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libfetchers: avoid api.github.com ratelimit if no github token is set

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If we don't have any github token, we won't be able to fetch private
repos, but we are also more likely to run into API limits since
we don't have a token. To mitigate this only ever use the github api
if we actually have a token.
This commit is contained in:
Jörg Thalheim 2022-09-12 22:50:18 +02:00
parent 88646eea29
commit d9abce4ad4
1 changed files with 11 additions and 8 deletions
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19
src/libfetchers/github.cc
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@ -262,17 +262,20 @@ struct GitHubInputScheme : GitArchiveInputScheme
DownloadUrl getDownloadUrl(const Input & input) const override
{
// FIXME: use regular /archive URLs instead? api.github.com
// might have stricter rate limits.
auto host = maybeGetStrAttr(input.attrs, "host").value_or("github.com");
auto url = fmt(
host == "github.com"
? "https://api.%s/repos/%s/%s/tarball/%s"
: "https://%s/api/v3/repos/%s/%s/tarball/%s",
host, getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo"),
Headers headers = makeHeadersWithAuthTokens(host);
// If we have no auth headers then we default to the public archive
// urls so we do not run into rate limits.
const auto urlFmt =
host != "github.com"
? "https://%s/api/v3/repos/%s/%s/tarball/%s"
: headers.empty()
? "https://%s/%s/%s/archive/%s.tar.gz"
: "https://api.%s/repos/%s/%s/tarball/%s";
const auto url = fmt(urlFmt, host, getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo"),
input.getRev()->to_string(Base16, false));
Headers headers = makeHeadersWithAuthTokens(host);
return DownloadUrl { url, headers };
}