asmhatre
73ab67b171
Companion project for "The Spring Security Filter Chain Explained". A real Spring Boot 4.1.1 servlet application whose scenarios are Spring profiles, plus a diagnostic controller that prints the live FilterChainProxy, the reflected FilterOrderRegistration table, and the servlet container's own registrations. Twelve captured transcripts under docs/output/, nine cross-linked doc chapters, 21 assertions. Also fixes a broken relative link in method-security/docs/01: the cross-module reference to context-propagation/README.md needed two levels up, not one.
48 lines
3.0 KiB
Markdown
48 lines
3.0 KiB
Markdown
# spring-security-demo
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Companion code for the Spring Security series on [ankurm.com](https://ankurm.com). Each
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directory is a self-contained Maven project for one article, with its own `pom.xml`, its own
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numbered documentation chapters, and its own captured output under `docs/output/` — regenerated
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by that module's `scripts/run-all.sh`, never typed by hand.
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| Module | Article | What it demonstrates |
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|---|---|---|
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| [`context-propagation/`](context-propagation/README.md) | [Spring Security Context Propagation: The Complete Guide](https://ankurm.com/spring-security-context-propagation-complete-guide/) | Whether a `SecurityContext` survives `@Async`, executors, virtual threads, `StructuredTaskScope`, Reactor, schedulers and the servlet filter chain |
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| [`method-security/`](method-security/README.md) | [Method Security in Spring Security 7: `@PreAuthorize`, `@PostAuthorize` and the Proxy Traps](https://ankurm.com/spring-security-7-method-security-proxy-traps/) | What the method-security annotations do, the full SpEL surface, and the cases where the check silently does not run |
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| [`filter-chain/`](filter-chain/README.md) | [The Spring Security Filter Chain Explained](https://ankurm.com/spring-security-filter-chain-explained/) | Every filter in the default chain and its order number, where a custom filter actually lands, and how to read the TRACE log |
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The three are related more closely than they look. `filter-chain` is about how an
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`Authentication` gets into `SecurityContextHolder` in the first place and in what order;
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`context-propagation` is about whether it survives leaving the request thread; `method-security`
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reads it back on whatever thread it ends up on. An `@Async` method carrying `@PreAuthorize` fails
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with `AuthenticationCredentialsNotFoundException` for reasons that belong to the second module,
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not the third — and a custom authentication filter that never populated the context in the first
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place fails the same way, for reasons that belong to the first.
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## Common ground
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All three modules target the same verified stack: **JDK 25** (Temurin 25.0.4.1+1),
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**Spring Framework 7.0.9**, **Spring Security 7.1.1** — the versions Spring Boot **4.1.1**
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manages. Versions were taken from `maven-metadata.xml` on Maven Central rather than from
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release announcements.
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`context-propagation` additionally needs `--enable-preview`, because `StructuredTaskScope` is
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still a preview API on JDK 25. `method-security` does not. `filter-chain` is the only module
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that is a real servlet application: it inherits `spring-boot-starter-parent` and runs on Tomcat,
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because the thing it demonstrates only exists inside a servlet container.
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## Running a module
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```bash
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cd method-security # or context-propagation, or filter-chain
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./scripts/run-all.sh # every demo plus the test suite, regenerating docs/output/
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mvn test # just the assertions
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```
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`filter-chain` also has `./scripts/run.sh <profile>` and `./scripts/stop.sh`, because its
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scenarios are a running web application rather than a `main()` method.
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## License
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MIT — see [LICENSE](LICENSE).
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