Expose ability to (un)block libvips ops by name

docs/api-utility.md

@@ -166,3 +166,58 @@ const simd = sharp.simd();
 const simd = sharp.simd(false);
 // prevent libvips from using liborc at runtime
 ```
+
+
+## block
+Block libvips operations at runtime.
+
+This is in addition to the `VIPS_BLOCK_UNTRUSTED` environment variable,
+which when set will block all "untrusted" operations.
+
+
+**Since**: 0.32.4  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| options | <code>Object</code> |  |
+| options.operation | <code>Array.&lt;string&gt;</code> | List of libvips low-level operation names to block. |
+
+**Example** *(Block all TIFF input.)*  
+```js
+sharp.block({
+  operation: ['VipsForeignLoadTiff']
+});
+```
+
+
+## unblock
+Unblock libvips operations at runtime.
+
+This is useful for defining a list of allowed operations.
+
+
+**Since**: 0.32.4  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| options | <code>Object</code> |  |
+| options.operation | <code>Array.&lt;string&gt;</code> | List of libvips low-level operation names to unblock. |
+
+**Example** *(Block all input except WebP from the filesystem.)*  
+```js
+sharp.block({
+  operation: ['VipsForeignLoad']
+});
+sharp.unblock({
+  operation: ['VipsForeignLoadWebpFile']
+});
+```
+**Example** *(Block all input except JPEG and PNG from a Buffer or Stream.)*  
+```js
+sharp.block({
+  operation: ['VipsForeignLoad']
+});
+sharp.unblock({
+  operation: ['VipsForeignLoadJpegBuffer', 'VipsForeignLoadPngBuffer']
+});
+```

docs/changelog.md

@@ -4,6 +4,10 @@
 
 Requires libvips v8.14.2
 
+### v0.32.4 - TBD
+
+* Expose ability to (un)block low-level libvips operations by name.
+
 ### v0.32.3 - 14th July 2023
 
 * Expose `preset` option for WebP output.

lib/utility.js

@@ -202,6 +202,72 @@ function simd (simd) {
 }
 simd(true);
 
+/**
+ * Block libvips operations at runtime.
+ *
+ * This is in addition to the `VIPS_BLOCK_UNTRUSTED` environment variable,
+ * which when set will block all "untrusted" operations.
+ *
+ * @since 0.32.4
+ *
+ * @example <caption>Block all TIFF input.</caption>
+ * sharp.block({
+ *   operation: ['VipsForeignLoadTiff']
+ * });
+ *
+ * @param {Object} options
+ * @param {Array<string>} options.operation - List of libvips low-level operation names to block.
+ */
+function block (options) {
+  if (is.object(options)) {
+    if (Array.isArray(options.operation) && options.operation.every(is.string)) {
+      sharp.block(options.operation, true);
+    } else {
+      throw is.invalidParameterError('operation', 'Array<string>', options.operation);
+    }
+  } else {
+    throw is.invalidParameterError('options', 'object', options);
+  }
+}
+
+/**
+ * Unblock libvips operations at runtime.
+ *
+ * This is useful for defining a list of allowed operations.
+ *
+ * @since 0.32.4
+ *
+ * @example <caption>Block all input except WebP from the filesystem.</caption>
+ * sharp.block({
+ *   operation: ['VipsForeignLoad']
+ * });
+ * sharp.unblock({
+ *   operation: ['VipsForeignLoadWebpFile']
+ * });
+ *
+ * @example <caption>Block all input except JPEG and PNG from a Buffer or Stream.</caption>
+ * sharp.block({
+ *   operation: ['VipsForeignLoad']
+ * });
+ * sharp.unblock({
+ *   operation: ['VipsForeignLoadJpegBuffer', 'VipsForeignLoadPngBuffer']
+ * });
+ *
+ * @param {Object} options
+ * @param {Array<string>} options.operation - List of libvips low-level operation names to unblock.
+ */
+function unblock (options) {
+  if (is.object(options)) {
+    if (Array.isArray(options.operation) && options.operation.every(is.string)) {
+      sharp.block(options.operation, false);
+    } else {
+      throw is.invalidParameterError('operation', 'Array<string>', options.operation);
+    }
+  } else {
+    throw is.invalidParameterError('options', 'object', options);
+  }
+}
+
 /**
  * Decorate the Sharp class with utility-related functions.
  * @private
@@ -216,4 +282,6 @@ module.exports = function (Sharp) {
   Sharp.versions = versions;
   Sharp.vendor = vendor;
   Sharp.queue = queue;
+  Sharp.block = block;
+  Sharp.unblock = unblock;
 };

src/sharp.cc

@@ -31,6 +31,7 @@ Napi::Object init(Napi::Env env, Napi::Object exports) {
   exports.Set("simd", Napi::Function::New(env, simd));
   exports.Set("libvipsVersion", Napi::Function::New(env, libvipsVersion));
   exports.Set("format", Napi::Function::New(env, format));
+  exports.Set("block", Napi::Function::New(env, block));
   exports.Set("_maxColourDistance", Napi::Function::New(env, _maxColourDistance));
   exports.Set("_isUsingJemalloc", Napi::Function::New(env, _isUsingJemalloc));
   exports.Set("stats", Napi::Function::New(env, stats));

src/utilities.cc

@@ -164,6 +164,17 @@ Napi::Value format(const Napi::CallbackInfo& info) {
   return format;
 }
 
+/*
+  (Un)block libvips operations at runtime.
+*/
+void block(const Napi::CallbackInfo& info) {
+  Napi::Array ops = info[size_t(0)].As<Napi::Array>();
+  bool const state = info[size_t(1)].As<Napi::Boolean>().Value();
+  for (unsigned int i = 0; i < ops.Length(); i++) {
+    vips_operation_block_set(ops.Get(i).As<Napi::String>().Utf8Value().c_str(), state);
+  }
+}
+
 /*
   Synchronous, internal-only method used by some of the functional tests.
   Calculates the maximum colour distance using the DE2000 algorithm

src/utilities.h

@@ -12,6 +12,7 @@ Napi::Value counters(const Napi::CallbackInfo& info);
 Napi::Value simd(const Napi::CallbackInfo& info);
 Napi::Value libvipsVersion(const Napi::CallbackInfo& info);
 Napi::Value format(const Napi::CallbackInfo& info);
+void block(const Napi::CallbackInfo& info);
 Napi::Value _maxColourDistance(const Napi::CallbackInfo& info);
 Napi::Value _isUsingJemalloc(const Napi::CallbackInfo& info);
 

test/unit/util.js

@@ -153,4 +153,41 @@ describe('Utilities', function () {
       assert.strictEqual(true, Array.isArray(sharp.vendor.installed));
     });
   });
+
+  describe('Block', () => {
+    it('Can block a named operation', () => {
+      sharp.block({ operation: ['test'] });
+    });
+    it('Can unblock a named operation', () => {
+      sharp.unblock({ operation: ['test'] });
+    });
+    it('Invalid block operation throws', () => {
+      assert.throws(() => sharp.block(1),
+        /Expected object for options but received 1 of type number/
+      );
+      assert.throws(() => sharp.block({}),
+        /Expected Array<string> for operation but received undefined of type undefined/
+      );
+      assert.throws(() => sharp.block({ operation: 'fail' }),
+        /Expected Array<string> for operation but received fail of type string/
+      );
+      assert.throws(() => sharp.block({ operation: ['maybe', false] }),
+        /Expected Array<string> for operation but received maybe,false of type object/
+      );
+    });
+    it('Invalid unblock operation throws', () => {
+      assert.throws(() => sharp.unblock(1),
+        /Expected object for options but received 1 of type number/
+      );
+      assert.throws(() => sharp.unblock({}),
+        /Expected Array<string> for operation but received undefined of type undefined/
+      );
+      assert.throws(() => sharp.unblock({ operation: 'fail' }),
+        /Expected Array<string> for operation but received fail of type string/
+      );
+      assert.throws(() => sharp.unblock({ operation: ['maybe', false] }),
+        /Expected Array<string> for operation but received maybe,false of type object/
+      );
+    });
+  });
 });