44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
// Package api implements the HTTP handlers for the messenger REST API.
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package api
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import (
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"encoding/json"
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"errors"
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"net/http"
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"messenger/internal/store"
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)
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func writeJSON(w http.ResponseWriter, status int, body any) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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if err := json.NewEncoder(w).Encode(body); err != nil {
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http.Error(w, `{"error":"failed to encode response"}`, http.StatusInternalServerError)
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}
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}
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func writeError(w http.ResponseWriter, status int, message string) {
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writeJSON(w, status, map[string]string{"error": message})
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}
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func writeStoreError(w http.ResponseWriter, err error) {
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switch {
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case errors.Is(err, store.ErrNotFound):
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writeError(w, http.StatusNotFound, "not found")
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case errors.Is(err, store.ErrDuplicate):
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writeError(w, http.StatusConflict, "already exists")
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default:
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writeError(w, http.StatusInternalServerError, "internal server error")
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}
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}
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// decodeJSON parses the request body into dst, rejecting oversized payloads.
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func decodeJSON(w http.ResponseWriter, r *http.Request, dst any) bool {
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r.Body = http.MaxBytesReader(w, r.Body, 1<<20)
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if err := json.NewDecoder(r.Body).Decode(dst); err != nil {
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writeError(w, http.StatusBadRequest, "invalid json")
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return false
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}
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return true
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}
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