// Handle writes the error from the context into the HttpResponseWriter with a
// 500 http.StatusInternalServerError status code.
func (h *DefaultErrorHandler) Handle(ctx context.Context) (stop bool, err error) {
var handlerError HandlerError = ctx.Data().Get(DataKeyForError).Data().(HandlerError)
hostname, _ := os.Hostname()
w := ctx.HttpResponseWriter()
// write the error out
w.Header().Set("Content-Type", "text/html")
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("<!DOCTYPE html><html><head>"))
w.Write([]byte("<style>"))
w.Write([]byte("h1 { font-size: 17px }"))
w.Write([]byte("h1 strong {text-decoration:underline}"))
w.Write([]byte("h2 { background-color: #ffd; padding: 20px }"))
w.Write([]byte("footer { margin-top: 20px; border-top:1px solid black; padding:10px; font-size:0.9em }"))
w.Write([]byte("</style>"))
w.Write([]byte("</head><body>"))
w.Write([]byte(fmt.Sprintf("<h1>Error in <code>%s</code></h1><h2>%s</h2>", handlerError.Handler, handlerError)))
w.Write([]byte(fmt.Sprintf("<h3><code>%s</code> error in Handler <code>%v</code></h3> <code><pre>%s</pre></code>", reflect.TypeOf(handlerError.OriginalError), &handlerError.Handler, handlerError.Handler)))
w.Write([]byte(fmt.Sprintf("on %s", hostname)))
w.Write([]byte("<footer>Learn more about <a href='http://github.com/stretchr/goweb' target='_blank'>Goweb</a></footer>"))
w.Write([]byte("</body></html>"))
// responses are actually ignored
return false, nil
}
// WillHandle checks whether this handler will be used to handle the specified
// request or not.
func (p *PathMatchHandler) WillHandle(c context.Context) (bool, error) {
// check each matcher func
matcherFuncMatches := true
matcherFuncDecisionMade := false
for _, matcherFunc := range p.MatcherFuncs {
decision, matcherFuncErr := matcherFunc(c)
if matcherFuncErr != nil {
return false, matcherFuncErr
}
switch decision {
case NoMatch:
matcherFuncMatches = false
matcherFuncDecisionMade = true
break
case Match:
matcherFuncMatches = true
matcherFuncDecisionMade = true
break
}
if matcherFuncDecisionMade {
break
}
}
// check HTTP methods
var httpMethodMatch bool = false
if len(p.HttpMethods) == 0 {
// no specific HTTP methods
httpMethodMatch = true
} else {
for _, httpMethod := range p.HttpMethods {
if httpMethod == c.MethodString() {
httpMethodMatch = true
break
}
}
}
// cancel early if we didn't get an HTTP Method match
if !httpMethodMatch {
return false, nil
}
// check path match
pathMatch := p.PathPattern.GetPathMatch(c.Path())
var allMatch bool
if matcherFuncDecisionMade {
allMatch = matcherFuncMatches
} else {
allMatch = pathMatch.Matches
}
if allMatch {
// save the match parameters for later
c.Data().Set(context.DataKeyPathParameters, pathMatch.Parameters)
}
return allMatch, nil
}