// InputNamed takes a (generally) user-provided input string and parses it into the out
// parameter, which must be settable (this usually means you'll have to pass a pointer
// to this function). See the documentation on Parse() for a list of the supported types.
// If name is provided, it will be included in any error returned by this function.
// Additional constraints might be specified with the tag parameter, the ones currently
// supported are:
// - required: Marks the field as required, will return an error if it's empty.
// - optional: Marks the field as optional, will accept empty values.
// - max_length: Sets the maximum length for the input.
// - min_length: Sets the minimum length for the input.
// - alphanumeric: Requires the input to be only letters and numbers
//
// Finally, the required parameter indicates if the value should be considered required
// or optional in absence of the "required" and "optional" tag fields.
func InputNamed(name string, input string, out interface{}, tag *structs.Tag, required bool) error {
v, err := types.SettableValue(out)
if err != nil {
return err
}
if err := parse(input, v); err != nil {
return err
}
if v.Type().Kind() != reflect.Bool && tag != nil {
if ((required && !tag.Optional()) || tag.Required()) && input == "" {
return RequiredInputError(name)
}
if maxlen, ok := tag.MaxLength(); ok && len(input) > maxlen {
if name != "" {
return i18n.Errorfc("form", "%s is too long (maximum length is %d)", name, maxlen)
}
return i18n.Errorfc("form", "too long (maximum length is %d)", maxlen)
}
if minlen, ok := tag.MinLength(); ok && len(input) < minlen {
if name != "" {
return i18n.Errorfc("form", "%s is too short (minimum length is %d)", name, minlen)
}
return i18n.Errorfc("form", "too short (minimum length is %d)", minlen)
}
if tag.Alphanumeric() && len(input) > 0 && !alphanumericRe.MatchString(input) {
if name != "" {
return i18n.Errorfc("form", "%s must be alphanumeric", name)
}
return i18n.Errorfc("form", "must be alphanumeric")
}
}
return nil
}
func (b *Backend) FieldType(typ reflect.Type, t *structs.Tag) (string, error) {
if c := codec.FromTag(t); c != nil {
if c.Binary || t.PipeName() != "" {
return "BLOB", nil
}
return "TEXT", nil
}
var ft string
switch typ.Kind() {
case reflect.Bool:
ft = "BOOL"
case reflect.Int8:
ft = "TINYINT"
case reflect.Uint8:
ft = "TINYINT UNSIGNED"
case reflect.Int16:
ft = "SMALLINT"
case reflect.Uint16:
ft = "SMALLINT UNSIGNED"
case reflect.Int32:
ft = "INT"
case reflect.Uint32:
ft = "INT UNSIGNED"
case reflect.Int, reflect.Int64:
ft = "BIGINT"
case reflect.Uint, reflect.Uint64:
ft = "BIGINT UNSIGNED"
case reflect.Float32:
ft = "FLOAT"
case reflect.Float64:
ft = "DOUBLE"
case reflect.String:
if ml, ok := t.MaxLength(); ok {
ft = fmt.Sprintf("VARCHAR (%d)", ml)
} else if fl, ok := t.Length(); ok {
ft = fmt.Sprintf("CHAR (%d)", fl)
} else {
ft = "TEXT"
}
case reflect.Slice:
etyp := typ.Elem()
if etyp.Kind() == reflect.Uint8 {
// []byte
ft = "BLOB"
}
case reflect.Struct:
if typ.Name() == "Time" && typ.PkgPath() == "time" {
ft = "DATETIME"
}
}
if ft != "" {
return ft, nil
}
return "", fmt.Errorf("can't map field type %v to a database type", typ)
}
func (b *Backend) FieldType(typ reflect.Type, t *structs.Tag) (string, error) {
if c := codec.FromTag(t); c != nil {
// TODO: Use type JSON on Postgresql >= 9.2 for JSON encoded fields
if c.Binary || t.PipeName() != "" {
return "BYTEA", nil
}
return "TEXT", nil
}
var ft string
switch typ.Kind() {
case reflect.Bool:
ft = "BOOL"
case reflect.Int8, reflect.Uint8, reflect.Int16:
ft = "INT2"
case reflect.Uint16, reflect.Int32:
ft = "INT4"
case reflect.Int, reflect.Uint, reflect.Uint32, reflect.Int64, reflect.Uint64:
ft = "INT8"
case reflect.Float32:
ft = "FLOAT4"
case reflect.Float64:
ft = "FLOAT8"
case reflect.String:
if t.Has("macaddr") {
ft = "MACADDR"
} else if t.Has("inet") {
ft = "INET"
} else {
if ml, ok := t.MaxLength(); ok {
ft = fmt.Sprintf("VARCHAR (%d)", ml)
} else if fl, ok := t.Length(); ok {
ft = fmt.Sprintf("CHAR (%d)", fl)
} else {
ft = "TEXT"
}
}
case reflect.Slice:
etyp := typ.Elem()
if etyp.Kind() == reflect.Uint8 {
// []byte
ft = "BYTEA"
// TODO: database/sql does not support array types. Enable this code
// if that changes in the future
// } else if typ.Elem().Kind() != reflect.Struct {
// et, err := b.FieldType(typ.Elem(), tag)
// if err != nil {
// return "", err
// }
// t = et + "[]"
}
case reflect.Struct:
if typ.Name() == "Time" && typ.PkgPath() == "time" {
ft = "TIMESTAMP WITHOUT TIME ZONE"
}
}
if t.Has("auto_increment") {
if strings.HasPrefix(ft, "INT") {
ft = strings.Replace(ft, "INT", "SERIAL", -1)
} else {
return "", fmt.Errorf("postgres does not support auto incrementing %v", typ)
}
}
if ft != "" {
return ft, nil
}
return "", fmt.Errorf("can't map field type %v to a database type", typ)
}