65 lines
2.3 KiB
Go
65 lines
2.3 KiB
Go
package handler
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import (
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"log"
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"net/http"
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)
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// badRequest is handled by setting the status code in the reply to StatusBadRequest.
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type badRequest struct{ error }
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// notFound is handled by setting the status code in the reply to StatusNotFound.
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type notFound struct{ error }
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// notAuthorized is handled by setting the status code in the reply to StatusNotAuthorized.
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type notAuthorized struct{ error }
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// notImplemented is handled by setting the status code in the reply to StatusNotImplemented.
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type notImplemented struct{ error }
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// forbidden is handled by setting the status code in the reply to StatusForbidden.
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type forbidden struct{ error }
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// internalServerError is handled by setting the status code in the reply to StatusInternalServerError.
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type internalServerError struct{ error }
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// errorHandler wraps a function returning an error by handling the error and returning a http.Handler.
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// If the error is of the one of the types defined above, it is handled as described for every type.
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// If the error is of another type, it is considered as an internal error and its message is logged.
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func errorHandler(f func(w http.ResponseWriter, r *http.Request) error) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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// standard header variables that should be set, for good measure.
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w.Header().Add("Cache-Control", "no-cache, no-store, max-age=0, must-revalidate")
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w.Header().Add("X-Frame-Options", "DENY")
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w.Header().Add("X-Content-Type-Options", "nosniff")
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w.Header().Add("X-XSS-Protection", "1; mode=block")
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// serve the request
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err := f(w, r)
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if err == nil {
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return
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}
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// log the url for debugging purposes
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log.Println(r.Method, r.URL.Path)
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switch err.(type) {
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case badRequest:
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log.Println(err)
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http.Error(w, err.Error(), http.StatusBadRequest)
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case notFound:
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http.Error(w, "Not Found", http.StatusNotFound)
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case notAuthorized:
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http.Error(w, "Not Authorized", http.StatusUnauthorized)
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case notImplemented:
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http.Error(w, "Not Implemented", http.StatusForbidden)
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case forbidden:
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http.Error(w, "Forbidden", http.StatusForbidden)
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case internalServerError:
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http.Error(w, "Internal Server Error", http.StatusInternalServerError)
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default:
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log.Println(err)
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http.Error(w, "oops", http.StatusInternalServerError)
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}
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}
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}
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