api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/owner_reset_hex.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"net/http"
+	"time"
+)
+
+func ownerSendResetHex(email string) error {
+	if email == "" {
+		return errorMissingField
+	}
+
+	o, err := ownerGetByEmail(email)
+	if err != nil {
+		if err == errorNoSuchEmail {
+			// TODO: use a more random time instead.
+			time.Sleep(1 * time.Second)
+			return nil
+		} else {
+			logger.Errorf("cannot get owner by email: %v", err)
+			return errorInternal
+		}
+	}
+
+	if !smtpConfigured {
+		return errorSmtpNotConfigured
+	}
+
+	resetHex, err := randomHex(32)
+	if err != nil {
+		return err
+	}
+
+	statement := `
+		INSERT INTO
+		ownerResetHexes (resetHex, ownerHex, sendDate)
+		VALUES          ($1,       $2,    $3      );
+	`
+	_, err = db.Exec(statement, resetHex, o.OwnerHex, time.Now().UTC())
+	if err != nil {
+		logger.Errorf("cannot insert resetHex: %v", err)
+		return errorInternal
+	}
+
+	err = smtpOwnerResetHex(email, o.Name, resetHex)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func ownerSendResetHexHandler(w http.ResponseWriter, r *http.Request) {
+	type request struct {
+		Email *string `json:"email"`
+	}
+
+	var x request
+	if err := unmarshalBody(r, &x); err != nil {
+		writeBody(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	if err := ownerSendResetHex(*x.Email); err != nil {
+		writeBody(w, response{"success": false, "message": err.Error()})
+		return
+	}
+
+	writeBody(w, response{"success": true})
+}