zhan7236 opened a new pull request, #6844:
URL: https://github.com/apache/opendal/pull/6844
# Which issue does this PR close?
Part of #4842.
# Rationale for this change
This PR adds user defined metadata support for the Backblaze B2 service
(`b2`), which allows users to write and read custom metadata along with their
files.
# What changes are included in this PR?
- Add `X_BZ_INFO_PREFIX` constant (`"X-Bz-Info-"`) in `core.rs` for user
metadata HTTP header prefix
- Add `file_info` field to `File` struct to parse user metadata from B2 API
responses
- Add user metadata headers support in `upload_file` function with
URL-encoded values
- Update `parse_file_info` function to decode and return user metadata
- Enable `write_with_user_metadata` capability in the service
# Are there any user-facing changes?
Yes, users can now use `write_with().user_metadata()` to set custom metadata
when writing files to Backblaze B2 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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