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, 11 insertions, 9 deletions

diff --git a/src/api/signature/payload.rs b/src/api/signature/payload.rs
index 9137dd2d..4c7934e5 100644
--- a/src/api/signature/payload.rs
+++ b/src/api/signature/payload.rs
@@ -15,7 +15,7 @@ use super::LONG_DATETIME;
 use super::{compute_scope, signing_hmac};
 
 use crate::encoding::uri_encode;
-use crate::error::*;
+use crate::signature::error::*;
 
 pub async fn check_payload_signature(
 	garage: &Garage,
@@ -105,7 +105,7 @@ fn parse_authorization(
 	let (auth_kind, rest) = authorization.split_at(first_space);
 
 	if auth_kind != "AWS4-HMAC-SHA256" {
-		return Err(Error::BadRequest("Unsupported authorization method".into()));
+		return Err(Error::bad_request("Unsupported authorization method"));
 	}
 
 	let mut auth_params = HashMap::new();
@@ -129,10 +129,11 @@ fn parse_authorization(
 	let date = headers
 		.get("x-amz-date")
 		.ok_or_bad_request("Missing X-Amz-Date field")
+		.map_err(Error::from)
 		.and_then(|d| parse_date(d))?;
 
 	if Utc::now() - date > Duration::hours(24) {
-		return Err(Error::BadRequest("Date is too old".to_string()));
+		return Err(Error::bad_request("Date is too old".to_string()));
 	}
 
 	let auth = Authorization {
@@ -156,7 +157,7 @@ fn parse_query_authorization(
 	headers: &HashMap<String, String>,
 ) -> Result<Authorization, Error> {
 	if algorithm != "AWS4-HMAC-SHA256" {
-		return Err(Error::BadRequest(
+		return Err(Error::bad_request(
 			"Unsupported authorization method".to_string(),
 		));
 	}
@@ -179,10 +180,10 @@ fn parse_query_authorization(
 		.get("x-amz-expires")
 		.ok_or_bad_request("X-Amz-Expires not found in query parameters")?
 		.parse()
-		.map_err(|_| Error::BadRequest("X-Amz-Expires is not a number".to_string()))?;
+		.map_err(|_| Error::bad_request("X-Amz-Expires is not a number".to_string()))?;
 
 	if duration > 7 * 24 * 3600 {
-		return Err(Error::BadRequest(
+		return Err(Error::bad_request(
 			"X-Amz-Exprires may not exceed a week".to_string(),
 		));
 	}
@@ -190,10 +191,11 @@ fn parse_query_authorization(
 	let date = headers
 		.get("x-amz-date")
 		.ok_or_bad_request("Missing X-Amz-Date field")
+		.map_err(Error::from)
 		.and_then(|d| parse_date(d))?;
 
 	if Utc::now() - date > Duration::seconds(duration) {
-		return Err(Error::BadRequest("Date is too old".to_string()));
+		return Err(Error::bad_request("Date is too old".to_string()));
 	}
 
 	Ok(Authorization {
@@ -301,7 +303,7 @@ pub async fn verify_v4(
 		.get(&EmptyKey, &key_id)
 		.await?
 		.filter(|k| !k.state.is_deleted())
-		.ok_or_else(|| Error::Forbidden(format!("No such key: {}", &key_id)))?;
+		.ok_or_else(|| Error::forbidden(format!("No such key: {}", &key_id)))?;
 	let key_p = key.params().unwrap();
 
 	let mut hmac = signing_hmac(
@@ -314,7 +316,7 @@ pub async fn verify_v4(
 	hmac.update(payload);
 	let our_signature = hex::encode(hmac.finalize().into_bytes());
 	if signature != our_signature {
-		return Err(Error::Forbidden("Invalid signature".to_string()));
+		return Err(Error::forbidden("Invalid signature".to_string()));
 	}
 
 	Ok(key)