modrinth: sanitize modpack file's path (#326)

Author: itzg

src/main/java/me/itzg/helpers/modrinth/ModrinthPackInstaller.java

@@ -112,8 +112,9 @@ private Flux<Path> processModpackFiles(ModpackIndex modpackIndex) {
             )
             .publishOn(Schedulers.boundedElastic())
             .flatMap(modpackFile -> {
+                final String modpackFilePath = sanitizeModFilePath(modpackFile.getPath());
                 final Path outFilePath =
-                    this.outputDirectory.resolve(modpackFile.getPath());
+                    this.outputDirectory.resolve(modpackFilePath);
                 try {
                     //noinspection BlockingMethodInNonBlockingContext
                     Files.createDirectories(outFilePath.getParent());
@@ -126,11 +127,22 @@ private Flux<Path> processModpackFiles(ModpackIndex modpackIndex) {
                     outFilePath,
                     modpackFile.getDownloads().get(0),
                     (uri, file, contentSizeBytes) ->
-                        log.info("Downloaded {}", modpackFile.getPath())
+                        log.info("Downloaded {}", modpackFilePath)
                 );
             });
     }
 
+    private String sanitizeModFilePath(String path) {
+        // Using only backslash delimiters and not forward slashes?
+        // (mixed usage will assume backslashes were purposeful)
+        if (path.contains("\\") && !path.contains("/")) {
+            return path.replace("\\", "/");
+        }
+        else {
+            return path;
+        }
+    }
+
     @SuppressWarnings("SameParameterValue")
     private Stream<Path> extractOverrides(String... overridesDirs) {
         try (ZipFile zipFileReader = new ZipFile(zipFile.toFile())) {

src/test/java/me/itzg/helpers/modrinth/InstallModrinthModpackCommandTest.java

@@ -47,7 +47,7 @@ void downloadsAndInstallsModrinthModpack(
         String expectedFileData = "some test data";
         String relativeFilePath = "test_file";
         ModpackFile testFile = createHostedModpackFile(
-            relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
+            relativeFilePath, relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
 
         ModpackIndex index = createBasicModpackIndex();
         index.getFiles().add(testFile);
@@ -74,7 +74,7 @@ void downloadsAndInstallsModrinthModpack_versionNumberAndAnyLoader(
         String expectedFileData = "some test data";
         String relativeFilePath = "test_file";
         ModpackFile testFile = createHostedModpackFile(
-            relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
+            relativeFilePath, relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
 
         ModpackIndex index = createBasicModpackIndex();
         index.getFiles().add(testFile);
@@ -161,7 +161,7 @@ void removesFilesNoLongerNeedeByUpdatedModpack(
         String expectedFileData = "some test data";
         String relativeFilePath = "test_file";
         ModpackFile testFile = createHostedModpackFile(
-            relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
+            relativeFilePath, relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
 
         ModpackIndex index = createBasicModpackIndex();
         index.getFiles().add(testFile);
@@ -201,7 +201,7 @@ void downloadsAndInstallsGenericModpacksOverHttp(
         String relativeFilePath = "test_file";
         String modpackDownloadPath = "/files/modpacks/test_modpack-1.0.0.mrpack";
         ModpackFile testFile = createHostedModpackFile(
-            relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
+            relativeFilePath, relativeFilePath, expectedFileData, wm.getHttpBaseUrl());
 
         ModpackIndex index = createBasicModpackIndex();
         index.getFiles().add(testFile);

src/test/java/me/itzg/helpers/modrinth/ModrinthPackInstallerTest.java

@@ -69,7 +69,44 @@ void installDownloadsDependentFilesToInstallation(
 
             ModpackIndex index = createBasicModpackIndex();
             index.getFiles().add(createHostedModpackFile(
-                relativeFilePath, expectedFileData, wm.getHttpBaseUrl()));
+                relativeFilePath, relativeFilePath, expectedFileData, wm.getHttpBaseUrl()));
+
+            Files.write(modpackPath, createModrinthPack(index));
+
+            ModrinthPackInstaller installerUT = new ModrinthPackInstaller(
+                apiClient, fetchOpts, modpackPath, tempDir, resultsFile, false);
+
+            final Installation installation = installerUT.processModpack(sharedFetch).block();
+
+            assertThat(installation).isNotNull();
+            List<Path> installedFiles = installation.getFiles();
+
+            assertThat(expectedFilePath).isRegularFile();
+            assertThat(expectedFilePath).content()
+                .isEqualTo(expectedFileData);
+            assertThat(installedFiles.size()).isEqualTo(1);
+            assertThat(installedFiles.get(0)).isEqualTo(expectedFilePath);
+        }
+    }
+
+    @Test
+    void sanitizesModFilePath(
+            WireMockRuntimeInfo wm, @TempDir Path tempDir
+        ) throws IOException, URISyntaxException
+    {
+        Options fetchOpts = new SharedFetchArgs().options();
+        try (SharedFetch sharedFetch = Fetch.sharedFetch("install-modrinth-modpack", fetchOpts)) {
+            ModrinthApiClient apiClient = new ModrinthApiClient(
+                wm.getHttpBaseUrl(), "install-modrinth-modpack", fetchOpts);
+
+            String expectedFileData = "some test data";
+            Path expectedFilePath = tempDir.resolve("mods/mod.jar");
+            Path resultsFile = tempDir.resolve("results");
+            Path modpackPath = tempDir.resolve("test.mrpack");
+
+            ModpackIndex index = createBasicModpackIndex();
+            index.getFiles().add(createHostedModpackFile(
+                "mods\\mod.jar", "mods/mod.jar", expectedFileData, wm.getHttpBaseUrl()));
 
             Files.write(modpackPath, createModrinthPack(index));
 

src/test/java/me/itzg/helpers/modrinth/ModrinthTestHelpers.java

@@ -101,17 +101,17 @@ static byte[] createModrinthPack(ModpackIndex index) throws IOException {
     }
 
     static ModpackIndex.ModpackFile createHostedModpackFile(
-            String relativeFileLocation, String data, String wmBaseUrl
+            String relativeFileLocation, String urlSubpath, String data, String wmBaseUrl
         ) throws URISyntaxException
     {
-        stubFor(get("/files/" + relativeFileLocation)
+        stubFor(get("/files/" + urlSubpath)
             .willReturn(ok().withBody(data)));
 
         ModpackIndex.ModpackFile modpackFile = new ModpackIndex.ModpackFile()
             .setDownloads(new ArrayList<>())
             .setPath(relativeFileLocation);
         modpackFile.getDownloads().add(
-            new URI(wmBaseUrl + "/files/" + relativeFileLocation));
+            new URI(wmBaseUrl + "/files/" + urlSubpath));
 
         return modpackFile;
     }