Refactor the codebase
This commit is contained in:
parent
5d64be33e6
commit
15e4d10fd4
13 changed files with 775 additions and 551 deletions
1
.gitignore
vendored
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1
.gitignore
vendored
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@ -0,0 +1 @@
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bagage
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28
auth_basic.go
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28
auth_basic.go
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package main
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import (
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"errors"
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"net/http"
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)
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/*
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* We extract the credentials from the Basic Auth headers
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* (We may think to other ways to pass credentials such as a JWT)
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*/
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type BasicAuthExtract struct {
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OnNotFound ErrorHandler
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OnCreds CredsHandler
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}
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func (b BasicAuthExtract) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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username, password, ok := r.BasicAuth()
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if !ok {
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b.OnNotFound.WithError(errors.New("LDAP. Missing Authentication Header")).ServeHTTP(w, r)
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return
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}
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if username == "" || password == "" {
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b.OnNotFound.WithError(errors.New("LDAP. Username or password cannot be empty")).ServeHTTP(w, r)
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return
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}
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b.OnCreds.WithCreds(username, password).ServeHTTP(w, r)
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}
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115
auth_ldap.go
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115
auth_ldap.go
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@ -0,0 +1,115 @@
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package main
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import (
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"errors"
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"fmt"
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"net/http"
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"github.com/go-ldap/ldap/v3"
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)
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/* Check credentials against LDAP */
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type LdapPreAuth struct {
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WithConfig *Config
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OnWrongPassword ErrorHandler
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OnFailure ErrorHandler
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OnCreds CredsHandler
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}
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func (l LdapPreAuth) WithCreds(username, password string) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// 1. Connect to the server
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conn, err := ldapConnect(l.WithConfig)
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if err != nil {
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l.OnFailure.WithError(err).ServeHTTP(w, r)
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return
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}
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defer conn.Close()
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// 2. Authenticate with provided credentials
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// @FIXME we should better check the error, it could also be due to an LDAP error
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err = conn.auth(username, password)
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if err != nil {
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l.OnWrongPassword.WithError(err).ServeHTTP(w, r)
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return
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}
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// 3. Fetch user's profile
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profile, err := conn.profile()
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if err != nil {
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l.OnFailure.WithError(err).ServeHTTP(w, r)
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return
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}
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// 4. Basic checks upon users' attributes
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access_key := profile.GetAttributeValue("garage_s3_access_key")
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secret_key := profile.GetAttributeValue("garage_s3_secret_key")
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if access_key == "" || secret_key == "" {
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err = errors.New(fmt.Sprintf("Either access key or secret key is missing in LDAP for %s", conn.userDn))
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l.OnFailure.WithError(err).ServeHTTP(w, r)
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return
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}
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// 5. Send fetched credentials to the next middleware
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l.OnCreds.WithCreds(access_key, secret_key).ServeHTTP(w, r)
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})
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}
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/**
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* Private logic
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*/
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type ldapConnector struct {
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conn *ldap.Conn
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config *Config
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userDn string
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}
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func ldapConnect(c *Config) (ldapConnector, error) {
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ldapSock, err := ldap.Dial("tcp", c.LdapServer)
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if err != nil {
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return ldapConnector{}, err
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}
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return ldapConnector{
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conn: ldapSock,
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config: c,
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}, nil
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}
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func (l *ldapConnector) auth(username, password string) error {
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l.userDn = fmt.Sprintf("%s=%s,%s", l.config.UserNameAttr, username, l.config.UserBaseDN)
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return l.conn.Bind(l.userDn, password)
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}
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func (l *ldapConnector) profile() (*ldap.Entry, error) {
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searchRequest := ldap.NewSearchRequest(
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l.userDn,
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ldap.ScopeBaseObject,
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ldap.NeverDerefAliases,
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0,
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0,
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false,
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"(objectClass=*)",
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[]string{"garage_s3_access_key", "garage_s3_secret_key"},
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nil)
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sr, err := l.conn.Search(searchRequest)
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if err != nil {
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return nil, err
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}
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if len(sr.Entries) != 1 {
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return nil, errors.New(fmt.Sprintf("Wrong number of LDAP entries, expected 1, got", len(sr.Entries)))
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}
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return sr.Entries[0], nil
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}
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func (l *ldapConnector) Close() {
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if l.conn != nil {
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l.conn.Close()
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l.conn = nil
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}
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}
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29
auth_s3.go
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29
auth_s3.go
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package main
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import (
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"net/http"
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"github.com/minio/minio-go/v7"
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"github.com/minio/minio-go/v7/pkg/credentials"
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)
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/* Check credentials against Minio */
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type S3Auth struct {
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WithConfig *Config
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OnMinioClient MinioClientHandler
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OnFailure ErrorHandler
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}
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func (s S3Auth) WithCreds(access_key, secret_key string) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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mc, err := minio.New(s.WithConfig.Endpoint, &minio.Options{
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Creds: credentials.NewStaticV4(access_key, secret_key, ""),
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Secure: s.WithConfig.UseSSL,
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})
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if err != nil {
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s.OnFailure.WithError(err).ServeHTTP(w, r)
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return
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}
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s.OnMinioClient.WithMC(mc).ServeHTTP(w, r)
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})
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}
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77
config.go
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77
config.go
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package main
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import (
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"fmt"
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"os"
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"reflect"
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)
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type Config struct {
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HttpListen string `env:"BAGAGE_HTTP_LISTEN" default:":8080"`
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DavPath string `env:"BAGAGE_WEBDAV_PREFIX" default:"/webdav"`
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LdapServer string `env:"BAGAGE_LDAP_ENDPOINT" default:"127.0.0.1:1389"`
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UserBaseDN string `env:"BAGAGE_LDAP_USER_BASE_DN" default:"ou=users,dc=deuxfleurs,dc=fr"`
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UserNameAttr string `env:"BAGAGE_LDAP_USERNAME_ATTR" default:"cn"`
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Endpoint string `env:"BAGAGE_S3_ENDPOINT" default:"garage.deuxfleurs.fr"`
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UseSSL bool `env:"BAGAGE_S3_SSL" default:"true"`
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}
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func (c *Config) LoadWithDefault() *Config {
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c.iter(func(t reflect.StructField, v reflect.Value) {
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tag := t.Tag.Get("default")
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if tag == "" {
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return
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} else {
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setKey(v, tag)
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}
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})
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return c
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}
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func (c *Config) LoadWithEnv() *Config {
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c.iter(func(t reflect.StructField, v reflect.Value) {
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tag := t.Tag.Get("env")
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if tag == "" {
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return
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} else if val, ok := os.LookupEnv(tag); ok {
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setKey(v, val)
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}
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})
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return c
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}
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func (c *Config) String() (rep string) {
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rep = "Configuration:\n"
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c.iter(func(t reflect.StructField, v reflect.Value) {
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rep += "\t" + t.Name + ": "
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if t.Type.Kind() == reflect.Bool {
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rep += fmt.Sprintf("%v", v.Bool()) + "\n"
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} else {
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rep += "\"" + v.String() + "\"\n"
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}
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})
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return
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}
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func (c *Config) iter(cb func(t reflect.StructField, v reflect.Value)) {
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t := reflect.ValueOf(c).Elem()
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for i := 0; i < t.Type().NumField(); i++ {
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field := t.Field(i)
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typeField := t.Type().Field(i)
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cb(typeField, field)
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}
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}
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func setKey(v reflect.Value, e string) {
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if v.Type().Kind() == reflect.String {
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v.SetString(e)
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} else if v.Type().Kind() == reflect.Bool {
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v.SetBool(e == "true")
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} else {
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panic("Unsupported type")
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}
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}
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24
error.go
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24
error.go
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package main
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import (
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"net/http"
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)
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type NotAuthorized struct{}
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func (n NotAuthorized) WithError(err error) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("WWW-Authenticate", `Basic realm="Pour accéder à Bagage, veuillez entrer vos identifiants Deuxfleurs"`)
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w.WriteHeader(401)
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w.Write([]byte("401 Unauthorized\n"))
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})
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}
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type InternalError struct{}
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func (i InternalError) WithError(err error) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(500)
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w.Write([]byte("500 Internal Server Error\n"))
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})
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}
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570
main.go
570
main.go
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package main
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"io/fs"
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"log"
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"mime"
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"net/http"
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"os"
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"path"
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"strings"
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"time"
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"golang.org/x/net/webdav"
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"github.com/go-ldap/ldap/v3"
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"github.com/minio/minio-go/v7"
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"github.com/minio/minio-go/v7/pkg/credentials"
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)
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type bagageCtxKey string
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const garageEntry = bagageCtxKey("garage")
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type garageCtx struct {
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MC *minio.Client
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StatCache map[string]*GarageStat
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}
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func EnvOrDefault(key, def string) string {
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if val, ok := os.LookupEnv(key); ok {
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return val
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}
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return def
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}
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func main() {
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log.Println("=== Starting Bagage ===")
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HttpListen := EnvOrDefault("BAGAGE_HTTP_LISTEN", ":8080")
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pathPrefix := EnvOrDefault("BAGAGE_WEBDAV_PREFIX", "/webdav")
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LdapServer := EnvOrDefault("BAGAGE_LDAP_ENDPOINT", "127.0.0.1:1389")
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UserBaseDN := EnvOrDefault("BAGAGE_LDAP_USER_BASE_DN", "ou=users,dc=deuxfleurs,dc=fr")
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UserNameAttr := EnvOrDefault("BAGAGE_LDAP_USERNAME_ATTR", "cn")
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Endpoint := EnvOrDefault("BAGAGE_S3_ENDPOINT", "garage.deuxfleurs.fr")
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UseSSL := EnvOrDefault("BAGAGE_S3_SSL", "true") == "true"
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config := (&Config{}).LoadWithDefault().LoadWithEnv()
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srv := &webdav.Handler{
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Prefix: pathPrefix,
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FileSystem: NewGarageFS(),
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LockSystem: webdav.NewMemLS(),
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Logger: func(r *http.Request, err error) {
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log.Printf("INFO: %s %s %s\n", r.RemoteAddr, r.Method, r.URL)
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if err != nil {
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log.Printf("ERR: %v", err)
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}
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},
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}
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log.Println(config)
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http.HandleFunc(pathPrefix+"/", func(w http.ResponseWriter, r *http.Request) {
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username, password, ok := r.BasicAuth()
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if !ok {
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NotAuthorized(w, r)
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return
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}
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ldapSock, err := ldap.Dial("tcp", LdapServer)
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if err != nil {
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log.Println(err)
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InternalError(w, r)
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return
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}
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defer ldapSock.Close()
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// Check credential
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userDn := fmt.Sprintf("%s=%s,%s", UserNameAttr, username, UserBaseDN)
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err = ldapSock.Bind(userDn, password)
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if err != nil {
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log.Println(err)
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NotAuthorized(w, r)
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return
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}
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// Get S3 creds garage_s3_access_key garage_s3_secret_key
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searchRequest := ldap.NewSearchRequest(
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userDn,
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ldap.ScopeBaseObject,
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ldap.NeverDerefAliases,
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0,
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0,
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false,
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"(objectClass=*)",
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[]string{"garage_s3_access_key", "garage_s3_secret_key"},
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nil)
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sr, err := ldapSock.Search(searchRequest)
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if err != nil {
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log.Println(err)
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InternalError(w, r)
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return
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}
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if len(sr.Entries) != 1 {
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log.Println("Wrong number of LDAP entries, expected 1, got", len(sr.Entries))
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InternalError(w, r)
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return
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}
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access_key := sr.Entries[0].GetAttributeValue("garage_s3_access_key")
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secret_key := sr.Entries[0].GetAttributeValue("garage_s3_secret_key")
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if access_key == "" || secret_key == "" {
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log.Println("Either access key or secret key is missing in LDAP for ", userDn)
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InternalError(w, r)
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return
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}
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mc, err := minio.New(Endpoint, &minio.Options{
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Creds: credentials.NewStaticV4(access_key, secret_key, ""),
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Secure: UseSSL,
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// Assemble components to handle WebDAV requests
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http.Handle(config.DavPath+"/",
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BasicAuthExtract{
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OnNotFound: NotAuthorized{},
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OnCreds: LdapPreAuth{
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WithConfig: config,
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OnWrongPassword: NotAuthorized{},
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OnFailure: InternalError{},
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OnCreds: S3Auth{
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WithConfig: config,
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OnFailure: InternalError{},
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OnMinioClient: WebDav{
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WithConfig: config,
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},
|
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},
|
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},
|
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})
|
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if err != nil {
|
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log.Println(err)
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InternalError(w, r)
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return
|
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}
|
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|
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nctx := context.WithValue(r.Context(), garageEntry, garageCtx{MC: mc, StatCache: make(map[string]*GarageStat)})
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srv.ServeHTTP(w, r.WithContext(nctx))
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return
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})
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if err := http.ListenAndServe(HttpListen, nil); err != nil {
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if err := http.ListenAndServe(config.HttpListen, nil); err != nil {
|
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log.Fatalf("Error with WebDAV server: %v", err)
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}
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}
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func NotAuthorized(w http.ResponseWriter, r *http.Request) {
|
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w.Header().Set("WWW-Authenticate", `Basic realm="Pour accéder à Bagage, veuillez entrer vos identifiants Deuxfleurs"`)
|
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w.WriteHeader(401)
|
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w.Write([]byte("401 Unauthorized\n"))
|
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}
|
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|
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func InternalError(w http.ResponseWriter, r *http.Request) {
|
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w.WriteHeader(500)
|
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w.Write([]byte("500 Internal Server Error\n"))
|
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}
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/*
|
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/////// Select Action
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If no slash or one trailing slash
|
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return ListBuckets
|
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Else
|
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obj := ListObjects
|
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If obj.Length == 1
|
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return GetObject
|
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Else
|
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return obj
|
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*/
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type GarageFS struct{}
|
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|
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func NewGarageFS() *GarageFS {
|
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grg := new(GarageFS)
|
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return grg
|
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}
|
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|
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func (s *GarageFS) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
|
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return errors.New("Not implemented Mkdir")
|
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}
|
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|
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func (s *GarageFS) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
|
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//log.Println("Stat from GarageFS.OpenFile()", name)
|
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NewGarageStatFromFile(ctx, name)
|
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return NewGarageFile(ctx, name)
|
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}
|
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|
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func (s *GarageFS) RemoveAll(ctx context.Context, name string) error {
|
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return errors.New("Not implemented RemoveAll")
|
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}
|
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|
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func (s *GarageFS) Rename(ctx context.Context, oldName, newName string) error {
|
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return errors.New("Not implemented Rename")
|
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}
|
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|
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func (s *GarageFS) Stat(ctx context.Context, name string) (os.FileInfo, error) {
|
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//log.Println("Stat from GarageFS.Stat()", name)
|
||||
return NewGarageStat(ctx, name)
|
||||
}
|
||||
|
||||
type GarageFile struct {
|
||||
ctx context.Context
|
||||
mc *minio.Client
|
||||
obj *minio.Object
|
||||
objw *io.PipeWriter
|
||||
donew chan error
|
||||
pos int64
|
||||
path S3Path
|
||||
}
|
||||
|
||||
func NewGarageFile(ctx context.Context, path string) (webdav.File, error) {
|
||||
gf := new(GarageFile)
|
||||
gf.ctx = ctx
|
||||
gf.pos = 0
|
||||
gf.mc = ctx.Value(garageEntry).(garageCtx).MC
|
||||
gf.path = NewS3Path(path)
|
||||
return gf, nil
|
||||
}
|
||||
|
||||
func (gf *GarageFile) Close() error {
|
||||
err := make([]error, 0)
|
||||
|
||||
if gf.obj != nil {
|
||||
err = append(err, gf.obj.Close())
|
||||
gf.obj = nil
|
||||
}
|
||||
|
||||
if gf.objw != nil {
|
||||
// wait that minio completes its transfers in background
|
||||
err = append(err, gf.objw.Close())
|
||||
err = append(err, <-gf.donew)
|
||||
gf.donew = nil
|
||||
gf.objw = nil
|
||||
}
|
||||
|
||||
count := 0
|
||||
for _, e := range err {
|
||||
if e != nil {
|
||||
count++
|
||||
log.Println(e)
|
||||
}
|
||||
}
|
||||
if count > 0 {
|
||||
return errors.New(fmt.Sprintf("%d errors when closing this WebDAV File. Read previous logs to know more.", count))
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (gf *GarageFile) loadObject() error {
|
||||
if gf.obj == nil {
|
||||
obj, err := gf.mc.GetObject(gf.ctx, gf.path.bucket, gf.path.key, minio.GetObjectOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
gf.obj = obj
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (gf *GarageFile) Read(p []byte) (n int, err error) {
|
||||
//if gf.Stat() & OBJECT == 0 { /* @FIXME Ideally we would check against OBJECT but we need a non OPAQUE_KEY */
|
||||
// return 0, os.ErrInvalid
|
||||
//}
|
||||
if err := gf.loadObject(); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
return gf.obj.Read(p)
|
||||
}
|
||||
|
||||
func (gf *GarageFile) Write(p []byte) (n int, err error) {
|
||||
/*if gf.path.class != OBJECT {
|
||||
return 0, os.ErrInvalid
|
||||
}*/
|
||||
|
||||
if gf.objw == nil {
|
||||
if gf.pos != 0 {
|
||||
return 0, errors.New("writing with an offset is not implemented")
|
||||
}
|
||||
|
||||
r, w := io.Pipe()
|
||||
gf.donew = make(chan error, 1)
|
||||
gf.objw = w
|
||||
|
||||
contentType := mime.TypeByExtension(path.Ext(gf.path.key))
|
||||
go func() {
|
||||
_, err := gf.mc.PutObject(context.Background(), gf.path.bucket, gf.path.key, r, -1, minio.PutObjectOptions{ContentType: contentType})
|
||||
gf.donew <- err
|
||||
}()
|
||||
}
|
||||
|
||||
return gf.objw.Write(p)
|
||||
}
|
||||
|
||||
func (gf *GarageFile) Seek(offset int64, whence int) (int64, error) {
|
||||
if err := gf.loadObject(); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
pos, err := gf.obj.Seek(offset, whence)
|
||||
gf.pos += pos
|
||||
return pos, err
|
||||
}
|
||||
|
||||
/*
|
||||
ReadDir reads the contents of the directory associated with the file f and returns a slice of DirEntry values in directory order. Subsequent calls on the same file will yield later DirEntry records in the directory.
|
||||
|
||||
If n > 0, ReadDir returns at most n DirEntry records. In this case, if ReadDir returns an empty slice, it will return an error explaining why. At the end of a directory, the error is io.EOF.
|
||||
|
||||
If n <= 0, ReadDir returns all the DirEntry records remaining in the directory. When it succeeds, it returns a nil error (not io.EOF).
|
||||
*/
|
||||
func (gf *GarageFile) Readdir(count int) ([]fs.FileInfo, error) {
|
||||
if count > 0 {
|
||||
return nil, errors.New("returning a limited number of directory entry is not supported in readdir")
|
||||
}
|
||||
|
||||
if gf.path.class == ROOT {
|
||||
return gf.readDirRoot(count)
|
||||
} else {
|
||||
return gf.readDirChild(count)
|
||||
}
|
||||
}
|
||||
|
||||
func (gf *GarageFile) readDirRoot(count int) ([]fs.FileInfo, error) {
|
||||
buckets, err := gf.mc.ListBuckets(gf.ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
entries := make([]fs.FileInfo, 0, len(buckets))
|
||||
for _, bucket := range buckets {
|
||||
//log.Println("Stat from GarageFile.readDirRoot()", "/"+bucket.Name)
|
||||
ngf, err := NewGarageStat(gf.ctx, "/"+bucket.Name)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
entries = append(entries, ngf)
|
||||
}
|
||||
|
||||
return entries, nil
|
||||
}
|
||||
|
||||
func (gf *GarageFile) readDirChild(count int) ([]fs.FileInfo, error) {
|
||||
prefix := gf.path.key
|
||||
if len(prefix) > 0 && prefix[len(prefix)-1:] != "/" {
|
||||
prefix = prefix + "/"
|
||||
}
|
||||
|
||||
objs_info := gf.mc.ListObjects(gf.ctx, gf.path.bucket, minio.ListObjectsOptions{
|
||||
Prefix: prefix,
|
||||
Recursive: false,
|
||||
})
|
||||
|
||||
entries := make([]fs.FileInfo, 0)
|
||||
for object := range objs_info {
|
||||
if object.Err != nil {
|
||||
return nil, object.Err
|
||||
}
|
||||
//log.Println("Stat from GarageFile.readDirChild()", path.Join("/", gf.path.bucket, object.Key))
|
||||
ngf, err := NewGarageStatFromObjectInfo(gf.ctx, gf.path.bucket, object)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
entries = append(entries, ngf)
|
||||
}
|
||||
|
||||
return entries, nil
|
||||
}
|
||||
|
||||
func (gf *GarageFile) Stat() (fs.FileInfo, error) {
|
||||
//log.Println("Stat from GarageFile.Stat()", gf.path.path)
|
||||
return NewGarageStatFromFile(gf.ctx, gf.path.path)
|
||||
}
|
||||
|
||||
/* Implements */
|
||||
// StatObject???
|
||||
type GarageStat struct {
|
||||
obj minio.ObjectInfo
|
||||
ctx context.Context
|
||||
path S3Path
|
||||
}
|
||||
|
||||
/*
|
||||
* Stat a path
|
||||
*/
|
||||
func NewGarageStatFromFile(ctx context.Context, path string) (*GarageStat, error) {
|
||||
cache := ctx.Value(garageEntry).(garageCtx).StatCache
|
||||
|
||||
// Maybe this file is already in our cache?
|
||||
if entry, ok := cache[path]; ok {
|
||||
return entry, nil
|
||||
}
|
||||
|
||||
// Create a placeholder in case we are creating the object
|
||||
gs := new(GarageStat)
|
||||
gs.ctx = ctx
|
||||
gs.path = NewS3Path(path)
|
||||
if gs.path.class == OPAQUE_KEY {
|
||||
gs.path.class = OBJECT // known because called from GarageFile
|
||||
}
|
||||
gs.obj.Key = gs.path.key
|
||||
gs.obj.LastModified = time.Now()
|
||||
|
||||
// Maybe this file exists in garage?
|
||||
err := gs.Refresh()
|
||||
if err != nil && !os.IsNotExist(err) {
|
||||
// There is an error and this is not a 404, report it.
|
||||
return nil, err
|
||||
}
|
||||
|
||||
cache[path] = gs
|
||||
return gs, nil
|
||||
}
|
||||
|
||||
/*
|
||||
* Stat a path knowing its ObjectInfo
|
||||
*/
|
||||
func NewGarageStatFromObjectInfo(ctx context.Context, bucket string, obj minio.ObjectInfo) (*GarageStat, error) {
|
||||
gs := new(GarageStat)
|
||||
gs.path = NewTrustedS3Path(bucket, obj)
|
||||
gs.obj = obj
|
||||
|
||||
cache := ctx.Value(garageEntry).(garageCtx).StatCache
|
||||
cache[gs.path.path] = gs
|
||||
return gs, nil
|
||||
}
|
||||
|
||||
/*
|
||||
* Stat a path without additional information
|
||||
*/
|
||||
func NewGarageStat(ctx context.Context, path string) (*GarageStat, error) {
|
||||
cache := ctx.Value(garageEntry).(garageCtx).StatCache
|
||||
if entry, ok := cache[path]; ok {
|
||||
return entry, nil
|
||||
}
|
||||
|
||||
gs := new(GarageStat)
|
||||
gs.ctx = ctx
|
||||
gs.path = NewS3Path(path)
|
||||
if err := gs.Refresh(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if gs.path.class&OPAQUE_KEY != 0 {
|
||||
return nil, errors.New("Failed to precisely determine the key type, this a logic error.")
|
||||
}
|
||||
|
||||
cache[path] = gs
|
||||
cache[gs.path.path] = gs
|
||||
return gs, nil
|
||||
}
|
||||
|
||||
func (gs *GarageStat) Refresh() error {
|
||||
if gs.path.class == ROOT || gs.path.class == BUCKET {
|
||||
return nil
|
||||
}
|
||||
|
||||
mc := gs.ctx.Value(garageEntry).(garageCtx).MC
|
||||
|
||||
// Compute the prefix to have the desired behaviour for our stat logic
|
||||
prefix := gs.path.key
|
||||
if prefix[len(prefix)-1:] == "/" {
|
||||
prefix = prefix[:len(prefix)-1]
|
||||
}
|
||||
|
||||
// Get info and check if the key exists
|
||||
objs_info := mc.ListObjects(gs.ctx, gs.path.bucket, minio.ListObjectsOptions{
|
||||
Prefix: prefix,
|
||||
Recursive: false,
|
||||
})
|
||||
|
||||
found := false
|
||||
for object := range objs_info {
|
||||
if object.Err != nil {
|
||||
return object.Err
|
||||
}
|
||||
|
||||
if object.Key == prefix || object.Key == prefix+"/" {
|
||||
gs.obj = object
|
||||
gs.path = NewTrustedS3Path(gs.path.bucket, object)
|
||||
found = true
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
if !found {
|
||||
return fs.ErrNotExist
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (gs *GarageStat) Name() string {
|
||||
if gs.path.class == ROOT {
|
||||
return "/"
|
||||
} else if gs.path.class == BUCKET {
|
||||
return gs.path.bucket
|
||||
} else {
|
||||
return path.Base(gs.path.key)
|
||||
}
|
||||
}
|
||||
|
||||
func (gs *GarageStat) Size() int64 {
|
||||
return gs.obj.Size
|
||||
}
|
||||
|
||||
func (gs *GarageStat) Mode() fs.FileMode {
|
||||
if gs.path.class == OBJECT {
|
||||
return fs.ModePerm
|
||||
} else {
|
||||
return fs.ModeDir | fs.ModePerm
|
||||
}
|
||||
}
|
||||
|
||||
func (gs *GarageStat) ModTime() time.Time {
|
||||
return gs.obj.LastModified
|
||||
}
|
||||
|
||||
func (gs *GarageStat) IsDir() bool {
|
||||
return gs.path.class != OBJECT
|
||||
}
|
||||
|
||||
func (gs *GarageStat) Sys() interface{} {
|
||||
return nil
|
||||
}
|
||||
|
||||
type S3Class int
|
||||
|
||||
const (
|
||||
ROOT S3Class = 1 << iota
|
||||
BUCKET
|
||||
COMMON_PREFIX
|
||||
OBJECT
|
||||
OPAQUE_KEY
|
||||
|
||||
KEY = COMMON_PREFIX | OBJECT | OPAQUE_KEY
|
||||
)
|
||||
|
||||
type S3Path struct {
|
||||
path string
|
||||
class S3Class
|
||||
bucket string
|
||||
key string
|
||||
}
|
||||
|
||||
func NewS3Path(path string) S3Path {
|
||||
exploded_path := strings.SplitN(path, "/", 3)
|
||||
|
||||
// If there is no bucket name (eg. "/")
|
||||
if len(exploded_path) < 2 || exploded_path[1] == "" {
|
||||
return S3Path{path, ROOT, "", ""}
|
||||
}
|
||||
|
||||
// If there is no key
|
||||
if len(exploded_path) < 3 || exploded_path[2] == "" {
|
||||
return S3Path{path, BUCKET, exploded_path[1], ""}
|
||||
}
|
||||
|
||||
return S3Path{path, OPAQUE_KEY, exploded_path[1], exploded_path[2]}
|
||||
}
|
||||
|
||||
func NewTrustedS3Path(bucket string, obj minio.ObjectInfo) S3Path {
|
||||
cl := OBJECT
|
||||
if obj.Key[len(obj.Key)-1:] == "/" {
|
||||
cl = COMMON_PREFIX
|
||||
}
|
||||
|
||||
return S3Path{
|
||||
path: path.Join("/", bucket, obj.Key),
|
||||
bucket: bucket,
|
||||
key: obj.Key,
|
||||
class: cl,
|
||||
}
|
||||
}
|
||||
|
|
|
|||
17
middleware.go
Normal file
17
middleware.go
Normal file
|
|
@ -0,0 +1,17 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"github.com/minio/minio-go/v7"
|
||||
"net/http"
|
||||
)
|
||||
|
||||
/* We define some interface to enable our middleware to communicate */
|
||||
type ErrorHandler interface {
|
||||
WithError(err error) http.Handler
|
||||
}
|
||||
type CredsHandler interface {
|
||||
WithCreds(username, password string) http.Handler
|
||||
}
|
||||
type MinioClientHandler interface {
|
||||
WithMC(mc *minio.Client) http.Handler
|
||||
}
|
||||
186
s3_file.go
Normal file
186
s3_file.go
Normal file
|
|
@ -0,0 +1,186 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"io/fs"
|
||||
"log"
|
||||
"mime"
|
||||
"path"
|
||||
|
||||
"github.com/minio/minio-go/v7"
|
||||
"golang.org/x/net/webdav"
|
||||
)
|
||||
|
||||
type S3File struct {
|
||||
fs *S3FS
|
||||
obj *minio.Object
|
||||
objw *io.PipeWriter
|
||||
donew chan error
|
||||
pos int64
|
||||
path S3Path
|
||||
}
|
||||
|
||||
func NewS3File(s *S3FS, path string) (webdav.File, error) {
|
||||
f := new(S3File)
|
||||
f.fs = s
|
||||
f.pos = 0
|
||||
f.path = NewS3Path(path)
|
||||
return f, nil
|
||||
}
|
||||
|
||||
func (f *S3File) Close() error {
|
||||
err := make([]error, 0)
|
||||
|
||||
if f.obj != nil {
|
||||
err = append(err, f.obj.Close())
|
||||
f.obj = nil
|
||||
}
|
||||
|
||||
if f.objw != nil {
|
||||
// wait that minio completes its transfers in background
|
||||
err = append(err, f.objw.Close())
|
||||
err = append(err, <-f.donew)
|
||||
f.donew = nil
|
||||
f.objw = nil
|
||||
}
|
||||
|
||||
count := 0
|
||||
for _, e := range err {
|
||||
if e != nil {
|
||||
count++
|
||||
log.Println(e)
|
||||
}
|
||||
}
|
||||
if count > 0 {
|
||||
return errors.New(fmt.Sprintf("%d errors when closing this WebDAV File. Read previous logs to know more.", count))
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (f *S3File) loadObject() error {
|
||||
if f.obj == nil {
|
||||
obj, err := f.fs.mc.GetObject(f.fs.ctx, f.path.bucket, f.path.key, minio.GetObjectOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
f.obj = obj
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (f *S3File) Read(p []byte) (n int, err error) {
|
||||
//if f.Stat() & OBJECT == 0 { /* @FIXME Ideally we would check against OBJECT but we need a non OPAQUE_KEY */
|
||||
// return 0, os.ErrInvalid
|
||||
//}
|
||||
if err := f.loadObject(); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
return f.obj.Read(p)
|
||||
}
|
||||
|
||||
func (f *S3File) Write(p []byte) (n int, err error) {
|
||||
/*if f.path.class != OBJECT {
|
||||
return 0, os.ErrInvalid
|
||||
}*/
|
||||
|
||||
if f.objw == nil {
|
||||
if f.pos != 0 {
|
||||
return 0, errors.New("writing with an offset is not implemented")
|
||||
}
|
||||
|
||||
r, w := io.Pipe()
|
||||
f.donew = make(chan error, 1)
|
||||
f.objw = w
|
||||
|
||||
contentType := mime.TypeByExtension(path.Ext(f.path.key))
|
||||
go func() {
|
||||
_, err := f.fs.mc.PutObject(context.Background(), f.path.bucket, f.path.key, r, -1, minio.PutObjectOptions{ContentType: contentType})
|
||||
f.donew <- err
|
||||
}()
|
||||
}
|
||||
|
||||
return f.objw.Write(p)
|
||||
}
|
||||
|
||||
func (f *S3File) Seek(offset int64, whence int) (int64, error) {
|
||||
if err := f.loadObject(); err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
pos, err := f.obj.Seek(offset, whence)
|
||||
f.pos += pos
|
||||
return pos, err
|
||||
}
|
||||
|
||||
/*
|
||||
ReadDir reads the contents of the directory associated with the file f and returns a slice of DirEntry values in directory order. Subsequent calls on the same file will yield later DirEntry records in the directory.
|
||||
|
||||
If n > 0, ReadDir returns at most n DirEntry records. In this case, if ReadDir returns an empty slice, it will return an error explaining why. At the end of a directory, the error is io.EOF.
|
||||
|
||||
If n <= 0, ReadDir returns all the DirEntry records remaining in the directory. When it succeeds, it returns a nil error (not io.EOF).
|
||||
*/
|
||||
func (f *S3File) Readdir(count int) ([]fs.FileInfo, error) {
|
||||
if count > 0 {
|
||||
return nil, errors.New("returning a limited number of directory entry is not supported in readdir")
|
||||
}
|
||||
|
||||
if f.path.class == ROOT {
|
||||
return f.readDirRoot(count)
|
||||
} else {
|
||||
return f.readDirChild(count)
|
||||
}
|
||||
}
|
||||
|
||||
func (f *S3File) readDirRoot(count int) ([]fs.FileInfo, error) {
|
||||
buckets, err := f.fs.mc.ListBuckets(f.fs.ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
entries := make([]fs.FileInfo, 0, len(buckets))
|
||||
for _, bucket := range buckets {
|
||||
//log.Println("Stat from GarageFile.readDirRoot()", "/"+bucket.Name)
|
||||
nf, err := NewS3Stat(f.fs, "/"+bucket.Name)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
entries = append(entries, nf)
|
||||
}
|
||||
|
||||
return entries, nil
|
||||
}
|
||||
|
||||
func (f *S3File) readDirChild(count int) ([]fs.FileInfo, error) {
|
||||
prefix := f.path.key
|
||||
if len(prefix) > 0 && prefix[len(prefix)-1:] != "/" {
|
||||
prefix = prefix + "/"
|
||||
}
|
||||
|
||||
objs_info := f.fs.mc.ListObjects(f.fs.ctx, f.path.bucket, minio.ListObjectsOptions{
|
||||
Prefix: prefix,
|
||||
Recursive: false,
|
||||
})
|
||||
|
||||
entries := make([]fs.FileInfo, 0)
|
||||
for object := range objs_info {
|
||||
if object.Err != nil {
|
||||
return nil, object.Err
|
||||
}
|
||||
//log.Println("Stat from GarageFile.readDirChild()", path.Join("/", f.path.bucket, object.Key))
|
||||
nf, err := NewS3StatFromObjectInfo(f.fs, f.path.bucket, object)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
entries = append(entries, nf)
|
||||
}
|
||||
|
||||
return entries, nil
|
||||
}
|
||||
|
||||
func (f *S3File) Stat() (fs.FileInfo, error) {
|
||||
return NewS3Stat(f.fs, f.path.path)
|
||||
}
|
||||
66
s3_fs.go
Normal file
66
s3_fs.go
Normal file
|
|
@ -0,0 +1,66 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"os"
|
||||
"time"
|
||||
|
||||
"github.com/minio/minio-go/v7"
|
||||
"golang.org/x/net/webdav"
|
||||
)
|
||||
|
||||
/*
|
||||
* S3FS lifetime is limited to a single request
|
||||
* Conversely, Golang's abstraction has been thought to be shared between users
|
||||
* Sharing an instance between users would be very dangerous (as we would need many checks between shared values)
|
||||
*/
|
||||
type S3FS struct {
|
||||
cache map[string]*S3Stat
|
||||
mc *minio.Client
|
||||
ctx context.Context
|
||||
}
|
||||
|
||||
func NewS3FS(mc *minio.Client) S3FS {
|
||||
return S3FS{
|
||||
cache: make(map[string]*S3Stat),
|
||||
mc: mc,
|
||||
}
|
||||
}
|
||||
|
||||
func (s S3FS) Mkdir(ctx context.Context, name string, perm os.FileMode) error {
|
||||
s.ctx = ctx
|
||||
return errors.New("Not implemented Mkdir")
|
||||
}
|
||||
|
||||
func (s S3FS) OpenFile(ctx context.Context, name string, flag int, perm os.FileMode) (webdav.File, error) {
|
||||
s.ctx = ctx
|
||||
|
||||
// If the file does not exist when opening it, we create a stub
|
||||
if _, ok := s.cache[name]; !ok {
|
||||
st := new(S3Stat)
|
||||
st.fs = &s
|
||||
st.path = NewS3Path(name)
|
||||
st.path.class = OBJECT
|
||||
st.obj.Key = st.path.key
|
||||
st.obj.LastModified = time.Now()
|
||||
s.cache[name] = st
|
||||
}
|
||||
|
||||
return NewS3File(&s, name)
|
||||
}
|
||||
|
||||
func (s S3FS) RemoveAll(ctx context.Context, name string) error {
|
||||
s.ctx = ctx
|
||||
return errors.New("Not implemented RemoveAll")
|
||||
}
|
||||
|
||||
func (s S3FS) Rename(ctx context.Context, oldName, newName string) error {
|
||||
s.ctx = ctx
|
||||
return errors.New("Not implemented Rename")
|
||||
}
|
||||
|
||||
func (s S3FS) Stat(ctx context.Context, name string) (os.FileInfo, error) {
|
||||
s.ctx = ctx
|
||||
return NewS3Stat(&s, name)
|
||||
}
|
||||
57
s3_path.go
Normal file
57
s3_path.go
Normal file
|
|
@ -0,0 +1,57 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"path"
|
||||
"strings"
|
||||
|
||||
"github.com/minio/minio-go/v7"
|
||||
)
|
||||
|
||||
type S3Class int
|
||||
|
||||
const (
|
||||
ROOT S3Class = 1 << iota
|
||||
BUCKET
|
||||
COMMON_PREFIX
|
||||
OBJECT
|
||||
OPAQUE_KEY
|
||||
|
||||
KEY = COMMON_PREFIX | OBJECT | OPAQUE_KEY
|
||||
)
|
||||
|
||||
type S3Path struct {
|
||||
path string
|
||||
class S3Class
|
||||
bucket string
|
||||
key string
|
||||
}
|
||||
|
||||
func NewS3Path(path string) S3Path {
|
||||
exploded_path := strings.SplitN(path, "/", 3)
|
||||
|
||||
// If there is no bucket name (eg. "/")
|
||||
if len(exploded_path) < 2 || exploded_path[1] == "" {
|
||||
return S3Path{path, ROOT, "", ""}
|
||||
}
|
||||
|
||||
// If there is no key
|
||||
if len(exploded_path) < 3 || exploded_path[2] == "" {
|
||||
return S3Path{path, BUCKET, exploded_path[1], ""}
|
||||
}
|
||||
|
||||
return S3Path{path, OPAQUE_KEY, exploded_path[1], exploded_path[2]}
|
||||
}
|
||||
|
||||
func NewTrustedS3Path(bucket string, obj minio.ObjectInfo) S3Path {
|
||||
cl := OBJECT
|
||||
if obj.Key[len(obj.Key)-1:] == "/" {
|
||||
cl = COMMON_PREFIX
|
||||
}
|
||||
|
||||
return S3Path{
|
||||
path: path.Join("/", bucket, obj.Key),
|
||||
bucket: bucket,
|
||||
key: obj.Key,
|
||||
class: cl,
|
||||
}
|
||||
}
|
||||
128
s3_stat.go
Normal file
128
s3_stat.go
Normal file
|
|
@ -0,0 +1,128 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io/fs"
|
||||
"path"
|
||||
"time"
|
||||
|
||||
"github.com/minio/minio-go/v7"
|
||||
)
|
||||
|
||||
type S3Stat struct {
|
||||
fs *S3FS
|
||||
obj minio.ObjectInfo
|
||||
path S3Path
|
||||
}
|
||||
|
||||
/*
|
||||
* Stat a path knowing its ObjectInfo
|
||||
*/
|
||||
func NewS3StatFromObjectInfo(fs *S3FS, bucket string, obj minio.ObjectInfo) (*S3Stat, error) {
|
||||
s := new(S3Stat)
|
||||
s.path = NewTrustedS3Path(bucket, obj)
|
||||
s.obj = obj
|
||||
s.fs = fs
|
||||
|
||||
fs.cache[s.path.path] = s
|
||||
return s, nil
|
||||
}
|
||||
|
||||
/*
|
||||
* Stat a path without additional information
|
||||
*/
|
||||
func NewS3Stat(fs *S3FS, path string) (*S3Stat, error) {
|
||||
cache := fs.cache
|
||||
if entry, ok := cache[path]; ok {
|
||||
return entry, nil
|
||||
}
|
||||
|
||||
s := new(S3Stat)
|
||||
s.fs = fs
|
||||
s.path = NewS3Path(path)
|
||||
if err := s.Refresh(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if s.path.class&OPAQUE_KEY != 0 {
|
||||
return nil, errors.New("Failed to precisely determine the key type, this a logic error.")
|
||||
}
|
||||
|
||||
cache[path] = s
|
||||
cache[s.path.path] = s
|
||||
return s, nil
|
||||
}
|
||||
|
||||
func (s *S3Stat) Refresh() error {
|
||||
if s.path.class == ROOT || s.path.class == BUCKET {
|
||||
return nil
|
||||
}
|
||||
|
||||
mc := s.fs.mc
|
||||
|
||||
// Compute the prefix to have the desired behaviour for our stat logic
|
||||
prefix := s.path.key
|
||||
if prefix[len(prefix)-1:] == "/" {
|
||||
prefix = prefix[:len(prefix)-1]
|
||||
}
|
||||
|
||||
// Get info and check if the key exists
|
||||
objs_info := mc.ListObjects(s.fs.ctx, s.path.bucket, minio.ListObjectsOptions{
|
||||
Prefix: prefix,
|
||||
Recursive: false,
|
||||
})
|
||||
|
||||
found := false
|
||||
for object := range objs_info {
|
||||
if object.Err != nil {
|
||||
return object.Err
|
||||
}
|
||||
|
||||
if object.Key == prefix || object.Key == prefix+"/" {
|
||||
s.obj = object
|
||||
s.path = NewTrustedS3Path(s.path.bucket, object)
|
||||
found = true
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
if !found {
|
||||
return fs.ErrNotExist
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (s *S3Stat) Name() string {
|
||||
if s.path.class == ROOT {
|
||||
return "/"
|
||||
} else if s.path.class == BUCKET {
|
||||
return s.path.bucket
|
||||
} else {
|
||||
return path.Base(s.path.key)
|
||||
}
|
||||
}
|
||||
|
||||
func (s *S3Stat) Size() int64 {
|
||||
return s.obj.Size
|
||||
}
|
||||
|
||||
func (s *S3Stat) Mode() fs.FileMode {
|
||||
if s.path.class == OBJECT {
|
||||
return fs.ModePerm
|
||||
} else {
|
||||
return fs.ModeDir | fs.ModePerm
|
||||
}
|
||||
}
|
||||
|
||||
func (s *S3Stat) ModTime() time.Time {
|
||||
return s.obj.LastModified
|
||||
}
|
||||
|
||||
func (s *S3Stat) IsDir() bool {
|
||||
return s.path.class != OBJECT
|
||||
}
|
||||
|
||||
func (s *S3Stat) Sys() interface{} {
|
||||
return nil
|
||||
}
|
||||
28
webdav.go
Normal file
28
webdav.go
Normal file
|
|
@ -0,0 +1,28 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"github.com/minio/minio-go/v7"
|
||||
"golang.org/x/net/webdav"
|
||||
"log"
|
||||
"net/http"
|
||||
)
|
||||
|
||||
type WebDav struct {
|
||||
WithConfig *Config
|
||||
}
|
||||
|
||||
func (wd WebDav) WithMC(mc *minio.Client) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
(&webdav.Handler{
|
||||
Prefix: wd.WithConfig.DavPath,
|
||||
FileSystem: NewS3FS(mc),
|
||||
LockSystem: webdav.NewMemLS(),
|
||||
Logger: func(r *http.Request, err error) {
|
||||
log.Printf("INFO: %s %s %s\n", r.RemoteAddr, r.Method, r.URL)
|
||||
if err != nil {
|
||||
log.Printf("ERR: %v", err)
|
||||
}
|
||||
},
|
||||
}).ServeHTTP(w, r)
|
||||
})
|
||||
}
|
||||
Loading…
Reference in a new issue