commit 5e5bd0cce147bfe1e077579abb33802978792cc5 Author: Arlo Breault arlolra@gmail.com Date: Wed Oct 2 21:02:55 2013 -0700

Prevent multiple response.WriteHeader calls.

HEAD requests were causing the template executer to warn about ErrBodyNotAllowed. The error handler was then trying to return a 500, but headers had already be written.

For now we'll just log errors. A better fix may be to buffer a response, then check for errors before writing it.

Closes #18 --- handlers.go | 13 +++++++------ utils.go | 22 ++++++++++------------ 2 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/handlers.go b/handlers.go index 39bb584..cef330d 100644 --- a/handlers.go +++ b/handlers.go @@ -3,6 +3,7 @@ package main import ( "fmt" "html/template" + "log" "net" "net/http" "time" @@ -53,8 +54,8 @@ func RootHandler(Layout *template.Template, Exits *Exits, Phttp *http.ServeMux)

// short circuit for torbutton if len(r.URL.Query().Get("TorButton")) > 0 { - if err := Layout.ExecuteTemplate(w, "torbutton.html", isTor); err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) + if err := Layout.ExecuteTemplate(w, "torbutton.html", isTor); err != nil && NotHeadErr(err) { + log.Printf("Layout.ExecuteTemplate: %v", err) } return } @@ -94,8 +95,8 @@ func RootHandler(Layout *template.Template, Exits *Exits, Phttp *http.ServeMux) }

// render the template - if err := Layout.ExecuteTemplate(w, "index.html", p); err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) + if err := Layout.ExecuteTemplate(w, "index.html", p); err != nil && NotHeadErr(err) { + log.Printf("Layout.ExecuteTemplate: %v", err) }

} @@ -109,8 +110,8 @@ func BulkHandler(Layout *template.Template, Exits *Exits) func(http.ResponseWrit

ip := q.Get("ip") if net.ParseIP(ip) == nil { - if err := Layout.ExecuteTemplate(w, "bulk.html", nil); err != nil { - http.Error(w, err.Error(), http.StatusInternalServerError) + if err := Layout.ExecuteTemplate(w, "bulk.html", nil); err != nil && NotHeadErr(err) { + log.Printf("Layout.ExecuteTemplate: %v", err) } return } diff --git a/utils.go b/utils.go index eb8a66d..d2ab661 100644 --- a/utils.go +++ b/utils.go @@ -9,9 +9,10 @@ import ( "io/ioutil" "log" "net/http" + "net/url" "os" "strconv" - "net/url" + "strings" )

func UpToDate(r *http.Request) bool { @@ -48,6 +49,11 @@ func GetQS(q url.Values, param string, deflt int) (num int, str string) { return }

+func NotHeadErr(err error) bool { + // should just be able to compare errors but executetemplate formats it + return !strings.Contains(err.Error(), http.ErrBodyNotAllowed.Error()) +} + func FuncMap(domain *gettext.Domain) template.FuncMap { return template.FuncMap{ "UnEscaped": func(x string) interface{} { @@ -65,27 +71,19 @@ func FuncMap(domain *gettext.Domain) template.FuncMap { var Layout *template.Template

func CompileTemplate(domain *gettext.Domain, templateName string) *template.Template { - var err error if Layout == nil { Layout = template.New("") Layout = Layout.Funcs(FuncMap(domain)) - Layout, err = Layout.ParseFiles( + Layout = template.Must(Layout.ParseFiles( "public/base.html", "public/torbutton.html", - ) - if err != nil { - log.Fatal(err) - } + )) } l, err := Layout.Clone() if err != nil { log.Fatal(err) } - l, err = l.ParseFiles("public/" + templateName) - if err != nil { - log.Fatal(err) - } - return l + return template.Must(l.ParseFiles("public/" + templateName)) }

type locale struct {