Fix formatting in MissingScopesError

api/client.go

@@ -3,7 +3,6 @@ package api
 import (
 	"bytes"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -155,7 +154,20 @@ func (err HTTPError) Error() string {
 }
 
 type MissingScopesError struct {
-	error
+	MissingScopes []string
+}
+
+func (e MissingScopesError) Error() string {
+	var missing []string
+	for _, s := range e.MissingScopes {
+		missing = append(missing, fmt.Sprintf("'%s'", s))
+	}
+	scopes := strings.Join(missing, ", ")
+
+	if len(e.MissingScopes) == 1 {
+		return "missing required scope " + scopes
+	}
+	return "missing required scopes " + scopes
 }
 
 func (c Client) HasMinimumScopes(hostname string) error {
@@ -183,31 +195,29 @@ func (c Client) HasMinimumScopes(hostname string) error {
 		return HandleHTTPError(res)
 	}
 
-	hasScopes := strings.Split(res.Header.Get("X-Oauth-Scopes"), ",")
+	scopesHeader := res.Header.Get("X-Oauth-Scopes")
 
 	search := map[string]bool{
 		"repo":      false,
 		"read:org":  false,
 		"admin:org": false,
 	}
-
-	for _, s := range hasScopes {
+	for _, s := range strings.Split(scopesHeader, ",") {
 		search[strings.TrimSpace(s)] = true
 	}
 
-	errorMsgs := []string{}
+	var missingScopes []string
 	if !search["repo"] {
-		errorMsgs = append(errorMsgs, "missing required scope 'repo'")
+		missingScopes = append(missingScopes, "repo")
 	}
 
 	if !search["read:org"] && !search["admin:org"] {
-		errorMsgs = append(errorMsgs, "missing required scope 'read:org'")
+		missingScopes = append(missingScopes, "read:org")
 	}
 
-	if len(errorMsgs) > 0 {
-		return &MissingScopesError{error: errors.New(strings.Join(errorMsgs, ";"))}
+	if len(missingScopes) > 0 {
+		return &MissingScopesError{MissingScopes: missingScopes}
 	}
-
 	return nil
 }
 

api/client_test.go

@@ -104,3 +104,62 @@ func TestRESTError(t *testing.T) {
 
 	}
 }
+
+func Test_HasMinimumScopes(t *testing.T) {
+	tests := []struct {
+		name    string
+		header  string
+		wantErr string
+	}{
+		{
+			name:    "default scopes",
+			header:  "repo, read:org",
+			wantErr: "",
+		},
+		{
+			name:    "admin:org satisfies read:org",
+			header:  "repo, admin:org",
+			wantErr: "",
+		},
+		{
+			name:    "insufficient scope",
+			header:  "repo",
+			wantErr: "missing required scope 'read:org'",
+		},
+		{
+			name:    "insufficient scopes",
+			header:  "gist",
+			wantErr: "missing required scopes 'repo', 'read:org'",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			fakehttp := &httpmock.Registry{}
+			client := NewClient(ReplaceTripper(fakehttp))
+
+			fakehttp.Register(httpmock.REST("GET", ""), func(req *http.Request) (*http.Response, error) {
+				return &http.Response{
+					Request:    req,
+					StatusCode: 200,
+					Body:       ioutil.NopCloser(&bytes.Buffer{}),
+					Header: map[string][]string{
+						"X-Oauth-Scopes": {tt.header},
+					},
+				}, nil
+			})
+
+			err := client.HasMinimumScopes("github.com")
+			if tt.wantErr == "" {
+				if err != nil {
+					t.Errorf("error: %v", err)
+				}
+				return
+			}
+			if err.Error() != tt.wantErr {
+				t.Errorf("want %q, got %q", tt.wantErr, err.Error())
+
+			}
+		})
+	}
+
+}