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// Copyright 2020 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package lfs
import (
"net/http"
"strings"
"gopkg.in/macaron.v1"
log "unknwon.dev/clog/v2"
"gogs.io/gogs/internal/auth"
"gogs.io/gogs/internal/authutil"
"gogs.io/gogs/internal/conf"
"gogs.io/gogs/internal/db"
"gogs.io/gogs/internal/lfsutil"
)
// RegisterRoutes registers LFS routes using given router, and inherits all groups and middleware.
func RegisterRoutes(r *macaron.Router) {
verifyAccept := verifyHeader("Accept", contentType, http.StatusNotAcceptable)
verifyContentTypeJSON := verifyHeader("Content-Type", contentType, http.StatusBadRequest)
verifyContentTypeStream := verifyHeader("Content-Type", "application/octet-stream", http.StatusBadRequest)
r.Group("", func() {
r.Post("/objects/batch", authorize(db.AccessModeRead), verifyAccept, verifyContentTypeJSON, serveBatch)
r.Group("/objects/basic", func() {
basic := &basicHandler{
defaultStorage: lfsutil.Storage(conf.LFS.Storage),
storagers: map[lfsutil.Storage]lfsutil.Storager{
lfsutil.StorageLocal: &lfsutil.LocalStorage{Root: conf.LFS.ObjectsPath},
},
}
r.Combo("/:oid", verifyOID()).
Get(authorize(db.AccessModeRead), basic.serveDownload).
Put(authorize(db.AccessModeWrite), verifyContentTypeStream, basic.serveUpload)
r.Post("/verify", authorize(db.AccessModeWrite), verifyAccept, verifyContentTypeJSON, basic.serveVerify)
})
}, authenticate())
}
// authenticate tries to authenticate user via HTTP Basic Auth. It first tries to authenticate
// as plain username and password, then use username as access token if previous step failed.
func authenticate() macaron.Handler {
askCredentials := func(w http.ResponseWriter) {
w.Header().Set("Lfs-Authenticate", `Basic realm="Git LFS"`)
responseJSON(w, http.StatusUnauthorized, responseError{
Message: "Credentials needed",
})
}
return func(c *macaron.Context) {
username, password := authutil.DecodeBasic(c.Req.Header)
if username == "" {
askCredentials(c.Resp)
return
}
user, err := db.Users.Authenticate(c.Req.Context(), username, password, -1)
if err != nil && !auth.IsErrBadCredentials(err) {
internalServerError(c.Resp)
log.Error("Failed to authenticate user [name: %s]: %v", username, err)
return
}
if err == nil && user.IsEnabledTwoFactor() {
c.Error(http.StatusBadRequest, "Users with 2FA enabled are not allowed to authenticate via username and password.")
return
}
// If username and password authentication failed, try again using username as an access token.
if auth.IsErrBadCredentials(err) {
token, err := db.AccessTokens.GetBySHA1(c.Req.Context(), username)
if err != nil {
if db.IsErrAccessTokenNotExist(err) {
askCredentials(c.Resp)
} else {
internalServerError(c.Resp)
log.Error("Failed to get access token [sha: %s]: %v", username, err)
}
return
}
if err = db.AccessTokens.Touch(c.Req.Context(), token.ID); err != nil {
log.Error("Failed to touch access token: %v", err)
}
user, err = db.Users.GetByID(c.Req.Context(), token.UserID)
if err != nil {
// Once we found the token, we're supposed to find its related user,
// thus any error is unexpected.
internalServerError(c.Resp)
log.Error("Failed to get user [id: %d]: %v", token.UserID, err)
return
}
}
log.Trace("[LFS] Authenticated user: %s", user.Name)
c.Map(user)
}
}
// authorize tries to authorize the user to the context repository with given access mode.
func authorize(mode db.AccessMode) macaron.Handler {
return func(c *macaron.Context, actor *db.User) {
username := c.Params(":username")
reponame := strings.TrimSuffix(c.Params(":reponame"), ".git")
owner, err := db.Users.GetByUsername(c.Req.Context(), username)
if err != nil {
if db.IsErrUserNotExist(err) {
c.Status(http.StatusNotFound)
} else {
internalServerError(c.Resp)
log.Error("Failed to get user [name: %s]: %v", username, err)
}
return
}
repo, err := db.Repos.GetByName(owner.ID, reponame)
if err != nil {
if db.IsErrRepoNotExist(err) {
c.Status(http.StatusNotFound)
} else {
internalServerError(c.Resp)
log.Error("Failed to get repository [owner_id: %d, name: %s]: %v", owner.ID, reponame, err)
}
return
}
if !db.Perms.Authorize(c.Req.Context(), actor.ID, repo.ID, mode,
db.AccessModeOptions{
OwnerID: repo.OwnerID,
Private: repo.IsPrivate,
},
) {
c.Status(http.StatusNotFound)
return
}
log.Trace("[LFS] Authorized user %q to %q", actor.Name, username+"/"+reponame)
c.Map(owner) // NOTE: Override actor
c.Map(repo)
}
}
// verifyHeader checks if the HTTP header contains given value.
// When not, response given "failCode" as status code.
func verifyHeader(key, value string, failCode int) macaron.Handler {
return func(c *macaron.Context) {
vals := c.Req.Header.Values(key)
for _, val := range vals {
if strings.Contains(val, value) {
return
}
}
log.Trace("[LFS] HTTP header %q does not contain value %q", key, value)
c.Status(failCode)
}
}
// verifyOID checks if the ":oid" URL parameter is valid.
func verifyOID() macaron.Handler {
return func(c *macaron.Context) {
oid := lfsutil.OID(c.Params(":oid"))
if !lfsutil.ValidOID(oid) {
responseJSON(c.Resp, http.StatusBadRequest, responseError{
Message: "Invalid oid",
})
return
}
c.Map(oid)
}
}
func internalServerError(w http.ResponseWriter) {
responseJSON(w, http.StatusInternalServerError, responseError{
Message: "Internal server error",
})
}
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