Add random password feature

internal/provider/resource_user.go

@@ -85,16 +85,25 @@ func resourceUser() *schema.Resource {
 func resourceUserCreate(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
 	c := meta.(*model.Client4)
 
+	email := d.Get("email").(string)
+	password := d.Get("password").(string)
+	isRandomPassword := false
+	if password == "-" {
+		isRandomPassword = true
+		password = genPassword(16, 2, 2, 6)
+	}
+
 	user := &model.User{
 		Username:    d.Get("username").(string),
-		Password:    d.Get("password").(string),
+		Password:    password,
 		AuthService: d.Get("auth_service").(string),
-		Email:       d.Get("email").(string),
+		Email:       email,
 		Nickname:    d.Get("nickname").(string),
 		FirstName:   d.Get("first_name").(string),
 		LastName:    d.Get("last_name").(string),
 		Locale:      d.Get("locale").(string),
 	}
+
 	if authData, ok := d.GetOk("auth_data"); ok {
 		ad := authData.(string)
 		user.AuthData = &ad
@@ -107,6 +116,12 @@ func resourceUserCreate(ctx context.Context, d *schema.ResourceData, meta interf
 	if err != nil {
 		return diag.Errorf("cannot create user: %v", fmtErr(resp, err))
 	}
+	if isRandomPassword {
+		resp, err = c.SendPasswordResetEmail(email)
+		if err != nil {
+			return diag.Errorf("cannot reset password for user: %v", fmtErr(resp, err))
+		}
+	}
 
 	d.SetId(user.Id)
 

internal/provider/utils.go

@@ -2,10 +2,15 @@ package provider
 
 import (
 	"fmt"
+	"math/rand"
+	"strings"
+	"time"
 
 	"github.com/mattermost/mattermost-server/v6/model"
 )
 
+var random *rand.Rand
+
 func fmtErr(resp *model.Response, err error) error {
 	if resp == nil {
 		return err
@@ -22,3 +27,49 @@ func expandStringMap(m map[string]interface{}) map[string]string {
 
 	return r
 }
+
+func init() {
+	random = rand.New(rand.NewSource(time.Now().UnixNano()))
+}
+
+var passwordChars = struct {
+	Lower    string
+	Upper    string
+	Digits   string
+	Specials string
+}{
+	"abcdefghijklmnopqrstuvwxyz",
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
+	"0123456789",
+	"!@#$%^&*()-+",
+}
+
+func genPassword(size, numSpecials, numDigits, numUpper int) string {
+	var password strings.Builder
+
+	for i := 0; i < numSpecials; i++ {
+		password.WriteString(
+			string(passwordChars.Specials[random.Intn(len(passwordChars.Specials))]),
+		)
+	}
+	for i := 0; i < numDigits; i++ {
+		password.WriteString(
+			string(passwordChars.Digits[random.Intn(len(passwordChars.Digits))]),
+		)
+	}
+	for i := 0; i < numUpper; i++ {
+		password.WriteString(
+			string(passwordChars.Upper[random.Intn(len(passwordChars.Upper))]),
+		)
+	}
+	for i := 0; i < size-numSpecials-numDigits-numUpper; i++ {
+		password.WriteString(
+			string(passwordChars.Lower[random.Intn(len(passwordChars.Lower))]),
+		)
+	}
+	runes := []rune(password.String())
+	random.Shuffle(len(runes), func(i, j int) {
+		runes[i], runes[j] = runes[j], runes[i]
+	})
+	return string(runes)
+}