83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
package main
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"net/http"
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"net/url"
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)
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func ssoRedirectHandler(w http.ResponseWriter, r *http.Request) {
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commenterToken := r.FormValue("commenterToken")
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domain := r.Header.Get("Referer")
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if commenterToken == "" {
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fmt.Fprintf(w, "Error: %s\n", errorMissingField.Error())
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return
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}
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domain = domainStrip(domain)
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if domain == "" {
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fmt.Fprintf(w, "Error: No Referer header found in request\n")
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return
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}
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_, err := commenterGetByCommenterToken(commenterToken)
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if err != nil && err != errorNoSuchToken {
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fmt.Fprintf(w, "Error: %s\n", err.Error())
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return
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}
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d, err := domainGet(domain)
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if err != nil {
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fmt.Fprintf(w, "Error: %s\n", errorNoSuchDomain.Error())
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return
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}
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if !d.SsoProvider {
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fmt.Fprintf(w, "Error: SSO not configured for %s\n", domain)
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return
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}
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if d.SsoSecret == "" || d.SsoUrl == "" {
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fmt.Fprintf(w, "Error: %s\n", errorMissingConfig.Error())
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return
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}
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key, err := hex.DecodeString(d.SsoSecret)
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if err != nil {
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logger.Errorf("cannot decode SSO secret as hex: %v", err)
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fmt.Fprintf(w, "Error: %s\n", err.Error())
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return
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}
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tokenBytes, err := hex.DecodeString(commenterToken)
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if err != nil {
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logger.Errorf("cannot decode hex commenterToken: %v", err)
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fmt.Fprintf(w, "Error: %s\n", errorInternal.Error())
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return
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}
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h := hmac.New(sha256.New, key)
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h.Write(tokenBytes)
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signature := hex.EncodeToString(h.Sum(nil))
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u, err := url.Parse(d.SsoUrl)
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if err != nil {
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// this should really not be happening; we're checking if the
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// passed URL is valid at domain update
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logger.Errorf("cannot parse URL: %v", err)
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fmt.Fprintf(w, "Error: %s\n", errorInternal.Error())
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return
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}
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q := u.Query()
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q.Set("token", commenterToken)
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q.Set("hmac", signature)
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u.RawQuery = q.Encode()
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http.Redirect(w, r, u.String(), http.StatusFound)
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}
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