move webex specific things in their own directory

1 files changed, 225 insertions, 0 deletions

diff --git a/src/webex/chromeBadge.ts b/src/webex/chromeBadge.ts
new file mode 100644
index 000000000..13add9b3f
--- /dev/null
+++ b/src/webex/chromeBadge.ts
@@ -0,0 +1,225 @@
+/*
+ This file is part of TALER
+ (C) 2016 INRIA
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import {
+  Badge,
+} from "../wallet";
+
+
+/**
+ * Polyfill for requestAnimationFrame, which
+ * doesn't work from a background page.
+ */
+function rAF(cb: (ts: number) => void) {
+  window.setTimeout(() => {
+    cb(performance.now());
+  }, 100 /* 100 ms delay between frames */);
+}
+
+
+/**
+ * Badge for Chrome that renders a Taler logo with a rotating ring if some
+ * background activity is happening.
+ */
+export class ChromeBadge implements Badge {
+  private canvas: HTMLCanvasElement;
+  private ctx: CanvasRenderingContext2D;
+  /**
+   * True if animation running.  The animation
+   * might still be running even if we're not busy anymore,
+   * just to transition to the "normal" state in a animated way.
+   */
+  private animationRunning: boolean = false;
+
+  /**
+   * Is the wallet still busy? Note that we do not stop the
+   * animation immediately when the wallet goes idle, but
+   * instead slowly close the gap.
+   */
+  private isBusy: boolean = false;
+
+  /**
+   * Current rotation angle, ranges from 0 to rotationAngleMax.
+   */
+  private rotationAngle: number = 0;
+
+  /**
+   * While animating, how wide is the current gap in the circle?
+   * Ranges from 0 to openMax.
+   */
+  private gapWidth: number = 0;
+
+  /**
+   * Maximum value for our rotationAngle, corresponds to 2 Pi.
+   */
+  static rotationAngleMax = 1000;
+
+  /**
+   * How fast do we rotate?  Given in rotation angle (relative to rotationAngleMax) per millisecond.
+   */
+  static rotationSpeed = 0.5;
+
+  /**
+   * How fast to we open?  Given in rotation angle (relative to rotationAngleMax) per millisecond.
+   */
+  static openSpeed = 0.15;
+
+  /**
+   * How fast to we close?  Given as a multiplication factor per frame update.
+   */
+  static closeSpeed = 0.7;
+
+  /**
+   * How far do we open? Given relative to rotationAngleMax.
+   */
+  static openMax = 100;
+
+  constructor(window?: Window) {
+    // Allow injecting another window for testing
+    const bg = window || chrome.extension.getBackgroundPage();
+    if (!bg) {
+      throw Error("no window available");
+    }
+    this.canvas = bg.document.createElement("canvas");
+    // Note: changing the width here means changing the font
+    // size in draw() as well!
+    this.canvas.width = 32;
+    this.canvas.height = 32;
+    this.ctx = this.canvas.getContext("2d")!;
+    this.draw();
+  }
+
+  /**
+   * Draw the badge based on the current state.
+   */
+  private draw() {
+    this.ctx.setTransform(1, 0, 0, 1, 0, 0);
+    this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
+
+    this.ctx.translate(this.canvas.width / 2, this.canvas.height / 2);
+
+    this.ctx.beginPath();
+    this.ctx.arc(0, 0, this.canvas.width / 2 - 2, 0, 2 * Math.PI);
+    this.ctx.fillStyle = "white";
+    this.ctx.fill();
+
+    // move into the center, off by 2 for aligning the "T" with the bottom
+    // of the circle.
+    this.ctx.translate(0, 2);
+
+    // pick sans-serif font; note: 14px is based on the 32px width above!
+    this.ctx.font = "bold 24px sans-serif";
+    // draw the "T" perfectly centered (x and y) to the current position
+    this.ctx.textAlign = "center";
+    this.ctx.textBaseline = "middle";
+    this.ctx.fillStyle = "black";
+    this.ctx.fillText("T", 0, 0);
+    // now move really into the center
+    this.ctx.translate(0, -2);
+    // start drawing the (possibly open) circle
+    this.ctx.beginPath();
+    this.ctx.lineWidth = 2.5;
+    if (this.animationRunning) {
+      /* Draw circle around the "T" with an opening of this.gapWidth */
+      const aMax = ChromeBadge.rotationAngleMax;
+      const startAngle = this.rotationAngle / aMax * Math.PI * 2;
+      const stopAngle = ((this.rotationAngle + aMax - this.gapWidth) / aMax) * Math.PI * 2;
+      this.ctx.arc(0, 0, this.canvas.width / 2 - 2, /* radius */ startAngle, stopAngle, false);
+    } else {
+      /* Draw full circle */
+      this.ctx.arc(0, 0,
+                   this.canvas.width / 2 - 2, /* radius */
+                   0,
+                   Math.PI * 2,
+                   false);
+    }
+    this.ctx.stroke();
+    // go back to the origin
+    this.ctx.translate(-this.canvas.width / 2, -this.canvas.height / 2);
+
+    // Allow running outside the extension for testing
+    // tslint:disable-next-line:no-string-literal
+    if (window["chrome"] && window.chrome["browserAction"]) {
+      try {
+        const imageData = this.ctx.getImageData(0,
+                                                0,
+                                                this.canvas.width,
+                                                this.canvas.height);
+        chrome.browserAction.setIcon({imageData});
+      } catch (e) {
+        // Might fail if browser has over-eager canvas fingerprinting countermeasures.
+        // There's nothing we can do then ...
+      }
+    }
+  }
+
+  private animate() {
+    if (this.animationRunning) {
+      return;
+    }
+    this.animationRunning = true;
+    let start: number|undefined;
+    const step = (timestamp: number) => {
+      if (!this.animationRunning) {
+        return;
+      }
+      if (!start) {
+        start = timestamp;
+      }
+      if (!this.isBusy && 0 === this.gapWidth) {
+        // stop if we're close enough to origin
+        this.rotationAngle = 0;
+      } else {
+        this.rotationAngle = (this.rotationAngle + (timestamp - start) *
+                              ChromeBadge.rotationSpeed) % ChromeBadge.rotationAngleMax;
+      }
+      if (this.isBusy) {
+        if (this.gapWidth < ChromeBadge.openMax) {
+          this.gapWidth += ChromeBadge.openSpeed * (timestamp - start);
+        }
+        if (this.gapWidth > ChromeBadge.openMax) {
+          this.gapWidth = ChromeBadge.openMax;
+        }
+      } else {
+        if (this.gapWidth > 0) {
+          this.gapWidth--;
+          this.gapWidth *= ChromeBadge.closeSpeed;
+        }
+      }
+
+      if (this.isBusy || this.gapWidth > 0) {
+        start = timestamp;
+        rAF(step);
+      } else {
+        this.animationRunning = false;
+      }
+      this.draw();
+    };
+    rAF(step);
+  }
+
+  startBusy() {
+    if (this.isBusy) {
+      return;
+    }
+    this.isBusy = true;
+    this.animate();
+  }
+
+  stopBusy() {
+    this.isBusy = false;
+  }
+}