'img-src' 没有明确设置，所以 'default-src' 被用作后备

Question

这是我在index.html中的Content-Security-Policy

<meta http-equiv="Content-Security-Policy" content="default-src 'self' http://example.com">

现在我将<img id="updateProfilePicPreview" class="profilPicPreview" src="" />的img src动态设置为

  var smallImage = document.getElementById('updateProfilePicPreview');
  smallImage.style.display = 'block';
  smallImage.src = "data:image/jpeg;base64," + imageData;

显示

拒绝加载图像'data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDACgcHiMeGSgjISMtKygw...p+tB/yaKKAIi2TSfjRRVCJFOyIk96rE5NFFDGgoooqBhRRRQA9elIDg5oopgIc+lFFFAH/2Q=='，因为它违反了以下内容安全策略指令： '自我'http://example.com"。请注意，'img-src' 没有显式设置，因此 'default-src' 用作备用。

那么我怎样才能启用动态设置img src 呢？

我是从科尔多瓦页面关注这个例子的：

var pictureSource;   // picture source
var destinationType; // sets the format of returned value

// Wait for device API libraries to load
//
document.addEventListener("deviceready",onDeviceReady,false);

// device APIs are available
//
function onDeviceReady() {
    pictureSource=navigator.camera.PictureSourceType;
    destinationType=navigator.camera.DestinationType;
}

// Called when a photo is successfully retrieved
//
function onPhotoDataSuccess(imageData) {
  // Uncomment to view the base64-encoded image data
  // console.log(imageData);

  // Get image handle
  //
  var smallImage = document.getElementById('smallImage');

  // Unhide image elements
  //
  smallImage.style.display = 'block';

  // Show the captured photo
  // The in-line CSS rules are used to resize the image
  //
  smallImage.src = "data:image/jpeg;base64," + imageData;
}

// Called when a photo is successfully retrieved
//
function onPhotoURISuccess(imageURI) {
  // Uncomment to view the image file URI
  // console.log(imageURI);

  // Get image handle
  //
  var largeImage = document.getElementById('largeImage');

  // Unhide image elements
  //
  largeImage.style.display = 'block';

  // Show the captured photo
  // The in-line CSS rules are used to resize the image
  //
  largeImage.src = imageURI;
}

// A button will call this function
//
function capturePhoto() {
  // Take picture using device camera and retrieve image as base64-encoded string
  navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50,
    destinationType: destinationType.DATA_URL });
}

// A button will call this function
//
function capturePhotoEdit() {
  // Take picture using device camera, allow edit, and retrieve image as base64-encoded string
  navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20, allowEdit: true,
    destinationType: destinationType.DATA_URL });
}

// A button will call this function
//
function getPhoto(source) {
  // Retrieve image file location from specified source
  navigator.camera.getPicture(onPhotoURISuccess, onFail, { quality: 50,
    destinationType: destinationType.FILE_URI,
    sourceType: source });
}

// Called if something bad happens.
//
function onFail(message) {
  alert('Failed because: ' + message);
}

Answer 1

那么如何启用动态设置 img src 呢？

问题不在于设置 src，问题在于将 src 设置为 data: scheme URI。

将data: 添加到content security policy 允许的事物列表中。对于 default-src，或者您可以定义一个单独的 img-src。

在下面的示例中，我在 index.html 文件的元标记开头添加了img-src 'self' data:;。

<meta http-equiv="Content-Security-Policy" content="img-src 'self' data:; default-src 'self' http://XX.XX.XX.XX:8084/mypp/">