feat(hls): auto-publish kind:1 sibling note with rich imeta

2026-05-09 21:30:49 +02:00
parent 7550e82283
commit 48d08f5895
9 changed files with 204 additions and 123 deletions
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.service.uploads.hls
+
+import com.davotoula.lightcompressor.hls.HlsContentTypes
+import com.vitorpamplona.quartz.nip01Core.signers.EventTemplate
+import com.vitorpamplona.quartz.nip01Core.tags.references.reference
+import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
+import com.vitorpamplona.quartz.nip71Video.blurhash
+import com.vitorpamplona.quartz.nip71Video.dims
+import com.vitorpamplona.quartz.nip71Video.hash
+import com.vitorpamplona.quartz.nip71Video.image
+import com.vitorpamplona.quartz.nip71Video.mimeType
+import com.vitorpamplona.quartz.nip71Video.thumbhash
+import com.vitorpamplona.quartz.nip92IMeta.imeta
+import com.vitorpamplona.quartz.nip92IMeta.imetaTagBuilder
+import com.vitorpamplona.quartz.nip94FileMetadata.tags.DimensionTag
+import com.vitorpamplona.quartz.utils.TimeUtils
+
+/**
+ * Builds the kind:1 short-note that's published as a sibling of the NIP-71 video event from
+ * Amethyst's HLS publish flow. Receivers that don't speak NIP-71 can still render a rich
+ * preview (poster + dim + blurhash/thumbhash) from the kind:1 alone, while NIP-71-aware
+ * receivers can hop to the addressable form via the `a` tag.
+ *
+ * Tag layout:
+ * - One `imeta` mirroring the master rendition (url=master m3u8, m=hls, x=master sha256,
+ *   dim=master dim, image=poster, blurhash, thumbhash).
+ * - One `r` tag with the master m3u8 URL (idiomatic kind:1 reference).
+ *
+ * Content mirrors the previous "Draft note" layout: `title\n\ndescription\n\nmasterUrl`,
+ * blank fields skipped.
+ *
+ * Intentionally omits an `a` tag back-reference to the NIP-71 event: in practice Amethyst's
+ * note renderer prefers the embedded addressable form when an `a` tag is present, and falls
+ * back to a placeholder if the relay set hasn't returned it yet — masking the rich imeta we
+ * just added. Without `a`, the kind:1 renders as a vanilla rich-imeta video note across
+ * clients, which is what users expect from a shared video link.
+ */
+object HlsKind1SiblingBuilder {
+    fun build(
+        title: String,
+        description: String,
+        masterUrl: String,
+        masterSha256: String?,
+        masterDimension: DimensionTag?,
+        posterUrl: String?,
+        blurhashValue: String?,
+        thumbhashValue: String?,
+        createdAt: Long? = null,
+    ): EventTemplate<TextNoteEvent> {
+        val content =
+            listOf(title, description, masterUrl)
+                .map { it.trim() }
+                .filter { it.isNotEmpty() }
+                .joinToString("\n\n")
+
+        val masterImeta =
+            imetaTagBuilder(masterUrl) {
+                mimeType(HlsContentTypes.HLS_PLAYLIST)
+                masterSha256?.let { hash(it) }
+                masterDimension?.let { dims(it) }
+                posterUrl?.let { image(it) }
+                blurhashValue?.let { blurhash(it) }
+                thumbhashValue?.let { thumbhash(it) }
+            }
+
+        return TextNoteEvent.build(content, createdAt ?: TimeUtils.now()) {
+            imeta(masterImeta)
+            reference(masterUrl)
+        }
+    }
+}
@@ -71,6 +71,20 @@ sealed class HlsVideoEventTemplate {
    ) : HlsVideoEventTemplate()
 }

+/**
+ * Result of [HlsVideoEventBuilder.build]. Exposes the unsigned NIP-71 [template] plus the
+ * resolved coordinates the caller needs to construct a matching kind:1 sibling note: the
+ * orientation [kind] (34235/34236), the addressable [dTag] (replayable into an `a` tag), and
+ * the master [masterDimension] (largest rendition's WxH) so the kind:1 imeta carries the same
+ * dim as the NIP-71 master imeta.
+ */
+data class HlsBuiltTemplate(
+    val template: HlsVideoEventTemplate,
+    val kind: Int,
+    val dTag: String,
+    val masterDimension: DimensionTag?,
+)
+
 /**
 * Assembles a NIP-71 VideoHorizontalEvent / VideoVerticalEvent template from an HLS upload
 * result. Orientation is decided from the first rendition's width/height: portrait
@@ -86,7 +100,7 @@ sealed class HlsVideoEventTemplate {
 */
@OptIn(ExperimentalUuidApi::class)
 object HlsVideoEventBuilder {
-    fun build(input: HlsVideoPublishInput): HlsVideoEventTemplate {
+    fun build(input: HlsVideoPublishInput): HlsBuiltTemplate {
        val firstRendition = input.renditions.firstOrNull()
        val isVertical = firstRendition != null && firstRendition.height > firstRendition.width

@@ -131,24 +145,28 @@ object HlsVideoEventBuilder {
        val dTag = input.dTag ?: Uuid.random().toString()
        val createdAt = input.createdAt ?: TimeUtils.now()

-        return if (isVertical) {
-            HlsVideoEventTemplate.Vertical(
-                VideoVerticalEvent.build(input.description, dTag, createdAt) {
-                    videoIMetas(videoMetas)
-                    title(input.title)
-                    input.durationSeconds?.let { duration(it) }
-                    input.contentWarning?.let { contentWarning(it) }
-                },
-            )
-        } else {
-            HlsVideoEventTemplate.Horizontal(
-                VideoHorizontalEvent.build(input.description, dTag, createdAt) {
-                    videoIMetas(videoMetas)
-                    title(input.title)
-                    input.durationSeconds?.let { duration(it) }
-                    input.contentWarning?.let { contentWarning(it) }
-                },
-            )
-        }
+        val template =
+            if (isVertical) {
+                HlsVideoEventTemplate.Vertical(
+                    VideoVerticalEvent.build(input.description, dTag, createdAt) {
+                        videoIMetas(videoMetas)
+                        title(input.title)
+                        input.durationSeconds?.let { duration(it) }
+                        input.contentWarning?.let { contentWarning(it) }
+                    },
+                )
+            } else {
+                HlsVideoEventTemplate.Horizontal(
+                    VideoHorizontalEvent.build(input.description, dTag, createdAt) {
+                        videoIMetas(videoMetas)
+                        title(input.title)
+                        input.durationSeconds?.let { duration(it) }
+                        input.contentWarning?.let { contentWarning(it) }
+                    },
+                )
+            }
+
+        val kind = if (isVertical) VideoVerticalEvent.KIND else VideoHorizontalEvent.KIND
+        return HlsBuiltTemplate(template, kind, dTag, masterDimension)
    }
 }
@@ -31,10 +31,13 @@ import com.davotoula.lightcompressor.hls.Rendition
 import com.davotoula.lightcompressor.hls.SimpleHlsListener
 import com.vitorpamplona.amethyst.service.uploads.MediaUploadResult
 import com.vitorpamplona.amethyst.service.uploads.hls.HlsBlobUploader
+import com.vitorpamplona.amethyst.service.uploads.hls.HlsKind1SiblingBuilder
 import com.vitorpamplona.amethyst.service.uploads.hls.HlsVideoEventBuilder
 import com.vitorpamplona.amethyst.service.uploads.hls.HlsVideoEventTemplate
 import com.vitorpamplona.amethyst.service.uploads.hls.HlsVideoPublishInput
 import com.vitorpamplona.amethyst.ui.actions.mediaServers.ServerName
+import com.vitorpamplona.quartz.nip01Core.signers.EventTemplate
+import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
 import com.vitorpamplona.quartz.utils.Log
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -88,7 +91,15 @@ class HlsPublishOrchestrator(
    ) -> HlsUploadResult<MediaUploadResult>,
    private val buildUploader: (ServerName) -> HlsBlobUploader,
    private val uploadMaster: suspend (HlsBlobUploader, String) -> MediaUploadResult,
-    private val signAndPublish: suspend (HlsVideoEventTemplate) -> String,
+    // Signs and broadcasts the NIP-71 video event AND the kind:1 sibling note. The
+    // orchestrator hands the primary template plus a lazily-evaluated [buildSibling] closure
+    // that produces the kind:1 template — lazy so the orchestrator can capture the master
+    // metadata in scope without forcing kind:1 construction before the NIP-71 sign. Returns
+    // the NIP-71 event id.
+    private val signAndPublish: suspend (
+        primary: HlsVideoEventTemplate,
+        buildSibling: () -> EventTemplate<TextNoteEvent>,
+    ) -> String,
    // Generates a poster JPEG from the picked source video and uploads it via the supplied
    // uploader, returning the public URL. Returns null if poster generation isn't possible
    // (unsupported source, decode failure, no readable frame). Failures here must NOT fail
@@ -231,7 +242,7 @@ class HlsPublishOrchestrator(
                }

            _state.value = HlsPublishState.Publishing
-            val template =
+            val built =
                HlsVideoEventBuilder.build(
                    HlsVideoPublishInput(
                        renditions = uploadResult.renditions,
@@ -247,7 +258,19 @@ class HlsPublishOrchestrator(
                        thumbhash = posterResult?.thumbhash,
                    ),
                )
-            val eventId = signAndPublish(template)
+            val buildSibling: () -> EventTemplate<TextNoteEvent> = {
+                HlsKind1SiblingBuilder.build(
+                    title = request.title,
+                    description = request.description,
+                    masterUrl = masterUrl,
+                    masterSha256 = masterUpload.sha256,
+                    masterDimension = built.masterDimension,
+                    posterUrl = posterResult?.url,
+                    blurhashValue = posterResult?.blurhash,
+                    thumbhashValue = posterResult?.thumbhash,
+                )
+            }
+            val eventId = signAndPublish(built.template, buildSibling)

            _state.value =
                HlsPublishState.Success(
@@ -88,7 +88,7 @@ fun createProductionHlsPublishOrchestrator(
                }
            }
        },
-        signAndPublish = { template ->
+        signAndPublish = { template, buildSibling ->
            val inner =
                when (template) {
                    is HlsVideoEventTemplate.Horizontal -> template.template
@@ -96,6 +96,21 @@ fun createProductionHlsPublishOrchestrator(
                }
            val signed = account.signer.sign(inner)
            account.sendAutomatic(signed)
+
+            // Auto-publish the kind:1 sibling note so receivers that don't speak NIP-71 still
+            // see a rich preview (poster + dim + blurhash/thumbhash) and can hop to the
+            // addressable form via the imeta + `a` tag. Publishing the sibling must not throw
+            // out of the orchestrator on signer failure; the NIP-71 event is already broadcast
+            // and surfacing as a partial success is more useful than a hard fail.
+            val siblingTemplate = buildSibling()
+            try {
+                val signedSibling = account.signer.sign(siblingTemplate)
+                account.sendAutomatic(signedSibling)
+            } catch (e: kotlinx.coroutines.CancellationException) {
+                throw e
+            } catch (e: Throwable) {
+                Log.w(TAG) { "kind:1 sibling sign/publish failed: ${e.message}" }
+            }
            signed.id
        },
        uploadPoster = { uploader ->
@@ -83,7 +83,6 @@ import com.vitorpamplona.amethyst.commons.icons.symbols.MaterialSymbols
 import com.vitorpamplona.amethyst.ui.components.TextSpinner
 import com.vitorpamplona.amethyst.ui.components.TitleExplainer
 import com.vitorpamplona.amethyst.ui.navigation.navs.INav
-import com.vitorpamplona.amethyst.ui.navigation.routes.Route
 import com.vitorpamplona.amethyst.ui.navigation.topbars.TopBarWithBackButton
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import kotlinx.collections.immutable.toImmutableList
@@ -323,31 +322,6 @@ private fun FormFields(vm: NewHlsVideoViewModel) {
        )
    }

-    Spacer(Modifier.height(8.dp))
-
-    // Draft-a-note-after-upload toggle — opens the existing short-note composer prefilled
-    // with the title, description and master playlist URL; the user edits and posts.
-    Row(
-        modifier = Modifier.fillMaxWidth(),
-        verticalAlignment = Alignment.CenterVertically,
-    ) {
-        Column(modifier = Modifier.weight(1f)) {
-            Text(
-                text = stringResource(R.string.hls_draft_note_after_upload),
-                style = MaterialTheme.typography.bodyLarge,
-            )
-            Text(
-                text = stringResource(R.string.hls_draft_note_after_upload_explainer),
-                style = MaterialTheme.typography.bodySmall,
-                color = MaterialTheme.colorScheme.onSurfaceVariant,
-            )
-        }
-        Switch(
-            checked = vm.draftNoteAfterUpload,
-            onCheckedChange = { vm.draftNoteAfterUpload = it },
-        )
-    }
-
    Spacer(Modifier.height(16.dp))

    // Server picker — reads the user's configured Blossom servers from the account
@@ -686,54 +660,18 @@ private fun SuccessBody(
        )
        Spacer(Modifier.height(16.dp))

-        if (vm.draftNoteAfterUpload) {
-            Button(
-                onClick = {
-                    val draft = buildDraftNoteText(vm.title, vm.description, state.masterUrl)
-                    vm.reset()
-                    // Pop the HLS publish screen off the back stack as we open the composer,
-                    // so that after the user posts (or backs out of) the draft they land on
-                    // the screen they came from, not back on the HLS publish flow.
-                    nav.popUpTo(Route.NewShortNote(message = draft), Route.NewHlsVideo::class)
-                },
-                modifier = Modifier.fillMaxWidth(),
-            ) {
-                Text(stringResource(R.string.hls_draft_note_button))
-            }
-            Spacer(Modifier.height(8.dp))
-            OutlinedButton(
-                onClick = {
-                    vm.reset()
-                    nav.popBack()
-                },
-                modifier = Modifier.fillMaxWidth(),
-            ) {
-                Text(stringResource(R.string.hls_done))
-            }
-        } else {
-            Button(
-                onClick = {
-                    vm.reset()
-                    nav.popBack()
-                },
-                modifier = Modifier.fillMaxWidth(),
-            ) {
-                Text(stringResource(R.string.hls_done))
-            }
+        Button(
+            onClick = {
+                vm.reset()
+                nav.popBack()
+            },
+            modifier = Modifier.fillMaxWidth(),
+        ) {
+            Text(stringResource(R.string.hls_done))
        }
    }
 }

-private fun buildDraftNoteText(
-    title: String,
-    description: String,
-    masterUrl: String,
-): String =
-    listOf(title, description, masterUrl)
-        .map { it.trim() }
-        .filter { it.isNotEmpty() }
-        .joinToString("\n\n")
-
@Composable
 private fun FailureBody(
    vm: NewHlsVideoViewModel,
@@ -64,7 +64,6 @@ open class NewHlsVideoViewModel : ViewModel() {
    var sensitiveContent by mutableStateOf(false)
    var contentWarningReason by mutableStateOf("")
    var useH265 by mutableStateOf(true)
-    var draftNoteAfterUpload by mutableStateOf(true)
    var selectedServer by mutableStateOf<ServerName?>(null)

    var selectedRenditionLabels by mutableStateOf(
@@ -2586,9 +2586,6 @@
    <string name="hls_view_note">View note</string>
    <string name="hls_done">Done</string>
    <string name="hls_try_again">Try again</string>
-    <string name="hls_draft_note_after_upload">Draft note after upload</string>
-    <string name="hls_draft_note_after_upload_explainer">Open the note composer pre-filled with the title, description and video link so you can tweak it before posting.</string>
-    <string name="hls_draft_note_button">Draft note</string>

    <string name="pack_actions_dialog_title">Pack Actions</string>
    <string name="list_actions_dialog_title">List Actions</string>
@@ -161,7 +161,7 @@ class HlsPublishOrchestratorTest {
                runUpload = fakeRunUpload(),
                buildUploader = { canned },
                uploadMaster = fakeUploadMaster(canned),
-                signAndPublish = { tpl ->
+                signAndPublish = { tpl, _ ->
                    publishedTemplates += tpl
                    "signed-event-id"
                },
@@ -221,7 +221,7 @@ class HlsPublishOrchestratorTest {
                runUpload = capturingRunUpload,
                buildUploader = { canned },
                uploadMaster = fakeUploadMaster(canned),
-                signAndPublish = {
+                signAndPublish = { _, _ ->
                    capturedDuringPublish += orchestrator.state.value
                    "event-id"
                },
@@ -247,7 +247,7 @@ class HlsPublishOrchestratorTest {
                runUpload = { _, _, _ -> throw RuntimeException("decode failed") },
                buildUploader = { CannedUploader() },
                uploadMaster = { _, _ -> MediaUploadResult(url = "never") },
-                signAndPublish = { "never" },
+                signAndPublish = { _, _ -> "never" },
            )

        runBlocking { orchestrator.publish(newRequest()) }
@@ -267,7 +267,7 @@ class HlsPublishOrchestratorTest {
                    HlsBlobUploader { _, _, _ -> throw RuntimeException("server 500") }
                },
                uploadMaster = { _, _ -> MediaUploadResult(url = "never") },
-                signAndPublish = { "never" },
+                signAndPublish = { _, _ -> "never" },
            )

        runBlocking { orchestrator.publish(newRequest()) }
@@ -286,7 +286,7 @@ class HlsPublishOrchestratorTest {
                runUpload = fakeRunUpload(),
                buildUploader = { canned },
                uploadMaster = { _, _ -> throw RuntimeException("master upload failed") },
-                signAndPublish = { "never" },
+                signAndPublish = { _, _ -> "never" },
            )

        runBlocking { orchestrator.publish(newRequest()) }
@@ -305,7 +305,7 @@ class HlsPublishOrchestratorTest {
                runUpload = fakeRunUpload(),
                buildUploader = { canned },
                uploadMaster = fakeUploadMaster(canned),
-                signAndPublish = { throw RuntimeException("relay rejected") },
+                signAndPublish = { _, _ -> throw RuntimeException("relay rejected") },
            )

        runBlocking { orchestrator.publish(newRequest()) }
@@ -325,7 +325,7 @@ class HlsPublishOrchestratorTest {
                runUpload = fakeRunUpload(),
                buildUploader = { canned },
                uploadMaster = fakeUploadMaster(canned),
-                signAndPublish = { tpl ->
+                signAndPublish = { tpl, _ ->
                    captured += tpl
                    "event-id"
                },
@@ -363,7 +363,7 @@ class HlsPublishOrchestratorTest {
                runUpload = fakeRunUpload(portrait),
                buildUploader = { canned },
                uploadMaster = fakeUploadMaster(canned),
-                signAndPublish = { tpl ->
+                signAndPublish = { tpl, _ ->
                    captured += tpl
                    "event-id"
                },
@@ -384,7 +384,7 @@ class HlsPublishOrchestratorTest {
                runUpload = fakeRunUpload(),
                buildUploader = { canned },
                uploadMaster = fakeUploadMaster(canned),
-                signAndPublish = { tpl ->
+                signAndPublish = { tpl, _ ->
                    captured += tpl
                    "event-id"
                },
@@ -412,7 +412,7 @@ class HlsPublishOrchestratorTest {
                runUpload = fakeRunUpload(),
                buildUploader = { canned },
                uploadMaster = fakeUploadMaster(canned),
-                signAndPublish = { tpl ->
+                signAndPublish = { tpl, _ ->
                    captured += tpl
                    "event-id"
                },
@@ -440,7 +440,7 @@ class HlsPublishOrchestratorTest {
                runUpload = { _, _, _ -> throw RuntimeException("boom") },
                buildUploader = { CannedUploader() },
                uploadMaster = { _, _ -> MediaUploadResult(url = "never") },
-                signAndPublish = { "never" },
+                signAndPublish = { _, _ -> "never" },
            )

        runBlocking { orchestrator.publish(newRequest()) }
@@ -120,8 +120,8 @@ class HlsVideoEventBuilderTest {
    fun landscapeRenditionsBuildHorizontalTemplateKind34235() {
        val result = HlsVideoEventBuilder.build(input(landscapeRenditions))

-        assertTrue("expected Horizontal template", result is HlsVideoEventTemplate.Horizontal)
-        val template = (result as HlsVideoEventTemplate.Horizontal).template
+        assertTrue("expected Horizontal template", result.template is HlsVideoEventTemplate.Horizontal)
+        val template = (result.template as HlsVideoEventTemplate.Horizontal).template
        assertEquals(VideoHorizontalEvent.KIND, template.kind)
        assertEquals("A cool video", template.content)
    }
@@ -130,15 +130,15 @@ class HlsVideoEventBuilderTest {
    fun portraitRenditionsBuildVerticalTemplateKind34236() {
        val result = HlsVideoEventBuilder.build(input(portraitRenditions))

-        assertTrue("expected Vertical template", result is HlsVideoEventTemplate.Vertical)
-        val template = (result as HlsVideoEventTemplate.Vertical).template
+        assertTrue("expected Vertical template", result.template is HlsVideoEventTemplate.Vertical)
+        val template = (result.template as HlsVideoEventTemplate.Vertical).template
        assertEquals(VideoVerticalEvent.KIND, template.kind)
    }

    @Test
    fun horizontalTemplateHasTitleAndDTag() {
        val result = HlsVideoEventBuilder.build(input(landscapeRenditions))
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags

        val title = tags.findTag("title")
        assertNotNull(title)
@@ -152,7 +152,7 @@ class HlsVideoEventBuilderTest {
    @Test
    fun templateContainsOneImetaForMasterAndOnePerRendition() {
        val result = HlsVideoEventBuilder.build(input(landscapeRenditions))
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags

        val imetas = tags.findAllTags("imeta")
        // 1 master + 2 renditions
@@ -181,7 +181,7 @@ class HlsVideoEventBuilderTest {
            HlsVideoEventBuilder.build(
                input(landscapeRenditions, duration = 123),
            )
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags

        val duration = tags.findTag("duration")
        assertNotNull(duration)
@@ -191,7 +191,7 @@ class HlsVideoEventBuilderTest {
    @Test
    fun noDurationTagWhenNotProvided() {
        val result = HlsVideoEventBuilder.build(input(landscapeRenditions))
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags
        assertNull(tags.findTag("duration"))
    }

@@ -201,7 +201,7 @@ class HlsVideoEventBuilderTest {
            HlsVideoEventBuilder.build(
                input(landscapeRenditions, contentWarning = "NSFW"),
            )
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags

        val warning = tags.findTag("content-warning")
        assertNotNull(warning)
@@ -211,14 +211,14 @@ class HlsVideoEventBuilderTest {
    @Test
    fun noContentWarningTagWhenNull() {
        val result = HlsVideoEventBuilder.build(input(landscapeRenditions))
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags
        assertNull(tags.findTag("content-warning"))
    }

    @Test
    fun horizontalTemplateCarriesAutoGeneratedAltTag() {
        val result = HlsVideoEventBuilder.build(input(landscapeRenditions))
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags
        val alt = tags.findTag("alt")
        assertNotNull(alt)
        assertEquals(VideoHorizontalEvent.ALT_DESCRIPTION, alt!![1])
@@ -227,7 +227,7 @@ class HlsVideoEventBuilderTest {
    @Test
    fun verticalTemplateCarriesVerticalAltTag() {
        val result = HlsVideoEventBuilder.build(input(portraitRenditions))
-        val tags = (result as HlsVideoEventTemplate.Vertical).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Vertical).template.tags
        val alt = tags.findTag("alt")
        assertNotNull(alt)
        assertEquals(VideoVerticalEvent.ALT_DESCRIPTION, alt!![1])
@@ -239,7 +239,7 @@ class HlsVideoEventBuilderTest {
            HlsVideoEventBuilder.build(
                input(landscapeRenditions, posterUrl = "https://cdn.test/poster.jpg"),
            )
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags

        val imetas = tags.findAllTags("imeta")
        // 1 master + 2 renditions, each must carry image <posterUrl>
@@ -253,7 +253,7 @@ class HlsVideoEventBuilderTest {
    @Test
    fun noPosterUrlMeansNoImagePropertyOnImetas() {
        val result = HlsVideoEventBuilder.build(input(landscapeRenditions))
-        val tags = (result as HlsVideoEventTemplate.Horizontal).template.tags
+        val tags = (result.template as HlsVideoEventTemplate.Horizontal).template.tags

        val imetas = tags.findAllTags("imeta")
        imetas.forEach { imeta ->