Add some validity testing for AccessBoundaryRules and add documentation.

google/downscope/downscoping_test.go

@@ -0,0 +1,56 @@
+package downscope
+
+import (
+	"context"
+	"golang.org/x/oauth2"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+var (
+	standardReqBody  = "grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Atoken-exchange&options=%257B%2522accessBoundary%2522%253A%257B%2522accessBoundaryRules%2522%253A%255B%257B%2522availableResource%2522%253A%2522test1%2522%252C%2522availablePermissions%2522%253A%255B%2522Perm1%252C%2Bperm2%2522%255D%257D%255D%257D%257D&requested_token_type=urn%3Aietf%3Aparams%3Aoauth%3Atoken-type%3Aaccess_token&subject_token=Mellon&subject_token_type=urn%3Aietf%3Aparams%3Aoauth%3Atoken-type%3Aaccess_token"
+	standardRespBody = `{"access_token":"Open Sesame","expires_in":432,"issued_token_type":"urn:ietf:params:oauth:token-type:access_token","token_type":"Bearer"}`
+)
+
+func Test_NewAccessBoundary(t *testing.T) {
+	got := AccessBoundary{make([]AccessBoundaryRule, 0)}
+	want := AccessBoundary{nil}
+	if got.AccessBoundaryRules == nil || len(got.AccessBoundaryRules) != 0 {
+		t.Errorf("NewAccessBoundary() = %v; want %v", got, want)
+	}
+}
+
+func Test_DownscopedTokenSource(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != "POST" {
+			t.Errorf("Unexpected request method, %v is found", r.Method)
+		}
+		if r.URL.String() != "/" {
+			t.Errorf("Unexpected request URL, %v is found", r.URL)
+		}
+		body, err := ioutil.ReadAll(r.Body)
+		if err != nil {
+			t.Fatalf("Failed to read request body: %v", err)
+		}
+		if got, want := string(body), standardReqBody; got != want {
+			t.Errorf("Unexpected exchange payload: got %v but want %v,", got, want)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		w.Write([]byte(standardRespBody))
+
+	}))
+	new := AccessBoundary{make([]AccessBoundaryRule, 0)}
+	new.AccessBoundaryRules = append(new.AccessBoundaryRules, AccessBoundaryRule{"test1", []string{"Perm1, perm2"}, nil})
+	myTok := oauth2.Token{AccessToken: "Mellon"}
+	tmpSrc := oauth2.StaticTokenSource(&myTok)
+	out, err := downscopedTokenWithEndpoint(context.Background(), DownscopingConfig{tmpSrc, new}, ts.URL)
+	if err != nil {
+		t.Fatalf("NewDownscopedTokenSource failed with error: %v", err)
+	}
+	_, err = out.Token()
+	if err != nil {
+		t.Fatalf("Token() call failed with error %v", err)
+	}
+}