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use std::ops::Range;
use anyhow::Result;
use serde_derive::Serialize;
use wasmparser::{KnownCustom, Parser, Payload::*};
use crate::{
Authors, ComponentNames, Description, Homepage, Licenses, Metadata, ModuleNames, Producers,
Revision, Source,
};
/// Data representing either a Wasm Component or module
///
/// Each payload has additional [`Metadata`] associated with it,
/// but if it's a Component it may have also additional `Payloads` associated
/// with it.
#[derive(Debug, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum Payload {
/// A representation of a Wasm Component
Component {
/// The metadata associated with the Component
metadata: Metadata,
/// The metadata of nested Components or Modules
children: Vec<Payload>,
},
/// A representation of a Wasm Module
Module(Metadata),
}
impl Payload {
/// Parse metadata from a WebAssembly binary. Supports both core WebAssembly modules, and
/// WebAssembly components.
pub fn from_binary(input: &[u8]) -> Result<Self> {
let mut output = Vec::new();
for payload in Parser::new(0).parse_all(&input) {
match payload? {
Version { encoding, .. } => {
if output.is_empty() {
match encoding {
wasmparser::Encoding::Module => {
output.push(Self::empty_module(0..input.len()))
}
wasmparser::Encoding::Component => {
output.push(Self::empty_component(0..input.len()))
}
}
}
}
ModuleSection {
unchecked_range: range,
..
} => output.push(Self::empty_module(range)),
ComponentSection {
unchecked_range: range,
..
} => output.push(Self::empty_component(range)),
End { .. } => {
let finished = output.pop().expect("non-empty metadata stack");
if output.is_empty() {
return Ok(finished);
} else {
output.last_mut().unwrap().push_child(finished);
}
}
CustomSection(c) => match c.as_known() {
KnownCustom::Name(_) => {
let names = ModuleNames::from_bytes(c.data(), c.data_offset())?;
if let Some(name) = names.get_name() {
output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut()
.name = Some(name.clone());
}
}
KnownCustom::ComponentName(_) => {
let names = ComponentNames::from_bytes(c.data(), c.data_offset())?;
if let Some(name) = names.get_name() {
output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut()
.name = Some(name.clone());
}
}
KnownCustom::Producers(_) => {
let producers = Producers::from_bytes(c.data(), c.data_offset())?;
output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut()
.producers = Some(producers);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == "authors" => {
let a = Authors::parse_custom_section(&c)?;
let Metadata { authors, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*authors = Some(a);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == "description" => {
let a = Description::parse_custom_section(&c)?;
let Metadata { description, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*description = Some(a);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == "licenses" => {
let a = Licenses::parse_custom_section(&c)?;
let Metadata { licenses, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*licenses = Some(a);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == "source" => {
let a = Source::parse_custom_section(&c)?;
let Metadata { source, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*source = Some(a);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == "homepage" => {
let a = Homepage::parse_custom_section(&c)?;
let Metadata { homepage, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*homepage = Some(a);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == "revision" => {
let a = Revision::parse_custom_section(&c)?;
let Metadata { revision, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*revision = Some(a);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == "version" => {
let a = crate::Version::parse_custom_section(&c)?;
let Metadata { version, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*version = Some(a);
}
#[cfg(feature = "oci")]
KnownCustom::Unknown if c.name() == ".dep-v0" => {
let a = crate::Dependencies::parse_custom_section(&c)?;
let Metadata { dependencies, .. } = output
.last_mut()
.expect("non-empty metadata stack")
.metadata_mut();
*dependencies = Some(a);
}
_ => {}
},
_ => {}
}
}
Err(anyhow::anyhow!(
"malformed wasm binary, should have reached end"
))
}
/// Get a reference te the metadata
pub fn metadata(&self) -> &Metadata {
match self {
Payload::Component { metadata, .. } => metadata,
Payload::Module(metadata) => metadata,
}
}
/// Get a mutable reference te the metadata
pub fn metadata_mut(&mut self) -> &mut Metadata {
match self {
Payload::Component { metadata, .. } => metadata,
Payload::Module(metadata) => metadata,
}
}
fn empty_component(range: Range<usize>) -> Self {
let mut this = Self::Component {
metadata: Metadata::default(),
children: vec![],
};
this.metadata_mut().range = range;
this
}
fn empty_module(range: Range<usize>) -> Self {
let mut this = Self::Module(Metadata::default());
this.metadata_mut().range = range;
this
}
fn push_child(&mut self, child: Self) {
match self {
Self::Module { .. } => panic!("module shouldnt have children"),
Self::Component { children, .. } => children.push(child),
}
}
}