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use std::collections::HashMap;
use crate::error::Error;
use crate::Date;
use crate::DateInit;
use crate::Result;
use js_sys::Array;
use js_sys::Uint8Array;
use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast;
use wasm_bindgen_futures::JsFuture;
/// Representing the options any FormData value can be, a field or a file.
pub enum FormEntry {
Field(String),
File(File),
}
/// A [FormData](https://developer.mozilla.org/en-US/docs/Web/API/FormData) representation of the
/// request body, providing access to form encoded fields and files.
#[derive(Debug)]
pub struct FormData(web_sys::FormData);
impl FormData {
pub fn new() -> Self {
Self(web_sys::FormData::new().unwrap())
}
/// Returns the first value associated with a given key from within a `FormData` object.
pub fn get(&self, name: &str) -> Option<FormEntry> {
let val = self.0.get(name);
if val.is_undefined() {
return None;
}
if val.is_instance_of::<web_sys::File>() {
return Some(FormEntry::File(File(val.into())));
}
if let Some(field) = val.as_string() {
return Some(FormEntry::Field(field));
}
None
}
/// Returns the first Field value associated with a given key from within a `FormData` object.
pub fn get_field(&self, name: &str) -> Option<String> {
let val = self.0.get(name);
if val.is_undefined() {
return None;
}
if val.is_instance_of::<web_sys::File>() {
return None;
}
if let Some(field) = val.as_string() {
return Some(field);
}
None
}
/// Returns a vec of all the values associated with a given key from within a `FormData` object.
pub fn get_all(&self, name: &str) -> Option<Vec<FormEntry>> {
let val = self.0.get_all(name);
if val.is_undefined() {
return None;
}
if Array::is_array(&val) {
return Some(
val.to_vec()
.into_iter()
.map(|val| {
if val.is_instance_of::<web_sys::File>() {
return FormEntry::File(File(val.into()));
}
FormEntry::Field(val.as_string().unwrap_or_default())
})
.collect(),
);
}
None
}
/// Returns a boolean stating whether a `FormData` object contains a certain key.
pub fn has(&self, name: &str) -> bool {
self.0.has(name)
}
/// Appends a new value onto an existing key inside a `FormData` object, or adds the key if it
/// does not already exist.
pub fn append(&mut self, name: &str, value: &str) -> Result<()> {
self.0.append_with_str(name, value).map_err(Error::from)
}
/// Sets a new value for an existing key inside a `FormData` object, or adds the key/value if it
/// does not already exist.
pub fn set(&mut self, name: &str, value: &str) -> Result<()> {
self.0.set_with_str(name, value).map_err(Error::from)
}
/// Deletes a key/value pair from a `FormData` object.
pub fn delete(&mut self, name: &str) {
self.0.delete(name)
}
}
impl From<JsValue> for FormData {
fn from(val: JsValue) -> Self {
FormData(val.into())
}
}
impl From<HashMap<&dyn AsRef<&str>, &dyn AsRef<&str>>> for FormData {
fn from(m: HashMap<&dyn AsRef<&str>, &dyn AsRef<&str>>) -> Self {
let mut formdata = FormData::new();
for (k, v) in m {
// TODO: determine error case and consider how to handle
formdata.set(k.as_ref(), v.as_ref()).unwrap();
}
formdata
}
}
impl From<FormData> for wasm_bindgen::JsValue {
fn from(val: FormData) -> Self {
val.0.into()
}
}
/// A [File](https://developer.mozilla.org/en-US/docs/Web/API/File) representation used with
/// `FormData`.
pub struct File(web_sys::File);
impl File {
/// Construct a new named file from a buffer.
pub fn new(data: impl AsRef<[u8]>, name: &str) -> Self {
let data = data.as_ref();
let arr = Uint8Array::new_with_length(data.len() as u32);
arr.copy_from(data);
// The first parameter of File's constructor must be an ArrayBuffer or similar types
// https://developer.mozilla.org/en-US/docs/Web/API/File/File
let buffer = arr.buffer();
let file = web_sys::File::new_with_u8_array_sequence(&Array::of1(&buffer), name).unwrap();
Self(file)
}
/// Get the file name.
pub fn name(&self) -> String {
self.0.name()
}
/// Get the file size.
pub fn size(&self) -> usize {
self.0.size() as usize
}
/// Get the file type.
pub fn type_(&self) -> String {
self.0.type_()
}
/// Read the file from an internal buffer and get the resulting bytes.
pub async fn bytes(&self) -> Result<Vec<u8>> {
JsFuture::from(self.0.array_buffer())
.await
.map(|val| js_sys::Uint8Array::new(&val).to_vec())
.map_err(|e| {
Error::JsError(
e.as_string()
.unwrap_or_else(|| "failed to read array buffer from file".into()),
)
})
}
/// Get the last_modified metadata property of the file.
pub fn last_modified(&self) -> Date {
DateInit::Millis(self.0.last_modified() as u64).into()
}
}
impl From<web_sys::File> for File {
fn from(file: web_sys::File) -> Self {
Self(file)
}
}