fix(BREAKING): rename webdav/ --> lib/ (#36)

License: MIT
Signed-off-by: Henrique Dias <hacdias@gmail.com>

.circleci/config.yml

@@ -11,7 +11,7 @@ jobs:
       - image: circleci/golang:1.12
     steps:
       - checkout
-      - run: cd cmd/webdav && go build main.go
+      - run: go build main.go
   release:
     docker:
       - image: circleci/golang:1.12

.goreleaser.yml

@@ -1,6 +1,15 @@
+env:
+  - GO111MODULE=on
+
+before:
+  hooks:
+    - go mod download
+
 build:
-  main: cmd/webdav/main.go
+  main: main.go
   binary: webdav
+  ldflags:
+    - -s -w -X github.com/hacdias/webdav/cmd.version={{.Version}}
   goos:
     - darwin
     - linux
@@ -13,6 +22,14 @@ build:
     - 386
     - arm
     - arm64
+    - mips
+    - mipsle
+    - mips64
+    - mips64le
+  goarm:
+    - 5
+    - 6
+    - 7
   ignore:
     - goos: openbsd
       goarch: arm
@@ -23,7 +40,7 @@ build:
 
 archives:
   -
-    name_template: "{{.Os}}-{{.Arch}}-{{ .ProjectName }}"
+    name_template: "{{.Os}}-{{.Arch}}{{if .Arm}}v{{.Arm}}{{end}}-{{ .ProjectName }}"
     format: tar.gz
     format_overrides:
       - goos: windows

README.md

@@ -0,0 +1,76 @@
+# webdav
+
+[![Build](https://img.shields.io/circleci/project/github/hacdias/webdav/master.svg?style=flat-square)](https://circleci.com/gh/hacdias/webdav)
+[![Go Report Card](https://goreportcard.com/badge/github.com/hacdias/webdav?style=flat-square)](https://goreportcard.com/report/hacdias/webdav)
+[![Version](https://img.shields.io/github/release/hacdias/webdav.svg?style=flat-square)](https://github.com/hacdias/webdav/releases/latest)
+
+## Install
+
+Please refer to the [Releases page](https://github.com/hacdias/webdav/releases) for more information. There, you can either download the binaries or find the Docker commands to install WebDAV.
+
+## Usage
+
+```webdav``` command line interface is really easy to use so you can easily create a WebDAV server for your own user. By default, it runs on a random free port and supports JSON, YAML and TOML configuration. An example of a YAML configuration with the default configurations:
+
+```yaml
+# Server related settings
+address: 0.0.0.0
+port: 0
+auth: true
+tls: false
+cert: cert.pem
+key: key.pem
+prefix: /
+
+# Default user settings (will be merged)
+scope: .
+modify: true
+rules: []
+
+# CORS configuration
+cors:
+  enabled: true
+  credentials: true
+  allowed_headers:
+    - Depth
+  allowed_hosts:
+    - http://localhost:8080
+  allowed_methods:
+    - GET
+  exposed_headers:
+    - Content-Length
+    - Content-Range
+
+users:
+  - username: admin
+    password: admin
+    scope: /a/different/path
+  - username: encrypted
+    password: "{bcrypt}$2y$10$zEP6oofmXFeHaeMfBNLnP.DO8m.H.Mwhd24/TOX2MWLxAExXi4qgi"
+  - username: "{env}ENV_USERNAME"
+    password: "{env}ENV_PASSWORD"
+  - username: basic
+    password: basic
+    modify:   false
+    rules:
+      - regex: false
+        allow: false
+        path: /some/file
+```
+
+There are more ways to customize how you run WebDAV through flags and environment variables. Please run `webdav --help` for more information on that.
+
+### Systemd
+
+An example of how to use this with `systemd` is on [webdav.service.example](/webdav.service.example).
+
+### CORS
+
+The `allowed_*` properties are optional, the default value for each of them will be `*`. `exposed_headers` is optional as well, but is not set if not defined. Setting `credentials` to `true` will allow you to:
+
+1. Use `withCredentials = true` in javascript.
+2. Use the `username:password@host` syntax.
+
+## License
+
+MIT © [Henrique Dias](https://hacdias.com)

cmd/cmd.go

@@ -0,0 +1,12 @@
+package cmd
+
+import (
+	"log"
+)
+
+// Execute executes the commands.
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		log.Fatal(err)
+	}
+}

cmd/config.go

@@ -0,0 +1,207 @@
+package cmd
+
+import (
+	"errors"
+	"log"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/hacdias/webdav/v3/lib"
+	"github.com/spf13/pflag"
+	v "github.com/spf13/viper"
+	"golang.org/x/net/webdav"
+)
+
+func parseRules(raw []interface{}) []*lib.Rule {
+	rules := []*lib.Rule{}
+
+	for _, v := range raw {
+		if r, ok := v.(map[interface{}]interface{}); ok {
+			rule := &lib.Rule{
+				Regex: false,
+				Allow: false,
+				Path:  "",
+			}
+
+			if regex, ok := r["regex"].(bool); ok {
+				rule.Regex = regex
+			}
+
+			if allow, ok := r["allow"].(bool); ok {
+				rule.Allow = allow
+			}
+
+			path, ok := r["path"].(string)
+			if !ok {
+				continue
+			}
+
+			if rule.Regex {
+				rule.Regexp = regexp.MustCompile(path)
+			} else {
+				rule.Path = path
+			}
+
+			rules = append(rules, rule)
+		}
+	}
+
+	return rules
+}
+
+func loadFromEnv(v string) (string, error) {
+	v = strings.TrimPrefix(v, "{env}")
+	if v == "" {
+		return "", errors.New("no environment variable specified")
+	}
+
+	v = os.Getenv(v)
+	if v == "" {
+		return "", errors.New("the environment variable is empty")
+	}
+
+	return v, nil
+}
+
+func parseUsers(raw []interface{}, c *lib.Config) {
+	var err error
+	for _, v := range raw {
+		if u, ok := v.(map[interface{}]interface{}); ok {
+			username, ok := u["username"].(string)
+			if !ok {
+				log.Fatal("user needs an username")
+			}
+
+			if strings.HasPrefix(username, "{env}") {
+				username, err = loadFromEnv(username)
+				checkErr(err)
+			}
+
+			password, ok := u["password"].(string)
+			if !ok {
+				password = ""
+
+				if numPwd, ok := u["password"].(int); ok {
+					password = strconv.Itoa(numPwd)
+				}
+			}
+
+			if strings.HasPrefix(password, "{env}") {
+				password, err = loadFromEnv(password)
+				checkErr(err)
+			}
+
+			user := &lib.User{
+				Username: username,
+				Password: password,
+				Scope:    c.User.Scope,
+				Modify:   c.User.Modify,
+				Rules:    c.User.Rules,
+			}
+
+			if scope, ok := u["scope"].(string); ok {
+				user.Scope = scope
+			}
+
+			if modify, ok := u["modify"].(bool); ok {
+				user.Modify = modify
+			}
+
+			if rules, ok := u["rules"].([]interface{}); ok {
+				user.Rules = parseRules(rules)
+			}
+
+			user.Handler = &webdav.Handler{
+				Prefix:     c.User.Handler.Prefix,
+				FileSystem: webdav.Dir(user.Scope),
+				LockSystem: webdav.NewMemLS(),
+			}
+
+			c.Users[username] = user
+		}
+	}
+}
+
+func parseCors(cfg map[string]interface{}, c *lib.Config) {
+	cors := lib.CorsCfg{
+		Enabled:     cfg["enabled"].(bool),
+		Credentials: cfg["credentials"].(bool),
+	}
+
+	cors.AllowedHeaders = corsProperty("allowed_headers", cfg)
+	cors.AllowedHosts = corsProperty("allowed_hosts", cfg)
+	cors.AllowedMethods = corsProperty("allowed_methods", cfg)
+	cors.ExposedHeaders = corsProperty("exposed_headers", cfg)
+
+	c.Cors = cors
+}
+
+func corsProperty(property string, cfg map[string]interface{}) []string {
+	var def []string
+
+	if property == "exposed_headers" {
+		def = []string{}
+	} else {
+		def = []string{"*"}
+	}
+
+	if allowed, ok := cfg[property].([]interface{}); ok {
+		items := make([]string, len(allowed))
+
+		for idx, a := range allowed {
+			items[idx] = a.(string)
+		}
+
+		if len(items) == 0 {
+			return def
+		}
+
+		return items
+	}
+
+	return def
+}
+
+func readConfig(flags *pflag.FlagSet) *lib.Config {
+	cfg := &lib.Config{
+		User: &lib.User{
+			Scope:  getOpt(flags, "scope"),
+			Modify: getOptB(flags, "modify"),
+			Rules:  []*lib.Rule{},
+			Handler: &webdav.Handler{
+				Prefix:     getOpt(flags, "prefix"),
+				FileSystem: webdav.Dir(getOpt(flags, "scope")),
+				LockSystem: webdav.NewMemLS(),
+			},
+		},
+		Auth: getOptB(flags, "auth"),
+		Cors: lib.CorsCfg{
+			Enabled:     false,
+			Credentials: false,
+		},
+		Users: map[string]*lib.User{},
+	}
+
+	rawRules := v.Get("rules")
+	if rules, ok := rawRules.([]interface{}); ok {
+		cfg.User.Rules = parseRules(rules)
+	}
+
+	rawUsers := v.Get("users")
+	if users, ok := rawUsers.([]interface{}); ok {
+		parseUsers(users, cfg)
+	}
+
+	rawCors := v.Get("cors")
+	if cors, ok := rawCors.(map[string]interface{}); ok {
+		parseCors(cors, cfg)
+	}
+
+	if len(cfg.Users) != 0 && !cfg.Auth {
+		log.Print("Users will be ignored due to auth=false")
+	}
+
+	return cfg
+}

cmd/root.go

@@ -0,0 +1,100 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/spf13/cobra"
+	v "github.com/spf13/viper"
+)
+
+var (
+	cfgFile string
+)
+
+func init() {
+	cobra.OnInitialize(initConfig)
+
+	flags := rootCmd.Flags()
+	flags.StringVarP(&cfgFile, "config", "c", "", "config file path")
+	flags.BoolP("tls", "t", false, "enable tls")
+	flags.Bool("auth", true, "enable auth")
+	flags.String("cert", "cert.pem", "TLS certificate")
+	flags.String("key", "key.pem", "TLS key")
+	flags.StringP("address", "a", "0.0.0.0", "address to listen to")
+	flags.StringP("port", "p", "0", "port to listen to")
+	flags.StringP("prefix", "P", "/", "URL path prefix")
+}
+
+var rootCmd = &cobra.Command{
+	Use:   "webdav",
+	Short: "A simple to use WebDAV server",
+	Long: `If you don't set "config", it will look for a configuration file called
+config.{json, toml, yaml, yml} in the following directories:
+
+- ./
+- /etc/webdav/
+
+The precedence of the configuration values are as follows:
+
+- flags
+- environment variables
+- configuration file
+- defaults
+
+The environment variables are prefixed by "WD_" followed by the option
+name in caps. So to set "cert" via an env variable, you should
+set WD_CERT.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		flags := cmd.Flags()
+
+		cfg := readConfig(flags)
+
+		// Builds the address and a listener.
+		laddr := getOpt(flags, "address") + ":" + getOpt(flags, "port")
+		listener, err := net.Listen("tcp", laddr)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		// Tell the user the port in which is listening.
+		fmt.Println("Listening on", listener.Addr().String())
+
+		// Starts the server.
+		if getOptB(flags, "tls") {
+			if err := http.ServeTLS(listener, cfg, getOpt(flags, "cert"), getOpt(flags, "key")); err != nil {
+				log.Fatal(err)
+			}
+		} else {
+			if err := http.Serve(listener, cfg); err != nil {
+				log.Fatal(err)
+			}
+		}
+	},
+}
+
+func initConfig() {
+	if cfgFile == "" {
+		v.AddConfigPath(".")
+		v.AddConfigPath("/etc/webdav/")
+		v.SetConfigName("config")
+	} else {
+		v.SetConfigFile(cfgFile)
+	}
+
+	v.SetEnvPrefix("WD")
+	v.AutomaticEnv()
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+
+	if err := v.ReadInConfig(); err != nil {
+		if _, ok := err.(v.ConfigParseError); ok {
+			panic(err)
+		}
+		cfgFile = "No config file used"
+	} else {
+		cfgFile = "Using config file: " + v.ConfigFileUsed()
+	}
+}

cmd/version.go

@@ -0,0 +1,19 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var version = "(untracked)"
+
+func init() {
+	rootCmd.AddCommand(&cobra.Command{
+		Use:   "version",
+		Short: "Print the version number",
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Println("WebDAV version " + version)
+		},
+	})
+}

cmd/viper.go

@@ -0,0 +1,55 @@
+package cmd
+
+import (
+	"log"
+
+	"github.com/spf13/pflag"
+	v "github.com/spf13/viper"
+)
+
+// getOption returns a parameter as a string.
+//
+// NOTE: we could simply bind the flags to viper and use IsSet.
+// Although there is a bug on Viper that always returns true on IsSet
+// if a flag is binded. Our alternative way is to manually check
+// the flag and then the value from env/config/gotten by viper.
+// https://github.com/spf13/viper/pull/331
+func getOpt(flags *pflag.FlagSet, key string) string {
+	value, _ := flags.GetString(key)
+
+	// If set on Flags, use it.
+	if flags.Changed(key) {
+		return value
+	}
+
+	// If set through viper (env, config), return it.
+	if v.IsSet(key) {
+		return v.GetString(key)
+	}
+
+	// Otherwise use default value on flags.
+	return value
+}
+
+func getOptB(flags *pflag.FlagSet, key string) bool {
+	value, _ := flags.GetBool(key)
+
+	// If set on Flags, use it.
+	if flags.Changed(key) {
+		return value
+	}
+
+	// If set through viper (env, config), return it.
+	if v.IsSet(key) {
+		return v.GetBool(key)
+	}
+
+	// Otherwise use default value on flags.
+	return value
+}
+
+func checkErr(err error) {
+	if err != nil {
+		log.Fatal(err)
+	}
+}

cmd/webdav/main.go

@@ -1,299 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"flag"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"net"
-	"net/http"
-	"os"
-	"path/filepath"
-	"regexp"
-	"strings"
-
-	"github.com/hacdias/webdav"
-	"golang.org/x/crypto/bcrypt"
-	wd "golang.org/x/net/webdav"
-	yaml "gopkg.in/yaml.v2"
-)
-
-var (
-	config         string
-	defaultConfigs = []string{
-		"config.json",
-		"config.yaml",
-		"config.yml",
-		"/etc/webdav/config.json",
-		"/etc/webdav/config.yaml",
-		"/etc/webdav/config.yml",
-	}
-)
-
-func init() {
-	flag.StringVar(&config, "config", "", "Configuration file")
-}
-
-func parseRules(raw []map[string]interface{}) []*webdav.Rule {
-	rules := []*webdav.Rule{}
-
-	for _, r := range raw {
-		rule := &webdav.Rule{
-			Regex: false,
-			Allow: false,
-			Path:  "",
-		}
-
-		if regex, ok := r["regex"].(bool); ok {
-			rule.Regex = regex
-		}
-
-		if allow, ok := r["allow"].(bool); ok {
-			rule.Allow = allow
-		}
-
-		path, ok := r["rule"].(string)
-		if !ok {
-			continue
-		}
-
-		if rule.Regex {
-			rule.Regexp = regexp.MustCompile(path)
-		} else {
-			rule.Path = path
-		}
-
-		rules = append(rules, rule)
-	}
-
-	return rules
-}
-
-func parseUsers(raw []map[string]interface{}, c *cfg) {
-	for _, r := range raw {
-		username, ok := r["username"].(string)
-		if !ok {
-			log.Fatal("user needs an username")
-		}
-
-		// load username from environment when prefix {env} is added
-		if strings.HasPrefix(username, "{env}") {
-			var envUsername = strings.TrimPrefix(username, "{env}")
-			if envUsername == "" {
-				log.Fatal("no environment variable specified for username")
-			}
-			username = os.Getenv(envUsername)
-			if username == "" {
-				log.Fatal("username must be set in environment")
-			}
-		}
-
-		password, ok := r["password"].(string)
-		if !ok {
-			log.Fatal("user needs a password")
-		}
-
-		// load password from environment when prefix {env} is added
-		if strings.HasPrefix(password, "{env}") {
-			var envPassword = strings.TrimPrefix(password, "{env}")
-			if envPassword == "" {
-				log.Fatal("no environment variable specified for password")
-			}
-			password = os.Getenv(envPassword)
-			if password == "" {
-				log.Fatal("password must be set in environment")
-			}
-		}
-
-		c.auth[username] = password
-
-		user := &webdav.User{
-			Scope:  c.webdav.User.Scope,
-			Modify: c.webdav.User.Modify,
-			Rules:  c.webdav.User.Rules,
-		}
-
-		if scope, ok := r["scope"].(string); ok {
-			user.Scope = scope
-		}
-
-		if modify, ok := r["modify"].(bool); ok {
-			user.Modify = modify
-		}
-
-		if rules, ok := r["rules"].([]map[string]interface{}); ok {
-			user.Rules = parseRules(rules)
-		}
-
-		user.Handler = &wd.Handler{
-			FileSystem: wd.Dir(user.Scope),
-			LockSystem: wd.NewMemLS(),
-		}
-
-		c.webdav.Users[username] = user
-	}
-}
-
-func getConfig() []byte {
-	if config == "" {
-		for _, v := range defaultConfigs {
-			_, err := os.Stat(v)
-			if err == nil {
-				config = v
-				break
-			}
-		}
-	}
-
-	if config == "" {
-		log.Fatal("no config file specified; couldn't find any config.{yaml,json}")
-	}
-
-	file, err := ioutil.ReadFile(config)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	return file
-}
-
-type cfg struct {
-	webdav  *webdav.Config
-	address string
-	port    string
-	tls     bool
-	cert    string
-	key     string
-	auth    map[string]string
-}
-
-func parseConfig() *cfg {
-	file := getConfig()
-
-	data := struct {
-		Address string                   `json:"address" yaml:"address"`
-		Port    string                   `json:"port" yaml:"port"`
-		TLS     bool                     `json:"tls" yaml:"tls"`
-		Cert    string                   `json:"cert" yaml:"cert"`
-		Key     string                   `json:"key" yaml:"key"`
-		Scope   string                   `json:"scope" yaml:"scope"`
-		Modify  bool                     `json:"modify" yaml:"modify"`
-		Rules   []map[string]interface{} `json:"rules" yaml:"rules"`
-		Users   []map[string]interface{} `json:"users" yaml:"users"`
-	}{
-		Address: "0.0.0.0",
-		Port:    "0",
-		TLS:     false,
-		Cert:    "cert.pem",
-		Key:     "key.pem",
-		Scope:   "./",
-		Modify:  true,
-	}
-
-	var err error
-	if filepath.Ext(config) == ".json" {
-		err = json.Unmarshal(file, &data)
-	} else {
-		err = yaml.Unmarshal(file, &data)
-	}
-
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	config := &cfg{
-		address: data.Address,
-		port:    data.Port,
-		tls:     data.TLS,
-		cert:    data.Cert,
-		key:     data.Key,
-		auth:    map[string]string{},
-		webdav: &webdav.Config{
-			User: &webdav.User{
-				Scope:  data.Scope,
-				Modify: data.Modify,
-				Rules:  []*webdav.Rule{},
-				Handler: &wd.Handler{
-					FileSystem: wd.Dir(data.Scope),
-					LockSystem: wd.NewMemLS(),
-				},
-			},
-			Users: map[string]*webdav.User{},
-		},
-	}
-
-	if len(data.Users) == 0 {
-		log.Fatal("no user defined")
-	}
-
-	if len(data.Rules) != 0 {
-		config.webdav.User.Rules = parseRules(data.Rules)
-	}
-
-	parseUsers(data.Users, config)
-	return config
-}
-
-func basicAuth(c *cfg) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
-
-		username, password, authOK := r.BasicAuth()
-		if !authOK {
-			http.Error(w, "Not authorized", 401)
-			return
-		}
-
-		p, ok := c.auth[username]
-		if !ok {
-			http.Error(w, "Not authorized", 401)
-			return
-		}
-
-		if !checkPassword(p, password) {
-			log.Println("Wrong Password for user", username)
-			http.Error(w, "Not authorized", 401)
-			return
-		}
-
-		c.webdav.ServeHTTP(w, r)
-	})
-}
-
-func checkPassword(saved, input string) bool {
-	if strings.HasPrefix(saved, "{bcrypt}") {
-		savedPassword := strings.TrimPrefix(saved, "{bcrypt}")
-		return bcrypt.CompareHashAndPassword([]byte(savedPassword), []byte(input)) == nil
-	}
-
-	return saved == input
-}
-
-func main() {
-	flag.Parse()
-	cfg := parseConfig()
-	handler := basicAuth(cfg)
-
-	// Builds the address and a listener.
-	laddr := cfg.address + ":" + cfg.port
-	listener, err := net.Listen("tcp", laddr)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	// Tell the user the port in which is listening.
-	fmt.Println("Listening on", listener.Addr().String())
-
-	// Starts the server.
-	if cfg.tls {
-		if err := http.ServeTLS(listener, handler, cfg.cert, cfg.key); err != nil {
-			log.Fatal(err)
-		}
-	} else {
-		if err := http.Serve(listener, handler); err != nil {
-			log.Fatal(err)
-		}
-
-	}
-}

go.mod

@@ -1,11 +1,17 @@
-module github.com/hacdias/webdav
+module github.com/hacdias/webdav/v3
 
 go 1.12
 
 require (
-	github.com/kr/pretty v0.1.0 // indirect
-	golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529
-	golang.org/x/net v0.0.0-20190509222800-a4d6f7feada5
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
-	gopkg.in/yaml.v2 v2.2.2
+	github.com/pelletier/go-toml v1.6.0 // indirect
+	github.com/spf13/afero v1.2.2 // indirect
+	github.com/spf13/cobra v0.0.5
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.5.0
+	golang.org/x/crypto v0.0.0-20191108234033-bd318be0434a
+	golang.org/x/net v0.0.0-20191109021931-daa7c04131f5
+	golang.org/x/sys v0.0.0-20191105231009-c1f44814a5cd // indirect
+	golang.org/x/text v0.3.2 // indirect
+	gopkg.in/yaml.v2 v2.2.5 // indirect
 )

go.sum

@@ -1,20 +1,183 @@
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
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lib/user.go

@@ -0,0 +1,48 @@
+package lib
+
+import (
+	"regexp"
+	"strings"
+
+	"golang.org/x/net/webdav"
+)
+
+// Rule is a dissalow/allow rule.
+type Rule struct {
+	Regex  bool
+	Allow  bool
+	Path   string
+	Regexp *regexp.Regexp
+}
+
+// User contains the settings of each user.
+type User struct {
+	Username string
+	Password string
+	Scope    string
+	Modify   bool
+	Rules    []*Rule
+	Handler  *webdav.Handler
+}
+
+// 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
+}

lib/utils.go

@@ -0,0 +1,25 @@
+package lib
+
+import (
+	"strings"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+func checkPassword(saved, input string) bool {
+	if strings.HasPrefix(saved, "{bcrypt}") {
+		savedPassword := strings.TrimPrefix(saved, "{bcrypt}")
+		return bcrypt.CompareHashAndPassword([]byte(savedPassword), []byte(input)) == nil
+	}
+
+	return saved == input
+}
+
+func isAllowedHost(allowedHosts []string, origin string) bool {
+	for _, host := range allowedHosts {
+		if host == origin {
+			return true
+		}
+	}
+	return false
+}

lib/webdav.go

@@ -1,29 +1,103 @@
-package webdav
+package lib
 
 import (
 	"context"
+	"log"
 	"net/http"
-	"regexp"
 	"strings"
-
-	"golang.org/x/net/webdav"
 )
 
+// CorsCfg is the CORS config.
+type CorsCfg struct {
+	Enabled        bool
+	Credentials    bool
+	AllowedHeaders []string
+	AllowedHosts   []string
+	AllowedMethods []string
+	ExposedHeaders []string
+}
+
 // Config is the configuration of a WebDAV instance.
 type Config struct {
 	*User
+	Auth  bool
+	Cors  CorsCfg
 	Users map[string]*User
 }
 
 // ServeHTTP determines if the request is for this plugin, and if all prerequisites are met.
 func (c *Config) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	u := c.User
+	requestOrigin := r.Header.Get("Origin")
 
-	// Gets the correct user for this request.
-	username, _, ok := r.BasicAuth()
-	if ok {
-		if user, ok := c.Users[username]; ok {
-			u = user
+	// Add CORS headers before any operation so even on a 401 unauthorized status, CORS will work.
+	if c.Cors.Enabled && requestOrigin != "" {
+		headers := w.Header()
+
+		allowedHeaders := strings.Join(c.Cors.AllowedHeaders, ", ")
+		allowedMethods := strings.Join(c.Cors.AllowedMethods, ", ")
+		exposedHeaders := strings.Join(c.Cors.ExposedHeaders, ", ")
+
+		allowAllHosts := len(c.Cors.AllowedHosts) == 1 && c.Cors.AllowedHosts[0] == "*"
+		allowedHost := isAllowedHost(c.Cors.AllowedHosts, requestOrigin)
+
+		if allowAllHosts {
+			headers.Set("Access-Control-Allow-Origin", "*")
+		} else if allowedHost {
+			headers.Set("Access-Control-Allow-Origin", requestOrigin)
+		}
+
+		if allowAllHosts || allowedHost {
+			headers.Set("Access-Control-Allow-Headers", allowedHeaders)
+			headers.Set("Access-Control-Allow-Methods", allowedMethods)
+
+			if c.Cors.Credentials {
+				headers.Set("Access-Control-Allow-Credentials", "true")
+			}
+
+			if len(c.Cors.ExposedHeaders) > 0 {
+				headers.Set("Access-Control-Expose-Headers", exposedHeaders)
+			}
+		}
+	}
+
+	if r.Method == "OPTIONS" && c.Cors.Enabled && requestOrigin != "" {
+		return
+	}
+
+	// Authentication
+	if c.Auth {
+		w.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
+
+		// Gets the correct user for this request.
+		username, password, ok := r.BasicAuth()
+		if !ok {
+			http.Error(w, "Not authorized", 401)
+			return
+		}
+
+		user, ok := c.Users[username]
+		if !ok {
+			http.Error(w, "Not authorized", 401)
+			return
+		}
+
+		if !checkPassword(user.Password, password) {
+			log.Println("Wrong Password for user", username)
+			http.Error(w, "Not authorized", 401)
+			return
+		}
+
+		u = user
+	} else {
+		// Even if Auth is disabled, we might want to get
+		// the user from the Basic Auth header. Useful for Caddy
+		// plugin implementation.
+		username, _, ok := r.BasicAuth()
+		if ok {
+			if user, ok := c.Users[username]; ok {
+				u = user
+			}
 		}
 	}
 
@@ -68,44 +142,6 @@ func (c *Config) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	u.Handler.ServeHTTP(w, r)
 }
 
-// Rule is a dissalow/allow rule.
-type Rule struct {
-	Regex  bool
-	Allow  bool
-	Path   string
-	Regexp *regexp.Regexp
-}
-
-// User contains the settings of each user.
-type User struct {
-	Scope   string
-	Modify  bool
-	Rules   []*Rule
-	Handler *webdav.Handler
-}
-
-// 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
-}
-
 // responseWriterNoBody is a wrapper used to suprress the body of the response
 // to a request. Mainly used for HEAD requests.
 type responseWriterNoBody struct {

main.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"runtime"
+
+	"github.com/hacdias/webdav/v3/cmd"
+)
+
+func main() {
+	runtime.GOMAXPROCS(runtime.NumCPU())
+	cmd.Execute()
+}

readme.md

@@ -1,35 +0,0 @@
-# webdav
-
-[![Build](https://img.shields.io/travis/hacdias/webdav.svg?style=flat-square)](https://travis-ci.org/hacdias/webdav)
-[![Go Report Card](https://goreportcard.com/badge/github.com/hacdias/webdav?style=flat-square)](https://goreportcard.com/report/hacdias/webdav)
-
-```webdav``` is a simple tool that creates a WebDAV server for you. By default, it runs on a random free port and supports JSON and YAML configuration. Here is a simple YAML configuration example:
-
-```yaml
-scope: /path/to/files
-address: 0.0.0.0
-port: 8080
-tls: false
-cert: cert.pem
-key: key.pem
-users:
-  - username: admin
-    password: admin
-  - username: encrypted
-    password: "{bcrypt}$2y$10$zEP6oofmXFeHaeMfBNLnP.DO8m.H.Mwhd24/TOX2MWLxAExXi4qgi"
-  - username: "{env}ENV_USERNAME"
-    password: "{env}ENV_PASSWORD"
-  - username: basic
-    password: basic
-    modify:   false
-    rules:
-      - regex: false
-      - allow: false
-      - path: /some/file
-```
-
-You can specify the path to the configuration file using the `--config` flag. By default, it will search for a `config.{yaml,json}` file on your current working directory.
-
-An example of how to use this with `systemd` is on [webdav.service.example](/webdav.service.example).
-
-Download it [here](https://github.com/hacdias/webdav/releases).