core: Adds ExactScopeStrategy (#260)

The ExactScopeStrategy performs a simple string match (case sensitive)
of scopes.

scope_strategy.go

@@ -56,6 +56,16 @@ func HierarchicScopeStrategy(haystack []string, needle string) bool {
 	return false
 }
 
+func ExactScopeStrategy(haystack []string, needle string) bool {
+	for _, this := range haystack {
+		if needle == this {
+			return true
+		}
+	}
+
+	return false
+}
+
 func WildcardScopeStrategy(matchers []string, needle string) bool {
 	needleParts := strings.Split(needle, ".")
 	for _, matcher := range matchers {

scope_strategy_test.go

@@ -135,3 +135,19 @@ func TestWildcardScopeStrategy(t *testing.T) {
 	assert.True(t, strategy(scopes, "offline"))
 	assert.True(t, strategy(scopes, "openid"))
 }
+
+func TestExactScopeStrategy2ScopeStrategy(t *testing.T) {
+	var strategy ScopeStrategy = ExactScopeStrategy
+
+	scopes := []string{"foo.bar.baz", "foo.bar"}
+	assert.True(t, strategy(scopes, "foo.bar.baz"))
+	assert.True(t, strategy(scopes, "foo.bar"))
+
+	assert.False(t, strategy(scopes, "foo.bar.baz.baz"))
+	assert.False(t, strategy(scopes, "foo.bar.bar"))
+
+	assert.False(t, strategy(scopes, "foo.bar.baz1"))
+	assert.False(t, strategy(scopes, "foo.bar1"))
+
+	assert.False(t, strategy([]string{}, "foo"))
+}