67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
package auth
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import (
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"fmt"
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"net/http"
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)
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type CallbackHandler struct {
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client *Client
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handler TokenHandler
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}
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var _ http.Handler = (*CallbackHandler)(nil)
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// CallbackHandler returns an http.Handler that handles callback responses
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// from the twitch authentication server.
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func (c *Client) CallbackHandler(h TokenHandler) http.Handler {
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return &CallbackHandler{
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client: c,
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handler: h,
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}
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}
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// ServeHTTP implements http.Handler.
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func (c *CallbackHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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q := r.URL.Query()
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state := q.Get("state")
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if state == "" {
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http.Error(w, "state is empty", http.StatusBadRequest)
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return
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}
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storedState, err := c.client.stateStorage.Get(r)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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if state != storedState {
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http.Error(w, "state mismatch", http.StatusBadRequest)
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return
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}
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if q.Has("error") {
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err := q.Get("error")
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desc := q.Get("error_description")
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errMsg := fmt.Sprintf("%s: %s", err, desc)
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http.Error(w, errMsg, http.StatusBadRequest)
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return
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}
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code := q.Get("code")
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scope := q.Get("scope")
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_ = scope
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token, err := c.client.GetToken(code)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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c.handler.Handle(state, token.AccessToken)
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}
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