RFE: expose delegated metadata to client application
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研究方向
先閱讀 ngclient 現有的 get_targetinfo() 流程和連結的設計文件,尤其是 Metadata role as search index 提案。追蹤委派中繼資料的搜尋方式,並判定對於不相符的目標路徑和不會終止的委派,預期的行為為何。當用戶端能夠公開相關的 Targets 物件,且已涵蓋議定的邊界情況時,即表示完成。
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描述
EDIT: The overall issue is described in detail in https://docs.google.com/document/d/1rWHAM2qCUtnjWD4lOrGWE2EIDLoA7eSy4-jB66Wgh0o . The suggestion here is roughly the Metadata role (file) as search index solution in the document.
Assume a setup like this (this is what we expect a community artifact repository like PyPI to look like if it uses developer signatures with TUF):
- a specific project/product team controls a delegated metadata
- TUF clients want to know details of all of the artifacts in this metadata (to e.g. figure out which versions of an artifact are available)
Currently there is no way for the client application to get the whole metadata content from ngclient. We could provide a call much like get_targetinfo() that instead of the TargetFile would return the Targets object where the target search ended:
def get_targets_metadata(target_path: str) -> Targets
"""returns a Targets object of the metadata where the search for target_path terminated"""
This is not applicable to every TUF repo:
- it requires a "contract" between repository and client: client has to know of a
target_paththat is delegated to the correct metadata -- in the pypi example it could be e.g. the PyPI project name - this is only useful if all "related" target files are listed in the same metadata
But with those assumptions the client can now easily get not just the list of target files it's interested in but also any custom metadata embedded in the targets metadata.
I've not thought through all the cases (what happens if there is no targetpath match? what if there is no terminating delegation?) but I think this is something we could consider implementing
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