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Test if LFS object is accessible #16865

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merged 3 commits into from
Aug 31, 2021
Merged

Test if LFS object is accessible #16865

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365e3c0
Test if object is accessible.
KN4CK3R Aug 29, 2021
6a6ce8a
Added more logging.
KN4CK3R Aug 29, 2021
7a25a41
Merge branch 'main' into fix-lfs-upload
6543 Aug 31, 2021
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20 changes: 15 additions & 5 deletions integrations/api_repo_lfs_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -253,6 +253,10 @@ func TestAPILFSBatch(t *testing.T) {
assert.NoError(t, err)
assert.True(t, exist)

repo2 := createLFSTestRepository(t, "batch2")
content := []byte("dummy0")
storeObjectInRepo(t, repo2.ID, &content)

meta, err := repo.GetLFSMetaObjectByOid(p.Oid)
assert.Nil(t, meta)
assert.Equal(t, models.ErrLFSObjectNotExist, err)
Expand Down Expand Up @@ -358,13 +362,19 @@ func TestAPILFSUpload(t *testing.T) {
assert.Nil(t, meta)
assert.Equal(t, models.ErrLFSObjectNotExist, err)

req := newRequest(t, p, "")
t.Run("InvalidAccess", func(t *testing.T) {
req := newRequest(t, p, "invalid")
session.MakeRequest(t, req, http.StatusUnprocessableEntity)
})

session.MakeRequest(t, req, http.StatusOK)
t.Run("ValidAccess", func(t *testing.T) {
req := newRequest(t, p, "dummy5")

meta, err = repo.GetLFSMetaObjectByOid(p.Oid)
assert.NoError(t, err)
assert.NotNil(t, meta)
session.MakeRequest(t, req, http.StatusOK)
meta, err = repo.GetLFSMetaObjectByOid(p.Oid)
assert.NoError(t, err)
assert.NotNil(t, meta)
})
})

t.Run("MetaAlreadyExists", func(t *testing.T) {
Expand Down
59 changes: 45 additions & 14 deletions services/lfs/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,9 @@
package lfs

import (
"crypto/sha256"
"encoding/base64"
"encoding/hex"
"errors"
"fmt"
"io"
Expand Down Expand Up @@ -214,14 +216,22 @@ func BatchHandler(ctx *context.Context) {
}
}

if exists {
if meta == nil {
if exists && meta == nil {
accessible, err := models.LFSObjectAccessible(ctx.User, p.Oid)
if err != nil {
log.Error("Unable to check if LFS MetaObject [%s] is accessible. Error: %v", p.Oid, err)
writeStatus(ctx, http.StatusInternalServerError)
return
}
if accessible {
_, err := models.NewLFSMetaObject(&models.LFSMetaObject{Pointer: p, RepositoryID: repository.ID})
if err != nil {
log.Error("Unable to create LFS MetaObject [%s] for %s/%s. Error: %v", p.Oid, rc.User, rc.Repo, err)
writeStatus(ctx, http.StatusInternalServerError)
return
}
} else {
exists = false
}
}

Expand Down Expand Up @@ -271,29 +281,50 @@ func UploadHandler(ctx *context.Context) {
return
}

meta, err := models.NewLFSMetaObject(&models.LFSMetaObject{Pointer: p, RepositoryID: repository.ID})
if err != nil {
log.Error("Unable to create LFS MetaObject [%s] for %s/%s. Error: %v", p.Oid, rc.User, rc.Repo, err)
writeStatus(ctx, http.StatusInternalServerError)
return
}

contentStore := lfs_module.NewContentStore()

exists, err := contentStore.Exists(p)
if err != nil {
log.Error("Unable to check if LFS OID[%s] exist. Error: %v", p.Oid, err)
writeStatus(ctx, http.StatusInternalServerError)
return
}
if meta.Existing || exists {
ctx.Resp.WriteHeader(http.StatusOK)
return

uploadOrVerify := func() error {
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I think it would be better to just unfold this.

Although it would require some slight duplication of error messages we'd be able to work out from the error where the problem occurred much more easily.

if exists {
accessible, err := models.LFSObjectAccessible(ctx.User, p.Oid)
if err != nil {
log.Error("Unable to check if LFS MetaObject [%s] is accessible. Error: %v", p.Oid, err)
return err
}
if !accessible {
// The file exists but the user has no access to it.
// The upload gets verified by hashing and size comparison to prove access to it.
hash := sha256.New()
written, err := io.Copy(hash, ctx.Req.Body)
if err != nil {
log.Error("Error creating hash. Error: %v", err)
return err
}

if written != p.Size {
return lfs_module.ErrSizeMismatch
}
if hex.EncodeToString(hash.Sum(nil)) != p.Oid {
return lfs_module.ErrHashMismatch
}
}
} else if err := contentStore.Put(p, ctx.Req.Body); err != nil {
log.Error("Error putting LFS MetaObject [%s] into content store. Error: %v", p.Oid, err)
return err
}
_, err := models.NewLFSMetaObject(&models.LFSMetaObject{Pointer: p, RepositoryID: repository.ID})
return err
}

defer ctx.Req.Body.Close()
if err := contentStore.Put(meta.Pointer, ctx.Req.Body); err != nil {
if err := uploadOrVerify(); err != nil {
if errors.Is(err, lfs_module.ErrSizeMismatch) || errors.Is(err, lfs_module.ErrHashMismatch) {
log.Error("Upload does not match LFS MetaObject [%s]. Error: %v", p.Oid, err)
writeStatusMessage(ctx, http.StatusUnprocessableEntity, err.Error())
} else {
writeStatus(ctx, http.StatusInternalServerError)
Expand Down