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dashboard/app: properly limit commit description length

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Ensure that we do not split UTF-8 rune in half.
Otherwise appengine python scripts will break badly.

R=adg, r
CC=golang-dev
https://golang.org/cl/42530043
This commit is contained in:
Dmitriy Vyukov 2013-12-17 12:14:27 +04:00
parent 9e3292f107
commit 676ac131e1
1 changed files with 19 additions and 3 deletions
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22
dashboard/app/build/handler.go
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@ -14,6 +14,7 @@ import (
"fmt"
"net/http"
"strings"
"unicode/utf8"
"appengine"
"appengine/datastore"
@ -57,9 +58,7 @@ func commitHandler(r *http.Request) (interface{}, error) {
if err := json.NewDecoder(r.Body).Decode(com); err != nil {
return nil, fmt.Errorf("decoding Body: %v", err)
}
if len(com.Desc) > maxDatastoreStringLen {
com.Desc = com.Desc[:maxDatastoreStringLen]
}
com.Desc = limitStringLength(com.Desc, maxDatastoreStringLen)
if err := com.Valid(); err != nil {
return nil, fmt.Errorf("validating Commit: %v", err)
}
@ -459,3 +458,20 @@ func logErr(w http.ResponseWriter, r *http.Request, err error) {
func contextForRequest(r *http.Request) appengine.Context {
return dashboardForRequest(r).Context(appengine.NewContext(r))
}
// limitStringLength essentially does return s[:max],
// but it ensures that we dot not split UTF-8 rune in half.
// Otherwise appengine python scripts will break badly.
func limitStringLength(s string, max int) string {
if len(s) <= max {
return s
}
for {
s = s[:max]
r, size := utf8.DecodeLastRuneInString(s)
if r != utf8.RuneError || size != 1 {
return s
}
max--
}
}