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minio/cmd/web-handlers.go

1021 lines
29 KiB

/*
* Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"archive/zip"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path"
"runtime"
"strconv"
"strings"
"time"
"github.com/dustin/go-humanize"
"github.com/gorilla/mux"
"github.com/gorilla/rpc/v2/json2"
"github.com/minio/minio-go/pkg/policy"
"github.com/minio/minio/browser"
)
// WebGenericArgs - empty struct for calls that don't accept arguments
// for ex. ServerInfo, GenerateAuth
type WebGenericArgs struct{}
// WebGenericRep - reply structure for calls for which reply is success/failure
// for ex. RemoveObject MakeBucket
type WebGenericRep struct {
UIVersion string `json:"uiVersion"`
}
// ServerInfoRep - server info reply.
type ServerInfoRep struct {
MinioVersion string
MinioMemory string
MinioPlatform string
MinioRuntime string
MinioGlobalInfo map[string]interface{}
UIVersion string `json:"uiVersion"`
}
// ServerInfo - get server info.
func (web *webAPIHandlers) ServerInfo(r *http.Request, args *WebGenericArgs, reply *ServerInfoRep) error {
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
host, err := os.Hostname()
if err != nil {
host = ""
}
memstats := &runtime.MemStats{}
runtime.ReadMemStats(memstats)
mem := fmt.Sprintf("Used: %s | Allocated: %s | Used-Heap: %s | Allocated-Heap: %s",
humanize.Bytes(memstats.Alloc),
humanize.Bytes(memstats.TotalAlloc),
humanize.Bytes(memstats.HeapAlloc),
humanize.Bytes(memstats.HeapSys))
platform := fmt.Sprintf("Host: %s | OS: %s | Arch: %s",
host,
runtime.GOOS,
runtime.GOARCH)
goruntime := fmt.Sprintf("Version: %s | CPUs: %s", runtime.Version(), strconv.Itoa(runtime.NumCPU()))
reply.MinioVersion = Version
reply.MinioGlobalInfo = getGlobalInfo()
reply.MinioMemory = mem
reply.MinioPlatform = platform
reply.MinioRuntime = goruntime
reply.UIVersion = browser.UIVersion
return nil
}
// StorageInfoRep - contains storage usage statistics.
type StorageInfoRep struct {
StorageInfo StorageInfo `json:"storageInfo"`
UIVersion string `json:"uiVersion"`
}
// StorageInfo - web call to gather storage usage statistics.
func (web *webAPIHandlers) StorageInfo(r *http.Request, args *AuthRPCArgs, reply *StorageInfoRep) error {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
reply.StorageInfo = objectAPI.StorageInfo()
reply.UIVersion = browser.UIVersion
return nil
}
// MakeBucketArgs - make bucket args.
type MakeBucketArgs struct {
BucketName string `json:"bucketName"`
}
// MakeBucket - creates a new bucket.
func (web *webAPIHandlers) MakeBucket(r *http.Request, args *MakeBucketArgs, reply *WebGenericRep) error {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
// Check if bucket is a reserved bucket name.
if isMinioMetaBucket(args.BucketName) || isMinioReservedBucket(args.BucketName) {
return toJSONError(errReservedBucket)
}
bucketLock := globalNSMutex.NewNSLock(args.BucketName, "")
bucketLock.Lock()
defer bucketLock.Unlock()
if err := objectAPI.MakeBucket(args.BucketName); err != nil {
return toJSONError(err, args.BucketName)
}
reply.UIVersion = browser.UIVersion
return nil
}
// ListBucketsRep - list buckets response
type ListBucketsRep struct {
Buckets []WebBucketInfo `json:"buckets"`
UIVersion string `json:"uiVersion"`
}
// WebBucketInfo container for list buckets metadata.
type WebBucketInfo struct {
// The name of the bucket.
Name string `json:"name"`
// Date the bucket was created.
CreationDate time.Time `json:"creationDate"`
}
// ListBuckets - list buckets api.
func (web *webAPIHandlers) ListBuckets(r *http.Request, args *WebGenericArgs, reply *ListBucketsRep) error {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
authErr := webRequestAuthenticate(r)
if authErr != nil {
return toJSONError(authErr)
}
buckets, err := objectAPI.ListBuckets()
if err != nil {
return toJSONError(err)
}
for _, bucket := range buckets {
reply.Buckets = append(reply.Buckets, WebBucketInfo{
Name: bucket.Name,
CreationDate: bucket.Created,
})
}
reply.UIVersion = browser.UIVersion
return nil
}
// ListObjectsArgs - list object args.
type ListObjectsArgs struct {
BucketName string `json:"bucketName"`
Prefix string `json:"prefix"`
Marker string `json:"marker"`
}
// ListObjectsRep - list objects response.
type ListObjectsRep struct {
Objects []WebObjectInfo `json:"objects"`
NextMarker string `json:"nextmarker"`
IsTruncated bool `json:"istruncated"`
Writable bool `json:"writable"` // Used by client to show "upload file" button.
UIVersion string `json:"uiVersion"`
}
// WebObjectInfo container for list objects metadata.
type WebObjectInfo struct {
// Name of the object
Key string `json:"name"`
// Date and time the object was last modified.
LastModified time.Time `json:"lastModified"`
// Size in bytes of the object.
Size int64 `json:"size"`
// ContentType is mime type of the object.
ContentType string `json:"contentType"`
}
// ListObjects - list objects api.
func (web *webAPIHandlers) ListObjects(r *http.Request, args *ListObjectsArgs, reply *ListObjectsRep) error {
reply.UIVersion = browser.UIVersion
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
prefix := args.Prefix + "test" // To test if GetObject/PutObject with the specified prefix is allowed.
readable := isBucketActionAllowed("s3:GetObject", args.BucketName, prefix)
writable := isBucketActionAllowed("s3:PutObject", args.BucketName, prefix)
authErr := webRequestAuthenticate(r)
switch {
case authErr == errAuthentication:
return toJSONError(authErr)
case authErr == nil:
break
case readable && writable:
reply.Writable = true
break
case readable:
break
case writable:
reply.Writable = true
return nil
default:
return errAuthentication
}
lo, err := objectAPI.ListObjects(args.BucketName, args.Prefix, args.Marker, slashSeparator, 1000)
if err != nil {
return &json2.Error{Message: err.Error()}
}
reply.NextMarker = lo.NextMarker
reply.IsTruncated = lo.IsTruncated
for _, obj := range lo.Objects {
reply.Objects = append(reply.Objects, WebObjectInfo{
Key: obj.Name,
LastModified: obj.ModTime,
Size: obj.Size,
ContentType: obj.ContentType,
})
}
for _, prefix := range lo.Prefixes {
reply.Objects = append(reply.Objects, WebObjectInfo{
Key: prefix,
})
}
return nil
}
// RemoveObjectArgs - args to remove an object, JSON will look like.
//
// {
// "bucketname": "testbucket",
// "objects": [
// "photos/hawaii/",
// "photos/maldives/",
// "photos/sanjose.jpg"
// ]
// }
type RemoveObjectArgs struct {
Objects []string `json:"objects"` // Contains objects, prefixes.
BucketName string `json:"bucketname"` // Contains bucket name.
}
// RemoveObject - removes an object, or all the objects at a given prefix.
func (web *webAPIHandlers) RemoveObject(r *http.Request, args *RemoveObjectArgs, reply *WebGenericRep) error {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
if args.BucketName == "" || len(args.Objects) == 0 {
return toJSONError(errInvalidArgument)
}
var err error
next:
for _, objectName := range args.Objects {
// If not a directory, remove the object.
if !hasSuffix(objectName, slashSeparator) && objectName != "" {
if err = deleteObject(objectAPI, args.BucketName, objectName, r); err != nil {
break next
}
continue
}
// For directories, list the contents recursively and remove.
marker := ""
for {
var lo ListObjectsInfo
lo, err = objectAPI.ListObjects(args.BucketName, objectName, marker, "", 1000)
if err != nil {
break next
}
marker = lo.NextMarker
for _, obj := range lo.Objects {
err = deleteObject(objectAPI, args.BucketName, obj.Name, r)
if err != nil {
break next
}
}
if !lo.IsTruncated {
break
}
}
}
if err != nil && !isErrObjectNotFound(err) {
// Ignore object not found error.
return toJSONError(err, args.BucketName, "")
}
reply.UIVersion = browser.UIVersion
return nil
}
// LoginArgs - login arguments.
type LoginArgs struct {
Username string `json:"username" form:"username"`
Password string `json:"password" form:"password"`
}
// LoginRep - login reply.
type LoginRep struct {
Token string `json:"token"`
UIVersion string `json:"uiVersion"`
}
// Login - user login handler.
func (web *webAPIHandlers) Login(r *http.Request, args *LoginArgs, reply *LoginRep) error {
token, err := authenticateWeb(args.Username, args.Password)
if err != nil {
// Make sure to log errors related to browser login,
// for security and auditing reasons.
errorIf(err, "Unable to login request from %s", r.RemoteAddr)
return toJSONError(err)
}
reply.Token = token
reply.UIVersion = browser.UIVersion
return nil
}
// GenerateAuthReply - reply for GenerateAuth
type GenerateAuthReply struct {
AccessKey string `json:"accessKey"`
SecretKey string `json:"secretKey"`
UIVersion string `json:"uiVersion"`
}
func (web webAPIHandlers) GenerateAuth(r *http.Request, args *WebGenericArgs, reply *GenerateAuthReply) error {
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
cred := mustGetNewCredential()
reply.AccessKey = cred.AccessKey
reply.SecretKey = cred.SecretKey
reply.UIVersion = browser.UIVersion
return nil
}
// SetAuthArgs - argument for SetAuth
type SetAuthArgs struct {
AccessKey string `json:"accessKey"`
SecretKey string `json:"secretKey"`
}
// SetAuthReply - reply for SetAuth
type SetAuthReply struct {
Token string `json:"token"`
UIVersion string `json:"uiVersion"`
PeerErrMsgs map[string]string `json:"peerErrMsgs"`
}
// SetAuth - Set accessKey and secretKey credentials.
func (web *webAPIHandlers) SetAuth(r *http.Request, args *SetAuthArgs, reply *SetAuthReply) error {
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
// If creds are set through ENV disallow changing credentials.
if globalIsEnvCreds {
return toJSONError(errChangeCredNotAllowed)
}
creds, err := createCredential(args.AccessKey, args.SecretKey)
if err != nil {
return toJSONError(err)
}
// Notify all other Minio peers to update credentials
errsMap := updateCredsOnPeers(creds)
// Update local credentials
serverConfig.SetCredential(creds)
// Persist updated credentials.
if err = serverConfig.Save(); err != nil {
errsMap[globalMinioAddr] = err
}
// Log all the peer related error messages, and populate the
// PeerErrMsgs map.
reply.PeerErrMsgs = make(map[string]string)
for svr, errVal := range errsMap {
tErr := fmt.Errorf("Unable to change credentials on %s: %v", svr, errVal)
errorIf(tErr, "Credentials change could not be propagated successfully!")
reply.PeerErrMsgs[svr] = errVal.Error()
}
// If we were unable to update locally, we return an error to the user/browser.
if errsMap[globalMinioAddr] != nil {
// Since the error message may be very long to display
// on the browser, we tell the user to check the
// server logs.
return toJSONError(errors.New("unexpected error(s) occurred - please check minio server logs"))
}
// As we have updated access/secret key, generate new auth token.
token, err := authenticateWeb(creds.AccessKey, creds.SecretKey)
if err != nil {
// Did we have peer errors?
if len(errsMap) > 0 {
err = fmt.Errorf(
"we gave up due to: '%s', but there were more errors. Please check minio server logs",
err.Error(),
)
}
return toJSONError(err)
}
reply.Token = token
reply.UIVersion = browser.UIVersion
return nil
}
// GetAuthReply - Reply current credentials.
type GetAuthReply struct {
AccessKey string `json:"accessKey"`
SecretKey string `json:"secretKey"`
UIVersion string `json:"uiVersion"`
}
// GetAuth - return accessKey and secretKey credentials.
func (web *webAPIHandlers) GetAuth(r *http.Request, args *WebGenericArgs, reply *GetAuthReply) error {
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
creds := serverConfig.GetCredential()
reply.AccessKey = creds.AccessKey
reply.SecretKey = creds.SecretKey
reply.UIVersion = browser.UIVersion
return nil
}
// Upload - file upload handler.
func (web *webAPIHandlers) Upload(w http.ResponseWriter, r *http.Request) {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
writeWebErrorResponse(w, errServerNotInitialized)
return
}
vars := mux.Vars(r)
bucket := vars["bucket"]
object := vars["object"]
authErr := webRequestAuthenticate(r)
if authErr == errAuthentication {
writeWebErrorResponse(w, errAuthentication)
return
}
if authErr != nil && !isBucketActionAllowed("s3:PutObject", bucket, object) {
writeWebErrorResponse(w, errAuthentication)
return
}
// Require Content-Length to be set in the request
size := r.ContentLength
if size < 0 {
writeWebErrorResponse(w, errSizeUnspecified)
return
}
// Extract incoming metadata if any.
metadata := extractMetadataFromHeader(r.Header)
// Lock the object.
objectLock := globalNSMutex.NewNSLock(bucket, object)
objectLock.Lock()
defer objectLock.Unlock()
sha256sum := ""
objInfo, err := objectAPI.PutObject(bucket, object, size, r.Body, metadata, sha256sum)
if err != nil {
writeWebErrorResponse(w, err)
return
}
// Notify object created event.
eventNotify(eventData{
Type: ObjectCreatedPut,
Bucket: bucket,
ObjInfo: objInfo,
ReqParams: extractReqParams(r),
})
}
// Download - file download handler.
func (web *webAPIHandlers) Download(w http.ResponseWriter, r *http.Request) {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
writeWebErrorResponse(w, errServerNotInitialized)
return
}
vars := mux.Vars(r)
bucket := vars["bucket"]
object := vars["object"]
token := r.URL.Query().Get("token")
if !isAuthTokenValid(token) && !isBucketActionAllowed("s3:GetObject", bucket, object) {
writeWebErrorResponse(w, errAuthentication)
return
}
// Add content disposition.
w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", path.Base(object)))
// Lock the object before reading.
objectLock := globalNSMutex.NewNSLock(bucket, object)
objectLock.RLock()
defer objectLock.RUnlock()
if err := objectAPI.GetObject(bucket, object, 0, -1, w); err != nil {
/// No need to print error, response writer already written to.
return
}
}
// DownloadZipArgs - Argument for downloading a bunch of files as a zip file.
// JSON will look like:
// '{"bucketname":"testbucket","prefix":"john/pics/","objects":["hawaii/","maldives/","sanjose.jpg"]}'
type DownloadZipArgs struct {
Objects []string `json:"objects"` // can be files or sub-directories
Prefix string `json:"prefix"` // current directory in the browser-ui
BucketName string `json:"bucketname"` // bucket name.
}
// Takes a list of objects and creates a zip file that sent as the response body.
func (web *webAPIHandlers) DownloadZip(w http.ResponseWriter, r *http.Request) {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
writeWebErrorResponse(w, errServerNotInitialized)
return
}
// Auth is done after reading the body to accommodate for anonymous requests
// when bucket policy is enabled.
var args DownloadZipArgs
tenKB := 10 * 1024 // To limit r.Body to take care of misbehaving anonymous client.
decodeErr := json.NewDecoder(io.LimitReader(r.Body, int64(tenKB))).Decode(&args)
if decodeErr != nil {
writeWebErrorResponse(w, decodeErr)
return
}
token := r.URL.Query().Get("token")
if !isAuthTokenValid(token) {
for _, object := range args.Objects {
if !isBucketActionAllowed("s3:GetObject", args.BucketName, pathJoin(args.Prefix, object)) {
writeWebErrorResponse(w, errAuthentication)
return
}
}
}
archive := zip.NewWriter(w)
defer archive.Close()
for _, object := range args.Objects {
// Writes compressed object file to the response.
zipit := func(objectName string) error {
info, err := objectAPI.GetObjectInfo(args.BucketName, objectName)
if err != nil {
return err
}
header := &zip.FileHeader{
Name: strings.TrimPrefix(objectName, args.Prefix),
Method: zip.Deflate,
UncompressedSize64: uint64(info.Size),
UncompressedSize: uint32(info.Size),
}
writer, err := archive.CreateHeader(header)
if err != nil {
writeWebErrorResponse(w, errUnexpected)
return err
}
return objectAPI.GetObject(args.BucketName, objectName, 0, info.Size, writer)
}
if !hasSuffix(object, slashSeparator) {
// If not a directory, compress the file and write it to response.
err := zipit(pathJoin(args.Prefix, object))
if err != nil {
return
}
continue
}
// For directories, list the contents recursively and write the objects as compressed
// date to the response writer.
marker := ""
for {
lo, err := objectAPI.ListObjects(args.BucketName, pathJoin(args.Prefix, object), marker, "", 1000)
if err != nil {
return
}
marker = lo.NextMarker
for _, obj := range lo.Objects {
err = zipit(obj.Name)
if err != nil {
return
}
}
if !lo.IsTruncated {
break
}
}
}
}
// GetBucketPolicyArgs - get bucket policy args.
type GetBucketPolicyArgs struct {
BucketName string `json:"bucketName"`
Prefix string `json:"prefix"`
}
// GetBucketPolicyRep - get bucket policy reply.
type GetBucketPolicyRep struct {
UIVersion string `json:"uiVersion"`
Policy policy.BucketPolicy `json:"policy"`
}
func readBucketAccessPolicy(objAPI ObjectLayer, bucketName string) (policy.BucketAccessPolicy, error) {
bucketPolicyReader, err := readBucketPolicyJSON(bucketName, objAPI)
if err != nil {
if _, ok := err.(BucketPolicyNotFound); ok {
return policy.BucketAccessPolicy{Version: "2012-10-17"}, nil
}
return policy.BucketAccessPolicy{}, err
}
bucketPolicyBuf, err := ioutil.ReadAll(bucketPolicyReader)
if err != nil {
return policy.BucketAccessPolicy{}, err
}
policyInfo := policy.BucketAccessPolicy{}
err = json.Unmarshal(bucketPolicyBuf, &policyInfo)
if err != nil {
return policy.BucketAccessPolicy{}, err
}
return policyInfo, nil
}
// GetBucketPolicy - get bucket policy.
func (web *webAPIHandlers) GetBucketPolicy(r *http.Request, args *GetBucketPolicyArgs, reply *GetBucketPolicyRep) error {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
policyInfo, err := readBucketAccessPolicy(objectAPI, args.BucketName)
if err != nil {
return toJSONError(err, args.BucketName)
}
reply.UIVersion = browser.UIVersion
reply.Policy = policy.GetPolicy(policyInfo.Statements, args.BucketName, args.Prefix)
return nil
}
// ListAllBucketPoliciesArgs - get all bucket policies.
type ListAllBucketPoliciesArgs struct {
BucketName string `json:"bucketName"`
}
// BucketAccessPolicy - Collection of canned bucket policy at a given prefix.
type BucketAccessPolicy struct {
Prefix string `json:"prefix"`
Policy policy.BucketPolicy `json:"policy"`
}
// ListAllBucketPoliciesRep - get all bucket policy reply.
type ListAllBucketPoliciesRep struct {
UIVersion string `json:"uiVersion"`
Policies []BucketAccessPolicy `json:"policies"`
}
// GetllBucketPolicy - get all bucket policy.
func (web *webAPIHandlers) ListAllBucketPolicies(r *http.Request, args *ListAllBucketPoliciesArgs, reply *ListAllBucketPoliciesRep) error {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
policyInfo, err := readBucketAccessPolicy(objectAPI, args.BucketName)
if err != nil {
return toJSONError(err, args.BucketName)
}
reply.UIVersion = browser.UIVersion
for prefix, policy := range policy.GetPolicies(policyInfo.Statements, args.BucketName) {
reply.Policies = append(reply.Policies, BucketAccessPolicy{
Prefix: prefix,
Policy: policy,
})
}
return nil
}
// SetBucketPolicyArgs - set bucket policy args.
type SetBucketPolicyArgs struct {
BucketName string `json:"bucketName"`
Prefix string `json:"prefix"`
Policy string `json:"policy"`
}
// SetBucketPolicy - set bucket policy.
func (web *webAPIHandlers) SetBucketPolicy(r *http.Request, args *SetBucketPolicyArgs, reply *WebGenericRep) error {
objectAPI := web.ObjectAPI()
if objectAPI == nil {
return toJSONError(errServerNotInitialized)
}
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
bucketP := policy.BucketPolicy(args.Policy)
if !bucketP.IsValidBucketPolicy() {
return &json2.Error{
Message: "Invalid policy type " + args.Policy,
}
}
policyInfo, err := readBucketAccessPolicy(objectAPI, args.BucketName)
if err != nil {
return toJSONError(err, args.BucketName)
}
policyInfo.Statements = policy.SetPolicy(policyInfo.Statements, bucketP, args.BucketName, args.Prefix)
if len(policyInfo.Statements) == 0 {
err = persistAndNotifyBucketPolicyChange(args.BucketName, policyChange{true, nil}, objectAPI)
if err != nil {
return toJSONError(err, args.BucketName)
}
reply.UIVersion = browser.UIVersion
return nil
}
data, err := json.Marshal(policyInfo)
if err != nil {
return toJSONError(err)
}
// Parse validate and save bucket policy.
if s3Error := parseAndPersistBucketPolicy(args.BucketName, data, objectAPI); s3Error != ErrNone {
apiErr := getAPIError(s3Error)
var err error
if apiErr.Code == "XMinioPolicyNesting" {
err = PolicyNesting{}
} else {
err = errors.New(apiErr.Description)
}
return toJSONError(err, args.BucketName)
}
reply.UIVersion = browser.UIVersion
return nil
}
// PresignedGetArgs - presigned-get API args.
type PresignedGetArgs struct {
// Host header required for signed headers.
HostName string `json:"host"`
// Bucket name of the object to be presigned.
BucketName string `json:"bucket"`
// Object name to be presigned.
ObjectName string `json:"object"`
// Expiry in seconds.
Expiry int64 `json:"expiry"`
}
// PresignedGetRep - presigned-get URL reply.
type PresignedGetRep struct {
UIVersion string `json:"uiVersion"`
// Presigned URL of the object.
URL string `json:"url"`
}
// PresignedGET - returns presigned-Get url.
func (web *webAPIHandlers) PresignedGet(r *http.Request, args *PresignedGetArgs, reply *PresignedGetRep) error {
if !isHTTPRequestValid(r) {
return toJSONError(errAuthentication)
}
if args.BucketName == "" || args.ObjectName == "" {
return &json2.Error{
Message: "Bucket and Object are mandatory arguments.",
}
}
reply.UIVersion = browser.UIVersion
reply.URL = presignedGet(args.HostName, args.BucketName, args.ObjectName, args.Expiry)
return nil
}
// Returns presigned url for GET method.
func presignedGet(host, bucket, object string, expiry int64) string {
cred := serverConfig.GetCredential()
region := serverConfig.GetRegion()
accessKey := cred.AccessKey
secretKey := cred.SecretKey
date := UTCNow()
dateStr := date.Format(iso8601Format)
credential := fmt.Sprintf("%s/%s", accessKey, getScope(date, region))
var expiryStr = "604800" // Default set to be expire in 7days.
if expiry < 604800 && expiry > 0 {
expiryStr = strconv.FormatInt(expiry, 10)
}
query := strings.Join([]string{
"X-Amz-Algorithm=" + signV4Algorithm,
"X-Amz-Credential=" + strings.Replace(credential, "/", "%2F", -1),
"X-Amz-Date=" + dateStr,
"X-Amz-Expires=" + expiryStr,
"X-Amz-SignedHeaders=host",
}, "&")
path := "/" + path.Join(bucket, object)
// "host" is the only header required to be signed for Presigned URLs.
extractedSignedHeaders := make(http.Header)
extractedSignedHeaders.Set("host", host)
canonicalRequest := getCanonicalRequest(extractedSignedHeaders, unsignedPayload, query, path, "GET")
stringToSign := getStringToSign(canonicalRequest, date, getScope(date, region))
signingKey := getSigningKey(secretKey, date, region)
signature := getSignature(signingKey, stringToSign)
// Construct the final presigned URL.
return host + path + "?" + query + "&" + "X-Amz-Signature=" + signature
}
// toJSONError converts regular errors into more user friendly
// and consumable error message for the browser UI.
func toJSONError(err error, params ...string) (jerr *json2.Error) {
apiErr := toWebAPIError(err)
jerr = &json2.Error{
Message: apiErr.Description,
}
switch apiErr.Code {
// Reserved bucket name provided.
case "AllAccessDisabled":
if len(params) > 0 {
jerr = &json2.Error{
Message: fmt.Sprintf("All access to this bucket %s has been disabled.", params[0]),
}
}
// Bucket name invalid with custom error message.
case "InvalidBucketName":
if len(params) > 0 {
jerr = &json2.Error{
Message: fmt.Sprintf("Bucket Name %s is invalid. Lowercase letters, period, hyphen, numerals are the only allowed characters and should be minimum 3 characters in length.", params[0]),
}
}
// Bucket not found custom error message.
case "NoSuchBucket":
if len(params) > 0 {
jerr = &json2.Error{
Message: fmt.Sprintf("The specified bucket %s does not exist.", params[0]),
}
}
// Object not found custom error message.
case "NoSuchKey":
if len(params) > 1 {
jerr = &json2.Error{
Message: fmt.Sprintf("The specified key %s does not exist", params[1]),
}
}
// Add more custom error messages here with more context.
}
return jerr
}
// toWebAPIError - convert into error into APIError.
func toWebAPIError(err error) APIError {
err = errorCause(err)
if err == errAuthentication {
return APIError{
Code: "AccessDenied",
HTTPStatusCode: http.StatusForbidden,
Description: err.Error(),
}
} else if err == errServerNotInitialized {
return APIError{
Code: "XMinioServerNotInitialized",
HTTPStatusCode: http.StatusServiceUnavailable,
Description: err.Error(),
}
} else if err == errInvalidAccessKeyLength {
return APIError{
Code: "AccessDenied",
HTTPStatusCode: http.StatusForbidden,
Description: err.Error(),
}
} else if err == errInvalidSecretKeyLength {
return APIError{
Code: "AccessDenied",
HTTPStatusCode: http.StatusForbidden,
Description: err.Error(),
}
} else if err == errInvalidAccessKeyID {
return APIError{
Code: "AccessDenied",
HTTPStatusCode: http.StatusForbidden,
Description: err.Error(),
}
} else if err == errSizeUnspecified {
return APIError{
Code: "InvalidRequest",
HTTPStatusCode: http.StatusBadRequest,
Description: err.Error(),
}
} else if err == errChangeCredNotAllowed {
return APIError{
Code: "MethodNotAllowed",
HTTPStatusCode: http.StatusMethodNotAllowed,
Description: err.Error(),
}
} else if err == errReservedBucket {
return APIError{
Code: "AllAccessDisabled",
HTTPStatusCode: http.StatusForbidden,
Description: err.Error(),
}
} else if err == errInvalidArgument {
return APIError{
Code: "InvalidArgument",
HTTPStatusCode: http.StatusBadRequest,
Description: err.Error(),
}
}
// Convert error type to api error code.
var apiErrCode APIErrorCode
switch err.(type) {
case StorageFull:
apiErrCode = ErrStorageFull
case BucketNotFound:
apiErrCode = ErrNoSuchBucket
case BucketExists:
apiErrCode = ErrBucketAlreadyOwnedByYou
case BucketNameInvalid:
apiErrCode = ErrInvalidBucketName
case BadDigest:
apiErrCode = ErrBadDigest
case IncompleteBody:
apiErrCode = ErrIncompleteBody
case ObjectExistsAsDirectory:
apiErrCode = ErrObjectExistsAsDirectory
case ObjectNotFound:
apiErrCode = ErrNoSuchKey
case ObjectNameInvalid:
apiErrCode = ErrNoSuchKey
case InsufficientWriteQuorum:
apiErrCode = ErrWriteQuorum
case InsufficientReadQuorum:
apiErrCode = ErrReadQuorum
case PolicyNesting:
apiErrCode = ErrPolicyNesting
default:
// Log unexpected and unhandled errors.
errorIf(err, errUnexpected.Error())
apiErrCode = ErrInternalError
}
apiErr := getAPIError(apiErrCode)
return apiErr
}
// writeWebErrorResponse - set HTTP status code and write error description to the body.
func writeWebErrorResponse(w http.ResponseWriter, err error) {
apiErr := toWebAPIError(err)
w.WriteHeader(apiErr.HTTPStatusCode)
w.Write([]byte(apiErr.Description))
}