package echo import ( "encoding" "encoding/json" "fmt" "net/http" "strconv" "strings" "time" ) /** Following functions provide handful of methods for binding to Go native types from request query or path parameters. * QueryParamsBinder(c) - binds query parameters (source URL) * PathParamsBinder(c) - binds path parameters (source URL) * FormFieldBinder(c) - binds form fields (source URL + body) Example: ```go var length int64 err := echo.QueryParamsBinder(c).Int64("length", &length).BindError() ``` For every supported type there are following methods: * ("param", &destination) - if parameter value exists then binds it to given destination of that type i.e Int64(...). * Must("param", &destination) - parameter value is required to exist, binds it to given destination of that type i.e MustInt64(...). * s("param", &destination) - (for slices) if parameter values exists then binds it to given destination of that type i.e Int64s(...). * Musts("param", &destination) - (for slices) parameter value is required to exist, binds it to given destination of that type i.e MustInt64s(...). for some slice types `BindWithDelimiter("param", &dest, ",")` supports splitting parameter values before type conversion is done i.e. URL `/api/search?id=1,2,3&id=1` can be bind to `[]int64{1,2,3,1}` `FailFast` flags binder to stop binding after first bind error during binder call chain. Enabled by default. `BindError()` returns first bind error from binder and resets errors in binder. Useful along with `FailFast()` method to do binding and returns on first problem `BindErrors()` returns all bind errors from binder and resets errors in binder. Types that are supported: * bool * float32 * float64 * int * int8 * int16 * int32 * int64 * uint * uint8/byte (does not support `bytes()`. Use BindUnmarshaler/CustomFunc to convert value from base64 etc to []byte{}) * uint16 * uint32 * uint64 * string * time * duration * BindUnmarshaler() interface * TextUnmarshaler() interface * JSONUnmarshaler() interface * UnixTime() - converts unix time (integer) to time.Time * UnixTimeMilli() - converts unix time with millisecond precision (integer) to time.Time * UnixTimeNano() - converts unix time with nanosecond precision (integer) to time.Time * CustomFunc() - callback function for your custom conversion logic. Signature `func(values []string) []error` */ // BindingError represents an error that occurred while binding request data. type BindingError struct { // Field is the field name where value binding failed Field string `json:"field"` // Values of parameter that failed to bind. Values []string `json:"-"` *HTTPError } // NewBindingError creates new instance of binding error func NewBindingError(sourceParam string, values []string, message interface{}, internalError error) error { return &BindingError{ Field: sourceParam, Values: values, HTTPError: &HTTPError{ Code: http.StatusBadRequest, Message: message, Internal: internalError, }, } } // Error returns error message func (be *BindingError) Error() string { return fmt.Sprintf("%s, field=%s", be.HTTPError.Error(), be.Field) } // ValueBinder provides utility methods for binding query or path parameter to various Go built-in types type ValueBinder struct { // failFast is flag for binding methods to return without attempting to bind when previous binding already failed failFast bool errors []error // ValueFunc is used to get single parameter (first) value from request ValueFunc func(sourceParam string) string // ValuesFunc is used to get all values for parameter from request. i.e. `/api/search?ids=1&ids=2` ValuesFunc func(sourceParam string) []string // ErrorFunc is used to create errors. Allows you to use your own error type, that for example marshals to your specific json response ErrorFunc func(sourceParam string, values []string, message interface{}, internalError error) error } // QueryParamsBinder creates query parameter value binder func QueryParamsBinder(c Context) *ValueBinder { return &ValueBinder{ failFast: true, ValueFunc: c.QueryParam, ValuesFunc: func(sourceParam string) []string { values, ok := c.QueryParams()[sourceParam] if !ok { return nil } return values }, ErrorFunc: NewBindingError, } } // PathParamsBinder creates path parameter value binder func PathParamsBinder(c Context) *ValueBinder { return &ValueBinder{ failFast: true, ValueFunc: c.Param, ValuesFunc: func(sourceParam string) []string { // path parameter should not have multiple values so getting values does not make sense but lets not error out here value := c.Param(sourceParam) if value == "" { return nil } return []string{value} }, ErrorFunc: NewBindingError, } } // FormFieldBinder creates form field value binder // For all requests, FormFieldBinder parses the raw query from the URL and uses query params as form fields // // For POST, PUT, and PATCH requests, it also reads the request body, parses it // as a form and uses query params as form fields. Request body parameters take precedence over URL query // string values in r.Form. // // NB: when binding forms take note that this implementation uses standard library form parsing // which parses form data from BOTH URL and BODY if content type is not MIMEMultipartForm // See https://golang.org/pkg/net/http/#Request.ParseForm func FormFieldBinder(c Context) *ValueBinder { vb := &ValueBinder{ failFast: true, ValueFunc: func(sourceParam string) string { return c.Request().FormValue(sourceParam) }, ErrorFunc: NewBindingError, } vb.ValuesFunc = func(sourceParam string) []string { if c.Request().Form == nil { // this is same as `Request().FormValue()` does internally _ = c.Request().ParseMultipartForm(32 << 20) } values, ok := c.Request().Form[sourceParam] if !ok { return nil } return values } return vb } // FailFast set internal flag to indicate if binding methods will return early (without binding) when previous bind failed // NB: call this method before any other binding methods as it modifies binding methods behaviour func (b *ValueBinder) FailFast(value bool) *ValueBinder { b.failFast = value return b } func (b *ValueBinder) setError(err error) { if b.errors == nil { b.errors = []error{err} return } b.errors = append(b.errors, err) } // BindError returns first seen bind error and resets/empties binder errors for further calls func (b *ValueBinder) BindError() error { if b.errors == nil { return nil } err := b.errors[0] b.errors = nil // reset errors so next chain will start from zero return err } // BindErrors returns all bind errors and resets/empties binder errors for further calls func (b *ValueBinder) BindErrors() []error { if b.errors == nil { return nil } errors := b.errors b.errors = nil // reset errors so next chain will start from zero return errors } // CustomFunc binds parameter values with Func. Func is called only when parameter values exist. func (b *ValueBinder) CustomFunc(sourceParam string, customFunc func(values []string) []error) *ValueBinder { return b.customFunc(sourceParam, customFunc, false) } // MustCustomFunc requires parameter values to exist to bind with Func. Returns error when value does not exist. func (b *ValueBinder) MustCustomFunc(sourceParam string, customFunc func(values []string) []error) *ValueBinder { return b.customFunc(sourceParam, customFunc, true) } func (b *ValueBinder) customFunc(sourceParam string, customFunc func(values []string) []error, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } if errs := customFunc(values); errs != nil { b.errors = append(b.errors, errs...) } return b } // String binds parameter to string variable func (b *ValueBinder) String(sourceParam string, dest *string) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { return b } *dest = value return b } // MustString requires parameter value to exist to bind to string variable. Returns error when value does not exist func (b *ValueBinder) MustString(sourceParam string, dest *string) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { b.setError(b.ErrorFunc(sourceParam, []string{value}, "required field value is empty", nil)) return b } *dest = value return b } // Strings binds parameter values to slice of string func (b *ValueBinder) Strings(sourceParam string, dest *[]string) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValuesFunc(sourceParam) if value == nil { return b } *dest = value return b } // MustStrings requires parameter values to exist to bind to slice of string variables. Returns error when value does not exist func (b *ValueBinder) MustStrings(sourceParam string, dest *[]string) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValuesFunc(sourceParam) if value == nil { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) return b } *dest = value return b } // BindUnmarshaler binds parameter to destination implementing BindUnmarshaler interface func (b *ValueBinder) BindUnmarshaler(sourceParam string, dest BindUnmarshaler) *ValueBinder { if b.failFast && b.errors != nil { return b } tmp := b.ValueFunc(sourceParam) if tmp == "" { return b } if err := dest.UnmarshalParam(tmp); err != nil { b.setError(b.ErrorFunc(sourceParam, []string{tmp}, "failed to bind field value to BindUnmarshaler interface", err)) } return b } // MustBindUnmarshaler requires parameter value to exist to bind to destination implementing BindUnmarshaler interface. // Returns error when value does not exist func (b *ValueBinder) MustBindUnmarshaler(sourceParam string, dest BindUnmarshaler) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { b.setError(b.ErrorFunc(sourceParam, []string{value}, "required field value is empty", nil)) return b } if err := dest.UnmarshalParam(value); err != nil { b.setError(b.ErrorFunc(sourceParam, []string{value}, "failed to bind field value to BindUnmarshaler interface", err)) } return b } // JSONUnmarshaler binds parameter to destination implementing json.Unmarshaler interface func (b *ValueBinder) JSONUnmarshaler(sourceParam string, dest json.Unmarshaler) *ValueBinder { if b.failFast && b.errors != nil { return b } tmp := b.ValueFunc(sourceParam) if tmp == "" { return b } if err := dest.UnmarshalJSON([]byte(tmp)); err != nil { b.setError(b.ErrorFunc(sourceParam, []string{tmp}, "failed to bind field value to json.Unmarshaler interface", err)) } return b } // MustJSONUnmarshaler requires parameter value to exist to bind to destination implementing json.Unmarshaler interface. // Returns error when value does not exist func (b *ValueBinder) MustJSONUnmarshaler(sourceParam string, dest json.Unmarshaler) *ValueBinder { if b.failFast && b.errors != nil { return b } tmp := b.ValueFunc(sourceParam) if tmp == "" { b.setError(b.ErrorFunc(sourceParam, []string{tmp}, "required field value is empty", nil)) return b } if err := dest.UnmarshalJSON([]byte(tmp)); err != nil { b.setError(b.ErrorFunc(sourceParam, []string{tmp}, "failed to bind field value to json.Unmarshaler interface", err)) } return b } // TextUnmarshaler binds parameter to destination implementing encoding.TextUnmarshaler interface func (b *ValueBinder) TextUnmarshaler(sourceParam string, dest encoding.TextUnmarshaler) *ValueBinder { if b.failFast && b.errors != nil { return b } tmp := b.ValueFunc(sourceParam) if tmp == "" { return b } if err := dest.UnmarshalText([]byte(tmp)); err != nil { b.setError(b.ErrorFunc(sourceParam, []string{tmp}, "failed to bind field value to encoding.TextUnmarshaler interface", err)) } return b } // MustTextUnmarshaler requires parameter value to exist to bind to destination implementing encoding.TextUnmarshaler interface. // Returns error when value does not exist func (b *ValueBinder) MustTextUnmarshaler(sourceParam string, dest encoding.TextUnmarshaler) *ValueBinder { if b.failFast && b.errors != nil { return b } tmp := b.ValueFunc(sourceParam) if tmp == "" { b.setError(b.ErrorFunc(sourceParam, []string{tmp}, "required field value is empty", nil)) return b } if err := dest.UnmarshalText([]byte(tmp)); err != nil { b.setError(b.ErrorFunc(sourceParam, []string{tmp}, "failed to bind field value to encoding.TextUnmarshaler interface", err)) } return b } // BindWithDelimiter binds parameter to destination by suitable conversion function. // Delimiter is used before conversion to split parameter value to separate values func (b *ValueBinder) BindWithDelimiter(sourceParam string, dest interface{}, delimiter string) *ValueBinder { return b.bindWithDelimiter(sourceParam, dest, delimiter, false) } // MustBindWithDelimiter requires parameter value to exist to bind destination by suitable conversion function. // Delimiter is used before conversion to split parameter value to separate values func (b *ValueBinder) MustBindWithDelimiter(sourceParam string, dest interface{}, delimiter string) *ValueBinder { return b.bindWithDelimiter(sourceParam, dest, delimiter, true) } func (b *ValueBinder) bindWithDelimiter(sourceParam string, dest interface{}, delimiter string, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } tmpValues := make([]string, 0, len(values)) for _, v := range values { tmpValues = append(tmpValues, strings.Split(v, delimiter)...) } switch d := dest.(type) { case *[]string: *d = tmpValues return b case *[]bool: return b.bools(sourceParam, tmpValues, d) case *[]int64, *[]int32, *[]int16, *[]int8, *[]int: return b.ints(sourceParam, tmpValues, d) case *[]uint64, *[]uint32, *[]uint16, *[]uint8, *[]uint: // *[]byte is same as *[]uint8 return b.uints(sourceParam, tmpValues, d) case *[]float64, *[]float32: return b.floats(sourceParam, tmpValues, d) case *[]time.Duration: return b.durations(sourceParam, tmpValues, d) default: // support only cases when destination is slice // does not support time.Time as it needs argument (layout) for parsing or BindUnmarshaler b.setError(b.ErrorFunc(sourceParam, []string{}, "unsupported bind type", nil)) return b } } // Int64 binds parameter to int64 variable func (b *ValueBinder) Int64(sourceParam string, dest *int64) *ValueBinder { return b.intValue(sourceParam, dest, 64, false) } // MustInt64 requires parameter value to exist to bind to int64 variable. Returns error when value does not exist func (b *ValueBinder) MustInt64(sourceParam string, dest *int64) *ValueBinder { return b.intValue(sourceParam, dest, 64, true) } // Int32 binds parameter to int32 variable func (b *ValueBinder) Int32(sourceParam string, dest *int32) *ValueBinder { return b.intValue(sourceParam, dest, 32, false) } // MustInt32 requires parameter value to exist to bind to int32 variable. Returns error when value does not exist func (b *ValueBinder) MustInt32(sourceParam string, dest *int32) *ValueBinder { return b.intValue(sourceParam, dest, 32, true) } // Int16 binds parameter to int16 variable func (b *ValueBinder) Int16(sourceParam string, dest *int16) *ValueBinder { return b.intValue(sourceParam, dest, 16, false) } // MustInt16 requires parameter value to exist to bind to int16 variable. Returns error when value does not exist func (b *ValueBinder) MustInt16(sourceParam string, dest *int16) *ValueBinder { return b.intValue(sourceParam, dest, 16, true) } // Int8 binds parameter to int8 variable func (b *ValueBinder) Int8(sourceParam string, dest *int8) *ValueBinder { return b.intValue(sourceParam, dest, 8, false) } // MustInt8 requires parameter value to exist to bind to int8 variable. Returns error when value does not exist func (b *ValueBinder) MustInt8(sourceParam string, dest *int8) *ValueBinder { return b.intValue(sourceParam, dest, 8, true) } // Int binds parameter to int variable func (b *ValueBinder) Int(sourceParam string, dest *int) *ValueBinder { return b.intValue(sourceParam, dest, 0, false) } // MustInt requires parameter value to exist to bind to int variable. Returns error when value does not exist func (b *ValueBinder) MustInt(sourceParam string, dest *int) *ValueBinder { return b.intValue(sourceParam, dest, 0, true) } func (b *ValueBinder) intValue(sourceParam string, dest interface{}, bitSize int, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } return b.int(sourceParam, value, dest, bitSize) } func (b *ValueBinder) int(sourceParam string, value string, dest interface{}, bitSize int) *ValueBinder { n, err := strconv.ParseInt(value, 10, bitSize) if err != nil { if bitSize == 0 { b.setError(b.ErrorFunc(sourceParam, []string{value}, "failed to bind field value to int", err)) } else { b.setError(b.ErrorFunc(sourceParam, []string{value}, fmt.Sprintf("failed to bind field value to int%v", bitSize), err)) } return b } switch d := dest.(type) { case *int64: *d = n case *int32: *d = int32(n) case *int16: *d = int16(n) case *int8: *d = int8(n) case *int: *d = int(n) } return b } func (b *ValueBinder) intsValue(sourceParam string, dest interface{}, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, values, "required field value is empty", nil)) } return b } return b.ints(sourceParam, values, dest) } func (b *ValueBinder) ints(sourceParam string, values []string, dest interface{}) *ValueBinder { switch d := dest.(type) { case *[]int64: tmp := make([]int64, len(values)) for i, v := range values { b.int(sourceParam, v, &tmp[i], 64) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]int32: tmp := make([]int32, len(values)) for i, v := range values { b.int(sourceParam, v, &tmp[i], 32) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]int16: tmp := make([]int16, len(values)) for i, v := range values { b.int(sourceParam, v, &tmp[i], 16) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]int8: tmp := make([]int8, len(values)) for i, v := range values { b.int(sourceParam, v, &tmp[i], 8) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]int: tmp := make([]int, len(values)) for i, v := range values { b.int(sourceParam, v, &tmp[i], 0) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } } return b } // Int64s binds parameter to slice of int64 func (b *ValueBinder) Int64s(sourceParam string, dest *[]int64) *ValueBinder { return b.intsValue(sourceParam, dest, false) } // MustInt64s requires parameter value to exist to bind to int64 slice variable. Returns error when value does not exist func (b *ValueBinder) MustInt64s(sourceParam string, dest *[]int64) *ValueBinder { return b.intsValue(sourceParam, dest, true) } // Int32s binds parameter to slice of int32 func (b *ValueBinder) Int32s(sourceParam string, dest *[]int32) *ValueBinder { return b.intsValue(sourceParam, dest, false) } // MustInt32s requires parameter value to exist to bind to int32 slice variable. Returns error when value does not exist func (b *ValueBinder) MustInt32s(sourceParam string, dest *[]int32) *ValueBinder { return b.intsValue(sourceParam, dest, true) } // Int16s binds parameter to slice of int16 func (b *ValueBinder) Int16s(sourceParam string, dest *[]int16) *ValueBinder { return b.intsValue(sourceParam, dest, false) } // MustInt16s requires parameter value to exist to bind to int16 slice variable. Returns error when value does not exist func (b *ValueBinder) MustInt16s(sourceParam string, dest *[]int16) *ValueBinder { return b.intsValue(sourceParam, dest, true) } // Int8s binds parameter to slice of int8 func (b *ValueBinder) Int8s(sourceParam string, dest *[]int8) *ValueBinder { return b.intsValue(sourceParam, dest, false) } // MustInt8s requires parameter value to exist to bind to int8 slice variable. Returns error when value does not exist func (b *ValueBinder) MustInt8s(sourceParam string, dest *[]int8) *ValueBinder { return b.intsValue(sourceParam, dest, true) } // Ints binds parameter to slice of int func (b *ValueBinder) Ints(sourceParam string, dest *[]int) *ValueBinder { return b.intsValue(sourceParam, dest, false) } // MustInts requires parameter value to exist to bind to int slice variable. Returns error when value does not exist func (b *ValueBinder) MustInts(sourceParam string, dest *[]int) *ValueBinder { return b.intsValue(sourceParam, dest, true) } // Uint64 binds parameter to uint64 variable func (b *ValueBinder) Uint64(sourceParam string, dest *uint64) *ValueBinder { return b.uintValue(sourceParam, dest, 64, false) } // MustUint64 requires parameter value to exist to bind to uint64 variable. Returns error when value does not exist func (b *ValueBinder) MustUint64(sourceParam string, dest *uint64) *ValueBinder { return b.uintValue(sourceParam, dest, 64, true) } // Uint32 binds parameter to uint32 variable func (b *ValueBinder) Uint32(sourceParam string, dest *uint32) *ValueBinder { return b.uintValue(sourceParam, dest, 32, false) } // MustUint32 requires parameter value to exist to bind to uint32 variable. Returns error when value does not exist func (b *ValueBinder) MustUint32(sourceParam string, dest *uint32) *ValueBinder { return b.uintValue(sourceParam, dest, 32, true) } // Uint16 binds parameter to uint16 variable func (b *ValueBinder) Uint16(sourceParam string, dest *uint16) *ValueBinder { return b.uintValue(sourceParam, dest, 16, false) } // MustUint16 requires parameter value to exist to bind to uint16 variable. Returns error when value does not exist func (b *ValueBinder) MustUint16(sourceParam string, dest *uint16) *ValueBinder { return b.uintValue(sourceParam, dest, 16, true) } // Uint8 binds parameter to uint8 variable func (b *ValueBinder) Uint8(sourceParam string, dest *uint8) *ValueBinder { return b.uintValue(sourceParam, dest, 8, false) } // MustUint8 requires parameter value to exist to bind to uint8 variable. Returns error when value does not exist func (b *ValueBinder) MustUint8(sourceParam string, dest *uint8) *ValueBinder { return b.uintValue(sourceParam, dest, 8, true) } // Byte binds parameter to byte variable func (b *ValueBinder) Byte(sourceParam string, dest *byte) *ValueBinder { return b.uintValue(sourceParam, dest, 8, false) } // MustByte requires parameter value to exist to bind to byte variable. Returns error when value does not exist func (b *ValueBinder) MustByte(sourceParam string, dest *byte) *ValueBinder { return b.uintValue(sourceParam, dest, 8, true) } // Uint binds parameter to uint variable func (b *ValueBinder) Uint(sourceParam string, dest *uint) *ValueBinder { return b.uintValue(sourceParam, dest, 0, false) } // MustUint requires parameter value to exist to bind to uint variable. Returns error when value does not exist func (b *ValueBinder) MustUint(sourceParam string, dest *uint) *ValueBinder { return b.uintValue(sourceParam, dest, 0, true) } func (b *ValueBinder) uintValue(sourceParam string, dest interface{}, bitSize int, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } return b.uint(sourceParam, value, dest, bitSize) } func (b *ValueBinder) uint(sourceParam string, value string, dest interface{}, bitSize int) *ValueBinder { n, err := strconv.ParseUint(value, 10, bitSize) if err != nil { if bitSize == 0 { b.setError(b.ErrorFunc(sourceParam, []string{value}, "failed to bind field value to uint", err)) } else { b.setError(b.ErrorFunc(sourceParam, []string{value}, fmt.Sprintf("failed to bind field value to uint%v", bitSize), err)) } return b } switch d := dest.(type) { case *uint64: *d = n case *uint32: *d = uint32(n) case *uint16: *d = uint16(n) case *uint8: // byte is alias to uint8 *d = uint8(n) case *uint: *d = uint(n) } return b } func (b *ValueBinder) uintsValue(sourceParam string, dest interface{}, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, values, "required field value is empty", nil)) } return b } return b.uints(sourceParam, values, dest) } func (b *ValueBinder) uints(sourceParam string, values []string, dest interface{}) *ValueBinder { switch d := dest.(type) { case *[]uint64: tmp := make([]uint64, len(values)) for i, v := range values { b.uint(sourceParam, v, &tmp[i], 64) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]uint32: tmp := make([]uint32, len(values)) for i, v := range values { b.uint(sourceParam, v, &tmp[i], 32) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]uint16: tmp := make([]uint16, len(values)) for i, v := range values { b.uint(sourceParam, v, &tmp[i], 16) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]uint8: // byte is alias to uint8 tmp := make([]uint8, len(values)) for i, v := range values { b.uint(sourceParam, v, &tmp[i], 8) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]uint: tmp := make([]uint, len(values)) for i, v := range values { b.uint(sourceParam, v, &tmp[i], 0) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } } return b } // Uint64s binds parameter to slice of uint64 func (b *ValueBinder) Uint64s(sourceParam string, dest *[]uint64) *ValueBinder { return b.uintsValue(sourceParam, dest, false) } // MustUint64s requires parameter value to exist to bind to uint64 slice variable. Returns error when value does not exist func (b *ValueBinder) MustUint64s(sourceParam string, dest *[]uint64) *ValueBinder { return b.uintsValue(sourceParam, dest, true) } // Uint32s binds parameter to slice of uint32 func (b *ValueBinder) Uint32s(sourceParam string, dest *[]uint32) *ValueBinder { return b.uintsValue(sourceParam, dest, false) } // MustUint32s requires parameter value to exist to bind to uint32 slice variable. Returns error when value does not exist func (b *ValueBinder) MustUint32s(sourceParam string, dest *[]uint32) *ValueBinder { return b.uintsValue(sourceParam, dest, true) } // Uint16s binds parameter to slice of uint16 func (b *ValueBinder) Uint16s(sourceParam string, dest *[]uint16) *ValueBinder { return b.uintsValue(sourceParam, dest, false) } // MustUint16s requires parameter value to exist to bind to uint16 slice variable. Returns error when value does not exist func (b *ValueBinder) MustUint16s(sourceParam string, dest *[]uint16) *ValueBinder { return b.uintsValue(sourceParam, dest, true) } // Uint8s binds parameter to slice of uint8 func (b *ValueBinder) Uint8s(sourceParam string, dest *[]uint8) *ValueBinder { return b.uintsValue(sourceParam, dest, false) } // MustUint8s requires parameter value to exist to bind to uint8 slice variable. Returns error when value does not exist func (b *ValueBinder) MustUint8s(sourceParam string, dest *[]uint8) *ValueBinder { return b.uintsValue(sourceParam, dest, true) } // Uints binds parameter to slice of uint func (b *ValueBinder) Uints(sourceParam string, dest *[]uint) *ValueBinder { return b.uintsValue(sourceParam, dest, false) } // MustUints requires parameter value to exist to bind to uint slice variable. Returns error when value does not exist func (b *ValueBinder) MustUints(sourceParam string, dest *[]uint) *ValueBinder { return b.uintsValue(sourceParam, dest, true) } // Bool binds parameter to bool variable func (b *ValueBinder) Bool(sourceParam string, dest *bool) *ValueBinder { return b.boolValue(sourceParam, dest, false) } // MustBool requires parameter value to exist to bind to bool variable. Returns error when value does not exist func (b *ValueBinder) MustBool(sourceParam string, dest *bool) *ValueBinder { return b.boolValue(sourceParam, dest, true) } func (b *ValueBinder) boolValue(sourceParam string, dest *bool, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } return b.bool(sourceParam, value, dest) } func (b *ValueBinder) bool(sourceParam string, value string, dest *bool) *ValueBinder { n, err := strconv.ParseBool(value) if err != nil { b.setError(b.ErrorFunc(sourceParam, []string{value}, "failed to bind field value to bool", err)) return b } *dest = n return b } func (b *ValueBinder) boolsValue(sourceParam string, dest *[]bool, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } return b.bools(sourceParam, values, dest) } func (b *ValueBinder) bools(sourceParam string, values []string, dest *[]bool) *ValueBinder { tmp := make([]bool, len(values)) for i, v := range values { b.bool(sourceParam, v, &tmp[i]) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *dest = tmp } return b } // Bools binds parameter values to slice of bool variables func (b *ValueBinder) Bools(sourceParam string, dest *[]bool) *ValueBinder { return b.boolsValue(sourceParam, dest, false) } // MustBools requires parameter values to exist to bind to slice of bool variables. Returns error when values does not exist func (b *ValueBinder) MustBools(sourceParam string, dest *[]bool) *ValueBinder { return b.boolsValue(sourceParam, dest, true) } // Float64 binds parameter to float64 variable func (b *ValueBinder) Float64(sourceParam string, dest *float64) *ValueBinder { return b.floatValue(sourceParam, dest, 64, false) } // MustFloat64 requires parameter value to exist to bind to float64 variable. Returns error when value does not exist func (b *ValueBinder) MustFloat64(sourceParam string, dest *float64) *ValueBinder { return b.floatValue(sourceParam, dest, 64, true) } // Float32 binds parameter to float32 variable func (b *ValueBinder) Float32(sourceParam string, dest *float32) *ValueBinder { return b.floatValue(sourceParam, dest, 32, false) } // MustFloat32 requires parameter value to exist to bind to float32 variable. Returns error when value does not exist func (b *ValueBinder) MustFloat32(sourceParam string, dest *float32) *ValueBinder { return b.floatValue(sourceParam, dest, 32, true) } func (b *ValueBinder) floatValue(sourceParam string, dest interface{}, bitSize int, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } return b.float(sourceParam, value, dest, bitSize) } func (b *ValueBinder) float(sourceParam string, value string, dest interface{}, bitSize int) *ValueBinder { n, err := strconv.ParseFloat(value, bitSize) if err != nil { b.setError(b.ErrorFunc(sourceParam, []string{value}, fmt.Sprintf("failed to bind field value to float%v", bitSize), err)) return b } switch d := dest.(type) { case *float64: *d = n case *float32: *d = float32(n) } return b } func (b *ValueBinder) floatsValue(sourceParam string, dest interface{}, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } return b.floats(sourceParam, values, dest) } func (b *ValueBinder) floats(sourceParam string, values []string, dest interface{}) *ValueBinder { switch d := dest.(type) { case *[]float64: tmp := make([]float64, len(values)) for i, v := range values { b.float(sourceParam, v, &tmp[i], 64) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } case *[]float32: tmp := make([]float32, len(values)) for i, v := range values { b.float(sourceParam, v, &tmp[i], 32) if b.failFast && b.errors != nil { return b } } if b.errors == nil { *d = tmp } } return b } // Float64s binds parameter values to slice of float64 variables func (b *ValueBinder) Float64s(sourceParam string, dest *[]float64) *ValueBinder { return b.floatsValue(sourceParam, dest, false) } // MustFloat64s requires parameter values to exist to bind to slice of float64 variables. Returns error when values does not exist func (b *ValueBinder) MustFloat64s(sourceParam string, dest *[]float64) *ValueBinder { return b.floatsValue(sourceParam, dest, true) } // Float32s binds parameter values to slice of float32 variables func (b *ValueBinder) Float32s(sourceParam string, dest *[]float32) *ValueBinder { return b.floatsValue(sourceParam, dest, false) } // MustFloat32s requires parameter values to exist to bind to slice of float32 variables. Returns error when values does not exist func (b *ValueBinder) MustFloat32s(sourceParam string, dest *[]float32) *ValueBinder { return b.floatsValue(sourceParam, dest, true) } // Time binds parameter to time.Time variable func (b *ValueBinder) Time(sourceParam string, dest *time.Time, layout string) *ValueBinder { return b.time(sourceParam, dest, layout, false) } // MustTime requires parameter value to exist to bind to time.Time variable. Returns error when value does not exist func (b *ValueBinder) MustTime(sourceParam string, dest *time.Time, layout string) *ValueBinder { return b.time(sourceParam, dest, layout, true) } func (b *ValueBinder) time(sourceParam string, dest *time.Time, layout string, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{value}, "required field value is empty", nil)) } return b } t, err := time.Parse(layout, value) if err != nil { b.setError(b.ErrorFunc(sourceParam, []string{value}, "failed to bind field value to Time", err)) return b } *dest = t return b } // Times binds parameter values to slice of time.Time variables func (b *ValueBinder) Times(sourceParam string, dest *[]time.Time, layout string) *ValueBinder { return b.times(sourceParam, dest, layout, false) } // MustTimes requires parameter values to exist to bind to slice of time.Time variables. Returns error when values does not exist func (b *ValueBinder) MustTimes(sourceParam string, dest *[]time.Time, layout string) *ValueBinder { return b.times(sourceParam, dest, layout, true) } func (b *ValueBinder) times(sourceParam string, dest *[]time.Time, layout string, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } tmp := make([]time.Time, len(values)) for i, v := range values { t, err := time.Parse(layout, v) if err != nil { b.setError(b.ErrorFunc(sourceParam, []string{v}, "failed to bind field value to Time", err)) if b.failFast { return b } continue } tmp[i] = t } if b.errors == nil { *dest = tmp } return b } // Duration binds parameter to time.Duration variable func (b *ValueBinder) Duration(sourceParam string, dest *time.Duration) *ValueBinder { return b.duration(sourceParam, dest, false) } // MustDuration requires parameter value to exist to bind to time.Duration variable. Returns error when value does not exist func (b *ValueBinder) MustDuration(sourceParam string, dest *time.Duration) *ValueBinder { return b.duration(sourceParam, dest, true) } func (b *ValueBinder) duration(sourceParam string, dest *time.Duration, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{value}, "required field value is empty", nil)) } return b } t, err := time.ParseDuration(value) if err != nil { b.setError(b.ErrorFunc(sourceParam, []string{value}, "failed to bind field value to Duration", err)) return b } *dest = t return b } // Durations binds parameter values to slice of time.Duration variables func (b *ValueBinder) Durations(sourceParam string, dest *[]time.Duration) *ValueBinder { return b.durationsValue(sourceParam, dest, false) } // MustDurations requires parameter values to exist to bind to slice of time.Duration variables. Returns error when values does not exist func (b *ValueBinder) MustDurations(sourceParam string, dest *[]time.Duration) *ValueBinder { return b.durationsValue(sourceParam, dest, true) } func (b *ValueBinder) durationsValue(sourceParam string, dest *[]time.Duration, valueMustExist bool) *ValueBinder { if b.failFast && b.errors != nil { return b } values := b.ValuesFunc(sourceParam) if len(values) == 0 { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{}, "required field value is empty", nil)) } return b } return b.durations(sourceParam, values, dest) } func (b *ValueBinder) durations(sourceParam string, values []string, dest *[]time.Duration) *ValueBinder { tmp := make([]time.Duration, len(values)) for i, v := range values { t, err := time.ParseDuration(v) if err != nil { b.setError(b.ErrorFunc(sourceParam, []string{v}, "failed to bind field value to Duration", err)) if b.failFast { return b } continue } tmp[i] = t } if b.errors == nil { *dest = tmp } return b } // UnixTime binds parameter to time.Time variable (in local Time corresponding to the given Unix time). // // Example: 1609180603 bind to 2020-12-28T18:36:43.000000000+00:00 // // Note: // - time.Time{} (param is empty) and time.Unix(0,0) (param = "0") are not equal func (b *ValueBinder) UnixTime(sourceParam string, dest *time.Time) *ValueBinder { return b.unixTime(sourceParam, dest, false, time.Second) } // MustUnixTime requires parameter value to exist to bind to time.Duration variable (in local time corresponding // to the given Unix time). Returns error when value does not exist. // // Example: 1609180603 bind to 2020-12-28T18:36:43.000000000+00:00 // // Note: // - time.Time{} (param is empty) and time.Unix(0,0) (param = "0") are not equal func (b *ValueBinder) MustUnixTime(sourceParam string, dest *time.Time) *ValueBinder { return b.unixTime(sourceParam, dest, true, time.Second) } // UnixTimeMilli binds parameter to time.Time variable (in local time corresponding to the given Unix time in millisecond precision). // // Example: 1647184410140 bind to 2022-03-13T15:13:30.140000000+00:00 // // Note: // - time.Time{} (param is empty) and time.Unix(0,0) (param = "0") are not equal func (b *ValueBinder) UnixTimeMilli(sourceParam string, dest *time.Time) *ValueBinder { return b.unixTime(sourceParam, dest, false, time.Millisecond) } // MustUnixTimeMilli requires parameter value to exist to bind to time.Duration variable (in local time corresponding // to the given Unix time in millisecond precision). Returns error when value does not exist. // // Example: 1647184410140 bind to 2022-03-13T15:13:30.140000000+00:00 // // Note: // - time.Time{} (param is empty) and time.Unix(0,0) (param = "0") are not equal func (b *ValueBinder) MustUnixTimeMilli(sourceParam string, dest *time.Time) *ValueBinder { return b.unixTime(sourceParam, dest, true, time.Millisecond) } // UnixTimeNano binds parameter to time.Time variable (in local time corresponding to the given Unix time in nanosecond precision). // // Example: 1609180603123456789 binds to 2020-12-28T18:36:43.123456789+00:00 // Example: 1000000000 binds to 1970-01-01T00:00:01.000000000+00:00 // Example: 999999999 binds to 1970-01-01T00:00:00.999999999+00:00 // // Note: // - time.Time{} (param is empty) and time.Unix(0,0) (param = "0") are not equal // - Javascript's Number type only has about 53 bits of precision (Number.MAX_SAFE_INTEGER = 9007199254740991). Compare it to 1609180603123456789 in example. func (b *ValueBinder) UnixTimeNano(sourceParam string, dest *time.Time) *ValueBinder { return b.unixTime(sourceParam, dest, false, time.Nanosecond) } // MustUnixTimeNano requires parameter value to exist to bind to time.Duration variable (in local Time corresponding // to the given Unix time value in nano second precision). Returns error when value does not exist. // // Example: 1609180603123456789 binds to 2020-12-28T18:36:43.123456789+00:00 // Example: 1000000000 binds to 1970-01-01T00:00:01.000000000+00:00 // Example: 999999999 binds to 1970-01-01T00:00:00.999999999+00:00 // // Note: // - time.Time{} (param is empty) and time.Unix(0,0) (param = "0") are not equal // - Javascript's Number type only has about 53 bits of precision (Number.MAX_SAFE_INTEGER = 9007199254740991). Compare it to 1609180603123456789 in example. func (b *ValueBinder) MustUnixTimeNano(sourceParam string, dest *time.Time) *ValueBinder { return b.unixTime(sourceParam, dest, true, time.Nanosecond) } func (b *ValueBinder) unixTime(sourceParam string, dest *time.Time, valueMustExist bool, precision time.Duration) *ValueBinder { if b.failFast && b.errors != nil { return b } value := b.ValueFunc(sourceParam) if value == "" { if valueMustExist { b.setError(b.ErrorFunc(sourceParam, []string{value}, "required field value is empty", nil)) } return b } n, err := strconv.ParseInt(value, 10, 64) if err != nil { b.setError(b.ErrorFunc(sourceParam, []string{value}, "failed to bind field value to Time", err)) return b } switch precision { case time.Second: *dest = time.Unix(n, 0) case time.Millisecond: *dest = time.UnixMilli(n) case time.Nanosecond: *dest = time.Unix(0, n) } return b }