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.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.alt.md
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# AP3는 browser session을 BFF-owned Bearer 요청으로 바꾼다
## Alternative text
Browser session zone과 server-side BFF zone 사이에서 AP3_SESSION이 downstream Bearer 요청으로 바뀌는 BFF 아키텍처.
## Long description
왼쪽 browser session zone에는 OAuth token 없이 HttpOnly AP3_SESSION을 가진 브라우저가 있다. 오른쪽 server-side application zone에는 BFF, authorized-client store, 내부 Resource Server가 있다. 브라우저의 /bff/api/me 요청은 BFF에서 종료되고, BFF는 current authorized client를 조회해 server-held access token으로 Resource Server용 Bearer 요청을 조립한다.
## Elements and evidence
- **Boundary: Browser session boundary** (system): OAuth token 대신 HttpOnly AP3_SESSION을 보유하는 browser 경계. Evidence: L166–L168.
- **Boundary: Server-side application path** (system): BFF, server-side authorized client와 내부 Resource Server가 연결되는 backend 경계. Evidence: L166–L170.
- **Browser** (actor): OAuth token을 받지 않고 AP3_SESSION으로 BFF endpoint를 호출한다. Evidence: L166–L168.
- **Spring BFF** (service): 브라우저 session을 현재 authorized client와 downstream Bearer 요청으로 변환하는 confidential client. Evidence: L166–L170.
- **Authorized-client store** (database): BFF가 access와 refresh token을 보관하고 현재 authorized client를 조회하는 server-side state. Evidence: L166–L170.
- **Internal Resource Server** (service): BFF가 만든 Bearer 요청을 받는 내부 보호 자원. Evidence: L168–L168.
## Relationships
- **Spring BFF → Internal Resource Server:** downstream Bearer 요청. Evidence: L168–L168.
- **Spring BFF → Authorized-client store:** 현재 authorized client 조회. Evidence: L168–L168.
- **Browser → Spring BFF:** AP3_SESSION · /bff/api/me. Evidence: L168–L168.
.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.d2
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# AP3는 browser session을 BFF-owned Bearer 요청으로 바꾼다
# Question: AP3에서 OAuth token 없는 브라우저 요청은 어느 경계를 지나 내부 Resource Server Bearer 요청이 되는가?
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.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.dot
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.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.drawio
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.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.excalidraw
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.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.manifest.json
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.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.mmd
+16
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%% AP3는 browser session을 BFF-owned Bearer 요청으로 바꾼다
%% question: AP3에서 OAuth token 없는 브라우저 요청은 어느 경계를 지나 내부 Resource Server Bearer 요청이 되는가?
flowchart LR
subgraph g_browser_session_zone["Browser session boundary"]
n0(["Browser"])
end
subgraph g_server_application_zone["Server-side application path"]
n1["Spring BFF"]
n2[("Authorized-client store")]
n3["Internal Resource Server"]
end
n0 -->|"AP3_SESSION · /bff/api/me"| n1
n1 -->|"현재 authorized client 조회"| n2
n1 -->|"downstream Bearer 요청"| n3
classDef external stroke-dasharray: 6 4
class n0 external
.work/keycloak-four-patterns/final/assets/ap3-bff-architecture/ap3-bff-architecture.svg
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<title id="diagram-title">AP3는 browser session을 BFF-owned Bearer 요청으로 바꾼다</title>
<desc id="diagram-description">왼쪽 browser session zone에는 OAuth token 없이 HttpOnly AP3_SESSION을 가진 브라우저가 있다. 오른쪽 server-side application zone에는 BFF, authorized-client store, 내부 Resource Server가 있다. 브라우저의 /bff/api/me 요청은 BFF에서 종료되고, BFF는 current authorized client를 조회해 server-held access token으로 Resource Server용 Bearer 요청을 조립한다.</desc>
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