3f3383dc0a
* Update makefile to use dep * Migrate to dep * Fix some deps * Try to find a better version for golang.org/x/net * Try to find a better version for golang.org/x/oauth2
76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
package openid
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
|
|
"golang.org/x/net/html"
|
|
)
|
|
|
|
func htmlDiscovery(id string, getter httpGetter) (opEndpoint, opLocalID, claimedID string, err error) {
|
|
resp, err := getter.Get(id, nil)
|
|
if err != nil {
|
|
return "", "", "", err
|
|
}
|
|
opEndpoint, opLocalID, err = findProviderFromHeadLink(resp.Body)
|
|
return opEndpoint, opLocalID, resp.Request.URL.String(), err
|
|
}
|
|
|
|
func findProviderFromHeadLink(input io.Reader) (opEndpoint, opLocalID string, err error) {
|
|
tokenizer := html.NewTokenizer(input)
|
|
inHead := false
|
|
for {
|
|
tt := tokenizer.Next()
|
|
switch tt {
|
|
case html.ErrorToken:
|
|
// Even if the document is malformed after we found a
|
|
// valid <link> tag, ignore and let's be happy with our
|
|
// openid2.provider and potentially openid2.local_id as well.
|
|
if len(opEndpoint) > 0 {
|
|
return
|
|
}
|
|
return "", "", tokenizer.Err()
|
|
case html.StartTagToken, html.EndTagToken, html.SelfClosingTagToken:
|
|
tk := tokenizer.Token()
|
|
if tk.Data == "head" {
|
|
if tt == html.StartTagToken {
|
|
inHead = true
|
|
} else {
|
|
if len(opEndpoint) > 0 {
|
|
return
|
|
}
|
|
return "", "", errors.New(
|
|
"LINK with rel=openid2.provider not found")
|
|
}
|
|
} else if inHead && tk.Data == "link" {
|
|
provider := false
|
|
localID := false
|
|
href := ""
|
|
for _, attr := range tk.Attr {
|
|
if attr.Key == "rel" {
|
|
if attr.Val == "openid2.provider" {
|
|
provider = true
|
|
} else if attr.Val == "openid2.local_id" {
|
|
localID = true
|
|
}
|
|
} else if attr.Key == "href" {
|
|
href = attr.Val
|
|
}
|
|
}
|
|
if provider && !localID && len(href) > 0 {
|
|
opEndpoint = href
|
|
} else if !provider && localID && len(href) > 0 {
|
|
opLocalID = href
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// At this point we should probably have returned either from
|
|
// a closing </head> or a tokenizer error (no </head> found).
|
|
// But just in case.
|
|
if len(opEndpoint) > 0 {
|
|
return
|
|
}
|
|
return "", "", errors.New("LINK rel=openid2.provider not found")
|
|
}
|