41 lines
1 KiB
Go
41 lines
1 KiB
Go
package httpx
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import (
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"html/template"
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"net/http"
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)
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type HTMLHandler[T any] struct {
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Handler func(r *http.Request) (T, error)
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Template *template.Template // called with T
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}
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var htmlInternalServerErr = []byte(`<!DOCTYPE HTML><title>Internal Server Error</title>Internal Server Error`)
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var htmlNotFound = []byte(`<!DOCTYPE HTML><title>Not Found</title>Not Found`)
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// ServeHTTP calls j(r) and returns json
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func (h HTMLHandler[T]) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// call the function
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result, err := h.Handler(r)
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// entity not found
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if err == ErrNotFound {
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w.Header().Set("Content-Type", "text/html")
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w.WriteHeader(http.StatusNotFound)
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w.Write(htmlNotFound)
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return
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}
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// handle other errors
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if err != nil {
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w.Header().Set("Content-Type", "text/html")
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w.WriteHeader(http.StatusInternalServerError)
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w.Write(htmlInternalServerErr)
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return
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}
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// write out the response as json
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w.Header().Set("Content-Type", "text/html")
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w.WriteHeader(http.StatusOK)
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h.Template.Execute(w, result)
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}
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