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LibWeb: Use Optional<String> for encoding_from_content_type

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This patch changes the encoding_from_content_type function to only
return an encoding if it actually finds one, and leave it up to the
caller to decided on a default to use.

It also modifies the caller to expect an Optional<String> (instead of
relying on the null state of the String class) as a return value and
separates the encoding and MIME type determination. This will be built
upon in a further commit.
This commit is contained in:
Max Wipfli 2021-05-12 10:07:17 +02:00 committed by Andreas Kling
parent d325403cb5
commit ce6d6706a6
Notes: sideshowbarker 2024-07-18 17:48:47 +09:00 
Author: https://github.com/MaxWipfli
Commit: https://github.com/SerenityOS/serenity/commit/ce6d6706a67
Pull-request: https://github.com/SerenityOS/serenity/pull/7055
Issue: https://github.com/SerenityOS/serenity/issues/6910
Reviewed-by: https://github.com/Dexesttp
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/linusg
1 changed files with 14 additions and 6 deletions
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20
Userland/Libraries/LibWeb/Loader/Resource.cpp
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@ -41,7 +41,7 @@ void Resource::for_each_client(Function<void(ResourceClient&)> callback)
}
}
static String encoding_from_content_type(const String& content_type)
static Optional<String> encoding_from_content_type(const String& content_type)
{
auto offset = content_type.index_of("charset=");
if (offset.has_value()) {
@ -53,7 +53,7 @@ static String encoding_from_content_type(const String& content_type)
return encoding;
}
return "utf-8";
return {};
}
static String mime_type_from_content_type(const String& content_type)
@ -74,20 +74,28 @@ void Resource::did_load(Badge<ResourceLoader>, ReadonlyBytes data, const HashMap
m_loaded = true;
auto content_type = headers.get("Content-Type");
if (content_type.has_value()) {
dbgln_if(RESOURCE_DEBUG, "Content-Type header: '{}'", content_type.value());
m_encoding = encoding_from_content_type(content_type.value());
m_mime_type = mime_type_from_content_type(content_type.value());
} else if (url().protocol() == "data" && !url().data_mime_type().is_empty()) {
dbgln_if(RESOURCE_DEBUG, "This is a data URL with mime-type _{}_", url().data_mime_type());
m_encoding = "utf-8"; // FIXME: This doesn't seem nice.
m_mime_type = url().data_mime_type();
} else {
dbgln_if(RESOURCE_DEBUG, "No Content-Type header to go on! Guessing based on filename...");
m_encoding = "utf-8"; // FIXME: This doesn't seem nice.
m_mime_type = Core::guess_mime_type_based_on_filename(url().path());
}
if (content_type.has_value()) {
auto encoding = encoding_from_content_type(content_type.value());
if (encoding.has_value()) {
dbgln_if(RESOURCE_DEBUG, "Set encoding '{}' from Content-Type", encoding.has_value());
m_encoding = encoding.value();
} else {
// FIXME: This doesn't seem nice.
m_encoding = "utf-8";
}
}
for_each_client([](auto& client) {
client.resource_did_load();
});