First version of admin API (#298)

**Spec:**

- [x] Start writing
- [x] Specify all layout endpoints
- [x] Specify all endpoints for operations on keys
- [x] Specify all endpoints for operations on key/bucket permissions
- [x] Specify all endpoints for operations on buckets
- [x] Specify all endpoints for operations on bucket aliases

View rendered spec at <https://git.deuxfleurs.fr/Deuxfleurs/garage/src/branch/admin-api/doc/drafts/admin-api.md>

**Code:**

- [x] Refactor code for admin api to use common api code that was created for K2V

**General endpoints:**

- [x] Metrics
- [x] GetClusterStatus
- [x] ConnectClusterNodes
- [x] GetClusterLayout
- [x] UpdateClusterLayout
- [x] ApplyClusterLayout
- [x] RevertClusterLayout

**Key-related endpoints:**

- [x] ListKeys
- [x] CreateKey
- [x] ImportKey
- [x] GetKeyInfo
- [x] UpdateKey
- [x] DeleteKey

**Bucket-related endpoints:**

- [x] ListBuckets
- [x] CreateBucket
- [x] GetBucketInfo
- [x] DeleteBucket
- [x] PutBucketWebsite
- [x] DeleteBucketWebsite

**Operations on key/bucket permissions:**

- [x] BucketAllowKey
- [x] BucketDenyKey

**Operations on bucket aliases:**

- [x] GlobalAliasBucket
- [x] GlobalUnaliasBucket
- [x] LocalAliasBucket
- [x] LocalUnaliasBucket

**And also:**

- [x] Separate error type for the admin API (this PR includes a quite big refactoring of error handling)
- [x] Add management of website access
- [ ] Check that nothing is missing wrt what can be done using the CLI
- [ ] Improve formatting of the spec
- [x] Make sure everyone is cool with the API design

Fix #231
Fix #295

Co-authored-by: Alex Auvolat <alex@adnab.me>
Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/298
Co-authored-by: Alex <alex@adnab.me>
Co-committed-by: Alex <alex@adnab.me>

1 files changed, 2 insertions, 3 deletions

diff --git a/src/api/s3/router.rs b/src/api/s3/router.rs
index 0525c649..44f581ff 100644
--- a/src/api/s3/router.rs
+++ b/src/api/s3/router.rs
@@ -1,5 +1,3 @@
-use crate::error::{Error, OkOrBadRequest};
-
 use std::borrow::Cow;
 
 use hyper::header::HeaderValue;
@@ -7,6 +5,7 @@ use hyper::{HeaderMap, Method, Request};
 
 use crate::helpers::Authorization;
 use crate::router_macros::{generateQueryParameters, router_match};
+use crate::s3::error::*;
 
 router_match! {@func
 
@@ -343,7 +342,7 @@ impl Endpoint {
 			Method::POST => Self::from_post(key, &mut query)?,
 			Method::PUT => Self::from_put(key, &mut query, req.headers())?,
 			Method::DELETE => Self::from_delete(key, &mut query)?,
-			_ => return Err(Error::BadRequest("Unknown method".to_owned())),
+			_ => return Err(Error::bad_request("Unknown method")),
 		};
 
 		if let Some(message) = query.nonempty_message() {