130 lines
3.8 KiB
Go
130 lines
3.8 KiB
Go
package api
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import (
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"bytes"
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"context"
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"encoding/xml"
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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"github.com/google/uuid"
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"github.com/minio/minio/misc"
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)
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type (
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// APIErrorResponse - error response format
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ErrorResponse struct {
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XMLName xml.Name `xml:"Error" json:"-"`
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Code string
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Message string
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Key string `xml:"Key,omitempty" json:"Key,omitempty"`
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BucketName string `xml:"BucketName,omitempty" json:"BucketName,omitempty"`
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Resource string
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Region string `xml:"Region,omitempty" json:"Region,omitempty"`
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RequestID string `xml:"RequestId" json:"RequestId"`
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HostID string `xml:"HostId" json:"HostId"`
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}
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// APIError structure
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Error struct {
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Code string
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Description string
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HTTPStatusCode int
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}
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)
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const (
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hdrServerInfo = "Server"
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hdrAcceptRanges = "Accept-Ranges"
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hdrContentType = "Content-Type"
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hdrContentLength = "Content-Length"
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hdrRetryAfter = "Retry-After"
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hdrAmzCopySource = "X-Amz-Copy-Source"
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// Response request id.
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hdrAmzRequestID = "x-amz-request-id"
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// hdrSSE is the general AWS SSE HTTP header key.
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hdrSSE = "X-Amz-Server-Side-Encryption"
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// hdrSSECustomerKey is the HTTP header key referencing the
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// SSE-C client-provided key..
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hdrSSECustomerKey = hdrSSE + "-Customer-Key"
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// hdrSSECopyKey is the HTTP header key referencing the SSE-C
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// client-provided key for SSE-C copy requests.
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hdrSSECopyKey = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key"
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)
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var deploymentID, _ = uuid.NewRandom()
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// WriteErrorResponse writes error headers
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func WriteErrorResponse(ctx context.Context, w http.ResponseWriter, err Error, reqURL *url.URL) {
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switch err.Code {
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case "SlowDown", "XNeoFSServerNotInitialized", "XNeoFSReadQuorum", "XNeoFSWriteQuorum":
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// Set retry-after header to indicate user-agents to retry request after 120secs.
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After
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w.Header().Set(hdrRetryAfter, "120")
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case "AccessDenied":
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// TODO process when the request is from browser and also if browser
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}
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// Generate error response.
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errorResponse := getAPIErrorResponse(ctx, err, reqURL.Path,
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w.Header().Get(hdrAmzRequestID), deploymentID.String())
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encodedErrorResponse := encodeResponse(errorResponse)
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writeResponse(w, err.HTTPStatusCode, encodedErrorResponse, mimeXML)
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}
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// If none of the http routes match respond with appropriate errors
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func errorResponseHandler(w http.ResponseWriter, r *http.Request) {
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desc := fmt.Sprintf("Unknown API request at %s", r.URL.Path)
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WriteErrorResponse(r.Context(), w, Error{
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Code: "XMinioUnknownAPIRequest",
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Description: desc,
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HTTPStatusCode: http.StatusBadRequest,
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}, r.URL)
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}
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// Write http common headers
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func setCommonHeaders(w http.ResponseWriter) {
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w.Header().Set(hdrServerInfo, "NeoFS-S3-Gate/"+misc.Version)
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w.Header().Set(hdrAcceptRanges, "bytes")
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// Remove sensitive information
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removeSensitiveHeaders(w.Header())
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}
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// removeSensitiveHeaders removes confidential encryption
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// information - e.g. the SSE-C key - from the HTTP headers.
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// It has the same semantics as RemoveSensitiveEntires.
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func removeSensitiveHeaders(h http.Header) {
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h.Del(hdrSSECustomerKey)
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h.Del(hdrSSECopyKey)
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}
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func writeResponse(w http.ResponseWriter, statusCode int, response []byte, mType mimeType) {
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setCommonHeaders(w)
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if mType != mimeNone {
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w.Header().Set(hdrContentType, string(mType))
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}
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w.Header().Set(hdrContentLength, strconv.Itoa(len(response)))
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w.WriteHeader(statusCode)
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if response != nil {
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_, _ = w.Write(response)
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w.(http.Flusher).Flush()
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}
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}
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// Encodes the response headers into XML format.
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func encodeResponse(response interface{}) []byte {
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var bytesBuffer bytes.Buffer
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bytesBuffer.WriteString(xml.Header)
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_ = xml.
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NewEncoder(&bytesBuffer).
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Encode(response)
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return bytesBuffer.Bytes()
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}
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