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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,238 @@ | ||
| package bundle | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "encoding/binary" | ||
| "fmt" | ||
| "io" | ||
|
|
||
| "github.com/hamba/avro/v2" | ||
| "github.com/samber/lo" | ||
| ) | ||
|
|
||
| type Decoder struct { | ||
| reader io.Reader | ||
| buffer io.Reader | ||
| schema avro.Schema | ||
| header Header | ||
| cursor uint32 | ||
| } | ||
|
|
||
| func (d *Decoder) DecodeHeader() (*Header, error) { | ||
| if err := d.decodeHeaderDataItemNumbers(); err != nil { | ||
| return nil, fmt.Errorf("decode data item numbers: %w", err) | ||
| } | ||
|
|
||
| if err := d.decodeHeaderDataInfos(); err != nil { | ||
| return nil, fmt.Errorf("decode data infos: %w", err) | ||
| } | ||
|
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| header := d.header | ||
|
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| return &header, nil | ||
| } | ||
|
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| func (d *Decoder) DecodeDataItem() (*DataItem, error) { | ||
| dataItemInfo := d.header.DataItemInfos[d.cursor] | ||
|
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| d.buffer = io.LimitReader(d.reader, int64(dataItemInfo.Size)) | ||
|
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| var dataItem DataItem | ||
|
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| if err := d.decodeDataItemSignature(&dataItem); err != nil { | ||
| return nil, fmt.Errorf("decode data item info signature: %w", err) | ||
| } | ||
|
|
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| if err := d.decodeDataItemOwner(&dataItem); err != nil { | ||
| return nil, fmt.Errorf("decode data item info owner: %w", err) | ||
| } | ||
|
|
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| if err := d.decodeDataItemTarget(&dataItem); err != nil { | ||
| return nil, fmt.Errorf("decode data item info target: %w", err) | ||
| } | ||
|
|
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| if err := d.decodeDataItemAnchor(&dataItem); err != nil { | ||
| return nil, fmt.Errorf("decode data item info anchor: %w", err) | ||
| } | ||
|
|
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| if err := d.decodeDataItemTags(&dataItem); err != nil { | ||
| return nil, fmt.Errorf("decode data item info tags: %w", err) | ||
| } | ||
|
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| dataItem.dataReader = d.buffer | ||
|
|
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| d.cursor++ | ||
|
|
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| return &dataItem, nil | ||
| } | ||
|
|
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| func (d *Decoder) Next() bool { | ||
| return d.cursor < d.header.Numbers | ||
| } | ||
|
|
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| func (d *Decoder) decodeHeaderDataItemNumbers() error { | ||
| buffer := make([]byte, 32) | ||
|
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| _, err := io.ReadFull(d.reader, buffer) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| d.header.Numbers = binary.LittleEndian.Uint32(buffer) | ||
|
|
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| return nil | ||
| } | ||
|
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| func (d *Decoder) decodeHeaderDataInfos() error { | ||
| d.header.DataItemInfos = make([]DataItemInfo, 0, d.header.Numbers) | ||
|
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| buffer := make([]byte, 64) | ||
|
|
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| for index := uint32(0); index < d.header.Numbers; index++ { | ||
| if _, err := io.ReadFull(d.reader, buffer); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| dataItemInfo := DataItemInfo{ | ||
| Size: binary.LittleEndian.Uint32(buffer[:32]), | ||
| ID: base64.RawURLEncoding.EncodeToString(buffer[32:]), | ||
| } | ||
|
|
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| d.header.DataItemInfos = append(d.header.DataItemInfos, dataItemInfo) | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
|
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| func (d *Decoder) decodeDataItemSignature(dataItem *DataItem) error { | ||
| buffer := make([]byte, 2) | ||
|
|
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| if _, err := io.ReadFull(d.buffer, buffer); err != nil { | ||
| return err | ||
| } | ||
|
|
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| dataItem.SignatureType = binary.LittleEndian.Uint16(buffer) | ||
|
|
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| signatureType, supported := d.lookupDataItemSignatureType(dataItem) | ||
| if !supported { | ||
| return fmt.Errorf("unsupported signature type: %d", dataItem.SignatureType) | ||
| } | ||
|
|
||
| buffer = make([]byte, signatureType.SignatureLength) | ||
|
|
||
| if _, err := io.ReadFull(d.buffer, buffer); err != nil { | ||
| return err | ||
| } | ||
|
|
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| dataItem.Signature = base64.RawURLEncoding.EncodeToString(buffer) | ||
|
|
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| return nil | ||
| } | ||
|
|
||
| func (d *Decoder) decodeDataItemOwner(dataItem *DataItem) error { | ||
| var buffer []byte | ||
|
|
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| signatureType, supported := d.lookupDataItemSignatureType(dataItem) | ||
| if !supported { | ||
| return fmt.Errorf("unsupported signature type: %d", dataItem.SignatureType) | ||
| } | ||
|
|
||
| buffer = make([]byte, signatureType.PublicKeyLength) | ||
|
|
||
| if _, err := io.ReadFull(d.buffer, buffer); err != nil { | ||
| return err | ||
| } | ||
|
|
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| dataItem.Owner = base64.RawURLEncoding.EncodeToString(buffer) | ||
|
|
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| return nil | ||
| } | ||
|
|
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| func (d *Decoder) decodeDataItemPresenceField(buffer []byte) (bool, error) { | ||
| if _, err := io.ReadFull(d.buffer, buffer[:1]); err != nil { | ||
| return false, err | ||
| } | ||
|
|
||
| switch flag := buffer[0]; flag { | ||
| case 0x0: | ||
| return false, nil | ||
| case 0x1: | ||
| _, err := io.ReadFull(d.buffer, buffer[1:]) | ||
|
|
||
| return true, err | ||
| default: | ||
| return false, fmt.Errorf("invalid presence byte: %d", flag) | ||
| } | ||
| } | ||
|
|
||
| func (d *Decoder) decodeDataItemTarget(dataItem *DataItem) error { | ||
| buffer := make([]byte, 32+1) | ||
|
|
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| presence, err := d.decodeDataItemPresenceField(buffer) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| if presence { | ||
| dataItem.Target = base64.RawURLEncoding.EncodeToString(buffer[1:]) | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
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| func (d *Decoder) decodeDataItemAnchor(dataItem *DataItem) error { | ||
| buffer := make([]byte, 32+1) | ||
|
|
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| presence, err := d.decodeDataItemPresenceField(buffer) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if presence { | ||
| dataItem.Anchor = base64.RawURLEncoding.EncodeToString(buffer[1:]) | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
|
||
| func (d *Decoder) decodeDataItemTags(dataItem *DataItem) error { | ||
| buffer := make([]byte, 8) | ||
|
|
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| if _, err := io.ReadFull(d.buffer, buffer); err != nil { | ||
| return err | ||
| } | ||
|
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| dataItem.TagsNumber = binary.LittleEndian.Uint16(buffer) | ||
|
|
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| if _, err := io.ReadFull(d.buffer, buffer); err != nil { | ||
| return err | ||
| } | ||
|
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| dataItem.TagsBytes = binary.LittleEndian.Uint16(buffer) | ||
|
|
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| buffer = make([]byte, dataItem.TagsBytes) | ||
|
|
||
| if _, err := io.ReadFull(d.buffer, buffer); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return avro.Unmarshal(d.schema, buffer, &dataItem.Tags) | ||
| } | ||
|
|
||
| func (d *Decoder) lookupDataItemSignatureType(dataItem *DataItem) (*SignatureType, bool) { | ||
| signatureType, exist := signatureTypeMap[dataItem.SignatureType] | ||
| if !exist { | ||
| return nil, false | ||
| } | ||
|
|
||
| return &signatureType, true | ||
| } | ||
|
|
||
| func NewDecoder(reader io.Reader) *Decoder { | ||
| decoder := Decoder{ | ||
| reader: reader, | ||
| schema: lo.Must(avro.Parse(`{"type":"array","items":{"type":"record","name":"Tag","fields":[{"name":"name","type":"bytes"},{"name":"value","type":"bytes"}]}}`)), | ||
| } | ||
|
|
||
| return &decoder | ||
| } |
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