1 files changed, 820 insertions, 0 deletions
diff --git a/mobile/android/components/geckoview/GeckoViewPrompt.jsm b/mobile/android/components/geckoview/GeckoViewPrompt.jsm
new file mode 100644
index 0000000000..6e8d5a5984
--- /dev/null
+++ b/mobile/android/components/geckoview/GeckoViewPrompt.jsm
@@ -0,0 +1,820 @@
+/* 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";
+
+var EXPORTED_SYMBOLS = ["PromptFactory"];
+
+const { GeckoViewUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/GeckoViewUtils.sys.mjs"
+);
+
+const lazy = {};
+
+ChromeUtils.defineESModuleGetters(lazy, {
+  DeferredTask: "resource://gre/modules/DeferredTask.sys.mjs",
+  GeckoViewPrompter: "resource://gre/modules/GeckoViewPrompter.sys.mjs",
+});
+
+const { debug, warn } = GeckoViewUtils.initLogging("GeckoViewPrompt");
+
+class PromptFactory {
+  constructor() {
+    this.wrappedJSObject = this;
+  }
+
+  handleEvent(aEvent) {
+    switch (aEvent.type) {
+      case "mozshowdropdown":
+      case "mozshowdropdown-sourcetouch":
+        this._handleSelect(aEvent.composedTarget, /* aIsDropDown = */ true);
+        break;
+      case "MozOpenDateTimePicker":
+        this._handleDateTime(aEvent.composedTarget);
+        break;
+      case "click":
+        this._handleClick(aEvent);
+        break;
+      case "DOMPopupBlocked":
+        this._handlePopupBlocked(aEvent);
+        break;
+    }
+  }
+
+  _handleClick(aEvent) {
+    const target = aEvent.composedTarget;
+    const className = ChromeUtils.getClassName(target);
+    if (className !== "HTMLInputElement" && className !== "HTMLSelectElement") {
+      return;
+    }
+
+    if (
+      target.isContentEditable ||
+      target.disabled ||
+      target.readOnly ||
+      !target.willValidate
+    ) {
+      // target.willValidate is false when any associated fieldset is disabled,
+      // in which case this element is treated as disabled per spec.
+      return;
+    }
+
+    if (className === "HTMLSelectElement") {
+      if (!target.isCombobox) {
+        this._handleSelect(target, /* aIsDropDown = */ false);
+        return;
+      }
+      // combobox select is handled by mozshowdropdown.
+      return;
+    }
+
+    const type = target.type;
+    if (type === "month" || type === "week") {
+      // If there's a shadow root, the MozOpenDateTimePicker event takes care
+      // of this. Right now for these input types there's never a shadow root.
+      // Once we support UA widgets for month/week inputs (see bug 888320), we
+      // can remove this.
+      if (!target.openOrClosedShadowRoot) {
+        this._handleDateTime(target);
+        aEvent.preventDefault();
+      }
+    }
+  }
+
+  _generateSelectItems(aElement) {
+    const win = aElement.ownerGlobal;
+    let id = 0;
+    const map = {};
+
+    const items = (function enumList(elem, disabled) {
+      const items = [];
+      const children = elem.children;
+      for (let i = 0; i < children.length; i++) {
+        const child = children[i];
+        if (win.getComputedStyle(child).display === "none") {
+          continue;
+        }
+        const item = {
+          id: String(id),
+          disabled: disabled || child.disabled,
+        };
+        if (win.HTMLOptGroupElement.isInstance(child)) {
+          item.label = child.label;
+          item.items = enumList(child, item.disabled);
+        } else if (win.HTMLOptionElement.isInstance(child)) {
+          item.label = child.label || child.text;
+          item.selected = child.selected;
+        } else {
+          continue;
+        }
+        items.push(item);
+        map[id++] = child;
+      }
+      return items;
+    })(aElement);
+
+    return [items, map, id];
+  }
+
+  _handleSelect(aElement, aIsDropDown) {
+    const win = aElement.ownerGlobal;
+    const [items] = this._generateSelectItems(aElement);
+
+    if (aIsDropDown) {
+      aElement.openInParentProcess = true;
+    }
+
+    const prompt = new lazy.GeckoViewPrompter(win);
+
+    // Something changed the <select> while it was open.
+    const deferredUpdate = new lazy.DeferredTask(() => {
+      // Inner contents in choice prompt are updated.
+      const [newItems] = this._generateSelectItems(aElement);
+      prompt.update({
+        type: "choice",
+        mode: aElement.multiple ? "multiple" : "single",
+        choices: newItems,
+      });
+    }, 0);
+    const mut = new win.MutationObserver(() => {
+      deferredUpdate.arm();
+    });
+    mut.observe(aElement, {
+      childList: true,
+      subtree: true,
+      attributes: true,
+    });
+
+    const dismissPrompt = () => prompt.dismiss();
+    aElement.addEventListener("blur", dismissPrompt, { mozSystemGroup: true });
+    const hidedropdown = event => {
+      if (aElement === event.target) {
+        prompt.dismiss();
+      }
+    };
+    const chromeEventHandler = aElement.ownerGlobal.docShell.chromeEventHandler;
+    chromeEventHandler.addEventListener("mozhidedropdown", hidedropdown, {
+      mozSystemGroup: true,
+    });
+
+    prompt.asyncShowPrompt(
+      {
+        type: "choice",
+        mode: aElement.multiple ? "multiple" : "single",
+        choices: items,
+      },
+      result => {
+        deferredUpdate.disarm();
+        mut.disconnect();
+        aElement.removeEventListener("blur", dismissPrompt, {
+          mozSystemGroup: true,
+        });
+        chromeEventHandler.removeEventListener(
+          "mozhidedropdown",
+          hidedropdown,
+          { mozSystemGroup: true }
+        );
+
+        if (aIsDropDown) {
+          aElement.openInParentProcess = false;
+        }
+        // OK: result
+        // Cancel: !result
+        if (!result || result.choices === undefined) {
+          return;
+        }
+
+        const [, map, id] = this._generateSelectItems(aElement);
+        let dispatchEvents = false;
+        if (!aElement.multiple) {
+          const elem = map[result.choices[0]];
+          if (elem && win.HTMLOptionElement.isInstance(elem)) {
+            dispatchEvents = !elem.selected;
+            elem.selected = true;
+          } else {
+            console.error("Invalid id for select result: " + result.choices[0]);
+          }
+        } else {
+          for (let i = 0; i < id; i++) {
+            const elem = map[i];
+            const index = result.choices.indexOf(String(i));
+            if (
+              win.HTMLOptionElement.isInstance(elem) &&
+              elem.selected !== index >= 0
+            ) {
+              // Current selected is not the same as the new selected state.
+              dispatchEvents = true;
+              elem.selected = !elem.selected;
+            }
+            result.choices[index] = undefined;
+          }
+          for (let i = 0; i < result.choices.length; i++) {
+            if (result.choices[i] !== undefined && result.choices[i] !== null) {
+              console.error(
+                "Invalid id for select result: " + result.choices[i]
+              );
+              break;
+            }
+          }
+        }
+
+        if (dispatchEvents) {
+          this._dispatchEvents(aElement);
+        }
+      }
+    );
+  }
+
+  _handleDateTime(aElement) {
+    const prompt = new lazy.GeckoViewPrompter(aElement.ownerGlobal);
+
+    const chromeEventHandler = aElement.ownerGlobal.docShell.chromeEventHandler;
+    const dismissPrompt = () => prompt.dismiss();
+    // Some controls don't have UA widget (bug 888320)
+    if (
+      ["month", "week"].includes(aElement.type) &&
+      !aElement.openOrClosedShadowRoot
+    ) {
+      aElement.addEventListener("blur", dismissPrompt, {
+        mozSystemGroup: true,
+      });
+    } else {
+      chromeEventHandler.addEventListener(
+        "MozCloseDateTimePicker",
+        dismissPrompt
+      );
+    }
+
+    prompt.asyncShowPrompt(
+      {
+        type: "datetime",
+        mode: aElement.type,
+        value: aElement.value,
+        min: aElement.min,
+        max: aElement.max,
+        step: aElement.step,
+      },
+      result => {
+        // Some controls don't have UA widget (bug 888320)
+        if (
+          ["month", "week"].includes(aElement.type) &&
+          !aElement.openOrClosedShadowRoot
+        ) {
+          aElement.removeEventListener("blur", dismissPrompt, {
+            mozSystemGroup: true,
+          });
+        } else {
+          chromeEventHandler.removeEventListener(
+            "MozCloseDateTimePicker",
+            dismissPrompt
+          );
+        }
+
+        // OK: result
+        // Cancel: !result
+        if (
+          !result ||
+          result.datetime === undefined ||
+          result.datetime === aElement.value
+        ) {
+          return;
+        }
+        aElement.value = result.datetime;
+        this._dispatchEvents(aElement);
+      }
+    );
+  }
+
+  _dispatchEvents(aElement) {
+    // Fire both "input" and "change" events for <select> and <input> for
+    // date/time.
+    aElement.dispatchEvent(
+      new aElement.ownerGlobal.Event("input", { bubbles: true, composed: true })
+    );
+    aElement.dispatchEvent(
+      new aElement.ownerGlobal.Event("change", { bubbles: true })
+    );
+  }
+
+  _handlePopupBlocked(aEvent) {
+    const dwi = aEvent.requestingWindow;
+    const popupWindowURISpec = aEvent.popupWindowURI
+      ? aEvent.popupWindowURI.displaySpec
+      : "about:blank";
+
+    const prompt = new lazy.GeckoViewPrompter(aEvent.requestingWindow);
+    prompt.asyncShowPrompt(
+      {
+        type: "popup",
+        targetUri: popupWindowURISpec,
+      },
+      ({ response }) => {
+        if (response && dwi) {
+          dwi.open(
+            popupWindowURISpec,
+            aEvent.popupWindowName,
+            aEvent.popupWindowFeatures
+          );
+        }
+      }
+    );
+  }
+
+  /* ----------  nsIPromptFactory  ---------- */
+  getPrompt(aDOMWin, aIID) {
+    // Delegated to login manager here, which in turn calls back into us via nsIPromptService.
+    if (aIID.equals(Ci.nsIAuthPrompt2) || aIID.equals(Ci.nsIAuthPrompt)) {
+      try {
+        const pwmgr = Cc[
+          "@mozilla.org/passwordmanager/authpromptfactory;1"
+        ].getService(Ci.nsIPromptFactory);
+        return pwmgr.getPrompt(aDOMWin, aIID);
+      } catch (e) {
+        console.error("Delegation to password manager failed: " + e);
+      }
+    }
+
+    const p = new PromptDelegate(aDOMWin);
+    p.QueryInterface(aIID);
+    return p;
+  }
+
+  /* ----------  private memebers  ---------- */
+
+  // nsIPromptService methods proxy to our Prompt class
+  callProxy(aMethod, aArguments) {
+    const prompt = new PromptDelegate(aArguments[0]);
+    let promptArgs;
+    if (BrowsingContext.isInstance(aArguments[0])) {
+      // Called by BrowsingContext prompt method, strip modalType.
+      [, , /*browsingContext*/ /*modalType*/ ...promptArgs] = aArguments;
+    } else {
+      [, /*domWindow*/ ...promptArgs] = aArguments;
+    }
+    return prompt[aMethod].apply(prompt, promptArgs);
+  }
+
+  /* ----------  nsIPromptService  ---------- */
+
+  alert() {
+    return this.callProxy("alert", arguments);
+  }
+  alertBC() {
+    return this.callProxy("alert", arguments);
+  }
+  alertCheck() {
+    return this.callProxy("alertCheck", arguments);
+  }
+  alertCheckBC() {
+    return this.callProxy("alertCheck", arguments);
+  }
+  confirm() {
+    return this.callProxy("confirm", arguments);
+  }
+  confirmBC() {
+    return this.callProxy("confirm", arguments);
+  }
+  confirmCheck() {
+    return this.callProxy("confirmCheck", arguments);
+  }
+  confirmCheckBC() {
+    return this.callProxy("confirmCheck", arguments);
+  }
+  confirmEx() {
+    return this.callProxy("confirmEx", arguments);
+  }
+  confirmExBC() {
+    return this.callProxy("confirmEx", arguments);
+  }
+  prompt() {
+    return this.callProxy("prompt", arguments);
+  }
+  promptBC() {
+    return this.callProxy("prompt", arguments);
+  }
+  promptUsernameAndPassword() {
+    return this.callProxy("promptUsernameAndPassword", arguments);
+  }
+  promptUsernameAndPasswordBC() {
+    return this.callProxy("promptUsernameAndPassword", arguments);
+  }
+  promptPassword() {
+    return this.callProxy("promptPassword", arguments);
+  }
+  promptPasswordBC() {
+    return this.callProxy("promptPassword", arguments);
+  }
+  select() {
+    return this.callProxy("select", arguments);
+  }
+  selectBC() {
+    return this.callProxy("select", arguments);
+  }
+  promptAuth() {
+    return this.callProxy("promptAuth", arguments);
+  }
+  promptAuthBC() {
+    return this.callProxy("promptAuth", arguments);
+  }
+  asyncPromptAuth() {
+    return this.callProxy("asyncPromptAuth", arguments);
+  }
+}
+
+PromptFactory.prototype.classID = Components.ID(
+  "{076ac188-23c1-4390-aa08-7ef1f78ca5d9}"
+);
+PromptFactory.prototype.QueryInterface = ChromeUtils.generateQI([
+  "nsIPromptFactory",
+  "nsIPromptService",
+]);
+
+class PromptDelegate {
+  constructor(aParent) {
+    this._prompter = new lazy.GeckoViewPrompter(aParent);
+  }
+
+  BUTTON_TYPE_POSITIVE = 0;
+  BUTTON_TYPE_NEUTRAL = 1;
+  BUTTON_TYPE_NEGATIVE = 2;
+
+  /* ---------- internal methods ---------- */
+
+  _addText(aTitle, aText, aMsg) {
+    return Object.assign(aMsg, {
+      title: aTitle,
+      msg: aText,
+    });
+  }
+
+  _addCheck(aCheckMsg, aCheckState, aMsg) {
+    return Object.assign(aMsg, {
+      hasCheck: !!aCheckMsg,
+      checkMsg: aCheckMsg,
+      checkValue: aCheckState && aCheckState.value,
+    });
+  }
+
+  /* ----------  nsIPrompt  ---------- */
+
+  alert(aTitle, aText) {
+    this.alertCheck(aTitle, aText);
+  }
+
+  alertCheck(aTitle, aText, aCheckMsg, aCheckState) {
+    const result = this._prompter.showPrompt(
+      this._addText(
+        aTitle,
+        aText,
+        this._addCheck(aCheckMsg, aCheckState, {
+          type: "alert",
+        })
+      )
+    );
+    if (result && aCheckState) {
+      aCheckState.value = !!result.checkValue;
+    }
+  }
+
+  confirm(aTitle, aText) {
+    // Button 0 is OK.
+    return this.confirmCheck(aTitle, aText);
+  }
+
+  confirmCheck(aTitle, aText, aCheckMsg, aCheckState) {
+    // Button 0 is OK.
+    return (
+      this.confirmEx(
+        aTitle,
+        aText,
+        Ci.nsIPrompt.STD_OK_CANCEL_BUTTONS,
+        /* aButton0 */ null,
+        /* aButton1 */ null,
+        /* aButton2 */ null,
+        aCheckMsg,
+        aCheckState
+      ) == 0
+    );
+  }
+
+  confirmEx(
+    aTitle,
+    aText,
+    aButtonFlags,
+    aButton0,
+    aButton1,
+    aButton2,
+    aCheckMsg,
+    aCheckState
+  ) {
+    const btnMap = Array(3).fill(null);
+    const btnTitle = Array(3).fill(null);
+    const btnCustomTitle = Array(3).fill(null);
+    const savedButtonId = [];
+    for (let i = 0; i < 3; i++) {
+      const btnFlags = aButtonFlags >> (i * 8);
+      switch (btnFlags & 0xff) {
+        case Ci.nsIPrompt.BUTTON_TITLE_OK:
+          btnMap[this.BUTTON_TYPE_POSITIVE] = i;
+          btnTitle[this.BUTTON_TYPE_POSITIVE] = "ok";
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_CANCEL:
+          btnMap[this.BUTTON_TYPE_NEGATIVE] = i;
+          btnTitle[this.BUTTON_TYPE_NEGATIVE] = "cancel";
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_YES:
+          btnMap[this.BUTTON_TYPE_POSITIVE] = i;
+          btnTitle[this.BUTTON_TYPE_POSITIVE] = "yes";
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_NO:
+          btnMap[this.BUTTON_TYPE_NEGATIVE] = i;
+          btnTitle[this.BUTTON_TYPE_NEGATIVE] = "no";
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_IS_STRING:
+          // We don't know if this is positive/negative/neutral, so save for later.
+          savedButtonId.push(i);
+          break;
+        case Ci.nsIPrompt.BUTTON_TITLE_SAVE:
+        case Ci.nsIPrompt.BUTTON_TITLE_DONT_SAVE:
+        case Ci.nsIPrompt.BUTTON_TITLE_REVERT:
+        // Not supported; fall-through.
+        default:
+          break;
+      }
+    }
+
+    // Put saved buttons into available slots.
+    for (let i = 0; i < 3 && savedButtonId.length; i++) {
+      if (btnMap[i] === null) {
+        btnMap[i] = savedButtonId.shift();
+        btnTitle[i] = "custom";
+        btnCustomTitle[i] = [aButton0, aButton1, aButton2][btnMap[i]];
+      }
+    }
+
+    const result = this._prompter.showPrompt(
+      this._addText(
+        aTitle,
+        aText,
+        this._addCheck(aCheckMsg, aCheckState, {
+          type: "button",
+          btnTitle,
+          btnCustomTitle,
+        })
+      )
+    );
+    if (result && aCheckState) {
+      aCheckState.value = !!result.checkValue;
+    }
+    return result && result.button in btnMap ? btnMap[result.button] : -1;
+  }
+
+  prompt(aTitle, aText, aValue, aCheckMsg, aCheckState) {
+    const result = this._prompter.showPrompt(
+      this._addText(
+        aTitle,
+        aText,
+        this._addCheck(aCheckMsg, aCheckState, {
+          type: "text",
+          value: aValue.value,
+        })
+      )
+    );
+    // OK: result && result.text !== undefined
+    // Cancel: result && result.text === undefined
+    // Error: !result
+    if (result && aCheckState) {
+      aCheckState.value = !!result.checkValue;
+    }
+    if (!result || result.text === undefined) {
+      return false;
+    }
+    aValue.value = result.text || "";
+    return true;
+  }
+
+  promptPassword(aTitle, aText, aPassword) {
+    return this._promptUsernameAndPassword(
+      aTitle,
+      aText,
+      /* aUsername */ undefined,
+      aPassword
+    );
+  }
+
+  promptUsernameAndPassword(aTitle, aText, aUsername, aPassword) {
+    const msg = {
+      type: "auth",
+      mode: aUsername ? "auth" : "password",
+      options: {
+        flags: aUsername ? 0 : Ci.nsIAuthInformation.ONLY_PASSWORD,
+        username: aUsername ? aUsername.value : undefined,
+        password: aPassword.value,
+      },
+    };
+    const result = this._prompter.showPrompt(this._addText(aTitle, aText, msg));
+    // OK: result && result.password !== undefined
+    // Cancel: result && result.password === undefined
+    // Error: !result
+    if (!result || result.password === undefined) {
+      return false;
+    }
+    if (aUsername) {
+      aUsername.value = result.username || "";
+    }
+    aPassword.value = result.password || "";
+    return true;
+  }
+
+  select(aTitle, aText, aSelectList, aOutSelection) {
+    const choices = Array.prototype.map.call(aSelectList, (item, index) => ({
+      id: String(index),
+      label: item,
+      disabled: false,
+      selected: false,
+    }));
+    const result = this._prompter.showPrompt(
+      this._addText(aTitle, aText, {
+        type: "choice",
+        mode: "single",
+        choices,
+      })
+    );
+    // OK: result
+    // Cancel: !result
+    if (!result || result.choices === undefined) {
+      return false;
+    }
+    aOutSelection.value = Number(result.choices[0]);
+    return true;
+  }
+
+  _getAuthMsg(aChannel, aLevel, aAuthInfo) {
+    let username;
+    if (
+      aAuthInfo.flags & Ci.nsIAuthInformation.NEED_DOMAIN &&
+      aAuthInfo.domain
+    ) {
+      username = aAuthInfo.domain + "\\" + aAuthInfo.username;
+    } else {
+      username = aAuthInfo.username;
+    }
+    return this._addText(
+      /* title */ null,
+      this._getAuthText(aChannel, aAuthInfo),
+      {
+        type: "auth",
+        mode:
+          aAuthInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD
+            ? "password"
+            : "auth",
+        options: {
+          flags: aAuthInfo.flags,
+          uri: aChannel && aChannel.URI.displaySpec,
+          level: aLevel,
+          username,
+          password: aAuthInfo.password,
+        },
+      }
+    );
+  }
+
+  _fillAuthInfo(aAuthInfo, aResult) {
+    if (!aResult || aResult.password === undefined) {
+      return false;
+    }
+
+    aAuthInfo.password = aResult.password || "";
+    if (aAuthInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD) {
+      return true;
+    }
+
+    const username = aResult.username || "";
+    if (aAuthInfo.flags & Ci.nsIAuthInformation.NEED_DOMAIN) {
+      // Domain is separated from username by a backslash
+      var idx = username.indexOf("\\");
+      if (idx >= 0) {
+        aAuthInfo.domain = username.substring(0, idx);
+        aAuthInfo.username = username.substring(idx + 1);
+        return true;
+      }
+    }
+    aAuthInfo.username = username;
+    return true;
+  }
+
+  promptAuth(aChannel, aLevel, aAuthInfo) {
+    const result = this._prompter.showPrompt(
+      this._getAuthMsg(aChannel, aLevel, aAuthInfo)
+    );
+    // OK: result && result.password !== undefined
+    // Cancel: result && result.password === undefined
+    // Error: !result
+    return this._fillAuthInfo(aAuthInfo, result);
+  }
+
+  async asyncPromptAuth(aChannel, aLevel, aAuthInfo) {
+    const result = await this._prompter.asyncShowPromptPromise(
+      this._getAuthMsg(aChannel, aLevel, aAuthInfo)
+    );
+    // OK: result && result.password !== undefined
+    // Cancel: result && result.password === undefined
+    // Error: !result
+    return this._fillAuthInfo(aAuthInfo, result);
+  }
+
+  _getAuthText(aChannel, aAuthInfo) {
+    const isProxy = aAuthInfo.flags & Ci.nsIAuthInformation.AUTH_PROXY;
+    const isPassOnly = aAuthInfo.flags & Ci.nsIAuthInformation.ONLY_PASSWORD;
+    const isCrossOrig =
+      aAuthInfo.flags & Ci.nsIAuthInformation.CROSS_ORIGIN_SUB_RESOURCE;
+
+    const username = aAuthInfo.username;
+    const authTarget = this._getAuthTarget(aChannel, aAuthInfo);
+    const { displayHost } = authTarget;
+    let { realm } = authTarget;
+
+    // Suppress "the site says: $realm" when we synthesized a missing realm.
+    if (!aAuthInfo.realm && !isProxy) {
+      realm = "";
+    }
+
+    // Trim obnoxiously long realms.
+    if (realm.length > 50) {
+      realm = realm.substring(0, 50) + "\u2026";
+    }
+
+    const bundle = Services.strings.createBundle(
+      "chrome://global/locale/commonDialogs.properties"
+    );
+    let text;
+    if (isProxy) {
+      text = bundle.formatStringFromName("EnterLoginForProxy3", [
+        realm,
+        displayHost,
+      ]);
+    } else if (isPassOnly) {
+      text = bundle.formatStringFromName("EnterPasswordFor", [
+        username,
+        displayHost,
+      ]);
+    } else if (isCrossOrig) {
+      text = bundle.formatStringFromName("EnterUserPasswordForCrossOrigin2", [
+        displayHost,
+      ]);
+    } else if (!realm) {
+      text = bundle.formatStringFromName("EnterUserPasswordFor2", [
+        displayHost,
+      ]);
+    } else {
+      text = bundle.formatStringFromName("EnterLoginForRealm3", [
+        realm,
+        displayHost,
+      ]);
+    }
+
+    return text;
+  }
+
+  _getAuthTarget(aChannel, aAuthInfo) {
+    // If our proxy is demanding authentication, don't use the
+    // channel's actual destination.
+    if (aAuthInfo.flags & Ci.nsIAuthInformation.AUTH_PROXY) {
+      if (!(aChannel instanceof Ci.nsIProxiedChannel)) {
+        throw new Error("proxy auth needs nsIProxiedChannel");
+      }
+      const info = aChannel.proxyInfo;
+      if (!info) {
+        throw new Error("proxy auth needs nsIProxyInfo");
+      }
+      // Proxies don't have a scheme, but we'll use "moz-proxy://"
+      // so that it's more obvious what the login is for.
+      const idnService = Cc["@mozilla.org/network/idn-service;1"].getService(
+        Ci.nsIIDNService
+      );
+      const displayHost =
+        "moz-proxy://" +
+        idnService.convertUTF8toACE(info.host) +
+        ":" +
+        info.port;
+      let realm = aAuthInfo.realm;
+      if (!realm) {
+        realm = displayHost;
+      }
+      return { displayHost, realm };
+    }
+
+    const displayHost =
+      aChannel.URI.scheme + "://" + aChannel.URI.displayHostPort;
+    // If a HTTP WWW-Authenticate header specified a realm, that value
+    // will be available here. If it wasn't set or wasn't HTTP, we'll use
+    // the formatted hostname instead.
+    let realm = aAuthInfo.realm;
+    if (!realm) {
+      realm = displayHost;
+    }
+    return { displayHost, realm };
+  }
+}
+
+PromptDelegate.prototype.QueryInterface = ChromeUtils.generateQI(["nsIPrompt"]);