Almost working!

Former-commit-id: b996f4f14f3ffd92fae77d86e92d077b35ea080c [formerly e4b74308ab158ad24bd6b3dc1ce615265f972e6c] [formerly 1ea38eac2569ba58e864f1edceb56daabff5e53d [formerly 5b619337df]]
Former-commit-id: 9117f9eeff1bbc259164b20f0561790b3c393319 [formerly c3c7b1c100c54a5ec0af528806e28b31c67da0ca]
Former-commit-id: 0d95a7f55f6f3ab9f89e1c5b34db927e5763c98d

bolt/config.go

@@ -2,6 +2,7 @@ package bolt
 
 import (
 	"github.com/asdine/storm"
+	fm "github.com/hacdias/filemanager"
 )
 
 type ConfigStore struct {
@@ -9,7 +10,12 @@ type ConfigStore struct {
 }
 
 func (c ConfigStore) Get(name string, to interface{}) error {
-	return c.DB.Get("config", name, to)
+	err := c.DB.Get("config", name, to)
+	if err == storm.ErrNotFound {
+		return fm.ErrNotExist
+	}
+
+	return err
 }
 
 func (c ConfigStore) Save(name string, from interface{}) error {

bolt/share.go

@@ -12,16 +12,24 @@ type ShareStore struct {
 func (s ShareStore) Get(hash string) (*fm.ShareLink, error) {
 	var v *fm.ShareLink
 	err := s.DB.One("Hash", hash, &v)
+	if err == storm.ErrNotFound {
+		return v, fm.ErrNotExist
+	}
+
 	return v, err
 }
 
 func (s ShareStore) GetByPath(hash string) ([]*fm.ShareLink, error) {
 	var v []*fm.ShareLink
 	err := s.DB.Find("Path", hash, &v)
+	if err == storm.ErrNotFound {
+		return v, fm.ErrNotExist
+	}
+
 	return v, err
 }
 
-func (s ShareStore) Gets(hash string) ([]*fm.ShareLink, error) {
+func (s ShareStore) Gets() ([]*fm.ShareLink, error) {
 	var v []*fm.ShareLink
 	err := s.DB.All(&v)
 	return v, err

bolt/users.go

@@ -15,7 +15,7 @@ func (u UsersStore) Get(id int) (*fm.User, error) {
 	var us *fm.User
 	err := u.DB.One("ID", id, us)
 	if err == storm.ErrNotFound {
-		return nil, fm.ErrUserNotExist
+		return nil, fm.ErrNotExist
 	}
 
 	if err != nil {

cmd/filemanager/main.go

@@ -10,9 +10,14 @@ import (
 	"path/filepath"
 	"strings"
 
+	"github.com/asdine/storm"
+
 	lumberjack "gopkg.in/natefinch/lumberjack.v2"
 
 	"github.com/hacdias/filemanager"
+	"github.com/hacdias/filemanager/bolt"
+	h "github.com/hacdias/filemanager/http"
+	"github.com/hacdias/filemanager/staticgen"
 	"github.com/hacdias/fileutils"
 	flag "github.com/spf13/pflag"
 	"github.com/spf13/viper"
@@ -25,7 +30,7 @@ var (
 	scope         string
 	commands      string
 	logfile       string
-	staticgen     string
+	staticg       string
 	locale        string
 	port          int
 	noAuth        bool
@@ -51,7 +56,7 @@ func init() {
 	flag.BoolVar(&allowNew, "allow-new", true, "Default allow new option for new users")
 	flag.BoolVar(&noAuth, "no-auth", false, "Disables authentication")
 	flag.StringVar(&locale, "locale", "en", "Default locale for new users")
-	flag.StringVar(&staticgen, "staticgen", "", "Static Generator you want to enable")
+	flag.StringVar(&staticg, "staticgen", "", "Static Generator you want to enable")
 	flag.BoolVarP(&showVer, "version", "v", false, "Show version")
 }
 
@@ -148,52 +153,6 @@ func main() {
 		})
 	}
 
-	// Create a File Manager instance.
-	fm, err := filemanager.New(viper.GetString("Database"), filemanager.User{
-		AllowCommands: viper.GetBool("AllowCommands"),
-		AllowEdit:     viper.GetBool("AllowEdit"),
-		AllowNew:      viper.GetBool("AllowNew"),
-		AllowPublish:  viper.GetBool("AllowPublish"),
-		Commands:      viper.GetStringSlice("Commands"),
-		Rules:         []*filemanager.Rule{},
-		Locale:        viper.GetString("Locale"),
-		CSS:           "",
-		FileSystem:    fileutils.Dir(viper.GetString("Scope")),
-	})
-
-	if viper.GetBool("NoAuth") {
-		fm.NoAuth = true
-	}
-
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	switch viper.GetString("StaticGen") {
-	case "hugo":
-		hugo := &filemanager.Hugo{
-			Root:        viper.GetString("Scope"),
-			Public:      filepath.Join(viper.GetString("Scope"), "public"),
-			Args:        []string{},
-			CleanPublic: true,
-		}
-
-		if err = fm.EnableStaticGen(hugo); err != nil {
-			log.Fatal(err)
-		}
-	case "jekyll":
-		jekyll := &filemanager.Jekyll{
-			Root:        viper.GetString("Scope"),
-			Public:      filepath.Join(viper.GetString("Scope"), "_site"),
-			Args:        []string{"build"},
-			CleanPublic: true,
-		}
-
-		if err = fm.EnableStaticGen(jekyll); err != nil {
-			log.Fatal(err)
-		}
-	}
-
 	// Builds the address and a listener.
 	laddr := viper.GetString("Address") + ":" + viper.GetString("Port")
 	listener, err := net.Listen("tcp", laddr)
@@ -205,7 +164,68 @@ func main() {
 	fmt.Println("Listening on", listener.Addr().String())
 
 	// Starts the server.
-	if err := http.Serve(listener, fm); err != nil {
+	if err := http.Serve(listener, handler()); err != nil {
 		log.Fatal(err)
 	}
 }
+
+func handler() http.Handler {
+	db, err := storm.Open(viper.GetString("Database"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fm := &filemanager.FileManager{
+		NoAuth:    viper.GetBool("NoAuth"),
+		BaseURL:   "",
+		PrefixURL: "",
+		DefaultUser: &filemanager.User{
+			AllowCommands: viper.GetBool("AllowCommands"),
+			AllowEdit:     viper.GetBool("AllowEdit"),
+			AllowNew:      viper.GetBool("AllowNew"),
+			AllowPublish:  viper.GetBool("AllowPublish"),
+			Commands:      viper.GetStringSlice("Commands"),
+			Rules:         []*filemanager.Rule{},
+			Locale:        viper.GetString("Locale"),
+			CSS:           "",
+			FileSystem:    fileutils.Dir(viper.GetString("Scope")),
+		},
+		Store: &filemanager.Store{
+			Config: bolt.ConfigStore{DB: db},
+			Users:  bolt.UsersStore{DB: db},
+			Share:  bolt.ShareStore{DB: db},
+		},
+	}
+
+	err = fm.Load()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	switch viper.GetString("StaticGen") {
+	case "hugo":
+		hugo := &staticgen.Hugo{
+			Root:        viper.GetString("Scope"),
+			Public:      filepath.Join(viper.GetString("Scope"), "public"),
+			Args:        []string{},
+			CleanPublic: true,
+		}
+
+		if err = fm.Attach(hugo); err != nil {
+			log.Fatal(err)
+		}
+	case "jekyll":
+		jekyll := &staticgen.Jekyll{
+			Root:        viper.GetString("Scope"),
+			Public:      filepath.Join(viper.GetString("Scope"), "_site"),
+			Args:        []string{"build"},
+			CleanPublic: true,
+		}
+
+		if err = fm.Attach(jekyll); err != nil {
+			log.Fatal(err)
+		}
+	}
+
+	return h.ServeHTTP(fm)
+}

file.go

@@ -7,7 +7,6 @@ import (
 	"crypto/sha256"
 	"crypto/sha512"
 	"encoding/hex"
-	"errors"
 	"hash"
 	"io"
 	"io/ioutil"
@@ -23,10 +22,6 @@ import (
 	"github.com/gohugoio/hugo/parser"
 )
 
-var (
-	ErrInvalidOption = errors.New("Invalid option")
-)
-
 // File contains the information about a particular file or directory.
 type File struct {
 	// Indicates the Kind of view on the front-end (Listing, editor or preview).

filemanager.go

@@ -54,21 +54,38 @@
 package filemanager
 
 import (
+	"crypto/rand"
 	"errors"
 	"log"
 	"net/http"
 	"os"
 	"os/exec"
 	"reflect"
+	"regexp"
 	"strings"
 	"time"
 
+	"golang.org/x/crypto/bcrypt"
+
 	rice "github.com/GeertJohan/go.rice"
 	"github.com/asdine/storm"
+	"github.com/hacdias/fileutils"
 	"github.com/mholt/caddy"
 	"github.com/robfig/cron"
 )
 
+var (
+	ErrExist              = errors.New("the resource already exists")
+	ErrNotExist           = errors.New("the resource does not exist")
+	ErrEmptyRequest       = errors.New("request body is empty")
+	ErrEmptyPassword      = errors.New("password is empty")
+	ErrEmptyUsername      = errors.New("username is empty")
+	ErrEmptyScope         = errors.New("scope is empty")
+	ErrWrongDataType      = errors.New("wrong data type")
+	ErrInvalidUpdateField = errors.New("invalid field to update")
+	ErrInvalidOption      = errors.New("Invalid option")
+)
+
 // FileManager is a file manager instance. It should be creating using the
 // 'New' function and not directly.
 type FileManager struct {
@@ -110,6 +127,7 @@ type FileManager struct {
 // Command is a command function.
 type Command func(r *http.Request, m *FileManager, u *User) error
 
+// Load loads the configuration from the database.
 func (m *FileManager) Load() error {
 	// Creates a new File Manager instance with the Users
 	// map and Assets box.
@@ -215,30 +233,6 @@ func (m *FileManager) SetBaseURL(url string) {
 	m.BaseURL = strings.TrimSuffix(url, "/")
 }
 
-// ServeHTTP handles the request.
-func (m *FileManager) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	/* code, err := serveHTTP(&RequestContext{
-		FileManager: m,
-		User:        nil,
-		File:        nil,
-	}, w, r)
-
-	if code >= 400 {
-		w.WriteHeader(code)
-
-		if err == nil {
-			txt := http.StatusText(code)
-			log.Printf("%v: %v %v\n", r.URL.Path, code, txt)
-			w.Write([]byte(txt))
-		}
-	}
-
-	if err != nil {
-		log.Print(err)
-		w.Write([]byte(err.Error()))
-	} */
-}
-
 // Attach attaches a static generator to the current File Manager.
 func (m *FileManager) Attach(s StaticGen) error {
 	if reflect.TypeOf(s).Kind() != reflect.Ptr {
@@ -329,3 +323,193 @@ func (m FileManager) Runner(event string, path string) error {
 
 	return nil
 }
+
+// DefaultUser is used on New, when no 'base' user is provided.
+var DefaultUser = User{
+	AllowCommands: true,
+	AllowEdit:     true,
+	AllowNew:      true,
+	AllowPublish:  true,
+	Commands:      []string{},
+	Rules:         []*Rule{},
+	CSS:           "",
+	Admin:         true,
+	Locale:        "en",
+	FileSystem:    fileutils.Dir("."),
+}
+
+// User contains the configuration for each user.
+type User struct {
+	// 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"`
+
+	// The hashed password. This never reaches the front-end because it's temporarily
+	// emptied during JSON marshall.
+	Password string `json:"password"`
+
+	// Tells if this user is an admin.
+	Admin bool `json:"admin"`
+
+	// FileSystem is the virtual file system the user has access.
+	FileSystem fileutils.Dir `json:"filesystem"`
+
+	// Rules is an array of access and deny rules.
+	Rules []*Rule `json:"rules"`
+
+	// Custom styles for this user.
+	CSS string `json:"css"`
+
+	// Locale is the language of the user.
+	Locale string `json:"locale"`
+
+	// These indicate if the user can perform certain actions.
+	AllowNew      bool `json:"allowNew"`      // Create files and folders
+	AllowEdit     bool `json:"allowEdit"`     // Edit/rename files
+	AllowCommands bool `json:"allowCommands"` // Execute commands
+	AllowPublish  bool `json:"allowPublish"`  // Publish content (to use with static gen)
+
+	// Commands is the list of commands the user can execute.
+	Commands []string `json:"commands"`
+}
+
+// Allowed checks if the user has permission to access a directory/file.
+func (u User) Allowed(url string) bool {
+	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
+}
+
+// Rule is a dissalow/allow rule.
+type Rule struct {
+	// Regex indicates if this rule uses Regular Expressions or not.
+	Regex bool `json:"regex"`
+
+	// Allow indicates if this is an allow rule. Set 'false' to be a disallow rule.
+	Allow bool `json:"allow"`
+
+	// Path is the corresponding URL path for this rule.
+	Path string `json:"path"`
+
+	// Regexp is the regular expression. Only use this when 'Regex' was set to true.
+	Regexp *Regexp `json:"regexp"`
+}
+
+// Regexp is a regular expression wrapper around native regexp.
+type Regexp struct {
+	Raw    string `json:"raw"`
+	regexp *regexp.Regexp
+}
+
+// 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)
+}
+
+// ShareLink is the information needed to build a shareable link.
+type ShareLink struct {
+	Hash       string    `json:"hash" storm:"id,index"`
+	Path       string    `json:"path" storm:"index"`
+	Expires    bool      `json:"expires"`
+	ExpireDate time.Time `json:"expireDate"`
+}
+
+// Store is a collection of the stores needed to get
+// and save information.
+type Store struct {
+	Users  UsersStore
+	Config ConfigStore
+	Share  ShareStore
+}
+
+// UsersStore is the interface to manage users.
+type UsersStore interface {
+	Get(id int) (*User, error)
+	Gets() ([]*User, error)
+	Save(u *User) error
+	Update(u *User, fields ...string) error
+	Delete(id int) error
+}
+
+// ConfigStore is the interface to manage configuration.
+type ConfigStore interface {
+	Get(name string, to interface{}) error
+	Save(name string, from interface{}) error
+}
+
+// ShareStore is the interface to manage share links.
+type ShareStore interface {
+	Get(hash string) (*ShareLink, error)
+	GetByPath(path string) ([]*ShareLink, error)
+	Gets() ([]*ShareLink, error)
+	Save(s *ShareLink) error
+	Delete(hash string) error
+}
+
+// StaticGen is a static website generator.
+type StaticGen interface {
+	SettingsPath() string
+	Name() string
+	Setup() error
+
+	Hook(c *Context, w http.ResponseWriter, r *http.Request) (int, error)
+	Preview(c *Context, w http.ResponseWriter, r *http.Request) (int, error)
+	Publish(c *Context, w http.ResponseWriter, r *http.Request) (int, error)
+}
+
+// Context contains the needed information to make handlers work.
+type Context struct {
+	*FileManager
+	User *User
+	File *File
+	// On API handlers, Router is the APi handler we want.
+	Router string
+}
+
+// HashPassword generates an hash from a password using bcrypt.
+func HashPassword(password string) (string, error) {
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	return string(bytes), err
+}
+
+// CheckPasswordHash compares a password with an hash to check if they match.
+func CheckPasswordHash(password, hash string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	return err == nil
+}
+
+// GenerateRandomBytes returns securely generated random bytes.
+// It will return an fm.Error if the system's secure random
+// number generator fails to function correctly, in which
+// case the caller should not continue.
+func GenerateRandomBytes(n int) ([]byte, error) {
+	b := make([]byte, n)
+	_, err := rand.Read(b)
+	// Note that err == nil only if we read len(b) bytes.
+	if err != nil {
+		return nil, err
+	}
+
+	return b, nil
+}

http.go

@@ -1,23 +0,0 @@
-package filemanager
-
-import "net/http"
-
-// StaticGen is a static website generator.
-type StaticGen interface {
-	SettingsPath() string
-	Name() string
-	Setup() error
-
-	Hook(c *Context, w http.ResponseWriter, r *http.Request) (int, error)
-	Preview(c *Context, w http.ResponseWriter, r *http.Request) (int, error)
-	Publish(c *Context, w http.ResponseWriter, r *http.Request) (int, error)
-}
-
-// Context contains the needed information to make handlers work.
-type Context struct {
-	*FileManager
-	User *User
-	File *File
-	// On API handlers, Router is the APi handler we want.
-	Router string
-}

http/http.go

@@ -3,6 +3,7 @@ package http
 import (
 	"encoding/json"
 	"html/template"
+	"log"
 	"net/http"
 	"os"
 	"strings"
@@ -12,8 +13,34 @@ import (
 	fm "github.com/hacdias/filemanager"
 )
 
-// ServeHTTP is the main entry point of this HTML application.
+// ServeHTTP returns a function compatible with http.HandleFunc.
-func ServeHTTP(c *fm.Context, w http.ResponseWriter, r *http.Request) (int, error) {
+func ServeHTTP(m *fm.FileManager) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		code, err := serve(&fm.Context{
+			FileManager: m,
+			User:        nil,
+			File:        nil,
+		}, w, r)
+
+		if code >= 400 {
+			w.WriteHeader(code)
+
+			if err == nil {
+				txt := http.StatusText(code)
+				log.Printf("%v: %v %v\n", r.URL.Path, code, txt)
+				w.Write([]byte(txt))
+			}
+		}
+
+		if err != nil {
+			log.Print(err)
+			w.Write([]byte(err.Error()))
+		}
+	})
+}
+
+// serve is the main entry point of this HTML application.
+func serve(c *fm.Context, w http.ResponseWriter, r *http.Request) (int, error) {
 	// Checks if the URL contains the baseURL and strips it. Otherwise, it just
 	// returns a 404 fm.Error because we're not supposed to be here!
 	p := strings.TrimPrefix(r.URL.Path, c.BaseURL)

staticgen/jekyll.go

@@ -28,6 +28,11 @@ type Jekyll struct {
 	previewPath string
 }
 
+// Name is the plugin's name.
+func (j Jekyll) Name() string {
+	return "jekyll"
+}
+
 // SettingsPath retrieves the correct settings path.
 func (j Jekyll) SettingsPath() string {
 	return "/_config.yml"

user.go

@@ -1,188 +0,0 @@
-package filemanager
-
-import (
-	"crypto/rand"
-	"errors"
-	"regexp"
-	"strings"
-	"time"
-
-	"golang.org/x/crypto/bcrypt"
-
-	"github.com/hacdias/fileutils"
-)
-
-var (
-	ErrExist              = errors.New("the resource already exists")
-	ErrNotExist           = errors.New("the resource does not exist")
-	ErrEmptyRequest       = errors.New("request body is empty")
-	ErrEmptyPassword      = errors.New("password is empty")
-	ErrEmptyUsername      = errors.New("username is empty")
-	ErrEmptyScope         = errors.New("scope is empty")
-	ErrWrongDataType      = errors.New("wrong data type")
-	ErrInvalidUpdateField = errors.New("invalid field to update")
-)
-
-// DefaultUser is used on New, when no 'base' user is provided.
-var DefaultUser = User{
-	AllowCommands: true,
-	AllowEdit:     true,
-	AllowNew:      true,
-	AllowPublish:  true,
-	Commands:      []string{},
-	Rules:         []*Rule{},
-	CSS:           "",
-	Admin:         true,
-	Locale:        "en",
-	FileSystem:    fileutils.Dir("."),
-}
-
-// User contains the configuration for each user.
-type User struct {
-	// 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"`
-
-	// The hashed password. This never reaches the front-end because it's temporarily
-	// emptied during JSON marshall.
-	Password string `json:"password"`
-
-	// Tells if this user is an admin.
-	Admin bool `json:"admin"`
-
-	// FileSystem is the virtual file system the user has access.
-	FileSystem fileutils.Dir `json:"filesystem"`
-
-	// Rules is an array of access and deny rules.
-	Rules []*Rule `json:"rules"`
-
-	// Custom styles for this user.
-	CSS string `json:"css"`
-
-	// Locale is the language of the user.
-	Locale string `json:"locale"`
-
-	// These indicate if the user can perform certain actions.
-	AllowNew      bool `json:"allowNew"`      // Create files and folders
-	AllowEdit     bool `json:"allowEdit"`     // Edit/rename files
-	AllowCommands bool `json:"allowCommands"` // Execute commands
-	AllowPublish  bool `json:"allowPublish"`  // Publish content (to use with static gen)
-
-	// Commands is the list of commands the user can execute.
-	Commands []string `json:"commands"`
-}
-
-// Rule is a dissalow/allow rule.
-type Rule struct {
-	// Regex indicates if this rule uses Regular Expressions or not.
-	Regex bool `json:"regex"`
-
-	// Allow indicates if this is an allow rule. Set 'false' to be a disallow rule.
-	Allow bool `json:"allow"`
-
-	// Path is the corresponding URL path for this rule.
-	Path string `json:"path"`
-
-	// Regexp is the regular expression. Only use this when 'Regex' was set to true.
-	Regexp *Regexp `json:"regexp"`
-}
-
-// Regexp is a regular expression wrapper around native regexp.
-type Regexp struct {
-	Raw    string `json:"raw"`
-	regexp *regexp.Regexp
-}
-
-// Allowed checks if the user has permission to access a directory/file.
-func (u User) Allowed(url string) bool {
-	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
-}
-
-// 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)
-}
-
-type ShareLink struct {
-	Hash       string    `json:"hash" storm:"id,index"`
-	Path       string    `json:"path" storm:"index"`
-	Expires    bool      `json:"expires"`
-	ExpireDate time.Time `json:"expireDate"`
-}
-
-type Store struct {
-	Users  UsersStore
-	Config ConfigStore
-	Share  ShareStore
-}
-
-type UsersStore interface {
-	Get(id int) (*User, error)
-	Gets() ([]*User, error)
-	Save(u *User) error
-	Update(u *User, fields ...string) error
-	Delete(id int) error
-}
-
-type ConfigStore interface {
-	Get(name string, to interface{}) error
-	Save(name string, from interface{}) error
-}
-
-type ShareStore interface {
-	Get(hash string) (*ShareLink, error)
-	GetByPath(path string) ([]*ShareLink, error)
-	Gets() ([]*ShareLink, error)
-	Save(s *ShareLink) error
-	Delete(hash string) error
-}
-
-// HashPassword generates an hash from a password using bcrypt.
-func HashPassword(password string) (string, error) {
-	bytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
-	return string(bytes), err
-}
-
-// CheckPasswordHash compares a password with an hash to check if they match.
-func CheckPasswordHash(password, hash string) bool {
-	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
-	return err == nil
-}
-
-// GenerateRandomBytes returns securely generated random bytes.
-// It will return an fm.Error if the system's secure random
-// number generator fails to function correctly, in which
-// case the caller should not continue.
-func GenerateRandomBytes(n int) ([]byte, error) {
-	b := make([]byte, n)
-	_, err := rand.Read(b)
-	// Note that err == nil only if we read len(b) bytes.
-	if err != nil {
-		return nil, err
-	}
-
-	return b, nil
-}