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

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

.goreleaser.yml

@@ -22,6 +22,10 @@ build:
     - 386
     - arm
     - arm64
+    - mips
+    - mipsle
+    - mips64
+    - mips64le
   goarm:
     - 5
     - 6

README.md

@@ -20,12 +20,27 @@ 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
@@ -49,6 +64,13 @@ There are more ways to customize how you run WebDAV through flags and environmen
 
 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

@@ -9,4 +9,4 @@ func Execute() {
 	if err := rootCmd.Execute(); err != nil {
 		log.Fatal(err)
 	}
-}
+}

cmd/config.go

@@ -5,20 +5,21 @@ import (
 	"log"
 	"os"
 	"regexp"
+	"strconv"
 	"strings"
 
-	"github.com/hacdias/webdav/webdav"
+	"github.com/hacdias/webdav/v3/lib"
 	"github.com/spf13/pflag"
 	v "github.com/spf13/viper"
-	wd "golang.org/x/net/webdav"
+	"golang.org/x/net/webdav"
 )
 
-func parseRules(raw []interface{}) []*webdav.Rule {
-	rules := []*webdav.Rule{}
+func parseRules(raw []interface{}) []*lib.Rule {
+	rules := []*lib.Rule{}
 
 	for _, v := range raw {
 		if r, ok := v.(map[interface{}]interface{}); ok {
-			rule := &webdav.Rule{
+			rule := &lib.Rule{
 				Regex: false,
 				Allow: false,
 				Path:  "",
@@ -64,7 +65,7 @@ func loadFromEnv(v string) (string, error) {
 	return v, nil
 }
 
-func parseUsers(raw []interface{}, c *webdav.Config) {
+func parseUsers(raw []interface{}, c *lib.Config) {
 	var err error
 	for _, v := range raw {
 		if u, ok := v.(map[interface{}]interface{}); ok {
@@ -81,6 +82,10 @@ func parseUsers(raw []interface{}, c *webdav.Config) {
 			password, ok := u["password"].(string)
 			if !ok {
 				password = ""
+
+				if numPwd, ok := u["password"].(int); ok {
+					password = strconv.Itoa(numPwd)
+				}
 			}
 
 			if strings.HasPrefix(password, "{env}") {
@@ -88,7 +93,7 @@ func parseUsers(raw []interface{}, c *webdav.Config) {
 				checkErr(err)
 			}
 
-			user := &webdav.User{
+			user := &lib.User{
 				Username: username,
 				Password: password,
 				Scope:    c.User.Scope,
@@ -108,9 +113,10 @@ func parseUsers(raw []interface{}, c *webdav.Config) {
 				user.Rules = parseRules(rules)
 			}
 
-			user.Handler = &wd.Handler{
-				FileSystem: wd.Dir(user.Scope),
-				LockSystem: wd.NewMemLS(),
+			user.Handler = &webdav.Handler{
+				Prefix:     c.User.Handler.Prefix,
+				FileSystem: webdav.Dir(user.Scope),
+				LockSystem: webdav.NewMemLS(),
 			}
 
 			c.Users[username] = user
@@ -118,19 +124,64 @@ func parseUsers(raw []interface{}, c *webdav.Config) {
 	}
 }
 
-func readConfig(flags *pflag.FlagSet) *webdav.Config {
-	cfg := &webdav.Config{
-		User: &webdav.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:  []*webdav.Rule{},
-			Handler: &wd.Handler{
-				FileSystem: wd.Dir(getOpt(flags, "scope")),
-				LockSystem: wd.NewMemLS(),
+			Rules:  []*lib.Rule{},
+			Handler: &webdav.Handler{
+				Prefix:     getOpt(flags, "prefix"),
+				FileSystem: webdav.Dir(getOpt(flags, "scope")),
+				LockSystem: webdav.NewMemLS(),
 			},
 		},
-		Auth:  getOptB(flags, "auth"),
-		Users: map[string]*webdav.User{},
+		Auth: getOptB(flags, "auth"),
+		Cors: lib.CorsCfg{
+			Enabled:     false,
+			Credentials: false,
+		},
+		Users: map[string]*lib.User{},
 	}
 
 	rawRules := v.Get("rules")
@@ -143,6 +194,11 @@ func readConfig(flags *pflag.FlagSet) *webdav.Config {
 		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")
 	}

cmd/root.go

@@ -21,10 +21,12 @@ func init() {
 	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{

go.mod

@@ -1,13 +1,17 @@
-module github.com/hacdias/webdav
+module github.com/hacdias/webdav/v3
 
 go 1.12
 
 require (
-	github.com/BurntSushi/toml v0.3.1 // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/spf13/cobra v0.0.3
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.3.2
-	golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529
-	golang.org/x/net v0.0.0-20190509222800-a4d6f7feada5
+	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

@@ -1,55 +1,183 @@
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lib/user.go

@@ -1,4 +1,4 @@
-package webdav
+package lib
 
 import (
 	"regexp"

lib/utils.go

@@ -1,4 +1,4 @@
-package webdav
+package lib
 
 import (
 	"strings"
@@ -14,3 +14,12 @@ func checkPassword(saved, input string) bool {
 
 	return saved == input
 }
+
+func isAllowedHost(allowedHosts []string, origin string) bool {
+	for _, host := range allowedHosts {
+		if host == origin {
+			return true
+		}
+	}
+	return false
+}

lib/webdav.go

@@ -1,22 +1,71 @@
-package webdav
+package lib
 
 import (
 	"context"
 	"log"
 	"net/http"
+	"strings"
 )
 
+// 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")
 
+	// 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"`)
 
@@ -40,6 +89,16 @@ func (c *Config) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 
 		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
+			}
+		}
 	}
 
 	// Checks for user permissions relatively to this PATH.

main.go

@@ -3,7 +3,7 @@ package main
 import (
 	"runtime"
 
-	"github.com/hacdias/webdav/cmd"
+	"github.com/hacdias/webdav/v3/cmd"
 )
 
 func main() {