// proxyWebsocket copies data between websocket client and server until one side
// closes the connection. (ReverseProxy doesn't work with websocket requests.)
func proxyWebsocket(w http.ResponseWriter, r *http.Request, host string) {
d, err := net.Dial("tcp", host)
if err != nil {
http.Error(w, "Error contacting backend server.", 500)
glog.Errorf("Error dialing websocket backend %s: %v", host, err)
return
}
hj, ok := w.(http.Hijacker)
if !ok {
http.Error(w, "Not a hijacker?", 500)
return
}
nc, _, err := hj.Hijack()
if err != nil {
glog.Errorf("Hijack error: %v", err)
return
}
defer nc.Close()
defer d.Close()
err = r.Write(d)
if err != nil {
glog.Errorf("Error copying request to target: %v", err)
return
}
errc := make(chan error, 2)
cp := func(dst io.Writer, src io.Reader) {
_, err := io.Copy(dst, src)
errc <- err
}
go cp(d, nc)
go cp(nc, d)
<-errc
}
func (r *RenderTemplateResult) render(req *Request, resp *Response, wr io.Writer) {
err := r.Template.Execute(wr, r.RenderArgs)
if err == nil {
return
}
var templateContent []string
templateName, line, description := parseTemplateError(err)
if templateName == "" {
templateName = r.Template.Name()
templateContent = MainTemplateLoader.SourceLines(templateName)
} else {
if tmpl, _ := MainTemplateLoader.Template(templateName); tmpl != nil {
templateContent = MainTemplateLoader.SourceLines(templateName)
}
}
compileError := &Error{
Title: "Template Execution Error",
Path: templateName,
Description: description,
Line: line,
SourceLines: templateContent,
}
resp.Status = 500
glog.Errorf("Template Execution Error (in %s): %s", templateName, description)
ErrorResult{r.RenderArgs, compileError}.Apply(req, resp)
}
func Unbind(output map[string]string, name string, val interface{}) {
if binder, found := binderForType(reflect.TypeOf(val)); found {
if binder.Unbind != nil {
binder.Unbind(output, name, val)
} else {
glog.Errorf("revel/binder: can not unbind %s=%s", name, val)
}
}
}
func (c *Controller) RenderError(err error) Result {
// If it's a 5xx error, also log it to error.
status := c.Response.Status
if status == 0 {
status = http.StatusInternalServerError
}
if status/100 == 5 {
glog.Errorf("%d %s: %s", status, http.StatusText(status), err)
}
return ErrorResult{c.RenderArgs, err}
}
// Deserialize transforms bytes produced by Serialize back into a Go object,
// storing it into "ptr", which must be a pointer to the value type.
func Deserialize(byt []byte, ptr interface{}) (err error) {
if bytes, ok := ptr.(*[]byte); ok {
*bytes = byt
return
}
if v := reflect.ValueOf(ptr); v.Kind() == reflect.Ptr {
switch p := v.Elem(); p.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
var i int64
i, err = strconv.ParseInt(string(byt), 10, 64)
if err != nil {
glog.Errorf("revel/cache: failed to parse int '%s': %s", string(byt), err)
} else {
p.SetInt(i)
}
return
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
var i uint64
i, err = strconv.ParseUint(string(byt), 10, 64)
if err != nil {
glog.Errorf("revel/cache: failed to parse uint '%s': %s", string(byt), err)
} else {
p.SetUint(i)
}
return
}
}
b := bytes.NewBuffer(byt)
decoder := gob.NewDecoder(b)
if err = decoder.Decode(ptr); err != nil {
glog.Errorf("revel/cache: gob decoding failed: %s", err)
return
}
return
}
// Return nil if no match.
func (r *Route) Match(method string, reqPath string) *RouteMatch {
// Check the Method
if r.Method != "*" && method != r.Method && !(method == "HEAD" && r.Method == "GET") {
return nil
}
// Check the Path
var matches []string = r.pathPattern.FindStringSubmatch(reqPath)
if len(matches) == 0 || len(matches[0]) != len(reqPath) {
return nil
}
// Figure out the Param names.
params := make(map[string]string)
for i, m := range matches[1:] {
params[r.pathPattern.SubexpNames()[i+1]] = m
}
// If the action is variablized, replace into it with the captured args.
action := r.Action
if strings.Contains(action, "{") {
for key, value := range params {
action = strings.Replace(action, "{"+key+"}", value, -1)
}
}
// Special handling for explicit 404's.
if action == "404" {
return &RouteMatch{
Action: "404",
}
}
// Split the action into controller and method
actionSplit := strings.Split(action, ".")
if len(actionSplit) != 2 {
glog.Errorf("Failed to split action: %s (matching route: %s)", action, r.Action)
return nil
}
return &RouteMatch{
Action: action,
ControllerName: actionSplit[0],
MethodName: actionSplit[1],
Params: params,
FixedParams: r.FixedParams,
}
}
// Serialize transforms the given value into bytes following these rules:
// - If value is a byte array, it is returned as-is.
// - If value is an int or uint type, it is returned as the ASCII representation
// - Else, encoding/gob is used to serialize
func Serialize(value interface{}) ([]byte, error) {
if bytes, ok := value.([]byte); ok {
return bytes, nil
}
switch v := reflect.ValueOf(value); v.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return []byte(strconv.FormatInt(v.Int(), 10)), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return []byte(strconv.FormatUint(v.Uint(), 10)), nil
}
var b bytes.Buffer
encoder := gob.NewEncoder(&b)
if err := encoder.Encode(value); err != nil {
glog.Errorf("revel/cache: gob encoding '%s' failed: %s", value, err)
return nil, err
}
return b.Bytes(), nil
}
// This method handles requests for files. The supplied prefix may be absolute
// or relative. If the prefix is relative it is assumed to be relative to the
// application directory. The filepath may either be just a file or an
// additional filepath to search for the given file. This response may return
// the following responses in the event of an error or invalid request;
// 403(Forbidden): If the prefix filepath combination results in a directory.
// 404(Not found): If the prefix and filepath combination results in a non-existent file.
// 500(Internal Server Error): There are a few edge cases that would likely indicate some configuration error outside of revel.
//
// Note that when defining routes in routes/conf the parameters must not have
// spaces around the comma.
// Bad: Static.Serve("public/img", "favicon.png")
// Good: Static.Serve("public/img","favicon.png")
//
// Examples:
// Serving a directory
// Route (conf/routes):
// GET /public/{<.*>filepath} Static.Serve("public")
// Request:
// public/js/sessvars.js
// Calls
// Static.Serve("public","js/sessvars.js")
//
// Serving a file
// Route (conf/routes):
// GET /favicon.ico Static.Serve("public/img","favicon.png")
// Request:
// favicon.ico
// Calls:
// Static.Serve("public/img", "favicon.png")
func (c Static) Serve(prefix, filepath string) revel.Result {
// Fix for #503.
prefix = c.Params.Fixed.Get("prefix")
if prefix == "" {
return c.NotFound("")
}
var basePath string
if !fpath.IsAbs(prefix) {
basePath = revel.BasePath
}
basePathPrefix := fpath.Join(basePath, fpath.FromSlash(prefix))
fname := fpath.Join(basePathPrefix, fpath.FromSlash(filepath))
if !strings.HasPrefix(fname, basePathPrefix) {
glog.Warningf("Attempted to read file outside of base path: %s", fname)
return c.NotFound("")
}
finfo, err := os.Stat(fname)
if err != nil {
if os.IsNotExist(err) {
glog.Warningf("File not found (%s): %s ", fname, err)
return c.NotFound("File not found")
}
glog.Errorf("Error trying to get fileinfo for '%s': %s", fname, err)
return c.RenderError(err)
}
if finfo.Mode().IsDir() {
glog.Warningf("Attempted directory listing of %s", fname)
return c.Forbidden("Directory listing not allowed")
}
file, err := os.Open(fname)
return c.RenderFile(file, revel.Inline)
}
// Prepares the route to be used in matching.
func NewRoute(method, path, action, fixedArgs string) (r *Route) {
// Handle fixed arguments
argsReader := strings.NewReader(fixedArgs)
csv := csv.NewReader(argsReader)
fargs, err := csv.Read()
if err != nil && err != io.EOF {
glog.Errorf("Invalid fixed parameters (%v): for string '%v'", err.Error(), fixedArgs)
}
r = &Route{
Method: strings.ToUpper(method),
Path: path,
Action: action,
FixedParams: fargs,
}
// URL pattern
// TODO: Support non-absolute paths
if !strings.HasPrefix(r.Path, "/") {
glog.Error("Absolute URL required.")
return
}
// Handle embedded arguments
// Convert path arguments with unspecified regexes to standard form.
// e.g. "/customer/{id}" => "/customer/{<[^/]+>id}
normPath := nakedPathParamRegex.ReplaceAllStringFunc(r.Path, func(m string) string {
var argMatches []string = nakedPathParamRegex.FindStringSubmatch(m)
return "{<[^/]+>" + argMatches[1] + "}"
})
// Go through the arguments
r.args = make([]*arg, 0, 3)
for i, m := range argsPattern.FindAllStringSubmatch(normPath, -1) {
r.args = append(r.args, &arg{
name: string(m[2]),
index: i,
constraint: regexp.MustCompile(string(m[1])),
})
}
// Now assemble the entire path regex, including the embedded parameters.
// e.g. /app/{<[^/]+>id} => /app/(?P<id>[^/]+)
pathPatternStr := argsPattern.ReplaceAllStringFunc(normPath, func(m string) string {
var argMatches []string = argsPattern.FindStringSubmatch(m)
return "(?P<" + argMatches[2] + ">" + argMatches[1] + ")"
})
r.pathPattern = regexp.MustCompile(pathPatternStr + "$")
// Handle action
var actionPatternStr string = strings.Replace(r.Action, ".", `\.`, -1)
for _, arg := range r.args {
var argName string = "{" + arg.name + "}"
if argIndex := strings.Index(actionPatternStr, argName); argIndex != -1 {
actionPatternStr = strings.Replace(actionPatternStr, argName,
"(?P<"+arg.name+">"+arg.constraint.String()+")", -1)
}
}
r.actionPattern = regexp.MustCompile(actionPatternStr)
return
}
// Refresh scans the views directory and parses all templates using the
// configured TemplateEngines. If a template fails to parse, the error is set
// on the loader (and returned).
func (loader *TemplateLoader) Refresh() *Error {
glog.V(1).Infof("Refreshing templates from %s", loader.paths)
loader.compileError = nil
loader.templatePaths = map[string]string{}
// Set the template delimiters for the project if present, then split into left
// and right delimiters around a space character
var splitDelims []string
if delims := Config.StringDefault("template.delimiters", ""); delims != "" {
splitDelims = strings.Split(delims, " ")
if len(splitDelims) != 2 {
glog.Fatalln("app.conf: Incorrect format for template.delimiters")
}
}
loader.defaultEngine = NewTextTemplateEngine()
loader.engines = map[string]TemplateEngine{
".html": NewHtmlTemplateEngine(),
".xml": NewHtmlTemplateEngine(),
".json": NewTextTemplateEngine(),
".txt": NewTextTemplateEngine(),
}
// Walk through the template loader's paths and pass each template to the
// appropriate engine.
for _, basePath := range loader.paths {
// Walk only returns an error if the template loader is completely unusable
// (namely, if one of the TemplateFuncs does not have an acceptable signature).
funcErr := filepath.Walk(basePath, func(path string, info os.FileInfo, err error) (walkErr error) {
defer func() {
if err := recover(); err != nil {
walkErr = &Error{
Title: "Panic (Template Loader)",
Description: fmt.Sprintln(err),
}
}
}()
if err != nil {
glog.Errorln("error walking templates:", err)
return nil
}
// Walk into directories.
if info.IsDir() {
if !loader.WatchDir(info.Name()) {
return filepath.SkipDir
}
return nil
}
if !loader.WatchFile(info.Name()) {
return nil
}
// Convert template names to use forward slashes, even on Windows.
templateName := path[len(basePath)+1:]
if os.PathSeparator == '\\' {
templateName = strings.Replace(templateName, "\\", "/", -1)
}
// If we already loaded a template of this name, skip it.
if _, ok := loader.templatePaths[templateName]; ok {
return nil
}
loader.templatePaths[templateName] = path
fileBytes, err := ioutil.ReadFile(path)
if err != nil {
glog.Errorln("Failed reading file:", path)
return nil
}
ext := filepath.Ext(templateName)
engine, ok := loader.engines[ext]
if !ok {
engine = loader.defaultEngine
}
// If alternate delimiters set for the project, change them for this template.
if splitDelims != nil {
if strings.HasPrefix(path, ViewsPath) {
engine.Delims(splitDelims[0], splitDelims[1])
} else {
engine.Delims("", "")
}
}
err = engine.Parse(templateName, string(fileBytes))
// Store / report the first error encountered.
if err != nil && loader.compileError == nil {
_, line, description := parseTemplateError(err)
loader.compileError = &Error{
Title: "Template Compilation Error",
Path: templateName,
Description: description,
Line: line,
SourceLines: strings.Split(string(fileBytes), "\n"),
}
glog.Errorf("Template compilation error (In %s around line %d):\n%s",
templateName, line, description)
}
return nil
})
// If there was an error with the Funcs, set it and return immediately.
if funcErr != nil {
loader.compileError = funcErr.(*Error)
return loader.compileError
}
}
return loader.compileError
}
