104 lines
3.1 KiB
C++
104 lines
3.1 KiB
C++
#include "args.hh"
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#include "content-address.hh"
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#include "split.hh"
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namespace nix {
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std::string FixedOutputHash::printMethodAlgo() const {
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return makeFileIngestionPrefix(method) + printHashType(hash.type);
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}
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std::string makeFileIngestionPrefix(const FileIngestionMethod m) {
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switch (m) {
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case FileIngestionMethod::Flat:
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return "";
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case FileIngestionMethod::Recursive:
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return "r:";
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default:
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throw Error("impossible, caught both cases");
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}
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}
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std::string makeFixedOutputCA(FileIngestionMethod method, const Hash & hash)
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{
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return "fixed:"
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+ makeFileIngestionPrefix(method)
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+ hash.to_string(Base32, true);
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}
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std::string renderContentAddress(ContentAddress ca) {
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return std::visit(overloaded {
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[](TextHash th) {
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return "text:" + th.hash.to_string(Base32, true);
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},
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[](FixedOutputHash fsh) {
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return makeFixedOutputCA(fsh.method, fsh.hash);
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}
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}, ca);
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}
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ContentAddress parseContentAddress(std::string_view rawCa) {
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auto rest = rawCa;
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std::string_view prefix;
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{
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auto optPrefix = splitPrefixTo(rest, ':');
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if (!optPrefix)
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throw UsageError("not a content address because it is not in the form '<prefix>:<rest>': %s", rawCa);
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prefix = *optPrefix;
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}
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auto parseHashType_ = [&](){
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auto hashTypeRaw = splitPrefixTo(rest, ':');
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if (!hashTypeRaw)
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throw UsageError("content address hash must be in form '<algo>:<hash>', but found: %s", rawCa);
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HashType hashType = parseHashType(*hashTypeRaw);
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return std::move(hashType);
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};
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// Switch on prefix
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if (prefix == "text") {
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// No parsing of the method, "text" only support flat.
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HashType hashType = parseHashType_();
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if (hashType != htSHA256)
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throw Error("text content address hash should use %s, but instead uses %s",
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printHashType(htSHA256), printHashType(hashType));
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return TextHash {
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.hash = Hash::parseNonSRIUnprefixed(rest, std::move(hashType)),
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};
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} else if (prefix == "fixed") {
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// Parse method
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auto method = FileIngestionMethod::Flat;
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if (splitPrefix(rest, "r:"))
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method = FileIngestionMethod::Recursive;
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HashType hashType = parseHashType_();
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return FixedOutputHash {
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.method = method,
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.hash = Hash::parseNonSRIUnprefixed(rest, std::move(hashType)),
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};
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} else
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throw UsageError("content address prefix '%s' is unrecognized. Recogonized prefixes are 'text' or 'fixed'", prefix);
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};
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std::optional<ContentAddress> parseContentAddressOpt(std::string_view rawCaOpt) {
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return rawCaOpt == "" ? std::optional<ContentAddress> {} : parseContentAddress(rawCaOpt);
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};
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std::string renderContentAddress(std::optional<ContentAddress> ca) {
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return ca ? renderContentAddress(*ca) : "";
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}
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Hash getContentAddressHash(const ContentAddress & ca)
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{
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return std::visit(overloaded {
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[](TextHash th) {
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return th.hash;
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},
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[](FixedOutputHash fsh) {
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return fsh.hash;
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}
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}, ca);
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}
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}
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