1 files changed, 337 insertions, 0 deletions
diff --git a/toolkit/jetpack/sdk/clipboard.js b/toolkit/jetpack/sdk/clipboard.js
new file mode 100644
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+++ b/toolkit/jetpack/sdk/clipboard.js
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+/* 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/. */
+
+"use strict";
+
+module.metadata = {
+  "stability": "stable",
+  "engines": {
+    // TODO Fennec Support 789757
+    "Firefox": "*",
+    "SeaMonkey": "*",
+    "Thunderbird": "*"
+  }
+};
+
+const { Cc, Ci } = require("chrome");
+const { DataURL } = require("./url");
+const apiUtils = require("./deprecated/api-utils");
+/*
+While these data flavors resemble Internet media types, they do
+no directly map to them.
+*/
+const kAllowableFlavors = [
+  "text/unicode",
+  "text/html",
+  "image/png"
+  /* CURRENTLY UNSUPPORTED FLAVORS
+  "text/plain",
+  "image/jpg",
+  "image/jpeg",
+  "image/gif",
+  "text/x-moz-text-internal",
+  "AOLMAIL",
+  "application/x-moz-file",
+  "text/x-moz-url",
+  "text/x-moz-url-data",
+  "text/x-moz-url-desc",
+  "text/x-moz-url-priv",
+  "application/x-moz-nativeimage",
+  "application/x-moz-nativehtml",
+  "application/x-moz-file-promise-url",
+  "application/x-moz-file-promise-dest-filename",
+  "application/x-moz-file-promise",
+  "application/x-moz-file-promise-dir"
+  */
+];
+
+/*
+Aliases for common flavors. Not all flavors will
+get an alias. New aliases must be approved by a
+Jetpack API druid.
+*/
+const kFlavorMap = [
+  { short: "text", long: "text/unicode" },
+  { short: "html", long: "text/html" },
+  { short: "image", long: "image/png" }
+];
+
+var clipboardService = Cc["@mozilla.org/widget/clipboard;1"].
+                       getService(Ci.nsIClipboard);
+
+var clipboardHelper = Cc["@mozilla.org/widget/clipboardhelper;1"].
+                      getService(Ci.nsIClipboardHelper);
+
+var imageTools = Cc["@mozilla.org/image/tools;1"].
+               getService(Ci.imgITools);
+
+exports.set = function(aData, aDataType) {
+
+  let options = {
+    data: aData,
+    datatype: aDataType || "text"
+  };
+
+  // If `aDataType` is not given or if it's "image", the data is parsed as
+  // data URL to detect a better datatype
+  if (aData && (!aDataType || aDataType === "image")) {
+    try {
+      let dataURL = new DataURL(aData);
+
+      options.datatype = dataURL.mimeType;
+      options.data = dataURL.data;
+    }
+    catch (e) {
+      // Ignore invalid URIs
+      if (e.name !== "URIError") {
+        throw e;
+      }
+    }
+  }
+
+  options = apiUtils.validateOptions(options, {
+    data: {
+      is: ["string"]
+    },
+    datatype: {
+      is: ["string"]
+    }
+  });
+
+  let flavor = fromJetpackFlavor(options.datatype);
+
+  if (!flavor)
+    throw new Error("Invalid flavor for " + options.datatype);
+
+  // Additional checks for using the simple case
+  if (flavor == "text/unicode") {
+    clipboardHelper.copyString(options.data);
+    return true;
+  }
+
+  // Below are the more complex cases where we actually have to work with a
+  // nsITransferable object
+  var xferable = Cc["@mozilla.org/widget/transferable;1"].
+                 createInstance(Ci.nsITransferable);
+  if (!xferable)
+    throw new Error("Couldn't set the clipboard due to an internal error " +
+                    "(couldn't create a Transferable object).");
+  // Bug 769440: Starting with FF16, transferable have to be inited
+  if ("init" in xferable)
+    xferable.init(null);
+
+  switch (flavor) {
+    case "text/html":
+      // add text/html flavor
+      let str = Cc["@mozilla.org/supports-string;1"].
+                 createInstance(Ci.nsISupportsString);
+
+      str.data = options.data;
+      xferable.addDataFlavor(flavor);
+      xferable.setTransferData(flavor, str, str.data.length * 2);
+
+      // add a text/unicode flavor (html converted to plain text)
+      str = Cc["@mozilla.org/supports-string;1"].
+               createInstance(Ci.nsISupportsString);
+      let converter = Cc["@mozilla.org/feed-textconstruct;1"].
+                     createInstance(Ci.nsIFeedTextConstruct);
+
+      converter.type = "html";
+      converter.text = options.data;
+      str.data = converter.plainText();
+      xferable.addDataFlavor("text/unicode");
+      xferable.setTransferData("text/unicode", str, str.data.length * 2);
+      break;
+
+    // Set images to the clipboard is not straightforward, to have an idea how
+    // it works on platform side, see:
+    // http://mxr.mozilla.org/mozilla-central/source/content/base/src/nsCopySupport.cpp?rev=7857c5bff017#530
+    case "image/png":
+      let image = options.data;
+
+      let container = {};
+
+      try {
+        let input = Cc["@mozilla.org/io/string-input-stream;1"].
+                      createInstance(Ci.nsIStringInputStream);
+
+        input.setData(image, image.length);
+
+        imageTools.decodeImageData(input, flavor, container);
+      }
+      catch (e) {
+        throw new Error("Unable to decode data given in a valid image.");
+      }
+
+      // Store directly the input stream makes the cliboard's data available
+      // for Firefox but not to the others application or to the OS. Therefore,
+      // a `nsISupportsInterfacePointer` object that reference an `imgIContainer`
+      // with the image is needed.
+      var imgPtr = Cc["@mozilla.org/supports-interface-pointer;1"].
+                     createInstance(Ci.nsISupportsInterfacePointer);
+
+      imgPtr.data = container.value;
+
+      xferable.addDataFlavor(flavor);
+      xferable.setTransferData(flavor, imgPtr, -1);
+
+      break;
+    default:
+      throw new Error("Unable to handle the flavor " + flavor + ".");
+  }
+
+  // TODO: Not sure if this will ever actually throw. -zpao
+  try {
+    clipboardService.setData(
+      xferable,
+      null,
+      clipboardService.kGlobalClipboard
+    );
+  } catch (e) {
+    throw new Error("Couldn't set clipboard data due to an internal error: " + e);
+  }
+  return true;
+};
+
+
+exports.get = function(aDataType) {
+  let options = {
+    datatype: aDataType
+  };
+
+  // Figure out the best data type for the clipboard's data, if omitted
+  if (!aDataType) {
+    if (~currentFlavors().indexOf("image"))
+      options.datatype = "image";
+    else
+      options.datatype = "text";
+  }
+
+  options = apiUtils.validateOptions(options, {
+    datatype: {
+      is: ["string"]
+    }
+  });
+
+  var xferable = Cc["@mozilla.org/widget/transferable;1"].
+                 createInstance(Ci.nsITransferable);
+  if (!xferable)
+    throw new Error("Couldn't set the clipboard due to an internal error " +
+                    "(couldn't create a Transferable object).");
+  // Bug 769440: Starting with FF16, transferable have to be inited
+  if ("init" in xferable)
+    xferable.init(null);
+
+  var flavor = fromJetpackFlavor(options.datatype);
+
+  // Ensure that the user hasn't requested a flavor that we don't support.
+  if (!flavor)
+    throw new Error("Getting the clipboard with the flavor '" + flavor +
+                    "' is not supported.");
+
+  // TODO: Check for matching flavor first? Probably not worth it.
+
+  xferable.addDataFlavor(flavor);
+  // Get the data into our transferable.
+  clipboardService.getData(
+    xferable,
+    clipboardService.kGlobalClipboard
+  );
+
+  var data = {};
+  var dataLen = {};
+  try {
+    xferable.getTransferData(flavor, data, dataLen);
+  } catch (e) {
+    // Clipboard doesn't contain data in flavor, return null.
+    return null;
+  }
+
+  // There's no data available, return.
+  if (data.value === null)
+    return null;
+
+  // TODO: Add flavors here as we support more in kAllowableFlavors.
+  switch (flavor) {
+    case "text/unicode":
+    case "text/html":
+      data = data.value.QueryInterface(Ci.nsISupportsString).data;
+      break;
+    case "image/png":
+      let dataURL = new DataURL();
+
+      dataURL.mimeType = flavor;
+      dataURL.base64 = true;
+
+      let image = data.value;
+
+      // Due to the differences in how images could be stored in the clipboard
+      // the checks below are needed. The clipboard could already provide the
+      // image as byte streams, but also as pointer, or as image container.
+      // If it's not possible obtain a byte stream, the function returns `null`.
+      if (image instanceof Ci.nsISupportsInterfacePointer)
+        image = image.data;
+
+      if (image instanceof Ci.imgIContainer)
+        image = imageTools.encodeImage(image, flavor);
+
+      if (image instanceof Ci.nsIInputStream) {
+        let binaryStream = Cc["@mozilla.org/binaryinputstream;1"].
+                              createInstance(Ci.nsIBinaryInputStream);
+
+        binaryStream.setInputStream(image);
+
+        dataURL.data = binaryStream.readBytes(binaryStream.available());
+
+        data = dataURL.toString();
+      }
+      else
+        data = null;
+
+      break;
+    default:
+      data = null;
+  }
+
+  return data;
+};
+
+function currentFlavors() {
+  // Loop over kAllowableFlavors, calling hasDataMatchingFlavors for each.
+  // This doesn't seem like the most efficient way, but we can't get
+  // confirmation for specific flavors any other way. This is supposed to be
+  // an inexpensive call, so performance shouldn't be impacted (much).
+  var currentFlavors = [];
+  for (var flavor of kAllowableFlavors) {
+    var matches = clipboardService.hasDataMatchingFlavors(
+      [flavor],
+      1,
+      clipboardService.kGlobalClipboard
+    );
+    if (matches)
+      currentFlavors.push(toJetpackFlavor(flavor));
+  }
+  return currentFlavors;
+};
+
+Object.defineProperty(exports, "currentFlavors", { get : currentFlavors });
+
+// SUPPORT FUNCTIONS ////////////////////////////////////////////////////////
+
+function toJetpackFlavor(aFlavor) {
+  for (let flavorMap of kFlavorMap)
+    if (flavorMap.long == aFlavor)
+      return flavorMap.short;
+  // Return null in the case where we don't match
+  return null;
+}
+
+function fromJetpackFlavor(aJetpackFlavor) {
+  // TODO: Handle proper flavors better
+  for (let flavorMap of kFlavorMap)
+    if (flavorMap.short == aJetpackFlavor || flavorMap.long == aJetpackFlavor)
+      return flavorMap.long;
+  // Return null in the case where we don't match.
+  return null;
+}