Submit prints out api error messages

cmd/submit.go

@@ -2,10 +2,12 @@ package cmd
 
 import (
 	"bytes"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
 	"mime/multipart"
+	"net/http"
 	"os"
 	"path/filepath"
 
@@ -249,6 +251,15 @@ func runSubmit(cfg config.Config, flags *pflag.FlagSet, args []string) error {
 	}
 	defer resp.Body.Close()
 
+	if resp.StatusCode == http.StatusBadRequest {
+		var jsonErrBody apiErrorMessage
+		if err := json.NewDecoder(resp.Body).Decode(&jsonErrBody); err != nil {
+			return fmt.Errorf("failed to parse error response - %s", err)
+		}
+
+		return fmt.Errorf(jsonErrBody.Error.Message)
+	}
+
 	bb := &bytes.Buffer{}
 	_, err = bb.ReadFrom(resp.Body)
 	if err != nil {
@@ -272,3 +283,10 @@ func runSubmit(cfg config.Config, flags *pflag.FlagSet, args []string) error {
 func init() {
 	RootCmd.AddCommand(submitCmd)
 }
+
+type apiErrorMessage struct {
+	Error struct {
+		Type    string `json:"type"`
+		Message string `json:"message"`
+	} `json:"error,omitempty"`
+}

cmd/submit_test.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
@@ -504,6 +505,8 @@ func fakeSubmitServer(t *testing.T, submittedFiles map[string]string) *httptest.
 			}
 			submittedFiles[fileHeader.Filename] = string(body)
 		}
+
+		fmt.Fprint(w, "{}")
 	})
 	return httptest.NewServer(handler)
 }
@@ -553,6 +556,46 @@ func TestSubmitRelativePath(t *testing.T) {
 	assert.Equal(t, "This is a file.", submittedFiles["file.txt"])
 }
 
+func TestSubmitServerErr(t *testing.T) {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, `{"error": {"type": "error", "message": "test error"}}`)
+	})
+
+	ts := httptest.NewServer(handler)
+	defer ts.Close()
+
+	tmpDir, err := ioutil.TempDir("", "submit-err-tmp-dir")
+	defer os.RemoveAll(tmpDir)
+	assert.NoError(t, err)
+
+	v := viper.New()
+	v.Set("token", "abc123")
+	v.Set("workspace", tmpDir)
+	v.Set("apibaseurl", ts.URL)
+
+	cfg := config.Config{
+		Persister:       config.InMemoryPersister{},
+		UserViperConfig: v,
+		DefaultBaseURL:  "http://example.com",
+	}
+
+	dir := filepath.Join(tmpDir, "bogus-track", "bogus-exercise")
+	os.MkdirAll(filepath.Join(dir, "subdir"), os.FileMode(0755))
+	writeFakeMetadata(t, dir, "bogus-track", "bogus-exercise")
+
+	err = ioutil.WriteFile(filepath.Join(dir, "file-1.txt"), []byte("This is file 1"), os.FileMode(0755))
+	assert.NoError(t, err)
+
+	files := []string{
+		filepath.Join(dir, "file-1.txt"),
+	}
+
+	err = runSubmit(cfg, pflag.NewFlagSet("fake", pflag.PanicOnError), files)
+
+	assert.Regexp(t, "test error", err.Error())
+}
+
 func TestSubmissionNotConnectedToRequesterAccount(t *testing.T) {
 	submittedFiles := map[string]string{}
 	ts := fakeSubmitServer(t, submittedFiles)