补充 Raw 图片参数预检查

在计费前校验质量、背景和输出格式

规范化可选参数并保持单图请求契约

server-rs/crates/api-server/src/raw_image.rs

@@ -119,6 +119,24 @@ fn prepare_request(payload: RawImageEditRequest) -> Result<PreparedRawImageEdit,
     if payload.width == 0 || payload.height == 0 {
         return Err(bad_request("width 和 height 必须为正整数"));
     }
+    validate_optional_value(
+        payload.quality.as_deref(),
+        "quality",
+        ["low", "medium", "high", "auto"],
+    )?;
+    validate_optional_value(
+        payload.background.as_deref(),
+        "background",
+        ["transparent", "opaque", "auto"],
+    )?;
+    validate_optional_value(
+        payload.output_format.as_deref(),
+        "output_format",
+        ["png", "webp", "jpeg"],
+    )?;
+    let quality = normalize_optional(payload.quality);
+    let background = normalize_optional(payload.background);
+    let output_format = normalize_optional(payload.output_format);
     let image = decode_image(payload.image, "image")?;
     let mask = payload
         .mask
@@ -128,9 +146,9 @@ fn prepare_request(payload: RawImageEditRequest) -> Result<PreparedRawImageEdit,
         image,
         prompt: payload.prompt,
         options: RawImageEditOptions {
-            quality: payload.quality,
-            background: payload.background,
-            output_format: payload.output_format,
+            quality,
+            background,
+            output_format,
             width: payload.width,
             height: payload.height,
             mask,
@@ -140,6 +158,26 @@ fn prepare_request(payload: RawImageEditRequest) -> Result<PreparedRawImageEdit,
     })
 }
 
+fn normalize_optional(value: Option<String>) -> Option<String> {
+    value
+        .map(|value| value.trim().to_string())
+        .filter(|value| !value.is_empty())
+}
+
+fn validate_optional_value<const N: usize>(
+    value: Option<&str>,
+    field: &str,
+    allowed: [&str; N],
+) -> Result<(), AppError> {
+    let Some(value) = value.map(str::trim).filter(|value| !value.is_empty()) else {
+        return Ok(());
+    };
+    if allowed.contains(&value) {
+        return Ok(());
+    }
+    Err(bad_request(format!("{field} 值无效")))
+}
+
 fn decode_image(value: RawImageData, field: &str) -> Result<ReferenceImage, AppError> {
     let mime_type = value.mime_type.trim().to_string();
     if mime_type.is_empty() {