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// Copyright (C) MongoDB, Inc. 2017-present. // // Licensed under the Apache License, Version 2.0 (the "License"); you may // not use this file except in compliance with the License. You may obtain // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 package bsoncore import ( "errors" "fmt" "io" "strconv" "strings" "go.mongodb.org/mongo-driver/bson/bsontype" ) // ValidationError is an error type returned when attempting to validate a document or array. type ValidationError string func (ve ValidationError) Error() string { return string(ve) } // NewDocumentLengthError creates and returns an error for when the length of a document exceeds the // bytes available. func NewDocumentLengthError(length, rem int) error { return lengthError("document", length, rem) } func lengthError(bufferType string, length, rem int) error { return ValidationError(fmt.Sprintf("%v length exceeds available bytes. length=%d remainingBytes=%d", bufferType, length, rem)) } // InsufficientBytesError indicates that there were not enough bytes to read the next component. type InsufficientBytesError struct { Source []byte Remaining []byte } // NewInsufficientBytesError creates a new InsufficientBytesError with the given Document and // remaining bytes. func NewInsufficientBytesError(src, rem []byte) InsufficientBytesError { return InsufficientBytesError{Source: src, Remaining: rem} } // Error implements the error interface. func (ibe InsufficientBytesError) Error() string { return "too few bytes to read next component" } // Equal checks that err2 also is an ErrTooSmall. func (ibe InsufficientBytesError) Equal(err2 error) bool { switch err2.(type) { case InsufficientBytesError: return true default: return false } } // InvalidDepthTraversalError is returned when attempting a recursive Lookup when one component of // the path is neither an embedded document nor an array. type InvalidDepthTraversalError struct { Key string Type bsontype.Type } func (idte InvalidDepthTraversalError) Error() string { return fmt.Sprintf( "attempt to traverse into %s, but it's type is %s, not %s nor %s", idte.Key, idte.Type, bsontype.EmbeddedDocument, bsontype.Array, ) } // ErrMissingNull is returned when a document or array's last byte is not null. const ErrMissingNull ValidationError = "document or array end is missing null byte" // ErrInvalidLength indicates that a length in a binary representation of a BSON document or array // is invalid. const ErrInvalidLength ValidationError = "document or array length is invalid" // ErrNilReader indicates that an operation was attempted on a nil io.Reader. var ErrNilReader = errors.New("nil reader") // ErrEmptyKey indicates that no key was provided to a Lookup method. var ErrEmptyKey = errors.New("empty key provided") // ErrElementNotFound indicates that an Element matching a certain condition does not exist. var ErrElementNotFound = errors.New("element not found") // ErrOutOfBounds indicates that an index provided to access something was invalid. var ErrOutOfBounds = errors.New("out of bounds") // Document is a raw bytes representation of a BSON document. type Document []byte // NewDocumentFromReader reads a document from r. This function will only validate the length is // correct and that the document ends with a null byte. func NewDocumentFromReader(r io.Reader) (Document, error) { return newBufferFromReader(r) } func newBufferFromReader(r io.Reader) ([]byte, error) { if r == nil { return nil, ErrNilReader } var lengthBytes [4]byte // ReadFull guarantees that we will have read at least len(lengthBytes) if err == nil _, err := io.ReadFull(r, lengthBytes[:]) if err != nil { return nil, err } length, _, _ := readi32(lengthBytes[:]) // ignore ok since we always have enough bytes to read a length if length < 0 { return nil, ErrInvalidLength } buffer := make([]byte, length) copy(buffer, lengthBytes[:]) _, err = io.ReadFull(r, buffer[4:]) if err != nil { return nil, err } if buffer[length-1] != 0x00 { return nil, ErrMissingNull } return buffer, nil } // Lookup searches the document, potentially recursively, for the given key. If there are multiple // keys provided, this method will recurse down, as long as the top and intermediate nodes are // either documents or arrays. If an error occurs or if the value doesn't exist, an empty Value is // returned. func (d Document) Lookup(key ...string) Value { val, _ := d.LookupErr(key...) return val } // LookupErr is the same as Lookup, except it returns an error in addition to an empty Value. func (d Document) LookupErr(key ...string) (Value, error) { if len(key) < 1 { return Value{}, ErrEmptyKey } length, rem, ok := ReadLength(d) if !ok { return Value{}, NewInsufficientBytesError(d, rem) } length -= 4 var elem Element for length > 1 { elem, rem, ok = ReadElement(rem) length -= int32(len(elem)) if !ok { return Value{}, NewInsufficientBytesError(d, rem) } // We use `KeyBytes` rather than `Key` to avoid a needless string alloc. if string(elem.KeyBytes()) != key[0] { continue } if len(key) > 1 { tt := bsontype.Type(elem[0]) switch tt { case bsontype.EmbeddedDocument: val, err := elem.Value().Document().LookupErr(key[1:]...) if err != nil { return Value{}, err } return val, nil case bsontype.Array: // Convert to Document to continue Lookup recursion. val, err := Document(elem.Value().Array()).LookupErr(key[1:]...) if err != nil { return Value{}, err } return val, nil default: return Value{}, InvalidDepthTraversalError{Key: elem.Key(), Type: tt} } } return elem.ValueErr() } return Value{}, ErrElementNotFound } // Index searches for and retrieves the element at the given index. This method will panic if // the document is invalid or if the index is out of bounds. func (d Document) Index(index uint) Element { elem, err := d.IndexErr(index) if err != nil { panic(err) } return elem } // IndexErr searches for and retrieves the element at the given index. func (d Document) IndexErr(index uint) (Element, error) { return indexErr(d, index) } func indexErr(b []byte, index uint) (Element, error) { length, rem, ok := ReadLength(b) if !ok { return nil, NewInsufficientBytesError(b, rem) } length -= 4 var current uint var elem Element for length > 1 { elem, rem, ok = ReadElement(rem) length -= int32(len(elem)) if !ok { return nil, NewInsufficientBytesError(b, rem) } if current != index { current++ continue } return elem, nil } return nil, ErrOutOfBounds } // DebugString outputs a human readable version of Document. It will attempt to stringify the // valid components of the document even if the entire document is not valid. func (d Document) DebugString() string { if len(d) < 5 { return "" } var buf strings.Builder buf.WriteString("Document") length, rem, _ := ReadLength(d) // We know we have enough bytes to read the length buf.WriteByte('(') buf.WriteString(strconv.Itoa(int(length))) length -= 4 buf.WriteString("){") var elem Element var ok bool for length > 1 { elem, rem, ok = ReadElement(rem) length -= int32(len(elem)) if !ok { buf.WriteString(fmt.Sprintf("", length)) break } buf.WriteString(elem.DebugString()) } buf.WriteByte('}') return buf.String() } // String outputs an ExtendedJSON version of Document. If the document is not valid, this method // returns an empty string. func (d Document) String() string { if len(d) < 5 { return "" } var buf strings.Builder buf.WriteByte('{') length, rem, _ := ReadLength(d) // We know we have enough bytes to read the length length -= 4 var elem Element var ok bool first := true for length > 1 { if !first { buf.WriteByte(',') } elem, rem, ok = ReadElement(rem) length -= int32(len(elem)) if !ok { return "" } buf.WriteString(elem.String()) first = false } buf.WriteByte('}') return buf.String() } // Elements returns this document as a slice of elements. The returned slice will contain valid // elements. If the document is not valid, the elements up to the invalid point will be returned // along with an error. func (d Document) Elements() ([]Element, error) { length, rem, ok := ReadLength(d) if !ok { return nil, NewInsufficientBytesError(d, rem) } length -= 4 var elem Element var elems []Element for length > 1 { elem, rem, ok = ReadElement(rem) length -= int32(len(elem)) if !ok { return elems, NewInsufficientBytesError(d, rem) } if err := elem.Validate(); err != nil { return elems, err } elems = append(elems, elem) } return elems, nil } // Values returns this document as a slice of values. The returned slice will contain valid values. // If the document is not valid, the values up to the invalid point will be returned along with an // error. func (d Document) Values() ([]Value, error) { return values(d) } func values(b []byte) ([]Value, error) { length, rem, ok := ReadLength(b) if !ok { return nil, NewInsufficientBytesError(b, rem) } length -= 4 var elem Element var vals []Value for length > 1 { elem, rem, ok = ReadElement(rem) length -= int32(len(elem)) if !ok { return vals, NewInsufficientBytesError(b, rem) } if err := elem.Value().Validate(); err != nil { return vals, err } vals = append(vals, elem.Value()) } return vals, nil } // Validate validates the document and ensures the elements contained within are valid. func (d Document) Validate() error { length, rem, ok := ReadLength(d) if !ok { return NewInsufficientBytesError(d, rem) } if int(length) > len(d) { return NewDocumentLengthError(int(length), len(d)) } if d[length-1] != 0x00 { return ErrMissingNull } length -= 4 var elem Element for length > 1 { elem, rem, ok = ReadElement(rem) length -= int32(len(elem)) if !ok { return NewInsufficientBytesError(d, rem) } err := elem.Validate() if err != nil { return err } } if len(rem) < 1 || rem[0] != 0x00 { return ErrMissingNull } return nil }