fix(solc): strip root path from remappings and sources for standard json (#1136)

* fix(solc): strip root path from remappings and sources for standard json input

* fix: use consistent contract for tests

ethers-solc/src/artifacts/mod.rs

@@ -144,6 +144,25 @@ impl CompilerInput {
         self.settings.remappings = remappings;
         self
     }
+
+    /// Sets the path of the source files to `root` adjoined to the existing path
+    #[must_use]
+    pub fn join_path(mut self, root: impl AsRef<Path>) -> Self {
+        let root = root.as_ref();
+        self.sources = self.sources.into_iter().map(|(path, s)| (root.join(path), s)).collect();
+        self
+    }
+
+    /// Removes the `base` path from all source files
+    pub fn strip_prefix(mut self, base: impl AsRef<Path>) -> Self {
+        let base = base.as_ref();
+        self.sources = self
+            .sources
+            .into_iter()
+            .map(|(path, s)| (path.strip_prefix(base).map(|p| p.to_path_buf()).unwrap_or(path), s))
+            .collect();
+        self
+    }
 }
 
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]

ethers-solc/src/lib.rs

@@ -428,8 +428,9 @@ impl<T: ArtifactOutput> Project<T> {
     }
 
     /// Returns standard-json-input to compile the target contract
-    pub fn standard_json_input(&self, target: &Path) -> Result<CompilerInput> {
-        tracing::trace!("Building standard-json-input");
+    pub fn standard_json_input(&self, target: impl AsRef<Path>) -> Result<CompilerInput> {
+        let target = target.as_ref();
+        tracing::trace!("Building standard-json-input for {:?}", target);
         let graph = Graph::resolve(&self.paths)?;
         let target_index = graph.files().get(target).ok_or_else(|| {
             SolcError::msg(format!("cannot resolve file at {:?}", target.display()))
@@ -444,12 +445,23 @@ impl<T: ArtifactOutput> Project<T> {
         let compiler_inputs = CompilerInput::with_sources(
             sources.into_iter().map(|(s, p)| (s.clone(), p.clone())).collect(),
         );
+
+        // strip the path to the project root from all remappings
+        let remappings = self
+            .paths
+            .remappings
+            .clone()
+            .into_iter()
+            .map(|r| r.into_relative(self.root()).to_relative_remapping())
+            .collect::<Vec<_>>();
+
         let compiler_input = compiler_inputs
             .first()
             .ok_or_else(|| SolcError::msg("cannot get the compiler input"))?
             .clone()
             .settings(self.solc_config.settings.clone())
-            .with_remappings(self.paths.remappings.clone());
+            .with_remappings(remappings)
+            .strip_prefix(self.root());
 
         Ok(compiler_input)
     }

ethers-solc/src/project_util/mod.rs

@@ -5,6 +5,8 @@ use crate::{
     error::{bail, Result, SolcError},
     hh::HardhatArtifacts,
     project_util::mock::{MockProjectGenerator, MockProjectSettings},
+    remappings::Remapping,
+    utils,
     utils::tempdir,
     Artifact, ArtifactOutput, Artifacts, ConfigurableArtifacts, ConfigurableContractArtifact,
     FileFilter, PathStyle, Project, ProjectCompileOutput, ProjectPathsConfig, SolFilesCache,
@@ -311,6 +313,11 @@ contract {} {{}}
         assert!(!compiled.is_unchanged());
         self
     }
+
+    /// Returns a list of all source files in the project's `src` directory
+    pub fn list_source_files(&self) -> Vec<PathBuf> {
+        utils::source_files(self.project().sources_path())
+    }
 }
 
 impl<T: ArtifactOutput + Default> TempProject<T> {
@@ -381,6 +388,16 @@ impl TempProject<ConfigurableArtifacts> {
         Ok(Self::create_new(tmp_dir, inner)?)
     }
 
+    /// Creates an initialized dapptools style workspace in a new temporary dir
+    pub fn dapptools_init() -> Result<Self> {
+        let mut project = Self::dapptools()?;
+        let orig_root = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("test-data/dapp-sample");
+        copy_dir(&orig_root, project.root())?;
+        project.project_mut().paths.remappings = Remapping::find_many(project.root());
+
+        Ok(project)
+    }
+
     /// Create a new temporary project and populate it with mock files
     ///
     /// ```no_run

ethers-solc/tests/project.rs

@@ -13,7 +13,7 @@ use ethers_solc::{
     project_util::*,
     remappings::Remapping,
     ConfigurableArtifacts, ExtraOutputValues, Graph, Project, ProjectCompileOutput,
-    ProjectPathsConfig, TestFileFilter,
+    ProjectPathsConfig, Solc, TestFileFilter,
 };
 use pretty_assertions::assert_eq;
 
@@ -955,3 +955,22 @@ fn can_sanitize_bytecode_hash() {
     assert!(!compiled.has_compiler_errors());
     assert!(compiled.find("A").is_some());
 }
+
+#[test]
+fn can_compile_std_json_input() {
+    let tmp = TempProject::dapptools_init().unwrap();
+    tmp.assert_no_errors();
+    let source =
+        tmp.list_source_files().into_iter().filter(|p| p.ends_with("Dapp.t.sol")).next().unwrap();
+    let input = tmp.project().standard_json_input(source).unwrap();
+
+    assert!(input.settings.remappings.contains(&"ds-test/=lib/ds-test/src/".parse().unwrap()));
+    assert!(input.sources.contains_key(Path::new("lib/ds-test/src/test.sol")));
+
+    // should be installed
+    if let Some(solc) = Solc::find_svm_installed_version("0.8.10").ok().flatten() {
+        let out = solc.compile(&input).unwrap();
+        assert!(!out.has_error());
+        assert!(out.sources.contains_key("lib/ds-test/src/test.sol"));
+    }
+}