98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
package mstdn
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"sourcecode.social/reiver/go-opt"
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)
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func errorJSON(writer io.Writer, statusCode int, msg ...interface{}) {
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if nil == writer {
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return
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}
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// short error message.
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var short string
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{
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var shortErrorMessage opt.Optional[string]
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shortErrorMessage.WhenNothing(func(){
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if 1 <= len(msg) {
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shortErrorMessage = opt.Something(fmt.Sprint(msg[0]))
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}
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})
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shortErrorMessage.WhenNothing(func(){
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shortErrorMessage = opt.Something(http.StatusText(statusCode))
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})
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shortErrorMessage.WhenSomething(func(value string){
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short = value
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})
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}
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var long opt.Optional[string]
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{
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if 2 <= len(msg) {
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long = opt.Something(fmt.Sprint(msg[1:]...))
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}
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}
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var array [512]byte
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var buffer []byte = array[:0]
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{
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buffer = append(buffer, "{"...)
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buffer = append(buffer, `"error":`...)
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{
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// This should never return an error since we are passing a string.
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marshaled, _ := json.Marshal(short)
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buffer = append(buffer, marshaled...)
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}
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long.WhenSomething(func(value string){
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buffer = append(buffer, `,"error_description":`...)
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// This should never return an error since we are passing a string.
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marshaled, _ := json.Marshal(value)
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buffer = append(buffer, marshaled...)
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})
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buffer = append(buffer, "}"...)
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}
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writer.Write(buffer)
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}
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// Error responds to the request with the specified error message and HTTP code.
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// The response will be in JSON (application/json; charset=utf-8).
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//
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// For example:
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//
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// var statusCode int = http.StatusUnauthorized
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// var shortErrorMessage = http.StatusText(http.StatusUnauthorized)
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// var longErrorMessage = "Access Denied!!! — you can keep on knocking but you can't come in"
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//
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// mstdn.Error(resp, statusCode, shortErrorMessage, longErrorMessage)
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//
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// Responds with:
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//
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// {
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// "error":"Unauthorized",
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// "error_description":"Access Defined!!!! — you can keep on knocking but you can't come in"
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// }
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func Error(resp http.ResponseWriter, statusCode int, msg ...interface{}) {
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if nil == resp {
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return
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}
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resp.WriteHeader(statusCode)
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resp.Header().Add("Content-Type", "application/json; charset=utf-8")
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errorJSON(resp, statusCode, msg...)
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}
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