frostfs-s3-gw/README.md

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# NeoFS S3 Gateway
NeoFS S3 gateway provides API compatible with Amazon S3 cloud storage service.
## Installation
```go get -u github.com/nspcc-dev/neofs-s3-gw```
Or you can call `make` to build it from the cloned repository (the binary will
end up in `bin/neofs-s3-gw` with authmate helper in `bin/neofs-authmate`).
To build binaries in clean docker environment, call `make docker/all`.
Other notable make targets:
```
dep Check and ensure dependencies
image Build clean docker image
dirty-image Build dirty docker image with host-built binaries
format Run all code formatters
lint Run linters
version Show current version
```
Or you can also use a [Docker
image](https://hub.docker.com/r/nspccdev/neofs-s3-gw) provided for released
(and occasionally unreleased) versions of gateway (`:latest` points to the
latest stable release).
## Execution
Minimalistic S3 gateway setup needs:
* NeoFS node(s) address (S3 gateway itself is not a NeoFS node)
Passed via `-p` parameter or via `S3_GW_PEERS_<N>_ADDRESS` and
`S3_GW_PEERS_<N>_WEIGHT` environment variables (gateway supports multiple
NeoFS nodes with weighted load balancing).
* a wallet used to fetch key and communicate with NeoFS nodes
Passed via `--wallet` parameter or `S3_GW_WALLET` environment variable.
These two commands are functionally equivalent, they run the gate with one
backend node, some keys and otherwise default settings:
```
$ neofs-s3-gw -p 192.168.130.72:8080 --wallet wallet.json
$ S3_GW_PEERS_0_ADDRESS=192.168.130.72:8080 \
S3_GW_WALLET=wallet.json \
neofs-s3-gw
```
It's also possible to specify uri scheme (grpc or grpcs) when using `-p` or environment variables:
```
$ neofs-s3-gw -p grpc://192.168.130.72:8080 --wallet wallet.json
$ S3_GW_PEERS_0_ADDRESS=grpcs://192.168.130.72:8080 \
S3_GW_WALLET=wallet.json \
neofs-s3-gw
```
## AWS SDK Compatibility
To match signature of the request you must not include the following headers to `SignedHeaders`:
* `User-Agent`
* `X-Amzn-Trace-Id`
### AWS SDK JAVA v1
Using [aws-sdk-java](https://github.com/aws/aws-sdk-java) you can get the following error:
```
Exception in thread "main" com.amazonaws.services.s3.model.AmazonS3Exception:
The request signature we calculated does not match the signature you provided. Check your key and signing method.
```
To solve this problem you should configure client properly:
```
RequestHandler2 handler = new RequestHandler2() {
@Override
public void beforeAttempt(HandlerBeforeAttemptContext context) {
context.getRequest().getHeaders().remove("User-Agent");
super.beforeAttempt(context);
}
};
AmazonS3 s3Client = AmazonS3ClientBuilder.standard()
.withRequestHandlers(handler)
.enablePathStyleAccess()
// ...
.build()
```
## Documentation
- [Configuration](./docs/configuration.md)
- [NeoFS AuthMate](./docs/authmate.md)
- [AWS CLI basic usage](./docs/aws_cli.md)
- [AWS S3 API compatibility](./docs/aws_s3_compat.md)
- [AWS S3 Compatibility test results](./docs/s3_test_results.md)