From b72cf7c04bd9fc31b4ef4537eba563a3abf54827 Mon Sep 17 00:00:00 2001
From: alecmerdler <merdlera@oregonstate.edu>
Date: Sat, 11 Mar 2017 15:47:44 -0800
Subject: [PATCH] refactoring DatafileService

---
 .../datafile/datafile.service.impl.spec.ts    |  26 ++++
 .../datafile/datafile.service.impl.ts         | 134 ++++++++++++++++++
 2 files changed, 160 insertions(+)

diff --git a/static/js/services/datafile/datafile.service.impl.spec.ts b/static/js/services/datafile/datafile.service.impl.spec.ts
index e69de29bb..afdd14f6c 100644
--- a/static/js/services/datafile/datafile.service.impl.spec.ts
+++ b/static/js/services/datafile/datafile.service.impl.spec.ts
@@ -0,0 +1,26 @@
+import { DatafileServiceImpl } from './datafile.service.impl';
+
+
+describe("DatafileServiceImpl", () => {
+  var datafileServiceImpl: DatafileServiceImpl;
+
+  beforeEach(() => {
+    datafileServiceImpl = new DatafileServiceImpl();
+  });
+
+  describe("blobToString", () => {
+
+  });
+
+  describe("arrayToString", () => {
+
+  });
+
+  describe("readDataArrayAsPossibleArchive", () => {
+
+  });
+
+  describe("downloadDataFileAsArrayBuffer", () => {
+
+  });
+});
\ No newline at end of file
diff --git a/static/js/services/datafile/datafile.service.impl.ts b/static/js/services/datafile/datafile.service.impl.ts
index e69de29bb..14e611a73 100644
--- a/static/js/services/datafile/datafile.service.impl.ts
+++ b/static/js/services/datafile/datafile.service.impl.ts
@@ -0,0 +1,134 @@
+import { DatafileService } from './datafile.service';
+declare const JSZip: (buf: any) => void;
+declare const Zlib: any;
+declare const Untar: (uint8Array: Uint8Array) => void;
+
+
+export class DatafileServiceImpl implements DatafileService {
+
+  public blobToString(blob: any, callback: (result: string) => void): void {
+
+  }
+
+  public arrayToString(buf: any, callback: (result: string) => void): void {
+
+  }
+
+  public readDataArrayAsPossibleArchive(buf: any,
+                                        success: (result: any) => void,
+                                        failure: (error: any) => void): void {
+
+  }
+
+  public downloadDataFileAsArrayBuffer($scope: ng.IScope,
+                                       url: string,
+                                       progress: (percent: number) => void,
+                                       error: () => void,
+                                       loaded: (uint8array: Uint8Array) => void): void {
+
+  }
+
+  private getName(filePath: string): string {
+    var parts: string[] = filePath.split('/');
+
+    return parts[parts.length - 1];
+  }
+
+  private tryAsZip(buf: any, success: (result: any) => void, failure: (error?: any) => void): void {
+    var zip = null;
+    var zipFiles = null;
+    try {
+      var zip = new JSZip(buf);
+      zipFiles = zip.files;
+    } catch (e) {
+      failure();
+      return;
+    }
+
+    var files = [];
+    for (var filePath in zipFiles) {
+      if (zipFiles.hasOwnProperty(filePath)) {
+        files.push({
+          'name': this.getName(filePath),
+          'path': filePath,
+          'canRead': true,
+          'toBlob': (function(fp) {
+            return function() {
+              return new Blob([zip.file(fp).asArrayBuffer()]);
+            };
+          }(filePath))
+        });
+      }
+    }
+
+    success(files);
+  }
+
+  private tryAsTarGz(buf: any, success: (result: any) => void, failure: (error?: any) => void): void {
+    var gunzip = new Zlib.Gunzip(new Uint8Array(buf));
+    var plain = null;
+
+    try {
+      plain = gunzip.decompress();
+    } catch (e) {
+      failure();
+      return;
+    }
+
+    if (plain.byteLength == 0) {
+      plain = buf;
+    }
+
+    this.tryAsTar(plain, success, failure);
+  }
+
+  private tryAsTar(buf: any, success: (result: any) => void, failure: (error?: any) => void): void {
+    var collapsePath = function(originalPath) {
+      // Tar files can contain entries of the form './', so we need to collapse
+      // those paths down.
+      var parts = originalPath.split('/');
+      for (var i = parts.length - 1; i >= 0; i--) {
+        var part = parts[i];
+        if (part == '.') {
+          parts.splice(i, 1);
+        }
+      }
+      return parts.join('/');
+    };
+
+    try {
+      var handler = new Untar(new Uint8Array(buf));
+      handler.process((status, read, files, err) => {
+        switch (status) {
+          case 'error':
+            failure(err);
+            break;
+
+          case 'done':
+            var processed = [];
+            for (var i = 0; i < files.length; ++i) {
+              var currentFile = files[i];
+              var path = collapsePath(currentFile.meta.filename);
+
+              if (path == '' || path == 'pax_global_header') { continue; }
+
+              processed.push({
+                'name': this.getName(path),
+                'path': path,
+                'canRead': true,
+                'toBlob': (function(currentFile) {
+                  return function() {
+                    return new Blob([currentFile.buffer], {type: 'application/octet-binary'});
+                  };
+                }(currentFile))
+              });
+            }
+            success(processed);
+            break;
+        }
+      });
+    } catch (e) {
+      failure();
+    }
+  }
+}
\ No newline at end of file