5 files changed, 53 insertions, 7 deletions
diff --git a/packages/sol-compiler/CHANGELOG.json b/packages/sol-compiler/CHANGELOG.json
index 33fd99e4f..e0ebd3a2d 100644
--- a/packages/sol-compiler/CHANGELOG.json
+++ b/packages/sol-compiler/CHANGELOG.json
@@ -1,5 +1,19 @@
 [
     {
+        "version": "0.5.1",
+        "changes": [
+            {
+                "note": "Make `opts` constructor parameter optional",
+                "pr": 621
+            },
+            {
+                "note": "Add schema validation for compiler configuration",
+                "pr": 621
+            }
+        ],
+        "timestamp": 1527009133
+    },
+    {
         "version": "0.5.0",
         "changes": [
             {
diff --git a/packages/sol-compiler/package.json b/packages/sol-compiler/package.json
index 7e55d718d..a74e4ae3e 100644
--- a/packages/sol-compiler/package.json
+++ b/packages/sol-compiler/package.json
@@ -72,6 +72,7 @@
         "zeppelin-solidity": "1.8.0"
     },
     "dependencies": {
+        "@0xproject/assert": "0.2.10",
         "@0xproject/json-schemas": "0.7.22",
         "@0xproject/sol-resolver": "^0.0.5",
         "@0xproject/types": "^0.7.0",
diff --git a/packages/sol-compiler/src/cli.ts b/packages/sol-compiler/src/cli.ts
index d107e8b37..b97cf4cab 100644
--- a/packages/sol-compiler/src/cli.ts
+++ b/packages/sol-compiler/src/cli.ts
@@ -35,7 +35,7 @@ const SEPARATOR = ',';
         : argv.contracts === DEFAULT_CONTRACTS_LIST
             ? DEFAULT_CONTRACTS_LIST
             : argv.contracts.split(SEPARATOR);
-    const opts: CompilerOptions = {
+    const opts = {
         contractsDir: argv.contractsDir,
         artifactsDir: argv.artifactsDir,
         contracts,
diff --git a/packages/sol-compiler/src/compiler.ts b/packages/sol-compiler/src/compiler.ts
index 2ebc5228e..1d5bdb940 100644
--- a/packages/sol-compiler/src/compiler.ts
+++ b/packages/sol-compiler/src/compiler.ts
@@ -1,3 +1,4 @@
+import { assert } from '@0xproject/assert';
 import {
     ContractSource,
     ContractSources,
@@ -22,6 +23,7 @@ import * as requireFromString from 'require-from-string';
 import * as semver from 'semver';
 import solc = require('solc');
 
+import { compilerOptionsSchema } from './schemas/compiler_options_schema';
 import { binPaths } from './solc/bin_paths';
 import {
     createDirIfDoesNotExistAsync,
@@ -80,16 +82,19 @@ export class Compiler {
      * Instantiates a new instance of the Compiler class.
      * @return An instance of the Compiler class.
      */
-    constructor(opts: CompilerOptions) {
+    constructor(opts?: CompilerOptions) {
+        assert.doesConformToSchema('opts', opts, compilerOptionsSchema);
         // TODO: Look for config file in parent directories if not found in current directory
         const config: CompilerOptions = fs.existsSync(CONFIG_FILE)
             ? JSON.parse(fs.readFileSync(CONFIG_FILE).toString())
             : {};
-        this._contractsDir = opts.contractsDir || config.contractsDir || DEFAULT_CONTRACTS_DIR;
-        this._solcVersionIfExists = opts.solcVersion || config.solcVersion;
-        this._compilerSettings = opts.compilerSettings || config.compilerSettings || DEFAULT_COMPILER_SETTINGS;
-        this._artifactsDir = opts.artifactsDir || config.artifactsDir || DEFAULT_ARTIFACTS_DIR;
-        this._specifiedContracts = opts.contracts || config.contracts || ALL_CONTRACTS_IDENTIFIER;
+        const passedOpts = opts || {};
+        assert.doesConformToSchema('compiler.json', config, compilerOptionsSchema);
+        this._contractsDir = passedOpts.contractsDir || config.contractsDir || DEFAULT_CONTRACTS_DIR;
+        this._solcVersionIfExists = passedOpts.solcVersion || config.solcVersion;
+        this._compilerSettings = passedOpts.compilerSettings || config.compilerSettings || DEFAULT_COMPILER_SETTINGS;
+        this._artifactsDir = passedOpts.artifactsDir || config.artifactsDir || DEFAULT_ARTIFACTS_DIR;
+        this._specifiedContracts = passedOpts.contracts || config.contracts || ALL_CONTRACTS_IDENTIFIER;
         this._nameResolver = new NameResolver(path.resolve(this._contractsDir));
         const resolver = new FallthroughResolver();
         resolver.appendResolver(new URLResolver());
diff --git a/packages/sol-compiler/src/schemas/compiler_options_schema.ts b/packages/sol-compiler/src/schemas/compiler_options_schema.ts
new file mode 100644
index 000000000..43a9c0879
--- /dev/null
+++ b/packages/sol-compiler/src/schemas/compiler_options_schema.ts
@@ -0,0 +1,26 @@
+export const compilerOptionsSchema = {
+    id: '/CompilerOptions',
+    properties: {
+        contractsDir: { type: 'string' },
+        artifactsDir: { type: 'string' },
+        solcVersion: { type: 'string', pattern: '^d+.d+.d+$' },
+        compilerSettings: { type: 'object' },
+        contracts: {
+            oneOf: [
+                {
+                    type: 'string',
+                    pattern: '^\\*$',
+                },
+                {
+                    type: 'array',
+                    items: {
+                        type: 'string',
+                    },
+                },
+            ],
+        },
+    },
+    type: 'object',
+    required: [],
+    additionalProperties: false,
+};