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[#13] Rename go module name according to NSPCC standards

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- refactoring s3 gate structure
- cleanup unused code
- rename go module to `github.com/nspcc-dev/neofs-s3-gate`

closes #13

Signed-off-by: Evgeniy Kulikov <kim@nspcc.ru>
This commit is contained in:
Evgeniy Kulikov 2020-08-06 15:02:13 +03:00
parent e7f72fc670
commit 0161d2fbd3
25 changed files with 396 additions and 1112 deletions
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200
api/response.go Normal file
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package api
import (
"bytes"
"context"
"encoding/xml"
"fmt"
"net/http"
"net/url"
"strconv"
"github.com/google/uuid"
"github.com/nspcc-dev/neofs-s3-gate/misc"
)
type (
// ErrorResponse - error response format
ErrorResponse struct {
XMLName xml.Name `xml:"Error" json:"-"`
Code string
Message string
Key string `xml:"Key,omitempty" json:"Key,omitempty"`
BucketName string `xml:"BucketName,omitempty" json:"BucketName,omitempty"`
Resource string
RequestID string `xml:"RequestId" json:"RequestId"`
HostID string `xml:"HostId" json:"HostId"`
// Region where the bucket is located. This header is returned
// only in HEAD bucket and ListObjects response.
Region string `xml:"Region,omitempty" json:"Region,omitempty"`
// Captures the server string returned in response header.
Server string `xml:"-" json:"-"`
// Underlying HTTP status code for the returned error
StatusCode int `xml:"-" json:"-"`
}
// APIError structure
Error struct {
Code string
Description string
HTTPStatusCode int
}
)
const (
hdrServerInfo = "Server"
hdrAcceptRanges = "Accept-Ranges"
hdrContentType = "Content-Type"
hdrContentLength = "Content-Length"
hdrRetryAfter = "Retry-After"
hdrAmzCopySource = "X-Amz-Copy-Source"
// Response request id.
hdrAmzRequestID = "x-amz-request-id"
// hdrSSE is the general AWS SSE HTTP header key.
hdrSSE = "X-Amz-Server-Side-Encryption"
// hdrSSECustomerKey is the HTTP header key referencing the
// SSE-C client-provided key..
hdrSSECustomerKey = hdrSSE + "-Customer-Key"
// hdrSSECopyKey is the HTTP header key referencing the SSE-C
// client-provided key for SSE-C copy requests.
hdrSSECopyKey = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key"
)
var deploymentID, _ = uuid.NewRandom()
// Non exhaustive list of AWS S3 standard error responses -
// http://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
var s3ErrorResponseMap = map[string]string{
"AccessDenied": "Access Denied.",
"BadDigest": "The Content-Md5 you specified did not match what we received.",
"EntityTooSmall": "Your proposed upload is smaller than the minimum allowed object size.",
"EntityTooLarge": "Your proposed upload exceeds the maximum allowed object size.",
"IncompleteBody": "You did not provide the number of bytes specified by the Content-Length HTTP header.",
"InternalError": "We encountered an internal error, please try again.",
"InvalidAccessKeyId": "The access key ID you provided does not exist in our records.",
"InvalidBucketName": "The specified bucket is not valid.",
"InvalidDigest": "The Content-Md5 you specified is not valid.",
"InvalidRange": "The requested range is not satisfiable",
"MalformedXML": "The XML you provided was not well-formed or did not validate against our published schema.",
"MissingContentLength": "You must provide the Content-Length HTTP header.",
"MissingContentMD5": "Missing required header for this request: Content-Md5.",
"MissingRequestBodyError": "Request body is empty.",
"NoSuchBucket": "The specified bucket does not exist.",
"NoSuchBucketPolicy": "The bucket policy does not exist",
"NoSuchKey": "The specified key does not exist.",
"NoSuchUpload": "The specified multipart upload does not exist. The upload ID may be invalid, or the upload may have been aborted or completed.",
"NotImplemented": "A header you provided implies functionality that is not implemented",
"PreconditionFailed": "At least one of the pre-conditions you specified did not hold",
"RequestTimeTooSkewed": "The difference between the request time and the server's time is too large.",
"SignatureDoesNotMatch": "The request signature we calculated does not match the signature you provided. Check your key and signing method.",
"MethodNotAllowed": "The specified method is not allowed against this resource.",
"InvalidPart": "One or more of the specified parts could not be found.",
"InvalidPartOrder": "The list of parts was not in ascending order. The parts list must be specified in order by part number.",
"InvalidObjectState": "The operation is not valid for the current state of the object.",
"AuthorizationHeaderMalformed": "The authorization header is malformed; the region is wrong.",
"MalformedPOSTRequest": "The body of your POST request is not well-formed multipart/form-data.",
"BucketNotEmpty": "The bucket you tried to delete is not empty",
"AllAccessDisabled": "All access to this bucket has been disabled.",
"MalformedPolicy": "Policy has invalid resource.",
"MissingFields": "Missing fields in request.",
"AuthorizationQueryParametersError": "Error parsing the X-Amz-Credential parameter; the Credential is mal-formed; expecting \"<YOUR-AKID>/YYYYMMDD/REGION/SERVICE/aws4_request\".",
"MalformedDate": "Invalid date format header, expected to be in ISO8601, RFC1123 or RFC1123Z time format.",
"BucketAlreadyOwnedByYou": "Your previous request to create the named bucket succeeded and you already own it.",
"InvalidDuration": "Duration provided in the request is invalid.",
"XAmzContentSHA256Mismatch": "The provided 'x-amz-content-sha256' header does not match what was computed.",
// Add new API errors here.
}
// WriteErrorResponse writes error headers
func WriteErrorResponse(ctx context.Context, w http.ResponseWriter, err Error, reqURL *url.URL) {
switch err.Code {
case "SlowDown", "XNeoFSServerNotInitialized", "XNeoFSReadQuorum", "XNeoFSWriteQuorum":
// Set retry-after header to indicate user-agents to retry request after 120secs.
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After
w.Header().Set(hdrRetryAfter, "120")
case "AccessDenied":
// TODO process when the request is from browser and also if browser
}
// Generate error response.
errorResponse := getAPIErrorResponse(ctx, err, reqURL.Path,
w.Header().Get(hdrAmzRequestID), deploymentID.String())
encodedErrorResponse := EncodeResponse(errorResponse)
writeResponse(w, err.HTTPStatusCode, encodedErrorResponse, mimeXML)
}
// If none of the http routes match respond with appropriate errors
func errorResponseHandler(w http.ResponseWriter, r *http.Request) {
desc := fmt.Sprintf("Unknown API request at %s", r.URL.Path)
WriteErrorResponse(r.Context(), w, Error{
Code: "XMinioUnknownAPIRequest",
Description: desc,
HTTPStatusCode: http.StatusBadRequest,
}, r.URL)
}
// Write http common headers
func setCommonHeaders(w http.ResponseWriter) {
w.Header().Set(hdrServerInfo, "NeoFS-S3-Gate/"+misc.Version)
w.Header().Set(hdrAcceptRanges, "bytes")
// Remove sensitive information
removeSensitiveHeaders(w.Header())
}
// removeSensitiveHeaders removes confidential encryption
// information - e.g. the SSE-C key - from the HTTP headers.
// It has the same semantics as RemoveSensitiveEntries.
func removeSensitiveHeaders(h http.Header) {
h.Del(hdrSSECustomerKey)
h.Del(hdrSSECopyKey)
}
func writeResponse(w http.ResponseWriter, statusCode int, response []byte, mType mimeType) {
setCommonHeaders(w)
if mType != mimeNone {
w.Header().Set(hdrContentType, string(mType))
}
w.Header().Set(hdrContentLength, strconv.Itoa(len(response)))
w.WriteHeader(statusCode)
if response != nil {
_, _ = w.Write(response)
w.(http.Flusher).Flush()
}
}
// EncodeResponse encodes the response headers into XML format.
func EncodeResponse(response interface{}) []byte {
var bytesBuffer bytes.Buffer
bytesBuffer.WriteString(xml.Header)
_ = xml.
NewEncoder(&bytesBuffer).
Encode(response)
return bytesBuffer.Bytes()
}
// WriteSuccessResponseXML writes success headers and response if any,
// with content-type set to `application/xml`.
func WriteSuccessResponseXML(w http.ResponseWriter, response []byte) {
writeResponse(w, http.StatusOK, response, mimeXML)
}
// Error - Returns S3 error string.
func (e ErrorResponse) Error() string {
if e.Message == "" {
msg, ok := s3ErrorResponseMap[e.Code]
if !ok {
msg = fmt.Sprintf("Error response code %s.", e.Code)
}
return msg
}
return e.Message
}