // Step 10-11
+        // Step 13-14
         let action_components = match base.join(&action) {
             Ok(url) => url,
             Err(_) => return,
         };
-        // Step 12-15
+        // Step 15-17
         let scheme = action_components.scheme().to_owned();
         let enctype = submitter.enctype();
         let method = submitter.method();
 
-        // Step 16, 17
+        // Step 18-21
         let target_attribute_value = submitter.target();
         let source = doc.browsing_context().unwrap();
         let (maybe_chosen, _new) = source.choose_browsing_context(target_attribute_value, false);
@@ -375,7 +392,7 @@ impl HTMLFormElement {
             Some(target_document.url()),
         );
 
-        // Step 18
+        // Step 22
         match (&*scheme, method) {
             (_, FormMethod::FormDialog) => {
                 // TODO: Submit dialog
@@ -597,18 +614,18 @@ impl HTMLFormElement {
     }
 
     /// <https://html.spec.whatwg.org/multipage/#constructing-the-form-data-set>
-    /// Steps range from 1 to 3
+    /// Steps range from 3 to 5
     fn get_unclean_dataset(&self, submitter: Option<FormSubmitter>) -> Vec<FormDatum> {
         let controls = self.controls.borrow();
         let mut data_set = Vec::new();
         for child in controls.iter() {
-            // Step 3.1: The field element is disabled.
+            // Step 5.1: The field element is disabled.
             if child.disabled_state() {
                 continue;
             }
             let child = child.upcast::<Node>();
 
-            // Step 3.1: The field element has a datalist element ancestor.
+            // Step 5.1: The field element has a datalist element ancestor.
             if child
                 .ancestors()
                 .any(|a| DomRoot::downcast::<HTMLDataListElement>(a).is_some())
@@ -657,7 +674,7 @@ impl HTMLFormElement {
     }
 
     /// <https://html.spec.whatwg.org/multipage/#constructing-the-form-data-set>
-    pub fn get_form_dataset(&self, submitter: Option<FormSubmitter>) -> Vec<FormDatum> {
+    pub fn get_form_dataset(&self, submitter: Option<FormSubmitter>) -> Option<Vec<FormDatum>> {
         fn clean_crlf(s: &str) -> DOMString {
             // Step 4
             let mut buf = "".to_owned();
@@ -689,9 +706,16 @@ impl HTMLFormElement {
             DOMString::from(buf)
         }
 
-        // Step 1-3
+        // Step 1
+        if self.constructing_entry_list.get() {
+            return None;
+        }
+
+        // Step 2
+        self.constructing_entry_list.set(true);
+
+        // Step 3-6
         let mut ret = self.get_unclean_dataset(submitter);
-        // Step 4
         for datum in &mut ret {
             match &*datum.ty {
                 "file" | "textarea" => (), // TODO
@@ -704,8 +728,28 @@ impl HTMLFormElement {
                 },
             }
         }
-        // Step 5
-        ret
+
+        let window = window_from_node(self);
+
+        // Step 6
+        let form_data = FormData::new(Some(ret), &window.global());
+
+        // Step 7
+        let event = FormDataEvent::new(
+            &window.global(),
+            atom!("formdata"),
+            EventBubbles::Bubbles,
+            EventCancelable::NotCancelable,
+            &form_data,
+        );
+
+        event.upcast::<Event>().fire(self.upcast::<EventTarget>());
+
+        // Step 8
+        self.constructing_entry_list.set(false);
+
+        // Step 9
+        Some(form_data.datums())
     }
 
     pub fn reset(&self, _reset_method_flag: ResetFrom) {
diff --git a/components/script/dom/mod.rs b/components/script/dom/mod.rs
index d316000eee4..4d8e89d274f 100644
--- a/components/script/dom/mod.rs
+++ b/components/script/dom/mod.rs
@@ -303,6 +303,7 @@ pub mod filereader;
 pub mod filereadersync;
 pub mod focusevent;
 pub mod formdata;
+pub mod formdataevent;
 pub mod gainnode;
 pub mod gamepad;
 pub mod gamepadbutton;
diff --git a/components/script/dom/webidls/FormDataEvent.webidl b/components/script/dom/webidls/FormDataEvent.webidl
new file mode 100644
index 00000000000..d34f57b3a09
--- /dev/null
+++ b/components/script/dom/webidls/FormDataEvent.webidl
@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// https://html.spec.whatwg.org/multipage/#the-formdataevent-interface
+[Exposed=Window,
+ Constructor(DOMString type, optional FormDataEventInit eventInitDict)]
+interface FormDataEvent : Event {
+  readonly attribute FormData formData;
+};
+
+dictionary FormDataEventInit : EventInit {
+  /*required*/ FormData formData;
+};
diff --git a/tests/wpt/metadata/html/dom/interfaces.https.html.ini b/tests/wpt/metadata/html/dom/interfaces.https.html.ini
index a8713f72d2e..09b0653c697 100644
--- a/tests/wpt/metadata/html/dom/interfaces.https.html.ini
+++ b/tests/wpt/metadata/html/dom/interfaces.https.html.ini
@@ -10940,36 +10940,6 @@
   [ImageData interface: new ImageData(10, 10) must inherit property "data" with the proper type]
     expected: FAIL
 
-  [FormDataEvent interface object name]
-    expected: FAIL
-
-  [FormDataEvent interface: existence and properties of interface prototype object's "constructor" property]
-    expected: FAIL
-
-  [FormDataEvent interface: existence and properties of interface prototype object's @@unscopables property]
-    expected: FAIL
-
-  [FormDataEvent interface: attribute formData]
-    expected: FAIL
-
-  [Stringification of new FormDataEvent("formdata", { formData: new FormData() })]
-    expected: FAIL
-
-  [FormDataEvent interface: new FormDataEvent("formdata", { formData: new FormData() }) must inherit property "formData" with the proper type]
-    expected: FAIL
-
-  [FormDataEvent interface: existence and properties of interface object]
-    expected: FAIL
-
-  [FormDataEvent interface object length]
-    expected: FAIL
-
-  [FormDataEvent must be primary interface of new FormDataEvent("formdata", { formData: new FormData() })]
-    expected: FAIL
-
-  [FormDataEvent interface: existence and properties of interface prototype object]
-    expected: FAIL
-
   [OffscreenCanvasRenderingContext2D interface: operation measureText(DOMString)]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/FormDataEvent.window.js.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/FormDataEvent.window.js.ini
deleted file mode 100644
index 73c78e8da19..00000000000
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/FormDataEvent.window.js.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[FormDataEvent.window.html]
-  [Successful FormDataEvent constructor]
-    expected: FAIL
-
-  [Failing FormDataEvent constructor]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/constructing-form-data-set.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/constructing-form-data-set.html.ini
index 8916c9b84fd..956dc69251e 100644
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/constructing-form-data-set.html.ini
+++ b/tests/wpt/metadata/html/semantics/forms/form-submission-0/constructing-form-data-set.html.ini
@@ -10,13 +10,3 @@
 
   [Entries added to "formData" IDL attribute should be submitted.]
     expected: FAIL
-
-  ["formData" IDL attribute should have entries for form-associated elements in the first event handler, and the second handler can read entries set by the first handler.]
-    expected: FAIL
-
-  ["formdata" event bubbles, and is not cancelable.]
-    expected: FAIL
-
-  ["formdata" event bubbles in an orphan tree.]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini b/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
deleted file mode 100644
index be6f220e3a4..00000000000
--- a/tests/wpt/metadata/html/semantics/forms/form-submission-0/form-submission-algorithm.html.ini
+++ /dev/null
@@ -1,4 +0,0 @@
-[form-submission-algorithm.html]
-  [If constructing entry list flag of form is true, then return]
-    expected: FAIL
-
diff --git a/tests/wpt/metadata/xhr/formdata.htm.ini b/tests/wpt/metadata/xhr/formdata.htm.ini
deleted file mode 100644
index cf8cacd24af..00000000000
--- a/tests/wpt/metadata/xhr/formdata.htm.ini
+++ /dev/null
@@ -1,7 +0,0 @@
-[formdata.htm]
-  [|new FormData()| in formdata event handler should throw]
-    expected: FAIL
-
-  [Newly created FormData contains entries added to "formData" IDL attribute of FormDataEvent.]
-    expected: FAIL
-
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 86ac13bc878..16cb02a6068 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -27102,7 +27102,7 @@
    "testharness"
   ],
   "mozilla/interfaces.html": [
-   "95ab0109c82c8e90a3e53a3579b9337e2091e26c",
+   "55cafc9995da83d48230eed5b5c3863d8cf173c9",
    "testharness"
   ],
   "mozilla/interfaces.js": [
diff --git a/tests/wpt/mozilla/tests/mozilla/interfaces.html b/tests/wpt/mozilla/tests/mozilla/interfaces.html
index 95ab0109c82..55cafc9995d 100644
--- a/tests/wpt/mozilla/tests/mozilla/interfaces.html
+++ b/tests/wpt/mozilla/tests/mozilla/interfaces.html
@@ -77,6 +77,7 @@ test_interfaces([
   "FileReader",
   "FocusEvent",
   "FormData",
+  "FormDataEvent",
   "GainNode",
   "HashChangeEvent",
   "Headers",