Modify data_reduction_proxy_header to support tamper detection logic.

components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc

Index: components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc
diff --git a/components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc b/components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc
index da438d8a21ecb13cd49c4df7dcb18f4012f3c48d..58d6537cd2d90eea7efc58727cd9005c3aef5eb4 100644
--- a/components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc
+++ b/components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc
@@ -24,6 +24,102 @@ namespace data_reduction_proxy {
 
 class DataReductionProxyHeadersTest : public testing::Test {};
 
+TEST_F(DataReductionProxyHeadersTest, GetDataReductionProxyActionValue) {
+  const struct {
+     const char* headers;
+     std::string action_key;
+     bool expected_result;
+     std::string expected_action_value;
+  } tests[] = {
+    { "HTTP/1.1 200 OK\n"
+      "Content-Length: 999\n",
+      "a",
+      false,
+      "",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Content-Length: 999\n",
+      "a",
+      false,
+      "",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=86400\n"
+      "Content-Length: 999\n",
+      "bypass",
+      true,
+      "86400",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass86400\n"
+      "Content-Length: 999\n",
+      "bypass",
+      false,
+      "",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=0\n"
+      "Content-Length: 999\n",
+      "bypass",
+      true,
+      "0",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=1500\n"
+      "Chrome-Proxy: bypass=86400\n"
+      "Content-Length: 999\n",
+      "bypass",
+      true,
+      "1500",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: block=1500, block=3600\n"
+      "Content-Length: 999\n",
+      "block",
+      true,
+      "1500",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: proxy-bypass\n"
+      "Chrome-Proxy:    key=123   \n"
+      "Content-Length: 999\n",
+      "key",
+      true,
+      "123",
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: proxy-bypass\n"
+      "Chrome-Proxy:    key=   \n"
+      "Content-Length: 999\n",
+      "key",
+      true,
+      "",
+    },
+  };
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    std::string headers(tests[i].headers);
+    HeadersToRaw(&headers);
+    scoped_refptr<net::HttpResponseHeaders> parsed(
+        new net::HttpResponseHeaders(headers));
+
+    std::string action_value;
+    bool has_action_key = GetDataReductionProxyActionValue(
+        parsed,
+        tests[i].action_key,
+        &action_value);
+    EXPECT_EQ(tests[i].expected_result, has_action_key);
+    if (has_action_key) {
+      EXPECT_EQ(tests[i].expected_action_value, action_value);
+    }
+  }
+}
+
 TEST_F(DataReductionProxyHeadersTest, GetProxyBypassInfo) {
   const struct {
      const char* headers;
@@ -195,75 +291,110 @@ TEST_F(DataReductionProxyHeadersTest, HasDataReductionProxyViaHeader) {
   const struct {
      const char* headers;
      bool expected_result;
+     bool expected_is_the_last;
   } tests[] = {
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Chrome-Proxy\n",
       false,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1\n",
       false,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Chrome-Compression-Proxy\n",
       true,
+      true,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.0 Chrome-Compression-Proxy\n",
       true,
+      true,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Foo-Bar, 1.1 Chrome-Compression-Proxy\n",
       true,
+      true,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Chrome-Compression-Proxy, 1.1 Bar-Foo\n",
       true,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 chrome-compression-proxy\n",
       false,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Foo-Bar\n"
       "Via: 1.1 Chrome-Compression-Proxy\n",
       true,
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n"
+      "Via: 1.1 Foo-Bar\n",
+      true,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Chrome-Proxy\n",
       false,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Chrome Compression Proxy\n",
       true,
+      true,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Foo-Bar, 1.1 Chrome Compression Proxy\n",
       true,
+      true,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Chrome Compression Proxy, 1.1 Bar-Foo\n",
       true,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 chrome compression proxy\n",
       false,
+      false,
     },
     { "HTTP/1.1 200 OK\n"
       "Via: 1.1 Foo-Bar\n"
       "Via: 1.1 Chrome Compression Proxy\n",
       true,
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome Compression Proxy\n"
+      "Via: 1.1 Foo-Bar\n",
+      true,
+      false,
     },
   };
+  bool has, is_the_last;
+  std::string headers;
+  scoped_refptr<net::HttpResponseHeaders> parsed;
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
-    std::string headers(tests[i].headers);
+    headers = tests[i].headers;
     HeadersToRaw(&headers);
-    scoped_refptr<net::HttpResponseHeaders> parsed(
-        new net::HttpResponseHeaders(headers));
+    parsed = new net::HttpResponseHeaders(headers);
 
-    EXPECT_EQ(tests[i].expected_result,
-              HasDataReductionProxyViaHeader(parsed));
+    has = HasDataReductionProxyViaHeader(parsed, &is_the_last);
+    EXPECT_EQ(tests[i].expected_result, has);
+    if (has) {
+      EXPECT_EQ(tests[i].expected_is_the_last, is_the_last);
+    }
   }
+
+  has = HasDataReductionProxyViaHeader(parsed, NULL);
+  EXPECT_EQ(tests[ARRAYSIZE_UNSAFE(tests) - 1].expected_result, has);
 }
 
 TEST_F(DataReductionProxyHeadersTest, GetDataReductionProxyBypassEventType) {