feat: 使用 viper 绑定配置，open ai api 添加认证配置

internal/config/config.go

@@ -2,41 +2,46 @@ package config
 
 import (
 	"fmt"
-	"os"
+	"strings"
 	"sync"
 
-	"gopkg.in/yaml.v3"
+	"github.com/spf13/viper"
 )
 
 // Config 包含应用程序的所有配置
 type Config struct {
-	Server ServerConfig `yaml:"server"`
-	TTS    TTSConfig    `yaml:"tts"`
+	Server ServerConfig `mapstructure:"server"`
+	TTS    TTSConfig    `mapstructure:"tts"`
+	OpenAI OpenAIConfig `mapstructure:"openai"`
+}
+
+// OpenAIConfig 包含OpenAI API配置
+type OpenAIConfig struct {
+	ApiKey string `mapstructure:"api_key"`
 }
 
 // ServerConfig 包含HTTP服务器配置
 type ServerConfig struct {
-	Port         int    `yaml:"port"`
-	ReadTimeout  int    `yaml:"read_timeout"`  // 单位：秒
-	WriteTimeout int    `yaml:"write_timeout"` // 单位：秒
-	BasePath     string `yaml:"base_path"`
+	Port         int    `mapstructure:"port"`
+	ReadTimeout  int    `mapstructure:"read_timeout"`
+	WriteTimeout int    `mapstructure:"write_timeout"`
+	BasePath     string `mapstructure:"base_path"`
 }
 
 // TTSConfig 包含Microsoft TTS API配置
 type TTSConfig struct {
-	APIKey            string            `yaml:"api_key"`
-	Region            string            `yaml:"region"`
-	DefaultVoice      string            `yaml:"default_voice"`
-	DefaultRate       string            `yaml:"default_rate"`
-	DefaultPitch      string            `yaml:"default_pitch"`
-	DefaultFormat     string            `yaml:"default_format"`
-	MaxTextLength     int               `yaml:"max_text_length"`
-	RequestTimeout    int               `yaml:"request_timeout"` // 单位：秒
-	MaxConcurrent     int               `yaml:"max_concurrent"`
-	SegmentThreshold  int               `yaml:"segment_threshold"`
-	MinSentenceLength int               `yaml:"min_sentence_length"`
-	MaxSentenceLength int               `yaml:"max_sentence_length"`
-	VoiceMapping      map[string]string `yaml:"voice_mapping"` // OpenAI声音到Azure声音的映射
+	Region            string            `mapstructure:"region"`
+	DefaultVoice      string            `mapstructure:"default_voice"`
+	DefaultRate       string            `mapstructure:"default_rate"`
+	DefaultPitch      string            `mapstructure:"default_pitch"`
+	DefaultFormat     string            `mapstructure:"default_format"`
+	MaxTextLength     int               `mapstructure:"max_text_length"`
+	RequestTimeout    int               `mapstructure:"request_timeout"`
+	MaxConcurrent     int               `mapstructure:"max_concurrent"`
+	SegmentThreshold  int               `mapstructure:"segment_threshold"`
+	MinSentenceLength int               `mapstructure:"min_sentence_length"`
+	MaxSentenceLength int               `mapstructure:"max_sentence_length"`
+	VoiceMapping      map[string]string `mapstructure:"voice_mapping"`
 }
 
 var (
@@ -48,20 +53,28 @@ var (
 func Load(configPath string) (*Config, error) {
 	var err error
 	once.Do(func() {
-		// 设置默认配置
-		setDefaults()
+		v := viper.New()
+
+		// 配置 Viper
+		v.SetConfigName("config")
+		v.SetConfigType("yaml")
+		v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+		v.AutomaticEnv() // 自动绑定环境变量
 
 		// 从配置文件加载
 		if configPath != "" {
-			err = loadFromFile(configPath)
-			if err != nil {
+			v.SetConfigFile(configPath)
+			if err = v.ReadInConfig(); err != nil {
 				err = fmt.Errorf("加载配置文件失败: %w", err)
 				return
 			}
 		}
 
-		// 从环境变量覆盖
-		overrideFromEnv()
+		// 将配置绑定到结构体
+		if err = v.Unmarshal(&config); err != nil {
+			err = fmt.Errorf("解析配置失败: %w", err)
+			return
+		}
 	})
 
 	if err != nil {
@@ -71,58 +84,6 @@ func Load(configPath string) (*Config, error) {
 	return &config, nil
 }
 
-// 设置默认配置值
-func setDefaults() {
-	config = Config{
-		Server: ServerConfig{
-			Port:         8080,
-			ReadTimeout:  30,
-			WriteTimeout: 30,
-			BasePath:     "",
-		},
-		TTS: TTSConfig{
-			DefaultVoice:      "zh-CN-XiaoxiaoNeural",
-			DefaultRate:       "0%",
-			DefaultPitch:      "0%",
-			DefaultFormat:     "audio-24khz-48kbitrate-mono-mp3",
-			MaxTextLength:     5000,
-			RequestTimeout:    30,
-			MaxConcurrent:     10,
-			SegmentThreshold:  500,
-			MinSentenceLength: 200,
-			MaxSentenceLength: 300,
-			VoiceMapping:      make(map[string]string),
-		},
-	}
-}
-
-// 从配置文件加载配置
-func loadFromFile(path string) error {
-	data, err := os.ReadFile(path)
-	if err != nil {
-		return err
-	}
-
-	return yaml.Unmarshal(data, &config)
-}
-
-// 从环境变量中覆盖配置
-func overrideFromEnv() {
-	if port := os.Getenv("TTS_SERVER_PORT"); port != "" {
-		fmt.Sscanf(port, "%d", &config.Server.Port)
-	}
-
-	if apiKey := os.Getenv("TTS_API_KEY"); apiKey != "" {
-		config.TTS.APIKey = apiKey
-	}
-
-	if region := os.Getenv("TTS_API_REGION"); region != "" {
-		config.TTS.Region = region
-	}
-
-	// 可以添加更多环境变量覆盖
-}
-
 // Get 返回已加载的配置
 func Get() *Config {
 	return &config