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importer.go
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importer.go
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Reads Certificate JSON files from https://censys.io/data/certificates
package censysdata
import (
"encoding/base64"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"os"
"time"
)
type CensysEntry struct {
Valid_nss bool
Raw string
Validation_timestamp *string
Timestamp *time.Time
CertBytes []byte
LineNumber uint64
Offset uint64
// parsed ParsedCensysEntry
}
type Importer interface {
SeekByte(byteOffset uint64) error
Size() (uint64, error)
SeekLine(lineOffset uint64) error
NextEntry() (*CensysEntry, error)
ByteOffset() uint64
String() string
}
type FileImporter struct {
currentLine uint64
byteCounter *ImporterByteCounter
decoder *json.Decoder
fileHandle *os.File
}
type ImporterByteCounter struct {
CurrentOffset uint64
}
func (ibc *ImporterByteCounter) Write(p []byte) (n int, err error) {
ibc.CurrentOffset += uint64(len(p))
return 0, nil
}
func OpenFileHandle(fileHandle *os.File) (*FileImporter, error) {
byteCounter := &ImporterByteCounter{}
readerObj := io.TeeReader(fileHandle, byteCounter)
importer := &FileImporter{
currentLine: 0,
byteCounter: byteCounter,
decoder: json.NewDecoder(readerObj),
fileHandle: fileHandle,
}
return importer, nil
}
func OpenFile(path string) (*FileImporter, error) {
fileHandle, err := os.Open(path)
if err != nil {
return nil, err
}
return OpenFileHandle(fileHandle)
}
func (imp *FileImporter) Close() error {
return imp.fileHandle.Close()
}
func (imp *FileImporter) String() string {
return fmt.Sprintf("File Importer (File=%s)", imp.fileHandle.Name())
}
func (imp *FileImporter) SeekByte(byteOffset uint64) error {
newOffset, err := imp.fileHandle.Seek(int64(byteOffset), 1)
log.Printf("Seeked forward %d bytes, now at %d", byteOffset, newOffset)
imp.byteCounter.CurrentOffset = uint64(newOffset)
return err
}
func (imp *FileImporter) Size() (uint64, error) {
info, err := imp.fileHandle.Stat()
if err != nil {
return 0, err
}
return uint64(info.Size()), err
}
func (imp *FileImporter) SeekLine(lineOffset uint64) error {
for ; imp.currentLine < lineOffset; imp.currentLine++ {
obj, err := imp.NextEntry()
if err != nil {
return err
}
if obj == nil {
return fmt.Errorf("Unexpected EOF")
}
}
log.Printf("Skipped to line %d, offset %d", imp.currentLine, imp.byteCounter.CurrentOffset)
return nil
}
func (imp *FileImporter) ByteOffset() uint64 {
return imp.byteCounter.CurrentOffset
}
func (imp *FileImporter) NextEntry() (*CensysEntry, error) {
if !imp.decoder.More() {
return nil, nil
}
data := &CensysEntry{}
err := imp.decoder.Decode(&data)
if err != nil {
return nil, err
}
certBytes, err := base64.StdEncoding.DecodeString(data.Raw)
if err != nil {
return nil, err
}
data.CertBytes = certBytes
data.LineNumber = imp.currentLine
data.Offset = imp.ByteOffset()
data.Timestamp = &time.Time{}
if data.Validation_timestamp != nil {
timestamp, err := time.Parse("2006-01-02 15:04:05", *data.Validation_timestamp)
if err != nil {
return nil, err
}
data.Timestamp = ×tamp
}
return data, err
}
type HttpImporter struct {
currentLine uint64
startingOffset uint64
byteCounter *ImporterByteCounter
decoder *json.Decoder
url string
resp *http.Response
}
func OpenURL(url string) (*HttpImporter, error) {
importer := &HttpImporter{
currentLine: 0,
byteCounter: &ImporterByteCounter{},
url: url,
decoder: nil,
resp: nil,
}
return importer, nil
}
func (imp *HttpImporter) String() string {
return fmt.Sprintf("HTTP Importer (URL=%s)", imp.url)
}
func (imp *HttpImporter) ByteOffset() uint64 {
return imp.byteCounter.CurrentOffset
}
func (imp *HttpImporter) SeekByte(byteOffset uint64) error {
if imp.resp != nil {
return fmt.Errorf("Cannot seek on a HTTP session that already started.")
}
imp.startingOffset = byteOffset
imp.byteCounter.CurrentOffset = byteOffset
log.Printf("Set byte offset to %d", byteOffset)
return nil
}
func (imp *HttpImporter) Size() (uint64, error) {
if imp.resp != nil {
return uint64(imp.resp.ContentLength), nil
}
return 0, fmt.Errorf("Cannot get size of an HTTP session that has not started.")
}
func (imp *HttpImporter) SeekLine(lineOffset uint64) error {
for ; imp.currentLine < lineOffset; imp.currentLine++ {
obj, err := imp.NextEntry()
if err != nil {
return err
}
if obj == nil {
return fmt.Errorf("Unexpected EOF")
}
}
log.Printf("Skipped to line %d, offset %d", imp.currentLine, imp.byteCounter.CurrentOffset)
return nil
}
func (imp *HttpImporter) NextEntry() (*CensysEntry, error) {
if imp.resp == nil {
// Not yet connected, so let's lazily connect
req, err := http.NewRequest("GET", imp.url, nil)
if err != nil {
return nil, err
}
if imp.startingOffset > 0 {
req.Header.Add("Range", fmt.Sprintf("bytes=%d-", imp.startingOffset))
}
client := &http.Client{}
imp.resp, err = client.Do(req)
if err != nil {
return nil, err
}
imp.decoder = json.NewDecoder(io.TeeReader(imp.resp.Body, imp.byteCounter))
}
if !imp.decoder.More() {
return nil, nil
}
data := &CensysEntry{}
err := imp.decoder.Decode(&data)
if err != nil {
return nil, err
}
certBytes, err := base64.StdEncoding.DecodeString(data.Raw)
if err != nil {
return nil, err
}
data.CertBytes = certBytes
data.LineNumber = imp.currentLine
data.Offset = imp.ByteOffset()
data.Timestamp = &time.Time{}
if data.Validation_timestamp != nil {
timestamp, err := time.Parse("2006-01-02 15:04:05", *data.Validation_timestamp)
if err != nil {
return nil, err
}
data.Timestamp = ×tamp
}
return data, err
}