src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerService.kt

@@ -31,6 +31,7 @@ import kr.co.vividnext.sodalive.member.Member
 import kr.co.vividnext.sodalive.member.MemberRole
 import kr.co.vividnext.sodalive.member.MemberService
 import kr.co.vividnext.sodalive.member.contentpreference.MemberContentPreferenceService
+import kr.co.vividnext.sodalive.v2.api.creator.channel.fantalk.dto.CreatorChannelFanTalkResponse
 import org.springframework.beans.factory.annotation.Value
 import org.springframework.context.ApplicationEventPublisher
 import org.springframework.data.domain.Pageable
@@ -579,7 +580,7 @@ class ExplorerService(
     }
 
     @Transactional
-    fun writeCheers(request: PostWriteCheersRequest, member: Member) {
+    fun writeCheers(request: PostWriteCheersRequest, member: Member): CreatorChannelFanTalkResponse {
         val creator = queryRepository.getMember(request.creatorId)
             ?: throw SodaException(messageKey = "member.validation.user_not_found")
 
@@ -605,18 +606,20 @@ class ExplorerService(
             cheers.parent = parent
         }
 
-        cheersRepository.save(cheers)
+        val savedCheers = cheersRepository.save(cheers)
 
         // 언어 코드가 지정되지 않은 경우, 파파고 언어 감지 API를 통해 비동기로 언어를 식별한다.
         if (request.languageCode.isNullOrBlank()) {
             applicationEventPublisher.publishEvent(
                 LanguageDetectEvent(
-                    id = cheers.id!!,
+                    id = savedCheers.id!!,
                     query = request.content,
                     targetType = LanguageDetectTargetType.CREATOR_CHEERS
                 )
             )
         }
+
+        return CreatorChannelFanTalkResponse.from(savedCheers, cloudFrontHost)
     }
 
     fun getCreatorProfileCheers(
@@ -639,24 +642,29 @@ class ExplorerService(
     }
 
     @Transactional
-    fun modifyCheers(request: PutWriteCheersRequest, member: Member) {
+    fun modifyCheers(request: PutWriteCheersRequest, member: Member): CreatorChannelFanTalkResponse {
         val cheers = queryRepository.getCheers(request.cheersId)
             ?: throw SodaException(messageKey = "common.error.invalid_request")
+        val isWriter = cheers.member!!.id!! == member.id!!
+        val isCreator = cheers.creator!!.id!! == member.id!!
 
-        if (cheers.member!!.id!! == member.id!!) {
+        if (!isWriter && !isCreator) {
+            throw SodaException(messageKey = "common.error.invalid_request")
+        }
+
+        if (isWriter) {
             if (request.content != null) {
                 cheers.cheers = request.content
             }
         }
 
-        if (
-            cheers.creator!!.id!! == member.id!! ||
-            cheers.member!!.id!! == member.id!!
-        ) {
+        if (isCreator || isWriter) {
             if (request.isActive != null) {
                 cheers.isActive = request.isActive
             }
         }
+
+        return CreatorChannelFanTalkResponse.from(cheers, cloudFrontHost)
     }
 
     @Transactional

src/main/kotlin/kr/co/vividnext/sodalive/v2/api/creator/channel/fantalk/dto/CreatorChannelFanTalkTabResponse.kt

@@ -1,7 +1,10 @@
 package kr.co.vividnext.sodalive.v2.api.creator.channel.fantalk.dto
 
 import com.fasterxml.jackson.annotation.JsonProperty
+import kr.co.vividnext.sodalive.explorer.profile.CreatorCheers
+import kr.co.vividnext.sodalive.extensions.removeDeletedNicknamePrefix
 import kr.co.vividnext.sodalive.extensions.toUtcIso
+import kr.co.vividnext.sodalive.v2.common.domain.toCdnUrl
 import kr.co.vividnext.sodalive.v2.creator.channel.fantalk.domain.CreatorChannelFanTalk
 import kr.co.vividnext.sodalive.v2.creator.channel.fantalk.domain.CreatorChannelFanTalkReply
 import kr.co.vividnext.sodalive.v2.creator.channel.fantalk.domain.CreatorChannelFanTalkTab
@@ -48,6 +51,20 @@ data class CreatorChannelFanTalkResponse(
                 creatorReplies = fanTalk.creatorReplies.map(CreatorChannelFanTalkReplyResponse::from)
             )
         }
+
+        fun from(fanTalk: CreatorCheers, cloudFrontHost: String): CreatorChannelFanTalkResponse {
+            val writer = fanTalk.member!!
+            return CreatorChannelFanTalkResponse(
+                fanTalkId = fanTalk.id!!,
+                writerId = writer.id!!,
+                writerNickname = writer.nickname.removeDeletedNicknamePrefix(),
+                writerProfileImageUrl = writer.profileImage.toCdnUrl(cloudFrontHost)
+                    ?: "$cloudFrontHost/profile/default-profile.png",
+                content = fanTalk.cheers,
+                createdAtUtc = fanTalk.createdAt!!.toUtcIso(),
+                creatorReplies = emptyList()
+            )
+        }
     }
 }
 

src/test/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerControllerTest.kt

@@ -0,0 +1,141 @@
+package kr.co.vividnext.sodalive.explorer
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import kr.co.vividnext.sodalive.common.CountryContext
+import kr.co.vividnext.sodalive.explorer.profile.PostWriteCheersRequest
+import kr.co.vividnext.sodalive.explorer.profile.PutWriteCheersRequest
+import kr.co.vividnext.sodalive.i18n.LangContext
+import kr.co.vividnext.sodalive.i18n.SodaMessageSource
+import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberAdapter
+import kr.co.vividnext.sodalive.member.MemberRole
+import kr.co.vividnext.sodalive.v2.api.creator.channel.fantalk.dto.CreatorChannelFanTalkResponse
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.mockito.Mockito
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest
+import org.springframework.boot.test.context.TestConfiguration
+import org.springframework.boot.test.mock.mockito.MockBean
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Import
+import org.springframework.http.HttpStatus
+import org.springframework.http.MediaType
+import org.springframework.security.config.annotation.web.builders.HttpSecurity
+import org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.user
+import org.springframework.security.web.SecurityFilterChain
+import org.springframework.security.web.authentication.HttpStatusEntryPoint
+import org.springframework.test.web.servlet.MockMvc
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath
+import org.springframework.test.web.servlet.result.MockMvcResultMatchers.status
+import javax.servlet.http.HttpServletResponse
+
+@WebMvcTest(ExplorerController::class)
+@Import(ExplorerControllerTest.TestSecurityConfig::class)
+class ExplorerControllerTest @Autowired constructor(
+    private val mockMvc: MockMvc,
+    private val objectMapper: ObjectMapper
+) {
+    @MockBean
+    private lateinit var service: ExplorerService
+
+    @MockBean
+    private lateinit var messageSource: SodaMessageSource
+
+    @MockBean
+    private lateinit var langContext: LangContext
+
+    @MockBean
+    private lateinit var countryContext: CountryContext
+
+    @TestConfiguration
+    class TestSecurityConfig {
+        @Bean
+        fun securityFilterChain(http: HttpSecurity): SecurityFilterChain {
+            return http
+                .csrf().disable()
+                .authorizeRequests()
+                .anyRequest().authenticated()
+                .and()
+                .exceptionHandling()
+                .authenticationEntryPoint(HttpStatusEntryPoint(HttpStatus.UNAUTHORIZED))
+                .accessDeniedHandler { _, response, _ -> response.sendError(HttpServletResponse.SC_FORBIDDEN) }
+                .and()
+                .build()
+        }
+    }
+
+    @Test
+    @DisplayName("팬톡 작성 API는 저장된 팬톡 데이터를 data에 반환한다")
+    fun shouldReturnCreatedFanTalkData() {
+        val member = createMember(id = 10L)
+        val request = PostWriteCheersRequest(creatorId = 1L, content = "created fan talk", languageCode = "ko")
+        Mockito.doReturn(createFanTalkResponse(content = "created fan talk"))
+            .`when`(service).writeCheers(eqValue(request), eqValue(member))
+
+        mockMvc.perform(
+            post("/explorer/profile/cheers")
+                .contentType(MediaType.APPLICATION_JSON)
+                .content(objectMapper.writeValueAsString(request))
+                .with(user(MemberAdapter(member)))
+        )
+            .andExpect(status().isOk)
+            .andExpect(jsonPath("$.success").value(true))
+            .andExpect(jsonPath("$.data.fanTalkId").value(101))
+            .andExpect(jsonPath("$.data.writerId").value(10))
+            .andExpect(jsonPath("$.data.writerNickname").value("fan"))
+            .andExpect(jsonPath("$.data.writerProfileImageUrl").value("https://cdn.test/profile/fan.png"))
+            .andExpect(jsonPath("$.data.content").value("created fan talk"))
+            .andExpect(jsonPath("$.data.createdAtUtc").value("2026-07-09T01:00:00Z"))
+            .andExpect(jsonPath("$.data.creatorReplies").isArray)
+            .andExpect(jsonPath("$.data.creatorReplies.length()").value(0))
+    }
+
+    @Test
+    @DisplayName("팬톡 수정 API는 수정된 팬톡 데이터를 data에 반환한다")
+    fun shouldReturnModifiedFanTalkData() {
+        val member = createMember(id = 10L)
+        val request = PutWriteCheersRequest(cheersId = 101L, content = "modified fan talk")
+        Mockito.doReturn(createFanTalkResponse(content = "modified fan talk"))
+            .`when`(service).modifyCheers(eqValue(request), eqValue(member))
+
+        mockMvc.perform(
+            put("/explorer/profile/cheers")
+                .contentType(MediaType.APPLICATION_JSON)
+                .content(objectMapper.writeValueAsString(request))
+                .with(user(MemberAdapter(member)))
+        )
+            .andExpect(status().isOk)
+            .andExpect(jsonPath("$.success").value(true))
+            .andExpect(jsonPath("$.data.fanTalkId").value(101))
+            .andExpect(jsonPath("$.data.content").value("modified fan talk"))
+            .andExpect(jsonPath("$.data.creatorReplies.length()").value(0))
+    }
+
+    private fun createMember(id: Long): Member {
+        return Member(
+            email = "user$id@test.com",
+            password = "password",
+            nickname = "user$id",
+            role = MemberRole.USER
+        ).apply { this.id = id }
+    }
+
+    private fun createFanTalkResponse(content: String): CreatorChannelFanTalkResponse {
+        return CreatorChannelFanTalkResponse(
+            fanTalkId = 101L,
+            writerId = 10L,
+            writerNickname = "fan",
+            writerProfileImageUrl = "https://cdn.test/profile/fan.png",
+            content = content,
+            createdAtUtc = "2026-07-09T01:00:00Z",
+            creatorReplies = emptyList()
+        )
+    }
+
+    private fun <T> eqValue(value: T): T {
+        return Mockito.eq(value) ?: value
+    }
+}

src/test/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerServiceTest.kt

@@ -0,0 +1,86 @@
+package kr.co.vividnext.sodalive.explorer
+
+import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.content.AudioContentService
+import kr.co.vividnext.sodalive.content.series.ContentSeriesService
+import kr.co.vividnext.sodalive.content.translation.ContentTranslationRepository
+import kr.co.vividnext.sodalive.explorer.profile.ChannelNoticeRepository
+import kr.co.vividnext.sodalive.explorer.profile.CreatorCheers
+import kr.co.vividnext.sodalive.explorer.profile.CreatorCheersRepository
+import kr.co.vividnext.sodalive.explorer.profile.CreatorDonationRankingService
+import kr.co.vividnext.sodalive.explorer.profile.PutWriteCheersRequest
+import kr.co.vividnext.sodalive.explorer.profile.channelDonation.ChannelDonationService
+import kr.co.vividnext.sodalive.explorer.profile.creatorCommunity.CreatorCommunityService
+import kr.co.vividnext.sodalive.i18n.LangContext
+import kr.co.vividnext.sodalive.i18n.SodaMessageSource
+import kr.co.vividnext.sodalive.member.Member
+import kr.co.vividnext.sodalive.member.MemberRole
+import kr.co.vividnext.sodalive.member.MemberService
+import kr.co.vividnext.sodalive.member.contentpreference.MemberContentPreferenceService
+import org.junit.jupiter.api.Assertions.assertThrows
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.mockito.Mockito
+import org.springframework.context.ApplicationEventPublisher
+import java.time.LocalDateTime
+
+class ExplorerServiceTest {
+    @Test
+    @DisplayName("팬톡 수정은 작성자나 크리에이터가 아닌 요청자에게 데이터를 반환하지 않는다")
+    fun shouldRejectModifyCheersForNonWriterAndNonCreator() {
+        val queryRepository = Mockito.mock(ExplorerQueryRepository::class.java)
+        val service = createService(queryRepository)
+        val cheers = createCheers(
+            writer = createMember(id = 10L, nickname = "writer"),
+            creator = createMember(id = 20L, nickname = "creator", role = MemberRole.CREATOR)
+        )
+        val requester = createMember(id = 30L, nickname = "requester")
+        Mockito.doReturn(cheers).`when`(queryRepository).getCheers(101L)
+
+        assertThrows(SodaException::class.java) {
+            service.modifyCheers(PutWriteCheersRequest(cheersId = 101L, content = "stolen"), requester)
+        }
+    }
+
+    private fun createService(queryRepository: ExplorerQueryRepository): ExplorerService {
+        return ExplorerService(
+            memberService = Mockito.mock(MemberService::class.java),
+            memberContentPreferenceService = Mockito.mock(MemberContentPreferenceService::class.java),
+            audioContentService = Mockito.mock(AudioContentService::class.java),
+            donationRankingService = Mockito.mock(CreatorDonationRankingService::class.java),
+            queryRepository = queryRepository,
+            cheersRepository = Mockito.mock(CreatorCheersRepository::class.java),
+            noticeRepository = Mockito.mock(ChannelNoticeRepository::class.java),
+            channelDonationService = Mockito.mock(ChannelDonationService::class.java),
+            communityService = Mockito.mock(CreatorCommunityService::class.java),
+            seriesService = Mockito.mock(ContentSeriesService::class.java),
+            applicationEventPublisher = Mockito.mock(ApplicationEventPublisher::class.java),
+            contentTranslationRepository = Mockito.mock(ContentTranslationRepository::class.java),
+            messageSource = Mockito.mock(SodaMessageSource::class.java),
+            langContext = Mockito.mock(LangContext::class.java),
+            cloudFrontHost = "https://cdn.test"
+        )
+    }
+
+    private fun createCheers(writer: Member, creator: Member): CreatorCheers {
+        return CreatorCheers(cheers = "fan talk", languageCode = "ko").apply {
+            id = 101L
+            member = writer
+            this.creator = creator
+            createdAt = LocalDateTime.of(2026, 7, 9, 1, 0)
+        }
+    }
+
+    private fun createMember(
+        id: Long,
+        nickname: String,
+        role: MemberRole = MemberRole.USER
+    ): Member {
+        return Member(
+            email = "$nickname@test.com",
+            password = "password",
+            nickname = nickname,
+            role = role
+        ).apply { this.id = id }
+    }
+}