Provide method for returning certificate expiration timestamp.

webrtc/base/timeutils_unittest.cc

Index: webrtc/base/timeutils_unittest.cc
diff --git a/webrtc/base/timeutils_unittest.cc b/webrtc/base/timeutils_unittest.cc
index d1b9ad4f967c220a1274483d3fb8f8ccd42c41bd..952788e19b29435e6feafcf74c59ce6196260209 100644
--- a/webrtc/base/timeutils_unittest.cc
+++ b/webrtc/base/timeutils_unittest.cc
@@ -10,6 +10,7 @@
 
 #include "webrtc/base/common.h"
 #include "webrtc/base/gunit.h"
+#include "webrtc/base/helpers.h"
 #include "webrtc/base/thread.h"
 #include "webrtc/base/timeutils.h"
 
@@ -166,4 +167,85 @@ TEST_F(TimestampWrapAroundHandlerTest, Unwrap) {
   EXPECT_EQ(unwrapped_ts, wraparound_handler_.Unwrap(ts));
 }
 
+class TmToSeconds : public testing::Test {
+ public:
+  TmToSeconds() {
+    // Set use of the test RNG to get deterministic expiration timestamp.
+    rtc::SetRandomTestMode(true);
+  }
+  ~TmToSeconds() {
+    // Put it back for the next test.
+    rtc::SetRandomTestMode(false);
+  }
+
+  void TestTmToSeconds(int times) {
+    static char mdays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+    for (int i = 0; i < times; i++) {
+      std::tm tm;

[tommi, 2015/11/30 15:53:56]

declare where used

[torbjorng (webrtc), 2015/11/30 21:05:45]

Done.

+
+      // First generate something correct and check that TmToSeconds is happy.
+      int year = rtc::CreateRandomId() % 400 + 1970;
+
+      bool leap_year = false;
+      if (year % 4 == 0)
+        leap_year = true;
+      if (year % 100 == 0)

[tommi, 2015/11/30 15:53:56]

TIL!

[torbjorng (webrtc), 2015/11/30 21:05:45]

As you can see, this code is carefully designed to work past year 2400.  :-)

+        leap_year = false;
+      if (year % 400 == 0)
+        leap_year = true;
+
+      tm.tm_year = year - 1900;  // std::tm is year 1900 based.
+      tm.tm_mon = rtc::CreateRandomId() % 12;
+      tm.tm_mday = rtc::CreateRandomId() % mdays[tm.tm_mon] + 1;
+      tm.tm_hour = rtc::CreateRandomId() % 24;
+      tm.tm_min = rtc::CreateRandomId() % 60;
+      tm.tm_sec = rtc::CreateRandomId() % 60;
+      int64_t t = rtc::TmToSeconds(tm);
+      EXPECT_TRUE(t >= 0);
+
+      // Now damage a random field and check that TmToSeconds is unhappy.
+      switch (rtc::CreateRandomId() % 11) {
+        case 0:
+          tm.tm_year = 1969 - 1900;
+          break;
+        case 1:
+          tm.tm_mon = -1;
+          break;
+        case 2:
+          tm.tm_mon = 12;
+          break;
+        case 3:
+          tm.tm_mday = 0;
+          break;
+        case 4:
+          tm.tm_mday = mdays[tm.tm_mon] + (leap_year && tm.tm_mon == 1) + 1;
+          break;
+        case 5:
+          tm.tm_hour = -1;
+          break;
+        case 6:
+          tm.tm_hour = 24;
+          break;
+        case 7:
+          tm.tm_min = -1;
+          break;
+        case 8:
+          tm.tm_min = 60;
+          break;
+        case 9:
+          tm.tm_sec = -1;
+          break;
+        case 10:
+          tm.tm_sec = 60;
+          break;
+      }
+      EXPECT_EQ(rtc::TmToSeconds(tm), -1);
+    }
+  }
+};
+
+TEST_F(TmToSeconds, TestTmToSeconds) {
+  TestTmToSeconds(100000);
+}
+
 }  // namespace rtc