mirror of
https://github.com/lyx0/nourybot.git
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115 lines
3.4 KiB
Go
115 lines
3.4 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"net/http"
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"strings"
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"github.com/julienschmidt/httprouter"
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)
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// func (app *application) readIDParam(r *http.Request) (int64, error) {
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// params := httprouter.ParamsFromContext(r.Context())
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//
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// // Use `ByName()` function to get the value of the "id" parameter from the slice.
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// // The value returned by `ByName()` is always a string so we try to convert it to
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// // base64 with a bit size of 64.
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// id, err := strconv.ParseInt(params.ByName("id"), 10, 64)
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// if err != nil || id < 1 {
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// return 0, errors.New("invalid id parameter")
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// }
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//
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// return id, nil
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// }
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func (app *application) readJSON(w http.ResponseWriter, r *http.Request, dst interface{}) error {
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// Limit the size of the requst body to 1MB.
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maxBytes := 1_048_576
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r.Body = http.MaxBytesReader(w, r.Body, int64(maxBytes))
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dec := json.NewDecoder(r.Body)
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dec.DisallowUnknownFields()
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err := dec.Decode(dst)
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if err != nil {
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var syntaxError *json.SyntaxError
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var unmarshalTypeError *json.UnmarshalTypeError
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var invalidUnmarshalError *json.InvalidUnmarshalError
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switch {
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case errors.As(err, &syntaxError):
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return fmt.Errorf("body contains malformed JSON (at character %d)", syntaxError.Offset)
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case errors.Is(err, io.ErrUnexpectedEOF):
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return errors.New("body contains invalid JSON")
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case errors.As(err, &unmarshalTypeError):
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if unmarshalTypeError.Field != "" {
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return fmt.Errorf("body contains invalid JSON type for field %q", unmarshalTypeError.Field)
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}
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return fmt.Errorf("body contains invalid JSON type (at character %d)", unmarshalTypeError.Offset)
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case errors.Is(err, io.EOF):
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return errors.New("body contains no data")
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case strings.HasPrefix(err.Error(), "json: unknown field "):
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fieldName := strings.TrimPrefix(err.Error(), "json: unknown field ")
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return fmt.Errorf("body contains unknown key %s", fieldName)
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case err.Error() == "htto: request body too large":
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return fmt.Errorf("body must not be larger than %d bytes", maxBytes)
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case errors.As(err, &invalidUnmarshalError):
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app.Logger.Panic(err)
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default:
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return err
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}
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}
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err = dec.Decode(&struct{}{})
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if err != io.EOF {
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return errors.New("body must only contain a single JSON value")
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}
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return nil
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}
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func (app *application) readCommandNameParam(r *http.Request) (string, error) {
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params := httprouter.ParamsFromContext(r.Context())
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// Use `ByName()` function to get the value of the "id" parameter from the slice.
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// The value returned by `ByName()` is always a string so we try to convert it to
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// base64 with a bit size of 64.
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name := params.ByName("name")
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return name, nil
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}
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func (app *application) writeJSON(w http.ResponseWriter, status int, data envelope, headers http.Header) error {
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// Encode the data into JSON and return any errors if there were any.
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// Use MarshalIndent instead of normal Marshal so it looks prettier on terminals.
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js, err := json.MarshalIndent(data, "", "\t")
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if err != nil {
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return err
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}
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// Append a newline to make it prettier on terminals.
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js = append(js, '\n')
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// Iterate over the header map and add each header to the
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// http.ResponseWriter header map.
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for key, value := range headers {
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w.Header()[key] = value
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}
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// Set `Content-Type` to `application/json` because go
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// defaults to `text-plain; charset=utf8`.
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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w.Write(js)
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return nil
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}
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