filebrowser/filemanager.go

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package filemanager
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import (
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"errors"
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"log"
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"net/http"
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"os"
"os/exec"
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"regexp"
"strings"
rice "github.com/GeertJohan/go.rice"
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"github.com/asdine/storm"
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"github.com/mholt/caddy"
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"golang.org/x/net/webdav"
)
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var (
// ErrDuplicated occurs when you try to create a user that already exists.
ErrDuplicated = errors.New("Duplicated user")
)
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// FileManager is a file manager instance. It should be creating using the
// 'New' function and not directly.
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type FileManager struct {
// The BoltDB database for this instance.
db *storm.DB
// The key used to sign the JWT tokens.
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key []byte
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// The static assets.
assets *rice.Box
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// PrefixURL is a part of the URL that is already trimmed from the request URL before it
// arrives to our handlers. It may be useful when using File Manager as a middleware
// such as in caddy-filemanager plugin. It is only useful in certain situations.
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PrefixURL string
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// BaseURL is the path where the GUI will be accessible. It musn't end with
// a trailing slash and mustn't contain PrefixURL, if set. It shouldn't be
// edited directly. Use SetBaseURL.
BaseURL string
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// Users is a map with the different configurations for each user.
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Users map[string]*User
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// A map of events to a slice of commands.
Commands map[string][]string
// The plugins that have been plugged in.
Plugins map[string]Plugin
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}
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// Command is a command function.
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type Command func(r *http.Request, m *FileManager, u *User) error
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// User contains the configuration for each user. It should be created
// using NewUser on a File Manager instance.
type User struct {
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// ID is the required primary key with auto increment0
ID int `storm:"id,increment"`
// Username is the user username used to login.
Username string `json:"username" storm:"index,unique"`
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// The hashed password. This never reaches the front-end because it's temporarily
// emptied during JSON marshall.
Password string `json:"password"`
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// Tells if this user is an admin.
Admin bool `json:"admin"`
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// FileSystem is the virtual file system the user has access.
FileSystem webdav.Dir `json:"filesystem"`
// Rules is an array of access and deny rules.
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Rules []*Rule `json:"rules"`
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// Costum styles for this user.
CSS string `json:"css"`
// These indicate if the user can perform certain actions.
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AllowNew bool `json:"allowNew"` // Create files and folders
AllowEdit bool `json:"allowEdit"` // Edit/rename files
AllowCommands bool `json:"allowCommands"` // Execute commands
// Commands is the list of commands the user can execute.
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Commands []string `json:"commands"`
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}
// Rule is a dissalow/allow rule.
type Rule struct {
// Regex indicates if this rule uses Regular Expressions or not.
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Regex bool `json:"regex"`
// Allow indicates if this is an allow rule. Set 'false' to be a disallow rule.
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Allow bool `json:"allow"`
// Path is the corresponding URL path for this rule.
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Path string `json:"path"`
// Regexp is the regular expression. Only use this when 'Regex' was set to true.
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Regexp *Regexp `json:"regexp"`
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}
// Regexp is a regular expression wrapper around native regexp.
type Regexp struct {
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Raw string `json:"raw"`
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regexp *regexp.Regexp
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}
// Plugin is a File Manager plugin.
type Plugin interface {
// The JavaScript that will be injected into the main page.
JavaScript() string
// If the Plugin returns (0, nil), the executation of File Manager will procced as usual.
// Otherwise it will stop.
BeforeAPI(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error)
AfterAPI(c *RequestContext, w http.ResponseWriter, r *http.Request) (int, error)
}
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// DefaultUser is used on New, when no 'base' user is provided.
var DefaultUser = User{
Username: "admin",
Password: "admin",
AllowCommands: true,
AllowEdit: true,
AllowNew: true,
Commands: []string{},
Rules: []*Rule{},
CSS: "",
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Admin: true,
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FileSystem: webdav.Dir("."),
}
// New creates a new File Manager instance. If 'database' file already
// exists, it will load the users from there. Otherwise, a new user
// will be created using the 'base' variable. The 'base' User should
// not have the Password field hashed.
func New(database string, base User) (*FileManager, error) {
// Creates a new File Manager instance with the Users
// map and Assets box.
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m := &FileManager{
Users: map[string]*User{},
assets: rice.MustFindBox("./assets/dist"),
Plugins: map[string]Plugin{},
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}
// Tries to open a database on the location provided. This
// function will automatically create a new one if it doesn't
// exist.
db, err := storm.Open(database)
if err != nil {
return nil, err
}
// Tries to get the encryption key from the database.
// If it doesn't exist, create a new one of 256 bits.
err = db.Get("config", "key", &m.key)
if err != nil && err == storm.ErrNotFound {
m.key = []byte(randomString(64))
err = db.Set("config", "key", m.key)
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}
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if err != nil {
return nil, err
}
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// Tries to get the event commands from the database.
// If they don't exist, initialize them.
err = db.Get("config", "commands", &m.Commands)
if err != nil && err == storm.ErrNotFound {
m.Commands = map[string][]string{
"before_save": []string{},
"after_save": []string{},
}
err = db.Set("config", "commands", m.Commands)
}
if err != nil {
return nil, err
}
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// Tries to fetch the users from the database and if there are
// any, add them to the current File Manager instance.
var users []User
err = db.All(&users)
if err != nil {
return nil, err
}
for i := range users {
m.Users[users[i].Username] = &users[i]
}
// If there are no users in the database, it creates a new one
// based on 'base' User that must be provided by the function caller.
if len(users) == 0 {
// Hashes the password.
pw, err := hashPassword(base.Password)
if err != nil {
return nil, err
}
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// The first user must be an administrator.
base.Admin = true
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base.Password = pw
// Saves the user to the database.
if err := db.Save(&base); err != nil {
return nil, err
}
m.Users[base.Username] = &base
}
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// Attaches db to this File Manager instance.
m.db = db
return m, nil
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}
// RootURL returns the actual URL where
// File Manager interface can be accessed.
func (m FileManager) RootURL() string {
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return m.PrefixURL + m.BaseURL
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}
// SetPrefixURL updates the prefixURL of a File
// Manager object.
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func (m *FileManager) SetPrefixURL(url string) {
url = strings.TrimPrefix(url, "/")
url = strings.TrimSuffix(url, "/")
url = "/" + url
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m.PrefixURL = strings.TrimSuffix(url, "/")
}
// SetBaseURL updates the baseURL of a File Manager
// object.
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func (m *FileManager) SetBaseURL(url string) {
url = strings.TrimPrefix(url, "/")
url = strings.TrimSuffix(url, "/")
url = "/" + url
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m.BaseURL = strings.TrimSuffix(url, "/")
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}
// RegisterPlugin registers a plugin to a File Manager instance and
// loads its options from the database.
func (m *FileManager) RegisterPlugin(name string, plugin Plugin) error {
if _, ok := m.Plugins[name]; ok {
return errors.New("Plugin already registred")
}
err := m.db.Get("plugins", name, &plugin)
if err != nil && err == storm.ErrNotFound {
err = m.db.Set("plugins", name, plugin)
}
if err != nil {
return err
}
m.Plugins[name] = plugin
return nil
}
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// ServeHTTP determines if the request is for this plugin, and if all prerequisites are met.
func (m *FileManager) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
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// TODO: Handle errors here and make it compatible with http.Handler
code, err := serveHTTP(&RequestContext{
FM: m,
User: nil,
FI: nil,
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}, w, r)
if code != 0 && err != nil {
w.WriteHeader(code)
w.Write([]byte(err.Error()))
return 0, nil
}
return code, err
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}
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// Allowed checks if the user has permission to access a directory/file.
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func (u User) Allowed(url string) bool {
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var rule *Rule
i := len(u.Rules) - 1
for i >= 0 {
rule = u.Rules[i]
if rule.Regex {
if rule.Regexp.MatchString(url) {
return rule.Allow
}
} else if strings.HasPrefix(url, rule.Path) {
return rule.Allow
}
i--
}
return true
}
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// SetScope updates a user scope and its virtual file system.
// If the user string is blank, it will change the base scope.
func (u *User) SetScope(scope string) {
scope = strings.TrimSuffix(scope, "/")
u.FileSystem = webdav.Dir(scope)
}
// MatchString checks if this string matches the regular expression.
func (r *Regexp) MatchString(s string) bool {
if r.regexp == nil {
r.regexp = regexp.MustCompile(r.Raw)
}
return r.regexp.MatchString(s)
}
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// Runner runs the commands for a certain event type.
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func (m FileManager) Runner(event string, path string) error {
for _, command := range m.Commands[event] {
args := strings.Split(command, " ")
nonblock := false
if len(args) > 1 && args[len(args)-1] == "&" {
// Run command in background; non-blocking
nonblock = true
args = args[:len(args)-1]
}
command, args, err := caddy.SplitCommandAndArgs(strings.Join(args, " "))
if err != nil {
return err
}
cmd := exec.Command(command, args...)
cmd.Env = append(os.Environ(), "file="+path)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if nonblock {
log.Printf("[INFO] Nonblocking Command:\"%s %s\"", command, strings.Join(args, " "))
if err := cmd.Start(); err != nil {
return err
}
continue
}
log.Printf("[INFO] Blocking Command:\"%s %s\"", command, strings.Join(args, " "))
if err := cmd.Run(); err != nil {
return err
}
}
return nil
}