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FEAT: Add EML/MIME support to converter task #43
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d0cde43
feat: Add EML file converter using enmime library to extract email bo…
Mayureshpawar29 33ac22e
Merge branch 'main' into eml-parser
Mayureshpawar29 ca401d3
fix: refine EML attachment filename length handling.
Mayureshpawar29 6a1a7a1
feat: document EML format support for the converter task, including o…
Mayureshpawar29 ef3f6b8
refactor: Simplify filename truncation logic to ensure total length d…
Mayureshpawar29 6136184
feat: Extract and save EML headers to `headers.json` and rename the `…
Mayureshpawar29 4273ea9
refactor: centralize EML converter output processing into a dedicated…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| package converter | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "fmt" | ||
| "mime" | ||
| "path/filepath" | ||
|
|
||
| "github.com/jhillyerd/enmime" | ||
| ) | ||
|
|
||
| type eml struct{} | ||
|
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| const maxFilenameLength = 200 | ||
|
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| func (c *eml) convert(data []byte, _ string) ([]converterOutput, error) { | ||
|
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| envelope, err := enmime.ReadEnvelope(bytes.NewReader(data)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to parse EML: %v", err) | ||
| } | ||
|
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| var outputs []converterOutput | ||
|
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| if envelope.HTML != "" { | ||
| if out := c.processOutput([]byte(envelope.HTML), "body.html", "text/html"); out != nil { | ||
| outputs = append(outputs, *out) | ||
| } | ||
| } | ||
| if envelope.Text != "" { | ||
| if out := c.processOutput([]byte(envelope.Text), "body.txt", "text/plain"); out != nil { | ||
| outputs = append(outputs, *out) | ||
| } | ||
| } | ||
|
|
||
| // Extract headers | ||
| headerMap := make(map[string]string) | ||
| for _, key := range envelope.GetHeaderKeys() { | ||
| headerMap[key] = envelope.GetHeader(key) | ||
| } | ||
| if len(headerMap) > 0 { | ||
| var buf bytes.Buffer | ||
| enc := json.NewEncoder(&buf) | ||
| enc.SetEscapeHTML(false) | ||
| enc.SetIndent("", " ") | ||
| if err := enc.Encode(headerMap); err == nil { | ||
| if out := c.processOutput(buf.Bytes(), "headers.json", "application/json"); out != nil { | ||
| outputs = append(outputs, *out) | ||
| } | ||
| } | ||
| } | ||
|
|
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| for _, attachment := range envelope.Attachments { | ||
| if out := c.processOutput(attachment.Content, attachment.FileName, attachment.ContentType); out != nil { | ||
| outputs = append(outputs, *out) | ||
| } | ||
| } | ||
|
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| for _, inline := range envelope.Inlines { | ||
| if out := c.processOutput(inline.Content, inline.FileName, inline.ContentType); out != nil { | ||
| outputs = append(outputs, *out) | ||
| } | ||
| } | ||
|
|
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| return outputs, nil | ||
| } | ||
|
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| func (c *eml) processOutput(content []byte, fileName string, contentType string) *converterOutput { | ||
| if len(content) == 0 { | ||
| return nil | ||
| } | ||
|
|
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| fileName = filepath.Base(fileName) | ||
|
|
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| // Fallback for filename length | ||
| if len(fileName) > maxFilenameLength { | ||
| ext := filepath.Ext(fileName) | ||
| base := fileName[:len(fileName)-len(ext)] | ||
| base = base[:maxFilenameLength-len(ext)] | ||
| fileName = base + ext | ||
| } | ||
|
|
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| // Fallback for missing content type | ||
| if contentType == "" { | ||
| opts := mime.TypeByExtension(filepath.Ext(fileName)) | ||
| if opts != "" { | ||
| contentType = opts | ||
| } else { | ||
| contentType = "application/octet-stream" | ||
| } | ||
| } | ||
|
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| return &converterOutput{ | ||
| Data: content, | ||
| Metadata: map[string]string{ | ||
| "converter_filename": fileName, | ||
| "content_type": contentType, | ||
| }, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| tasks: | ||
| - name: read_eml_file | ||
| type: file | ||
| path: test/pipelines/converter/test_mail | ||
| - name: convert_from_eml | ||
| type: converter | ||
| format: eml | ||
| - name: save_output | ||
| type: file | ||
| path: output/{{ context "converter_filename" }} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| From: sender@example.com | ||
| To: receiver@example.com | ||
| Subject: Test Email with PDF, CSV, and HTML Attachments | ||
| Date: Mon, 16 Feb 2026 10:00:00 +0000 | ||
| Message-ID: <test123@example.com> | ||
| MIME-Version: 1.0 | ||
| Content-Type: multipart/mixed; boundary="BOUNDARY123" | ||
|
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| --BOUNDARY123 | ||
| Content-Type: text/plain; charset="UTF-8" | ||
| Content-Transfer-Encoding: 7bit | ||
|
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| Hello, | ||
|
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| Please find attached the PDF, CSV, and HTML files for testing. | ||
|
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| Regards, | ||
| Test Sender | ||
|
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||
| --BOUNDARY123 | ||
| Content-Type: application/pdf | ||
| Content-Disposition: attachment; filename="test.pdf" | ||
| Content-Transfer-Encoding: base64 | ||
|
|
||
| JVBERi0xLjQKMSAwIG9iago8PAovVHlwZSAvQ2F0YWxvZwovUGFnZXMgMiAwIFIKPj4KZW5k | ||
| b2JqCjIgMCBvYmoKPDwKL1R5cGUgL1BhZ2VzCi9LaWRzIFszIDAgUl0KL0NvdW50IDEKPj4K | ||
| ZW5kb2JqCjMgMCBvYmoKPDwKL1R5cGUgL1BhZ2UKL1BhcmVudCAyIDAgUgovTWVkaWFCb3gg | ||
| WzAgMCAzMDAgMTQ0XQovQ29udGVudHMgNCAwIFIKPj4KZW5kb2JqCjQgMCBvYmoKPDwKL0xl | ||
| bmd0aCA0NAo+PgpzdHJlYW0KQlQKL0YxIDEyIFRmCjEwMCAxMDAgVGQKKFRlc3QgUERGIEZp | ||
| bGUpIFRqCkVUCmVuZHN0cmVhbQplbmRvYmoKeHJlZgowIDUKMDAwMDAwMDAwMCA2NTUzNSBm | ||
| IAowMDAwMDAwMDEwIDAwMDAwIG4gCjAwMDAwMDAwNTMgMDAwMDAgbiAKMDAwMDAwMDEwMCAw | ||
| MDAwMCBuIAowMDAwMDAwMTc1IDAwMDAwIG4gCnRyYWlsZXIKPDwKL1NpemUgNQovUm9vdCAx | ||
| IDAgUgo+PgpzdGFydHhyZWYKMjUwCiUlRU9G | ||
|
|
||
| --BOUNDARY123 | ||
| Content-Type: text/csv | ||
| Content-Disposition: attachment; filename="test.csv" | ||
| Content-Transfer-Encoding: base64 | ||
|
|
||
| bmFtZSxhZ2UKSm9obiwzMApBbGljZSwyNQ== | ||
|
|
||
| --BOUNDARY123 | ||
| Content-Type: text/html | ||
| Content-Disposition: attachment; filename="test.html" | ||
| Content-Transfer-Encoding: base64 | ||
|
|
||
| PGh0bWw+Cjxib2R5PkhlbGxvIFdvcmxkPC9ib2R5Pgo8L2h0bWw+ | ||
|
|
||
| --BOUNDARY123-- | ||
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