Pronoun card website and API https://pronouns.cc
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pronouns.cc/backend/server/errors.go

129 lines
3.5 KiB

package server
import (
"fmt"
"net/http"
"codeberg.org/u1f320/pronouns.cc/backend/log"
"github.com/go-chi/render"
)
// WrapHandler wraps a modified http.HandlerFunc into a stdlib-compatible one.
// The inner HandlerFunc additionally returns an error.
func WrapHandler(hn func(w http.ResponseWriter, r *http.Request) error) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
err := hn(w, r)
if err != nil {
// if the function returned an API error, just render that verbatim
// we can assume that it also logged the error (if that was needed)
if apiErr, ok := err.(APIError); ok {
apiErr.prepare()
render.Status(r, apiErr.Status)
render.JSON(w, r, apiErr)
return
}
// otherwise, we log the error and return an internal server error message
log.Errorf("error in http handler: %v", err)
apiErr := APIError{Code: ErrInternalServerError}
apiErr.prepare()
render.Status(r, apiErr.Status)
render.JSON(w, r, apiErr)
}
}
}
// APIError is an object returned by the API when an error occurs.
// It implements the error interface and can be returned by handlers.
type APIError struct {
Code int `json:"code"`
Message string `json:"message,omitempty"`
Details string `json:"details,omitempty"`
RatelimitReset *int `json:"ratelimit_reset,omitempty"`
// Status is set as the HTTP status code.
Status int `json:"-"`
}
func (e APIError) Error() string {
return fmt.Sprintf("%s (code: %d)", e.Message, e.Code)
}
func (e *APIError) prepare() {
if e.Status == 0 {
e.Status = errCodeStatuses[e.Code]
}
if e.Message == "" {
e.Message = errCodeMessages[e.Code]
}
}
// Error code constants
const (
ErrBadRequest = 400
ErrForbidden = 403
ErrNotFound = 404
ErrMethodNotAllowed = 405
ErrTooManyRequests = 429
ErrInternalServerError = 500 // catch-all code for unknown errors
// Login/authorize error codes
ErrInvalidState = 1001
ErrInvalidOAuthCode = 1002
ErrInvalidToken = 1003 // a token was supplied, but it is invalid
// User-related error codes
ErrUserNotFound = 2001
// Member-related error codes
ErrMemberNotFound = 3001
ErrMemberLimitReached = 3002
// General request error codes
ErrRequestTooBig = 4001
)
var errCodeMessages = map[int]string{
ErrBadRequest: "Bad request",
ErrForbidden: "Forbidden",
ErrInternalServerError: "Internal server error",
ErrNotFound: "Not found",
ErrTooManyRequests: "Rate limit reached",
ErrMethodNotAllowed: "Method not allowed",
ErrInvalidState: "Invalid OAuth state",
ErrInvalidOAuthCode: "Invalid OAuth code",
ErrInvalidToken: "Supplied token was invalid",
ErrUserNotFound: "User not found",
ErrMemberNotFound: "Member not found",
ErrMemberLimitReached: "Member limit reached",
ErrRequestTooBig: "Request too big (max 2 MB)",
}
var errCodeStatuses = map[int]int{
ErrBadRequest: http.StatusBadRequest,
ErrForbidden: http.StatusForbidden,
ErrInternalServerError: http.StatusInternalServerError,
ErrNotFound: http.StatusNotFound,
ErrTooManyRequests: http.StatusTooManyRequests,
ErrMethodNotAllowed: http.StatusMethodNotAllowed,
ErrInvalidState: http.StatusBadRequest,
ErrInvalidOAuthCode: http.StatusForbidden,
ErrInvalidToken: http.StatusUnauthorized,
ErrUserNotFound: http.StatusNotFound,
ErrMemberNotFound: http.StatusNotFound,
ErrMemberLimitReached: http.StatusBadRequest,
ErrRequestTooBig: http.StatusBadRequest,
}