added context-value support

context.go

@@ -1128,3 +1128,18 @@ func (c *Context) Value(key interface{}) interface{} {
 	}
 	return nil
 }
+
+// ContextValue returns the context's value associated with the http request based on key, or nil
+// if no value is associated.
+func (c *Context) ContextValue(key interface{}) interface{} {
+	if key == 0 {
+		// to make sure the api(s) are consistent in behaviour; return the Request object instead of a nil.
+		// check the [Value] method's implementation (context.go).
+		return c.Request
+	}
+	if keyAsString, ok := key.(string); ok {
+		val := c.Request.Context().Value(keyAsString)
+		return val
+	}
+	return nil
+}

context_test.go

@@ -1960,3 +1960,22 @@ func TestContextWithKeysMutex(t *testing.T) {
 	assert.Nil(t, value)
 	assert.False(t, err)
 }
+
+func TestContextValueRequest(t *testing.T) {
+	w := httptest.NewRecorder()
+	c, _ := CreateTestContext(w)
+
+	c.Request, _ = http.NewRequest("GET", "/", nil)
+
+	// set the context value(s)
+	c1 := c.Request.Context()
+	c1 = context.WithValue(c1, interface{}("foo"), "bar")
+	c1 = context.WithValue(c1, interface{}("foo2"), "BAR2")
+
+	// set the context back to the request
+	c.Request = c.Request.WithContext(c1)
+
+	// testing
+	assert.Equal(t, "bar", c.ContextValue("foo"))
+	assert.Equal(t, "BAR2", c.ContextValue("foo2"))
+}

go.sum

@@ -26,6 +26,7 @@ github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 h1:Esafd1046DLD
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=