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| 1 | +use std::borrow::Cow; |
| 2 | +use std::fmt::{self, Display}; |
| 3 | +use std::str::FromStr; |
| 4 | + |
| 5 | +use anyhow::{ensure, Error, Result}; |
| 6 | +use serde::Serialize; |
| 7 | +use url::Url; |
| 8 | +use wasm_encoder::{ComponentSection, CustomSection, Encode, Section}; |
| 9 | +use wasmparser::CustomSectionReader; |
| 10 | + |
| 11 | +/// URL to find more information on the binary |
| 12 | +#[derive(Debug, Clone, PartialEq)] |
| 13 | +pub struct Homepage(CustomSection<'static>); |
| 14 | + |
| 15 | +impl Homepage { |
| 16 | + /// Create a new instance of `Homepage`. |
| 17 | + pub fn new(s: &str) -> Result<Self> { |
| 18 | + Ok(Url::parse(s)?.into()) |
| 19 | + } |
| 20 | + |
| 21 | + /// Parse a `homepage` custom section from a wasm binary. |
| 22 | + pub(crate) fn parse_custom_section(reader: &CustomSectionReader<'_>) -> Result<Self> { |
| 23 | + ensure!( |
| 24 | + reader.name() == "homepage", |
| 25 | + "The `homepage` custom section should have a name of 'homepage'" |
| 26 | + ); |
| 27 | + let data = String::from_utf8(reader.data().to_owned())?; |
| 28 | + Self::new(&data) |
| 29 | + } |
| 30 | +} |
| 31 | + |
| 32 | +impl FromStr for Homepage { |
| 33 | + type Err = Error; |
| 34 | + |
| 35 | + fn from_str(s: &str) -> Result<Self, Self::Err> { |
| 36 | + Self::new(s) |
| 37 | + } |
| 38 | +} |
| 39 | + |
| 40 | +impl From<Url> for Homepage { |
| 41 | + fn from(expression: Url) -> Self { |
| 42 | + Self(CustomSection { |
| 43 | + name: "homepage".into(), |
| 44 | + data: Cow::Owned(expression.to_string().into_bytes()), |
| 45 | + }) |
| 46 | + } |
| 47 | +} |
| 48 | + |
| 49 | +impl Serialize for Homepage { |
| 50 | + fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error> |
| 51 | + where |
| 52 | + S: serde::Serializer, |
| 53 | + { |
| 54 | + serializer.serialize_str(&self.to_string()) |
| 55 | + } |
| 56 | +} |
| 57 | + |
| 58 | +impl Display for Homepage { |
| 59 | + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| 60 | + // NOTE: this will never panic since we always guarantee the data is |
| 61 | + // encoded as utf8, even if we internally store it as [u8]. |
| 62 | + let data = String::from_utf8(self.0.data.to_vec()).unwrap(); |
| 63 | + write!(f, "{data}") |
| 64 | + } |
| 65 | +} |
| 66 | + |
| 67 | +impl ComponentSection for Homepage { |
| 68 | + fn id(&self) -> u8 { |
| 69 | + ComponentSection::id(&self.0) |
| 70 | + } |
| 71 | +} |
| 72 | + |
| 73 | +impl Section for Homepage { |
| 74 | + fn id(&self) -> u8 { |
| 75 | + Section::id(&self.0) |
| 76 | + } |
| 77 | +} |
| 78 | + |
| 79 | +impl Encode for Homepage { |
| 80 | + fn encode(&self, sink: &mut Vec<u8>) { |
| 81 | + self.0.encode(sink); |
| 82 | + } |
| 83 | +} |
| 84 | + |
| 85 | +#[cfg(test)] |
| 86 | +mod test { |
| 87 | + use super::*; |
| 88 | + use wasm_encoder::Component; |
| 89 | + use wasmparser::Payload; |
| 90 | + |
| 91 | + #[test] |
| 92 | + fn roundtrip() { |
| 93 | + let mut component = Component::new(); |
| 94 | + component |
| 95 | + .section(&Homepage::new("https://github.com/bytecodealliance/wasm-tools").unwrap()); |
| 96 | + let component = component.finish(); |
| 97 | + |
| 98 | + let mut parsed = false; |
| 99 | + for section in wasmparser::Parser::new(0).parse_all(&component) { |
| 100 | + if let Payload::CustomSection(reader) = section.unwrap() { |
| 101 | + let description = Homepage::parse_custom_section(&reader).unwrap(); |
| 102 | + assert_eq!( |
| 103 | + description.to_string(), |
| 104 | + "https://github.com/bytecodealliance/wasm-tools" |
| 105 | + ); |
| 106 | + parsed = true; |
| 107 | + } |
| 108 | + } |
| 109 | + assert!(parsed); |
| 110 | + } |
| 111 | + |
| 112 | + #[test] |
| 113 | + fn serialize() { |
| 114 | + let description = Homepage::new("https://github.com/bytecodealliance/wasm-tools").unwrap(); |
| 115 | + let json = serde_json::to_string(&description).unwrap(); |
| 116 | + assert_eq!(r#""https://github.com/bytecodealliance/wasm-tools""#, json); |
| 117 | + } |
| 118 | +} |
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