72 строки
1.5 KiB
Go
72 строки
1.5 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package docextractor
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"os"
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"path"
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"strings"
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"github.com/ledongthuc/pdf"
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"github.com/mattermost/mattermost/server/v8/channels/utils"
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)
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type pdfExtractor struct{}
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func (pe *pdfExtractor) Name() string {
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return "pdfExtractor"
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}
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func (pe *pdfExtractor) Match(filename string) bool {
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supportedExtensions := map[string]bool{
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"pdf": true,
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}
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extension := strings.TrimPrefix(path.Ext(filename), ".")
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return supportedExtensions[extension]
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}
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func (pe *pdfExtractor) Extract(filename string, r io.ReadSeeker, maxFileSize int64) (out string, outErr error) {
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defer func() {
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if r := recover(); r != nil {
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out = ""
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outErr = errors.New("error extracting pdf text")
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}
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}()
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f, err := os.CreateTemp(os.TempDir(), "pdflib")
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if err != nil {
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return "", fmt.Errorf("error creating temporary file: %v", err)
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}
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defer f.Close()
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defer os.Remove(f.Name())
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// Bound how much data is copied to disk so a small upload cannot expand
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// into an unbounded amount of temporary storage.
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var src io.Reader = r
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if maxFileSize > 0 {
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src = utils.NewLimitedReaderWithError(r, maxFileSize)
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}
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size, err := io.Copy(f, src)
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if err != nil {
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return "", fmt.Errorf("error copying data into temporary file: %v", err)
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}
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reader, err := pdf.NewReader(f, size)
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if err != nil {
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return "", err
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}
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var buf bytes.Buffer
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b, err := reader.GetPlainText()
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if err != nil {
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return "", err
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}
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buf.ReadFrom(b)
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return buf.String(), nil
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}
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