@@ -97,7 +97,7 @@ dependencies {
|
|||||||
testImplementation("io.ktor:ktor-client-mock:$ktor_version")
|
testImplementation("io.ktor:ktor-client-mock:$ktor_version")
|
||||||
testImplementation("io.ktor:ktor-client-mock-jvm:$ktor_version")
|
testImplementation("io.ktor:ktor-client-mock-jvm:$ktor_version")
|
||||||
testImplementation("org.koin:koin-test:$koinVersion")
|
testImplementation("org.koin:koin-test:$koinVersion")
|
||||||
testImplementation("io.mockk:mockk:1.9")
|
testImplementation("io.mockk:mockk:1.9.3")
|
||||||
testImplementation("org.junit.jupiter:junit-jupiter:5.5.0")
|
testImplementation("org.junit.jupiter:junit-jupiter:5.5.0")
|
||||||
testImplementation("org.amshove.kluent:kluent:1.4")
|
testImplementation("org.amshove.kluent:kluent:1.4")
|
||||||
testImplementation("io.cucumber:cucumber-java8:$cucumber_version")
|
testImplementation("io.cucumber:cucumber-java8:$cucumber_version")
|
||||||
|
|||||||
@@ -8,30 +8,19 @@ import fr.postgresjson.entity.mutable.UuidEntityVersioning
|
|||||||
import java.util.*
|
import java.util.*
|
||||||
|
|
||||||
class Article(
|
class Article(
|
||||||
id: UUID = UUID.randomUUID(),
|
|
||||||
title: String,
|
|
||||||
anonymous: Boolean = true,
|
|
||||||
content: String,
|
|
||||||
description: String,
|
|
||||||
tags: List<String> = emptyList(),
|
|
||||||
override var draft: Boolean = false,
|
|
||||||
override var lastVersion: Boolean = false,
|
|
||||||
createdBy: CitizenBasic
|
|
||||||
) : ArticleFull,
|
|
||||||
ArticleBasic(id, title, anonymous, content, description, tags, createdBy),
|
|
||||||
Viewable by ViewableImp()
|
|
||||||
|
|
||||||
open class ArticleBasic(
|
|
||||||
id: UUID = UUID.randomUUID(),
|
id: UUID = UUID.randomUUID(),
|
||||||
title: String,
|
title: String,
|
||||||
override var anonymous: Boolean = true,
|
override var anonymous: Boolean = true,
|
||||||
override var content: String,
|
override var content: String,
|
||||||
override var description: String,
|
override var description: String,
|
||||||
override var tags: List<String> = emptyList(),
|
override var tags: List<String> = emptyList(),
|
||||||
|
draft: Boolean = false,
|
||||||
|
override var lastVersion: Boolean = false,
|
||||||
override val createdBy: CitizenBasic
|
override val createdBy: CitizenBasic
|
||||||
) : ArticleBasicI,
|
) : ArticleFull,
|
||||||
ArticleSimple(id, title, createdBy) {
|
ArticleAuthI<CitizenBasicI>,
|
||||||
|
ArticleSimple(id, title, createdBy, draft),
|
||||||
|
Viewable by ViewableImp() {
|
||||||
init {
|
init {
|
||||||
tags = tags.distinct()
|
tags = tags.distinct()
|
||||||
}
|
}
|
||||||
@@ -40,8 +29,10 @@ open class ArticleBasic(
|
|||||||
open class ArticleSimple(
|
open class ArticleSimple(
|
||||||
id: UUID = UUID.randomUUID(),
|
id: UUID = UUID.randomUUID(),
|
||||||
override var title: String,
|
override var title: String,
|
||||||
override val createdBy: CitizenBasic
|
override val createdBy: CitizenBasic,
|
||||||
|
override var draft: Boolean = false
|
||||||
) : ArticleSimpleI,
|
) : ArticleSimpleI,
|
||||||
|
ArticleAuthI<CitizenBasicI>,
|
||||||
ArticleRefVersioning(id),
|
ArticleRefVersioning(id),
|
||||||
EntityCreatedAt by EntityCreatedAtImp(),
|
EntityCreatedAt by EntityCreatedAtImp(),
|
||||||
EntityCreatedBy<CitizenBasicI> by EntityCreatedByImp(createdBy),
|
EntityCreatedBy<CitizenBasicI> by EntityCreatedByImp(createdBy),
|
||||||
@@ -85,3 +76,10 @@ interface ArticleFull :
|
|||||||
var draft: Boolean
|
var draft: Boolean
|
||||||
var lastVersion: Boolean
|
var lastVersion: Boolean
|
||||||
}
|
}
|
||||||
|
|
||||||
|
interface ArticleAuthI<U : CitizenWithUserI> :
|
||||||
|
ArticleI,
|
||||||
|
EntityCreatedBy<U>,
|
||||||
|
EntityDeletedAt {
|
||||||
|
var draft: Boolean
|
||||||
|
}
|
||||||
@@ -29,7 +29,7 @@ open class CitizenBasic(
|
|||||||
override var birthday: DateTime,
|
override var birthday: DateTime,
|
||||||
override var voteAnonymous: Boolean = true,
|
override var voteAnonymous: Boolean = true,
|
||||||
override var followAnonymous: Boolean = true,
|
override var followAnonymous: Boolean = true,
|
||||||
user: UserRef
|
override val user: User
|
||||||
) : CitizenBasicI,
|
) : CitizenBasicI,
|
||||||
CitizenSimple(id, name, user)
|
CitizenSimple(id, name, user)
|
||||||
|
|
||||||
|
|||||||
@@ -10,7 +10,7 @@ class User(
|
|||||||
id: UUID = UUID.randomUUID(),
|
id: UUID = UUID.randomUUID(),
|
||||||
username: String,
|
username: String,
|
||||||
blockedAt: DateTime? = null,
|
blockedAt: DateTime? = null,
|
||||||
override var plainPassword: String?,
|
override var plainPassword: String? = null,
|
||||||
override var roles: List<Roles> = emptyList()
|
override var roles: List<Roles> = emptyList()
|
||||||
) : UserFull, UserBasic(id, username, blockedAt),
|
) : UserFull, UserBasic(id, username, blockedAt),
|
||||||
EntityCreatedAt by EntityCreatedAtImp(),
|
EntityCreatedAt by EntityCreatedAtImp(),
|
||||||
|
|||||||
@@ -1,5 +1,7 @@
|
|||||||
package fr.dcproject.security.voter
|
package fr.dcproject.security.voter
|
||||||
|
|
||||||
|
import fr.dcproject.entity.ArticleAuthI
|
||||||
|
import fr.dcproject.entity.ArticleI
|
||||||
import fr.dcproject.entity.ArticleSimpleI
|
import fr.dcproject.entity.ArticleSimpleI
|
||||||
import fr.dcproject.entity.UserI
|
import fr.dcproject.entity.UserI
|
||||||
import io.ktor.application.ApplicationCall
|
import io.ktor.application.ApplicationCall
|
||||||
@@ -16,53 +18,52 @@ class ArticleVoter : Voter {
|
|||||||
|
|
||||||
override fun supports(action: ActionI, call: ApplicationCall, subject: Any?): Boolean {
|
override fun supports(action: ActionI, call: ApplicationCall, subject: Any?): Boolean {
|
||||||
return (action is Action || action is CommentVoter.Action || action is VoteVoter.Action)
|
return (action is Action || action is CommentVoter.Action || action is VoteVoter.Action)
|
||||||
.and(subject is List<*> || subject is ArticleSimpleI? || subject is VoteEntity<*> || subject is CommentEntity<*>)
|
.and(subject is ArticleI? || subject is VoteEntity<*> || subject is CommentEntity<*>)
|
||||||
}
|
}
|
||||||
|
|
||||||
override fun vote(action: ActionI, call: ApplicationCall, subject: Any?): Vote {
|
override fun vote(action: ActionI, call: ApplicationCall, subject: Any?): Vote {
|
||||||
val user = call.user
|
val user = call.user
|
||||||
if (action == Action.CREATE && user is UserI) {
|
if (action == Action.CREATE && user is UserI) return Vote.GRANTED
|
||||||
return Vote.GRANTED
|
if (action == Action.VIEW) return view(subject, user)
|
||||||
}
|
if (action == Action.DELETE) return delete(subject, user)
|
||||||
|
if (action == Action.UPDATE) return update(subject, user)
|
||||||
if (action == Action.VIEW) {
|
|
||||||
if (subject is ArticleSimpleI) {
|
|
||||||
return if (subject.isDeleted()) Vote.DENIED
|
|
||||||
else Vote.GRANTED
|
|
||||||
}
|
|
||||||
if (subject is List<*>) {
|
|
||||||
subject.forEach {
|
|
||||||
if (it !is ArticleSimpleI || it.isDeleted()) {
|
|
||||||
return Vote.DENIED
|
|
||||||
}
|
|
||||||
}
|
|
||||||
return Vote.GRANTED
|
|
||||||
}
|
|
||||||
return Vote.DENIED
|
|
||||||
}
|
|
||||||
|
|
||||||
if (action is CommentVoter.Action) return voteForComment(action)
|
if (action is CommentVoter.Action) return voteForComment(action)
|
||||||
if (action is VoteVoter.Action) return voteForVote(action, subject)
|
if (action is VoteVoter.Action) return voteForVote(action, subject)
|
||||||
|
if (action is Action) return Vote.DENIED
|
||||||
if (subject is ArticleSimpleI) {
|
|
||||||
if (action == Action.DELETE && user is UserI && subject.createdBy.user.id == user.id) {
|
|
||||||
return Vote.GRANTED
|
|
||||||
}
|
|
||||||
|
|
||||||
if (action == Action.UPDATE && user is UserI && subject.createdBy.user.id == user.id) {
|
|
||||||
return Vote.GRANTED
|
|
||||||
}
|
|
||||||
|
|
||||||
return Vote.DENIED
|
|
||||||
}
|
|
||||||
|
|
||||||
if (action is Action) {
|
|
||||||
return Vote.DENIED
|
|
||||||
}
|
|
||||||
|
|
||||||
return Vote.ABSTAIN
|
return Vote.ABSTAIN
|
||||||
}
|
}
|
||||||
|
|
||||||
|
private fun view(subject: Any?, user: UserI?): Vote {
|
||||||
|
checkClass(ArticleAuthI::class, subject)
|
||||||
|
if (subject is ArticleAuthI<*>) {
|
||||||
|
return if (subject.isDeleted()) Vote.DENIED
|
||||||
|
else if (subject.draft && (user == null || subject.createdBy.user.id != user.id)) Vote.DENIED
|
||||||
|
else Vote.GRANTED
|
||||||
|
}
|
||||||
|
return Vote.DENIED
|
||||||
|
}
|
||||||
|
|
||||||
|
private fun delete(subject: Any?, user: UserI?): Vote {
|
||||||
|
checkClass(ArticleAuthI::class, subject)
|
||||||
|
if (subject is ArticleAuthI<*>) {
|
||||||
|
if (user is UserI && subject.createdBy.user.id == user.id) {
|
||||||
|
return Vote.GRANTED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return Vote.DENIED
|
||||||
|
}
|
||||||
|
|
||||||
|
private fun update(subject: Any?, user: UserI?): Vote {
|
||||||
|
checkClass(ArticleAuthI::class, subject)
|
||||||
|
if (subject is ArticleAuthI<*>) {
|
||||||
|
if (user is UserI && subject.createdBy.user.id == user.id) {
|
||||||
|
return Vote.GRANTED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return Vote.DENIED
|
||||||
|
}
|
||||||
|
|
||||||
private fun voteForVote(action: VoteVoter.Action, subject: Any?): Vote {
|
private fun voteForVote(action: VoteVoter.Action, subject: Any?): Vote {
|
||||||
if (action == VoteVoter.Action.CREATE && subject is VoteEntity<*>) {
|
if (action == VoteVoter.Action.CREATE && subject is VoteEntity<*>) {
|
||||||
val target = subject.target
|
val target = subject.target
|
||||||
|
|||||||
@@ -14,7 +14,7 @@ begin
|
|||||||
from (
|
from (
|
||||||
select
|
select
|
||||||
z.*,
|
z.*,
|
||||||
json_build_object('id', z.user_id) as "user"
|
find_user_by_id(z.user_id) as "user"
|
||||||
from citizen as z
|
from citizen as z
|
||||||
where "search" is null or (
|
where "search" is null or (
|
||||||
(name->'first_name')::text ilike '%'||"search"||'%' or
|
(name->'first_name')::text ilike '%'||"search"||'%' or
|
||||||
|
|||||||
@@ -21,37 +21,57 @@ class ArticleTest {
|
|||||||
@Language("JSON")
|
@Language("JSON")
|
||||||
private val articleJson: String = """
|
private val articleJson: String = """
|
||||||
{
|
{
|
||||||
"id" : "83b0b60a-5ab3-44f2-b243-1dc469a7564f",
|
"id": "83b0b60a-5ab3-44f2-b243-1dc469a7564f",
|
||||||
"version_id" : "fff2311c-07cc-43a6-bab1-aec6b649a903",
|
"title": "Hello world!",
|
||||||
"version_number" : null,
|
"anonymous": true,
|
||||||
"title" : "Hello world!",
|
"content": "bla bla bla",
|
||||||
"anonymous" : true,
|
"description": "this is the changement !",
|
||||||
"content" : "bla bla bla",
|
"tags": [],
|
||||||
"description" : "this is the changement !",
|
"draft": false,
|
||||||
"tags" : [ ],
|
"last_version": false,
|
||||||
"created_by" : {
|
"created_by": {
|
||||||
"id" : "3fff09e4-5ff2-46ee-9fd2-3803a1ffb600",
|
"id": "94a0d350-7eab-4a6e-9f84-0c2e7635b67c",
|
||||||
"name" : {
|
"name": {
|
||||||
"first_name" : "Jaque",
|
"first_name": "Jaque",
|
||||||
"last_name" : "Bono",
|
"last_name": "Bono",
|
||||||
"civility" : null
|
"civility": null
|
||||||
},
|
|
||||||
"birthday" : "2019-08-03T13:43:13.765Z",
|
|
||||||
"user_id" : null,
|
|
||||||
"vote_anonymous" : null,
|
|
||||||
"follow_anonymous" : null,
|
|
||||||
"user" : {
|
|
||||||
"id" : "151ec430-3aad-4792-9a14-e394b2be491b",
|
|
||||||
"username" : "jaque",
|
|
||||||
"blocked_at" : null,
|
|
||||||
"plain_password" : "azerty",
|
|
||||||
"created_at" : null,
|
|
||||||
"updated_at" : null
|
|
||||||
},
|
},
|
||||||
"email": "jaque.bono@gmail.com",
|
"email": "jaque.bono@gmail.com",
|
||||||
"created_at" : null
|
"birthday": "2020-03-16T01:48:27.020Z",
|
||||||
|
"vote_anonymous": true,
|
||||||
|
"follow_anonymous": true,
|
||||||
|
"user": {
|
||||||
|
"id": "2bc356a2-4d3e-46ff-91f4-ae30fb7fa67d",
|
||||||
|
"username": "jaque",
|
||||||
|
"blocked_at": null,
|
||||||
|
"plain_password": "azerty",
|
||||||
|
"roles": [],
|
||||||
|
"created_at": "2020-03-16T01:48:24.153Z",
|
||||||
|
"updated_at": "2020-03-16T01:48:24.516Z"
|
||||||
},
|
},
|
||||||
"created_at" : null
|
"deleted_at": null,
|
||||||
|
"deleted": false
|
||||||
|
},
|
||||||
|
"reference": "article",
|
||||||
|
"views": {
|
||||||
|
"total": 0,
|
||||||
|
"unique": 0,
|
||||||
|
"updated_at": "2020-03-16T01:48:31.070Z"
|
||||||
|
},
|
||||||
|
"version_id": "27cb4f5d-d425-4e10-95ca-6c50fac73408",
|
||||||
|
"version_number": null,
|
||||||
|
"created_at": "2020-03-16T01:48:31.004Z",
|
||||||
|
"deleted_at": null,
|
||||||
|
"deleted": false,
|
||||||
|
"votes": {
|
||||||
|
"up": 0,
|
||||||
|
"neutral": 0,
|
||||||
|
"down": 0,
|
||||||
|
"total": 0,
|
||||||
|
"score": 0,
|
||||||
|
"updated_at": null
|
||||||
|
},
|
||||||
|
"opinions": {}
|
||||||
}
|
}
|
||||||
""".trimIndent()
|
""".trimIndent()
|
||||||
|
|
||||||
|
|||||||
165
src/test/kotlin/fr/dcproject/security/voter/ArticleVoterTest.kt
Normal file
165
src/test/kotlin/fr/dcproject/security/voter/ArticleVoterTest.kt
Normal file
@@ -0,0 +1,165 @@
|
|||||||
|
package fr.dcproject.security.voter
|
||||||
|
|
||||||
|
import fr.dcproject.entity.*
|
||||||
|
import io.ktor.application.ApplicationCall
|
||||||
|
import io.mockk.every
|
||||||
|
import io.mockk.mockk
|
||||||
|
import io.mockk.mockkStatic
|
||||||
|
import org.amshove.kluent.`should be`
|
||||||
|
import org.joda.time.DateTime
|
||||||
|
import org.junit.jupiter.api.Test
|
||||||
|
import org.junit.jupiter.api.TestInstance
|
||||||
|
|
||||||
|
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
|
||||||
|
internal class ArticleVoterTest {
|
||||||
|
val tesla = CitizenBasic(
|
||||||
|
user = User(
|
||||||
|
username = "nicolas-tesla",
|
||||||
|
roles = listOf(UserI.Roles.ROLE_USER)
|
||||||
|
),
|
||||||
|
birthday = DateTime.now(),
|
||||||
|
email = "tesla@best.com",
|
||||||
|
name = CitizenI.Name("Nicolas", "Tesla")
|
||||||
|
)
|
||||||
|
val einstein = CitizenBasic(
|
||||||
|
user = User(
|
||||||
|
username = "albert-einstein",
|
||||||
|
roles = listOf(UserI.Roles.ROLE_USER)
|
||||||
|
),
|
||||||
|
birthday = DateTime.now(),
|
||||||
|
email = "einstein@best.com",
|
||||||
|
name = CitizenI.Name("Albert", "Einstein")
|
||||||
|
)
|
||||||
|
|
||||||
|
init {
|
||||||
|
mockkStatic("fr.dcproject.security.voter.VoterKt")
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `creator can be view the article`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla).apply { draft = true }
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns tesla.user
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.VIEW, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.VIEW, it, article) `should be` Vote.GRANTED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `other user can be view the article`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla)
|
||||||
|
val article2 = getArticle(tesla)
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns einstein.user
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.VIEW, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.VIEW, it, article) `should be` Vote.GRANTED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `other user can be view the article list`() = listOf(ArticleVoter()).run {
|
||||||
|
val article = getArticle(tesla)
|
||||||
|
val article2 = getArticle(tesla)
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns einstein.user
|
||||||
|
}.let {
|
||||||
|
can(ArticleVoter.Action.VIEW, it, listOf(article, article2)) `should be` true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `the no creator can not be view the article on draft`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla).apply { draft = true }
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns einstein.user
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.VIEW, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.VIEW, it, article) `should be` Vote.DENIED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `the no creator can not be view list of articles if one is on draft`() = listOf(ArticleVoter()).run {
|
||||||
|
val article = getArticle(tesla)
|
||||||
|
val article2 = getArticle(tesla).apply { draft = true }
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns einstein.user
|
||||||
|
}.let {
|
||||||
|
can(ArticleVoter.Action.VIEW, it, listOf(article, article2)) `should be` false
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `can not view deleted article`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla).apply { deletedAt = DateTime.now() }
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns tesla.user
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.VIEW, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.VIEW, it, article) `should be` Vote.DENIED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `can delete article if owner`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla)
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns tesla.user
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.DELETE, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.DELETE, it, article) `should be` Vote.GRANTED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `can not delete article if not owner`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla).apply { deletedAt = DateTime.now() }
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns einstein.user
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.DELETE, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.DELETE, it, article) `should be` Vote.DENIED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `can create article if logged`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla)
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns tesla.user
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.CREATE, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.CREATE, it, article) `should be` Vote.GRANTED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
fun `can not create article if not logged`() = ArticleVoter().run {
|
||||||
|
val article = getArticle(tesla)
|
||||||
|
|
||||||
|
mockk<ApplicationCall> {
|
||||||
|
every { user } returns null
|
||||||
|
}.let {
|
||||||
|
supports(ArticleVoter.Action.CREATE, it, article) `should be` true
|
||||||
|
vote(ArticleVoter.Action.CREATE, it, article) `should be` Vote.DENIED
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private fun getArticle(createdBy: CitizenBasic = tesla) = Article(
|
||||||
|
title = "Hello world",
|
||||||
|
content = "Super",
|
||||||
|
description = "I Rocks",
|
||||||
|
createdBy = createdBy
|
||||||
|
)
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user