Add btcpayserver

pkgs/applications/blockchains/btcpayserver/default.nix

@@ -0,0 +1,66 @@
+{ lib, stdenv, fetchFromGitHub, fetchurl, linkFarmFromDrvs, makeWrapper,
+  dotnetPackages, dotnetCorePackages, writeScript, bash
+}:
+
+let
+  deps = import ./deps.nix {
+    fetchNuGet = { name, version, sha256 }: fetchurl {
+      name = "nuget-${name}-${version}.nupkg";
+      url = "https://www.nuget.org/api/v2/package/${name}/${version}";
+      inherit sha256;
+    };
+  };
+  dotnetSdk = dotnetCorePackages.sdk_3_1;
+in
+
+stdenv.mkDerivation rec {
+  pname = "btcpayserver";
+  version = "1.0.5.5";
+
+  src = fetchFromGitHub {
+    owner = pname;
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "11h1nrmb7f44msbhhiz9ddqh5ss2kz6d8ysnvd070x3xj5krgnxz";
+  };
+
+  nativeBuildInputs = [ dotnetSdk dotnetPackages.Nuget ];
+
+  # Due to a bug in btcpayserver, we can't just `dotnet publish` to create a binary.
+  # Build with `dotnet build` instead and add a custom `dotnet run` script.
+  buildPhase = ''
+    export HOME=$TMP/home
+    export DOTNET_CLI_TELEMETRY_OPTOUT=1
+    export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
+
+    nuget sources Add -Name tmpsrc -Source $TMP/nuget
+    nuget init ${linkFarmFromDrvs "deps" deps} $TMP/nuget
+
+    dotnet restore --source $TMP/nuget BTCPayServer/BTCPayServer.csproj
+    dotnet build -c Release BTCPayServer/BTCPayServer.csproj
+  '';
+
+  runScript =  ''
+    #!${bash}/bin/bash
+    DOTNET_CLI_TELEMETRY_OPTOUT=1 exec ${dotnetSdk}/bin/dotnet run --no-launch-profile --no-build \
+      -c Release -p @@SHARE@@/BTCPayServer/BTCPayServer.csproj -- "$@"
+  '';
+
+  installPhase = ''
+    cd ..
+    share=$out/share/$pname
+    mkdir -p $share
+    mv -T source $share
+    install -D -m500 <(echo "$runScript" | sed "s|@@SHARE@@|$share|") $out/bin/$pname
+  '';
+
+  dontStrip = true;
+
+  meta = with lib; {
+    description = "Self-hosted, open-source cryptocurrency payment processor";
+    homepage = "https://btcpayserver.org";
+    maintainers = with maintainers; [ kcalvinalvin earvstedt ];
+    license = lib.licenses.mit;
+    platforms = lib.platforms.linux;
+  };
+}