feat: templatized proxy error page

internal/config/proxy_server.go

@@ -7,22 +7,26 @@ import (
 )
 
 type ProxyServerConfig struct {
-	HTTP      HTTPConfig      `yaml:"http"`
-	Metrics   MetricsConfig   `yaml:"metrics"`
-	Transport TransportConfig `yaml:"transport"`
-	Dial      DialConfig      `yaml:"dial"`
-	Sentry    SentryConfig    `yaml:"sentry"`
-	Cache     CacheConfig     `yaml:"cache"`
+	Debug     InterpolatedBool `yaml:"debug"`
+	HTTP      HTTPConfig       `yaml:"http"`
+	Metrics   MetricsConfig    `yaml:"metrics"`
+	Transport TransportConfig  `yaml:"transport"`
+	Dial      DialConfig       `yaml:"dial"`
+	Sentry    SentryConfig     `yaml:"sentry"`
+	Cache     CacheConfig      `yaml:"cache"`
+	Templates TemplatesConfig  `yaml:"templates"`
 }
 
 func NewDefaultProxyServerConfig() ProxyServerConfig {
 	return ProxyServerConfig{
+		Debug:     false,
 		HTTP:      NewHTTPConfig("0.0.0.0", 8080),
 		Metrics:   NewDefaultMetricsConfig(),
 		Transport: NewDefaultTransportConfig(),
 		Dial:      NewDefaultDialConfig(),
 		Sentry:    NewDefaultSentryConfig(),
 		Cache:     NewDefaultCacheConfig(),
+		Templates: NewDefaultTemplatesConfig(),
 	}
 }
 
@@ -115,3 +119,13 @@ func NewDefaultCacheConfig() CacheConfig {
 		TTL: *NewInterpolatedDuration(time.Second * 30),
 	}
 }
+
+type TemplatesConfig struct {
+	Dir InterpolatedString `yaml:"dir"`
+}
+
+func NewDefaultTemplatesConfig() TemplatesConfig {
+	return TemplatesConfig{
+		Dir: "./templates",
+	}
+}