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Support charset in decode_data_url #137

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Merged
loewenheim merged 1 commit into from
Dec 6, 2025
Merged

Support charset in decode_data_url #137

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22 changes: 15 additions & 7 deletions src/decoder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,8 +12,6 @@ use crate::jsontypes::RawSourceMap;
use crate::types::{DecodedMap, RawToken, SourceMap, SourceMapIndex, SourceMapSection};
use crate::vlq::parse_vlq_segment_into;

const DATA_PREAMBLE: &str = "data:application/json;base64,";

#[derive(PartialEq, Eq)]
enum HeaderState {
Undecided,
Expand Down Expand Up @@ -339,12 +337,22 @@ pub fn decode_slice(slice: &[u8]) -> Result<DecodedMap> {
decode_common(rsm)
}

/// Loads a sourcemap from a data URL
/// Loads a sourcemap from a data URL.
///
/// The URL should match the regex
/// `data:application/json;(charset=utf-?8;)?base64,(?<base64sourcemap>.+)`.
pub fn decode_data_url(url: &str) -> Result<DecodedMap> {
if !url.starts_with(DATA_PREAMBLE) {
return Err(Error::InvalidDataUrl);
}
let data_b64 = &url[DATA_PREAMBLE.len()..];
let rest = url
.strip_prefix("data:application/json")
.ok_or(Error::InvalidDataUrl)?;
let rest = match rest.strip_prefix(";charset=") {
Some(rest) => rest
.strip_prefix("utf-8")
.or_else(|| rest.strip_prefix("utf8"))
.ok_or(Error::InvalidDataUrl)?,
None => rest,
};
let data_b64 = rest.strip_prefix(";base64,").ok_or(Error::InvalidDataUrl)?;
let data = data_encoding::BASE64
.decode(data_b64.as_bytes())
.map_err(|_| Error::InvalidDataUrl)?;
Expand Down
9 changes: 6 additions & 3 deletions tests/test_decoder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -116,11 +116,11 @@ fn test_basic_sourcemap_source_root_logic() {

#[test]
fn test_sourcemap_data_url() {
let url = "data:application/json;base64,\
let base64 = "\
eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbImNvb2xzdHVmZi5qcyJdLCJzb3VyY2VSb290I\
joieCIsIm5hbWVzIjpbIngiLCJhbGVydCJdLCJtYXBwaW5ncyI6IkFBQUEsR0FBSUEsR0\
FBSSxFQUNSLElBQUlBLEdBQUssRUFBRyxDQUNWQyxNQUFNIn0=";
match decode_data_url(url).unwrap() {
let test_url = |prefix: &str| match decode_data_url(&[prefix, base64].concat()).unwrap() {
DecodedMap::Regular(sm) => {
let mut iter = sm.tokens().filter(Token::has_name);
assert_eq!(
Expand All @@ -140,7 +140,10 @@ fn test_sourcemap_data_url() {
_ => {
panic!("did not get sourcemap");
}
}
};
test_url("data:application/json;base64,");
test_url("data:application/json;charset=utf-8;base64,");
test_url("data:application/json;charset=utf8;base64,");
}

#[test]
Expand Down