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Balázs Szücs 84ed1d7ecb
feat(conversion): refactor EML parser to use Simple Java Mail library and add MSG support (#5427)
# Description of Changes


Note on Simple Java Mail:
- SJM contains Angus/Jakarta Mail in it.
- SJM is a very thin layer on Angus Mail; see here:
https://github.com/bbottema/simple-java-mail
- SJM gives high level methods to more reliably parse in email via Angus
Mail, but also contains lots of other interesting features.
- SJM is Apache 2 licensed

This pull request updates the email processing utilities to add support
for parsing and validating Outlook MSG files, refactors the
`EmlProcessingUtils` utility class to use instance methods and improved
resource management, and enhances the handling and styling of generated
email HTML. The changes also introduce external CSS resource loading
with a fallback mechanism, and update dependencies to support MSG file
parsing.

**MSG file support and validation:**
- Added `simple-java-mail` and `outlook-module` dependencies to enable
EML and MSG file parsing, and updated validation logic to recognize and
accept MSG files by checking their magic bytes.
(`app/common/build.gradle`, `EmlProcessingUtils.java`)
**Refactoring and modernization of `EmlProcessingUtils`:**
- Converted static methods and fields in `EmlProcessingUtils` to
instance methods/fields, improving testability and future extensibility.
(`EmlProcessingUtils.java`)

**Enhanced HTML/CSS styling for email rendering:**
- Updated HTML generation to use consistent formatting and improved
style variable usage, and refactored CSS injection to load from an
external resource (`email-pdf-styles.css`) with a synchronized cache and
a minimal fallback if the resource is missing.
(`EmlProcessingUtils.java`)
**Attachment and content rendering improvements:**
- Improved the formatting of meta-information (e.g., CC, BCC, Date) and
attachment sections in generated email HTML, and ensured more robust
handling of empty or missing content. (`EmlProcessingUtils.java`)

**General code cleanup and logging:**
- Added SLF4J logging for error handling when loading CSS resources, and
cleaned up imports and method signatures for clarity and
maintainability. (`EmlProcessingUtils.java`)


<img width="367" height="991" alt="image"
src="https://github.com/user-attachments/assets/0cfb959c-da92-4cff-9e52-ff4ab7fa806e"
/>


<!--
Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [X] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [X] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [X] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [X] I have performed a self-review of my own code
- [X] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [X] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
2026-01-13 21:17:40 +00:00
.devcontainer chore: update development configs, formatting tools, and CI enhancements (#4130) 2025-08-08 12:52:51 +01:00
.github build(deps): bump step-security/harden-runner from 2.12.1 to 2.14.0 (#5324) 2026-01-13 20:38:11 +00:00
.vscode V2 Auto rename (#4244) 2025-09-05 17:12:52 +01:00
app feat(conversion): refactor EML parser to use Simple Java Mail library and add MSG support (#5427) 2026-01-13 21:17:40 +00:00
devGuide V1 merge (#5193) 2025-12-21 10:40:32 +00:00
devTools build(deps-dev): bump stylelint from 16.26.0 to 16.26.1 in /devTools (#5314) 2025-12-29 15:53:41 +00:00
docker build(ci): pin base container images, switch npm install to npm ci, and harden EML error handling (#5353) 2026-01-13 13:59:59 +00:00
docs V1 merge (#5193) 2025-12-21 10:40:32 +00:00
frontend feat(conversion): refactor EML parser to use Simple Java Mail library and add MSG support (#5427) 2026-01-13 21:17:40 +00:00
gradle/wrapper
images Revert "[ImgBot] Optimize images" (#5293) 2025-12-22 22:10:23 +00:00
scripts Updated ga-IE translations and added keys to ignore list (#5178) 2026-01-13 16:09:17 +00:00
testing build(deps): bump pypdf from 6.4.0 to 6.6.0 in /testing/cucumber (#5422) 2026-01-13 20:23:55 +00:00
.dockerignore java frontend (#5097) 2025-12-02 17:15:29 +00:00
.editorconfig Add linting to frontend (#4341) 2025-09-04 14:08:28 +01:00
.git-blame-ignore-revs refactor: move modules under app/ directory and update file paths (#3938) 2025-07-14 20:53:11 +01:00
.gitattributes refactor: move modules under app/ directory and update file paths (#3938) 2025-07-14 20:53:11 +01:00
.gitignore photo scan V2 (#5255) 2025-12-30 18:55:56 +00:00
.pre-commit-config.yaml deps(ci): update Dependabot, pre-commit tooling, and testing dependencies (#5170) 2025-12-27 23:56:57 +00:00
ADDING_TOOLS.md Toml (#5115) 2025-12-03 09:57:00 +00:00
build.gradle feat(build): enhance JaCoCo reporting with coverage summary and enforce thresholds (#5352) 2026-01-12 22:17:01 +00:00
CLAUDE.md Feature/viewer annotation toggle (#4557) 2025-10-02 10:40:18 +01:00
CONTRIBUTING.md
DATABASE.md feat(database): make backup schedule configurable via system keys (#4251) 2025-09-04 15:02:31 +01:00
DeveloperGuide.md V2 Tauri integration (#3854) 2025-11-05 11:44:59 +00:00
gradle.properties build(local): simplify writeVersion task with WriteProperties plugin and enable build caching (#4139) 2025-08-08 10:36:30 +01:00
gradlew
gradlew.bat
HowToUseOCR.md
launch4jConfig.xml ci: enhance GitHub Actions workflows with Gradle setup, caching improvements, and Docker image testing (#3956) 2025-07-16 17:17:11 +01:00
LICENSE Update LICENSE with proprietary directory details 2025-11-27 11:11:53 +00:00
README.md Update wording for third-party services reference 2025-12-02 19:14:03 +00:00
SECURITY.md
settings.gradle refactor: move modules under app/ directory and update file paths (#3938) 2025-07-14 20:53:11 +01:00
test_globalsign.pdf V2 Validate PDF Signature tool (#4679) 2025-10-16 13:45:59 +01:00
test_irs_signed.pdf V2 Validate PDF Signature tool (#4679) 2025-10-16 13:45:59 +01:00
WINDOWS_SIGNING.md Add initial Windows signing infrastructure (#4945) 2025-11-20 12:21:42 +00:00

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