mirror of
https://github.com/go-gitea/gitea
synced 2024-11-18 07:52:03 +01:00
110fc57cbc
* Move access and repo permission to models/perm/access * fix test * Move some git related files into sub package models/git * Fix build * fix git test * move lfs to sub package * move more git related functions to models/git * Move functions sequence * Some improvements per @KN4CK3R and @delvh
570 lines
17 KiB
Go
570 lines
17 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package lfs
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import (
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"path"
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"regexp"
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"strconv"
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"strings"
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git_model "code.gitea.io/gitea/models/git"
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"code.gitea.io/gitea/models/perm"
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access_model "code.gitea.io/gitea/models/perm/access"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/models/unit"
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user_model "code.gitea.io/gitea/models/user"
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"code.gitea.io/gitea/modules/context"
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"code.gitea.io/gitea/modules/json"
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lfs_module "code.gitea.io/gitea/modules/lfs"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/storage"
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"github.com/golang-jwt/jwt/v4"
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)
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// requestContext contain variables from the HTTP request.
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type requestContext struct {
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User string
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Repo string
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Authorization string
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}
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// Claims is a JWT Token Claims
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type Claims struct {
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RepoID int64
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Op string
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UserID int64
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jwt.RegisteredClaims
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}
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// DownloadLink builds a URL to download the object.
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func (rc *requestContext) DownloadLink(p lfs_module.Pointer) string {
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return setting.AppURL + path.Join(url.PathEscape(rc.User), url.PathEscape(rc.Repo+".git"), "info/lfs/objects", url.PathEscape(p.Oid))
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}
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// UploadLink builds a URL to upload the object.
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func (rc *requestContext) UploadLink(p lfs_module.Pointer) string {
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return setting.AppURL + path.Join(url.PathEscape(rc.User), url.PathEscape(rc.Repo+".git"), "info/lfs/objects", url.PathEscape(p.Oid), strconv.FormatInt(p.Size, 10))
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}
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// VerifyLink builds a URL for verifying the object.
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func (rc *requestContext) VerifyLink(p lfs_module.Pointer) string {
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return setting.AppURL + path.Join(url.PathEscape(rc.User), url.PathEscape(rc.Repo+".git"), "info/lfs/verify")
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}
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// CheckAcceptMediaType checks if the client accepts the LFS media type.
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func CheckAcceptMediaType(ctx *context.Context) {
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mediaParts := strings.Split(ctx.Req.Header.Get("Accept"), ";")
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if mediaParts[0] != lfs_module.MediaType {
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log.Trace("Calling a LFS method without accepting the correct media type: %s", lfs_module.MediaType)
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writeStatus(ctx, http.StatusUnsupportedMediaType)
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return
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}
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}
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// DownloadHandler gets the content from the content store
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func DownloadHandler(ctx *context.Context) {
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rc := getRequestContext(ctx)
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p := lfs_module.Pointer{Oid: ctx.Params("oid")}
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meta := getAuthenticatedMeta(ctx, rc, p, false)
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if meta == nil {
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return
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}
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// Support resume download using Range header
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var fromByte, toByte int64
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toByte = meta.Size - 1
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statusCode := http.StatusOK
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if rangeHdr := ctx.Req.Header.Get("Range"); rangeHdr != "" {
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regex := regexp.MustCompile(`bytes=(\d+)\-(\d*).*`)
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match := regex.FindStringSubmatch(rangeHdr)
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if len(match) > 1 {
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statusCode = http.StatusPartialContent
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fromByte, _ = strconv.ParseInt(match[1], 10, 32)
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if fromByte >= meta.Size {
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writeStatus(ctx, http.StatusRequestedRangeNotSatisfiable)
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return
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}
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if match[2] != "" {
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_toByte, _ := strconv.ParseInt(match[2], 10, 32)
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if _toByte >= fromByte && _toByte < toByte {
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toByte = _toByte
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}
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}
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ctx.Resp.Header().Set("Content-Range", fmt.Sprintf("bytes %d-%d/%d", fromByte, toByte, meta.Size-fromByte))
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Range")
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}
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}
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contentStore := lfs_module.NewContentStore()
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content, err := contentStore.Get(meta.Pointer)
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if err != nil {
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writeStatus(ctx, http.StatusNotFound)
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return
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}
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defer content.Close()
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if fromByte > 0 {
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_, err = content.Seek(fromByte, io.SeekStart)
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if err != nil {
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log.Error("Whilst trying to read LFS OID[%s]: Unable to seek to %d Error: %v", meta.Oid, fromByte, err)
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writeStatus(ctx, http.StatusInternalServerError)
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return
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}
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}
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contentLength := toByte + 1 - fromByte
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ctx.Resp.Header().Set("Content-Length", strconv.FormatInt(contentLength, 10))
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ctx.Resp.Header().Set("Content-Type", "application/octet-stream")
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filename := ctx.Params("filename")
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if len(filename) > 0 {
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decodedFilename, err := base64.RawURLEncoding.DecodeString(filename)
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if err == nil {
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ctx.Resp.Header().Set("Content-Disposition", "attachment; filename=\""+string(decodedFilename)+"\"")
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ctx.Resp.Header().Set("Access-Control-Expose-Headers", "Content-Disposition")
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}
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}
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ctx.Resp.WriteHeader(statusCode)
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if written, err := io.CopyN(ctx.Resp, content, contentLength); err != nil {
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log.Error("Error whilst copying LFS OID[%s] to the response after %d bytes. Error: %v", meta.Oid, written, err)
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}
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}
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// BatchHandler provides the batch api
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func BatchHandler(ctx *context.Context) {
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var br lfs_module.BatchRequest
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if err := decodeJSON(ctx.Req, &br); err != nil {
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log.Trace("Unable to decode BATCH request vars: Error: %v", err)
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writeStatus(ctx, http.StatusBadRequest)
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return
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}
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var isUpload bool
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if br.Operation == "upload" {
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isUpload = true
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} else if br.Operation == "download" {
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isUpload = false
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} else {
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log.Trace("Attempt to BATCH with invalid operation: %s", br.Operation)
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writeStatus(ctx, http.StatusBadRequest)
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return
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}
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rc := getRequestContext(ctx)
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repository := getAuthenticatedRepository(ctx, rc, isUpload)
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if repository == nil {
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return
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}
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contentStore := lfs_module.NewContentStore()
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var responseObjects []*lfs_module.ObjectResponse
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for _, p := range br.Objects {
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if !p.IsValid() {
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responseObjects = append(responseObjects, buildObjectResponse(rc, p, false, false, &lfs_module.ObjectError{
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Code: http.StatusUnprocessableEntity,
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Message: "Oid or size are invalid",
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}))
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continue
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}
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exists, err := contentStore.Exists(p)
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if err != nil {
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log.Error("Unable to check if LFS OID[%s] exist. Error: %v", p.Oid, rc.User, rc.Repo, err)
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writeStatus(ctx, http.StatusInternalServerError)
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return
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}
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meta, err := git_model.GetLFSMetaObjectByOid(repository.ID, p.Oid)
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if err != nil && err != git_model.ErrLFSObjectNotExist {
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log.Error("Unable to get LFS MetaObject [%s] for %s/%s. Error: %v", p.Oid, rc.User, rc.Repo, err)
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writeStatus(ctx, http.StatusInternalServerError)
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return
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}
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if meta != nil && p.Size != meta.Size {
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responseObjects = append(responseObjects, buildObjectResponse(rc, p, false, false, &lfs_module.ObjectError{
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Code: http.StatusUnprocessableEntity,
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Message: fmt.Sprintf("Object %s is not %d bytes", p.Oid, p.Size),
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}))
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continue
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}
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var responseObject *lfs_module.ObjectResponse
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if isUpload {
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var err *lfs_module.ObjectError
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if !exists && setting.LFS.MaxFileSize > 0 && p.Size > setting.LFS.MaxFileSize {
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err = &lfs_module.ObjectError{
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Code: http.StatusUnprocessableEntity,
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Message: fmt.Sprintf("Size must be less than or equal to %d", setting.LFS.MaxFileSize),
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}
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}
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if exists && meta == nil {
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accessible, err := git_model.LFSObjectAccessible(ctx.Doer, p.Oid)
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if err != nil {
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log.Error("Unable to check if LFS MetaObject [%s] is accessible. Error: %v", p.Oid, err)
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writeStatus(ctx, http.StatusInternalServerError)
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return
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}
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if accessible {
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_, err := git_model.NewLFSMetaObject(&git_model.LFSMetaObject{Pointer: p, RepositoryID: repository.ID})
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if err != nil {
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log.Error("Unable to create LFS MetaObject [%s] for %s/%s. Error: %v", p.Oid, rc.User, rc.Repo, err)
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writeStatus(ctx, http.StatusInternalServerError)
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return
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}
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} else {
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exists = false
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}
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}
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responseObject = buildObjectResponse(rc, p, false, !exists, err)
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} else {
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var err *lfs_module.ObjectError
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if !exists || meta == nil {
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err = &lfs_module.ObjectError{
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Code: http.StatusNotFound,
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Message: http.StatusText(http.StatusNotFound),
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}
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}
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responseObject = buildObjectResponse(rc, p, true, false, err)
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}
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responseObjects = append(responseObjects, responseObject)
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}
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respobj := &lfs_module.BatchResponse{Objects: responseObjects}
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ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
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enc := json.NewEncoder(ctx.Resp)
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if err := enc.Encode(respobj); err != nil {
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log.Error("Failed to encode representation as json. Error: %v", err)
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}
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}
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// UploadHandler receives data from the client and puts it into the content store
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func UploadHandler(ctx *context.Context) {
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rc := getRequestContext(ctx)
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p := lfs_module.Pointer{Oid: ctx.Params("oid")}
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var err error
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if p.Size, err = strconv.ParseInt(ctx.Params("size"), 10, 64); err != nil {
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writeStatusMessage(ctx, http.StatusUnprocessableEntity, err.Error())
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}
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if !p.IsValid() {
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log.Trace("Attempt to access invalid LFS OID[%s] in %s/%s", p.Oid, rc.User, rc.Repo)
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writeStatus(ctx, http.StatusUnprocessableEntity)
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return
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}
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repository := getAuthenticatedRepository(ctx, rc, true)
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if repository == nil {
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return
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}
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contentStore := lfs_module.NewContentStore()
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exists, err := contentStore.Exists(p)
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if err != nil {
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log.Error("Unable to check if LFS OID[%s] exist. Error: %v", p.Oid, err)
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writeStatus(ctx, http.StatusInternalServerError)
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return
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}
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uploadOrVerify := func() error {
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if exists {
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accessible, err := git_model.LFSObjectAccessible(ctx.Doer, p.Oid)
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if err != nil {
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log.Error("Unable to check if LFS MetaObject [%s] is accessible. Error: %v", p.Oid, err)
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return err
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}
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if !accessible {
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// The file exists but the user has no access to it.
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// The upload gets verified by hashing and size comparison to prove access to it.
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hash := sha256.New()
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written, err := io.Copy(hash, ctx.Req.Body)
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if err != nil {
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log.Error("Error creating hash. Error: %v", err)
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return err
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}
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if written != p.Size {
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return lfs_module.ErrSizeMismatch
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}
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if hex.EncodeToString(hash.Sum(nil)) != p.Oid {
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return lfs_module.ErrHashMismatch
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}
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}
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} else if err := contentStore.Put(p, ctx.Req.Body); err != nil {
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log.Error("Error putting LFS MetaObject [%s] into content store. Error: %v", p.Oid, err)
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return err
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}
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_, err := git_model.NewLFSMetaObject(&git_model.LFSMetaObject{Pointer: p, RepositoryID: repository.ID})
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return err
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}
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defer ctx.Req.Body.Close()
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if err := uploadOrVerify(); err != nil {
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if errors.Is(err, lfs_module.ErrSizeMismatch) || errors.Is(err, lfs_module.ErrHashMismatch) {
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log.Error("Upload does not match LFS MetaObject [%s]. Error: %v", p.Oid, err)
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writeStatusMessage(ctx, http.StatusUnprocessableEntity, err.Error())
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} else {
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writeStatus(ctx, http.StatusInternalServerError)
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}
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if _, err = git_model.RemoveLFSMetaObjectByOid(repository.ID, p.Oid); err != nil {
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log.Error("Error whilst removing metaobject for LFS OID[%s]: %v", p.Oid, err)
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}
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return
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}
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writeStatus(ctx, http.StatusOK)
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}
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// VerifyHandler verify oid and its size from the content store
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func VerifyHandler(ctx *context.Context) {
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var p lfs_module.Pointer
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if err := decodeJSON(ctx.Req, &p); err != nil {
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writeStatus(ctx, http.StatusUnprocessableEntity)
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return
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}
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rc := getRequestContext(ctx)
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meta := getAuthenticatedMeta(ctx, rc, p, true)
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if meta == nil {
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return
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}
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contentStore := lfs_module.NewContentStore()
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ok, err := contentStore.Verify(meta.Pointer)
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status := http.StatusOK
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if err != nil {
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status = http.StatusInternalServerError
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} else if !ok {
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status = http.StatusNotFound
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}
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writeStatus(ctx, status)
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}
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func decodeJSON(req *http.Request, v interface{}) error {
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defer req.Body.Close()
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dec := json.NewDecoder(req.Body)
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return dec.Decode(v)
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}
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func getRequestContext(ctx *context.Context) *requestContext {
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return &requestContext{
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User: ctx.Params("username"),
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Repo: strings.TrimSuffix(ctx.Params("reponame"), ".git"),
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Authorization: ctx.Req.Header.Get("Authorization"),
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}
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}
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func getAuthenticatedMeta(ctx *context.Context, rc *requestContext, p lfs_module.Pointer, requireWrite bool) *git_model.LFSMetaObject {
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if !p.IsValid() {
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log.Info("Attempt to access invalid LFS OID[%s] in %s/%s", p.Oid, rc.User, rc.Repo)
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writeStatusMessage(ctx, http.StatusUnprocessableEntity, "Oid or size are invalid")
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return nil
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}
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repository := getAuthenticatedRepository(ctx, rc, requireWrite)
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if repository == nil {
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return nil
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}
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meta, err := git_model.GetLFSMetaObjectByOid(repository.ID, p.Oid)
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if err != nil {
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log.Error("Unable to get LFS OID[%s] Error: %v", p.Oid, err)
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writeStatus(ctx, http.StatusNotFound)
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return nil
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}
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return meta
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}
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func getAuthenticatedRepository(ctx *context.Context, rc *requestContext, requireWrite bool) *repo_model.Repository {
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repository, err := repo_model.GetRepositoryByOwnerAndName(rc.User, rc.Repo)
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if err != nil {
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log.Error("Unable to get repository: %s/%s Error: %v", rc.User, rc.Repo, err)
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writeStatus(ctx, http.StatusNotFound)
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return nil
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}
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if !authenticate(ctx, repository, rc.Authorization, false, requireWrite) {
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requireAuth(ctx)
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return nil
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}
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return repository
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}
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func buildObjectResponse(rc *requestContext, pointer lfs_module.Pointer, download, upload bool, err *lfs_module.ObjectError) *lfs_module.ObjectResponse {
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rep := &lfs_module.ObjectResponse{Pointer: pointer}
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if err != nil {
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rep.Error = err
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} else {
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rep.Actions = make(map[string]*lfs_module.Link)
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header := make(map[string]string)
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if len(rc.Authorization) > 0 {
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header["Authorization"] = rc.Authorization
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}
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if download {
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rep.Actions["download"] = &lfs_module.Link{Href: rc.DownloadLink(pointer), Header: header}
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if setting.LFS.ServeDirect {
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// If we have a signed url (S3, object storage), redirect to this directly.
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u, err := storage.LFS.URL(pointer.RelativePath(), pointer.Oid)
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if u != nil && err == nil {
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rep.Actions["download"] = &lfs_module.Link{Href: u.String(), Header: header}
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}
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}
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}
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if upload {
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rep.Actions["upload"] = &lfs_module.Link{Href: rc.UploadLink(pointer), Header: header}
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verifyHeader := make(map[string]string)
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for key, value := range header {
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verifyHeader[key] = value
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}
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// This is only needed to workaround https://github.com/git-lfs/git-lfs/issues/3662
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verifyHeader["Accept"] = lfs_module.MediaType
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rep.Actions["verify"] = &lfs_module.Link{Href: rc.VerifyLink(pointer), Header: verifyHeader}
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}
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}
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return rep
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}
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func writeStatus(ctx *context.Context, status int) {
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writeStatusMessage(ctx, status, http.StatusText(status))
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}
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func writeStatusMessage(ctx *context.Context, status int, message string) {
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ctx.Resp.Header().Set("Content-Type", lfs_module.MediaType)
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ctx.Resp.WriteHeader(status)
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er := lfs_module.ErrorResponse{Message: message}
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enc := json.NewEncoder(ctx.Resp)
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if err := enc.Encode(er); err != nil {
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log.Error("Failed to encode error response as json. Error: %v", err)
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}
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}
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// authenticate uses the authorization string to determine whether
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// or not to proceed. This server assumes an HTTP Basic auth format.
|
|
func authenticate(ctx *context.Context, repository *repo_model.Repository, authorization string, requireSigned, requireWrite bool) bool {
|
|
accessMode := perm.AccessModeRead
|
|
if requireWrite {
|
|
accessMode = perm.AccessModeWrite
|
|
}
|
|
|
|
// ctx.IsSigned is unnecessary here, this will be checked in perm.CanAccess
|
|
perm, err := access_model.GetUserRepoPermission(ctx, repository, ctx.Doer)
|
|
if err != nil {
|
|
log.Error("Unable to GetUserRepoPermission for user %-v in repo %-v Error: %v", ctx.Doer, repository)
|
|
return false
|
|
}
|
|
|
|
canRead := perm.CanAccess(accessMode, unit.TypeCode)
|
|
if canRead && (!requireSigned || ctx.IsSigned) {
|
|
return true
|
|
}
|
|
|
|
user, err := parseToken(authorization, repository, accessMode)
|
|
if err != nil {
|
|
// Most of these are Warn level - the true internal server errors are logged in parseToken already
|
|
log.Warn("Authentication failure for provided token with Error: %v", err)
|
|
return false
|
|
}
|
|
ctx.Doer = user
|
|
return true
|
|
}
|
|
|
|
func handleLFSToken(tokenSHA string, target *repo_model.Repository, mode perm.AccessMode) (*user_model.User, error) {
|
|
if !strings.Contains(tokenSHA, ".") {
|
|
return nil, nil
|
|
}
|
|
token, err := jwt.ParseWithClaims(tokenSHA, &Claims{}, func(t *jwt.Token) (interface{}, error) {
|
|
if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
|
|
return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
|
|
}
|
|
return setting.LFS.JWTSecretBytes, nil
|
|
})
|
|
if err != nil {
|
|
return nil, nil
|
|
}
|
|
|
|
claims, claimsOk := token.Claims.(*Claims)
|
|
if !token.Valid || !claimsOk {
|
|
return nil, fmt.Errorf("invalid token claim")
|
|
}
|
|
|
|
if claims.RepoID != target.ID {
|
|
return nil, fmt.Errorf("invalid token claim")
|
|
}
|
|
|
|
if mode == perm.AccessModeWrite && claims.Op != "upload" {
|
|
return nil, fmt.Errorf("invalid token claim")
|
|
}
|
|
|
|
u, err := user_model.GetUserByID(claims.UserID)
|
|
if err != nil {
|
|
log.Error("Unable to GetUserById[%d]: Error: %v", claims.UserID, err)
|
|
return nil, err
|
|
}
|
|
return u, nil
|
|
}
|
|
|
|
func parseToken(authorization string, target *repo_model.Repository, mode perm.AccessMode) (*user_model.User, error) {
|
|
if authorization == "" {
|
|
return nil, fmt.Errorf("no token")
|
|
}
|
|
|
|
parts := strings.SplitN(authorization, " ", 2)
|
|
if len(parts) != 2 {
|
|
return nil, fmt.Errorf("no token")
|
|
}
|
|
tokenSHA := parts[1]
|
|
switch strings.ToLower(parts[0]) {
|
|
case "bearer":
|
|
fallthrough
|
|
case "token":
|
|
return handleLFSToken(tokenSHA, target, mode)
|
|
}
|
|
return nil, fmt.Errorf("token not found")
|
|
}
|
|
|
|
func requireAuth(ctx *context.Context) {
|
|
ctx.Resp.Header().Set("WWW-Authenticate", "Basic realm=gitea-lfs")
|
|
writeStatus(ctx, http.StatusUnauthorized)
|
|
}
|