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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/filter/filter.h"
#include <utility>
#include "base/macros.h"
#include "net/base/io_buffer.h"
#include "net/filter/mock_filter_context.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
class PassThroughFilter : public Filter {
public:
PassThroughFilter() : Filter(FILTER_TYPE_UNSUPPORTED) {}
FilterStatus ReadFilteredData(char* dest_buffer, int* dest_len) override {
return CopyOut(dest_buffer, dest_len);
}
DISALLOW_COPY_AND_ASSIGN(PassThroughFilter);
};
} // namespace
TEST(FilterTest, ContentTypeId) {
// Check for basic translation of Content-Encoding, including case variations.
EXPECT_EQ(Filter::FILTER_TYPE_DEFLATE,
Filter::ConvertEncodingToType("deflate"));
EXPECT_EQ(Filter::FILTER_TYPE_DEFLATE,
Filter::ConvertEncodingToType("deflAte"));
EXPECT_EQ(Filter::FILTER_TYPE_GZIP,
Filter::ConvertEncodingToType("gzip"));
EXPECT_EQ(Filter::FILTER_TYPE_GZIP,
Filter::ConvertEncodingToType("GzIp"));
EXPECT_EQ(Filter::FILTER_TYPE_GZIP,
Filter::ConvertEncodingToType("x-gzip"));
EXPECT_EQ(Filter::FILTER_TYPE_GZIP,
Filter::ConvertEncodingToType("X-GzIp"));
EXPECT_EQ(Filter::FILTER_TYPE_SDCH,
Filter::ConvertEncodingToType("sdch"));
EXPECT_EQ(Filter::FILTER_TYPE_SDCH,
Filter::ConvertEncodingToType("sDcH"));
EXPECT_EQ(Filter::FILTER_TYPE_UNSUPPORTED,
Filter::ConvertEncodingToType("weird"));
EXPECT_EQ(Filter::FILTER_TYPE_UNSUPPORTED,
Filter::ConvertEncodingToType("strange"));
}
TEST(FilterTest, SdchEncoding) {
// Handle content encodings including SDCH.
const std::string kTextHtmlMime("text/html");
MockFilterContext filter_context;
// Empty handle indicates to filter that SDCH is active.
filter_context.SetSdchResponse(
SdchManager::CreateEmptyDictionarySetForTesting());
std::vector<Filter::FilterType> encoding_types;
// Check for most common encoding, and verify it survives unchanged.
encoding_types.clear();
encoding_types.push_back(Filter::FILTER_TYPE_SDCH);
encoding_types.push_back(Filter::FILTER_TYPE_GZIP);
filter_context.SetMimeType(kTextHtmlMime);
Filter::FixupEncodingTypes(filter_context, &encoding_types);
ASSERT_EQ(2U, encoding_types.size());
EXPECT_EQ(Filter::FILTER_TYPE_SDCH, encoding_types[0]);
EXPECT_EQ(Filter::FILTER_TYPE_GZIP, encoding_types[1]);
// Unchanged even with other mime types.
encoding_types.clear();
encoding_types.push_back(Filter::FILTER_TYPE_SDCH);
encoding_types.push_back(Filter::FILTER_TYPE_GZIP);
filter_context.SetMimeType("other/type");
Filter::FixupEncodingTypes(filter_context, &encoding_types);
ASSERT_EQ(2U, encoding_types.size());
EXPECT_EQ(Filter::FILTER_TYPE_SDCH, encoding_types[0]);
EXPECT_EQ(Filter::FILTER_TYPE_GZIP, encoding_types[1]);
// Solo SDCH is extended to include optional gunzip.
encoding_types.clear();
encoding_types.push_back(Filter::FILTER_TYPE_SDCH);
Filter::FixupEncodingTypes(filter_context, &encoding_types);
ASSERT_EQ(2U, encoding_types.size());
EXPECT_EQ(Filter::FILTER_TYPE_SDCH, encoding_types[0]);
EXPECT_EQ(Filter::FILTER_TYPE_GZIP_HELPING_SDCH, encoding_types[1]);
}
TEST(FilterTest, MissingSdchEncoding) {
// Handle interesting case where entire SDCH encoding assertion "got lost."
const std::string kTextHtmlMime("text/html");
MockFilterContext filter_context;
filter_context.SetSdchResponse(
SdchManager::CreateEmptyDictionarySetForTesting());
std::vector<Filter::FilterType> encoding_types;
// Loss of encoding, but it was an SDCH response with html type.
encoding_types.clear();
filter_context.SetMimeType(kTextHtmlMime);
Filter::FixupEncodingTypes(filter_context, &encoding_types);
ASSERT_EQ(2U, encoding_types.size());
EXPECT_EQ(Filter::FILTER_TYPE_SDCH_POSSIBLE, encoding_types[0]);
EXPECT_EQ(Filter::FILTER_TYPE_GZIP_HELPING_SDCH, encoding_types[1]);
// Loss of encoding, but it was an SDCH response with a prefix that says it
// was an html type. Note that it *should* be the case that a precise match
// with "text/html" we be collected by GetMimeType() and passed in, but we
// coded the fixup defensively (scanning for a prefix of "text/html", so this
// is an example which could survive such confusion in the caller).
encoding_types.clear();
filter_context.SetMimeType("text/html; charset=UTF-8");
Filter::FixupEncodingTypes(filter_context, &encoding_types);
ASSERT_EQ(2U, encoding_types.size());
EXPECT_EQ(Filter::FILTER_TYPE_SDCH_POSSIBLE, encoding_types[0]);
EXPECT_EQ(Filter::FILTER_TYPE_GZIP_HELPING_SDCH, encoding_types[1]);
// No encoding, but it was an SDCH response with non-html type.
encoding_types.clear();
filter_context.SetMimeType("other/mime");
Filter::FixupEncodingTypes(filter_context, &encoding_types);
ASSERT_EQ(2U, encoding_types.size());
EXPECT_EQ(Filter::FILTER_TYPE_SDCH_POSSIBLE, encoding_types[0]);
EXPECT_EQ(Filter::FILTER_TYPE_GZIP_HELPING_SDCH, encoding_types[1]);
}
// FixupEncodingTypes() should leave gzip encoding intact.
TEST(FilterTest, Gzip) {
const std::string kUrl("http://example.com/foo");
MockFilterContext filter_context;
std::vector<Filter::FilterType> encoding_types;
filter_context.SetURL(GURL(kUrl));
Filter::FixupEncodingTypes(filter_context, &encoding_types);
EXPECT_EQ(0U, encoding_types.size());
encoding_types.clear();
encoding_types.push_back(Filter::FILTER_TYPE_GZIP);
Filter::FixupEncodingTypes(filter_context, &encoding_types);
ASSERT_EQ(1U, encoding_types.size());
EXPECT_EQ(Filter::FILTER_TYPE_GZIP, encoding_types.front());
}
// Make sure a series of three pass-through filters copies the data cleanly.
// Regression test for http://crbug.com/418975.
TEST(FilterTest, ThreeFilterChain) {
scoped_ptr<PassThroughFilter> filter1(new PassThroughFilter);
scoped_ptr<PassThroughFilter> filter2(new PassThroughFilter);
scoped_ptr<PassThroughFilter> filter3(new PassThroughFilter);
filter1->InitBuffer(32 * 1024);
filter2->InitBuffer(32 * 1024);
filter3->InitBuffer(32 * 1024);
filter2->next_filter_ = std::move(filter3);
filter1->next_filter_ = std::move(filter2);
// Initialize the input array with a varying byte sequence.
const size_t input_array_size = 64 * 1024;
char input_array[input_array_size];
size_t read_array_index = 0;
for (size_t i = 0; i < input_array_size; i++) {
input_array[i] = i % 113;
}
const size_t output_array_size = 4 * 1024;
char output_array[output_array_size];
size_t compare_array_index = 0;
do {
// Read data from the filter chain.
int amount_read = output_array_size;
Filter::FilterStatus status = filter1->ReadData(output_array, &amount_read);
EXPECT_NE(Filter::FILTER_ERROR, status);
EXPECT_EQ(0, memcmp(output_array, input_array + compare_array_index,
amount_read));
compare_array_index += amount_read;
// Detect the various indications that data transfer along the chain is
// complete.
if (Filter::FILTER_DONE == status || Filter::FILTER_ERROR == status ||
(Filter::FILTER_OK == status && amount_read == 0) ||
(Filter::FILTER_NEED_MORE_DATA == status &&
read_array_index == input_array_size))
break;
if (Filter::FILTER_OK == status)
continue;
// Write needed data into the filter chain.
ASSERT_EQ(Filter::FILTER_NEED_MORE_DATA, status);
ASSERT_NE(0, filter1->stream_buffer_size());
size_t amount_to_copy = std::min(
static_cast<size_t>(filter1->stream_buffer_size()),
input_array_size - read_array_index);
memcpy(filter1->stream_buffer()->data(),
input_array + read_array_index,
amount_to_copy);
filter1->FlushStreamBuffer(amount_to_copy);
read_array_index += amount_to_copy;
} while (true);
EXPECT_EQ(read_array_index, input_array_size);
EXPECT_EQ(compare_array_index, input_array_size);
}
} // Namespace net
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