104 lines
3.0 KiB
Go
104 lines
3.0 KiB
Go
package common
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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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"net/url"
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"strconv"
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"strings"
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"party.at/party/internal/validator"
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)
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type envelope map[string]interface{}
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type apiError struct {
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Code ErrorCode `json:"code,omitempty"`
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Message string `json:"message"`
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Details map[string]string `json:"details,omitempty"`
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}
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// ── JSON helpers ─────────────────────────────────────────────────────────────
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func (app *Application) ReadJSON(w http.ResponseWriter, r *http.Request, dst interface{}) error {
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r.Body = http.MaxBytesReader(w, r.Body, 1048576)
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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 badly-formed 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 badly-formed 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 incorrect JSON type for field %q", unmarshalTypeError.Field)
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}
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return fmt.Errorf("body contains incorrect 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 must not be empty")
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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() == "http: request body too large":
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return fmt.Errorf("body must not be larger than 1048576 bytes")
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case errors.As(err, &invalidUnmarshalError):
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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 ReadIDParam(r *http.Request) (int64, error) {
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id, err := strconv.ParseInt(r.PathValue("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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return id, nil
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}
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func ReadString(qs url.Values, key, defaultValue string) string {
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if s := qs.Get(key); s != "" {
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return s
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}
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return defaultValue
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}
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func ReadInt(qs url.Values, key string, defaultValue int, v *validator.Validator) int {
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s := qs.Get(key)
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if s == "" {
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return defaultValue
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}
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i, err := strconv.Atoi(s)
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if err != nil {
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v.AddError(key, "must be an integer value")
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return defaultValue
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}
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return i
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}
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// ── Error responses ──────────────────────────────────────────────────────────
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func (app *Application) LogError(r *http.Request, err error) {
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app.Logger.PrintError(err, map[string]string{
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"request_method": r.Method,
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"request_url": r.URL.String(),
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})
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}
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