go-pst

A library for reading PST files (written in Go/Golang)

Introduction

go-pst is a library for reading PST files (written in Go/Golang).

The PFF (Personal Folder File) and OFF (Offline Folder File) format is used to store Microsoft Outlook e-mails, appointments and contacts. The PST (Personal Storage Table), OST (Offline Storage Table) and PAB (Personal Address Book) file format consist of the PFF format.

Usage

$ go install github.com/mooijtech/go-pst/v6

package main

import (
  "fmt"
  "github.com/mooijtech/go-pst/v6/pkg"
  "github.com/mooijtech/go-pst/v6/pkg/properties"
  "github.com/rotisserie/eris"
  "golang.org/x/text/encoding"
  "os"
  "time"

  charsets "github.com/emersion/go-message/charset"
)

func main() {
  pst.ExtendCharsets(func(name string, enc encoding.Encoding) {
    charsets.RegisterEncoding(name, enc)
  })

  startTime := time.Now()

  fmt.Println("Initializing...")

  reader, err := os.Open("../data/enron.pst")

  if err != nil {
    panic(fmt.Sprintf("Failed to open PST file: %+v\n", err))
  }

  pstFile, err := pst.New(reader)

  if err != nil {
    panic(fmt.Sprintf("Failed to open PST file: %+v\n", err))
  }

  defer func() {
    pstFile.Cleanup()

    if errClosing := reader.Close(); errClosing != nil {
      panic(fmt.Sprintf("Failed to close PST file: %+v\n", err))
    }
  }()

  // Create attachments directory
  if _, err := os.Stat("attachments"); err != nil {
    if err := os.Mkdir("attachments", 0755); err != nil {
      panic(fmt.Sprintf("Failed to create attachments directory: %+v", err))
    }
  }

  // Walk through folders.
  if err := pstFile.WalkFolders(func(folder *pst.Folder) error {
    fmt.Printf("Walking folder: %s\n", folder.Name)

    messageIterator, err := folder.GetMessageIterator()

    if eris.Is(err, pst.ErrMessagesNotFound) {
      // Folder has no messages.
      return nil
    } else if err != nil {
      return err
    }

    // Iterate through messages.
    for messageIterator.Next() {
      message := messageIterator.Value()

      switch messageProperties := message.Properties.(type) {
      case *properties.Appointment:
        //fmt.Printf("Appointment: %s\n", messageProperties.String())
      case *properties.Contact:
        //fmt.Printf("Contact: %s\n", messageProperties.String())
      case *properties.Task:
        //fmt.Printf("Task: %s\n", messageProperties.String())
      case *properties.RSS:
        //fmt.Printf("RSS: %s\n", messageProperties.String())
      case *properties.AddressBook:
        //fmt.Printf("Address book: %s\n", messageProperties.String())
      case *properties.Message:
        fmt.Printf("Subject: %s\n", messageProperties.GetSubject())
      case *properties.Note:
        //fmt.Printf("Note: %s\n", messageProperties.String())
      default:
        fmt.Printf("Unknown message type\n")
      }

      attachmentIterator, err := message.GetAttachmentIterator()

      if eris.Is(err, pst.ErrAttachmentsNotFound) {
        // This message has no attachments.
        continue
      } else if err != nil {
        return err
      }

      // Iterate through attachments.
      for attachmentIterator.Next() {
        attachment := attachmentIterator.Value()

        var attachmentOutputPath string

        if attachment.GetAttachLongFilename() != "" {
          attachmentOutputPath = fmt.Sprintf("attachments/%d-%s", attachment.Identifier, attachment.GetAttachLongFilename())
        } else {
          attachmentOutputPath = fmt.Sprintf("attachments/UNKNOWN_%d", attachment.Identifier)
        }

        attachmentOutput, err := os.Create(attachmentOutputPath)

        if err != nil {
          return err
        }

        if _, err := attachment.WriteTo(attachmentOutput); err != nil {
          return err
        }

        if err := attachmentOutput.Close(); err != nil {
          return err
        }
      }

      if attachmentIterator.Err() != nil {
        return attachmentIterator.Err()
      }
    }

    return messageIterator.Err()
  }); err != nil {
    panic(fmt.Sprintf("Failed to walk folders: %+v\n", err))
  }

  fmt.Printf("Time: %s\n", time.Since(startTime).String())
}

License

This project is licensed under the [Apache License 2.0]().

Documentation

• Outlook Personal Folders (.pst) File Format
• Exchange Server Protocols Master Property List

Implementations

• java-libpst
• pstreader
  • Special thanks to James McLeod
• libpff
• XstReader
• PANhunt

Contact

Feel free to contact me if you have any questions.
Name: Marten Mooij
Email: info@mooijtech.com