feat(compressedbinarydata): validation on compressedBinary data

https://coveord.atlassian.net/browse/CDX-303

src/documentBuilder.ts

@@ -72,7 +72,7 @@ export class DocumentBuilder {
     data: string,
     compressionType: CompressionType
   ) {
-    //TODO: Validate data (length ? base64 ?)
+    this.validateCompressedBinaryData(data);
     this.doc.compressedBinaryData = {
       data,
       compressionType,
@@ -194,6 +194,7 @@ export class DocumentBuilder {
     const out = {
       ...this.doc,
       ...this.marshalMetadata(),
+      ...this.marshalCompressedBinaryData(),
       ...this.marshalPermissions(),
     };
     delete out.metadata;
@@ -211,6 +212,16 @@ export class DocumentBuilder {
     return out;
   }
 
+  private marshalCompressedBinaryData() {
+    if (!this.doc.compressedBinaryData) {
+      return {};
+    }
+    return {
+      compressedBinaryData: this.doc.compressedBinaryData.data,
+      compressionType: this.doc.compressedBinaryData.compressionType,
+    };
+  }
+
   private marshalPermissions() {
     if (!this.doc.permissions) {
       return '';
@@ -245,6 +256,13 @@ export class DocumentBuilder {
     return validatedDate.toISOString();
   }
 
+  private validateCompressedBinaryData(data: string) {
+    const isBase64 = Buffer.from(data, 'base64').toString('base64') === data;
+    if (!isBase64) {
+      throw 'Invalid compressedBinaryData: When using compressedBinaryData, the data must be base64 encoded.';
+    }
+  }
+
   private setPermission(
     securityIdentityBuilder: SecurityIdentityBuilder,
     permissionSection: 'allowedPermissions' | 'deniedPermissions'