1 files changed, 223 insertions, 0 deletions
diff --git a/b2g/components/FilePicker.js b/b2g/components/FilePicker.js
new file mode 100644
index 000000000..803eef681
--- /dev/null
+++ b/b2g/components/FilePicker.js
@@ -0,0 +1,223 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * No magic constructor behaviour, as is de rigeur for XPCOM.
+ * If you must perform some initialization, and it could possibly fail (even
+ * due to an out-of-memory condition), you should use an Init method, which
+ * can convey failure appropriately (thrown exception in JS,
+ * NS_FAILED(nsresult) return in C++).
+ *
+ * In JS, you can actually cheat, because a thrown exception will cause the
+ * CreateInstance call to fail in turn, but not all languages are so lucky.
+ * (Though ANSI C++ provides exceptions, they are verboten in Mozilla code
+ * for portability reasons -- and even when you're building completely
+ * platform-specific code, you can't throw across an XPCOM method boundary.)
+ */
+
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+
+// FIXME: improve this list of filters.
+const IMAGE_FILTERS = ['image/gif', 'image/jpeg', 'image/pjpeg',
+                       'image/png', 'image/svg+xml', 'image/tiff',
+                       'image/vnd.microsoft.icon'];
+const VIDEO_FILTERS = ['video/mpeg', 'video/mp4', 'video/ogg',
+                       'video/quicktime', 'video/webm', 'video/x-matroska',
+                       'video/x-ms-wmv', 'video/x-flv'];
+const AUDIO_FILTERS = ['audio/basic', 'audio/L24', 'audio/mp4',
+                       'audio/mpeg', 'audio/ogg', 'audio/vorbis',
+                       'audio/vnd.rn-realaudio', 'audio/vnd.wave',
+                       'audio/webm'];
+
+Cu.import('resource://gre/modules/XPCOMUtils.jsm');
+Cu.import("resource://gre/modules/osfile.jsm");
+
+XPCOMUtils.defineLazyServiceGetter(this, 'cpmm',
+                                   '@mozilla.org/childprocessmessagemanager;1',
+                                   'nsIMessageSender');
+
+function FilePicker() {
+}
+
+FilePicker.prototype = {
+  classID: Components.ID('{436ff8f9-0acc-4b11-8ec7-e293efba3141}'),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIFilePicker]),
+
+  /* members */
+
+  mParent: undefined,
+  mExtraProps: undefined,
+  mFilterTypes: undefined,
+  mFileEnumerator: undefined,
+  mFilePickerShownCallback: undefined,
+
+  /* methods */
+
+  init: function(parent, title, mode) {
+    this.mParent = parent;
+    this.mExtraProps = {};
+    this.mFilterTypes = [];
+    this.mMode = mode;
+
+    if (mode != Ci.nsIFilePicker.modeOpen &&
+        mode != Ci.nsIFilePicker.modeOpenMultiple) {
+      throw Cr.NS_ERROR_NOT_IMPLEMENTED;
+    }
+  },
+
+  /* readonly attribute nsILocalFile file - not implemented; */
+  /* readonly attribute nsISimpleEnumerator files - not implemented; */
+  /* readonly attribute nsIURI fileURL - not implemented; */
+
+  get domFileOrDirectoryEnumerator() {
+    return this.mFilesEnumerator;
+  },
+
+  // We don't support directory selection yet.
+  get domFileOrDirectory() {
+    return this.mFilesEnumerator ? this.mFilesEnumerator.mFiles[0] : null;
+  },
+
+  get mode() {
+    return this.mMode;
+  },
+
+  appendFilters: function(filterMask) {
+    // Ci.nsIFilePicker.filterHTML is not supported
+    // Ci.nsIFilePicker.filterText is not supported
+
+    if (filterMask & Ci.nsIFilePicker.filterImages) {
+      this.mFilterTypes = this.mFilterTypes.concat(IMAGE_FILTERS);
+      // This property is needed for the gallery app pick activity.
+      this.mExtraProps['nocrop'] = true;
+    }
+
+    // Ci.nsIFilePicker.filterXML is not supported
+    // Ci.nsIFilePicker.filterXUL is not supported
+    // Ci.nsIFilePicker.filterApps is not supported
+    // Ci.nsIFilePicker.filterAllowURLs is not supported
+
+    if (filterMask & Ci.nsIFilePicker.filterVideo) {
+      this.mFilterTypes = this.mFilterTypes.concat(VIDEO_FILTERS);
+    }
+
+    if (filterMask & Ci.nsIFilePicker.filterAudio) {
+      this.mFilterTypes = this.mFilterTypes.concat(AUDIO_FILTERS);
+    }
+
+    if (filterMask & Ci.nsIFilePicker.filterAll) {
+      // This property is needed for the gallery app pick activity.
+      this.mExtraProps['nocrop'] = true;
+    }
+  },
+
+  appendFilter: function(title, extensions) {
+    // pick activity doesn't support extensions
+  },
+
+  open: function(aFilePickerShownCallback) {
+    this.mFilePickerShownCallback = aFilePickerShownCallback;
+
+    cpmm.addMessageListener('file-picked', this);
+
+    let detail = {};
+    if (this.mFilterTypes) {
+       detail.type = this.mFilterTypes;
+    }
+
+    for (let prop in this.mExtraProps) {
+      if (!(prop in detail)) {
+        detail[prop] = this.mExtraProps[prop];
+      }
+    }
+
+    cpmm.sendAsyncMessage('file-picker', detail);
+  },
+
+  fireSuccess: function(file) {
+    this.mFilesEnumerator = {
+      QueryInterface: XPCOMUtils.generateQI([Ci.nsISimpleEnumerator]),
+
+      mFiles: [file],
+      mIndex: 0,
+
+      hasMoreElements: function() {
+        return (this.mIndex < this.mFiles.length);
+      },
+
+      getNext: function() {
+        if (this.mIndex >= this.mFiles.length) {
+          throw Components.results.NS_ERROR_FAILURE;
+        }
+        return this.mFiles[this.mIndex++];
+      }
+    };
+
+    if (this.mFilePickerShownCallback) {
+      this.mFilePickerShownCallback.done(Ci.nsIFilePicker.returnOK);
+      this.mFilePickerShownCallback = null;
+    }
+  },
+
+  fireError: function() {
+    if (this.mFilePickerShownCallback) {
+      this.mFilePickerShownCallback.done(Ci.nsIFilePicker.returnCancel);
+      this.mFilePickerShownCallback = null;
+    }
+  },
+
+  receiveMessage: function(message) {
+    if (message.name !== 'file-picked') {
+      return;
+    }
+
+    cpmm.removeMessageListener('file-picked', this);
+
+    let data = message.data;
+    if (!data.success || !data.result.blob) {
+      this.fireError();
+      return;
+    }
+
+    // The name to be shown can be part of the message, or can be taken from
+    // the File (if the blob is a File).
+    let name = data.result.name;
+    if (!name &&
+        (data.result.blob instanceof this.mParent.File) &&
+        data.result.blob.name) {
+      name = data.result.blob.name;
+    }
+
+    // Let's try to remove the full path and take just the filename.
+    if (name) {
+      let names = OS.Path.split(name);
+      name = names.components[names.components.length - 1];
+    }
+
+    // the fallback is a filename composed by 'blob' + extension.
+    if (!name) {
+      name = 'blob';
+      if (data.result.blob.type) {
+        let mimeSvc = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+        let mimeInfo = mimeSvc.getFromTypeAndExtension(data.result.blob.type, '');
+        if (mimeInfo) {
+          name += '.' + mimeInfo.primaryExtension;
+        }
+      }
+    }
+
+    let file = new this.mParent.File([data.result.blob],
+                                     name,
+                                     { type: data.result.blob.type });
+
+    if (file) {
+      this.fireSuccess(file);
+    } else {
+      this.fireError();
+    }
+  }
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([FilePicker]);