A Bash script that reads a JSON input containing a message field, sends the message to OpenAI’s text-to-speech (TTS) API using a cheerful voice, and plays the resulting audio using afplay on macOS. Requires jq for JSON parsing and an OPENAI_API_KEY environment variable.

chatgptsay.sh

#!/bin/bash

# 讀取 JSON 輸入
json_input="$(cat)"

# 擷取 message 欄位（需要 jq）
message="$(echo "$json_input" | jq -r '.message')"

# 如果 jq 或訊息抓不到，就退出
if [[ -z "$message" || "$message" == "null" ]]; then
  echo "Error: No valid message found in input JSON." >&2
  exit 1
fi

# 檢查必要環境變數
if [[ -z "$OPENAI_API_KEY" ]]; then
  echo "Error: OPENAI_API_KEY is not set." >&2
  exit 2
fi

# 設定 API 資訊
api_url="https://api.openai.com/v1/audio/speech"
voice="coral"
instructions="Speak in a cheerful and positive tone."

# 播放機制（macOS）
if command -v afplay >/dev/null 2>&1; then
  tmpfile="$(mktemp /tmp/speech.XXXXXX.mp3)"

  # 呼叫 OpenAI TTS API
  curl -s "$api_url" \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -H "Content-Type: application/json" \
    -d "{
      \"model\": \"gpt-4o-mini-tts\",
      \"input\": \"$message\",
      \"voice\": \"$voice\",
      \"instructions\": \"$instructions\"
    }" -o "$tmpfile"

  # 播放音檔
  afplay "$tmpfile"
  rm -f "$tmpfile"
else
  echo "Error: 'afplay' not found. This script requires macOS." >&2
  exit 3
fi