lldap: build frontend from source

Co-authored-by: Emily Lange <git@indeednotjames.com>

pkgs/servers/ldap/lldap/default.nix

@@ -1,26 +1,46 @@
-{ fetchFromGitHub
+{ binaryen
+, fetchFromGitHub
+, fetchpatch
 , fetchzip
 , lib
 , lldap
 , nixosTests
 , rustPlatform
+, stdenv
+, wasm-bindgen-cli
+, wasm-pack
+, which
 }:
 
 let
-  # We cannot build the wasm frontend from source, as the
-  # wasm32-unknown-unknown rustc target isn't available in nixpkgs yet.
-  # Tracking issue: https://github.com/NixOS/nixpkgs/issues/89426
-  frontend = fetchzip {
-    url = "https://github.com/lldap/lldap/releases/download/v${lldap.version}/amd64-lldap.tar.gz";
-    hash = "sha256-/Ml4L5Gxpnmt1pLSiLNuxtzQYjTCatsVe/hE+Btl8BI=";
-    name = "lldap-frontend-${lldap.version}";
-    postFetch = ''
-      mv $out $TMPDIR/extracted
-      mv $TMPDIR/extracted/app $out
-    '';
+
+  # version of wasm-opt, with https://github.com/rustwasm/wasm-pack/pull/1257 backported
+  wasm-pack-git = wasm-pack.overrideAttrs (oldAttrs: {
+    version = oldAttrs.version + "-git";
+    patches = [(fetchpatch {
+      url = "https://patch-diff.githubusercontent.com/raw/rustwasm/wasm-pack/pull/1257.patch";
+      sha256 = "sha256-npi9ewh0NaD67crTcje9AYxaLLOJOMzqjqEJXZF2LbQ=";
+    })];
+  });
+
+  # replace with upstream wasm rustc, after resolution of
+  # https://github.com/NixOS/nixpkgs/issues/89426
+  rustc-wasm = (rustPlatform.rust.rustc.override {
+    stdenv = stdenv.override {
+      targetPlatform = stdenv.targetPlatform // {
+        parsed = {
+          cpu.name = "wasm32";
+          vendor.name = "unknown";
+          kernel.name = "unknown";
+          abi.name = "unknown";
         };
-in
-rustPlatform.buildRustPackage rec {
+      };
+    };
+  }).overrideAttrs (attrs: {
+    configureFlags = attrs.configureFlags ++ ["--set=build.docs=false"];
+  });
+
+  commonDerivationAttrs = rec {
     pname = "lldap";
     version = "0.4.3";
 
@@ -31,6 +51,10 @@ rustPlatform.buildRustPackage rec {
       hash = "sha256-FAUTykFh2eGVpx6LrCjV9xWbBPH8pCgAJv3vOXFMFZ4=";
     };
 
+    postPatch = ''
+      ln -s --force ${./Cargo.lock} Cargo.lock
+    '';
+
     # `Cargo.lock` has git dependencies, meaning can't use `cargoHash`
     cargoLock = {
       # 0.4.3 has been tagged before the actual Cargo.lock bump, resulting in an inconsitent lock file.
@@ -43,26 +67,49 @@ rustPlatform.buildRustPackage rec {
         "yew_form-0.1.8" = "sha256-1n9C7NiFfTjbmc9B5bDEnz7ZpYJo9ZT8/dioRXJ65hc=";
       };
     };
+  };
 
+  frontend = rustPlatform.buildRustPackage (commonDerivationAttrs // {
+    pname = commonDerivationAttrs.pname + "-frontend";
+
+    nativeBuildInputs = [
+      wasm-pack-git wasm-bindgen-cli binaryen which rustc-wasm rustc-wasm.llvmPackages.lld
+    ];
+
+    buildPhase = ''
+      HOME=`pwd` RUSTFLAGS="-C linker=lld" ./app/build.sh
+    '';
+
+    installPhase = ''
+      mkdir -p $out
+      cp -R app/{index.html,pkg,static} $out/
+    '';
+
+    doCheck = false;
+  });
+
+in rustPlatform.buildRustPackage (commonDerivationAttrs // {
   patches = [
     ./static-frontend-path.patch
   ];
 
-  postPatch = ''
-    ln -s --force ${./Cargo.lock} Cargo.lock
+  postPatch = commonDerivationAttrs.postPatch + ''
     substituteInPlace server/src/infra/tcp_server.rs --subst-var-by frontend '${frontend}'
   '';
 
-  passthru.tests = {
+  passthru = {
+    inherit frontend;
+    tests = {
       inherit (nixosTests) lldap;
     };
+  };
 
   meta = with lib; {
     description = "A lightweight authentication server that provides an opinionated, simplified LDAP interface for authentication";
     homepage = "https://github.com/lldap/lldap";
-    changelog = "https://github.com/lldap/lldap/blob/v${version}/CHANGELOG.md";
+    changelog = "https://github.com/lldap/lldap/blob/v${lldap.version}/CHANGELOG.md";
     license = licenses.gpl3Only;
     platforms = platforms.linux;
-    maintainers = with maintainers; [ indeednotjames ];
+    maintainers = with maintainers; [ indeednotjames bendlas ];
   };
-}
+})