ac1bb1d97b
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Add complete Academy backend (Go) and frontend (Next.js) for DSGVO/IT-Security/AI-Literacy compliance training: - Go backend: Course CRUD, enrollments, quiz evaluation, PDF certificates (gofpdf), video generation pipeline (ElevenLabs + HeyGen) - In-memory data store with PostgreSQL migration for future DB support - Frontend: Course creation (AI + manual), lesson viewer, interactive quiz, certificate viewer with PDF download - Fix existing compile errors in generate.go (SearchResult type mismatch), llm/service.go (unused var), rag/service.go (Unicode chars) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package academy
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"os"
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"time"
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)
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// ElevenLabsClient handles text-to-speech via the ElevenLabs API
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type ElevenLabsClient struct {
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apiKey string
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voiceID string
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client *http.Client
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}
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// NewElevenLabsClient creates a new ElevenLabs client
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func NewElevenLabsClient() *ElevenLabsClient {
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apiKey := os.Getenv("ELEVENLABS_API_KEY")
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voiceID := os.Getenv("ELEVENLABS_VOICE_ID")
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if voiceID == "" {
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voiceID = "EXAVITQu4vr4xnSDxMaL" // Default: "Sarah" voice
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}
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return &ElevenLabsClient{
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apiKey: apiKey,
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voiceID: voiceID,
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client: &http.Client{
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Timeout: 120 * time.Second,
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},
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}
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}
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// IsConfigured returns true if API key is set
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func (c *ElevenLabsClient) IsConfigured() bool {
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return c.apiKey != ""
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}
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// TextToSpeechRequest represents the API request
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type TextToSpeechRequest struct {
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Text string `json:"text"`
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ModelID string `json:"model_id"`
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VoiceSettings VoiceSettings `json:"voice_settings"`
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}
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// VoiceSettings controls voice parameters
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type VoiceSettings struct {
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Stability float64 `json:"stability"`
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SimilarityBoost float64 `json:"similarity_boost"`
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Style float64 `json:"style"`
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}
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// TextToSpeech converts text to speech audio (MP3)
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func (c *ElevenLabsClient) TextToSpeech(text string) ([]byte, error) {
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if !c.IsConfigured() {
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return nil, fmt.Errorf("ElevenLabs API key not configured")
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}
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url := fmt.Sprintf("https://api.elevenlabs.io/v1/text-to-speech/%s", c.voiceID)
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reqBody := TextToSpeechRequest{
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Text: text,
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ModelID: "eleven_multilingual_v2",
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VoiceSettings: VoiceSettings{
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Stability: 0.5,
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SimilarityBoost: 0.75,
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Style: 0.5,
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},
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}
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jsonBody, err := json.Marshal(reqBody)
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if err != nil {
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return nil, fmt.Errorf("failed to marshal request: %w", err)
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}
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req, err := http.NewRequest("POST", url, bytes.NewReader(jsonBody))
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if err != nil {
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return nil, fmt.Errorf("failed to create request: %w", err)
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("xi-api-key", c.apiKey)
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req.Header.Set("Accept", "audio/mpeg")
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resp, err := c.client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("ElevenLabs API request failed: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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body, _ := io.ReadAll(resp.Body)
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return nil, fmt.Errorf("ElevenLabs API error %d: %s", resp.StatusCode, string(body))
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}
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audioData, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read audio response: %w", err)
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}
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return audioData, nil
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}
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