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isValidSchemeName: Add function

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(cherry picked from commit d3a85b6834)
This commit is contained in:
Robert Hensing 2023-12-06 15:14:41 +01:00
parent 772a8efff4
commit 2116ee2454
3 changed files with 44 additions and 0 deletions
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17
src/libutil/url.cc
View file

@ -2,6 +2,7 @@
#include "url-parts.hh"
#include "util.hh"
#include "split.hh"
#include "string.hh"
namespace nix {
@ -175,4 +176,20 @@ std::string fixGitURL(const std::string & url)
}
}
// https://www.rfc-editor.org/rfc/rfc3986#section-3.1
bool isValidSchemeName(std::string_view s)
{
if (s.empty()) return false;
if (!isASCIIAlpha(s[0])) return false;
for (auto c : s.substr(1)) {
if (isASCIIAlpha(c)) continue;
if (isASCIIDigit(c)) continue;
if (c == '+') continue;
if (c == '-') continue;
if (c == '.') continue;
return false;
}
return true;
}
}

9
src/libutil/url.hh
View file

@ -50,4 +50,13 @@ ParsedUrlScheme parseUrlScheme(std::string_view scheme);
changes absolute paths into file:// URLs. */
std::string fixGitURL(const std::string & url);
/**
* Whether a string is valid as RFC 3986 scheme name.
* Colon `:` is part of the URI; not the scheme name, and therefore rejected.
* See https://www.rfc-editor.org/rfc/rfc3986#section-3.1
*
* Does not check whether the scheme is understood, as that's context-dependent.
*/
bool isValidSchemeName(std::string_view scheme);
}