Fullfør oppgave 7.8: SRT-eksport fra transkripsjons-segmenter

Nytt GET /query/segments/srt-endepunkt som genererer nedlastbar SRT-fil
fra transcription_segments-tabellen. Bruker RLS-verifisert tilgang.
Frontend har nedlastingsknapp i TranscriptionView med autentisert fetch.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/lib/api.ts

@@ -164,6 +164,25 @@ export async function fetchSegments(
 	return res.json();
 }
 
+/** Last ned SRT-fil for en media-node. Trigger filnedlasting i nettleseren. */
+export async function downloadSrt(accessToken: string, nodeId: string): Promise<void> {
+	const res = await fetch(
+		`${BASE_URL}/query/segments/srt?node_id=${encodeURIComponent(nodeId)}`,
+		{ headers: { Authorization: `Bearer ${accessToken}` } }
+	);
+	if (!res.ok) {
+		const body = await res.text();
+		throw new Error(`SRT-eksport feilet (${res.status}): ${body}`);
+	}
+	const blob = await res.blob();
+	const url = URL.createObjectURL(blob);
+	const a = document.createElement('a');
+	a.href = url;
+	a.download = 'transcription.srt';
+	a.click();
+	URL.revokeObjectURL(url);
+}
+
 /** Oppdater teksten i et transkripsjons-segment. */
 export function updateSegment(
 	accessToken: string,

frontend/src/lib/components/TranscriptionView.svelte

@@ -4,6 +4,7 @@
 		updateSegment,
 		fetchTranscriptionVersions,
 		retranscribe,
+		downloadSrt,
 		type Segment,
 		type TranscriptionVersion
 	} from '$lib/api';
@@ -168,6 +169,14 @@
 		polling = false;
 	}
 
+	async function handleDownloadSrt() {
+		try {
+			await downloadSrt(accessToken, nodeId);
+		} catch (e) {
+			console.error('SRT-nedlasting feilet:', e);
+		}
+	}
+
 	function handleComparisonDone() {
 		showCompare = false;
 		loadSegments(nodeId, accessToken);
@@ -227,6 +236,20 @@
 					Sammenlign versjoner
 				</button>
 			{/if}
+			<button
+				onclick={handleDownloadSrt}
+				class="text-[10px] text-gray-400 hover:text-blue-600 flex items-center gap-0.5"
+				title="Last ned SRT-fil"
+			>
+				<svg class="h-3 w-3" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+					<path
+						stroke-linecap="round"
+						stroke-linejoin="round"
+						d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"
+					/>
+				</svg>
+				SRT
+			</button>
 			<button
 				onclick={handleRetranscribe}
 				disabled={retranscribing || polling}

maskinrommet/src/main.rs

@@ -140,6 +140,7 @@ async fn main() {
         .route("/cas/{hash}", get(serving::get_cas_file))
         .route("/query/nodes", get(queries::query_nodes))
         .route("/query/segments", get(queries::query_segments))
+        .route("/query/segments/srt", get(queries::export_srt))
         .route("/intentions/update_segment", post(intentions::update_segment))
         .route("/intentions/retranscribe", post(intentions::retranscribe))
         .route("/intentions/resolve_retranscription", post(intentions::resolve_retranscription))

maskinrommet/src/queries.rs

@@ -7,6 +7,7 @@
 // Ref: docs/retninger/datalaget.md (tunge spørringer-seksjonen)
 
 use axum::{extract::State, http::StatusCode, Json};
+use axum::response::{IntoResponse, Response};
 use serde::{Deserialize, Serialize};
 use sqlx::PgPool;
 use uuid::Uuid;
@@ -290,6 +291,87 @@ pub async fn query_segments_version(
     }))
 }
 
+// =============================================================================
+// GET /query/segments/srt — eksporter segmenter som nedlastbar SRT-fil
+// =============================================================================
+
+/// GET /query/segments/srt?node_id=...
+///
+/// Genererer en SRT-fil fra nyeste transkripsjons-segmenter.
+/// Returnerer filen med Content-Disposition: attachment for nedlasting.
+pub async fn export_srt(
+    State(state): State<AppState>,
+    user: AuthUser,
+    axum::extract::Query(params): axum::extract::Query<QuerySegmentsRequest>,
+) -> Result<Response, (StatusCode, Json<ErrorResponse>)> {
+    let resp = run_query_segments(&state.db, user.node_id, params.node_id)
+        .await
+        .map_err(|e| {
+            tracing::error!(error = %e, "export_srt feilet");
+            internal_error("Databasefeil ved henting av segmenter")
+        })?;
+
+    if resp.segments.is_empty() {
+        return Err((
+            StatusCode::NOT_FOUND,
+            Json(ErrorResponse {
+                error: "Ingen transkripsjons-segmenter funnet".to_string(),
+            }),
+        ));
+    }
+
+    let srt = segments_to_srt(&resp.segments);
+
+    Ok((
+        StatusCode::OK,
+        [
+            (axum::http::header::CONTENT_TYPE, "application/x-subrip; charset=utf-8"),
+            (axum::http::header::CONTENT_DISPOSITION, "attachment; filename=\"transcription.srt\""),
+        ],
+        srt,
+    )
+        .into_response())
+}
+
+/// Konverterer segmenter til SRT-format.
+///
+/// SRT-format:
+/// ```text
+/// 1
+/// 00:00:00,000 --> 00:00:05,230
+/// Hei og velkommen.
+///
+/// 2
+/// 00:00:05,230 --> 00:00:10,500
+/// I dag snakker vi om...
+/// ```
+fn segments_to_srt(segments: &[SegmentResult]) -> String {
+    let mut srt = String::new();
+    for (i, seg) in segments.iter().enumerate() {
+        if i > 0 {
+            srt.push('\n');
+        }
+        srt.push_str(&format!(
+            "{}\n{} --> {}\n{}\n",
+            seg.seq,
+            format_srt_timestamp(seg.start_ms),
+            format_srt_timestamp(seg.end_ms),
+            seg.content,
+        ));
+    }
+    srt
+}
+
+/// Formaterer millisekunder til SRT-tidsstempel: HH:MM:SS,mmm
+fn format_srt_timestamp(ms: i32) -> String {
+    let total_seconds = ms / 1000;
+    let millis = ms % 1000;
+    let hours = total_seconds / 3600;
+    let minutes = (total_seconds % 3600) / 60;
+    let seconds = total_seconds % 60;
+    format!("{:02}:{:02}:{:02},{:03}", hours, minutes, seconds, millis)
+}
+
 // =============================================================================
 // RLS-kontekst
 // =============================================================================
@@ -475,3 +557,66 @@ async fn run_query_nodes(
 
     Ok(QueryNodesResponse { nodes, total })
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_format_srt_timestamp() {
+        assert_eq!(format_srt_timestamp(0), "00:00:00,000");
+        assert_eq!(format_srt_timestamp(5230), "00:00:05,230");
+        assert_eq!(format_srt_timestamp(83456), "00:01:23,456");
+        assert_eq!(format_srt_timestamp(3_600_000), "01:00:00,000");
+        assert_eq!(format_srt_timestamp(3_723_456), "01:02:03,456");
+    }
+
+    #[test]
+    fn test_segments_to_srt() {
+        let segments = vec![
+            SegmentResult {
+                id: 1,
+                seq: 1,
+                start_ms: 0,
+                end_ms: 5230,
+                content: "Hei og velkommen.".to_string(),
+                edited: false,
+            },
+            SegmentResult {
+                id: 2,
+                seq: 2,
+                start_ms: 5230,
+                end_ms: 10500,
+                content: "I dag snakker vi om fotball.".to_string(),
+                edited: true,
+            },
+        ];
+
+        let srt = segments_to_srt(&segments);
+        let expected = "\
+1
+00:00:00,000 --> 00:00:05,230
+Hei og velkommen.
+
+2
+00:00:05,230 --> 00:00:10,500
+I dag snakker vi om fotball.
+";
+        assert_eq!(srt, expected);
+    }
+
+    #[test]
+    fn test_segments_to_srt_single() {
+        let segments = vec![SegmentResult {
+            id: 1,
+            seq: 1,
+            start_ms: 0,
+            end_ms: 3000,
+            content: "Bare ett segment.".to_string(),
+            edited: false,
+        }];
+
+        let srt = segments_to_srt(&segments);
+        assert_eq!(srt, "1\n00:00:00,000 --> 00:00:03,000\nBare ett segment.\n");
+    }
+}

tasks.md

@@ -100,8 +100,7 @@ Uavhengige faser kan fortsatt plukkes.
 - [x] 7.5 Segmenttabell-migrasjon: opprett `transcription_segments`-tabell i PG. Oppdater `transcribe.rs` til SRT-format → parse → skriv segmenter. Miljøvariabler: `WHISPER_MODEL` (default "medium"), `WHISPER_INITIAL_PROMPT`. Ref: `docs/concepts/podcastfabrikken.md` § 3.
 - [x] 7.6 Transkripsjonsvisning i frontend: segmenter med tidsstempler, avspillingsknapp per segment (hopper til riktig sted i lydfilen), redigerbare tekstfelt (setter `edited = true`). Universell komponent for podcast, møter, voice memos.
 - [x] 7.7 Re-transkripsjonsflyt: ved ny transkripsjon, vis side-om-side med forrige versjon. Highlight manuelt redigerte segmenter fra forrige versjon. Bruker velger per segment.
-- [~] 7.8 SRT-eksport: generer nedlastbar SRT-fil fra `transcription_segments`-tabellen.
+- [x] 7.8 SRT-eksport: generer nedlastbar SRT-fil fra `transcription_segments`-tabellen.
-  > Påbegynt: 2026-03-17T18:43
 
 ## Fase 8: Aliaser