aboutsummaryrefslogtreecommitdiff
path: root/src/api/s3/copy.rs
blob: a1a8c9a449a37e4bdf7250e4095fdb3961fda4d5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
use std::pin::Pin;
use std::sync::Arc;
use std::time::{Duration, SystemTime, UNIX_EPOCH};

use futures::{stream, stream::Stream, StreamExt, TryFutureExt};
use md5::{Digest as Md5Digest, Md5};

use bytes::Bytes;
use hyper::{Body, Request, Response};
use serde::Serialize;

use garage_rpc::netapp::bytes_buf::BytesBuf;
use garage_rpc::rpc_helper::OrderTag;
use garage_table::*;
use garage_util::data::*;
use garage_util::time::*;

use garage_model::garage::Garage;
use garage_model::key_table::Key;
use garage_model::s3::block_ref_table::*;
use garage_model::s3::object_table::*;
use garage_model::s3::version_table::*;

use crate::helpers::parse_bucket_key;
use crate::s3::error::*;
use crate::s3::put::{decode_upload_id, get_headers};
use crate::s3::xml::{self as s3_xml, xmlns_tag};

pub async fn handle_copy(
	garage: Arc<Garage>,
	api_key: &Key,
	req: &Request<Body>,
	dest_bucket_id: Uuid,
	dest_key: &str,
) -> Result<Response<Body>, Error> {
	let copy_precondition = CopyPreconditionHeaders::parse(req)?;

	let source_object = get_copy_source(&garage, api_key, req).await?;

	let (source_version, source_version_data, source_version_meta) =
		extract_source_info(&source_object)?;

	// Check precondition, e.g. x-amz-copy-source-if-match
	copy_precondition.check(source_version, &source_version_meta.etag)?;

	// Generate parameters for copied object
	let new_uuid = gen_uuid();
	let new_timestamp = now_msec();

	// Implement x-amz-metadata-directive: REPLACE
	let new_meta = match req.headers().get("x-amz-metadata-directive") {
		Some(v) if v == hyper::header::HeaderValue::from_static("REPLACE") => ObjectVersionMeta {
			headers: get_headers(req.headers())?,
			size: source_version_meta.size,
			etag: source_version_meta.etag.clone(),
		},
		_ => source_version_meta.clone(),
	};

	let etag = new_meta.etag.to_string();

	// Save object copy
	match source_version_data {
		ObjectVersionData::DeleteMarker => unreachable!(),
		ObjectVersionData::Inline(_meta, bytes) => {
			let dest_object_version = ObjectVersion {
				uuid: new_uuid,
				timestamp: new_timestamp,
				state: ObjectVersionState::Complete(ObjectVersionData::Inline(
					new_meta,
					bytes.clone(),
				)),
			};
			let dest_object = Object::new(
				dest_bucket_id,
				dest_key.to_string(),
				vec![dest_object_version],
			);
			garage.object_table.insert(&dest_object).await?;
		}
		ObjectVersionData::FirstBlock(_meta, first_block_hash) => {
			// Get block list from source version
			let source_version = garage
				.version_table
				.get(&source_version.uuid, &EmptyKey)
				.await?;
			let source_version = source_version.ok_or(Error::NoSuchKey)?;

			// Write an "uploading" marker in Object table
			// This holds a reference to the object in the Version table
			// so that it won't be deleted, e.g. by repair_versions.
			let tmp_dest_object_version = ObjectVersion {
				uuid: new_uuid,
				timestamp: new_timestamp,
				state: ObjectVersionState::Uploading(new_meta.headers.clone()),
			};
			let tmp_dest_object = Object::new(
				dest_bucket_id,
				dest_key.to_string(),
				vec![tmp_dest_object_version],
			);
			garage.object_table.insert(&tmp_dest_object).await?;

			// Write version in the version table. Even with empty block list,
			// this means that the BlockRef entries linked to this version cannot be
			// marked as deleted (they are marked as deleted only if the Version
			// doesn't exist or is marked as deleted).
			let mut dest_version =
				Version::new(new_uuid, dest_bucket_id, dest_key.to_string(), false);
			garage.version_table.insert(&dest_version).await?;

			// Fill in block list for version and insert block refs
			for (bk, bv) in source_version.blocks.items().iter() {
				dest_version.blocks.put(*bk, *bv);
			}
			let dest_block_refs = dest_version
				.blocks
				.items()
				.iter()
				.map(|b| BlockRef {
					block: b.1.hash,
					version: new_uuid,
					deleted: false.into(),
				})
				.collect::<Vec<_>>();
			futures::try_join!(
				garage.version_table.insert(&dest_version),
				garage.block_ref_table.insert_many(&dest_block_refs[..]),
			)?;

			// Insert final object
			// We do this last because otherwise there is a race condition in the case where
			// the copy call has the same source and destination (this happens, rclone does
			// it to update the modification timestamp for instance). If we did this concurrently
			// with the stuff before, the block's reference counts could be decremented before
			// they are incremented again for the new version, leading to data being deleted.
			let dest_object_version = ObjectVersion {
				uuid: new_uuid,
				timestamp: new_timestamp,
				state: ObjectVersionState::Complete(ObjectVersionData::FirstBlock(
					new_meta,
					*first_block_hash,
				)),
			};
			let dest_object = Object::new(
				dest_bucket_id,
				dest_key.to_string(),
				vec![dest_object_version],
			);
			garage.object_table.insert(&dest_object).await?;
		}
	}

	let last_modified = msec_to_rfc3339(new_timestamp);
	let result = CopyObjectResult {
		last_modified: s3_xml::Value(last_modified),
		etag: s3_xml::Value(format!("\"{}\"", etag)),
	};
	let xml = s3_xml::to_xml_with_header(&result)?;

	Ok(Response::builder()
		.header("Content-Type", "application/xml")
		.header("x-amz-version-id", hex::encode(new_uuid))
		.header(
			"x-amz-copy-source-version-id",
			hex::encode(source_version.uuid),
		)
		.body(Body::from(xml))?)
}

pub async fn handle_upload_part_copy(
	garage: Arc<Garage>,
	api_key: &Key,
	req: &Request<Body>,
	dest_bucket_id: Uuid,
	dest_key: &str,
	part_number: u64,
	upload_id: &str,
) -> Result<Response<Body>, Error> {
	let copy_precondition = CopyPreconditionHeaders::parse(req)?;

	let dest_version_uuid = decode_upload_id(upload_id)?;

	let dest_key = dest_key.to_string();
	let (source_object, dest_object) = futures::try_join!(
		get_copy_source(&garage, api_key, req),
		garage
			.object_table
			.get(&dest_bucket_id, &dest_key)
			.map_err(Error::from),
	)?;
	let dest_object = dest_object.ok_or(Error::NoSuchKey)?;

	let (source_object_version, source_version_data, source_version_meta) =
		extract_source_info(&source_object)?;

	// Check precondition on source, e.g. x-amz-copy-source-if-match
	copy_precondition.check(source_object_version, &source_version_meta.etag)?;

	// Check source range is valid
	let source_range = match req.headers().get("x-amz-copy-source-range") {
		Some(range) => {
			let range_str = range.to_str()?;
			let mut ranges = http_range::HttpRange::parse(range_str, source_version_meta.size)
				.map_err(|e| (e, source_version_meta.size))?;
			if ranges.len() != 1 {
				return Err(Error::bad_request(
					"Invalid x-amz-copy-source-range header: exactly 1 range must be given",
				));
			} else {
				ranges.pop().unwrap()
			}
		}
		None => http_range::HttpRange {
			start: 0,
			length: source_version_meta.size,
		},
	};

	// Check destination version is indeed in uploading state
	if !dest_object
		.versions()
		.iter()
		.any(|v| v.uuid == dest_version_uuid && v.is_uploading())
	{
		return Err(Error::NoSuchUpload);
	}

	// Check source version is not inlined
	match source_version_data {
		ObjectVersionData::DeleteMarker => unreachable!(),
		ObjectVersionData::Inline(_meta, _bytes) => {
			// This is only for small files, we don't bother handling this.
			// (in AWS UploadPartCopy works for parts at least 5MB which
			// is never the case of an inline object)
			return Err(Error::bad_request(
				"Source object is too small (minimum part size is 5Mb)",
			));
		}
		ObjectVersionData::FirstBlock(_meta, _first_block_hash) => (),
	};

	// Fetch source versin with its block list,
	// and destination version to check part hasn't yet been uploaded
	let (source_version, dest_version) = futures::try_join!(
		garage
			.version_table
			.get(&source_object_version.uuid, &EmptyKey),
		garage.version_table.get(&dest_version_uuid, &EmptyKey),
	)?;
	let source_version = source_version.ok_or(Error::NoSuchKey)?;

	// Check this part number hasn't yet been uploaded
	if let Some(dv) = dest_version {
		if dv.has_part_number(part_number) {
			return Err(Error::bad_request(format!(
				"Part number {} has already been uploaded",
				part_number
			)));
		}
	}

	// We want to reuse blocks from the source version as much as possible.
	// However, we still need to get the data from these blocks
	// because we need to know it to calculate the MD5sum of the part
	// which is used as its ETag.

	// First, calculate what blocks we want to keep,
	// and the subrange of the block to take, if the bounds of the
	// requested range are in the middle.
	let (range_begin, range_end) = (source_range.start, source_range.start + source_range.length);

	let mut blocks_to_copy = vec![];
	let mut current_offset = 0;
	for (_bk, block) in source_version.blocks.items().iter() {
		let (block_begin, block_end) = (current_offset, current_offset + block.size);

		if block_begin < range_end && block_end > range_begin {
			let subrange_begin = if block_begin < range_begin {
				Some(range_begin - block_begin)
			} else {
				None
			};
			let subrange_end = if block_end > range_end {
				Some(range_end - block_begin)
			} else {
				None
			};
			let range_to_copy = match (subrange_begin, subrange_end) {
				(Some(b), Some(e)) => Some(b as usize..e as usize),
				(None, Some(e)) => Some(0..e as usize),
				(Some(b), None) => Some(b as usize..block.size as usize),
				(None, None) => None,
			};

			blocks_to_copy.push((block.hash, range_to_copy));
		}

		current_offset = block_end;
	}

	// Now, actually copy the blocks
	let mut md5hasher = Md5::new();

	// First, create a stream that is able to read the source blocks
	// and extract the subrange if necessary.
	// The second returned value is an Option<Hash>, that is Some
	// if and only if the block returned is a block that already existed
	// in the Garage data store (thus we don't need to save it again).
	let garage2 = garage.clone();
	let order_stream = OrderTag::stream();
	let source_blocks = stream::iter(blocks_to_copy)
		.enumerate()
		.flat_map(|(i, (block_hash, range_to_copy))| {
			let garage3 = garage2.clone();
			stream::once(async move {
				let data = garage3
					.block_manager
					.rpc_get_block(&block_hash, Some(order_stream.order(i as u64)))
					.await?;
				match range_to_copy {
					Some(r) => Ok((data.slice(r), None)),
					None => Ok((data, Some(block_hash))),
				}
			})
		})
		.peekable();

	// The defragmenter is a custom stream (defined below) that concatenates
	// consecutive block parts when they are too small.
	// It returns a series of (Vec<u8>, Option<Hash>).
	// When it is done, it returns an empty vec.
	// Same as the previous iterator, the Option is Some(_) if and only if
	// it's an existing block of the Garage data store.
	let mut defragmenter = Defragmenter::new(garage.config.block_size, Box::pin(source_blocks));

	let mut current_offset = 0;
	let mut next_block = defragmenter.next().await?;

	loop {
		let (data, existing_block_hash) = next_block;
		if data.is_empty() {
			break;
		}

		md5hasher.update(&data[..]);

		let must_upload = existing_block_hash.is_none();
		let final_hash = existing_block_hash.unwrap_or_else(|| blake2sum(&data[..]));

		let mut version = Version::new(dest_version_uuid, dest_bucket_id, dest_key.clone(), false);
		version.blocks.put(
			VersionBlockKey {
				part_number,
				offset: current_offset,
			},
			VersionBlock {
				hash: final_hash,
				size: data.len() as u64,
			},
		);
		current_offset += data.len() as u64;

		let block_ref = BlockRef {
			block: final_hash,
			version: dest_version_uuid,
			deleted: false.into(),
		};

		let garage2 = garage.clone();
		let res = futures::try_join!(
			// Thing 1: if the block is not exactly a block that existed before,
			// we need to insert that data as a new block.
			async move {
				if must_upload {
					garage2.block_manager.rpc_put_block(final_hash, data).await
				} else {
					Ok(())
				}
			},
			// Thing 2: we need to insert the block in the version
			garage.version_table.insert(&version),
			// Thing 3: we need to add a block reference
			garage.block_ref_table.insert(&block_ref),
			// Thing 4: we need to prefetch the next block
			defragmenter.next(),
		)?;
		next_block = res.3;
	}

	let data_md5sum = md5hasher.finalize();
	let etag = hex::encode(data_md5sum);

	// Put the part's ETag in the Versiontable
	let mut version = Version::new(dest_version_uuid, dest_bucket_id, dest_key.clone(), false);
	version.parts_etags.put(part_number, etag.clone());
	garage.version_table.insert(&version).await?;

	// LGTM
	let resp_xml = s3_xml::to_xml_with_header(&CopyPartResult {
		xmlns: (),
		etag: s3_xml::Value(format!("\"{}\"", etag)),
		last_modified: s3_xml::Value(msec_to_rfc3339(source_object_version.timestamp)),
	})?;

	Ok(Response::builder()
		.header("Content-Type", "application/xml")
		.header(
			"x-amz-copy-source-version-id",
			hex::encode(source_object_version.uuid),
		)
		.body(Body::from(resp_xml))?)
}

async fn get_copy_source(
	garage: &Garage,
	api_key: &Key,
	req: &Request<Body>,
) -> Result<Object, Error> {
	let copy_source = req.headers().get("x-amz-copy-source").unwrap().to_str()?;
	let copy_source = percent_encoding::percent_decode_str(copy_source).decode_utf8()?;

	let (source_bucket, source_key) = parse_bucket_key(&copy_source, None)?;
	let source_bucket_id = garage
		.bucket_helper()
		.resolve_bucket(&source_bucket.to_string(), api_key)
		.await?;

	if !api_key.allow_read(&source_bucket_id) {
		return Err(Error::forbidden(format!(
			"Reading from bucket {} not allowed for this key",
			source_bucket
		)));
	}

	let source_key = source_key.ok_or_bad_request("No source key specified")?;

	let source_object = garage
		.object_table
		.get(&source_bucket_id, &source_key.to_string())
		.await?
		.ok_or(Error::NoSuchKey)?;

	Ok(source_object)
}

fn extract_source_info(
	source_object: &Object,
) -> Result<(&ObjectVersion, &ObjectVersionData, &ObjectVersionMeta), Error> {
	let source_version = source_object
		.versions()
		.iter()
		.rev()
		.find(|v| v.is_complete())
		.ok_or(Error::NoSuchKey)?;

	let source_version_data = match &source_version.state {
		ObjectVersionState::Complete(x) => x,
		_ => unreachable!(),
	};

	let source_version_meta = match source_version_data {
		ObjectVersionData::DeleteMarker => {
			return Err(Error::NoSuchKey);
		}
		ObjectVersionData::Inline(meta, _bytes) => meta,
		ObjectVersionData::FirstBlock(meta, _fbh) => meta,
	};

	Ok((source_version, source_version_data, source_version_meta))
}

struct CopyPreconditionHeaders {
	copy_source_if_match: Option<Vec<String>>,
	copy_source_if_modified_since: Option<SystemTime>,
	copy_source_if_none_match: Option<Vec<String>>,
	copy_source_if_unmodified_since: Option<SystemTime>,
}

impl CopyPreconditionHeaders {
	fn parse(req: &Request<Body>) -> Result<Self, Error> {
		Ok(Self {
			copy_source_if_match: req
				.headers()
				.get("x-amz-copy-source-if-match")
				.map(|x| x.to_str())
				.transpose()?
				.map(|x| {
					x.split(',')
						.map(|m| m.trim().trim_matches('"').to_string())
						.collect::<Vec<_>>()
				}),
			copy_source_if_modified_since: req
				.headers()
				.get("x-amz-copy-source-if-modified-since")
				.map(|x| x.to_str())
				.transpose()?
				.map(httpdate::parse_http_date)
				.transpose()
				.ok_or_bad_request("Invalid date in x-amz-copy-source-if-modified-since")?,
			copy_source_if_none_match: req
				.headers()
				.get("x-amz-copy-source-if-none-match")
				.map(|x| x.to_str())
				.transpose()?
				.map(|x| {
					x.split(',')
						.map(|m| m.trim().trim_matches('"').to_string())
						.collect::<Vec<_>>()
				}),
			copy_source_if_unmodified_since: req
				.headers()
				.get("x-amz-copy-source-if-unmodified-since")
				.map(|x| x.to_str())
				.transpose()?
				.map(httpdate::parse_http_date)
				.transpose()
				.ok_or_bad_request("Invalid date in x-amz-copy-source-if-unmodified-since")?,
		})
	}

	fn check(&self, v: &ObjectVersion, etag: &str) -> Result<(), Error> {
		let v_date = UNIX_EPOCH + Duration::from_millis(v.timestamp);

		let ok = match (
			&self.copy_source_if_match,
			&self.copy_source_if_unmodified_since,
			&self.copy_source_if_none_match,
			&self.copy_source_if_modified_since,
		) {
			// TODO I'm not sure all of the conditions are evaluated correctly here

			// If we have both if-match and if-unmodified-since,
			// basically we don't care about if-unmodified-since,
			// because in the spec it says that if if-match evaluates to
			// true but if-unmodified-since evaluates to false,
			// the copy is still done.
			(Some(im), _, None, None) => im.iter().any(|x| x == etag || x == "*"),
			(None, Some(ius), None, None) => v_date <= *ius,

			// If we have both if-none-match and if-modified-since,
			// then both of the two conditions must evaluate to true
			(None, None, Some(inm), Some(ims)) => {
				!inm.iter().any(|x| x == etag || x == "*") && v_date > *ims
			}
			(None, None, Some(inm), None) => !inm.iter().any(|x| x == etag || x == "*"),
			(None, None, None, Some(ims)) => v_date > *ims,
			(None, None, None, None) => true,
			_ => {
				return Err(Error::bad_request(
					"Invalid combination of x-amz-copy-source-if-xxxxx headers",
				))
			}
		};

		if ok {
			Ok(())
		} else {
			Err(Error::PreconditionFailed)
		}
	}
}

type BlockStreamItemOk = (Bytes, Option<Hash>);
type BlockStreamItem = Result<BlockStreamItemOk, garage_util::error::Error>;

struct Defragmenter<S: Stream<Item = BlockStreamItem>> {
	block_size: usize,
	block_stream: Pin<Box<stream::Peekable<S>>>,
	buffer: BytesBuf,
	hash: Option<Hash>,
}

impl<S: Stream<Item = BlockStreamItem>> Defragmenter<S> {
	fn new(block_size: usize, block_stream: Pin<Box<stream::Peekable<S>>>) -> Self {
		Self {
			block_size,
			block_stream,
			buffer: BytesBuf::new(),
			hash: None,
		}
	}

	async fn next(&mut self) -> BlockStreamItem {
		// Fill buffer while we can
		while let Some(res) = self.block_stream.as_mut().peek().await {
			let (peeked_next_block, _) = match res {
				Ok(t) => t,
				Err(_) => {
					self.block_stream.next().await.unwrap()?;
					unreachable!()
				}
			};

			if self.buffer.is_empty() {
				let (next_block, next_block_hash) = self.block_stream.next().await.unwrap()?;
				self.buffer.extend(next_block);
				self.hash = next_block_hash;
			} else if self.buffer.len() + peeked_next_block.len() > self.block_size {
				break;
			} else {
				let (next_block, _) = self.block_stream.next().await.unwrap()?;
				self.buffer.extend(next_block);
				self.hash = None;
			}
		}

		Ok((self.buffer.take_all(), self.hash.take()))
	}
}

#[derive(Debug, Serialize, PartialEq)]
pub struct CopyObjectResult {
	#[serde(rename = "LastModified")]
	pub last_modified: s3_xml::Value,
	#[serde(rename = "ETag")]
	pub etag: s3_xml::Value,
}

#[derive(Debug, Serialize, PartialEq)]
pub struct CopyPartResult {
	#[serde(serialize_with = "xmlns_tag")]
	pub xmlns: (),
	#[serde(rename = "LastModified")]
	pub last_modified: s3_xml::Value,
	#[serde(rename = "ETag")]
	pub etag: s3_xml::Value,
}

#[cfg(test)]
mod tests {
	use super::*;
	use crate::s3::xml::to_xml_with_header;

	#[test]
	fn copy_object_result() -> Result<(), Error> {
		let copy_result = CopyObjectResult {
			last_modified: s3_xml::Value(msec_to_rfc3339(0)),
			etag: s3_xml::Value("\"9b2cf535f27731c974343645a3985328\"".to_string()),
		};
		assert_eq!(
			to_xml_with_header(&copy_result)?,
			"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\
<CopyObjectResult>\
    <LastModified>1970-01-01T00:00:00.000Z</LastModified>\
    <ETag>&quot;9b2cf535f27731c974343645a3985328&quot;</ETag>\
</CopyObjectResult>\
			"
		);
		Ok(())
	}

	#[test]
	fn serialize_copy_part_result() -> Result<(), Error> {
		let expected_retval = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\
<CopyPartResult xmlns=\"http://s3.amazonaws.com/doc/2006-03-01/\">\
	<LastModified>2011-04-11T20:34:56.000Z</LastModified>\
	<ETag>&quot;9b2cf535f27731c974343645a3985328&quot;</ETag>\
</CopyPartResult>";
		let v = CopyPartResult {
			xmlns: (),
			last_modified: s3_xml::Value("2011-04-11T20:34:56.000Z".into()),
			etag: s3_xml::Value("\"9b2cf535f27731c974343645a3985328\"".into()),
		};
		println!("{}", to_xml_with_header(&v)?);

		assert_eq!(to_xml_with_header(&v)?, expected_retval);

		Ok(())
	}
}