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package api
import (
"errors"
"fmt"
"net/http"
"strings"
"unicode"
"github.com/mediocregopher/blog.mediocregopher.com/srv/chat"
)
func (a *api) chatHistoryHandler() http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
limit, err := strToInt(r.FormValue("limit"), 0)
if err != nil {
badRequest(rw, r, fmt.Errorf("invalid limit parameter: %w", err))
return
}
cursor := r.FormValue("cursor")
cursor, msgs, err := a.params.GlobalRoom.History(r.Context(), chat.HistoryOpts{
Limit: limit,
Cursor: cursor,
})
if argErr := (chat.ErrInvalidArg{}); errors.As(err, &argErr) {
badRequest(rw, r, argErr.Err)
return
} else if err != nil {
internalServerError(rw, r, err)
}
jsonResult(rw, r, struct {
Cursor string `json:"cursor"`
Messages []chat.Message `json:"messages"`
}{
Cursor: cursor,
Messages: msgs,
})
})
}
func (a *api) getUserID(r *http.Request) (chat.UserID, error) {
name := r.PostFormValue("name")
if l := len(name); l == 0 {
return chat.UserID{}, errors.New("name is required")
} else if l > 16 {
return chat.UserID{}, errors.New("name too long")
}
nameClean := strings.Map(func(r rune) rune {
if !unicode.IsPrint(r) {
return -1
}
return r
}, name)
if nameClean != name {
return chat.UserID{}, errors.New("name contains invalid characters")
}
password := r.PostFormValue("password")
if l := len(password); l == 0 {
return chat.UserID{}, errors.New("password is required")
} else if l > 128 {
return chat.UserID{}, errors.New("password too long")
}
return a.params.UserIDCalculator.Calculate(name, password), nil
}
func (a *api) getUserIDHandler() http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
userID, err := a.getUserID(r)
if err != nil {
badRequest(rw, r, err)
return
}
jsonResult(rw, r, struct {
UserID chat.UserID `json:"userID"`
}{
UserID: userID,
})
})
}
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