bneradt commented on code in PR #13390:
URL: https://github.com/apache/trafficserver/pull/13390#discussion_r3590823540
##########
plugins/webp_transform/ImageTransform.cc:
##########
@@ -58,40 +59,75 @@ bool config_convert_to_jpeg = false;
Stat stat_convert_to_webp;
Stat stat_convert_to_jpeg;
+
+bool
+has_signature_for(std::string_view data, ImageEncoding encoding)
+{
+ constexpr std::string_view png_signature{"\x89PNG\r\n\x1a\n", 8};
+
+ switch (encoding) {
+ case ImageEncoding::webp:
+ return data.size() >= 12 && data.substr(0, 4) == "RIFF" && data.substr(8,
4) == "WEBP";
+ case ImageEncoding::jpeg:
+ return data.size() >= 3 && static_cast<unsigned char>(data[0]) == 0xff &&
static_cast<unsigned char>(data[1]) == 0xd8 &&
+ static_cast<unsigned char>(data[2]) == 0xff;
+ case ImageEncoding::png:
+ return data.starts_with(png_signature);
+ case ImageEncoding::unknown:
+ return false;
+ }
+
+ return false;
+}
} // namespace
class ImageTransform : public TransformationPlugin
{
public:
- ImageTransform(Transaction &transaction, ImageEncoding input_image_type,
ImageEncoding transform_image_type)
+ ImageTransform(Transaction &transaction, std::string input_content_type,
ImageEncoding input_image_type,
+ ImageEncoding transform_image_type)
: TransformationPlugin(transaction,
TransformationPlugin::RESPONSE_TRANSFORMATION),
+ _input_content_type(std::move(input_content_type)),
_input_image_type(input_image_type),
_transform_image_type(transform_image_type)
{
TransformationPlugin::registerHook(HOOK_READ_RESPONSE_HEADERS);
+ TransformationPlugin::registerHook(HOOK_SEND_RESPONSE_HEADERS);
}
void
handleReadResponseHeaders(Transaction &transaction) override
{
+ transaction.getServerResponse().getHeaders()["Vary"] = "Accept"; // to
have a separate cache entry
+
+ Dbg(webp_dbg_ctl, "url %s",
transaction.getServerRequest().getUrl().getUrlString().c_str());
+ transaction.resume();
+ }
+
+ void
+ handleSendResponseHeaders(Transaction &transaction) override
+ {
+ if (_transform_image_type == _input_image_type) {
+ transaction.getClientResponse().getHeaders()["Content-Type"] =
_input_content_type;
+ transaction.resume();
Review Comment:
Vary is set before ATS derives the client response. I added an outgoing
Vary: Accept replay assertion to verify propagation; it passes, so a duplicate
client-header write isn’t needed.
##########
plugins/webp_transform/ImageTransform.cc:
##########
@@ -125,13 +170,11 @@ class ImageTransform : public TransformationPlugin
produce(std::string_view(reinterpret_cast<const char
*>(output_blob.data()), output_blob.length()));
} catch (Magick::Warning &warning) {
TSError("ImageMagick++ warning: %s", warning.what());
- produce(std::string_view(reinterpret_cast<const char
*>(input_blob.data()), input_blob.length()));
- _transform_image_type = _input_image_type; // Revert to original
encoding on error
+ pass_through(std::string_view(reinterpret_cast<const char
*>(input_blob.data()), input_blob.length()));
} catch (Magick::Error &error) {
TSError("ImageMagick++ error: %s _image_type: %d input_data.length():
%zd", error.what(), (int)_transform_image_type,
input_data.length());
Review Comment:
Fixed %zd to %zu to match size_t.
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