3 files changed, 329 insertions, 0 deletions
diff --git a/toolkit/components/utils/moz.build b/toolkit/components/utils/moz.build
new file mode 100644
index 0000000000..3b8c1c5755
--- /dev/null
+++ b/toolkit/components/utils/moz.build
@@ -0,0 +1,10 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+EXTRA_COMPONENTS += [
+    'simpleServices.js',
+    'utils.manifest',
+]
diff --git a/toolkit/components/utils/simpleServices.js b/toolkit/components/utils/simpleServices.js
new file mode 100644
index 0000000000..0b8dfe877c
--- /dev/null
+++ b/toolkit/components/utils/simpleServices.js
@@ -0,0 +1,313 @@
+/* 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/. */
+
+/*
+ * Dumping ground for simple services for which the isolation of a full global
+ * is overkill. Be careful about namespace pollution, and be mindful about
+ * importing lots of JSMs in global scope, since this file will almost certainly
+ * be loaded from enough callsites that any such imports will always end up getting
+ * eagerly loaded at startup.
+ */
+
+"use strict";
+
+const Cc = Components.classes;
+const Cu = Components.utils;
+const Ci = Components.interfaces;
+const Cr = Components.results;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
+                                  "resource://gre/modules/NetUtil.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+                                  "resource://gre/modules/Services.jsm");
+
+function AddonPolicyService()
+{
+  this.wrappedJSObject = this;
+  this.cspStrings = new Map();
+  this.backgroundPageUrlCallbacks = new Map();
+  this.checkHasPermissionCallbacks = new Map();
+  this.mayLoadURICallbacks = new Map();
+  this.localizeCallbacks = new Map();
+
+  XPCOMUtils.defineLazyPreferenceGetter(
+    this, "baseCSP", "extensions.webextensions.base-content-security-policy",
+    "script-src 'self' https://* moz-extension: blob: filesystem: 'unsafe-eval' 'unsafe-inline'; " +
+    "object-src 'self' https://* moz-extension: blob: filesystem:;");
+
+  XPCOMUtils.defineLazyPreferenceGetter(
+    this, "defaultCSP", "extensions.webextensions.default-content-security-policy",
+    "script-src 'self'; object-src 'self';");
+}
+
+AddonPolicyService.prototype = {
+  classID: Components.ID("{89560ed3-72e3-498d-a0e8-ffe50334d7c5}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAddonPolicyService]),
+
+  /**
+   * Returns the content security policy which applies to documents belonging
+   * to the extension with the given ID. This may be either a custom policy,
+   * if one was supplied, or the default policy if one was not.
+   */
+  getAddonCSP(aAddonId) {
+    let csp = this.cspStrings.get(aAddonId);
+    return csp || this.defaultCSP;
+  },
+
+  /**
+   * Returns the generated background page as a data-URI, if any. If the addon
+   * does not have an auto-generated background page, an empty string is
+   * returned.
+   */
+  getGeneratedBackgroundPageUrl(aAddonId) {
+    let cb = this.backgroundPageUrlCallbacks.get(aAddonId);
+    return cb && cb(aAddonId) || '';
+  },
+
+  /*
+   * Invokes a callback (if any) associated with the addon to determine whether
+   * the addon is granted the |aPerm| API permission.
+   *
+   * @see nsIAddonPolicyService.addonHasPermission
+   */
+  addonHasPermission(aAddonId, aPerm) {
+    let cb = this.checkHasPermissionCallbacks.get(aAddonId);
+    return cb ? cb(aPerm) : false;
+  },
+
+  /*
+   * Invokes a callback (if any) associated with the addon to determine whether
+   * unprivileged code running within the addon is allowed to perform loads from
+   * the given URI.
+   *
+   * @see nsIAddonPolicyService.addonMayLoadURI
+   */
+  addonMayLoadURI(aAddonId, aURI) {
+    let cb = this.mayLoadURICallbacks.get(aAddonId);
+    return cb ? cb(aURI) : false;
+  },
+
+  /*
+   * Invokes a callback (if any) associated with the addon to loclaize a
+   * resource belonging to that add-on.
+   */
+  localizeAddonString(aAddonId, aString) {
+    let cb = this.localizeCallbacks.get(aAddonId);
+    return cb ? cb(aString) : aString;
+  },
+
+  /*
+   * Invokes a callback (if any) to determine if an extension URI should be
+   * web-accessible.
+   *
+   * @see nsIAddonPolicyService.extensionURILoadableByAnyone
+   */
+  extensionURILoadableByAnyone(aURI) {
+    if (aURI.scheme != "moz-extension") {
+      throw new TypeError("non-extension URI passed");
+    }
+
+    let cb = this.extensionURILoadCallback;
+    return cb ? cb(aURI) : false;
+  },
+
+  /*
+   * Maps an extension URI to an addon ID.
+   *
+   * @see nsIAddonPolicyService.extensionURIToAddonId
+   */
+  extensionURIToAddonId(aURI) {
+    if (aURI.scheme != "moz-extension") {
+      throw new TypeError("non-extension URI passed");
+    }
+
+    let cb = this.extensionURIToAddonIdCallback;
+    if (!cb) {
+      throw new Error("no callback set to map extension URIs to addon Ids");
+    }
+    return cb(aURI);
+  },
+
+  /*
+   * Sets the callbacks used in addonHasPermission above. Not accessible over
+   * XPCOM - callers should use .wrappedJSObject on the service to call it
+   * directly.
+   */
+  setAddonHasPermissionCallback(aAddonId, aCallback) {
+    if (aCallback) {
+      this.checkHasPermissionCallbacks.set(aAddonId, aCallback);
+    } else {
+      this.checkHasPermissionCallbacks.delete(aAddonId);
+    }
+  },
+
+  /*
+   * Sets the callbacks used in addonMayLoadURI above. Not accessible over
+   * XPCOM - callers should use .wrappedJSObject on the service to call it
+   * directly.
+   */
+  setAddonLoadURICallback(aAddonId, aCallback) {
+    if (aCallback) {
+      this.mayLoadURICallbacks.set(aAddonId, aCallback);
+    } else {
+      this.mayLoadURICallbacks.delete(aAddonId);
+    }
+  },
+
+  /*
+   * Sets the custom CSP string to be used for the add-on. Not accessible over
+   * XPCOM - callers should use .wrappedJSObject on the service to call it
+   * directly.
+   */
+  setAddonCSP(aAddonId, aCSPString) {
+    if (aCSPString) {
+      this.cspStrings.set(aAddonId, aCSPString);
+    } else {
+      this.cspStrings.delete(aAddonId);
+    }
+  },
+
+  /**
+   * Set the callback that generates a data-URL for the background page.
+   */
+  setBackgroundPageUrlCallback(aAddonId, aCallback) {
+    if (aCallback) {
+      this.backgroundPageUrlCallbacks.set(aAddonId, aCallback);
+    } else {
+      this.backgroundPageUrlCallbacks.delete(aAddonId);
+    }
+  },
+
+  /*
+   * Sets the callbacks used by the stream converter service to localize
+   * add-on resources.
+   */
+  setAddonLocalizeCallback(aAddonId, aCallback) {
+    if (aCallback) {
+      this.localizeCallbacks.set(aAddonId, aCallback);
+    } else {
+      this.localizeCallbacks.delete(aAddonId);
+    }
+  },
+
+  /*
+   * Sets the callback used in extensionURILoadableByAnyone above. Not
+   * accessible over XPCOM - callers should use .wrappedJSObject on the
+   * service to call it directly.
+   */
+  setExtensionURILoadCallback(aCallback) {
+    var old = this.extensionURILoadCallback;
+    this.extensionURILoadCallback = aCallback;
+    return old;
+  },
+
+  /*
+   * Sets the callback used in extensionURIToAddonId above. Not accessible over
+   * XPCOM - callers should use .wrappedJSObject on the service to call it
+   * directly.
+   */
+  setExtensionURIToAddonIdCallback(aCallback) {
+    var old = this.extensionURIToAddonIdCallback;
+    this.extensionURIToAddonIdCallback = aCallback;
+    return old;
+  }
+};
+
+/*
+ * This class provides a stream filter for locale messages in CSS files served
+ * by the moz-extension: protocol handler.
+ *
+ * See SubstituteChannel in netwerk/protocol/res/ExtensionProtocolHandler.cpp
+ * for usage.
+ */
+function AddonLocalizationConverter()
+{
+  this.aps = Cc["@mozilla.org/addons/policy-service;1"].getService(Ci.nsIAddonPolicyService)
+    .wrappedJSObject;
+}
+
+AddonLocalizationConverter.prototype = {
+  classID: Components.ID("{ded150e3-c92e-4077-a396-0dba9953e39f}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIStreamConverter]),
+
+  FROM_TYPE: "application/vnd.mozilla.webext.unlocalized",
+  TO_TYPE: "text/css",
+
+  checkTypes(aFromType, aToType) {
+    if (aFromType != this.FROM_TYPE) {
+      throw Components.Exception("Invalid aFromType value", Cr.NS_ERROR_INVALID_ARG,
+                                 Components.stack.caller.caller);
+    }
+    if (aToType != this.TO_TYPE) {
+      throw Components.Exception("Invalid aToType value", Cr.NS_ERROR_INVALID_ARG,
+                                 Components.stack.caller.caller);
+    }
+  },
+
+  // aContext must be a nsIURI object for a valid moz-extension: URL.
+  getAddonId(aContext) {
+    // In this case, we want the add-on ID even if the URL is web accessible,
+    // so check the root rather than the exact path.
+    let uri = Services.io.newURI("/", null, aContext);
+
+    let id = this.aps.extensionURIToAddonId(uri);
+    if (id == undefined) {
+      throw new Components.Exception("Invalid context", Cr.NS_ERROR_INVALID_ARG);
+    }
+    return id;
+  },
+
+  convertToStream(aAddonId, aString) {
+    let stream = Cc["@mozilla.org/io/string-input-stream;1"]
+      .createInstance(Ci.nsIStringInputStream);
+
+    stream.data = this.aps.localizeAddonString(aAddonId, aString);
+    return stream;
+  },
+
+  convert(aStream, aFromType, aToType, aContext) {
+    this.checkTypes(aFromType, aToType);
+    let addonId = this.getAddonId(aContext);
+
+    let string = (
+      aStream.available() ?
+      NetUtil.readInputStreamToString(aStream, aStream.available()): ""
+    );
+    return this.convertToStream(addonId, string);
+  },
+
+  asyncConvertData(aFromType, aToType, aListener, aContext) {
+    this.checkTypes(aFromType, aToType);
+    this.addonId = this.getAddonId(aContext);
+    this.listener = aListener;
+  },
+
+  onStartRequest(aRequest, aContext) {
+    this.parts = [];
+  },
+
+  onDataAvailable(aRequest, aContext, aInputStream, aOffset, aCount) {
+    this.parts.push(NetUtil.readInputStreamToString(aInputStream, aCount));
+  },
+
+  onStopRequest(aRequest, aContext, aStatusCode) {
+    try {
+      this.listener.onStartRequest(aRequest, null);
+      if (Components.isSuccessCode(aStatusCode)) {
+        let string = this.parts.join("");
+        let stream = this.convertToStream(this.addonId, string);
+
+        this.listener.onDataAvailable(aRequest, null, stream, 0, stream.data.length);
+      }
+    } catch (e) {
+      aStatusCode = e.result || Cr.NS_ERROR_FAILURE;
+    }
+    this.listener.onStopRequest(aRequest, null, aStatusCode);
+  },
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([AddonPolicyService,
+                                                     AddonLocalizationConverter]);
diff --git a/toolkit/components/utils/utils.manifest b/toolkit/components/utils/utils.manifest
new file mode 100644
index 0000000000..b2d30bd98d
--- /dev/null
+++ b/toolkit/components/utils/utils.manifest
@@ -0,0 +1,6 @@
+component {dfd07380-6083-11e4-9803-0800200c9a66} simpleServices.js
+contract @mozilla.org/addons/remote-tag-service;1 {dfd07380-6083-11e4-9803-0800200c9a66}
+component {89560ed3-72e3-498d-a0e8-ffe50334d7c5} simpleServices.js
+contract @mozilla.org/addons/policy-service;1 {89560ed3-72e3-498d-a0e8-ffe50334d7c5}
+component {ded150e3-c92e-4077-a396-0dba9953e39f} simpleServices.js
+contract @mozilla.org/streamconv;1?from=application/vnd.mozilla.webext.unlocalized&to=text/css {ded150e3-c92e-4077-a396-0dba9953e39f}