Parameters for password validation

Makefile

@@ -1,5 +1,5 @@
 REPO=npenkov/docker-ldap-passwd-webui
-VER=1.0
+VER=1.2
 
 .PHONY: all build push
 

README.md

@@ -16,6 +16,8 @@ docker run -d -p 8080:8080 --name ldap-passwd-webui \
     -e LPW_SSL_SKIP_VERIFY="true" \
     -e LPW_USER_DN="uid=%s,ou=people,dc=example,dc=org" \
     -e LPW_USER_BASE="ou=people,dc=example,dc=org" \
+    -e LPW_PATTERN='.{8,}' \
+    -e LPW_PATTERN_INFO="Password must be at least 8 characters long." \
     npenkov/docker-ldap-passwd-webui:latest
 ```
 

app/util.go

@@ -9,6 +9,14 @@ func getTitle() string {
 	return envStr("LPW_TITLE", "Change your password on example.org")
 }
 
+func getPattern() string {
+	return envStr("LPW_PATTERN", ".{8,}")
+}
+
+func getPatternInfo() string {
+	return envStr("LPW_PATTERN_INFO", "Password must be at least 8 characters long.")
+}
+
 func envStr(key, defaultValue string) string {
 	val := os.Getenv(key)
 	if val != "" {

app/web.go

@@ -43,9 +43,11 @@ func (h *RegexpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 type pageData struct {
-	Title    string
+	Title       string
-	Username string
+	Pattern     string
-	Alerts   map[string]string
+	PatternInfo string
+	Username    string
+	Alerts      map[string]string
 }
 
 // ServeAssets : Serves the static assets
@@ -55,7 +57,7 @@ func ServeAssets(w http.ResponseWriter, req *http.Request) {
 
 // ServeIndex : Serves index page on GET request
 func ServeIndex(w http.ResponseWriter, req *http.Request) {
-	p := &pageData{Title: getTitle()}
+	p := &pageData{Title: getTitle(), Pattern: getPattern(), PatternInfo: getPatternInfo()}
 	t, e := template.ParseFiles(path.Join("templates", "index.html"))
 	if e != nil {
 		log.Printf("Error parsing file %v\n", e)
@@ -76,23 +78,28 @@ func ChangePassword(w http.ResponseWriter, req *http.Request) {
 	alerts := map[string]string{}
 
 	if len(username) < 1 || username[0] == "" {
-		alerts["error"] = "Username not specified.<br/>"
+		alerts["error"] = "Username not specified."
 	} else {
 		un = username[0]
 	}
 	if len(oldPassword) < 1 || oldPassword[0] == "" {
-		alerts["error"] = alerts["error"] + "Old password not specified.<br/>"
+		alerts["error"] = alerts["error"] + "Old password not specified."
 	}
 	if len(newPassword) < 1 || newPassword[0] == "" {
-		alerts["error"] = alerts["error"] + "New password not specified.<br/>"
+		alerts["error"] = alerts["error"] + "New password not specified."
 	}
 	if len(confirmPassword) < 1 || confirmPassword[0] == "" {
-		alerts["error"] = alerts["error"] + "Confirmation password not specified.<br/>"
+		alerts["error"] = alerts["error"] + "Confirmation password not specified."
 	}
 
 	if len(confirmPassword) >= 1 && len(newPassword) >= 1 && strings.Compare(newPassword[0], confirmPassword[0]) != 0 {
-		alerts["error"] = alerts["error"] + "New and confirmation passwords does not match.<br/>"
+		alerts["error"] = alerts["error"] + "New and confirmation passwords does not match."
 	}
+
+	if m, _ := regexp.MatchString(getPattern(), newPassword[0]); !m {
+		alerts["error"] = alerts["error"] + fmt.Sprintf("%s", getPatternInfo())
+	}
+
 	if len(alerts) == 0 {
 		client := NewLDAPClient()
 		if err := client.ModifyPassword(un, oldPassword[0], newPassword[0]); err != nil {

templates/index.html

@@ -24,12 +24,12 @@
 
         <label for="new-password">New password</label>
         <input id="new-password" name="new-password" type="password"
-            pattern=".{8,}" x-moz-errormessage="Password must be at least 8 characters long." required>
+            pattern="{{.Pattern}}" x-moz-errormessage="{{.PatternInfo}}" required>
 
         <label for="confirm-password">Confirm new password</label>
         <input id="confirm-password" name="confirm-password" type="password"
-            pattern=".{8,}" x-moz-errormessage="Password must be at least 8 characters long." required>
+            pattern="{{.Pattern}}" x-moz-errormessage="{{.PatternInfo}}" required>
-
+        <p>{{.PatternInfo}}</p>
         <button type="submit">Update password</button>
       </form>