zhan7236 opened a new pull request, #6842:
URL: https://github.com/apache/opendal/pull/6842
# Which issue does this PR close?
Part of #4842.
# Rationale for this change
This PR adds user defined metadata support for the Azure Data Lake Storage
Gen2 service (`azdls`), which allows users to write and read custom metadata
along with their files.
# What changes are included in this PR?
- Add `X_MS_META_PREFIX` constant (`"x-ms-meta-"`) in `core.rs` for user
metadata HTTP header prefix
- Add user metadata headers support in `azdls_create` function
- Enable `write_with_user_metadata` capability in the service
- Parse user metadata from response headers in `azdls_stat_metadata`
function using `parse_prefixed_headers`
# Are there any user-facing changes?
Yes, users can now use `write_with().user_metadata()` to set custom metadata
when writing files to Azure Data Lake Storage Gen2 service, and retrieve them
via `stat()`.
Example:
```rust
let metadata = vec![("location".to_string(), "everywhere".to_string())];
op.write_with(&path, content)
.user_metadata(metadata)
.await?;
let meta = op.stat(&path).await?;
let user_meta = meta.user_metadata();
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