* s3: HEAD with partNumber reports the part's size and range
HeadObject set its headers from the total object size and then only
validated the partNumber, so a client probing part 1 with HEAD got the
whole object's Content-Length and a 200 while the same GET returned the
part's size, a Content-Range and a 206.
Resolve the part's byte range before the headers are written, through the
range logic GetObject already used, and answer a partNumber HEAD as the
ranged HEAD that AWS documents.
* s3: answer an unsatisfiable partNumber with 416 InvalidPartNumber
GET and HEAD rejected a partNumber past the number of parts with 400
InvalidPart, the code for a missing part in CompleteMultipartUpload. AWS
answers a read of a part that does not exist with 416 InvalidPartNumber,
which lets a client probing for the part count tell the two apart.
The ceph suite pins RGW's 400 InvalidPart here, so the s3tests jobs patch
that expectation the way they already patch prefix ordering.
* s3: keep the whole-object checksum off a partNumber response
The stored checksum covers the whole object, so it is already withheld
from a ranged read. A partNumber HEAD now describes one part while the
request carries no Range header, so exclude it there too rather than
handing a client a checksum that does not match the bytes described.
* s3: resolve a partNumber against the parts the object records
Completion accepts ascending, not consecutive, part numbers, so the part
count is not the highest part number. Comparing the two rejected an
uploaded part 3 of a two-part object, and let a request for the absent
part 2 fall through to the positional chunk lookup and serve part 3's
bytes. Ask the recorded boundaries for the part instead, and keep the
count comparison for objects written before boundaries were stored.
* s3: apply a client Range within the part on HEAD too
GET narrowed the part by a Range sent alongside partNumber; HEAD reported
the whole part, so the two disagreed again for a request that carries
both. Move the narrowing into the shared range lookup so either verb
describes the same bytes.
see https://blog.aqwari.net/xml-schema-go/
1. go get aqwari.net/xml/cmd/xsdgen
2. Add EncodingType element for ListBucketResult in AmazonS3.xsd
3. xsdgen -o s3api_xsd_generated.go -pkg s3api AmazonS3.xsd
4. Remove empty Grantee struct in s3api_xsd_generated.go
5. Remove xmlns: sed s'/http:\/\/s3.amazonaws.com\/doc\/2006-03-01\/\ //' s3api_xsd_generated.go
Chris Lu
5a515adab2