Commit ddd69d19 authored by Makpoc's avatar Makpoc

Add tests for fileserver.go

parent 8ecc3665
package middleware
import (
"errors"
"net/http"
"net/http/httptest"
"os"
"path/filepath"
"strings"
"testing"
)
var testDir = filepath.Join(os.TempDir(), "caddy_testdir")
var customErr = errors.New("Custom Error")
// testFiles is a map with relative paths to test files as keys and file content as values.
// The map represents the following structure:
// - $TEMP/caddy_testdir/
// '-- file1.html
// '-- dirwithindex/
// '---- index.html
// '-- dir/
// '---- file2.html
// '---- hidden.html
var testFiles = map[string]string{
"file1.html": "<h1>file1.html</h1>",
filepath.Join("dirwithindex", "index.html"): "<h1>dirwithindex/index.html</h1>",
filepath.Join("dir", "file2.html"): "<h1>dir/file2.html</h1>",
filepath.Join("dir", "hidden.html"): "<h1>dir/hidden.html</h1>",
}
// TestServeHTTP covers positive scenarios when serving files.
func TestServeHTTP(t *testing.T) {
beforeServeHttpTest(t)
defer afterServeHttpTest(t)
fileserver := FileServer(http.Dir(testDir), []string{"hidden.html"})
movedPermanently := "Moved Permanently"
tests := []struct {
url string
expectedStatus int
expectedBodyContent string
}{
// Test 0 - access withoutt any path
{
url: "https://foo",
expectedStatus: http.StatusNotFound,
},
// Test 1 - access root (without index.html)
{
url: "https://foo/",
expectedStatus: http.StatusNotFound,
},
// Test 2 - access existing file
{
url: "https://foo/file1.html",
expectedStatus: http.StatusOK,
expectedBodyContent: testFiles["file1.html"],
},
// Test 3 - access folder with index file with trailing slash
{
url: "https://foo/dirwithindex/",
expectedStatus: http.StatusOK,
expectedBodyContent: testFiles[filepath.Join("dirwithindex", "index.html")],
},
// Test 4 - access folder with index file without trailing slash
{
url: "https://foo/dirwithindex",
expectedStatus: http.StatusMovedPermanently,
expectedBodyContent: movedPermanently,
},
// Test 5 - access folder without index file
{
url: "https://foo/dir/",
expectedStatus: http.StatusNotFound,
},
// Test 6 - access folder withtout trailing slash
{
url: "https://foo/dir",
expectedStatus: http.StatusMovedPermanently,
expectedBodyContent: movedPermanently,
},
// Test 6 - access file with trailing slash
{
url: "https://foo/file1.html/",
expectedStatus: http.StatusMovedPermanently,
expectedBodyContent: movedPermanently,
},
// Test 7 - access not existing path
{
url: "https://foo/not_existing",
expectedStatus: http.StatusNotFound,
},
// Test 8 - access a file, marked as hidden
{
url: "https://foo/dir/hidden.html",
expectedStatus: http.StatusNotFound,
},
// Test 9 - access a index file directly
{
url: "https://foo/dirwithindex/index.html",
expectedStatus: http.StatusOK,
expectedBodyContent: testFiles[filepath.Join("dirwithindex", "index.html")],
},
// Test 10 - send a request with query params
{
url: "https://foo/dir?param1=val",
expectedStatus: http.StatusMovedPermanently,
expectedBodyContent: movedPermanently,
},
}
for i, test := range tests {
responseRecorder := httptest.NewRecorder()
request, err := http.NewRequest("GET", test.url, strings.NewReader(""))
status, err := fileserver.ServeHTTP(responseRecorder, request)
// check if error matches expectations
if err != nil {
t.Errorf(getTestPrefix(i)+"Serving file at %s failed. Error was: %v", test.url, err)
}
// check status code
if test.expectedStatus != status {
t.Errorf(getTestPrefix(i)+"Expected status %d, found %d", test.expectedStatus, status)
}
// check body content
if !strings.Contains(responseRecorder.Body.String(), test.expectedBodyContent) {
t.Errorf(getTestPrefix(i)+"Expected body to contain %q, found %q", test.expectedBodyContent, responseRecorder.Body.String())
}
}
}
// beforeServeHttpTest creates a test directory with the structure, defined in the variable testFiles
func beforeServeHttpTest(t *testing.T) {
// make the root test dir
err := os.Mkdir(testDir, os.ModePerm)
if err != nil {
if !os.IsExist(err) {
t.Fatalf("Failed to create test dir. Error was: %v", err)
return
}
}
for relFile, fileContent := range testFiles {
absFile := filepath.Join(testDir, relFile)
// make sure the parent directories exist
parentDir := filepath.Dir(absFile)
_, err = os.Stat(parentDir)
if err != nil {
os.MkdirAll(parentDir, os.ModePerm)
}
// now create the test files
f, err := os.Create(absFile)
if err != nil {
t.Fatalf("Failed to create test file %s. Error was: %v", absFile, err)
return
}
// and fill them with content
_, err = f.WriteString(fileContent)
if err != nil {
t.Fatal("Failed to write to %s. Error was: %v", absFile, err)
return
}
f.Close()
}
}
// afterServeHttpTest removes the test dir and all its content
func afterServeHttpTest(t *testing.T) {
// cleans up everything under the test dir. No need to clean the individual files.
err := os.RemoveAll(testDir)
if err != nil {
t.Fatalf("Failed to clean up test dir %s. Error was: %v", testDir, err)
}
}
// failingFS implements the http.FileSystem interface. The Open method always returns the error, assigned to err
type failingFS struct {
err error // the error to return when Open is called
fileImpl http.File // inject the file implementation
}
// Open returns the assigned failingFile and error
func (f failingFS) Open(path string) (http.File, error) {
return f.fileImpl, f.err
}
// failingFile implements http.File but returns a predefined error on every Stat() method call.
type failingFile struct {
http.File
err error
}
// Stat returns nil FileInfo and the provided error on every call
func (ff failingFile) Stat() (os.FileInfo, error) {
return nil, ff.err
}
// Close is noop and returns no error
func (ff failingFile) Close() error {
return nil
}
// TestServeHTTPFailingFS tests error cases where the Open function fails with various errors.
func TestServeHTTPFailingFS(t *testing.T) {
tests := []struct {
fsErr error
expectedStatus int
expectedErr error
expectedHeaders map[string]string
}{
{
fsErr: os.ErrNotExist,
expectedStatus: http.StatusNotFound,
expectedErr: nil,
},
{
fsErr: os.ErrPermission,
expectedStatus: http.StatusForbidden,
expectedErr: os.ErrPermission,
},
{
fsErr: customErr,
expectedStatus: http.StatusServiceUnavailable,
expectedErr: customErr,
expectedHeaders: map[string]string{"Retry-After": "5"},
},
}
for i, test := range tests {
// initialize a file server with the failing FileSystem
fileserver := FileServer(failingFS{err: test.fsErr}, nil)
// prepare the request and response
request, err := http.NewRequest("GET", "https://foo/", nil)
if err != nil {
t.Fatalf("Failed to build request. Error was: %v", err)
}
responseRecorder := httptest.NewRecorder()
status, actualErr := fileserver.ServeHTTP(responseRecorder, request)
// check the status
if status != test.expectedStatus {
t.Errorf(getTestPrefix(i)+"Expected status %d, found %d", test.expectedStatus, status)
}
// check the error
if actualErr != test.expectedErr {
t.Errorf(getTestPrefix(i)+"Expected err %v, found %v", test.expectedErr, actualErr)
}
// check the headers - a special case for server under load
if test.expectedHeaders != nil && len(test.expectedHeaders) > 0 {
for expectedKey, expectedVal := range test.expectedHeaders {
actualVal := responseRecorder.Header().Get(expectedKey)
if expectedVal != actualVal {
t.Errorf(getTestPrefix(i)+"Expected header %s: %s, found %s", expectedKey, expectedVal, actualVal)
}
}
}
}
}
// TestServeHTTPFailingStat tests error cases where the initial Open function succeeds, but the Stat method on the opened file fails.
func TestServeHTTPFailingStat(t *testing.T) {
tests := []struct {
statErr error
expectedStatus int
expectedErr error
}{
{
statErr: os.ErrNotExist,
expectedStatus: http.StatusNotFound,
expectedErr: nil,
},
{
statErr: os.ErrPermission,
expectedStatus: http.StatusForbidden,
expectedErr: os.ErrPermission,
},
{
statErr: customErr,
expectedStatus: http.StatusInternalServerError,
expectedErr: customErr,
},
}
for i, test := range tests {
// initialize a file server. The FileSystem will not fail, but calls to the Stat method of the returned File object will
fileserver := FileServer(failingFS{err: nil, fileImpl: failingFile{err: test.statErr}}, nil)
// prepare the request and response
request, err := http.NewRequest("GET", "https://foo/", nil)
if err != nil {
t.Fatalf("Failed to build request. Error was: %v", err)
}
responseRecorder := httptest.NewRecorder()
status, actualErr := fileserver.ServeHTTP(responseRecorder, request)
// check the status
if status != test.expectedStatus {
t.Errorf(getTestPrefix(i)+"Expected status %d, found %d", test.expectedStatus, status)
}
// check the error
if actualErr != test.expectedErr {
t.Errorf(getTestPrefix(i)+"Expected err %v, found %v", test.expectedErr, actualErr)
}
}
}
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