fix(security): harden proxy x-base-url against key leak and SSRF - #6884
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Inject OPENAI_API_KEY only when the parsed hostname is api.openai.com, and reject private/metadata/loopback targets for the open proxy fallback. Fixes ChatGPTNextWeb#6814 Fixes ChatGPTNextWeb#6813
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Summary
OPENAI_API_KEYonly when the parsedx-base-urlhostname is exactlyapi.openai.com(not a query/path/fragment/userinfo substring).x-base-urlvalues and private/metadata/loopback targets (RFC1918, CGNAT, link-local,169.254.169.254,metadata.google.internal, IPv6 loopback/ULA) with HTTP 400 before fetching.Fixes #6814
Fixes #6813
Test plan
./node_modules/.bin/jest --ci test/proxy.test.ts(11 passed)x-base-urlwith?q=api.openai.comno longer receives the server keyx-base-url: http://169.254.169.254returns 400