296 lines
8.4 KiB
Go
296 lines
8.4 KiB
Go
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/*
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* MinIO Go Library for Amazon S3 Compatible Cloud Storage
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* Copyright 2015-2020 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package minio
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import (
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"bytes"
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"encoding/xml"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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)
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/* **** SAMPLE ERROR RESPONSE ****
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<?xml version="1.0" encoding="UTF-8"?>
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<Error>
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<Code>AccessDenied</Code>
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<Message>Access Denied</Message>
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<BucketName>bucketName</BucketName>
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<Key>objectName</Key>
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<RequestId>F19772218238A85A</RequestId>
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<HostId>GuWkjyviSiGHizehqpmsD1ndz5NClSP19DOT+s2mv7gXGQ8/X1lhbDGiIJEXpGFD</HostId>
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</Error>
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*/
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// ErrorResponse - Is the typed error returned by all API operations.
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// ErrorResponse struct should be comparable since it is compared inside
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// golang http API (https://github.com/golang/go/issues/29768)
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type 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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BucketName string
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Key string
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Resource string
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RequestID string `xml:"RequestId"`
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HostID string `xml:"HostId"`
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// Region where the bucket is located. This header is returned
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// only in HEAD bucket and ListObjects response.
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Region string
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// Captures the server string returned in response header.
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Server string
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// Underlying HTTP status code for the returned error
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StatusCode int `xml:"-" json:"-"`
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}
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// ToErrorResponse - Returns parsed ErrorResponse struct from body and
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// http headers.
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//
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// For example:
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//
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// import s3 "github.com/minio/minio-go/v7"
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// ...
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// ...
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// reader, stat, err := s3.GetObject(...)
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// if err != nil {
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// resp := s3.ToErrorResponse(err)
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// }
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// ...
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func ToErrorResponse(err error) ErrorResponse {
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switch err := err.(type) {
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case ErrorResponse:
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return err
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default:
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return ErrorResponse{}
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}
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}
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// Error - Returns S3 error string.
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func (e ErrorResponse) Error() string {
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if e.Message == "" {
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msg, ok := s3ErrorResponseMap[e.Code]
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if !ok {
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msg = fmt.Sprintf("Error response code %s.", e.Code)
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}
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return msg
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}
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return e.Message
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}
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// Common string for errors to report issue location in unexpected
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// cases.
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const (
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reportIssue = "Please report this issue at https://github.com/minio/minio-go/issues."
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)
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// xmlDecodeAndBody reads the whole body up to 1MB and
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// tries to XML decode it into v.
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// The body that was read and any error from reading or decoding is returned.
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func xmlDecodeAndBody(bodyReader io.Reader, v interface{}) ([]byte, error) {
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// read the whole body (up to 1MB)
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const maxBodyLength = 1 << 20
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body, err := ioutil.ReadAll(io.LimitReader(bodyReader, maxBodyLength))
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if err != nil {
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return nil, err
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}
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return bytes.TrimSpace(body), xmlDecoder(bytes.NewReader(body), v)
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}
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// httpRespToErrorResponse returns a new encoded ErrorResponse
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// structure as error.
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func httpRespToErrorResponse(resp *http.Response, bucketName, objectName string) error {
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if resp == nil {
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msg := "Empty http response. " + reportIssue
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return errInvalidArgument(msg)
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}
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errResp := ErrorResponse{
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StatusCode: resp.StatusCode,
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Server: resp.Header.Get("Server"),
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}
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errBody, err := xmlDecodeAndBody(resp.Body, &errResp)
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// Xml decoding failed with no body, fall back to HTTP headers.
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if err != nil {
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switch resp.StatusCode {
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case http.StatusNotFound:
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if objectName == "" {
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errResp = ErrorResponse{
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StatusCode: resp.StatusCode,
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Code: "NoSuchBucket",
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Message: "The specified bucket does not exist.",
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BucketName: bucketName,
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}
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} else {
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errResp = ErrorResponse{
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StatusCode: resp.StatusCode,
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Code: "NoSuchKey",
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Message: "The specified key does not exist.",
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BucketName: bucketName,
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Key: objectName,
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}
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}
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case http.StatusForbidden:
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errResp = ErrorResponse{
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StatusCode: resp.StatusCode,
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Code: "AccessDenied",
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Message: "Access Denied.",
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BucketName: bucketName,
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Key: objectName,
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}
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case http.StatusConflict:
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errResp = ErrorResponse{
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StatusCode: resp.StatusCode,
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Code: "Conflict",
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Message: "Bucket not empty.",
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BucketName: bucketName,
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}
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case http.StatusPreconditionFailed:
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errResp = ErrorResponse{
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StatusCode: resp.StatusCode,
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Code: "PreconditionFailed",
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Message: s3ErrorResponseMap["PreconditionFailed"],
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BucketName: bucketName,
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Key: objectName,
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}
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default:
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msg := resp.Status
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if len(errBody) > 0 {
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msg = string(errBody)
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if len(msg) > 1024 {
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msg = msg[:1024] + "..."
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}
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}
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errResp = ErrorResponse{
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StatusCode: resp.StatusCode,
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Code: resp.Status,
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Message: msg,
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BucketName: bucketName,
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}
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}
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}
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// Save hostID, requestID and region information
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// from headers if not available through error XML.
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if errResp.RequestID == "" {
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errResp.RequestID = resp.Header.Get("x-amz-request-id")
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}
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if errResp.HostID == "" {
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errResp.HostID = resp.Header.Get("x-amz-id-2")
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}
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if errResp.Region == "" {
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errResp.Region = resp.Header.Get("x-amz-bucket-region")
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}
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if errResp.Code == "InvalidRegion" && errResp.Region != "" {
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errResp.Message = fmt.Sprintf("Region does not match, expecting region ‘%s’.", errResp.Region)
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}
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return errResp
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}
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// errTransferAccelerationBucket - bucket name is invalid to be used with transfer acceleration.
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func errTransferAccelerationBucket(bucketName string) error {
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return ErrorResponse{
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StatusCode: http.StatusBadRequest,
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Code: "InvalidArgument",
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Message: "The name of the bucket used for Transfer Acceleration must be DNS-compliant and must not contain periods ‘.’.",
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BucketName: bucketName,
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}
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}
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// errEntityTooLarge - Input size is larger than supported maximum.
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func errEntityTooLarge(totalSize, maxObjectSize int64, bucketName, objectName string) error {
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msg := fmt.Sprintf("Your proposed upload size ‘%d’ exceeds the maximum allowed object size ‘%d’ for single PUT operation.", totalSize, maxObjectSize)
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return ErrorResponse{
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StatusCode: http.StatusBadRequest,
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Code: "EntityTooLarge",
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Message: msg,
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BucketName: bucketName,
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Key: objectName,
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}
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}
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// errEntityTooSmall - Input size is smaller than supported minimum.
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func errEntityTooSmall(totalSize int64, bucketName, objectName string) error {
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msg := fmt.Sprintf("Your proposed upload size ‘%d’ is below the minimum allowed object size ‘0B’ for single PUT operation.", totalSize)
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return ErrorResponse{
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StatusCode: http.StatusBadRequest,
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Code: "EntityTooSmall",
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Message: msg,
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BucketName: bucketName,
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Key: objectName,
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}
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}
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// errUnexpectedEOF - Unexpected end of file reached.
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func errUnexpectedEOF(totalRead, totalSize int64, bucketName, objectName string) error {
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msg := fmt.Sprintf("Data read ‘%d’ is not equal to the size ‘%d’ of the input Reader.", totalRead, totalSize)
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return ErrorResponse{
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StatusCode: http.StatusBadRequest,
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Code: "UnexpectedEOF",
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Message: msg,
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BucketName: bucketName,
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Key: objectName,
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}
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}
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// errInvalidBucketName - Invalid bucket name response.
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func errInvalidBucketName(message string) error {
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return ErrorResponse{
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StatusCode: http.StatusBadRequest,
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Code: "InvalidBucketName",
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Message: message,
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RequestID: "minio",
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}
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}
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// errInvalidObjectName - Invalid object name response.
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func errInvalidObjectName(message string) error {
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return ErrorResponse{
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StatusCode: http.StatusNotFound,
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Code: "NoSuchKey",
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Message: message,
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RequestID: "minio",
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}
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}
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// errInvalidArgument - Invalid argument response.
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func errInvalidArgument(message string) error {
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return ErrorResponse{
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StatusCode: http.StatusBadRequest,
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Code: "InvalidArgument",
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Message: message,
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RequestID: "minio",
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}
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}
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// errAPINotSupported - API not supported response
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// The specified API call is not supported
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func errAPINotSupported(message string) error {
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return ErrorResponse{
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StatusCode: http.StatusNotImplemented,
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Code: "APINotSupported",
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Message: message,
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RequestID: "minio",
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}
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}
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