限制 Raw 图片仅接收八位 PNG

使用 png 解码器读取位深并在 image 解码前拒绝非八位输入。

统一返回稳定的 8-bit PNG 客户端错误并补充十六位 PNG 测试。

server-rs/Cargo.lock

@@ -240,6 +240,7 @@ dependencies = [
  "platform-oss",
  "platform-speech",
  "platform-wechat",
+ "png",
  "regex",
  "reqwest",
  "ring",

server-rs/Cargo.toml

@@ -87,6 +87,7 @@ http-body-util = "0.1"
 httpdate = "1"
 hex = "0.4"
 image = { version = "0.25", default-features = false }
+png = "0.18"
 jsonwebtoken = "9"
 log = "0.4"
 mime_guess = "2.0.5"

server-rs/crates/api-server/Cargo.toml

@@ -14,6 +14,7 @@ bytes = { workspace = true }
 dotenvy = { workspace = true }
 hex = { workspace = true }
 image = { workspace = true, features = ["jpeg", "png", "webp"] }
+png = { workspace = true }
 http-body-util = { workspace = true }
 reqwest = { workspace = true, features = ["json", "multipart", "rustls-tls"] }
 regex = { workspace = true }