122 lines
3.5 KiB
Go
122 lines
3.5 KiB
Go
package handlers
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import (
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"encoding/json"
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"fmt"
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"log"
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"net/http"
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"net/mail"
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"os"
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"regexp"
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"strings"
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"time"
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"github.com/kjannette/koin-ping/backend/internal/config"
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"github.com/kjannette/koin-ping/backend/internal/notifications"
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)
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const (
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maxSupportDescriptionLen = 8000
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maxSupportEmailLen = 320
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)
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var descriptionAllowedRE = regexp.MustCompile(`^[a-zA-Z0-9\s]+$`)
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type supportRequestBody struct {
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Email string `json:"email"`
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Description string `json:"description"`
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}
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// SupportHandler accepts authenticated support form submissions and emails the inbox.
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type SupportHandler struct {
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cfg *config.Config
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}
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func NewSupportHandler(cfg *config.Config) *SupportHandler {
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return &SupportHandler{cfg: cfg}
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}
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// Submit handles POST /support.
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func (h *SupportHandler) Submit(w http.ResponseWriter, r *http.Request) {
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var body supportRequestBody
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if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
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writeError(w, http.StatusBadRequest, "INVALID_JSON", "Request body must be JSON")
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return
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}
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email := strings.TrimSpace(body.Email)
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description := strings.TrimSpace(body.Description)
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if len(email) > maxSupportEmailLen {
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writeError(w, http.StatusBadRequest, "INVALID_EMAIL", "Email is too long")
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return
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}
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parsed, err := mail.ParseAddress(email)
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if err != nil || parsed.Address == "" {
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writeError(w, http.StatusBadRequest, "INVALID_EMAIL", "Invalid email address")
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return
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}
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canonicalEmail := parsed.Address
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if description == "" {
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writeError(w, http.StatusBadRequest, "INVALID_DESCRIPTION", "Description is required")
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return
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}
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if len(description) > maxSupportDescriptionLen {
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writeError(w, http.StatusBadRequest, "INVALID_DESCRIPTION", "Description is too long")
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return
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}
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if !descriptionAllowedRE.MatchString(description) {
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writeError(w, http.StatusBadRequest, "INVALID_DESCRIPTION",
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"Description may only contain letters, numbers, and whitespace")
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return
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}
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subject := time.Now().UTC().Format(time.RFC3339) + " - new support issue - koinp.ing"
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plainBody := "Contact email: " + canonicalEmail + "\n\nIssue description:\n" + description
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// Local dev: skip Resend when SUPPORT_DEV_SKIP_EMAIL=1 (see backend logs for payload).
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if strings.EqualFold(h.cfg.NodeEnv, "development") && os.Getenv("SUPPORT_DEV_SKIP_EMAIL") == "1" {
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log.Printf("[dev] SUPPORT_DEV_SKIP_EMAIL: skipping Resend; to=%s subject=%s", h.cfg.SupportInboxEmail, subject)
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log.Printf("[dev] SUPPORT_DEV_SKIP_EMAIL body:\n%s", plainBody)
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writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
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return
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}
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if h.cfg.ResendAPIKey == "" {
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log.Printf("support Submit: RESEND_API_KEY is empty")
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writeError(w, http.StatusServiceUnavailable, "EMAIL_UNAVAILABLE",
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supportUserFacingFallback(h.cfg.SupportInboxEmail))
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return
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}
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if err := notifications.SendSupportEmail(
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h.cfg.ResendAPIKey,
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h.cfg.EmailFrom,
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h.cfg.SupportInboxEmail,
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subject,
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plainBody,
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); err != nil {
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log.Printf("support Submit: Resend error (operator-facing): %v", err)
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msg := supportUserFacingFallback(h.cfg.SupportInboxEmail)
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if strings.EqualFold(h.cfg.NodeEnv, "development") {
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msg = "Email send failed (development): " + err.Error()
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}
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writeError(w, http.StatusInternalServerError, "SEND_FAILED", msg)
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return
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}
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writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
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}
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func supportUserFacingFallback(inbox string) string {
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return fmt.Sprintf(
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"We couldn't send your message from the form. Please try again in a few minutes, or email %s directly.",
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inbox,
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)
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}
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