Kling 4.0 Image to Video API

set -euo pipefail
: "${VIDGO_API_KEY:?Set VIDGO_API_KEY in your environment}"

REQUEST_BODY=$(cat <<'JSON'
{
  "model": "kwaivgi/kling-v4.0/image-to-video",
  "input": {
    "prompt": "The climber from the first image reaches up, finds a hold, and pulls herself onto the ledge shown in the second image. Chalk dust drifts from her hand, the rope sways gently below. Camera holds a steady side angle with a slight upward tilt. Late-afternoon sun on sandstone. Audio: wind across the rock face, a short exhale, carabiner clink. No text, no logos, no watermark.",
    "duration": 6,
    "resolution": "720p",
    "image_urls": [
      "https://cdn.vidgo.ai/apis/models/kwaivgi/kling-v4.0/image-to-video/v1/01/input-start-frame.webp",
      "https://cdn.vidgo.ai/apis/models/kwaivgi/kling-v4.0/image-to-video/v1/01/input-end-frame.webp"
    ]
  }
}
JSON
)

SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  --request POST \
  --url "https://api.vidgo.ai/api/generate/submit" \
  --header "Authorization: Bearer $VIDGO_API_KEY" \
  --header "Content-Type: application/json" \
  --data "$REQUEST_BODY")

TASK_ID=$(printf '%s' "$SUBMIT_RESPONSE" | jq -r '.data.task_id // .task_id // empty')
if [ -z "$TASK_ID" ]; then
  printf 'Submit response did not include task_id:
%s
' "$SUBMIT_RESPONSE" >&2
  exit 1
fi

while true; do
  STATUS_RESPONSE=$(curl --silent --show-error --fail-with-body \
    --url "https://api.vidgo.ai/api/generate/status/$TASK_ID" \
    --header "Authorization: Bearer $VIDGO_API_KEY")
  STATUS=$(printf '%s' "$STATUS_RESPONSE" | jq -r '.data.status // .status // empty')

  case "$STATUS" in
    finished)
      printf '%s' "$STATUS_RESPONSE" | jq -r '(.data.files // .files // [])[]?.file_url'
      break
      ;;
    failed)
      printf '%s' "$STATUS_RESPONSE" | jq -r '.data.error_message // .error_message // "Generation failed"' >&2
      exit 1
      ;;
    not_started|running)
      sleep 2
      ;;
    *)
      printf 'Unexpected task status: %s
' "$STATUS" >&2
      exit 1
      ;;
  esac
done